阅读说明：本技术 电动汽车动力系统的整车能量管理方法及车辆 (Whole vehicle energy management method of electric vehicle power system and vehicle ) 是由 刘力源 于 2019-07-30 设计创作，主要内容包括：本发明实施例公开了一种电动汽车动力系统的整车能量管理方法及车辆。该方法包括：整车控制器接收所述动力电池组件反馈的当前动力电池温度；整车控制器将所述当前动力电池温度与预设的温度阈值进行比较,并根据比较结果确定电池使用模式；整车控制器根据获得的车辆当前工况确定所述车辆的当前需求功率,并根据所述当前需求功率对所述电池使用模式中的电池进行功率分配。本发明实施例上述方案解决了电动汽车采用单一动力电池供电所存在的弊端,有效地保证了整车在低温环境、高温环境等极限工况下的功率需求,在保证整车动力性和经济性的同时,也为动力电池提供了有效保护,延长了动力电池的使用寿命。(The embodiment of the invention discloses a whole vehicle energy management method of an electric vehicle power system and a vehicle. The method comprises the following steps: the vehicle control unit receives the current power battery temperature fed back by the power battery assembly; the vehicle control unit compares the current power battery temperature with a preset temperature threshold value, and determines a battery use mode according to a comparison result; and the vehicle control unit determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and performs power distribution on the battery in the battery use mode according to the current required power. The scheme of the embodiment of the invention solves the defects of the electric automobile powered by a single power battery, effectively ensures the power requirement of the whole automobile under the limit working conditions of low-temperature environment, high-temperature environment and the like, provides effective protection for the power battery while ensuring the dynamic property and the economical efficiency of the whole automobile, and prolongs the service life of the power battery.)

1. The whole vehicle energy management method of the electric vehicle power system is characterized in that the electric vehicle power system comprises the following steps: vehicle control unit, flywheel battery pack and power battery pack, the method includes:

the vehicle control unit receives the current power battery temperature fed back by the power battery assembly;

the vehicle control unit compares the current power battery temperature with a preset temperature threshold value, and determines a battery use mode according to a comparison result, wherein the battery use mode comprises the following steps: a flywheel battery pack priority mode and a power battery pack priority mode;

and the vehicle control unit determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and performs power distribution on the battery in the battery use mode according to the current required power.

2. The method of claim 1, wherein the electric vehicle power system further comprises: motor element, speed sensor, accelerator pedal and brake pedal, the vehicle current operating mode includes: the current motor rotating speed, the current accelerator pedal opening, the current brake pedal opening, the current accelerator pedal opening change rate and the current brake pedal opening change rate;

correspondingly, the vehicle control unit determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and the method comprises the following steps:

the vehicle control unit respectively receives the current motor rotating speed, the current accelerator pedal opening and the current brake pedal opening obtained by the rotating speed sensor, the accelerator pedal and the brake pedal;

the vehicle control unit respectively determines a current accelerator pedal opening degree change rate and a current brake pedal opening degree change rate according to the current accelerator pedal opening degree and the current brake pedal opening degree;

and the vehicle control unit determines the current required power according to the current motor rotating speed, the current accelerator pedal opening, the current brake pedal opening, the current accelerator pedal opening change rate and the current brake pedal opening change rate.

3. The method of claim 1, wherein the vehicle control unit power allocates the battery in the battery usage mode according to the current required power, comprising:

when the battery use mode is a flywheel battery assembly priority mode, the vehicle control unit performs first charge and discharge power distribution on a flywheel battery in the flywheel battery assembly and a power battery in the power battery assembly according to the current required power and a first power distribution strategy;

and when the battery use mode is a power battery assembly priority mode, the vehicle control unit performs second charge and discharge power distribution on a flywheel battery in the flywheel battery assembly and a power battery in the power battery assembly according to the current required power and a second power distribution strategy.

4. The method according to claim 3, wherein the vehicle control unit performs a first charge and discharge power distribution on the flywheel battery in the flywheel battery assembly and the power battery in the power battery assembly according to the current required power and in combination with a first power distribution strategy, and the method comprises the following steps:

the vehicle control unit judges the charge-discharge state of a flywheel battery in the flywheel battery assembly according to the opening degree of the accelerator pedal and the opening degree of the brake pedal;

and the vehicle control unit determines target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the flywheel battery and the current required power.

5. The method according to claim 4, wherein the determining, by the vehicle control unit, the target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the flywheel battery and the current required power comprises:

when the vehicle control unit determines that the flywheel battery enters a discharging state, if the current required power is smaller than or equal to the maximum discharging power of the flywheel battery, the vehicle control unit determines the current required power as the target discharging power of the flywheel battery and determines that the target discharging power of the power battery is 0;

if the current required power is larger than the maximum discharge power of the flywheel battery and is smaller than or equal to the sum of the maximum discharge power of the flywheel battery and the maximum discharge power of the power battery, determining the maximum discharge power of the flywheel battery as the target discharge power of the flywheel battery by the vehicle control unit, and determining the difference value between the current required power and the maximum discharge power of the flywheel battery as the target discharge power of the power battery;

and if the current required power is larger than the sum of the maximum discharging power of the flywheel battery and the maximum discharging power of the power battery, the vehicle control unit determines the maximum discharging power of the flywheel battery as the target discharging power of the flywheel battery, and determines the maximum discharging power of the power battery as the target discharging power of the power battery.

6. The method according to claim 4, wherein the determining, by the vehicle control unit, the target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the flywheel battery and the current required power comprises:

when the vehicle control unit determines that the flywheel battery enters a charging state, if the current required power is less than or equal to the maximum charging power of the flywheel battery, the vehicle control unit determines the current required power as the target charging power of the flywheel battery and determines that the target charging power of the power battery is 0;

if the current required power is larger than the maximum charging power of the flywheel battery and smaller than the sum of the maximum charging power of the flywheel battery and the maximum charging power of the power battery, the vehicle control unit determines the maximum charging power of the flywheel battery as the target charging power of the flywheel battery, and determines the difference value between the current required power and the maximum charging power of the flywheel battery as the target charging power of the power battery;

and if the current required power is larger than or equal to the sum of the maximum charging power of the flywheel battery and the maximum charging power of the power battery, the vehicle control unit determines the maximum charging power of the flywheel battery as the target charging power of the flywheel battery, and determines the maximum charging power of the power battery as the target charging power of the power battery.

7. The method according to claim 3, wherein the vehicle control unit performs a second charge and discharge power distribution on the flywheel battery in the flywheel battery assembly and the power battery in the power battery assembly according to the current required power and in combination with a second power distribution strategy, and the second charge and discharge power distribution method comprises the following steps:

the vehicle control unit judges the charge-discharge state of a power battery in the power battery assembly according to the opening degree of the accelerator pedal and the opening degree of the brake pedal;

and the vehicle control unit determines target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power.

8. The method according to claim 7, wherein the determining target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power comprises:

when the vehicle control unit determines that the power battery enters a discharging state, if the current required power is smaller than or equal to the maximum discharging power of the power battery, the vehicle control unit determines the current required power as the target discharging power of the power battery and determines that the target discharging power of the flywheel battery is 0;

if the current required power is larger than the maximum discharge power of the power battery and is smaller than or equal to the sum of the maximum discharge power of the flywheel battery and the maximum discharge power of the power battery, the vehicle control unit determines the maximum discharge power of the power battery as the target discharge power of the power battery, and determines the difference value between the current required power and the maximum discharge power of the power battery as the target discharge power of the flywheel battery;

and if the current required power is larger than the sum of the maximum discharging power of the flywheel battery and the power battery, the vehicle control unit determines the maximum discharging power of the power battery as the target discharging power of the power battery, and determines the maximum discharging power of the flywheel battery as the target discharging power of the power battery.

9. The method according to claim 7, wherein the determining target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power comprises:

when the vehicle control unit determines that the power battery enters a charging state, if the current required power is less than or equal to the maximum charging power of the power battery, the vehicle control unit determines the current required power as the target charging power of the power battery and determines that the target charging power of the flywheel battery is 0;

if the current required power is larger than the maximum charging power of the power battery and smaller than the sum of the maximum charging powers of the flywheel battery and the power battery, the vehicle control unit determines the maximum charging power of the power battery as the target charging power of the power battery, and determines the difference value between the current required power and the maximum charging power of the power battery as the target charging power of the flywheel battery;

and if the current required power is larger than or equal to the sum of the maximum charging powers of the flywheel battery and the power battery, the vehicle control unit determines the maximum charging power of the power battery as the target charging power of the power battery, and determines the maximum charging power of the flywheel battery as the target charging power of the power battery.

10. A vehicle, characterized by comprising: the system comprises a vehicle control unit, a flywheel battery assembly, a power battery assembly, an accelerator pedal, a brake pedal, a charging assembly, a motor assembly and a memory;

the vehicle control unit is respectively connected with the flywheel battery assembly, the power battery assembly, the accelerator pedal, the brake pedal, the charging assembly, the motor assembly and the memory, and is used for acquiring the working conditions of other assemblies and sending corresponding control instructions to other assemblies according to the working conditions so as to complete the management and distribution of the energy of the whole vehicle;

the memory for storing one or more programs;

the one or more programs are executed by the vehicle control unit such that the vehicle control unit implements the vehicle energy management method of any of claims 1-9.

Technical Field

The embodiment of the invention relates to the technical field of electric automobiles, in particular to a whole automobile energy management method of an electric automobile power system and an automobile.

Background

The electric automobile, especially the pure electric automobile, takes a vehicle-mounted power supply as power, and a power supply system is an important component of an electric automobile power system. Lithium power batteries are the mainstream power supply system of electric vehicles at present due to the advantages of high energy density, small environmental pollution and the like.

At present, a power supply system of an electric automobile mostly adopts a power supply scheme of a lithium power battery and other single power batteries.

Disclosure of Invention

The embodiment of the invention provides a whole vehicle energy management method of an electric vehicle power system and a vehicle, aiming at solving the defects of the electric vehicle powered by a single power battery, effectively protecting the power battery while ensuring the dynamic property and the economical efficiency of the whole vehicle and prolonging the service life of the power battery.

In a first aspect, an embodiment of the present invention provides a method for managing energy of an electric vehicle power system, where the electric vehicle power system includes: the method comprises the following steps:

the vehicle control unit receives the current power battery temperature fed back by the power battery assembly;

the vehicle control unit compares the current power battery temperature with a preset temperature threshold value, and determines a battery use mode according to a comparison result, wherein the battery use mode comprises the following steps: a flywheel battery pack priority mode and a power battery pack priority mode;

and the vehicle control unit determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and performs power distribution on the battery in the battery use mode according to the current required power.

Further, the electric automobile driving system also comprises: motor element, speed sensor, accelerator pedal and brake pedal, the vehicle current operating mode includes: the current motor rotating speed, the current accelerator pedal opening, the current brake pedal opening, the current accelerator pedal opening change rate and the current brake pedal opening change rate;

correspondingly, the vehicle control unit determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and the method comprises the following steps:

the vehicle control unit respectively receives the current motor rotating speed, the current accelerator pedal opening and the current brake pedal opening obtained by the rotating speed sensor, the accelerator pedal and the brake pedal;

the vehicle control unit respectively determines a current accelerator pedal opening degree change rate and a current brake pedal opening degree change rate according to the current accelerator pedal opening degree and the current brake pedal opening degree;

and the vehicle control unit determines the current required power according to the current motor rotating speed, the current accelerator pedal opening, the current brake pedal opening, the current accelerator pedal opening change rate and the current brake pedal opening change rate.

Further, the vehicle control unit performs power distribution on the battery in the battery usage mode according to the current required power, and the power distribution method includes:

when the battery use mode is a flywheel battery assembly priority mode, the vehicle control unit performs first charge and discharge power distribution on a flywheel battery in the flywheel battery assembly and a power battery in the power battery assembly according to the current required power and a first power distribution strategy;

and when the battery use mode is a power battery assembly priority mode, the vehicle control unit performs second charge and discharge power distribution on a flywheel battery in the flywheel battery assembly and a power battery in the power battery assembly according to the current required power and a second power distribution strategy.

Further, the vehicle control unit performs first charge and discharge power distribution on the flywheel battery in the flywheel battery assembly and the power battery in the power battery assembly according to the current required power and a first power distribution strategy, and includes:

the vehicle control unit judges the charge-discharge state of a flywheel battery in the flywheel battery assembly according to the opening degree of the accelerator pedal and the opening degree of the brake pedal;

and the vehicle control unit determines target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the flywheel battery and the current required power.

Further, the vehicle control unit determines target charge and discharge power of the flywheel battery and the power battery according to the charge and discharge state of the flywheel battery and the current required power, and the method comprises the following steps:

when the vehicle control unit determines that the flywheel battery enters a discharging state, if the current required power is smaller than or equal to the maximum discharging power of the flywheel battery, the vehicle control unit determines the current required power as the target discharging power of the flywheel battery and determines that the target discharging power of the power battery is 0;

if the current required power is larger than the maximum discharge power of the flywheel battery and is smaller than or equal to the sum of the maximum discharge power of the flywheel battery and the maximum discharge power of the power battery, determining the maximum discharge power of the flywheel battery as the target discharge power of the flywheel battery by the vehicle control unit, and determining the difference value between the current required power and the maximum discharge power of the flywheel battery as the target discharge power of the power battery;

and if the current required power is larger than the sum of the maximum discharging power of the flywheel battery and the maximum discharging power of the power battery, the vehicle control unit determines the maximum discharging power of the flywheel battery as the target discharging power of the flywheel battery, and determines the maximum discharging power of the power battery as the target discharging power of the power battery.

Further, the vehicle control unit determines target charge and discharge power of the flywheel battery and the power battery according to the charge and discharge state of the flywheel battery and the current required power, and the method comprises the following steps:

when the vehicle control unit determines that the flywheel battery enters a charging state, if the current required power is less than or equal to the maximum charging power of the flywheel battery, the vehicle control unit determines the current required power as the target charging power of the flywheel battery and determines that the target charging power of the power battery is 0;

if the current required power is larger than the maximum charging power of the flywheel battery and smaller than the sum of the maximum charging power of the flywheel battery and the maximum charging power of the power battery, the vehicle control unit determines the maximum charging power of the flywheel battery as the target charging power of the flywheel battery, and determines the difference value between the current required power and the maximum charging power of the flywheel battery as the target charging power of the power battery;

and if the current required power is larger than or equal to the sum of the maximum charging power of the flywheel battery and the maximum charging power of the power battery, the vehicle control unit determines the maximum charging power of the flywheel battery as the target charging power of the flywheel battery, and determines the maximum charging power of the power battery as the target charging power of the power battery.

Further, the vehicle control unit performs second charge and discharge power distribution on the flywheel battery in the flywheel battery assembly and the power battery in the power battery assembly according to the current required power and a second power distribution strategy, and the second charge and discharge power distribution method includes:

the vehicle control unit judges the charge-discharge state of a power battery in the power battery assembly according to the opening degree of the accelerator pedal and the opening degree of the brake pedal;

and the vehicle control unit determines target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power.

Further, the determining the target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power comprises:

when the vehicle control unit determines that the power battery enters a discharging state, if the current required power is smaller than or equal to the maximum discharging power of the power battery, the vehicle control unit determines the current required power as the target discharging power of the power battery and determines that the target discharging power of the flywheel battery is 0;

if the current required power is larger than the maximum discharge power of the power battery and is smaller than or equal to the sum of the maximum discharge power of the flywheel battery and the maximum discharge power of the power battery, the vehicle control unit determines the maximum discharge power of the power battery as the target discharge power of the power battery, and determines the difference value between the current required power and the maximum discharge power of the power battery as the target discharge power of the flywheel battery;

and if the current required power is larger than the sum of the maximum discharging power of the flywheel battery and the power battery, the vehicle control unit determines the maximum discharging power of the power battery as the target discharging power of the power battery, and determines the maximum discharging power of the flywheel battery as the target discharging power of the power battery.

Further, the determining the target charge-discharge power of the flywheel battery and the power battery according to the charge-discharge state of the power battery and the current required power comprises:

when the vehicle control unit determines that the power battery enters a charging state, if the current required power is less than or equal to the maximum charging power of the power battery, the vehicle control unit determines the current required power as the target charging power of the power battery and determines that the target charging power of the flywheel battery is 0;

if the current required power is larger than the maximum charging power of the power battery and smaller than the sum of the maximum charging powers of the flywheel battery and the power battery, the vehicle control unit determines the maximum charging power of the power battery as the target charging power of the power battery, and determines the difference value between the current required power and the maximum charging power of the power battery as the target charging power of the flywheel battery;

and if the current required power is larger than or equal to the sum of the maximum charging powers of the flywheel battery and the power battery, the vehicle control unit determines the maximum charging power of the power battery as the target charging power of the power battery, and determines the maximum charging power of the flywheel battery as the target charging power of the power battery.

In a second aspect, an embodiment of the present invention further provides a vehicle, including: the system comprises a vehicle control unit, a flywheel battery assembly, a power battery assembly, an accelerator pedal, a brake pedal, a charging assembly, a motor assembly and a memory;

the vehicle control unit is respectively connected with the flywheel battery assembly, the power battery assembly, the accelerator pedal, the brake pedal, the charging assembly, the motor assembly and the memory, and is used for acquiring the working conditions of other assemblies and sending corresponding control instructions to other assemblies according to the working conditions so as to complete the management and distribution of the energy of the whole vehicle;

the memory for storing one or more programs;

the one or more programs are executed by the vehicle control unit, so that the vehicle control unit implements the vehicle energy management method according to the first aspect of the embodiment of the invention.

On the basis of providing an electric vehicle power system compositely powered by a flywheel battery and a power battery, the embodiment of the invention solves the defects of the electric vehicle powered by a single power battery by setting two battery use modes, namely a flywheel battery priority mode and a power battery priority mode and selecting the battery use mode based on the temperature of the power battery, thereby effectively ensuring the power requirements of the whole vehicle under the extreme working conditions of low-temperature environment, high-temperature environment and the like, effectively protecting the power battery while ensuring the power performance and the economical efficiency of the whole vehicle, and prolonging the service life of the power battery.

Drawings

Fig. 1 is a schematic flowchart of a method for managing energy of a whole electric vehicle power system according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a method for managing energy of a whole electric vehicle power system according to a second embodiment of the present invention;

fig. 3 is a schematic flow chart illustrating that the vehicle control unit determines target charge/discharge powers of the flywheel battery and the power battery in the flywheel battery assembly priority mode according to the second embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating that the vehicle control unit determines target charge/discharge powers of the flywheel battery and the power battery in the priority mode of the power battery assembly according to the second embodiment of the present invention;

fig. 5 is a schematic structural diagram of a vehicle according to a third embodiment of the present invention;

fig. 6 is an exemplary diagram of an electric vehicle power system according to a fourth embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.