Passenger car fuel cell system energy management control method and system

Abstract

The invention belongs to the technical field of energy management and control, and provides an energy management and control method and system for a passenger car fuel cell system, when the power of a fuel cell is not less than the required power of the whole car, the power of the fuel cell only needs to meet the maximum value not less than the required power of the whole car, and the electric energy of the fuel cell is firstly supplied to the required power of the whole car; redundant electric energy is transmitted to the power battery; when the power of the fuel cell is smaller than the required power of the whole vehicle, the power of the fuel cell only needs to be smaller than the minimum value of the required power of the whole vehicle, all electric energy of the fuel cell is used up, and other energy is provided by the power cell. The influence of different working conditions and environments on the power of the fuel cell and the required power of the whole vehicle is considered, and the power of the whole vehicle does not only take a motor as an example, but also takes energy distribution into consideration, so that the energy distribution is more reasonable, the size and the weight of the power cell are further reduced, and the power of power accessories is considered. And the stability of the SOC of the power battery is maintained through joint participation of multiple factors.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy management control, and in particular relates to an energy management control method and system for a fuel cell system of a bus. Background Art

[0002] At present, fuel cell vehicles are developing rapidly. Fuel cells, as the primary energy source of the entire vehicle, abandon large-capacity power batteries and adopt a dual energy source of fuel cells + power batteries. When the fuel cell energy is insufficient, the power battery is used for power supply. Under this condition, small power batteries can be used to reduce the cost of power batteries and the entire vehicle.

[0003] The driving conditions of buses are constantly changing. Taking into account the actual driving conditions, the motor and vehicle accessories are not taken into account when evaluating the relationship between the fuel cell power and the required power of the whole vehicle. The energy cannot be analyzed comprehensively and fully, resulting in unstable range of changes in the power battery charging and discharging state, and large changes in the power battery power, which is not conducive to maintaining the energy distribution of the whole vehicle. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a bus fuel cell system energy management control method and system. The present invention takes into account the influence of different working conditions and environments on the fuel cell power and the power demand of the whole vehicle. The power of the whole vehicle is no longer just based on the motor as an example, but the energy distribution is taken into consideration at the same time, making the energy distribution more reasonable, thereby further reducing the size and weight of the power battery. The consideration of the power of the power accessories maintains the stability of the power battery SOC through the participation of multiple factors.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a method for controlling energy management of a fuel cell system of a bus, comprising:

[0007] Obtaining the required power of the entire bus under different working conditions; wherein the required power of the entire bus includes the motor power and the integrated power accessory power;

[0008] Determine the relationship between the vehicle power requirement and the fuel cell power. When the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement. The electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is delivered to the power battery. When the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement. The electric energy of the fuel cell is fully used, and the rest of the energy is provided by the power battery.

[0009] Furthermore, the operating conditions include acceleration state, constant speed state, deceleration state and parking state; in the constant speed state, the power demand of the whole vehicle remains unchanged; in the acceleration state, the power demand of the whole vehicle increases; in the deceleration or parking state, the power demand of the whole vehicle decreases.

[0010] Furthermore, the power demand of the whole vehicle is the sum of the motor power, air conditioning power, defrost power and heater power.

[0011] Furthermore, the motor power is:

[0012] P 电机 =T*n / 9550;

[0013] v=0.377rn / i g i0;

[0014] Where T is torque; n is speed; v is vehicle speed; r is wheel radius; n is engine speed; i g is the transmission ratio of the transmission; i0 is the transmission ratio of the main reducer.

[0015] Furthermore, when the motor power is in [0, 0.4]*P min In the range, the power battery SOC is at 0.3B, and the fuel cell power is at 0.8A; among them, P min is the minimum power required by the vehicle; A is the rated power of the fuel cell; B is the full power of the power battery;

[0016] When the motor power is in [0.4, 0.6]*P min Within the range, the power battery SOC is at 0.5B and the fuel cell power is at 0.7A;

[0017] Level 3: When the motor power is [0.6*P min , P max ] range, the power battery SOC is at 0.7B, and the fuel cell power is at 0.4A; among them, P max It is the maximum power required by the vehicle.

[0018] Furthermore, the maximum power required by the whole vehicle represents the power when the motor, air conditioning, defrosting and heating are all working.

[0019] In a second aspect, the present invention further provides an energy management control system for a bus fuel cell system, comprising:

[0020] The data acquisition module is configured to: obtain the vehicle power requirement of the bus under different working conditions; wherein the vehicle power requirement includes the motor power and the integrated power accessory power;

[0021] The management module is configured to: determine the relationship between the vehicle power requirement and the fuel cell power; when the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement, and the electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is transmitted to the power battery; when the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement, and all the electric energy of the fuel cell is used up, and the rest of the energy is provided by the power battery.

[0022] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the bus fuel cell system energy management control method described in the first aspect.

[0023] In a fourth aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the program, the steps of the bus fuel cell system energy management control method described in the first aspect are implemented.

[0024] In a fifth aspect, the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the bus fuel cell system energy management control method described in the first aspect are implemented.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] When determining the power demand of the whole vehicle, the present invention takes the motor power and the integrated power accessory power into consideration, and performs energy management by judging the relationship between the power demand of the whole vehicle and the power of the fuel cell. Specifically, when the power of the fuel cell is not less than the power demand of the whole vehicle, the power of the fuel cell only needs to meet the maximum value of not less than the power demand of the whole vehicle, and the electric energy of the fuel cell first supplies the power demand of the whole vehicle, and the excess electric energy is delivered to the power battery; when the power of the fuel cell is less than the power demand of the whole vehicle, the power of the fuel cell only needs to meet the minimum value less than the power demand of the whole vehicle, and the electric energy of the fuel cell is fully used, and the rest of the energy is provided by the power battery. The different working conditions and environments are taken into consideration, and the influence on the power of the fuel cell and the power demand of the whole vehicle is also taken into consideration, and the power of the whole vehicle is no longer just taken as an example of the motor, but the energy distribution is taken into consideration at the same time, so that the energy distribution is more reasonable, so that the size and weight of the power battery can be further reduced, and the consideration of the power of the power accessory maintains the stability of the power battery SOC through the participation of multiple factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0028] Figure 1 This is a system schematic diagram of Embodiment 1 of the present invention;

[0029] Figure 2 This is a flow chart of the method of Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] Embodiment 1:

[0033] The driving conditions of buses will not remain unchanged, but will be in constant change. Taking into account the actual driving conditions, evaluate the relationship between the fuel cell power and the required power of the whole vehicle, that is, consider the motor and the accessories of the whole vehicle, and analyze the energy management control more comprehensively and fully; maintaining the power battery SOC in a stable range of change is the primary task, the fuel cell power can basically cover the power of the whole vehicle, and the power battery power changes less. At the same time, applying the driving conditions to the fuel cell system is conducive to maintaining the energy distribution of the whole vehicle. Based on this, this embodiment provides a bus fuel cell system energy management control method, which can integrate the driving conditions into the fuel cell power transmission process and further optimize the energy configuration of the whole vehicle. The method includes:

[0034] Obtaining the required power of the entire bus under different working conditions; wherein the required power of the entire bus includes the motor power and the integrated power accessory power;

[0035] Determine the relationship between the vehicle power requirement and the fuel cell power. When the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement. The electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is delivered to the power battery. When the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement. The electric energy of the fuel cell is fully used, and the rest of the energy is provided by the power battery.

[0036] Specifically, the motor power and the integrated power accessory power are taken into account, and energy management is performed by judging the relationship between the vehicle's required power and the fuel cell power. Specifically, when the fuel cell power is not less than the vehicle's required power, the fuel cell power only needs to meet the maximum value of not less than the vehicle's required power. The fuel cell's electric energy first supplies the vehicle's required power, and the excess electric energy is delivered to the power battery; when the fuel cell power is less than the vehicle's required power, the fuel cell power only needs to meet the minimum value of less than the vehicle's required power. The fuel cell's electric energy is fully used, and the rest of the energy is provided by the power battery. The different working conditions and environments are taken into account, and the impact on the fuel cell power and the vehicle's required power is considered. The vehicle power is no longer just based on the motor as an example, but energy distribution is taken into account at the same time, making the energy distribution more reasonable, so that the size and weight of the power battery can be further reduced. The consideration of the power of the power accessories maintains the stability of the power battery SOC through the participation of multiple factors.

[0037] In order to implement the management control method in this embodiment, Figure 1 As shown, this embodiment also provides a vehicle-level fuel cell system energy management control system, including a vehicle controller, a fuel cell controller, an integrated power supply controller, and a power battery management system, wherein:

[0038] The fuel cell controller receives control instructions from the vehicle controller, matches the appropriate fuel cell output power according to the power battery charge and discharge state (State of Charge, SOC), and transmits the signal to the vehicle controller. The vehicle controller controls the fuel cell controller to emit corresponding power, thereby further controlling the fuel cell.

[0039] The vehicle controller determines the power of the vehicle according to different driving conditions. The motor controller transmits the motor information to the vehicle controller. The integrated power controller transmits the air conditioning, defrosting and heating status information to the vehicle controller. The vehicle controller serves as the central control unit to uniformly regulate all components of the vehicle.

[0040] The power battery management system, based on the corresponding control instructions of the vehicle controller and combined with the fuel cell power and the vehicle's required power, supplements the required power when the fuel cell is not started or when the fuel cell power is less than the vehicle's required power. The power battery controller then feeds this power back to the vehicle controller.

[0041] The integrated power supply controller controls the status of the air conditioning, defrosting and heating contactors according to the operation of the vehicle and the driving requirements. The integrated power supply controller executes the commands of the vehicle controller and sends the status of the internal contactors of the integrated power supply to the vehicle controller.

[0042] Optionally, the driving conditions include acceleration, constant speed, deceleration and parking. In the constant speed state, the power demand of the whole vehicle remains unchanged; in the acceleration state, the power demand of the whole vehicle increases; in the deceleration or parking state, the power demand of the whole vehicle decreases.

[0043] Optionally, the vehicle speed sensor on the wheel can sense the current vehicle speed v. Taking the vehicle controller operation cycle of 20ms as an example, by comparing the vehicle speeds in the previous and next cycles, the specific driving conditions of the vehicle can be determined, which further affects the vehicle's required power. The vehicle speed v is sensed by the sensor, and according to v = 0.377rn / i g i0 can then be used to deduce the motor speed n from the vehicle speed v.

[0044] Where v is the vehicle speed; r is the wheel radius; n is the engine speed; i g is the transmission ratio of the transmission; i0 is the transmission ratio of the main reducer.

[0045] The power required by the vehicle includes the motor power and the integrated power accessory power. The integrated power accessory power includes the air conditioning power, the defrosting power, and the heating power. The motor power includes the power generation power and the braking energy recovery power, namely:

[0046] P=P motor + P integration = P motor + P air conditioning + P defrost + P warm air;

[0047] Among them, P 电机 Represents motor power; P 集成 Represents the integrated power supply power; P 空调 Represents air conditioning power; P 除霜 Represents defrost power; P 暖风 Indicates the heating power.

[0048] The MAP diagram of speed n-torque T can be obtained according to the motor bench test. In this way, under the premise of knowing the torque T and speed n, according to P 电机 =T*n / 9550, we can get the motor power P 电机 .

[0049] Determine the relationship between the vehicle's required power and the fuel cell power:

[0050] Among them, when the fuel cell power ≥ the vehicle's required power, it is only necessary to satisfy the maximum value of the fuel cell power ≥ the vehicle's required power. In this case, the fuel cell's electric energy first supplies the vehicle's required power, and the excess electric energy is delivered to the power battery;

[0051] When the fuel cell power is less than the vehicle's required power, it is sufficient to meet the minimum value of the fuel cell power less than the vehicle's required power. In this case, all the electrical energy of the fuel cell is used up, and the remaining energy is provided by the power battery.

[0052] The maximum power required by the vehicle is derived as P max , P max Represents the power of the motor, air conditioning, defrosting, and heating when all are working:

[0053] P max =P 电机 +P 集成 =P 电机 +P 空调 +P 除霜 +P 暖风 ;

[0054] The minimum power required by the vehicle is P min , P min Represents the power when the motor is working and the air conditioner, defrost and heater are all turned off, P min =P 电机 .

[0055] Furthermore, assuming that the rated power of the fuel cell is A and the full charge of the power battery is B, the power required for the vehicle [P min ,P max ] and fuel cell power and power battery SOC are divided into three levels:

[0056] Among them, the first level: when the motor power is [0, 0.4]*P min Within the range, the power battery SOC is at 0.3B and the fuel cell power is at 0.8A;

[0057] Second level: When the motor power is [0.4, 0.6]*P min Within the range, the power battery SOC is at 0.5B and the fuel cell power is at 0.7A;

[0058] Level 3: When the motor power is [0.6*P min , P max ] range, the power battery SOC is at 0.7B and the fuel cell power is at 0.4A.

[0059] In some embodiments, Figure 2 As shown, the method comprises the following steps:

[0060] S1. The power battery controller transmits the status information to the vehicle controller. The vehicle controller matches the appropriate power for the fuel cell system according to the power battery SOC and transmits the signal to the fuel cell system. The fuel cell responds to the control signal of the vehicle controller.

[0061] S2, the vehicle controller receives the power value signal of the fuel cell system, and also receives the power value signals of the motor controller and the integrated power controller, and defines the power value signals of the motor controller and the integrated power controller as the required power of the vehicle;

[0062] S3. The vehicle controller fully considers the changes in driving conditions and senses the different road conditions through the vehicle speed sensor, thereby determining the difference between the fuel cell power and the vehicle's required power;

[0063] S4. The vehicle controller compares the fuel cell power with the vehicle's required power. If the fuel cell power is ≥ the vehicle's required power, the fuel cell power can not only meet the vehicle's demand, but the excess energy can also supply electricity to the power battery. If the fuel cell power is < the vehicle's required power, the fuel cell and the power battery will jointly participate in the energy supply, but the fuel cell power will be consumed first, and then the power battery power will be consumed.

[0064] Specifically: The fuel cell vehicle is first powered on by the key, i.e., the power is turned on. In the low-voltage state, each controller of the vehicle, such as the vehicle controller, fuel cell system controller, integrated power controller, and power battery management system, receives a wake-up signal to check whether each controller is in a low-voltage wake-up state, and whether the vehicle controller sends and receives messages with each controller;

[0065] The fuel cell vehicle continues to be powered on, followed by START power, which is high voltage power. After the instrument shows READY, the vehicle can drive normally. At this time, turn on the fuel cell FC-EV switch and the fuel cell can work normally. The vehicle controller receives the motor power signal, air conditioning contactor status signal, defrost contactor status signal, and heater contactor status signal based on the interactive CAN signal between the motor controller and the integrated power controller, and calculates the current vehicle power demand. The fuel cell power is determined based on the vehicle power demand and the power battery SOC.

[0066] This embodiment takes into account that the vehicle has different power requirements under different road conditions, and different SOC intervals of the power battery also correspond to different fuel cell powers. By comparing the relationship between the fuel cell power and the vehicle power requirements, the fuel cell power is determined by the power battery SOC, and the vehicle power requirements are composed of the motor power and the integrated power accessories power, such as air conditioning, defrosting, and heating. By prejudging the vehicle power requirements, the fuel cell power value distribution is adjusted to be more reasonable, thereby further optimizing the vehicle energy distribution.

[0067] Embodiment 2:

[0068] This embodiment provides a bus fuel cell system energy management control system, including:

[0069] The data acquisition module is configured to: obtain the vehicle power requirement of the bus under different working conditions; wherein the vehicle power requirement includes the motor power and the integrated power accessory power;

[0070] The management module is configured to: determine the relationship between the vehicle power requirement and the fuel cell power; when the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement, and the electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is transmitted to the power battery; when the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement, and all the electric energy of the fuel cell is used up, and the rest of the energy is provided by the power battery.

[0071] The working method of the system is the same as the energy management control method of the bus fuel cell system in Example 1, and will not be repeated here.

[0072] Embodiment 3:

[0073] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the bus fuel cell system energy management control method described in Example 1 are implemented.

[0074] Embodiment 4:

[0075] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, the steps of the bus fuel cell system energy management control method described in Example 1 are implemented.

[0076] Embodiment 5:

[0077] This embodiment provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the bus fuel cell system energy management control method described in Example 1 are implemented.

[0078] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A bus fuel cell system energy management control method, characterized in that: include: Obtaining the required power of the entire bus under different working conditions; wherein the required power of the entire bus includes the motor power and the integrated power accessory power; Determine the relationship between the vehicle power requirement and the fuel cell power. When the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement. The electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is delivered to the power battery. When the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement. The electric energy of the fuel cell is fully used, and the rest of the energy is provided by the power battery.

2. The method for energy management and control of a fuel cell system for a bus as claimed in claim 1, characterized in that: The operating conditions include acceleration state, constant speed state, deceleration state and parking state; in the constant speed state, the power demand of the whole vehicle remains unchanged; in the acceleration state, the power demand of the whole vehicle increases; in the deceleration or parking state, the power demand of the whole vehicle decreases.

3. The method for energy management and control of a fuel cell system for a bus as claimed in claim 1, characterized in that: The power demand of the whole vehicle is the sum of the motor power, air conditioning power, defrost power and heater power.

4. The method for energy management and control of a fuel cell system for a bus as claimed in claim 3, characterized in that: The motor power is: P 电机 =T*n / 9550; v=0.377rn / i g i0; Where T is torque; n is speed; v is vehicle speed; r is wheel radius; n is engine speed; i g is the transmission ratio of the transmission; i0 is the transmission ratio of the main reducer.

5. The method for energy management and control of a fuel cell system for a bus as claimed in claim 1, characterized in that: When the motor power is in [0, 0.4]*P min Within the range, the power battery SOC is at 0.3B and the fuel cell power is at 0.8A; Among them, P min is the minimum power required by the vehicle; A is the rated power of the fuel cell; B is the full power of the power battery; When the motor power is in [0.4, 0.6]*P min Within the range, the power battery SOC is at 0.5B and the fuel cell power is at 0.7A; Level 3: When the motor power is [0.6*P min , P max ] range, the power battery SOC is at 0.7B, and the fuel cell power is at 0.4A; among them, P max It is the maximum power required by the vehicle.

6. The method for energy management and control of a fuel cell system for a bus as claimed in claim 5, characterized in that: The maximum power required by the vehicle represents the power when the motor, air conditioning, defrost and heater are all working.

7. A bus fuel cell system energy management control system, characterized in that: include: The data acquisition module is configured to: obtain the vehicle power requirement of the bus under different working conditions; wherein the vehicle power requirement includes the motor power and the integrated power accessory power; The management module is configured to: determine the relationship between the vehicle power requirement and the fuel cell power; when the fuel cell power is not less than the vehicle power requirement, the fuel cell power only needs to meet a maximum value of not less than the vehicle power requirement, and the electric energy of the fuel cell is first supplied to the vehicle power requirement, and the excess electric energy is transmitted to the power battery; when the fuel cell power is less than the vehicle power requirement, the fuel cell power only needs to meet a minimum value less than the vehicle power requirement, and all the electric energy of the fuel cell is used up, and the rest of the energy is provided by the power battery.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the bus fuel cell system energy management control method as described in any one of claims 1-6 are implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the bus fuel cell system energy management control method as described in any one of claims 1-6 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the bus fuel cell system energy management control method as described in any one of claims 1-6 are implemented.

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