Whole vehicle level fuel cell system cold start control system and method

Abstract

The application provides a whole vehicle level fuel cell system cold start control system and method, and relates to the battery control field.The whole vehicle controller is used for sending an instruction to a power battery management controller, obtaining the sustained charging power allowed by the power battery; sending an acquisition instruction to a fuel cell system controller, obtaining the idling power of the fuel cell system; comparing the sustained charging power allowed by the power battery and the idling power of the fuel cell system; when the sustained charging power allowed by the power battery is less than the idling power of the fuel cell system, sending an operation state acquisition instruction to an integrated power supply controller, receiving the high-voltage accessory operation state fed back by the integrated power supply controller, judging whether the operation state of the high-voltage accessory exists in a closed state, and sending a start-up instruction to the fuel cell system controller.The application can shorten the start-up time of the fuel cell system under the low-temperature condition to the maximum extent, and improves the fuel cell use efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of battery control of fuel cell buses, and particularly relates to a vehicle-level fuel cell system cold start control system and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Currently, in a low-temperature environment, to prevent overcharging of the power battery, the start time of the vehicle-mounted fuel cell system is limited by the charging power allowed by the power battery, that is, when the temperature of the power battery monomer is below 0℃, the power battery itself allows the charging power to be 0 due to its own protection, and it is not allowed to be charged by the outside world. Under such a condition, the start and idle running of the fuel cell system will cause certain risks to the operation of the vehicle. Only when the power battery is heated by itself or through the demand discharge of the vehicle to raise its temperature to a certain condition temperature, the vehicle allows the fuel cell system to start, and the fuel cell system can enter the low-temperature start mode.

[0004] In the low-temperature start mode of the fuel cell system, since the temperature of the fuel cell itself is very low, the fuel cell system can only be normally operated to supply power to the power system after being heated to a certain temperature by an external PTC or self-heating. In this way, the start time of the fuel cell system is affected by the double superposition of the heating time of the power battery and the cold start time of the system itself. According to experience, in an environment of-30℃, the start time of the vehicle fuel cell system needs to be about 40min, which seriously affects the driving experience of the fuel cell vehicle and the large-scale promotion to the extremely cold areas. SUMMARY

[0005] To overcome the shortcomings of the prior art, the present application provides a vehicle-level fuel cell system cold start control system and method, which can minimize the start time of the fuel cell system under low-temperature conditions and improve the use efficiency of the fuel cell.

[0006] To achieve the above object, one or more embodiments of the present application provide the following technical solutions:

[0007] The present application provides a vehicle-level fuel cell system cold start control system in a first aspect.

[0008] A vehicle-level fuel cell system cold start control system, comprising a vehicle controller, a fuel cell system controller, an integrated power supply controller, a power battery management controller, a fuel cell system and a high-voltage accessory, wherein:

[0009] An integrated power supply controller is configured to receive an operation state acquisition instruction from a vehicle controller, acquire an operation state of a high-voltage accessory, and send the operation state of the high-voltage accessory to the vehicle controller, wherein the high-voltage accessory includes an air conditioner contactor, an electric heater contactor, a water heater contactor, and a defrosting contactor.

[0010] A power battery management controller is configured to receive an instruction from a vehicle controller, acquire a continuous charging power allowed by a power battery, and send the continuous charging power allowed by the power battery to the vehicle controller.

[0011] A fuel cell system controller is configured to receive an acquisition instruction sent by the vehicle controller, acquire an idle power of the fuel cell system, send the idle power of the fuel cell system to the vehicle controller, receive a start-up instruction sent by the vehicle controller, and control the fuel cell system to start up.

[0012] The vehicle controller is configured to send an instruction to the power battery management controller to acquire the continuous charging power allowed by the power battery, send an acquisition instruction to the fuel cell system controller to acquire the idle power of the fuel cell system, compare the continuous charging power allowed by the power battery with the idle power of the fuel cell system, send an operation state acquisition instruction to the integrated power supply controller when the continuous charging power allowed by the power battery is less than the idle power of the fuel cell system, receive the operation state of the high-voltage accessory fed back by the integrated power supply controller, and send a start-up instruction to the fuel cell system controller when the operation state of the high-voltage accessory includes a closed state.

[0013] The second aspect of the present application provides a vehicle-level fuel cell system cold start control method.

[0014] The vehicle-level fuel cell system cold start control method includes the following steps:

[0015] The vehicle controller acquires the idle power of the fuel cell system and the continuous charging power allowed by the power battery, compares the two, and sends an operation state acquisition instruction to the integrated power supply controller when the continuous charging power allowed by the power battery is less than the idle power of the fuel cell system.

[0016] The integrated power supply controller acquires the operation state of the high-voltage accessory and sends the operation state of the high-voltage accessory to the vehicle controller, wherein the high-voltage accessory includes an air conditioner contactor, an electric heater contactor, a water heater contactor, and a defrosting contactor.

[0017] The vehicle controller receives the operation state of the high-voltage accessory fed back by the integrated power supply controller, and sends a start-up instruction to the fuel cell system controller when the operation state of the high-voltage accessory includes a closed state.

[0018] The fuel cell system controller receives a start-up instruction sent by the vehicle controller and controls the fuel cell system to start up.

[0019] The vehicle controller obtains the high-voltage accessory power demand, the motor power demand and the cold start mode of the fuel cell system after sending the start-up instruction to the fuel cell system controller, and determines the requested power to the fuel cell system based on the high-voltage accessory power demand, the motor power demand and the cold start mode of the fuel cell system.

[0020] The above one or more technical solutions have the following beneficial effects:

[0021] The application provides a vehicle-level fuel cell system cold start control system and method, when the low-temperature condition does not support the start-up of the fuel cell system, the vehicle controller comprehensively considers the running state of the high-voltage components of the vehicle, sends the start-up instruction and the requested power to the fuel cell system controller under the condition that the power battery is not overcharged, shortens the cold start time of the fuel cell system at the vehicle level, and improves the running efficiency of the fuel cell system under the low-temperature condition.

[0022] The advantages of the additional aspects of the application will be partially given in the following description, partially become obvious from the following description, or be known by the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The illustrations are shown for the purpose of enabling those skilled in the art to

[0024] Figure 1 It is a system structure diagram of the first embodiment.

[0025] Figure 2 It is a method flowchart of the second embodiment. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs.

[0027] It should be noted that the terms used herein are for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the application.

[0028] The embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0029] The overall idea of the application is as follows:

[0030] The application discloses a whole vehicle level fuel cell system cold start control system and method.

[0031] In addition, after the whole vehicle controller allows the fuel cell system controller to start, the whole vehicle controller determines the requested power of the fuel cell system from the whole vehicle controller according to the high voltage accessory power demand, the motor power demand and the cold start mode of the fuel cell system, so that the starting time of the fuel cell system under low temperature condition is shortened to the maximum extent, and the fuel cell use efficiency is improved.

[0032] Embodiment one

[0033] The embodiment discloses a whole vehicle level fuel cell system cold start control system.

[0034] As shown in Figure 1 A whole vehicle level fuel cell system cold start control system comprises a whole vehicle controller, a fuel cell system controller, an integrated power supply controller, a power battery management controller, a fuel cell system and high voltage accessories, wherein:

[0035] The integrated power supply controller is used for receiving the running state acquisition instruction of the whole vehicle controller, acquiring the running state of the high voltage accessories, and sending the running state of the high voltage accessories to the whole vehicle controller, wherein the high voltage accessories comprise an air conditioner contactor, an electric heater contactor, a water heater contactor and a defrosting contactor.

[0036] The power battery management controller is used for receiving the instruction of the whole vehicle controller, acquiring the continuous charging power allowed by the power battery, and sending the continuous charging power allowed by the power battery to the whole vehicle controller.

[0037] The fuel cell system controller is used for receiving the acquisition instruction sent by the whole vehicle controller, acquiring the idling power of the fuel cell system, sending the idling power of the fuel cell system to the whole vehicle controller, receiving the starting instruction sent by the whole vehicle controller, and controlling the fuel cell system to start.

[0038] The vehicle controller is configured to send an instruction to the power battery management controller to obtain a continuous charging power allowed by the power battery, send an obtaining instruction to the fuel cell system controller to obtain an idling power of the fuel cell system, compare the continuous charging power allowed by the power battery with the idling power of the fuel cell system, and when the continuous charging power allowed by the power battery is less than the idling power of the fuel cell system, send a start-up instruction to the fuel cell system controller.

[0039] Further, the vehicle controller judges that the running state of the high-voltage accessory has the closed state, that is, the vehicle controller judges that the running state of one of the air conditioner contactor, the electric heater contactor, the water heater contactor and the defrosting contactor is in the closed state.

[0040] Further, the idling power of the fuel cell system is determined by the fuel cell system itself, and the idling power of the fuel cell system is different for fuel cell systems with different rated powers.

[0041] Further, the vehicle controller is further configured to obtain a high-voltage accessory power demand, a motor power demand and a cold start mode of the fuel cell system after sending the start-up instruction to the fuel cell system controller, and determine a requested power of the fuel cell system according to the high-voltage accessory power demand, the motor power demand and the cold start mode of the fuel cell system.

[0042] Further, the vehicle controller is further configured to send a demand obtaining instruction to the integrated power supply controller to obtain the high-voltage accessory power demand, and the high-voltage accessory power demand is:

[0043] P 附件 = P 空调 + P 电暖风 + P 水暖 + P 除霜 + P 电池

[0044] wherein, P 附件 is the high-voltage accessory power demand, P 空调 is an air conditioner minimum power value, P 电暖风 is an electric heater minimum power value, P 水暖 is a water heater minimum power value, P 除霜 is a defrosting minimum power value, and P 电池 is a power battery self-heating minimum power value.

[0045] Further, the vehicle controller is further configured to send a demand obtaining instruction to the motor controller to obtain the motor power demand, and the motor power demand is:

[0046] If P 电机 ≥ P 限制 , then P 电机 = P 限制 - ΔP 保护 , if P 电机 < P 限制 , then P 电机 = 0.

[0047] wherein P 电机 is the motor power demand, P 限制 is the motor power demand threshold, and ΔP 保护 is the power reservation value for preventing overcharging of the power battery.

[0048] Further, the cold start mode of the fuel cell system is external heating or self-heating of the stack.

[0049] Further, the requested power of the fuel cell system by the vehicle controller is:

[0050] If the cold start mode of the fuel cell system is external heating, then

[0051] P 请求 = P 附件 + P 电机 + P 外部加热 ,

[0052] If the cold start mode of the fuel cell system is self-heating, then

[0053] P 请求 = P 附件 + P 电机 - P 自加热 ,

[0054] wherein P 请求 is the requested power of the fuel cell system by the vehicle controller, P 外部加热 is the power when the cold start mode of the fuel cell system is external heating, and P 自加热 is the power when the cold start mode of the fuel cell system is self-heating.

[0055] Further, the vehicle controller and the fuel cell system controller, the vehicle controller and the integrated power supply controller, the vehicle controller and the power battery management controller, and the vehicle controller and the motor controller all realize signal interaction through CAN communication.

[0056] The vehicle controller receives the high-voltage accessory, power battery, motor, and fuel cell system state and parameter values through the CAN network, and sends the start-up instruction and requested power value to the fuel cell system controller according to the received state and parameter values.

[0057] Embodiment Two

[0058] This embodiment discloses a cold start control method for a fuel cell system at the vehicle level.

[0059] like Figure 2 As shown, the cold start control method for a fuel cell system at the vehicle level includes the following steps:

[0060] The vehicle controller obtains the idle power of the fuel cell system and the allowable continuous charging power of the power battery, compares the two, and when the allowable continuous charging power of the power battery is less than the idle power of the fuel cell system, it sends an operating status acquisition command to the integrated power controller.

[0061] The integrated power controller acquires the operating status of the high-voltage accessories and sends the operating status of the high-voltage accessories to the vehicle controller. The high-voltage accessories include air conditioning contactors, electric heater contactors, water heater contactors, and defrost contactors.

[0062] The vehicle controller receives feedback from the integrated power controller on the operating status of the high-voltage accessories. When it determines that there is a closed state in the operating status of the high-voltage accessories, it sends a start command to the fuel cell system controller.

[0063] The fuel cell system controller receives the start-up command sent by the vehicle controller and controls the fuel cell system to start up;

[0064] After sending the power-on command to the fuel cell system controller, the vehicle controller obtains the power requirements of the high-voltage accessories, the power requirements of the motor, and the cold start mode of the fuel cell system. Based on the power requirements of the high-voltage accessories, the power requirements of the motor, and the cold start mode of the fuel cell system, it determines the power to be requested from the fuel cell system.

[0065] Specifically, the steps include the following:

[0066] (1) When the fuel cell bus key is turned to the ON position, the vehicle controller, fuel cell system controller and battery management system are activated.

[0067] The key electrical signal consists of three signals: OFF, ON, and Start. When in the ON position, the vehicle controller, fuel cell system controller, battery management system, and integrated power supply are awakened and can send and receive messages normally. The vehicle controller, fuel cell system controller, battery management system, and integrated power supply can interact with each other via a CAN network architecture.

[0068] (2) The vehicle controller detects the operating status of the power battery and high-voltage accessories and sends a start-up command to the fuel cell engine;

[0069] The key hits the start signal, the whole vehicle is high pressure, the instrument shows ready. Open the fuel cell system switch button, the whole vehicle controller receives the power battery management system issued power battery allows continuous recharging power and the state of air conditioning, electric defrosting, water heating, warm air contactor inside the integrated power supply, determine whether to send start instruction to the fuel cell system in low temperature state. The whole vehicle controller judges, if the low temperature state power battery allows continuous recharging power is less than the fuel cell system idle power and the state of air conditioning, electric defrosting, water heating, warm air contactor inside the integrated power supply is any one of 1 (1 indicates that the contactor is closed, the high voltage accessory is in working condition), the whole vehicle controller sends start instruction to the fuel cell system controller; Otherwise, the whole vehicle controller does not send start instruction to the fuel cell system controller.

[0070] (3) The whole vehicle controller sends request power to the fuel cell system controller.

[0071] The whole vehicle controller sends start instruction to the fuel cell system controller at the same time, sends request power to the fuel cell system controller. The whole vehicle controller receives the voltage and current value of the motor through the CAN line and obtains the motor demand power by calculation, and the whole vehicle controller redefines the motor power demand value according to the motor power demand threshold value and the power reservation value to prevent overcharging of the power battery. The whole vehicle controller determines the high voltage accessory demand power according to the running state of each high voltage accessory. The whole vehicle controller determines whether the fuel cell system discharges or consumes power during the cold start process according to the cold start mode of the fuel cell system itself. Finally, the whole vehicle controller determines the request power of the whole vehicle to the fuel cell system according to the above motor demand power, high voltage accessory demand power and cold start mode of the fuel cell.

[0072] Those skilled in the art should understand that the above modules or steps of the present application can be realized by a general computer device, alternatively, they can be realized by program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or a plurality of modules or steps can be made into a single integrated circuit module. The present application is not limited to any specific combination of hardware and software.

[0073] Although the specific embodiments of the present application are described above in combination with the drawings, it is not a limitation on the scope of protection of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the scope of protection of the present application.

Claims

1. A vehicle-level fuel cell system cold start control system, characterized by, The vehicle controller, the fuel cell system controller, the integrated power supply controller, the power battery management controller, the fuel cell system and the high-voltage accessory, wherein: The integrated power supply controller is configured to receive the operation state acquisition instruction from the vehicle controller, acquire the operation state of the high-voltage accessory, and send the operation state of the high-voltage accessory to the vehicle controller, wherein the high-voltage accessory includes an air conditioner contactor, an electric heater contactor, a water heater contactor and a defrosting contactor; The power battery management controller is configured to receive the instruction from the vehicle controller, acquire the continuous charging power allowed by the power battery, and send the continuous charging power allowed by the power battery to the vehicle controller; The fuel cell system controller is configured to receive the acquisition instruction sent by the vehicle controller, acquire the idling power of the fuel cell system, send the idling power of the fuel cell system to the vehicle controller, receive the start-up instruction sent by the vehicle controller, and control the start-up of the fuel cell system; The vehicle controller is configured to send the instruction to the power battery management controller, acquire the continuous charging power allowed by the power battery, send the acquisition instruction to the fuel cell system controller, acquire the idling power of the fuel cell system, compare the continuous charging power allowed by the power battery with the idling power of the fuel cell system, send the operation state acquisition instruction to the integrated power supply controller when the continuous charging power allowed by the power battery is less than the idling power of the fuel cell system, receive the feedback of the operation state of the high-voltage accessory from the integrated power supply controller, and determine that there is a closed state in the operation state of the high-voltage accessory, and send the start-up instruction to the fuel cell system controller; The vehicle controller is further configured to determine the requested power of the fuel cell system according to the power demand of the high-voltage accessory, the power demand of the motor and the cold start mode of the fuel cell system after sending the start-up instruction to the fuel cell system controller.

2. The whole vehicle level fuel cell system cold start control system according to claim 1, characterized by, The vehicle controller determines that there is a closed state in the operation state of the high-voltage accessory, that is, the vehicle controller determines that the operation state of one of the air conditioner contactor, the electric heater contactor, the water heater contactor and the defrosting contactor is in a closed state.

3. The whole vehicle level fuel cell system cold start control system according to claim 1, characterized by, The idling power of the fuel cell system is determined by the fuel cell system itself.

4. The whole vehicle level fuel cell system cold start control system according to claim 1, characterized by, The vehicle controller is further configured to send the demand acquisition instruction to the integrated power supply controller to acquire the power demand of the high-voltage accessory, and the power demand of the high-voltage accessory is: P 附件 = P 空调 + P 电暖风 + P 水暖 + P 除霜 + P 电池 P 附件 P 空调 P 电暖风 P 水暖 P 除霜 P 电池 P 5. The whole vehicle level fuel cell system cold start control system according to claim 4, characterized by, The vehicle controller is further configured to send the demand acquisition instruction to the motor controller to acquire the power demand of the motor, and the power demand of the motor is: If P 电机 ≥ P 限制 , then P 电机 = P 限制 - ΔP 保护 , if P 电机 < P 限制 , then P 电机 = 0; where P 电机 is the motor power demand, P 限制 is the motor power demand threshold, ΔP 保护 is the power reservation value to prevent overcharging of the power battery.

6. The whole vehicle level fuel cell system cold start control system according to claim 5, characterized by, The cold start mode of the fuel cell system is external heating or stack self-heating.

7. The whole vehicle level fuel cell system cold start control system according to claim 6, characterized by, The requested power of the fuel cell system by the vehicle controller is: If the cold start mode of the fuel cell system is external heating, then P 请求 = P 附件 +P 电机 +P 外部加热 , If the cold start mode of the fuel cell system is self-heating, then P 请求 = P 附件 + P 电机 - P 自加热 , Among them, P 请求 P is the power requested by the vehicle controller from the fuel cell system. 外部加热 P represents the power output of the fuel cell system when the cold start method is external heating. 自加热 This refers to the power output of the fuel cell system when it is self-heating during cold start.

8. The whole vehicle level fuel cell system cold start control system according to claim 5, characterized by, The vehicle controller, the fuel cell system controller, the integrated power supply controller, the power battery management controller and the motor controller are connected through CAN communication to realize signal interaction.

9. A method for controlling cold start of a fuel cell system at a vehicle level, characterized by: The method comprises the following steps: The whole vehicle controller acquires the idling power of the fuel cell system and the continuous charging power allowed by the power battery, compares the two, and sends a running state acquisition instruction to the integrated power supply controller when the continuous charging power allowed by the power battery is less than the idling power of the fuel cell system; The integrated power supply controller acquires the running state of the high-voltage accessories, and sends the running state of the high-voltage accessories to the whole vehicle controller, wherein the high-voltage accessories include an air conditioner contactor, an electric heater contactor, a water heater contactor, and a defrosting contactor; The whole vehicle controller receives the running state of the high-voltage accessories fed back by the integrated power supply controller, judges whether there is a closed state in the running state of the high-voltage accessories, and sends a start-up instruction to the fuel cell system controller when the closed state exists; The fuel cell system controller receives the start-up instruction sent by the whole vehicle controller, and controls the fuel cell system to start up; After sending the start-up instruction to the fuel cell system controller, the whole vehicle controller acquires the power demand of the high-voltage accessories, the power demand of the motor, and the cold start mode of the fuel cell system, and determines the requested power to the fuel cell system based on the power demand of the high-voltage accessories, the power demand of the motor, and the cold start mode of the fuel cell system.

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