Disclosure of Invention
The invention provides a power-saving control method of a hybrid vehicle, which solves the problem that the power-saving performance of the existing hybrid vehicle is easy to be reduced when the hybrid vehicle is driven, can improve the electric balance capacity of the whole vehicle, increases the driving experience, and improves the energy conservation and intelligence of the vehicle.
In order to achieve the above object, the present invention provides the following technical solutions:
an electric protection control method of a hybrid vehicle, comprising:
acquiring the SOC and the required power of a vehicle power battery, and setting a corresponding relation table of the SOC, the required power and the vehicle power generation power;
selecting a vehicle mixed control mode according to the SOC and the required power, and entering an idle power generation mode if the vehicle gear is in a P/N gear and the SOC is smaller than a first electric quantity threshold value;
and when the vehicle runs normally, acquiring the running speed and the whole vehicle acceleration of the vehicle, and if the change value of the whole vehicle acceleration in a set time period is smaller than a first set threshold value, performing power generation output according to the vehicle power generation power obtained by looking up the table according to the corresponding relation table.
Preferably, the method further comprises:
setting a correction corresponding table of the SOC, the change rate of the acceleration of the whole vehicle and the correction coefficient of the vehicle generated power;
if the change value of the acceleration of the whole vehicle in the set time period is larger than a second set threshold value, the vehicle is judged to be in mountain road working condition operation, and the vehicle power generation is corrected according to the correction coefficient obtained by looking up the table of the correction correspondence table, so that the target power generation is obtained, wherein the second set threshold value is larger than the first set threshold value.
Preferably, setting the correction correspondence table includes:
and setting the level of the SOC of the whole vehicle power battery and the change degree of the acceleration of the whole vehicle, and establishing the correction corresponding table according to the SOC level of the power battery and the change level of the acceleration of the whole vehicle so that the correction coefficient corresponds to the corresponding SOC level and the change level of the acceleration of the whole vehicle.
Preferably, the correction coefficient is greater than or equal to 1.
Preferably, the method further comprises:
and if the vehicle gear is in the D/R gear and the SOC is smaller than the first electric quantity threshold value, controlling the vehicle to enter a serial driving mode or a parallel four-wheel driving mode, and charging a vehicle power battery.
Preferably, the method further comprises:
when the vehicle is in the series driving mode, if the required power is greater than a first power threshold, the vehicle is converted into a parallel four-wheel drive mode to drive the vehicle and charge a vehicle power battery.
Preferably, the method further comprises:
when the vehicle is in the parallel four-wheel drive mode, if the required power is smaller than a first power threshold and larger than a second power threshold, the vehicle is converted into a series drive mode to drive the vehicle and charge a vehicle power battery.
Preferably, the method further comprises:
when the vehicle is in the series drive mode, if the SOC is greater than a second electric quantity threshold and the required power is less than a third power threshold, the vehicle is converted into the pure electric mode, and the third power threshold is less than the second power threshold.
The invention provides a power-preserving control method of a hybrid vehicle, which is characterized in that through setting a corresponding relation table of the SOC of a vehicle power battery, the required power and the vehicle power, when the vehicle runs normally and the change value of the acceleration of the whole vehicle in a set time period is smaller than a first set threshold value, the vehicle power obtained by looking up the table according to the corresponding relation table is subjected to power generation output, so that the problem that the power-preserving performance of the existing hybrid vehicle is easy to be reduced during running is solved, the electric balance capacity of the whole vehicle can be improved, the driving experience is increased, and the energy conservation and intelligence of the vehicle are improved.
Detailed Description
In order to make the solution of the embodiment of the present invention better understood by those skilled in the art, the embodiment of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Aiming at the problem that the current hybrid vehicle is easy to generate the decline of the electricity-retaining performance in operation, the invention provides an electricity-retaining control method of the hybrid vehicle, which solves the problem that the current hybrid vehicle is easy to generate the decline of the electricity-retaining performance in running, can improve the electric balance capacity of the whole vehicle, increases the driving experience, and improves the energy conservation and the intelligence of the vehicle.
As shown in fig. 1, a power protection control method of a hybrid vehicle includes:
s1: and acquiring the SOC and the required power of the vehicle power battery, and setting a corresponding relation table of the SOC, the required power and the vehicle power generation power.
S2: and selecting a vehicle hybrid control mode according to the SOC and the required power, and if the vehicle gear is in the P/N gear and the SOC is smaller than a first electric quantity threshold value, entering an idle power generation mode by the vehicle.
S3: and when the vehicle runs normally, acquiring the running speed and the whole vehicle acceleration of the vehicle, and if the change value of the whole vehicle acceleration in a set time period is smaller than a first set threshold value, performing power generation output according to the vehicle power generation power obtained by looking up the table according to the corresponding relation table.
Specifically, when the hybrid vehicle is running, the whole vehicle controller VCU obtains the actual battery power through the battery management system, and calculates the SOC of the power battery according to the actual battery power. Meanwhile, the whole vehicle controller calculates the required power according to the accelerator pedal. The corresponding relation table is obtained by calibrating the SOC of the motor car battery, the required power and the vehicle power generation power, and is shown in table 1. The X-axis in Table 1 represents the driver demand power, and the Y-axis represents the SOC region level.
TABLE 1
And the hybrid vehicle performs power conservation control on the vehicle generated power obtained by looking up the table according to the corresponding relation, and enters an idle power generation mode when the gear is in the P/N gear and the SOC is smaller than the first electric quantity threshold. The engine can be operated in an economic area, the problem that the electricity retention performance of the existing hybrid vehicle is easy to drop during running is solved, the electric balance capacity of the whole vehicle can be improved, the driving experience is increased, and the energy conservation and the intelligence of the vehicle are improved.
The method further comprises the steps of:
setting correction corresponding tables of the SOC, the change rate of the acceleration of the whole vehicle and the correction coefficient of the vehicle generated power.
If the change value of the acceleration of the whole vehicle in the set time period is larger than a second set threshold value, the vehicle is judged to be in mountain road working condition operation, and the vehicle power generation is corrected according to the correction coefficient obtained by looking up the table of the correction correspondence table, so that the target power generation is obtained, wherein the second set threshold value is larger than the first set threshold value.
Specifically, on the basis of original electricity-keeping control of the hybrid vehicle, acceleration change is introduced, the electricity-keeping electric quantity of the whole vehicle is corrected along with the change of the vehicle acceleration value, if the hybrid vehicle runs on a mountain road, larger electricity-keeping electric quantity of the whole vehicle can be selected to carry out mountain road electricity-keeping correction so as to realize the correction of the mountain road electricity-keeping of the whole vehicle according to the change of the acceleration, thus reasonably outputting the electric quantity of the whole vehicle conforming to the mountain road working condition under the plain environment, and flexibly and accurately controlling the electric quantity of the hybrid vehicle in the mountain road area by adding the logic so as to meet the requirements of the dynamic property and the driving comfort of the mountain road of the plain.
Further, setting a correction correspondence table, including: and setting the level of the SOC of the whole vehicle power battery and the change degree of the acceleration of the whole vehicle, and establishing the correction corresponding table according to the SOC level of the power battery and the change level of the acceleration of the whole vehicle so that the correction coefficient corresponds to the corresponding SOC level and the change level of the acceleration of the whole vehicle.
Further, the correction coefficient is greater than or equal to 1.
In practical application, when the acceleration changes severely, the target engine power point of the whole vehicle is larger, the full-power generation meets the mountain road driving, the larger target power generation power point is dynamically adjusted according to the intensity of mountain road driving, and after the mountain road is identified mainly through the acceleration value change, the power generation target power is increased and corrected by using the following correction calibration to obtain a correction corresponding table, as shown in table 2.
TABLE 2
The X-axis in table 2 represents the acceleration value change level, and the larger the value of the X-axis is, the larger the acceleration change is; the Y-axis represents the regional class of SOCs.
In an embodiment, as shown in fig. 2, after entering a mountain road area through the recognition of the acceleration change of the whole vehicle, the actual power of the whole vehicle is almost used for driving along with the increase of the driving required power; meanwhile, the driving power of the whole mountain road is increased, so that the electricity retention performance is reduced. When the acceleration changes severely, the power point of the target engine of the whole vehicle is larger, the full-power generation meets the mountain road driving, the power point of the larger target power generation is dynamically regulated according to the intensity of mountain road driving, and after the mountain road is identified mainly through the change of the acceleration value, the power of the power generation target is increased and corrected by using the following correction calibration.
The method further comprises the steps of: and if the vehicle gear is in the D/R gear and the SOC is smaller than the first electric quantity threshold value, controlling the vehicle to enter a serial driving mode or a parallel four-wheel driving mode, and charging a vehicle power battery.
The method further comprises the steps of: when the vehicle is in the series driving mode, if the required power is greater than a first power threshold, the vehicle is converted into a parallel four-wheel drive mode to drive the vehicle and charge a vehicle power battery.
The method further comprises the steps of: when the vehicle is in the parallel four-wheel drive mode, if the required power is smaller than a first power threshold and larger than a second power threshold, the vehicle is converted into a series drive mode to drive the vehicle and charge a vehicle power battery.
The method further comprises the steps of: when the vehicle is in the series drive mode, if the SOC is greater than a second electric quantity threshold and the required power is less than a third power threshold, the vehicle is converted into the pure electric mode, and the third power threshold is less than the second power threshold.
Therefore, the invention provides the electric protection control method of the hybrid vehicle, which is characterized in that through setting the corresponding relation table of the SOC of the power battery of the vehicle, the required power and the power generated by the vehicle, when the vehicle runs normally and the change value of the acceleration of the whole vehicle in a set time period is smaller than a first set threshold value, the power generated by the vehicle is obtained by looking up the table according to the corresponding relation table to generate electricity and output, so that the problem that the electric protection performance of the existing hybrid vehicle is easy to be reduced during running is solved, the electric balance capacity of the whole vehicle can be improved, the driving experience is increased, and the energy conservation and the intelligence of the vehicle are improved.
While the construction, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, the above description is only a preferred embodiment of the present invention, but the present invention is not limited to the embodiments shown in the drawings, and all changes made according to the concepts of the present invention or modifications as equivalent embodiments are within the scope of the present invention without departing from the spirit covered by the specification and drawings.