Power-on and power-off control system and method for all-in-one controller of fuel cell and vehicle

Abstract

The invention discloses a power-on and power-off control of a fuel cell all-in-one controller, which belongs to the field of fuel cell automobiles and comprises a whole vehicle low-voltage storage battery connected with the fuel cell all-in-one controller. The fuel cell all-in-one controller is connected with a fuel cell stack, a power cell / high-voltage load, an air compressor and a fuel cell system controller, and the fuel cell system controller is connected with a whole vehicle system controller. The fuel cell all-in-one controller comprises a fuel cell DC / DC boost converter, an air compressor controller, a high-voltage power distribution unit and an electric pile AC impedance detector. In the power-on and power-off process of the fuel cell system, the fault risk is reduced, the overall performance of the fuel cell is improved, the service life of the fuel cell is prolonged, the safety of the fuel cell system is ensured, and the reliability of the fuel cell system in the power-on and power-off process is greatly improved.

Description

Technical Field

[0001] This invention discloses a fuel cell all-in-one controller power-on / off control system, method, and vehicle, belonging to the field of fuel cell vehicles. Background Technology

[0002] Fuel cells, as a highly efficient and environmentally friendly energy conversion technology, have received widespread attention in recent years. The working principle of a fuel cell is to convert fuel (such as hydrogen) and oxidant (such as oxygen) into electrical energy and water through a redox reaction.

[0003] Fuel cell vehicles, as a clean and efficient transportation solution, are gradually becoming an important development direction for the future automotive industry. As the power source for the entire vehicle, the safety of the fuel cell system is paramount during the power-on and power-off processes, particularly in reducing the risk of failure for its various components, improving the overall performance and lifespan of the fuel cell, and ensuring the safety of the fuel cell system. Currently, there are few methods for controlling the power-on and power-off of fuel cell vehicles, which affects the safety of the vehicle's high-voltage system. Summary of the Invention

[0004] The purpose of this invention is to address the problem that there are few power-on and power-off control methods for fuel cell vehicles, which affects the safety of the vehicle's high-voltage system. This invention proposes a fuel cell all-in-one controller power-on and power-off control system, method, and vehicle.

[0005] The problem to be solved by this invention is achieved by the following technical solution:

[0006] According to a first aspect of the present invention, a fuel cell all-in-one controller power-on / off control system is provided, including a vehicle low-voltage battery, the vehicle low-voltage battery being connected to the fuel cell all-in-one controller, the fuel cell all-in-one controller being connected to a fuel cell stack, a power battery / high-voltage load, an air compressor and a fuel cell system controller, the fuel cell system controller being connected to the vehicle system controller, the fuel cell all-in-one controller including: a fuel cell DC / DC boost converter, an air compressor controller, a high-voltage power distribution unit and a fuel cell stack AC impedance detection.

[0007] According to a second aspect of the present invention, a power-on / off control method for a fuel cell all-in-one controller is provided, applied to the power-on / off control system of the fuel cell all-in-one controller of the first aspect, comprising:

[0008] The fuel cell system controller obtains vehicle information by communicating with the vehicle system controller;

[0009] The fuel cell system controller obtains fuel cell system information through self-detection and CAN communication;

[0010] The fuel cell all-in-one controller interacts with the fuel cell system controller via CAN communication, and executes the power-on control strategy and power-off control strategy respectively.

[0011] Preferably, the power-on control strategy includes:

[0012] When the vehicle's low-voltage battery is powered and the ignition key is turned to the ON position, the low-voltage power supply to each component of the vehicle system will be activated and a self-test will be performed. The fuel cell all-in-one controller will also initialize and perform a self-test simultaneously.

[0013] If the fuel cell all-in-one controller self-tests successfully, it enters standby mode. If the fuel cell all-in-one controller self-tests unsuccessfully, it reports the fault to the fuel cell system controller and enters fault mode to stop the power-on process.

[0014] After the vehicle's power battery system completes the pre-charge test, the fuel cell system controller obtains the pre-charge status information of the power battery system through CAN communication with the vehicle system controller. The fuel cell system controller then informs the fuel cell all-in-one controller through CAN communication. If the pre-charge is successful, the process continues. If the pre-charge fails, the fault is reported to the fuel cell system controller, and the process enters fault mode to stop the power-on process.

[0015] The fuel cell all-in-one controller reports the output voltage of the fuel cell DC / DC boost converter to the fuel cell system controller.

[0016] The vehicle system controller sends the vehicle's required output power to the fuel cell system controller, and the fuel cell system controller calculates the current that the fuel cell all-in-one controller should output based on the vehicle's required power.

[0017] The fuel cell system controller sends the desired speed and operating mode request of the air compressor to the fuel cell all-in-one controller, so that the air compressor controller can enter the speed mode.

[0018] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and reach the target speed. The air compressor controller enters the RUN operation mode and reports the actual speed and operation mode of the air compressor to the fuel cell system controller.

[0019] After the air compressor controller enters the RUN mode, the fuel cell system controller sends a command to the input side of the fuel cell all-in-one controller to perform a pre-charge test.

[0020] The fuel cell all-in-one controller controls the closure of the pre-charge circuit on the input side and performs pre-charge detection and judgment. If the pre-charge is successful, it continues to the next step; if the pre-charge fails, it reports the fault to the fuel cell system controller and enters fault mode to stop the power-on process.

[0021] After the fuel cell all-in-one controller successfully pre-charges the input side, it closes the main input circuit and opens the pre-charge circuit, i.e., the input positive relay closes and the pre-charge relay opens. At the same time, the fuel cell all-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell all-in-one controller to the fuel cell system controller, and the fuel cell system controller reports the current working status of the fuel cell system to the vehicle system controller.

[0022] The fuel cell all-in-one controller reports the input voltage of the fuel cell DC / DC boost converter to the fuel cell system controller;

[0023] Once the input and output voltages of the fuel cell DC / DC boost converter in the fuel cell all-in-one controller both meet the threshold requirements, the fuel cell DC / DC boost converter enters the ready mode.

[0024] Once the fuel cell DC / DC boost converter is ready, the fuel cell system controller sends the required input current value and input constant current mode request of the fuel cell DC / DC boost converter to the fuel cell all-in-one controller to start load operation.

[0025] In the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the current output according to the requirements of the fuel cell system controller, and reports the current current and operating mode of the fuel cell DC / DC boost converter to the fuel cell system controller.

[0026] Preferably, the power-down control strategy includes:

[0027] When the vehicle system controller monitors the vehicle's operating conditions in real time, the fuel cell system controller dynamically responds to the vehicle's power demand. When the vehicle has a normal power-down demand, the vehicle system controller sends a normal power-down demand command to the fuel cell system controller and executes the normal power-down control strategy.

[0028] When a serious, unrecoverable fault occurs in the vehicle, the vehicle system controller first sends an emergency power-down command to the fuel cell system controller to execute the abnormal power-down control strategy.

[0029] Preferably, the normal power-down control strategy includes:

[0030] The fuel cell system controller sends a command to the fuel cell all-in-one controller, instructing the air compressor controller to control the air compressor to idle, in preparation for starting the fuel cell system purging operation.

[0031] The air compressor controller in the fuel cell all-in-one controller controls the air compressor to idle and reports the actual speed and working mode of the air compressor to the fuel cell system controller.

[0032] The fuel cell system controller sends a command to the fuel cell all-in-one controller to start the stack AC impedance detection, and simultaneously sends the stack AC impedance detection test frequency and current value.

[0033] The fuel cell all-in-one controller initiates the stack AC impedance detection process and reports the fuel cell stack AC impedance value to the fuel cell system controller.

[0034] The fuel cell system controller sends a residual hydrogen discharge command to the fuel cell all-in-one controller and simultaneously issues the required value of residual hydrogen discharge current, thus entering the residual hydrogen discharge state.

[0035] According to the residual hydrogen discharge requirements of the fuel cell system controller, the fuel cell DC / DC boost converter in the fuel cell all-in-one controller performs the first stage of residual hydrogen discharge and reports the stack voltage value to the fuel cell system controller. The fuel cell DC / DC boost converter stops discharging when the stack voltage is lower than the first residual hydrogen discharge voltage threshold.

[0036] The fuel cell all-in-one controller closes the residual hydrogen discharge relay to start the second stage of residual hydrogen discharge and reports the stack voltage value to the fuel cell system controller.

[0037] After the stack voltage stabilizes below the second residual hydrogen discharge voltage threshold and the voltage of a single fuel cell is above the minimum protection threshold, the fuel cell system controller sends a command to the fuel cell multi-function controller to disconnect the residual hydrogen discharge relay and end the residual hydrogen discharge.

[0038] The fuel cell system controller sends a command to the fuel cell all-in-one controller to put both the fuel cell DC / DC boost converter and the air compressor controller into standby mode, and simultaneously issues a current requirement of 0 for the fuel cell DC / DC boost converter and a speed expectation of 0 for the air compressor.

[0039] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it stabilizes, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller; in the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the output current to 0 to stop the load, and reports the current current and operating mode of the fuel cell DC / DC boost converter.

[0040] The fuel cell multi-in-one controller disconnects the main control input circuit. At the same time, the fuel cell multi-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell multi-in-one controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller.

[0041] The vehicle system controller sends a command to reduce the high voltage of the vehicle's power battery system, that is, the high voltage is reduced on the output side of the fuel cell all-in-one controller.

[0042] When the key is turned to the OFF position, all controllers inside the fuel cell all-in-one controller must meet the sleep conditions before entering the sleep process;

[0043] All controllers within the fuel cell all-in-one controller enter a sleep process and begin storing data information in the non-lossable storage area after power failure. The fuel cell all-in-one controller then enters a low-power mode.

[0044] Preferably, the abnormal power-down control strategy includes:

[0045] Upon receiving the message, the fuel cell system controller instructs both the fuel cell DC / DC boost converter and the air compressor controller in the fuel cell all-in-one controller to enter standby mode.

[0046] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it comes to a stable stop, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller;

[0047] The fuel cell DC / DC boost converter in the fuel cell all-in-one controller stops load operation when the control output current is 0, and reports the current current and operating mode of the fuel cell DC / DC boost converter.

[0048] The fuel cell multi-function controller disconnects the main input circuit, that is, it closes the positive input relay and disconnects the negative input relay, and reports the current working status of the high-voltage circuit inside the fuel cell multi-function controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller.

[0049] The vehicle system controller monitors the vehicle's operating conditions in real time. When the vehicle experiences a serious malfunction that could cause personal injury or even fire or explosion, the vehicle system controller immediately sends a command to reduce the high voltage of the vehicle's power battery system, i.e., the high voltage is reduced on the output side of the fuel cell all-in-one controller.

[0050] When a vehicle experiences a fault that significantly reduces its overall performance and cannot be reset on its own, the vehicle system controller will comprehensively consider the current vehicle speed and the actual operating conditions of the current, and then send a command to control the high voltage output side of the fuel cell multi-function controller to cut off the power.

[0051] According to a third aspect of the present invention, a vehicle is provided, including a vehicle body and a power-on / off control system for a fuel cell all-in-one controller as described in the first aspect.

[0052] The advantages of this invention compared to existing technologies are as follows:

[0053] This invention discloses a fuel cell all-in-one controller power-on / off control system, method, and vehicle. During the power-on / off process of the fuel cell system, it reduces the risk of failure, improves the overall performance and service life of the fuel cell, ensures the safety of the fuel cell system, and greatly improves the reliability of the fuel cell system during the power-on / off process. Attached Figure Description

[0054] Figure 1 This is a structural block diagram of the upper and lower control system of a fuel cell all-in-one controller according to the present invention.

[0055] Figure 2 This is a high-voltage topology diagram of the fuel cell multi-function controller power-on / off control method in the present invention.

[0056] Figure 3 This is a flowchart of the power-on control strategy in the up-and-down control method of a fuel cell all-in-one controller according to the present invention.

[0057] Figure 4 This is a flowchart of the normal power-down control strategy in the up-and-down control method of a fuel cell all-in-one controller of the present invention.

[0058] Figure 5 This is a flowchart of the abnormal power-down control strategy in the up and down control method of a fuel cell all-in-one controller of the present invention. Detailed Implementation

[0059] The following is based on the appendix Figure 1-5 The present invention will be further described as follows:

[0060] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] like Figure 1 and 2 As shown, the first embodiment of the present invention provides a fuel cell all-in-one controller power-on and power-off control system based on the prior art, including a vehicle low-voltage battery, the vehicle low-voltage battery being connected to the fuel cell all-in-one controller, the fuel cell all-in-one controller being connected to the fuel cell stack, the power battery / high-voltage load, the air compressor and the fuel cell system controller respectively, and the fuel cell system controller being connected to the vehicle system controller.

[0064] The fuel cell all-in-one controller mainly includes a fuel cell DC / DC boost converter, an air compressor controller, a high-voltage power distribution unit, and stack AC impedance detection, among which the DC / DC boost converter and the air compressor controller are the two main parts involved in the power-on and power-off control process.

[0065] The second embodiment of the present invention provides a power-on / off control method for a fuel cell all-in-one controller based on the first embodiment, comprising:

[0066] The fuel cell system controller obtains vehicle information by communicating with the vehicle system controller; the fuel cell system controller obtains fuel cell system information through self-detection and CAN communication; the fuel cell all-in-one controller interacts with the fuel cell system controller via CAN communication and executes power-on control strategy and power-off control strategy respectively.

[0067] The power-on control strategy, to ensure safe control during the power-on process, firstly, performs a system power-on self-test to ensure a comprehensive safety check before power-on; secondly, ensures the air compressor only starts working after the fuel cell multi-function controller output side is successfully pre-charged; finally, only after the fuel cell multi-function controller input side is successfully pre-charged and both the input and output voltage thresholds meet the requirements, does the load increase begin. Figure 3 As shown, the specific steps are as follows:

[0068] When the vehicle's low-voltage battery is powered and the ignition key is turned to the ON position, the low-voltage power is applied to all components of the vehicle system and a self-test is performed. The fuel cell all-in-one controller also initializes and performs a self-test simultaneously.

[0069] If the fuel cell all-in-one controller self-tests successfully, it enters standby mode. If the fuel cell all-in-one controller self-tests unsuccessfully, it reports the fault to the fuel cell system controller and enters fault mode to stop the power-on process.

[0070] Waiting for the vehicle's power battery system to complete the pre-charge test, such as Figure 2 As shown, the pre-charge detection on the DCF output side of the fuel cell all-in-one controller is the same point. The fuel cell system controller obtains the pre-charge status information of the power battery system through CAN communication with the vehicle system controller. The fuel cell system controller then informs the fuel cell all-in-one controller through CAN communication. If the pre-charge is successful, it continues to execute. If the pre-charge fails, it reports the fault to the fuel cell system controller and enters the fault mode to stop the power-on process.

[0071] The fuel cell all-in-one controller reports the output voltage of the fuel cell DC / DC boost converter to the fuel cell system controller, such as... Figure 2 As shown, the voltage at point F is relative to the negative terminal.

[0072] The vehicle system controller sends the vehicle's required output power to the fuel cell system controller, and the fuel cell system controller calculates the current that the fuel cell all-in-one controller should output based on the vehicle's required power.

[0073] The fuel cell system controller sends the desired speed and operating mode request of the air compressor to the fuel cell all-in-one controller, so that the air compressor controller can enter the speed mode.

[0074] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and reach the target speed. The air compressor controller enters the RUN operation mode and reports the actual speed and operation mode of the air compressor to the fuel cell system controller.

[0075] After the air compressor controller enters the RUN mode, the fuel cell system controller sends a command to the input side of the fuel cell all-in-one controller to perform a pre-charge test.

[0076] The fuel cell all-in-one controller controls the closure of the input-side pre-charge circuit, that is, the closure of the input negative relay and the pre-charge relay, such as... Figure 2 As shown, a pre-charge test is performed. If the pre-charge is successful, the process continues. If the pre-charge fails, a fault is reported to the fuel cell system controller, and the process enters a fault mode to stop the power-on process.

[0077] After the fuel cell all-in-one controller successfully pre-charges the input side, it closes the main input circuit and opens the pre-charge circuit, i.e., the input positive relay closes and the pre-charge relay opens. At the same time, the fuel cell all-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell all-in-one controller to the fuel cell system controller, and the fuel cell system controller reports the current working status of the fuel cell system to the vehicle system controller.

[0078] The fuel cell all-in-one controller reports the input voltage of the fuel cell DC / DC boost converter to the fuel cell system controller, such as... Figure 2 As shown, the voltage at point E relative to the negative terminal;

[0079] Once the input and output voltages of the fuel cell DC / DC boost converter in the fuel cell all-in-one controller both meet the threshold requirements, the fuel cell DC / DC boost converter enters the ready mode.

[0080] Once the fuel cell DC / DC boost converter is ready, the fuel cell system controller sends the required input current value and input constant current mode request of the fuel cell DC / DC boost converter to the fuel cell all-in-one controller to start load operation.

[0081] In the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the current output according to the requirements of the fuel cell system controller, and reports the current current and operating mode of the fuel cell DC / DC boost converter to the fuel cell system controller.

[0082] At this point, the power-on process is complete. However, depending on the actual operating conditions of the vehicle, the power demand of the vehicle on the fuel cell changes dynamically. Therefore, the output current of the fuel cell all-in-one controller is also dynamically adjusted accordingly.

[0083] The power-down control strategy, to ensure safe control during the power-down process, firstly, allows the air compressor to idle, preparing for the fuel cell system purging process to promptly remove accumulated moisture from the battery, ensuring normal operation of the battery system, extending battery life, and improving battery efficiency. Secondly, the residual hydrogen discharge state includes two stages: rapid discharge and slow discharge, balancing the consumption of residual oxygen within the system with the goal of rapid discharge and fuel cell protection. Finally, after all controllers within the fuel cell multi-function controller meet the sleep conditions, the system enters the sleep process, avoiding sleep jamming that could lead to system safety hazards. The specific steps are as follows:

[0084] When the vehicle system controller monitors the vehicle's operating conditions in real time, the fuel cell system controller dynamically responds to the vehicle's power demand. When the vehicle has a normal power-down demand, the vehicle system controller sends a normal power-down demand command to the fuel cell system controller and executes the normal power-down control strategy.

[0085] When a serious, unrecoverable fault occurs in the vehicle, the vehicle system controller first sends an emergency power-down command to the fuel cell system controller to execute the abnormal power-down control strategy.

[0086] The above-mentioned normal power-down control strategy, such as Figure 4 As shown, the specific steps include:

[0087] The fuel cell system controller sends a command to the fuel cell all-in-one controller, instructing the air compressor controller to control the air compressor to idle, in preparation for starting the fuel cell system purging operation.

[0088] The air compressor controller in the fuel cell all-in-one controller controls the air compressor to idle and reports the actual speed and working mode of the air compressor to the fuel cell system controller.

[0089] The fuel cell system controller sends a command to the fuel cell all-in-one controller to start the stack AC impedance detection, and simultaneously sends the stack AC impedance detection test frequency and current value. The EIS test frequency is preferably 100Hz to 2kHz, and the current value is preferably 0 to 20A.

[0090] The fuel cell all-in-one controller initiates the stack AC impedance detection process and reports the fuel cell stack AC impedance value to the fuel cell system controller.

[0091] The fuel cell system controller sends a residual hydrogen discharge command to the fuel cell all-in-one controller and simultaneously issues the residual hydrogen discharge current requirement value, entering the residual hydrogen discharge state. Here, the residual hydrogen discharge state is divided into two stages. The first stage is rapid discharge through a large current of DCF, and the second stage is slow discharge through a power resistor (e.g., 100Ω / 200W). This ensures that the residual hydrogen discharge requirement is completed within a short time (e.g., 2 minutes) and avoids battery performance degradation or damage caused by excessively low voltage of individual fuel cell cells.

[0092] According to the residual hydrogen discharge requirements of the fuel cell system controller, the fuel cell DC / DC boost converter in the fuel cell all-in-one controller performs the first stage of residual hydrogen discharge and reports the stack voltage value to the fuel cell system controller. Figure 2 As shown, the fuel cell DC / DC boost converter stops discharging at points A and B on the output side of the all-in-one controller until the stack voltage is lower than the first residual hydrogen discharge voltage threshold.

[0093] The fuel cell all-in-one controller closes the residual hydrogen discharge relay, initiating the second stage of residual hydrogen discharge, and reports the stack voltage value to the fuel cell system controller. Figure 2 Points A and B on the output side of the fuel cell all-in-one controller are shown.

[0094] After the stack voltage stabilizes below the second residual hydrogen discharge voltage threshold and the voltage of a single fuel cell is above the minimum protection threshold, the fuel cell system controller sends a command to the fuel cell multi-function controller to disconnect the residual hydrogen discharge relay and end the residual hydrogen discharge.

[0095] The fuel cell system controller sends a command to the fuel cell all-in-one controller to put both the fuel cell DC / DC boost converter and the air compressor controller into standby mode, and simultaneously issues a current requirement of 0 for the fuel cell DC / DC boost converter and a speed expectation of 0 for the air compressor.

[0096] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it stabilizes, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller; in the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the output current to 0 to stop the load, and reports the current current and operating mode of the fuel cell DC / DC boost converter.

[0097] The fuel cell multi-in-one controller disconnects the main control input circuit. At the same time, the fuel cell multi-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell multi-in-one controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller.

[0098] The vehicle system controller sends a command to reduce the high voltage of the vehicle's power battery system, that is, to reduce the high voltage output of the fuel cell multi-function controller. Figure 2 The fuel cell all-in-one controller outputs two points C and D as shown;

[0099] When the key is turned to the OFF position, all controllers inside the fuel cell all-in-one controller must meet the sleep conditions before entering the sleep process. It is necessary to ensure that all controllers inside the fuel cell all-in-one controller can enter sleep synchronously to avoid the situation where one controller is ready to sleep while the other controllers are still working, which could lead to sleep jamming and loss of control, and thus cause safety hazards.

[0100] All controllers inside the fuel cell all-in-one controller, such as DCF and ACU, enter a sleep process and begin storing fault codes, timestamps, and other data information in the non-loss storage area after power failure. The fuel cell all-in-one controller then enters a low-power mode.

[0101] The above-mentioned abnormal power-down control strategies, such as Figure 5 As shown, the specific steps include:

[0102] Upon receiving the message, the fuel cell system controller instructs both the fuel cell DC / DC boost converter and the air compressor controller in the fuel cell all-in-one controller to enter standby mode.

[0103] In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it comes to a stable stop, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller;

[0104] The fuel cell DC / DC boost converter in the fuel cell all-in-one controller stops load operation when the control output current is 0, and reports the current current and operating mode of the fuel cell DC / DC boost converter.

[0105] The fuel cell multi-function controller disconnects the main input circuit, that is, it closes the positive input relay and disconnects the negative input relay, and reports the current working status of the high-voltage circuit inside the fuel cell multi-function controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller.

[0106] The vehicle system controller monitors the vehicle's operating conditions in real time. When a serious malfunction occurs that could cause personal injury, fire, or explosion, the vehicle system controller immediately sends a command to de-energize the vehicle's power battery system, specifically by de-energizing the high voltage output of the fuel cell multi-function controller. Figure 2 The fuel cell all-in-one controller outputs two points C and D as shown;

[0107] When a vehicle experiences a fault that significantly degrades its performance and cannot be automatically reset, the vehicle system controller will comprehensively consider the current vehicle speed and current conditions, and then send a command to control the high-voltage output of the fuel cell multi-function controller to cut off power. Figure 2 The output side of the fuel cell all-in-one controller, points C and D, are shown.

[0108] The third embodiment of the present invention provides a vehicle based on the first embodiment, including a vehicle body and a power-on / off control system of the fuel cell all-in-one controller of the first embodiment.

[0109] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A fuel cell all-in-one controller power-on / off control system, characterized in that, It includes a vehicle low-voltage battery, which is connected to a fuel cell multi-function controller. The fuel cell multi-function controller is connected to the fuel cell stack, the power battery / high-voltage load, the air compressor, and the fuel cell system controller. The fuel cell system controller is connected to the vehicle system controller. The fuel cell multi-function controller includes: a fuel cell DC / DC boost converter, an air compressor controller, a high-voltage power distribution unit, and a fuel cell stack AC impedance detection.

2. A method for controlling the power-on / off of a fuel cell all-in-one controller, applied to the power-on / off control system of the fuel cell all-in-one controller as described in claim 1, characterized in that, include: The fuel cell system controller obtains vehicle information by communicating with the vehicle system controller; The fuel cell system controller obtains fuel cell system information through self-detection and CAN communication; The fuel cell all-in-one controller interacts with the fuel cell system controller via CAN communication, and executes the power-on control strategy and power-off control strategy respectively.

3. A method for power-on / off control of a fuel cell all-in-one controller according to claim 2, characterized in that, Power-on control strategies include: When the vehicle's low-voltage battery is powered and the ignition key is turned to the ON position, the low-voltage power supply to each component of the vehicle system will be activated and a self-test will be performed. The fuel cell all-in-one controller will also initialize and perform a self-test simultaneously. If the fuel cell all-in-one controller self-tests successfully, it enters standby mode. If the fuel cell all-in-one controller self-tests unsuccessfully, it reports the fault to the fuel cell system controller and enters fault mode to stop the power-on process. After the vehicle's power battery system completes the pre-charge test, the fuel cell system controller obtains the pre-charge status information of the power battery system through CAN communication with the vehicle system controller. The fuel cell system controller then informs the fuel cell all-in-one controller through CAN communication. If the pre-charge is successful, the process continues. If the pre-charge fails, the fault is reported to the fuel cell system controller, and the process enters fault mode to stop the power-on process. The fuel cell all-in-one controller reports the output voltage of the fuel cell DC / DC boost converter to the fuel cell system controller. The vehicle system controller sends the vehicle's required output power to the fuel cell system controller, and the fuel cell system controller calculates the current that the fuel cell all-in-one controller should output based on the vehicle's required power. The fuel cell system controller sends the desired speed and operating mode request of the air compressor to the fuel cell all-in-one controller, so that the air compressor controller can enter the speed mode. In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and reach the target speed. The air compressor controller enters the RUN operation mode and reports the actual speed and operation mode of the air compressor to the fuel cell system controller. After the air compressor controller enters the RUN mode, the fuel cell system controller sends a command to the input side of the fuel cell all-in-one controller to perform a pre-charge test. The fuel cell all-in-one controller controls the closure of the pre-charge circuit on the input side and performs pre-charge detection and judgment. If the pre-charge is successful, it continues to the next step; if the pre-charge fails, it reports the fault to the fuel cell system controller and enters fault mode to stop the power-on process. After the fuel cell all-in-one controller successfully pre-charges the input side, it closes the main input circuit and opens the pre-charge circuit, i.e., the input positive relay closes and the pre-charge relay opens. At the same time, the fuel cell all-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell all-in-one controller to the fuel cell system controller, and the fuel cell system controller reports the current working status of the fuel cell system to the vehicle system controller. The fuel cell all-in-one controller reports the input voltage of the fuel cell DC / DC boost converter to the fuel cell system controller; Once the input and output voltages of the fuel cell DC / DC boost converter in the fuel cell all-in-one controller both meet the threshold requirements, the fuel cell DC / DC boost converter enters the ready mode. Once the fuel cell DC / DC boost converter is ready, the fuel cell system controller sends the required input current value and input constant current mode request of the fuel cell DC / DC boost converter to the fuel cell all-in-one controller to start load operation. In the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the current output according to the requirements of the fuel cell system controller, and reports the current current and operating mode of the fuel cell DC / DC boost converter to the fuel cell system controller.

4. A method for power-on / off control of a fuel cell all-in-one controller according to claim 3, characterized in that, Power-down control strategies include: When the vehicle system controller monitors the vehicle's operating conditions in real time, the fuel cell system controller dynamically responds to the vehicle's power demand. When the vehicle has a normal power-down demand, the vehicle system controller sends a normal power-down demand command to the fuel cell system controller and executes the normal power-down control strategy. When a serious, unrecoverable fault occurs in the vehicle, the vehicle system controller first sends an emergency power-down command to the fuel cell system controller to execute the abnormal power-down control strategy.

5. A method for power-on / off control of a fuel cell all-in-one controller according to claim 4, characterized in that, Normal power-down control strategies include: The fuel cell system controller sends a command to the fuel cell all-in-one controller, instructing the air compressor controller to control the air compressor to idle, in preparation for starting the fuel cell system purging operation. The air compressor controller in the fuel cell all-in-one controller controls the air compressor to idle and reports the actual speed and working mode of the air compressor to the fuel cell system controller. The fuel cell system controller sends a command to the fuel cell all-in-one controller to start the stack AC impedance detection, and simultaneously sends the stack AC impedance detection test frequency and current value. The fuel cell all-in-one controller initiates the stack AC impedance detection process and reports the fuel cell stack AC impedance value to the fuel cell system controller. The fuel cell system controller sends a residual hydrogen discharge command to the fuel cell all-in-one controller and simultaneously issues the required value of residual hydrogen discharge current, thus entering the residual hydrogen discharge state. According to the residual hydrogen discharge requirements of the fuel cell system controller, the fuel cell DC / DC boost converter in the fuel cell all-in-one controller performs the first stage of residual hydrogen discharge and reports the stack voltage value to the fuel cell system controller. The fuel cell DC / DC boost converter stops discharging when the stack voltage is lower than the first residual hydrogen discharge voltage threshold. The fuel cell all-in-one controller closes the residual hydrogen discharge relay to start the second stage of residual hydrogen discharge and reports the stack voltage value to the fuel cell system controller. After the stack voltage stabilizes below the second residual hydrogen discharge voltage threshold and the voltage of a single fuel cell is above the minimum protection threshold, the fuel cell system controller sends a command to the fuel cell multi-function controller to disconnect the residual hydrogen discharge relay and end the residual hydrogen discharge. The fuel cell system controller sends a command to the fuel cell all-in-one controller to put both the fuel cell DC / DC boost converter and the air compressor controller into standby mode, and simultaneously issues a current requirement of 0 for the fuel cell DC / DC boost converter and a speed expectation of 0 for the air compressor. In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it stabilizes, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller; in the fuel cell all-in-one controller, the fuel cell DC / DC boost converter controls the output current to 0 to stop the load, and reports the current current and operating mode of the fuel cell DC / DC boost converter. The fuel cell multi-in-one controller disconnects the main control input circuit. At the same time, the fuel cell multi-in-one controller reports the current working status of the high-voltage circuit inside the fuel cell multi-in-one controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller. The vehicle system controller sends a command to reduce the high voltage of the vehicle's power battery system, that is, the high voltage is reduced on the output side of the fuel cell all-in-one controller. When the key is turned to the OFF position, all controllers inside the fuel cell all-in-one controller must meet the sleep conditions before entering the sleep process; All controllers within the fuel cell all-in-one controller enter a sleep process and begin storing data information in the non-lossable storage area after power failure. The fuel cell all-in-one controller then enters a low-power mode.

6. A method for power-on / off control of a fuel cell all-in-one controller according to claim 4, characterized in that, Abnormal power-down control strategies include: Upon receiving the message, the fuel cell system controller instructs both the fuel cell DC / DC boost converter and the air compressor controller in the fuel cell all-in-one controller to enter standby mode. In the fuel cell all-in-one controller, the air compressor controller controls the air compressor to start and stop until it comes to a stable stop, and reports the actual speed and operating mode of the air compressor to the fuel cell system controller; The fuel cell DC / DC boost converter in the fuel cell all-in-one controller stops load operation when the control output current is 0, and reports the current current and operating mode of the fuel cell DC / DC boost converter. The fuel cell all-in-one controller disconnects the main control input circuit and reports the current working status of the high-voltage circuit inside the fuel cell all-in-one controller to the fuel cell system controller. The fuel cell system controller then reports the current working status of the fuel cell system to the vehicle system controller. The vehicle system controller monitors the vehicle's operating conditions in real time. When the vehicle experiences a serious malfunction that could cause personal injury or even fire or explosion, the vehicle system controller immediately sends a command to reduce the high voltage of the vehicle's power battery system, i.e., the high voltage is reduced on the output side of the fuel cell all-in-one controller. When a vehicle experiences a fault that significantly reduces its overall performance and cannot be reset on its own, the vehicle system controller will comprehensively consider the current vehicle speed and the actual operating conditions of the current, and then send a command to control the high voltage output side of the fuel cell multi-function controller to cut off the power.

7. A vehicle, characterized in that, It includes the vehicle body and the fuel cell all-in-one controller power-on / off control system as described in claim 1.

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