阅读说明：本技术 一种氢能汽车动力系统及其能量管理方法 (Hydrogen energy automobile power system and energy management method thereof ) 是由 严习胜 郝义国 于 2019-08-14 设计创作，主要内容包括：本发明提供一种氢能汽车动力系统及其能量管理方法,所述动力系统包括氢燃料电池系统、整车驱动子系统、动力电池子系统以及高压附件子系统,所述能量管理方法为：S1、根据当前动力电池的SOC值调节氢能汽车的能量流向模式；S2、根据能量流向模式,整车控制器控制驱动电机扭矩输出以及氢燃料电池系统的功率输出；S3、回到步骤S1,通过对动力电池SOC的循环控制实现能量管理。本发明的有益效果：在由氢燃料电池提供电能的汽车上,整车控制器通过控制驱动电机扭矩输出以及氢燃料电池系统的输出功率来实现整车动力系统的能量传输方向,始终维持动力电池SOC稳定在一定区间范围内,满足使用需求的同时尽可能节能减排。(The invention provides a hydrogen energy automobile power system and an energy management method thereof, wherein the power system comprises a hydrogen fuel cell system, an entire automobile driving subsystem, a power cell subsystem and a high-voltage accessory subsystem, and the energy management method comprises the following steps: s1, adjusting the energy flow mode of the hydrogen energy automobile according to the SOC value of the current power battery; s2, controlling the torque output of the driving motor and the power output of the hydrogen fuel cell system by the vehicle control unit according to the energy flow direction mode; and S3, returning to the step S1, and realizing energy management through the circulation control of the power battery SOC. The invention has the beneficial effects that: on an automobile powered by a hydrogen fuel cell, the whole automobile controller controls the torque output of a driving motor and the output power of a hydrogen fuel cell system to realize the energy transmission direction of a whole automobile power system, always maintains the SOC of a power battery to be stable in a certain interval range, meets the use requirement and simultaneously saves energy and reduces emission as far as possible.)

1. A hydrogen energy automobile power system is characterized by comprising a hydrogen fuel cell system, a whole automobile driving subsystem, a power cell subsystem and a high-voltage accessory subsystem, wherein the power cell subsystem comprises a power cell, the power cell has a charge and discharge function, and the power cell and the hydrogen fuel cell system provide energy for a hydrogen energy automobile; the whole vehicle driving subsystem comprises a driving motor, the driving motor and the high-voltage accessory subsystem consume energy to realize vehicle running, and the driving motor is also in an energy recovery state; and the power system is subjected to energy management by the vehicle control unit.

2. A method for managing energy of a power system of a hydrogen vehicle, which is characterized by adopting the power system of claim 1, and comprises the following steps:

s1, adjusting the current energy flow mode of the hydrogen energy automobile according to the SOC value of the current power battery;

s2, controlling the torque output of the driving motor and the power output of the hydrogen fuel cell system by the vehicle control unit according to the current energy flow direction mode;

and S3, returning to the step S1, and realizing energy management through the circulation control of the power battery SOC.

3. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 2, wherein in step S1, the control interval of the SOC of the power battery is 35% to 75% of the battery after calibration.

4. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 2, wherein in step S1, the energy flow of the hydrogen-powered vehicle is divided into the following modes:

mode 1: the power battery discharges, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor consumes energy;

mode 2: discharging the power battery, discharging the hydrogen fuel cell system, consuming energy by the high-voltage accessory subsystem, and driving the motor to recover energy;

mode 3: charging a power battery, discharging a hydrogen fuel cell system, consuming energy by a high-voltage accessory subsystem, and consuming energy by a driving motor;

mode 4: the power battery is charged, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor recovers energy.

5. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 2 or 3, characterized in that in step S1, when the SOC value is between 55% and 75%, the current energy flow is adjusted to be mode 1 or mode 2, and mode 1 or mode 2 is selected by the current driver' S operation; when the SOC value is between 35% and 55%, the current energy flow is adjusted to be mode 3 or mode 4, and mode 3 or mode 4 is selected by the current driver's operation.

6. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 2 or 4, wherein in the step S2, when the energy flow determined in the step S1 is in the mode 1 or the mode 2, the vehicle control unit limits the recovered power of the driving motor while reducing the output power of the hydrogen fuel cell system; when the energy flow determined in step S2 is in mode 3 or mode 4, the vehicle control unit limits the driving power of the driving motor while increasing the output power of the hydrogen fuel cell system.

7. The energy management method of the hydrogen energy automobile power system according to claim 2 or 6, wherein in the step S2, when the driving motor is in a consumption state, the minimum value of the sum P11 of the power output of the power battery and the actual output power of the hydrogen fuel cell system, the maximum output power limit P12 of the driving motor and the vehicle power limit requirement P13 is the maximum driving power of the driving motor, and the vehicle controller limits the driving power of the current driving motor by using the maximum driving power of the driving motor; when the driving motor is in a recovery state, the minimum value of the difference P21 between the chargeable power of the power battery and the lowest idle output power of the hydrogen fuel cell system, the maximum feedback power limit of the driving motor per se is P22, and the finished vehicle power limit demand P23 is the maximum recovery power of the driving motor, and the finished vehicle controller limits the driving power of the current driving motor by using the maximum recovery power of the driving motor.

8. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 2 or 6, wherein in step S2, the maximum outputtable power of the hydrogen fuel cell system is P31, the actual power of the driving motor is P32, the sum of the power consumptions of the high-voltage accessory subsystems is P33, the battery required charging power is P34, the required power of the vehicle under special operating conditions is P35, the maximum recoverable power of the power battery is P36, the values of P32+ P33+ P34 and P35 are P _ max, the minimum value of the larger values of P _ max, P31 and P36+ P32+ P33 is taken as the output power of the hydrogen fuel cell system, and the vehicle controller limits the current hydrogen fuel cell system according to the output power of the hydrogen fuel cell system.

9. The energy management method of the power system of the hydrogen-powered vehicle as claimed in claim 8, wherein when the driving motor is in a consumption state, the actual power P32 of the driving motor is the output power of the driving motor, and the value is a positive number; when the driving motor is in a recovery state, the actual power P32 of the driving motor is the recovery power of the driving motor, and the value is a negative number.

Technical Field

The invention relates to the field of battery energy management, in particular to a hydrogen energy automobile power system and an energy management method thereof.

Background

With the rapid development of the new energy automobile industry, fuel cell automobiles become important components in new energy automobile doors, and the fuel cell automobile industry is one of the industries which are mainly supported and promoted in the coming years in China. Today, with the increasingly prominent energy problem, how to make new energy vehicles, especially hydrogen fuel cell vehicles, meet the use requirements of consumers and simultaneously save energy as much as possible is undoubtedly the research focus of technicians in the industry.

Disclosure of Invention

In an automobile powered by a hydrogen fuel cell, a Vehicle Control Unit (VCU) controls torque output of a driving motor and output power of the hydrogen fuel cell system to realize energy transmission management of the vehicle power system.

The invention provides a hydrogen energy automobile power system and an energy management method thereof, wherein the power system comprises a hydrogen fuel cell system, an entire automobile driving subsystem, a power cell subsystem and a high-voltage accessory subsystem, wherein the power cell subsystem comprises a power cell, the power cell has a charge and discharge function, and the power cell and the hydrogen fuel cell system provide energy for a hydrogen energy automobile; the whole vehicle driving subsystem comprises a driving motor, the driving motor and the high-voltage accessory subsystem consume energy to realize vehicle running, and the driving motor is also in an energy recovery state; and the power system is subjected to energy management by the vehicle control unit.

The energy management method comprises the following steps of firstly, dividing an energy flow direction mode of a power system:

mode 1: the power battery discharges, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor consumes energy;

mode 2: discharging the power battery, discharging the hydrogen fuel cell system, consuming energy by the high-voltage accessory subsystem, and driving the motor to recover energy;

mode 3: charging a power battery, discharging a hydrogen fuel cell system, consuming energy by a high-voltage accessory subsystem, and consuming energy by a driving motor;

mode 4: the power battery is charged, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor recovers energy.

According to the SOC value of the current power battery, the VCU performs energy management by controlling the output torque of the driving motor and the output power of the hydrogen fuel cell system: when the SOC value is between 55% and 75%, the current energy flow is regulated to be in a mode 1 or a mode 2, the VCU limits the recovery power of the driving motor, and meanwhile, the output power of the hydrogen fuel cell system is reduced moderately; when the SOC value is between 35% and 55%, the current energy flow is adjusted to be mode 3 or mode 4, and the VCU limits the driving power of the driving motor while increasing the output power of the hydrogen fuel cell system.

Further, the control interval of the power battery SOC is 35% 75% after calibration, and the VCU manages the energy flow direction to ensure that the power battery SOC value is in the interval for a long time.

Further, when the driving motor is in a consumption state, the minimum value of the sum P11 of the output power of the power battery and the actual output power of the hydrogen fuel cell system, the maximum output power limit P12 of the driving motor and the finished automobile power limit requirement P13 is taken as the maximum driving power of the driving motor, and the finished automobile controller limits the driving power of the current driving motor by using the maximum driving power of the driving motor; when the driving motor is in a recovery state, the minimum value of the difference P21 between the chargeable power of the power battery and the lowest output idle power of the hydrogen fuel cell system, the maximum feedback power limit of the driving motor per se is P22, and the finished vehicle power limit demand P23 is the maximum recovery power of the driving motor, and the finished vehicle controller limits the driving power of the current driving motor by using the maximum recovery power of the driving motor.

Further, the maximum output power of the hydrogen fuel cell system is P31, the actual output power of the driving motor is P32, the sum of the consumed power of the high-voltage accessory subsystems is P33, the required charging power of the battery is P34, the required power of the whole vehicle under special working conditions is P35, the maximum recoverable power of the power battery is P36, the larger value of the P32+ P33+ P34 and the P35 is P _ max, the minimum value of the P _ max, the P31, the P36+ P32+ P33 is taken as the output power of the hydrogen fuel cell system, and the whole vehicle controller limits the current hydrogen fuel cell system according to the output power of the hydrogen fuel cell system.

Further, when the driving motor is in a consumption state, the actual power P32 of the driving motor is the output power of the driving motor, and the value is a positive number; when the driving motor is in a recovery state, the actual power P32 of the driving motor is the recovery power of the driving motor, and the value is a negative number.

The technical scheme provided by the invention has the beneficial effects that: on an automobile powered by a hydrogen fuel cell, the VCU controls the torque output of a driving motor and the output power of a hydrogen fuel cell system to realize the energy transmission direction of a complete automobile power system, always maintains the SOC of the power cell to be stable in a certain interval range, meets the use requirement and simultaneously saves energy and reduces emission as far as possible.

Drawings

Fig. 1 is a schematic energy flow diagram of a hydrogen energy automobile power system and an energy management method thereof according to an embodiment of the present invention.

FIG. 2 is a process of calculating the maximum driving power of the driving motor of the power system of the hydrogen vehicle and the energy management method thereof according to the embodiment of the invention;

FIG. 3 is a calculation process of maximum recovered power of a driving motor of a hydrogen energy automobile power system and an energy management method thereof according to an embodiment of the present invention;

FIG. 4 is a process of calculating the output power of a hydrogen fuel cell system of a hydrogen-powered vehicle power system and an energy management method thereof according to an embodiment of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a power system of a hydrogen energy automobile, where the power system includes a hydrogen fuel cell system, a vehicle driving subsystem, a power cell subsystem, and a high-voltage accessory subsystem, where the power cell subsystem includes a power cell, the power cell has a charging and discharging function, and the power cell and the hydrogen fuel cell system provide energy for the hydrogen energy automobile; the whole vehicle driving subsystem comprises a driving motor, the driving motor and the high-voltage accessory subsystem consume energy to realize vehicle running, and the driving motor is also in an energy recovery state; the powertrain is energy managed by a Vehicle Control Unit (VCU).

The embodiment of the invention also provides an energy management method of the power system of the hydrogen energy automobile, which comprises the following steps:

s1, adjusting the current energy flow mode of the hydrogen energy automobile according to the SOC (State of Charge) value of the current power battery;

the energy flow of the hydrogen energy automobile is divided into the following modes:

mode 1: the power battery discharges, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor consumes energy;

mode 2: discharging the power battery, discharging the hydrogen fuel cell system, consuming energy by the high-voltage accessory subsystem, and driving the motor to recover energy;

mode 3: charging a power battery, discharging a hydrogen fuel cell system, consuming energy by a high-voltage accessory subsystem, and consuming energy by a driving motor;

mode 4: the power battery is charged, the hydrogen fuel cell system discharges, the high-voltage accessory subsystem consumes energy, and the driving motor recovers energy.

Preferably, the control interval of the power battery SOC is 35% to 75%, the interval is a value after battery calibration, and the VCU controls energy transfer of the power system to ensure that the power battery SOC is in the control interval for a long time. Specifically, when the SOC value is between 55% and 75%, for example, 70%, the current energy flow is adjusted to be mode 1 or mode 2; when the SOC value is between 35% and 55%, for example, 40%, the current energy flow is adjusted to be mode 3 or mode 4. It should be noted that the difference between the modes 1 and 2 is that the operating state of the driving motor is different, and the current operating state of the driving motor depends on the operation of the driver, for example, in the case of a high vehicle speed, the driving motor is in the recovery state when the driver does not step on the accelerator, the driving motor is in the consumption state after stepping on the accelerator, and the modes 3 and 4 are also the same.

S2, the VCU controls the drive motor torque output and the power output of the hydrogen fuel cell system according to the current energy flow mode.

When the energy flow determined in step S1 is in mode 1 or mode 2, the VCU limits the recovered power of the drive motor while reducing the output power of the hydrogen fuel cell system; when the energy flow determined in step S2 is in mode 3 or mode 4, the VCU limits the drive power of the drive motor while increasing the output power of the hydrogen fuel cell system.

When the driving motor is in a consumption state, please refer to fig. 2, the sum of the output power of the power battery and the actual output power of the hydrogen fuel cell system is P11, the maximum output power of the driving motor is limited to P12, the total power limiting requirement is P13, the minimum value of P11, P12 and P13 is taken as the maximum driving power of the driving motor, and the VCU limits the driving power of the current driving motor by using the maximum driving power of the driving motor; the output power of the power battery refers to the maximum dischargeable power of the power battery; the actual output power of the hydrogen fuel cell system refers to the power actually output after responding to the power request of the VCU in the operation of the hydrogen fuel cell, and is an amount that varies according to the actual demand; the maximum output power limit P12 of the driving motor refers to the maximum power of the driving motor which can drive the whole vehicle according to the actual situation; the power limitation requirement P13 refers to the power limitation of the driving motor when the vehicle needs to be limited for a specific reason, such as a serious failure of the vehicle or a specific condition.

When the driving motor is in a recycling state, please refer to fig. 3, the difference between the chargeable power of the power battery and the lowest idle output power of the hydrogen fuel cell system is P21, the maximum feedback power limit of the driving motor is P22, the total power limit requirement is P23, the minimum value among P21, P22 and P23 is taken as the maximum recycling power of the driving motor, and the VCU limits the driving power of the current driving motor by using the maximum recycling power of the driving motor; the chargeable power of the power battery refers to power limitation caused by the fact that the power battery protects self charging according to the self state in the actual running of the vehicle, namely the maximum power of the power battery which can run and be externally charged; the lowest idling output power of the hydrogen fuel cell system refers to the lowest power which can be output when a galvanic pile works, which is caused by the technical bottleneck of the galvanic pile of the hydrogen fuel cell at present; the maximum feedback power limit P22 of the driving motor refers to the maximum power generation power of the motor for energy recovery; the overall vehicle power limit requirement P23 is the same as P13.

Referring to fig. 4, let the maximum output power of the hydrogen fuel cell system be P31, the actual power of the driving motor be P32, the sum of the power consumptions of the high-voltage accessory subsystems be P33, the battery required charging power be P34, the required power of the special operating conditions (such as rapid acceleration and emergency braking) of the entire vehicle be P35, the maximum recoverable power of the power battery be P36, let the larger value of P32+ P33+ P34 and P35 be P _ max, take the minimum value of P _ max, P31 and P36+ P32+ P33 as the output power of the hydrogen fuel cell system, and the VCU limits the current hydrogen fuel cell system according to the output power of the hydrogen fuel cell system; wherein, the maximum outputtable power P31 of the hydrogen fuel cell system refers to the maximum power that the hydrogen fuel cell can provide according to the current stack environment; the actual power P32 of the driving motor refers to the rated power of the driving motor in actual operation at present, when the driving motor is in a consumption state, the P32 is a positive number, and when the driving motor is in a recovery state, the P32 is a negative number; the sum P33 of the consumed power of the high-voltage accessory subsystems refers to the sum of the power actually consumed by high-voltage accessories such as a current voltage charging DC-DC, a high-voltage PTC heater, a high-voltage air conditioner compressor and the like; the battery required charging power P34 means that the VCU considers the power requirement of the power battery according to the current power battery SOC value, the higher SOC value is considered to have a discharging requirement, the P34 is a negative number, the lower SOC value is considered to have a charging requirement, and the P34 is a positive number; the required power P35 of the special working condition of the whole vehicle refers to the requirement that the VCU has rapid power increase on the hydrogen fuel cell according to the special working condition, such as the rapid acceleration of a driver; the maximum recoverable power P36 of the power battery refers to the maximum power limit at which the power battery can recover energy by itself.

And S3, returning to the step S1 again, and realizing energy management through the circulation control of the power battery SOC.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.