CN111196167B - Vehicle power control method and device and electric vehicle - Google Patents
Vehicle power control method and device and electric vehicleDownload PDFInfo
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- CN111196167B CN111196167BCN201811368188.XACN201811368188ACN111196167BCN 111196167 BCN111196167 BCN 111196167BCN 201811368188 ACN201811368188 ACN 201811368188ACN 111196167 BCN111196167 BCN 111196167B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
Description
Technical Field
The invention relates to the field of automobiles, in particular to a vehicle power control method and device and an electric automobile.
Background
In a hybrid power system comprising a power battery and a super capacitor, power distribution between the power battery and the super capacitor is a main problem to be solved by the hybrid power control system. In the related art, the adopted method is mainly a logic threshold value control method: the input quantity of the energy management system of the electric automobile adopting the composite power supply is mostly parameters of the vehicle and certain parts of the vehicle, such as the vehicle speed of the vehicle, the SOC of a power battery pack, the voltage of a super capacitor pack and the like, a power value is determined, a main working strategy of the super capacitor is executed when the power value is exceeded, and a main discharging strategy of the battery is executed when the power value is lower. When the battery is limited to work within a certain charging and discharging power, the charging and discharging efficiency is high, the method is simple and easy to implement, but the advantages of the composite power supply cannot be fully exerted. And other intelligent control algorithms, such as dynamic programming, neural networks, genetic algorithms and the like, have complex calculation methods and are not suitable for real-time control on vehicles.
In addition, the hybrid power supply comprises a power battery, a super capacitor and a bidirectional DC/DC, wherein the super capacitor is connected to the two ends of the positive electrode and the negative electrode of the battery in parallel through the bidirectional DCDC. The input and output currents of the super capacitor pass through the bidirectional DC/DC, and although the super capacitor has high efficiency, the input and output currents are large and cause great loss when passing through the bidirectional DC/DC.
Therefore, in the related art, there is a problem that the use of the hybrid power supply is not optimally controlled, resulting in waste of resources.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a vehicle power control method and device and an electric vehicle, and at least solves the technical problem that resource waste is caused by non-optimized control of the use of a hybrid power supply in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a vehicle power control method including: determining a driving mode of the vehicle; under the condition that the driving mode allows the use of the super capacitor, receiving driving required power sent by the vehicle controller; and controlling the super capacitor to provide power for the vehicle when the driving demand power is larger than a power threshold value of a starting super capacitor corresponding to the driving mode.
Optionally, after determining the driving mode of the vehicle, the method further includes: and in the case that the driving mode does not allow the super capacitor to be used, forbidding the super capacitor to be used for supplying power to the vehicle.
Optionally, controlling the supercapacitor to provide power to the vehicle comprises: determining the power required to be provided by the super capacitor according to the driving required power and the power threshold; controlling the super capacitor to provide the determined power to the vehicle.
Optionally, the power threshold is determined according to the charging and discharging power and the charging and discharging duration of the battery pack in the corresponding driving mode.
Optionally, the driving mode includes: under the conditions of an economy mode, a normal mode and a violent mode, the power threshold value corresponding to the normal mode is larger than the power threshold value corresponding to the violent mode, and the economy mode is a mode which does not allow the super capacitor to be used.
Optionally, determining the driving mode of the vehicle comprises: and determining the driving mode of the vehicle according to the input driving mode selection instruction.
Optionally, before determining the driving mode of the vehicle, the method further includes: judging whether the state of a hybrid power supply of the vehicle is normal or not, wherein the state of the hybrid power supply comprises the following steps: the state of the super capacitor and the state of the battery pack; and starting to enter a driving mode selection process under the condition that the state of the hybrid power supply of the vehicle is normal as a judgment result.
According to another aspect of the present invention, there is provided a vehicle power control apparatus including: the determining module is used for determining the driving mode of the vehicle; the receiving module is used for receiving driving required power sent by the vehicle controller under the condition that the driving mode allows the super capacitor to be used; and the control module is used for controlling the super capacitor to provide power for the vehicle under the condition that the driving required power is greater than a power threshold value of starting the super capacitor corresponding to the driving mode.
According to still another aspect of the present invention, there is provided a storage medium including a stored program, wherein a device in which the storage medium is located is controlled to perform the vehicle power control method according to any one of the above when the program is executed.
According to still another aspect of the present invention, there is provided an electric vehicle including the vehicle power control apparatus described above.
In the embodiment of the invention, by adopting a mode of controlling the super capacitor to provide power for the vehicle under the condition that the driving mode allows the super capacitor to be used and the driving required power is greater than the power threshold value for starting the super capacitor corresponding to the driving mode, the purpose of distributing power based on the power threshold value corresponding to the driving mode is achieved by corresponding the power threshold value for starting the super capacitor to the corresponding driving mode, so that the technical effects of optimizing control and saving resources are realized, and the technical problem of resource waste caused by non-optimized control of the use of the composite power supply in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a vehicle power control method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a control system for a hybrid power supply provided in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of a control method of a hybrid power supply provided according to an embodiment of the invention;
fig. 4 is a block diagram of the structure of a vehicle power control apparatus according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided a method embodiment of a vehicle power control method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
Fig. 1 is a flowchart of a vehicle power control method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, determining the driving mode of the vehicle;
step S104, receiving driving required power sent by the vehicle control unit under the condition that the driving mode allows the super capacitor to be used;
and step S106, controlling the super capacitor to provide power for the vehicle under the condition that the driving required power is larger than the power threshold value of the starting super capacitor corresponding to the driving mode.
Through the steps, the method of controlling the super capacitor to provide power for the vehicle is adopted under the condition that the driving mode allows the super capacitor to be used and the driving required power is larger than the power threshold value for starting the super capacitor corresponding to the driving mode, and the purpose of distributing the power based on the power threshold value corresponding to the driving mode is achieved by corresponding the power threshold value for starting the super capacitor to the corresponding driving mode, so that the technical effects of optimizing control and saving resources are achieved, and the technical problem that the resource waste is caused due to the fact that the composite power source is not optimally controlled in use in the related technology is solved.
The driving modes may be divided in various manners, for example, the driving modes may be divided according to a uniform division standard of all vehicles, or may be divided according to a standard established by each brand of vehicle. Since the division of the driving pattern is related to the power distribution, the driving pattern of the vehicle may be divided according to the magnitude of the power for driving the vehicle in order to accurately and reasonably realize the power distribution.
Optionally, after determining the driving mode of the vehicle, the method may further include: and in the case that the driving mode does not allow the super capacitor to be used, the super capacitor is forbidden to be used for supplying power to the vehicle. For example, for a mode selected by a driver, the driving power of the whole vehicle is low, and in order to improve the charging and discharging efficiency of the whole vehicle, the bidirectional DC/DC converter can be directly turned off, the super capacitor does not charge and discharge outwards, and only the battery charges and discharges outwards. It should be noted that, the mode selected by the driver may be an extreme economic driving mode, and the driving power of the entire vehicle in the mode is low, so that the super capacitor can be directly controlled not to be charged and discharged externally, and the charging and discharging efficiency of the entire vehicle is effectively improved.
In controlling the super capacitor to provide power to the vehicle, various ways may also be used, for example, the super capacitor may be controlled to provide power to the vehicle in the following ways: determining the power required to be provided by the super capacitor according to the driving required power and a power threshold; and then controlling the super capacitor to provide the determined power for the vehicle. The battery pack provides the power which can be provided, and when the driving required power is large, the super capacitor provides the excess part, so that the power consumption of the battery is fully used, and the additional power consumption brought by the use of the super capacitor is effectively avoided.
Vehicles (e.g., electric only vehicles) typically include multiple driving modes, such as economy mode, wild mode, regular mode, and the like. Different driving modes generally correspond to different vehicle dynamic outputs, and the different dynamic outputs indicate different electric power demands of the vehicle. Therefore, the logic threshold control method in the related art cannot be completely applied to the development of the current pure electric vehicle. The economy mode generally limits the speed of the whole vehicle, limits the charge and discharge power of the battery within a power range with higher battery efficiency, and may cause slightly larger power discharge for a short time, and generally does not need a super capacitor to work. In addition, in order to avoid using a super capacitor and bidirectional DC/DC in an economic mode, the loss of DC/DC components can be avoided, and the charging and discharging efficiency of the composite power supply is improved. The violent mode generally refers to a driving mode with the strongest vehicle dynamic property, and the vehicle can reach the highest speed in the mode, and the charging and discharging power of a battery can reach the highest bearable power during acceleration and deceleration, so that the super capacitor is needed to be intervened to work most in the mode. Conventional mode vehicles typically have a conventional driving feel, and in this mode, the battery may experience a high power charge and discharge condition, but the power level and duration may be less than in the aggressive mode.
Thus, when the driver selects a different driving mode, it indicates that the battery will operate under different driving conditions. If the hybrid power supply control system only selects one power threshold value to control the hybrid power supply, the requirements of different driving modes cannot be met. If the power threshold value is selected according to the charge-discharge power and the duration of the battery in the conventional driving feeling, the situation that the capacity of the super capacitor is insufficient in a violent mode can occur; if the power threshold value is selected according to the charge-discharge power and the duration of the battery in the violent mode, the super capacitor cannot be started by the hybrid power supply in a conventional mode for a plurality of times, so that the resource waste of the hybrid power supply is caused.
In the related art, since the power distribution is not made reasonable in combination with the driving intention expressed by the driver through the selection of the driving mode, there are problems that the control is not optimized and the resources are wasted. In order to solve the problem, in the embodiment of the invention, the input and output power of the hybrid power supply electric vehicle is more reasonably distributed by combining the vehicle driving mode information selected by the driver.
It should be noted that the power threshold may be determined according to the charging and discharging power and the time duration of the battery pack in the corresponding driving mode. For example, in the driving mode, the following are included: under the conditions of the economy mode, the normal mode and the fierce mode, the power threshold corresponding to the economy mode is larger than the power threshold corresponding to the normal mode, the power threshold corresponding to the normal mode is larger than the power threshold corresponding to the fierce mode, wherein the economy mode can be a mode which does not allow the super capacitor to be used. Since the magnitude and duration of the driving demand power of the aggressive driving mode are greater than those of the driving demand power of the driver of the conventional driving mode, and the capacity of the super capacitor is limited, the power threshold corresponding to the conventional mode is greater than that corresponding to the aggressive driving mode. In the economy mode, the power threshold corresponding to the economy mode can be set to be maximum because the super capacitor can be not turned on to provide power. For example, when the power threshold corresponding to the economy mode is set to be as large as possible, the economy mode may be considered as the driving mode in which the use of the super capacitor is not allowed as described above.
As an alternative embodiment, when determining the driving mode of the vehicle, the driving mode of the vehicle may be determined by an input driving mode selection instruction. The input at this time may be default input setting when the vehicle leaves a factory, or may be temporarily input by the driver while driving, and may be flexibly set according to the requirements.
Optionally, before determining the driving mode of the vehicle, the method further includes: judging whether the state of a hybrid power supply of the vehicle is normal or not, wherein the state of the hybrid power supply comprises the following steps: the state of the super capacitor and the state of the battery pack; and starting to enter a driving mode selection process under the condition that the state of the hybrid power supply of the vehicle is normal as a judgment result. That is, before the power distribution of the hybrid power supply is performed, it is determined that the state of the hybrid power supply is good, and if there is a failure in the hybrid power supply, the hybrid power supply control flow can be ended in time.
Based on the above examples, the following preferred embodiments are provided herein in order to specifically explain the present invention.
In the preferred embodiment, the energy management system and the energy management method for the hybrid power supply of the electric vehicle realize reasonable distribution of power between the power battery pack and the super capacitor pack in the hybrid power supply according to different driving modes and normal energy recovery levels based on the setting of a driver on the vehicle.
Fig. 2 is a schematic diagram of a control system of a hybrid power supply according to an embodiment of the present invention, and as shown in fig. 2, the control system includes: the system comprises a vehicle control unit 1, a hybrid power acquisition system 2, a hybrid power controller 3, a super capacitor bank 4, a power battery bank 5, a bidirectional DC/DC converter 6, a driving motor and controller 7 thereof, a signal acquisition and processing system 8 and a man-machine interaction device for selecting a driving mode.
For example, a pure electric vehicle generally provides several driving modes for a driver to select, such as an economy mode, a fierce mode, a normal mode, and the like. The model names of different brands of vehicles differ, but the types are mainly three: (1) the economic mode does not allow the battery to discharge at high power, and is suitable for energy conservation and stable driving conditions; (2) the conventional mode meets the conventional power demand of the driver according to the pedal demand of the driver; (3) and in the violent mode, the battery and the motor are allowed to discharge the maximum power, and the maximum dynamic property of the whole vehicle is provided.
Based on the control system of the hybrid power supply, in a preferred embodiment of the present invention, a control method of the hybrid power supply is further provided, and fig. 3 is a flowchart of the control method of the hybrid power supply according to an embodiment of the present invention, as shown in fig. 3.
And the composite power supply controller receives state parameters of a battery pack, a super capacitor pack and the bidirectional DC/DC in the composite power supply and judges whether the composite power supply can work. And if the composite power supply has a fault, ending the control flow of the composite power supply.
And if the hybrid power supply state is normal, receiving the driving mode setting which is acquired by the vehicle control unit and set by the driver.
If the driver selects the economic driving mode, the driving power of the whole vehicle is low, in order to improve the charging and discharging efficiency of the whole vehicle, the bidirectional DC/DC converter is closed, the super capacitor does not charge and discharge the whole vehicle, and only the battery charges and discharges the whole vehicle.
And if the driver selects the conventional driving mode, receiving the driving required power | Preq | sent to the composite power supply controller by the vehicle control unit. If the driving demand power is greater than P1, the super capacitor and the bidirectional DC/DC controller provide | Preq | -P1 partial power.
And if the driver selects a violent driving mode, receiving the driving required power | Preq | sent to the composite power supply controller by the vehicle control unit. If the driving demand power is greater than P2, the super capacitor and the bidirectional DC/DC controller provide | Preq | -P2 partial power.
It should be noted that, since the magnitude and duration of the driving demand power in the aggressive driving mode are greater than those in the conventional driving mode, and the capacity of the super capacitor is limited, the power limit P1 is greater than P2.
In addition, it should be noted that when the driving mode of the vehicle is large, a plurality of power limits are set. The larger the charging and discharging power and the longer the charging and discharging time of the battery pack are, the larger the selected P value is.
In the energy management system of the hybrid power supply electric vehicle provided by the preferred embodiment, the hybrid power supply is controlled based on the driving mode of the vehicle, so that the input information of a driver is facilitated, the power requirement of the whole vehicle on the power supply system is determined, and the hybrid power supply system is controlled more reasonably.
In an embodiment of the present invention, there is also provided a vehicle power control apparatus, and fig. 4 is a block diagram of a structure of the vehicle power control apparatus according to the embodiment of the present invention, as shown in fig. 4, the apparatus includes: a determination module 42, a reception module 44 and a control module 46, which are explained below.
A determination module 42 for determining a driving mode in which the vehicle is located; a receiving module 44, connected to the determining module 42, for receiving driving demand power sent by the vehicle controller when the driving mode allows the super capacitor to be used; and a control module 46, connected to the receiving module 44, for controlling the super capacitor to provide power to the vehicle when the driving demand power is greater than a power threshold value of the turned-on super capacitor corresponding to the driving mode.
In an embodiment of the present invention, a storage medium is further provided, and the storage medium includes a stored program, wherein when the program runs, a device on which the storage medium is located is controlled to execute any one of the above-mentioned vehicle power control methods.
In an embodiment of the present invention, an electric vehicle is further provided, fig. 5 is a schematic structural diagram of the electric vehicle provided according to the embodiment of the present invention, and as shown in fig. 5, the electric vehicle 50 includes the vehicle power control device 52 described above.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit may be a division of a logic function, and an actual implementation may have another division, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or may not be executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A vehicle power control method, characterized by comprising:
determining a driving mode of the vehicle;
under the condition that the driving mode allows the use of the super capacitor, receiving driving required power sent by the vehicle controller;
controlling the super capacitor to provide power for the vehicle when the driving demand power is larger than a power threshold value of a starting super capacitor corresponding to the driving mode;
the driving mode comprises the following steps: under the conditions of an economy mode, a normal mode and a violent mode, the power threshold value corresponding to the normal mode is larger than the power threshold value corresponding to the violent mode, and the economy mode is a mode which does not allow the super capacitor to be used.
2. The method of claim 1, after determining the driving mode of the vehicle, further comprising:
and in the case that the driving mode does not allow the super capacitor to be used, forbidding the super capacitor to be used for supplying power to the vehicle.
3. The method of claim 1, wherein controlling the supercapacitor to provide power to the vehicle comprises:
determining the power required to be provided by the super capacitor according to the driving required power and the power threshold;
controlling the super capacitor to provide the determined power to the vehicle.
4. The method of claim 2, wherein the power threshold is determined according to the charging and discharging power and the charging and discharging duration of the battery pack in the corresponding driving mode.
5. The method of claim 1, wherein determining the driving mode in which the vehicle is located comprises:
and determining the driving mode of the vehicle according to the input driving mode selection instruction.
6. The method of any of claims 1-5, further comprising, prior to determining the driving mode of the vehicle:
judging whether the state of a hybrid power supply of the vehicle is normal or not, wherein the state of the hybrid power supply comprises the following steps: the state of the super capacitor and the state of the battery pack;
and starting to enter a driving mode selection process under the condition that the state of the hybrid power supply of the vehicle is normal as a judgment result.
7. A vehicle power control apparatus, characterized by comprising:
the determining module is used for determining the driving mode of the vehicle;
the receiving module is used for receiving driving required power sent by the vehicle controller under the condition that the driving mode allows the super capacitor to be used;
the control module is used for controlling the super capacitor to provide power for the vehicle under the condition that the driving required power is larger than a power threshold value of starting the super capacitor corresponding to the driving mode;
the apparatus is configured to, in the driving mode: under the conditions of an economy mode, a normal mode and a violent mode, the power threshold value corresponding to the normal mode is larger than the power threshold value corresponding to the violent mode, and the economy mode is a mode which does not allow the super capacitor to be used.
8. A storage medium characterized by comprising a stored program, wherein a device in which the storage medium is located is controlled to execute the vehicle power control method according to any one of claims 1 to 6 when the program is executed.
9. An electric vehicle characterized by comprising the vehicle power control apparatus of claim 7.
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| CN201811368188.XACN111196167B (en) | 2018-11-16 | 2018-11-16 | Vehicle power control method and device and electric vehicle |
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| CN201811368188.XACN111196167B (en) | 2018-11-16 | 2018-11-16 | Vehicle power control method and device and electric vehicle |
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- 2018-11-16CNCN201811368188.XApatent/CN111196167B/ennot_activeExpired - Fee Related
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| DE102010001817A1 (en)* | 2010-02-11 | 2011-08-11 | Robert Bosch GmbH, 70469 | Control concept with limit value management for DC / DC converters in an energy system |
| CN104163116B (en)* | 2014-07-31 | 2016-05-18 | 清华大学 | The energy management method of automobile-used composite energy storage system |
| CN106427615A (en)* | 2016-09-20 | 2017-02-22 | 江苏大学 | Composite power source control system and switching method thereof under different work conditions |
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