Disclosure of Invention
The invention aims to solve the problem that electric equipment cannot get electricity under the condition of no power supply of an alternating current power supply in the prior art, and provides an electricity getting control method of an electric automobile, so that the electric equipment can safely and conveniently get electricity from a power battery of the electric automobile.
In order to achieve the above object, the technical solution of the present invention is:
an electric automobile power taking control method is based on a vehicle power taking system, and the power taking system comprises: the system comprises a whole vehicle controller VCU, a power battery pack assembly, a bidirectional vehicle-mounted charger OBC and an alternating current charging and discharging interface, wherein a direct current terminal of the bidirectional vehicle-mounted charger OBC is electrically connected with the power battery pack assembly, an alternating current terminal of the bidirectional vehicle-mounted charger OBC3 is electrically connected with the alternating current charging and discharging interface through a high-voltage wire harness, the alternating current charging and discharging interface is in insertion fit with an alternating current power taking gun, and the alternating current charging and discharging interface is electrically connected with electric equipment through the alternating current power taking gun;
and CAN signal interfaces of the whole vehicle controller VCU, the power battery pack assembly and the bidirectional vehicle-mounted charger OBC are all connected with a whole vehicle CAN bus through signals.
The power taking method comprises the following steps:
step one, access signal judgment:
When the equipment is inserted into the alternating current charging and discharging interface, the access equipment enters a power taking flow if the access equipment is an alternating current power taking gun, and enters a charging flow if the access equipment is an alternating current charging gun;
step two, current taking process:
if the equipment connected to the alternating current charging and discharging interface is an alternating current power gun, entering a power taking process, wherein the power taking process comprises the following steps of:
s1, system wakeup and self-checking:
after the OBC detects the power taking signal through the AC charging and discharging interface, the OBC wakes up the vehicle power taking system and completes self-checking, and then enters S2 to control the high voltage on the system;
s2, high-voltage control on a system:
after the bi-directional vehicle-mounted charger OBC detects the electric signal, if the electric signal is normal, the whole vehicle controller VCU sends an upper high-voltage instruction to the power battery pack assembly, the power battery pack assembly receives the upper high-voltage instruction, and meanwhile, the power battery pack assembly detects whether the current state allows the main negative contactor to be attracted or not, and if the current state allows the main negative contactor to be attracted, the main negative contactor in the power battery pack assembly is attracted;
the bidirectional vehicle-mounted charger OBC judges whether the current state allows sending an electricity taking command or not, if so, the bidirectional vehicle-mounted charger OBC sends the electricity taking command to the power battery pack assembly, the power battery pack assembly receives the electricity taking command after the main negative contactor is attracted, then the slow charging contactor in the power battery pack assembly is attracted, the power battery pack assembly starts to discharge to the bidirectional vehicle-mounted charger OBC, and the bidirectional vehicle-mounted charger OBC discharges and outputs to the alternating current electricity taking gun through the alternating current charging and discharging interface;
S3, high-voltage control under a system:
when the bidirectional vehicle-mounted charger OBC discharges and outputs to the alternating current power take-off gun through the alternating current charging and discharging interface, if the current state does not accord with the discharging condition, the bidirectional vehicle-mounted charger OBC stops discharging, and simultaneously the bidirectional vehicle-mounted charger OBC sends a power take-off stopping instruction to the power battery pack assembly and enters a dormant state after the power battery pack assembly stops discharging to the bidirectional vehicle-mounted charger OBC;
the power battery pack assembly receives a power taking termination instruction and then disconnects the slow charging contactor, the power battery pack assembly stops discharging to the bi-directional vehicle-mounted charger OBC, then the VCU sends a high-voltage descending instruction to the power battery pack assembly and enters a dormant state, and the power battery pack assembly disconnects the main negative contactor and enters the dormant state after receiving the high-voltage descending instruction.
In the S1, system awakening and self-checking in the power taking program, the bi-directional vehicle-mounted charger OBC is awakened after detecting the power taking signal through the alternating-current charging and discharging interface, then the bi-directional vehicle-mounted charger OBC sends a VCU awakening signal to the whole vehicle controller VCU and completes self-checking, the whole vehicle controller VCU is awakened and completes self-checking after receiving the VCU awakening signal, then the whole vehicle controller VCU sends a BMS awakening signal to the power battery pack assembly, the power battery pack assembly is awakened and completes self-checking after receiving the BMS awakening signal, and at the moment, the vehicle power taking system is awakened and completes self-checking.
In the S2 in the power-taking procedure and the high-voltage control on the system, the power battery pack assembly detects that the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor are not adhered, and the current state allows the main negative contactor to be attracted;
the power battery pack assembly detects that any relay in the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor is adhered, the main negative contactor is not allowed to be attracted in the current state, and the power battery pack assembly reports faults to the vehicle controller VCU.
In the step S2 of the power taking program and in the system high-voltage control, the flow of sending an upper high-voltage instruction to the power battery pack assembly by the whole vehicle controller VCU1 is as follows:
after the bidirectional vehicle-mounted charger OBC detects the electric taking signal, if the electric taking signal is normal, the bidirectional vehicle-mounted charger OBC sends the electric taking signal to the power battery pack assembly, the power battery pack assembly receives the electric taking signal sent by the bidirectional vehicle-mounted charger OBC, converts the electric taking signal into an alternating current charging signal and forwards the alternating current charging signal to the whole vehicle controller VCU, and the whole vehicle controller VCU receives the alternating current charging signal and then sends a high-voltage instruction to the power battery pack assembly to control the vehicle not to allow driving;
If the power-taking signal is abnormal, the power-taking program is terminated.
An electronic lock is arranged at the joint of the alternating-current charging and discharging interface and the alternating-current charging and discharging gun, the control end of the electronic lock is in signal connection with the control signal output end of the electronic lock of the bi-directional vehicle-mounted charger OBC, and the electronic lock is used for locking the alternating-current charging and discharging gun on the alternating-current charging and discharging interface;
the power-taking control signal input end of the bidirectional vehicle-mounted charger OBC is in signal connection with a power-taking switch through a hard wire;
in the step S2 of the power taking program and in the system high-voltage control, the bi-directional vehicle-mounted charger OBC judges whether the current state allows sending of a power taking instruction or not, and the method comprises the following steps of:
a1, after the electric signal is detected by the bidirectional vehicle-mounted charger OBC, if the electric signal is normal, the bidirectional vehicle-mounted charger OBC controls the electronic lock to be closed, if the electronic lock is successfully closed, the next step is carried out, and if the electronic lock is not successfully closed, the bidirectional vehicle-mounted charger OBC delays for 500ms and then reports the electronic lock fault to the vehicle control unit VCU;
a2, after the electronic lock is successfully closed, if the condition that the power taking switch is opened and the allowable discharging current of the power battery pack assembly is more than 30A is met, the bidirectional vehicle-mounted charger OBC3 judges that the current state allows sending a power taking instruction;
If the power taking switch is not started or the allowable discharging current of the power battery pack assembly is smaller than or equal to 30A, the OBC judges that the current state does not allow the power taking instruction to be sent, the OBC3 controls the electronic lock to unlock after 3 minutes of timeout, meanwhile, the OBC stops sending the VCU wake-up signal to the VCU, and then the OBC delays for 2S to enter the dormant state.
In the S2 in the power taking program and in the system high-voltage control, when the power battery pack assembly receives a power taking instruction and closes the slow charging contactor, if the slow charging contactor is not closed after 3 seconds are overtime, the power battery pack assembly reports the suction failure of the slow charging contactor to the whole vehicle controller VCU 1;
and after the slow charging contactor is closed and the power battery pack assembly starts to discharge to the bidirectional vehicle-mounted charger OBC, the bidirectional vehicle-mounted charger OBC detects whether the input voltage is normal, if the input voltage is normal, the bidirectional vehicle-mounted charger OBC discharges and outputs to the alternating current power taking gun through the alternating current charging and discharging interface, and if the input voltage is abnormal, the bidirectional vehicle-mounted charger OBC reports the abnormal voltage to the whole vehicle controller VCU after overtime for 3 seconds.
In the step S3 of the power-taking program and the system low-voltage control, the fact that the current state does not accord with the discharge condition means that any one of the following conditions exists:
a. The power taking switch is not turned on;
b. the VCU of the whole vehicle controller sends out a low-high-voltage instruction;
c. serious faults occur in the OBC of the bidirectional vehicle-mounted charger;
d. the allowable discharge current of the power battery pack assembly is less than or equal to 30A.
In the step S3 of the power taking program and in the system low-voltage control, the bi-directional vehicle-mounted charger OBC stops sending a VCU wake-up signal to the whole vehicle controller VCU and enters a sleep state, and the method comprises the following steps of:
after the bi-directional vehicle-mounted charger OBC sends a power taking termination instruction to the power battery pack assembly, the bi-directional vehicle-mounted charger OBC detects whether the power battery pack assembly stops discharging or not:
when the power battery pack assembly stops discharging, the bidirectional vehicle-mounted charger OBC controls the electronic lock to unlock after the power battery pack assembly stops discharging, the bidirectional vehicle-mounted charger OBC stops sending the VCU wake-up signal to the whole vehicle controller VCU1 after the electronic lock is unlocked, and the bidirectional vehicle-mounted charger OBC enters a dormant state after stopping sending the VCU wake-up signal 2s to the whole vehicle controller VCU;
when the power battery pack assembly does not stop discharging, the bidirectional vehicle-mounted charger OBC controls the electronic lock to unlock after 3 seconds of timeout, the bidirectional vehicle-mounted charger OBC stops sending the VCU wake-up signal to the vehicle controller VCU after the electronic lock is unlocked, and the bidirectional vehicle-mounted charger OBC enters a dormant state after stopping sending the VCU wake-up signal to the vehicle controller VCU for 2 seconds;
And in the step S3 of the power taking program and in the system low-voltage control, when the power battery pack assembly receives a power taking termination instruction and controls the slow charging contactor to be disconnected, if the slow charging contactor fails to be disconnected successfully, reporting a disconnection fault of the slow charging contactor to the vehicle controller VCU by the power battery pack assembly after 3 seconds of timeout.
The alternating current power taking gun is internally provided with a first resistor and a power taking confirmation resistor, the shell of the alternating current power taking gun is provided with a connection confirmation switch, one end of the first resistor is connected with the grounding end of the alternating current power taking gun, the other end of the first resistor is connected with one end of the power taking confirmation resistor, the other end of the power taking confirmation resistor is connected with the power taking confirmation interface end of the alternating current power taking gun, and the connection confirmation switch is connected with the first resistor in parallel;
after the alternating current power taking gun is inserted into the alternating current charging and discharging interface, a power taking confirmation interface end on the alternating current power taking gun is connected with a charging and discharging connection confirmation interface end on the alternating current charging and discharging interface, and a grounding end on the alternating current power taking gun is connected with a vehicle body grounding interface end on the alternating current charging and discharging interface;
in the S1, system awakening and self-checking in the power-taking program, the bi-directional vehicle-mounted charger OBC detects a power-taking signal on a charging and discharging connection confirmation interface end through an alternating-current charging and discharging interface;
In the step S2 of the power taking program and the high-voltage control on the system, the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface end and the vehicle body ground interface end on the alternating-current charging and discharging interface is equal to the resistance of the power taking confirmation resistor.
The resistance value of the power-taking confirmation resistor is 2KΩ;
and step two, in S2 in the power taking program and in the high-voltage control on the system, the bi-directional vehicle-mounted charger OBC detects that the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface end on the alternating-current charging and discharging interface and the vehicle body ground interface end is 2KΩ.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the power taking control method of the electric automobile, the bidirectional vehicle-mounted charger OBC is directly connected with the power battery pack assembly, when the access equipment is an alternating current power taking gun, the bidirectional vehicle-mounted charger OBC automatically wakes up and completes self-checking after detecting a power taking signal through the alternating current charging and discharging interface, and the vehicle is not required to be started; and the bi-directional vehicle-mounted charger OBC3 detects that the electric pickup signal is normal and then sends the electric pickup signal to the power battery pack assembly, the power battery pack assembly converts the electric pickup signal into an alternating current charging signal and forwards the alternating current charging signal to the whole vehicle controller VCU, and the whole vehicle controller VCU receives the alternating current charging signal and then controls the vehicle to not allow driving, so that the electric pickup safety is ensured. Therefore, in the design, the system is automatically awakened after the alternating-current charging and discharging gun is connected, and electricity can be taken without starting a vehicle; meanwhile, the whole vehicle controller VCU does not allow the vehicle to run in the power taking process, so that the power taking safety is ensured.
2. The power battery pack assembly in the power-taking control method of the electric automobile only allows the main negative contactor to be attracted under the condition that the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor are detected; the method comprises the steps that an on-board bidirectional charger OBC sends an electricity taking instruction to a power battery pack assembly under the conditions that an electronic lock is closed and has no fault, an electricity taking switch is opened, and a discharge current allowed by the power battery pack assembly is larger than 30A, and then a slow charging contactor is closed to enable the power battery pack assembly to discharge to the on-board bidirectional charger OBC; after the power battery pack assembly starts to discharge to the bidirectional vehicle-mounted charger OBC, the bidirectional vehicle-mounted charger OBC discharges and outputs the power to the alternating current power taking gun through the alternating current charging and discharging interface under the condition that the input voltage is normal, and the power taking safety is ensured. Therefore, in the design, the bi-directional vehicle-mounted charger OBC discharges electricity to output only under the condition that the safety setting condition is met, and electricity taking safety is ensured.
3. The power battery pack assembly directly discharges and outputs to the alternating current power taking gun through the bi-directional vehicle-mounted charger OBC by utilizing the characteristic that the bi-directional vehicle-mounted charger OBC can convert direct current of the power battery into alternating current in the power taking control method of the electric automobile. Therefore, the charging system architecture of the electric automobile is fully utilized, power can be taken without adding additional conversion equipment, the power taking is safe and convenient, the power demand of consumers is met, and the use scene of the electric automobile is expanded.
4. According to the power taking control method of the electric automobile, the bi-directional vehicle-mounted charger OBC detects the power taking signal on the charging and discharging connection confirmation interface through the alternating-current charging and discharging interface, when the resistance between the charging and discharging connection confirmation interface CC on the alternating-current charging and discharging interface and the PE interface on the alternating-current charging and discharging interface is equal to the resistance of the power taking confirmation resistor, the bi-directional vehicle-mounted charger OBC detects that the power taking signal is normal, so that the power taking signal can be controlled by controlling the on-off of the connection confirmation switch S3 on the alternating-current power taking gun, and further charging is controlled after the alternating-current power taking gun is inserted into the alternating-current charging and discharging interface. Therefore, in the present design, the charge can be controlled by controlling the power supply signal with the connection confirmation switch S3.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 4, an electricity taking control method of an electric automobile, the electricity taking control method is based on a vehicle electricity taking system, the electricity taking system includes: the vehicle-mounted electric power charging and discharging device comprises a whole vehicle controller VCU1, a power battery pack assembly 2, a bidirectional vehicle-mounted charger OBC3 and an alternating current charging and discharging interface 5, wherein a direct current terminal of the bidirectional vehicle-mounted charger OBC3 is electrically connected with the power battery pack assembly 2, an alternating current terminal of the bidirectional vehicle-mounted charger OBC3 is electrically connected with the alternating current charging and discharging interface 5 through a high-voltage wire harness, the alternating current charging and discharging interface 5 is in insertion fit with an alternating current power charging gun 6, and the alternating current charging and discharging interface 5 is electrically connected with electric equipment 8 through the alternating current power charging gun 6;
and CAN signal interfaces of the whole vehicle controller VCU1, the power battery pack assembly 2 and the bidirectional vehicle-mounted charger OBC3 are all connected with a whole vehicle CAN bus through signals.
The power taking method comprises the following steps:
step one, access signal judgment:
when equipment is inserted into the alternating current charging and discharging interface 5, if the access equipment is an alternating current power-taking gun 6, entering a power-taking flow, and if the access equipment is an alternating current charging gun, entering a charging flow;
Step two, current taking process:
if the equipment connected to the AC charging and discharging interface 5 is an AC power gun 6, a current taking process is started, and the current taking process comprises the following steps:
s1, system wakeup and self-checking:
after the OBC3 detects the power-taking signal through the AC charging and discharging interface 5, the vehicle power-taking system is awakened and self-checking is completed, and then S2 is carried out, and high-voltage control is carried out on the system;
s2, high-voltage control on a system:
after the bi-directional vehicle-mounted charger OBC3 detects an electric signal, if the electric signal is normal, the whole vehicle controller VCU1 sends an upper high-voltage instruction to the power battery pack assembly 2, the power battery pack assembly 2 receives the upper high-voltage instruction, meanwhile, the power battery pack assembly 2 detects whether the current state allows the main negative contactor to be attracted, and if so, the main negative contactor in the power battery pack assembly 2 is attracted;
the bidirectional vehicle-mounted charger OBC3 judges whether the current state allows sending an electricity taking instruction, if so, the bidirectional vehicle-mounted charger OBC3 sends the electricity taking instruction to the power battery pack assembly 2, after the main negative contactor is attracted, the power battery pack assembly 2 receives the electricity taking instruction, then the slow charging contactor in the power battery pack assembly 2 is attracted, the power battery pack assembly 2 starts to discharge to the bidirectional vehicle-mounted charger OBC3, and the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current electricity taking gun 6 through the alternating current charging and discharging interface 5;
S3, high-voltage control under a system:
when the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current power taking gun 6 through the alternating current charging and discharging interface 5, if the current state does not meet the discharging condition, the bidirectional vehicle-mounted charger OBC3 stops discharging and sends a power taking termination instruction to the power battery pack assembly 2, and then the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1 and enters a dormant state;
after the bi-directional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1, the whole vehicle controller VCU1 sends a high-voltage down instruction to the power battery pack assembly 2, and then the whole vehicle controller VCU1 enters a dormant state;
the power battery pack assembly 2 is disconnected with the slow charging contactor after receiving the power taking termination instruction, the power battery pack assembly 2 stops discharging to the bi-directional vehicle-mounted charger OBC3, and the power battery pack assembly 2 is disconnected with the main negative contactor and enters a dormant state after receiving the high-voltage down instruction.
In the step two, in the S1, system awakening and self-checking in the power taking program, the bidirectional vehicle-mounted charger OBC3 is awakened after detecting the power taking signal through the alternating current charging and discharging interface 5, then the bidirectional vehicle-mounted charger OBC3 completes self-checking and sends a VCU awakening signal to the whole vehicle controller VCU1, the whole vehicle controller VCU1 is awakened and completes self-checking after receiving the VCU awakening signal, then the whole vehicle controller VCU1 sends a BMS awakening signal to the power battery pack assembly 2, the power battery pack assembly 2 is awakened and completes self-checking after receiving the BMS awakening signal, and at the moment, the vehicle power taking system is awakened and completes self-checking.
In the step S2 in the power taking program and in the system high-voltage control, the flow of sending the high-voltage instruction to the power battery pack assembly 2 by the whole vehicle controller VCU1 is as follows:
after the bidirectional vehicle-mounted charger OBC3 detects the electric taking signal, if the electric taking signal is normal, the bidirectional vehicle-mounted charger OBC3 sends the electric taking signal to the power battery pack assembly 2, the power battery pack assembly 2 receives the electric taking signal sent by the bidirectional vehicle-mounted charger OBC3, converts the electric taking signal into an alternating current charging signal and then forwards the alternating current charging signal to the whole vehicle controller VCU1, and the whole vehicle controller VCU1 sends an upper high voltage instruction to the power battery pack assembly 2 after receiving the alternating current charging signal and controls the vehicle not to allow driving;
if the power-taking signal is abnormal, the power-taking program is terminated.
In the step S2 of the power taking program and the system high-voltage control, the power battery pack assembly 2 detects that the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor are not adhered, and the current state allows the main negative contactor to be attracted;
the power battery pack assembly 2 detects that any contactor of the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor is adhered, the main negative contactor is not allowed to be attracted in the current state, and the power battery pack assembly 2 reports faults to the vehicle control unit VCU 1.
An electronic lock 7 is arranged at the joint of the alternating-current charging and discharging interface 5 and the alternating-current power taking gun 6, the control end of the electronic lock 7 is in signal connection with the control signal output end of the electronic lock of the bidirectional vehicle-mounted charger OBC3, and the electronic lock 7 is used for locking the alternating-current power taking gun 6 inserted into the alternating-current charging and discharging interface 5;
the power taking control signal input end of the bidirectional vehicle-mounted charger OBC3 is in signal connection with a power taking switch 4 through a hard wire, and the power taking switch 4 is used for controlling power taking;
in the step S2 of the power taking program and in the system high-voltage control, the bi-directional vehicle-mounted charger OBC3 judges whether the current state allows the power taking instruction to be sent or not, and the method comprises the following steps of:
a1, after the electric signal is detected by the bidirectional vehicle-mounted charger OBC3, if the electric signal is normal, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to be closed, if the electronic lock is successfully closed, the next step is carried out, and if the electronic lock is not successfully closed, the bidirectional vehicle-mounted charger OBC3 delays for 500ms and then reports the electronic lock fault to the whole vehicle controller VCU 1;
a2, after the electronic lock is successfully closed, if the power taking switch 4 is opened and the allowable discharge current of the power battery pack assembly 2 is more than 30A, the bidirectional vehicle-mounted charger OBC3 judges that the current state allows sending a power taking instruction;
if the power taking switch 4 is not opened or the allowable discharging current of the power battery pack assembly 2 is less than or equal to 30A at this time, the OBC3 judges that the current state does not allow sending of the power taking instruction, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after 3 minutes of timeout, meanwhile, the bidirectional vehicle-mounted charger OBC3 stops sending of the VCU wake-up signal to the whole vehicle controller VCU1, and then the bidirectional vehicle-mounted charger OBC3 delays 2S to enter the dormant state.
In the step 2 of the power taking program and in the system high-voltage control, when the power battery pack assembly 2 receives a power taking instruction and closes the slow charging contactor, if the slow charging contactor is not completed to be attracted after 3 seconds are overtime, the power battery pack assembly 2 reports the attraction fault of the slow charging contactor to the whole vehicle controller VCU 1;
after the slow charging contactor is closed, the power battery pack assembly 2 starts to discharge to the bidirectional vehicle-mounted charger OBC3, the bidirectional vehicle-mounted charger OBC3 detects whether the discharge voltage of the power battery pack assembly 2 is normal, if the discharge voltage of the power battery pack assembly 2 is normal, the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current power supply gun 6 through the alternating current charging and discharging interface 5, and if the discharge voltage of the power battery pack assembly 2 is abnormal, the bidirectional vehicle-mounted charger OBC3 reports abnormal voltage to the whole vehicle controller VCU1 after 3 seconds.
In the step S3 of the power-taking program and the system low-voltage control, the fact that the current state does not accord with the discharge condition means that any one of the following conditions exists:
a. the power taking switch 4 is not turned on;
b. the whole vehicle controller VCU1 sends out a low-high-voltage instruction;
c. serious faults occur in the OBC3 of the bidirectional vehicle-mounted charger;
d. the allowable discharge current of the power battery pack assembly 2 is 30A or less.
In the step S3 of the power taking program and in the system low-voltage control, the bi-directional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1 and enters a sleep state, and the method comprises the following steps of:
after the bidirectional vehicle-mounted charger OBC3 sends a power taking termination instruction to the power battery pack assembly 2, the bidirectional vehicle-mounted charger OBC3 detects whether the power battery pack assembly 2 stops discharging or not:
when the power battery pack assembly 2 stops discharging, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after the power battery pack assembly 2 stops discharging, the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1 after the electronic lock 7 is unlocked, and the bidirectional vehicle-mounted charger OBC3 enters a dormant state after stopping sending the VCU wake-up signal 2s to the whole vehicle controller VCU 1;
when the power battery pack assembly 2 does not stop discharging, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after 3s overtime, the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1 after the electronic lock 7 is unlocked, and the bidirectional vehicle-mounted charger OBC3 enters a dormant state after stopping sending the VCU wake-up signal to the whole vehicle controller VCU1 for 2 s;
in the step S3 of the power taking procedure and in the system down high voltage control, when the power battery pack assembly 2 receives the instruction of stopping power taking and controls the slow charging contactor to be disconnected, if the slow charging contactor fails to be disconnected successfully, the power battery pack assembly 2 reports the disconnection fault of the slow charging contactor to the whole vehicle controller VCU1 after 3S of timeout.
The alternating current power taking gun 6 is internally provided with a first resistor R1 and a power taking confirmation resistor R2, the shell of the alternating current power taking gun 6 is provided with a connection confirmation switch S3, one end of the first resistor R1 is connected with a grounding end 61 on the alternating current power taking gun 6, the other end of the first resistor R1 is connected with one end of the power taking confirmation resistor R2, the other end of the power taking confirmation resistor R2 is connected with a power taking confirmation interface end 62 on the alternating current power taking gun 6, and the connection confirmation switch S3 is connected with the first resistor R1 in parallel;
after the alternating current power taking gun 6 is inserted into the alternating current charging and discharging interface 5, a power taking confirmation interface end 62 on the alternating current power taking gun 6 is connected with a charging and discharging connection confirmation interface end CC on the alternating current charging and discharging interface 5, and a grounding end 61 on the alternating current power taking gun 6 is connected with a vehicle body ground interface end PE on the alternating current charging and discharging interface 5;
in the step S1, system wake-up and self-check in the power-up procedure, the bi-directional vehicle-mounted charger OBC3 detects the power-up signal on the charge-discharge connection confirmation interface end CC through the alternating-current charge-discharge interface 5;
in the step S2 of the power taking procedure and the on-system high voltage control, the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface CC and the vehicle body ground interface PE on the ac charging and discharging interface 5 is equal to the resistance of the power taking confirmation resistor R2.
The resistance value of the power taking confirmation resistor R2 is 2KΩ;
in the step S2 of the power taking procedure and in the high-voltage control on the system, the bi-directional vehicle-mounted charger OBC3 detects that the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface end CC on the alternating-current charging and discharging interface 5 and the vehicle body ground interface end PE is 2KΩ.
The principle of the invention is explained as follows:
the bidirectional vehicle-mounted charger OBC can work positively to realize AC-DC, convert the power grid alternating current into direct current to charge the power battery of the electric vehicle, and also can work reversely to realize DC-AC, and invert the electric energy of the power battery pack into household alternating current; when the electric automobile is in a charging process, the bidirectional vehicle-mounted charger OBC works forward, and when the electric automobile is in a power taking process, the bidirectional vehicle-mounted charger OBC works reversely.
The power battery assembly 2 comprises a power battery, a battery management system BMS and contactors controlled by the battery management system BMS, such as a main negative contactor, a slow charging contactor, a main driving contactor, an auxiliary driving contactor, a fast charging contactor and the like, and after the power battery pack assembly 2 receives a BMS wake-up signal, the battery management system BMS inside the power battery pack assembly 2 is waken up to complete self-checking, namely the power battery pack assembly 2 is waken up and completes self-checking.
The alternating current charging and discharging interface 5 can be inserted with an alternating current power taking gun 6 or an alternating current charging gun, and the bidirectional vehicle-mounted charger OBC3 judges that the inserting device is the alternating current power taking gun 6 or the charging gun through a signal received by the charging and discharging connection confirmation interface CC in the alternating current charging and discharging interface 5.
The electronic lock 7 is used for locking the alternating current charging and discharging interface 5 and the alternating current power taking gun 6, so that the alternating current power taking gun 6 is prevented from falling out of the alternating current charging and discharging interface 5 in the power taking process; the electronic lock 7 can also be used for locking the alternating current charging and discharging interface 5 and the charging gun.
The power battery pack assembly 2 is awakened after receiving the BMS awakening signal and completes self-checking, the power battery pack assembly 2 is awakened, the power battery pack assembly 2 completes self-checking to mean that the power battery pack assembly 2 is successful in self-checking and the power battery pack assembly 2 does not need to have a high-voltage fault, if the power battery pack assembly 2 has the high-voltage fault, the self-checking is unsuccessful, the power taking program is terminated at the moment, and meanwhile, the power battery pack assembly 2 reports the fault to the vehicle controller VCU 1.
When the slow charging contactor or the main negative contactor is disconnected, the power battery in the power battery pack assembly 2 is disconnected with the bidirectional vehicle-mounted charger OBC3, the power battery pack assembly 2 does not discharge to the bidirectional vehicle-mounted charger OBC3, when the slow charging contactor and the main negative contactor are in a closed state, the power battery in the power battery pack assembly 2 is electrically connected with the bidirectional vehicle-mounted charger OBC, the power battery pack assembly 2 outputs direct current to the bidirectional vehicle-mounted charger OBC, and the bidirectional vehicle-mounted charger OBC inverts the direct current output by the power battery into alternating current and then provides the alternating current to the electric equipment 8 through the alternating current charging and discharging interface 5.
After the power battery pack assembly 2 starts to discharge to the bidirectional vehicle-mounted charger OBC3, as the power battery in the power battery pack assembly 2 is electrically connected with the bidirectional vehicle-mounted charger OBC3, the bidirectional vehicle-mounted charger OBC3 detects whether the input voltage from the power battery is normal or not, if the input voltage is normal, the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current power taking gun 6 through the alternating current charging and discharging interface 5, and if the input voltage is abnormal, the bidirectional vehicle-mounted charger OBC3 reports the abnormal voltage to the whole vehicle controller VCU1 after 3 seconds of overtime.
The power battery pack assembly 2 allows discharging current, namely maximum discharging current allowed by the power battery system in real time currently; the power battery pack assembly 2 can obtain the allowable discharge current of the current power battery pack assembly 2 according to the current SOC (state of charge) and the battery core temperature.
The electronic lock 7 is used for locking the alternating-current charge-discharge interface 5 and the alternating-current power taking gun 6, and when the electronic lock 7 is closed, the alternating-current charge-discharge interface 5 and the alternating-current power taking gun 6 are locked; when the electronic lock 7 is unlocked, the alternating current power supply gun 6 can be pulled out of the alternating current charging and discharging interface 5.
The connection confirmation switch S3 is used for determining the connection state of the ac charging/discharging interface 5 and the ac power take-off gun 6.
When the charging gun is inserted into the alternating-current charging and discharging interface 5, the charging and discharging connection confirmation interface end CC receives a charging signal, when the alternating-current power taking gun 6 is inserted into the alternating-current charging and discharging interface 5, the charging and discharging connection confirmation interface end CC receives a power taking signal, and when the power taking signal meets a certain condition, the power taking signal is effective.
Example 1:
an electric automobile power taking control method is based on a vehicle power taking system, and the power taking system comprises: the vehicle-mounted electric power charging and discharging system comprises a whole vehicle controller VCU1, a power battery pack assembly 2, a bidirectional vehicle-mounted charger OBC3 and an alternating current charging and discharging interface 5, wherein a direct current terminal of the bidirectional vehicle-mounted charger OBC3 is electrically connected with the power battery pack assembly 2, an alternating current terminal of the bidirectional vehicle-mounted charger OBC3 is electrically connected with the alternating current charging and discharging interface 5 through a high-voltage wire harness, the alternating current charging and discharging interface 5 is in insertion fit with an alternating current power charging and discharging gun 6, the alternating current charging and discharging interface 5 is electrically connected with an electric device 8 through the alternating current power charging and discharging gun 6, an electronic lock 7 is arranged at the joint of the alternating current charging and discharging interface 5 and the alternating current power charging and discharging gun 6, and the electronic lock 7 is used for locking the alternating current power charging and discharging gun 6 on the alternating current charging and discharging interface 5;
the control system comprises a whole vehicle controller VCU1, a power battery pack assembly 2 and a CAN signal interface of a bidirectional vehicle-mounted charger OBC3, wherein the CAN signal interfaces of the whole vehicle controller VCU1, the power battery pack assembly 2 and the bidirectional vehicle-mounted charger OBC3 are connected with a whole vehicle CAN bus signal, an electricity taking control signal input end of the bidirectional vehicle-mounted charger OBC3 is connected with an electricity taking switch 4 through a hard wire, and a control end of an electronic lock 7 is connected with an electronic lock control signal output of the bidirectional vehicle-mounted charger OBC 3.
The power taking method comprises the following steps:
step one, access signal judgment:
when equipment is inserted into the alternating current charging and discharging interface 5, if the access equipment is an alternating current power-taking gun 6, entering a power-taking flow, and if the access equipment is an alternating current charging gun, entering a charging flow;
step two, current taking process:
if the equipment connected to the AC charging and discharging interface 5 is an AC power gun 6, a current taking process is started, and the current taking process comprises the following steps:
s1, system wakeup and self-checking:
because the ac power taking gun 6 is inserted into the ac charging and discharging interface 5, the bi-directional vehicle-mounted charger OBC3 detects a power taking signal (i.e., the CC3 signal in fig. 2) through the ac charging and discharging interface 5, and the vehicle power taking system wakes up and completes self-checking according to the following procedures: the bidirectional vehicle-mounted charger OBC3 is wakened after detecting an electric taking signal through the alternating current charging and discharging interface 5, then the bidirectional vehicle-mounted charger OBC3 completes self-checking and sends a VCU wake-up signal to the vehicle controller VCU1, the vehicle controller VCU1 is wakened and completes self-checking after receiving the VCU wake-up signal, then the vehicle controller VCU1 sends a BMS wake-up signal to the power battery pack assembly 2, the power battery pack assembly 2 is wakened and completes self-checking after receiving the BMS wake-up signal, at the moment, the vehicle power taking system is wakened and completes self-checking, and then S2 and on-system high-voltage control are entered.
S2, high-voltage control on a system:
after the bidirectional vehicle-mounted charger OBC3 detects the electric taking signal, if the electric taking signal is normal, the bidirectional vehicle-mounted charger OBC3 sends the electric taking signal to the power battery pack assembly 2, the power battery pack assembly 2 receives the electric taking signal sent by the bidirectional vehicle-mounted charger OBC3, converts the electric taking signal into an alternating current charging signal and then forwards the alternating current charging signal to the whole vehicle controller VCU1, and the whole vehicle controller VCU1 sends an upper high voltage instruction to the power battery pack assembly 2 after receiving the alternating current charging signal and controls the vehicle not to allow driving;
if the power-taking signal is abnormal, the power-taking program is terminated.
After the power battery pack assembly 2 receives the high-voltage instruction, the power battery pack assembly 2 detects whether the current state allows the main negative contactor to be attracted or not: if the main negative contactor, the main driving contactor, the auxiliary driving contactor, the quick charging contactor and the slow charging contactor are not adhered, the main negative contactor is allowed to be attracted in the current state, and the main negative contactor is attracted at the moment;
if any one of the main negative contactor, the main drive contactor, the auxiliary drive contactor, the quick charge contactor and the slow charge contactor is adhered at the moment, the main negative contactor is not allowed to be attracted in the current state, and the power battery pack assembly 2 reports a fault to the whole vehicle controller VCU1 at the moment;
Meanwhile, after the bidirectional vehicle-mounted charger OBC3 detects a normal power-taking signal, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to be closed, if the electronic lock is not closed successfully, the bidirectional vehicle-mounted charger OBC3 delays for 500ms and then reports the fault of the electronic lock to the vehicle controller VCU1, and if the electronic lock is closed successfully, the next step is entered:
after the electronic lock is successfully closed, if the power taking switch 4 is opened and the discharge current allowed by the power battery pack assembly 2 is more than 30A, the bidirectional vehicle-mounted charger OBC3 sends a power taking instruction to the power battery pack assembly 2; if the power taking switch 4 is not started at this time or the allowable discharging current of the power battery pack assembly 2 is less than or equal to 30A, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after 3 minutes of timeout, meanwhile, the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1, and then the bidirectional vehicle-mounted charger OBC3 delays for 2S to enter a dormant state;
after the power battery pack assembly 2 receives an electricity taking instruction sent by the bi-directional vehicle-mounted charger OBC3 after the main negative contactor is attracted, the power battery pack assembly 2 controls the attraction of the slow charging contactor in the power battery pack assembly 2, and if the slow charging contactor is not closed after 3 seconds of overtime, the power battery pack assembly 2 reports the attraction failure of the slow charging contactor to the vehicle controller VCU 1;
If the slow charging contactor is successful in suction, the power battery pack assembly 2 starts to discharge to the bidirectional vehicle-mounted charger OBC3, at the moment, the bidirectional vehicle-mounted charger OBC3 detects whether the discharge voltage of the power battery pack assembly 2 is normal, if the discharge voltage of the power battery pack assembly 2 is normal, the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current power supply gun 6 through the alternating current charging and discharging interface 5, and if the discharge voltage of the power battery pack assembly 2 is abnormal, the bidirectional vehicle-mounted charger OBC3 reports abnormal voltage to the whole vehicle controller VCU1 after 3s is overtime.
S3, high-voltage control under a system:
when the bidirectional vehicle-mounted charger OBC3 discharges and outputs to the alternating current power taking gun 6 through the alternating current charging and discharging interface 5, if any one of the following conditions exists, the current state does not accord with the discharging condition:
a. the power taking switch 4 is not turned on;
b. the whole vehicle controller VCU1 sends out a low-high-voltage instruction;
c. serious faults occur in the OBC3 of the bidirectional vehicle-mounted charger;
d. the allowable discharge current of the power battery pack assembly 2 is less than or equal to 30A;
the serious fault inside the OBC3 of the bidirectional vehicle-mounted charger means that a hardware fault or a communication loss fault occurs inside the OBC.
If the current state does not accord with the discharging condition, the bidirectional vehicle-mounted charger OBC3 stops discharging, meanwhile, the bidirectional vehicle-mounted charger OBC3 sends a power taking stopping instruction to the power battery pack assembly 2, the power battery pack assembly 2 receives the power taking stopping instruction and then disconnects the slow charging contactor, the power battery pack assembly 2 stops discharging to the bidirectional vehicle-mounted charger OBC3, if the slow charging contactor fails to disconnect at the moment, the power battery pack assembly 2 reports a disconnection fault of the slow charging contactor to the vehicle controller VCU1 after 3 seconds of time-out;
After the bidirectional vehicle-mounted charger OBC3 sends a power taking termination instruction to the power battery pack assembly 2, the bidirectional vehicle-mounted charger OBC3 detects whether the power battery pack assembly 2 stops discharging or not:
when the slow charging contactor is normally disconnected, and the power battery pack assembly 2 stops discharging, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after the power battery pack assembly 2 stops discharging, the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the vehicle controller VCU1 after the electronic lock 7 is unlocked, and the bidirectional vehicle-mounted charger OBC3 enters a dormant state after stopping sending the VCU wake-up signal 2s to the vehicle controller VCU 1;
when the slow charging contactor fails to be normally disconnected, the power battery pack assembly 2 does not stop discharging, the bidirectional vehicle-mounted charger OBC3 controls the electronic lock 7 to unlock after 3s overtime, the bidirectional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the vehicle controller VCU1 after the electronic lock 7 is unlocked, and the bidirectional vehicle-mounted charger OBC3 enters a dormant state after stopping sending the VCU wake-up signal to the vehicle controller VCU1 for 2 s;
after the bi-directional vehicle-mounted charger OBC3 stops sending a VCU wake-up signal to the whole vehicle controller VCU1, the whole vehicle controller VCU1 sends a high-voltage down instruction to the power battery pack assembly 2, and then the whole vehicle controller VCU1 enters a dormant state;
The power battery pack assembly 2 receives a high-voltage command and then disconnects the main negative contactor and enters a dormant state.
Example 2:
example 2 is substantially the same as example 1 except that:
the alternating current power taking gun 6 is internally provided with a first resistor R1 and a power taking confirmation resistor R2, the shell of the alternating current power taking gun 6 is provided with a connection confirmation switch S3, one end of the first resistor R1 is connected with a grounding end 61 on the alternating current power taking gun 6, the other end of the first resistor R1 is connected with one end of the power taking confirmation resistor R2, the other end of the power taking confirmation resistor R2 is connected with a power taking confirmation interface end 62 on the alternating current power taking gun 6, and the connection confirmation switch S3 is connected with the first resistor R1 in parallel;
after the alternating current power taking gun 6 is inserted into the alternating current charging and discharging interface 5, a power taking confirmation interface end 62 on the alternating current power taking gun 6 is connected with a charging and discharging connection confirmation interface end CC on the alternating current charging and discharging interface 5, and a grounding end 61 on the alternating current power taking gun 6 is connected with a vehicle body ground interface end PE on the alternating current charging and discharging interface 5;
in the step S1, system wake-up and self-check in the power-up procedure, the bi-directional vehicle-mounted charger OBC3 detects the power-up signal on the charge-discharge connection confirmation interface end CC through the alternating-current charge-discharge interface 5;
In the step S2 of the power taking procedure and the on-system high voltage control, the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface CC and the vehicle body ground interface PE on the ac charging and discharging interface 5 is equal to the resistance of the power taking confirmation resistor R2.
Example 3:
example 3 is substantially the same as example 2 except that:
the resistance value of the power taking confirmation resistor R2 is 2KΩ;
in the step S2 of the power taking procedure and in the high-voltage control on the system, the bi-directional vehicle-mounted charger OBC3 detects that the power taking signal is normal when the resistance between the charging and discharging connection confirmation interface end CC on the alternating-current charging and discharging interface 5 and the vehicle body ground interface end PE is 2KΩ.