CN110667394B - Battery SOC brake recovery system and method and electric automobile - Google Patents
Battery SOC brake recovery system and method and electric automobile Download PDFInfo
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- CN110667394B CN110667394B CN201910932058.2A CN201910932058A CN110667394B CN 110667394 B CN110667394 B CN 110667394B CN 201910932058 A CN201910932058 A CN 201910932058A CN 110667394 B CN110667394 B CN 110667394B
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- 230000010354 integration Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a braking recovery system and method of a battery SOC and an electric automobile, wherein the braking recovery system comprises: the vehicle control unit is used for acquiring the current vehicle speed and a brake pedal signal; the motor controller is used for receiving a braking control signal of the whole vehicle controller; the driving motor is used for receiving a braking recovery torque signal of the motor controller and outputting a theoretical braking recovery power signal and a recovery power control signal of the vehicle controller to judge the recovery power so as to determine the charging quantity Q1 of the rechargeable power battery; the power battery is used for outputting a current recovered power limiting signal to the battery management system BMS; the battery management system BMS is used for receiving a current recovered power limiting signal of the power battery and detecting the SOC state of the power battery so as to determine the loss electric quantity Q of the power battery and feed back the loss electric quantity Q to the vehicle control unit; the scheme provided by the invention effectively improves the recovery rate of braking energy, meets the energy recovery requirement of the power battery under high SOC, and prolongs the endurance mileage of the electric vehicle.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and particularly relates to a braking recovery system and method of a battery SOC and an electric automobile.
Background
For the current pure electric vehicles, the driving range is most concerned by consumers and is also the most concerned problem during driving; because the motor is different from the engine, the recovery of the braking energy of the electric automobile can prolong the driving range of the electric automobile; the relative recovery rate of the current common recovery strategy is not very high, and only relatively fixed brake recovery torque can be set, so that the brake recovery rate is small and the brake comfort is not very good; in addition, the regenerative braking torque is relatively fixed, so that the regenerative braking power is relatively high, and the energy recovery of the power battery cannot be carried out when the SOC of the battery is high.
Disclosure of Invention
The invention designs a braking recovery system and method of a battery SOC and an electric automobile, and solves the problem that the existing braking recovery system cannot recover energy when the battery SOC is in a higher state.
In order to solve the technical problems, the invention adopts the following scheme:
a braking recovery system of a battery SOC comprises a vehicle control unit, a motor controller, a driving motor, a power battery and a battery management system BMS; the vehicle control unit is used for acquiring a current vehicle speed and a brake pedal signal and outputting a brake control signal to the motor controller; the motor controller is used for receiving a brake control signal of the vehicle control unit and outputting a brake recovery torque signal to the driving motor according to a brake demand; the driving motor is used for receiving a braking recovery rotation torque signal of the motor controller and outputting a theoretical braking recovery power signal and a recovery power control signal of the vehicle controller to judge the recovery power so as to determine the charging quantity Q1 of the charging power battery; the power battery is used for outputting a current recovered power limiting signal to the battery management system BMS; the battery management system BMS is used for receiving a current recovered power limiting signal of the power battery and detecting the SOC state of the power battery so as to determine the loss electric quantity Q of the power battery and feed back the loss electric quantity Q to the vehicle control unit.
Further, the vehicle control unit judges the braking demand according to the signal of the brake pedal, analyzes and judges the demand of braking deceleration, and then outputs a braking control signal to the motor controller.
Further, the battery management system BMS collects the charging current and the voltage of the power battery in the process of regenerative braking, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery, and the integration formula is as follows: q1= IUdt.
Further, the vehicle control unit judges the charging quantity Q1 in real time according to the regenerative braking; when the charged amount Q1 is the same as the lost charge Q, the drive motor stops regenerative braking and mechanical braking is used instead of regenerative braking.
Further, when Q1 is less than 0.9Q, the power battery is charged according to the theoretical braking recovery power; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90 percent of the theoretical brake recovery power; when Q1 is more than or equal to Q, the driving motor stops the regenerative braking.
Further, after the brake pedal signal disappears, the lost electric quantity Q is refreshed at the start of the next braking.
Correspondingly, in combination with the above scheme, the method for recovering braking of the battery SOC further comprises the following steps:
the vehicle control unit collects a brake pedal signal, judges the braking demand according to the brake pedal signal and analyzes and judges the demand of braking deceleration;
the driving motor carries out feedback braking according to braking requirements and charges the power battery;
when the braking recovery is started, the battery management system BMS detects the SOC state of the power battery, determines the loss electric quantity Q of the power battery, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery, wherein the integration formula is as follows: q1= IUdt;
when Q1 is less than 0.9Q, the power battery is charged according to the theoretical braking recovery power; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90 percent of the theoretical brake recovery power; when Q1 is more than or equal to Q, the driving motor stops the regenerative braking.
Further, the following processes are also included:
after the brake pedal signal disappears, the lost electric quantity Q is refreshed again when the next braking starts.
Correspondingly, the invention further provides an electric automobile which comprises a braking recovery system of the battery SOC, wherein the braking recovery system of the battery SOC is the braking recovery system of the battery SOC.
The braking recovery system and method for the battery SOC and the electric automobile have the following beneficial effects:
by adopting the scheme, the recovery power required by braking in the current driving mode is judged by acquiring the real-time vehicle speed, the brake pedal, the motor rotating speed, the battery SOC and the charged current and voltage, the braking recovery torque is determined according to the braking recovery power, and the effective recovery of the whole vehicle kinetic energy is increased; the energy recovery system can still normally recover energy when the SOC of the power battery is higher, effectively improve the recovery rate of braking energy, meet the energy recovery requirement of the power battery under high SOC, effectively reduce the energy loss in the braking process and prolong the endurance mileage of the electric vehicle; the scheme provided by the invention has the advantages of reasonable structure, convenience in implementation, convenience in popularization and capability of being directly applied to the existing electric automobile control system and effectively improving the product competitiveness of the electric automobile.
Drawings
FIG. 1: the invention relates to a schematic diagram of a braking recovery system of a battery SOC;
FIG. 2: the invention discloses a flow chart of a braking recovery method of a battery SOC.
Detailed Description
The invention will be further explained with reference to the accompanying drawings:
fig. 1 shows a brake recovery system of a battery SOC, comprising a vehicle control unit, a motor controller, a driving motor, a power battery and a battery management system BMS; the vehicle control unit is used for acquiring a current vehicle speed and a brake pedal signal and outputting a brake control signal to the motor controller; specifically, the vehicle control unit judges the braking demand according to the signal of the brake pedal, analyzes and judges the demand of braking deceleration, and then outputs a braking control signal to the motor controller; further, the vehicle control unit also collects the rotating speed of the driving motor to obtain the real-time rotating speed of the driving motor in the braking process; the motor controller is used for receiving a braking control signal of the vehicle control unit and outputting a braking recovery torque signal to the driving motor according to a braking demand; the driving motor is used for receiving a braking recovery torque signal of the motor controller and outputting a theoretical braking recovery power signal, and the vehicle control unit judges the recovery power through a control logic according to the recovery power control signal and the theoretical braking recovery power signal of the vehicle control unit so as to determine the charging quantity Q1 of the rechargeable power battery; the power battery is used for outputting a current recovered power limiting signal to the battery management system BMS and recovering energy in a feedback braking mode; the battery management system BMS is used for receiving a current recovered power limiting signal of the power battery and detecting the SOC state of the power battery to determine the loss electric quantity Q of the power battery, so that the loss electric quantity Q is fed back to the vehicle control unit, and the vehicle control unit compares the loss electric quantity Q with a charging quantity Q1 according to the loss electric quantity Q, so that energy recovery of the power battery is realized when the SOC of the power battery is in a high-point state; it should be noted that the soc (state of charge) of the battery is very charge state, also called residual capacity, and the ratio of the residual capacity of the battery after being used for a period of time or left unused for a long time to the capacity of the battery in its fully charged state is usually expressed by percentage; the value range is 0-1, when SOC =0, the battery is completely discharged, and when SOC =1, the battery is completely full; further, the battery management system BMS collects the charging current and the voltage of the power battery in the process of regenerative braking, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery, and the integration formula is as follows: q1= IUdt; q1 is the charge of the battery, in order to monitor the real-time charge and compare it with the chargeable amount of the battery, if the real-time charge is lower than the chargeable amount of the battery, the charge is continued, otherwise, the charge is stopped; specifically, the brake recovery system collects real-time vehicle speed, a brake pedal, motor rotating speed, battery SOC (state of charge) and charged current and voltage, the vehicle control unit judges the recovery rate estimation of the battery through control logic according to collected related information, and combines the motor controller with the acquisition and the output of control signals and the acquisition and the judgment of BMS (battery management system) signals to determine the recovery power required by braking in the current driving mode, determine the brake recovery torque according to the recovery power of braking and increase the effective recovery of the whole vehicle kinetic energy; by adopting the technical scheme, the normal energy recovery of the power battery can be realized when the SOC is higher, the braking energy recovery rate is effectively improved, the energy recovery requirement of the power battery under the high SOC is met, the 100% recovery braking of the SOC of the battery can be realized, meanwhile, the energy loss in the braking process is effectively reduced, the endurance mileage of the electric automobile is improved, the customer satisfaction is favorably improved, and the competitiveness of the product is improved.
Preferably, with reference to the above technical solution, as shown in fig. 1, in this embodiment, the vehicle controller determines the charging amount Q1 in real time according to regenerative braking; when the charging quantity Q1 is the same as the loss electric quantity Q, the driving motor stops the regenerative braking, and the mechanical braking replaces the regenerative braking, so that the energy recovery of the power battery is realized at a higher SOC point, the recovery rate of the braking energy is improved, the energy loss in the braking process is reduced, and the conversion rate of the braking energy is improved.
Preferably, with reference to the above technical solution, as shown in fig. 1, in this embodiment, when Q1 < 0.9Q, the power battery is charged according to the theoretical braking recovered power, so that the power battery performs energy recovery in the low SOC state of the battery; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90% of the theoretical brake recovery power, so that the energy recovery of the power battery is realized when the SOC high point state of the battery is realized; when Q1 is more than or equal to Q, the loss electric quantity Q is less than or equal to the charging quantity Q1, and the driving motor stops regenerative braking; by comparing the loss electric quantity Q with the charging quantity Q1, the energy recovery of the power battery can be realized in any battery SOC state, particularly in the battery SOC high-point state, the braking energy recovery rate is effectively improved, and the energy recovery requirement of the power battery in the high SOC state is met.
Preferably, with reference to the above technical solution, as shown in fig. 1, in this embodiment, after the brake pedal signal disappears, the vehicle controller does not collect the brake pedal signal, and the loss electric quantity Q is refreshed when the next braking starts, so as to obtain the latest loss electric quantity Q, thereby playing a role of updating in real time, improving the intelligence of the system, effectively improving the recovery rate of braking energy, and meeting the energy recovery requirement of the power battery in any battery SOC state.
Correspondingly, in combination with the above solution, as shown in fig. 2, the method for recovering braking of the battery SOC further includes the following steps:
when a brake pedal is stepped on, the vehicle control unit collects a brake pedal signal, judges the braking demand according to the brake pedal signal, analyzes and judges the demand of braking deceleration and then transmits the braking demand to the motor controller;
the motor controller outputs braking recovery torque to the driving motor according to the received braking demand, the driving motor feeds back the braking torque and outputs recovery power according to the deceleration demand, and a judgment signal of the whole vehicle controller outputs the actually required recovery power to the power battery through power conversion so as to charge the power battery;
when the braking recovery is started, the battery management system BMS detects the SOC state of the power battery, determines the loss electric quantity Q of the power battery, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery, wherein the integration formula is as follows: q1= IUdt, integral formula: q1= IUdt; q1 is the charge of the battery, which is to monitor the real-time charge and compare it with the chargeable quantity of the battery, if the real-time charge is lower than the chargeable quantity of the battery, the charge is continued, otherwise, the charge is stopped;
when Q1 is less than 0.9Q, the power battery is charged according to the theoretical braking recovery power, so that the power battery performs energy recovery when the SOC of the battery is in a low-point state; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90% of the theoretical brake recovery power, so that the energy recovery of the power battery is realized when the SOC high point state of the battery is realized; when Q1 is more than or equal to Q, the loss electric quantity Q is less than or equal to the charging quantity Q1, and the driving motor stops the regenerative braking.
Preferably, in combination with the above technical solution, as shown in fig. 2, in this embodiment, the following process is further included: after the brake pedal signal disappears, the lost electric quantity Q is refreshed again when the next braking starts; specifically, when the brake pedal is released, the power battery does not recover the braking energy, and the loss electric quantity Q can be refreshed again in the next braking so as to obtain the latest loss electric quantity Q, thereby playing the role of real-time updating, improving the intelligence of the system, effectively improving the recovery rate of the braking energy, reducing the energy loss in the braking process, and improving the conversion rate of the braking energy so as to meet the energy recovery requirement of the power battery in any battery SOC state.
Correspondingly, by combining the scheme, the invention also provides the electric automobile which comprises a battery SOC braking recovery system, wherein the battery SOC braking recovery system is the battery SOC braking recovery system, and the energy loss in the braking process can be effectively reduced and the endurance mileage of the electric automobile can be improved by integrating the battery SOC braking recovery system, so that the product competitiveness can be improved.
By adopting the scheme, the recovery power required by braking in the current driving mode is judged by collecting the real-time vehicle speed, the brake pedal, the motor rotating speed, the battery SOC and the charged current and voltage, the braking recovery torque is determined according to the braking recovery power, and the effective recovery of the whole vehicle kinetic energy is increased; the energy recovery system can still normally recover energy when the SOC of the power battery is higher, effectively improve the recovery rate of braking energy, meet the energy recovery requirement of the power battery under high SOC, effectively reduce the energy loss in the braking process and prolong the endurance mileage of the electric vehicle; the scheme provided by the invention has the advantages of reasonable structure, convenience in implementation, convenience in popularization and capability of being directly applied to the existing electric automobile control system and effectively improving the product competitiveness of the electric automobile.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (4)
1. A braking recovery system of a battery SOC is characterized by comprising a vehicle control unit, a motor controller, a driving motor, a power battery and a battery management system BMS; wherein,
the vehicle control unit is used for acquiring the current vehicle speed and a brake pedal signal and outputting a brake control signal to the motor controller; the vehicle control unit judges the braking demand according to the signal of the brake pedal, analyzes and judges the demand of braking deceleration, and then outputs a braking control signal to the motor controller;
the motor controller is used for receiving a braking control signal of the vehicle control unit and outputting a braking recovery torque signal to the driving motor according to a braking demand;
the driving motor is used for receiving a braking recovery torque signal of the motor controller and outputting a theoretical braking recovery power signal, and the vehicle control unit judges the recovery power through a recovery power control signal of the vehicle control unit and the theoretical braking recovery power signal through a control logic so as to determine a charging quantity Q1 charged into the power battery;
the power battery is used for outputting a current recovered power limiting signal to the battery management system BMS;
the battery management system BMS is used for receiving a current recovered power limiting signal of the power battery and detecting the SOC state of the power battery so as to determine the loss electric quantity Q of the power battery and feed back the loss electric quantity Q to the vehicle control unit; the battery management system BMS collects the charging current and voltage of the power battery in the regenerative braking process, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery to obtain a charging quantity Q1, wherein the integration formula is as follows: q1= IUdt;
the vehicle control unit judges the charging quantity Q1 in real time according to feedback braking; when the charging quantity Q1 is the same as the loss electric quantity Q, stopping regenerative braking by the driving motor, and replacing the regenerative braking by mechanical braking;
when Q1 is less than 0.9Q, the power battery is charged according to the theoretical braking recovery power; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90% of the theoretical brake recovery power; and when the Q1 is more than or equal to Q, stopping the regenerative braking of the driving motor.
2. The system of claim 1, wherein the lost charge Q is refreshed upon the start of the next braking event after the brake pedal signal is removed.
3. A brake recovery method of a battery SOC for a brake recovery system of a battery SOC according to any one of claims 1-2, characterized by comprising the process of:
s1: the vehicle control unit collects a brake pedal signal, judges the braking demand according to the brake pedal signal and analyzes and judges the demand of braking deceleration;
s2: the driving motor carries out feedback braking according to braking requirements and charges the power battery;
s3: when the braking recovery is started, a battery management system BMS detects the SOC state of the power battery, determines the loss electric quantity Q of the power battery, and carries out real-time integration on the product of the charging current I and the voltage U of the power battery, wherein the integration formula is as follows: q1= IUdt;
s4: when Q1 is less than 0.9Q, the power battery is charged according to the theoretical braking recovery power; when Q1 is more than or equal to 0.9Q and less than Q, the driving motor reduces the recovery power of the recovery brake to limit the recovery power to 90% of the theoretical brake recovery power; and when the Q1 is more than or equal to Q, stopping the regenerative braking of the driving motor.
4. An electric vehicle comprising a brake recovery system of a battery SOC, characterized in that the brake recovery system of the battery SOC is a brake recovery system of the battery SOC according to any one of claims 1 to 2.
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| CN201910932058.2A CN110667394B (en) | 2019-09-29 | 2019-09-29 | Battery SOC brake recovery system and method and electric automobile |
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| CN111267626A (en) * | 2020-01-21 | 2020-06-12 | 浙江吉利新能源商用车集团有限公司 | Braking energy recovery method and system and electric automobile |
| CN112092636B (en) * | 2020-08-24 | 2021-12-07 | 奇瑞新能源汽车股份有限公司 | Electric vehicle, regenerative braking control method and device thereof, and storage medium |
| CN112158075B (en) * | 2020-10-10 | 2021-12-07 | 广州小鹏汽车科技有限公司 | Energy recovery method, energy recovery device, vehicle and storage medium |
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