Power generation control method of double-stack hydrogen fuel cell

Abstract

The invention relates to the field of automobile power generation control, in particular to a power generation control method of a double-stack hydrogen fuel cell, which comprises the following steps: setting the rated power of a first hydrogen stack as (A) kW, the rated power of a second hydrogen stack as (B) kW and the required power as (C) kW, judging the relationship between C and A, B and (A + B), and if C is less than or equal to A, outputting (C) kW by the first hydrogen stack; if Alt; clt; b, the second hydrogen reactor outputs (C) kW; if Blt; clt; (A + B), the first hydrogen reactor outputs (A) kW, the second hydrogen reactor outputs (C-A) kW, the vehicle control unit awakens the hydrogen reactors and starts the hydrogen reactors subjected to sweeping, blowing and self-inspection, meanwhile, the load pulling capacity of the hydrogen reactors is judged before load pulling, and faults such as overload are avoided. And the first hydrogen reactor and the second hydrogen reactor determine the output power of themselves according to the required power, and the double reactors generate power orderly, so that faults such as overload, limited power output and reactor shutdown caused by unbalanced power generation of the double reactors are avoided.

Description

Technical Field

[0001] The present invention relates to the field of automobile power generation control, and in particular to a power generation control method for a dual-stack hydrogen fuel cell. Background Art

[0002] The power generation control of gasoline vehicles, electric vehicles and hydrogen fuel vehicles is a crucial part of their respective power systems, and their respective working principles and control methods are significantly different. The power generation control of gasoline vehicles mainly refers to the control of the generator (usually refers to the auxiliary power generator on the vehicle, such as the on-board generator or starter generator), but in normal driving, its power does not come from "power generation", but directly from the power generated by the internal combustion engine burning gasoline or diesel. Electric vehicles include pure electric vehicles and hybrid electric vehicles, and their power generation control mainly refers to the management of the power battery pack and the control of the motor controller.

[0003] Hydrogen fuel cell vehicles use hydrogen fuel cells as their power source, and their power generation control mainly refers to the control of the hydrogen fuel cell system. Hydrogen fuel cells generate electricity and water through the chemical reaction of hydrogen and oxygen. Hydrogen enters the hydrogen fuel cell through the anode, and oxygen enters through the cathode. Under the action of the catalyst, an electrochemical reaction occurs to generate current and water vapor. Among them, the hydrogen fuel cell control unit (FCU) is the core control component of the hydrogen fuel cell system. It is responsible for monitoring the status of the hydrogen fuel cell (such as voltage, current, temperature, etc.), and adjusting the supply of hydrogen and oxygen and the flow rate of cooling water as needed to ensure the efficient and safe operation of the hydrogen fuel cell. However, most of the existing automobile power generation control methods are only oil vehicle power generation control methods, electric vehicle power generation control methods, or single-stack hydrogen fuel cell control methods. There is a lack of control methods for dual-stack hydrogen fuel cells, resulting in failures in dual-stack power generation. Summary of the invention

[0004] The purpose of the present invention is to provide a power generation control method for a dual-stack hydrogen fuel cell, aiming to improve the problem of lack of a control method for a dual-stack hydrogen fuel cell, which leads to malfunctions in dual-stack power generation.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A method for controlling power generation of a dual-stack hydrogen fuel cell comprises the following steps: S1. After the vehicle controller is powered on at low voltage, it sends a message key to the hydrogen stack to wake up the hydrogen stack; S2. After the hydrogen stack is purged, the hydrogen stack sends a power-on self-test message to the vehicle controller; S3. Determine whether the hydrogen stack self-test is normal. If the self-test is normal, send the hydrogen fuel cell MD_EN=1 to the vehicle controller. The vehicle controller sends the hydrogen fuel cell operation enable MD_RUN=1 to start the hydrogen stack. If the self-test is abnormal, the vehicle controller reports a fault and shuts down. S4. Start the engine; S5. The vehicle controller sends a control message to the hydrogen stack according to the power demand; S6. Determine whether the hydrogen stack has the load-carrying capacity. If it has the load-carrying capacity, execute step S7. If it does not have the load-carrying capacity, alarm and shut down; S7. Let the rated power of the first hydrogen stack be (A) kW, the rated power of the second hydrogen stack be (B) kW, and the required power be (C) kW. Judge the relationship between C and A, B, and (A + B). If C ≤ A, the first hydrogen stack outputs (C) kW; If A < C < B, the second hydrogen stack outputs (C) kW; If B < C < (A + B), the first hydrogen stack outputs (A) kW, and the second hydrogen stack outputs (C - A) kW.

[0006] Further, it also includes step S21. Check the engine status. If the engine status is normal, enter the sleep state and execute step S3. If the engine is abnormal, shut down and end the step.

[0007] Further, in step S3, if the self-check is normal, after sending hydrogen fuel cell MD_EN = 1 to the vehicle controller, the vehicle controller sends hydrogen fuel cell operation enable MD_RUN = 1, and at the same time, the vehicle controller controls the engine to enter the waiting state.

[0008] Further, it also includes step S31. Judge whether the vehicle controller sends the MD_RUN = 1 instruction for the first time. If so, the hydrogen stack controller feeds back the H2_EN hydrogen enable signal to the vehicle controller, and the vehicle controller controls hydrogen supply.

[0009] Further, in step S6, detect the heat of the hydrogen stack and detect the hydrogen content of the hydrogen stack to judge whether the hydrogen stack has the load-carrying capacity.

[0010] Further, it also includes step S71. Detect the status of the hydrogen stack and send a status message to the hydrogen stack controller. The hydrogen stack controller controls the hydrogen stack radiator, hydrogen supply system, and DC / DC cooling circuit to work.

[0011] Further, in step S4, the vehicle controller supplies power to the engine and engine auxiliaries to start the engine.

[0012] Further, it also includes step S8. The vehicle controller monitors the hydrogen stack controller in real time and conducts real-time interactive communication with the hydrogen stack controller.

[0013] After adopting the above technical solution, compared with the background technology, the present invention has the following advantages: The vehicle controller wakes up the hydrogen stack and starts the hydrogen stack after purging and self-testing. At the same time, the load capacity of the hydrogen stack is judged before loading to avoid overload and other faults. The first and second hydrogen stacks determine their own output power according to the required power. When the required power is small, the output of the first hydrogen stack with a smaller rated power is controlled to meet the required power requirements; when the required power is greater than the rated power of the first hydrogen stack and less than the rated power of the second hydrogen stack, the output of the second hydrogen stack is controlled to meet the required power requirements, reduce the number of output hydrogen stacks, slow down the overall temperature rise, and avoid affecting the continuity of system operation; when the required power is greater than the rated power of the second hydrogen stack, the first hydrogen stack is controlled to output at full power, and the second hydrogen stack outputs the difference between the required power and the rated power of the first hydrogen stack, avoiding the second hydrogen stack from outputting at full power, improving the overall output efficiency, and at the same time, the overall temperature rise is small, saving energy, and achieving orderly power generation of the dual stacks, avoiding overload, power output limitation, shutdown and other faults caused by unbalanced power generation of the dual stacks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flowchart of the power generation control method of the dual-stack hydrogen fuel cell described in the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0018] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances. Example

[0019] Please refer to Figure 1 As shown, this embodiment provides a power generation control method for a dual-stack hydrogen fuel cell, comprising the following steps: S1. After the vehicle controller is powered on at low voltage, it sends a message key to the hydrogen stack to wake up the hydrogen stack.

[0020] S2. After the hydrogen stack is purged, the hydrogen stack sends a power-on self-test message to the vehicle controller; purging the hydrogen stack before starting the hydrogen stack can effectively reduce the internal moisture residue, ensure that there are enough reaction channels for gas to pass through during cold start, and avoid residual air inside the hydrogen stack, which will cause backfire when starting the hydrogen stack and easily damage the battery.

[0021] S21. Check the engine status. If the engine status is normal, enter the sleep state and proceed to step S3. If the engine is abnormal, shut down and end the step. Detect the engine status in advance to avoid excessive energy loss caused by late detection time. Furthermore, if the engine is in normal state, it enters the sleep state, and proceeds to step S3 after a delay of Xs. In this embodiment, X=5, and the whole vehicle is powered on with high voltage to prepare for the subsequent power supply of the engine auxiliary machine, and the residual voltage of the hydrogen stack is depressurized by delaying.

[0022] S3. Determine whether the hydrogen stack self-test is normal. If the self-test is normal, send the hydrogen fuel cell MD_EN=1 to the vehicle controller. The vehicle controller sends the hydrogen fuel cell operation enable MD_RUN=1 to start the hydrogen stack. If the self-test is abnormal, the vehicle controller reports a fault and shuts down. S31. Determine whether the vehicle controller sends the MD_RUN=1 command for the first time. If so, the hydrogen stack controller feeds back the H2_EN hydrogen enable signal to the vehicle controller, and the vehicle controller controls the hydrogen supply to ensure a stable and sufficient hydrogen supply to the hydrogen stack.

[0023] S4. Start the engine; S5. The vehicle controller sends a control message to the hydrogen stack according to the power demand; S6. Determine whether the hydrogen stack has the loading capacity. If it has the loading capacity, execute step S7. If it does not have the loading capacity, an alarm is sounded; S61. Determine whether the required power is greater than the minimum output of the first hydrogen stack and the second hydrogen stack and less than the sum of the rated outputs of the first hydrogen stack and the second hydrogen stack. If the required power is less than the minimum output of the first hydrogen stack and the second hydrogen stack, an alarm is given after a 10-second delay, and an alarm is given again and the machine is stopped after a 20-second delay. Early warning of the working state is carried out through the delay to avoid suddenly entering the high-voltage state. If the required power is greater than the sum of the rated outputs of the first hydrogen stack and the second hydrogen stack, control the first hydrogen stack, the second hydrogen stack, and the battery to output full power. If the required power is greater than the sum of the full-power outputs of the first hydrogen stack, the second hydrogen stack, and the battery, an alarm is given and power is limited for operation. In this embodiment, the minimum output of the first hydrogen stack and the second hydrogen stack is determined according to the required power of the whole vehicle and the power generation power of the hydrogen stack.

[0024] S7. Let the rated power of the first hydrogen stack be (A) kW, the rated power of the second hydrogen stack be (B) kW, and the required power be (C) kW. Judge the relationship between C and A, B, and (A + B). If C ≤ A, the first hydrogen stack outputs (C) kW. If A < C < B, the second hydrogen stack outputs (C) kW. If B < C < (A + B), the first hydrogen stack outputs (A) kW, and the second hydrogen stack outputs (C - A) kW.

[0025] S71. Detect the state of the hydrogen stack and send a status message to the hydrogen stack controller. The hydrogen stack controller controls the hydrogen stack radiator, the hydrogen supply system, and the DC / DC cooling circuit to work. In this embodiment, step S7 and step S71 are carried out synchronously to detect the working state of the hydrogen stack in real time. The hydrogen stack controller dissipates heat from the hydrogen stack through the operation of the hydrogen stack radiator to avoid the temperature of the hydrogen stack being too high. When the hydrogen content in the hydrogen stack is low, the hydrogen stack controller adjusts the opening degree of the pipeline valve for hydrogen supply, thereby improving the hydrogen supply efficiency of the hydrogen supply system to the hydrogen stack and ensuring the continuity of the system operation. The hydrogen stack controller dissipates heat from the internal circuit through the DC / DC cooling circuit to ensure that the parameters of the hydrogen stack are kept within a reasonable range.

[0026] S8. The vehicle controller monitors the hydrogen stack controller in real time and conducts real-time interactive communication with the hydrogen stack controller. Avoid faults such as overload, power limit output, and reactor shutdown caused by uneven power generation of the first hydrogen stack and the second hydrogen stack.

[0027] The vehicle controller wakes up the hydrogen stack and starts the hydrogen stack after purging and self-testing. At the same time, the load capacity of the hydrogen stack is judged before loading to avoid overload and other faults. The first and second hydrogen stacks determine their own output power according to the required power. When the required power is small, the output of the first hydrogen stack with a smaller rated power is controlled to meet the required power requirements; when the required power is greater than the rated power of the first hydrogen stack and less than the rated power of the second hydrogen stack, the output of the second hydrogen stack is controlled to meet the required power requirements, reduce the number of output hydrogen stacks, slow down the overall temperature rise, and avoid affecting the continuity of system operation; when the required power is greater than the rated power of the second hydrogen stack, the first hydrogen stack is controlled to output at full power, and the second hydrogen stack outputs the difference between the required power and the rated power of the first hydrogen stack, avoiding the second hydrogen stack from outputting at full power, improving the overall output efficiency, and at the same time, the overall temperature rise is small, saving energy, and achieving orderly power generation of the dual stacks, avoiding overload, power output limitation, shutdown and other faults caused by unbalanced power generation of the dual stacks.

[0028] In this embodiment, in step S3, if the self-check is normal, the hydrogen fuel cell MD_EN=1 is sent to the vehicle controller, and the vehicle controller sends the operation enable MD_RUN=1 of the hydrogen fuel cell, and the vehicle controller controls the engine to enter the waiting state. That is, the vehicle controller sends the operation enable MD_RUN=1 of the electric battery, and controls the engine to enter the waiting state, thereby improving the starting efficiency of the engine.

[0029] In this embodiment, in step S4, the vehicle controller supplies power to the engine and the engine auxiliary machine, starts the engine, and ensures good communication between various components.

[0030] In this embodiment, in step S6, the heat of the hydrogen stack and the hydrogen content of the hydrogen stack are detected to determine whether the hydrogen stack has the load-carrying capacity. That is, by detecting the hydrogen content and heat of the hydrogen stack, it is determined whether the hydrogen stack has the load-carrying capacity. If the hydrogen content is too low and the hydrogen stack does not have the load-carrying capacity, the opening degree of the hydrogen supply pipeline valve is adjusted to improve the hydrogen supply efficiency of the hydrogen supply system to the hydrogen stack; if the heat of the hydrogen stack is too high and the hydrogen stack does not have the load-carrying capacity, the hydrogen stack radiator is controlled to dissipate the heat of the hydrogen stack. If the hydrogen stack does not have the load-carrying capacity, the hydrogen stack radiator and the hydrogen supply system are controlled to adjust the heat and hydrogen content of the hydrogen stack so that the hydrogen stack has the load-carrying capacity.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for controlling power generation of a dual-stack hydrogen fuel cell, characterized in that: It includes the following steps: S1. After the low-voltage power-on of the vehicle controller, it sends a message key to the hydrogen stack to wake up the hydrogen stack; S2. After purging the hydrogen stack, the hydrogen stack sends a power-on self-check message to the vehicle controller; S3. Determine whether the self-check of the hydrogen stack is normal. If the self-check is normal, send hydrogen fuel cell MD_EN = 1 to the vehicle controller, and the vehicle controller sends the operation enable MD_RUN = 1 of the hydrogen fuel cell to start the hydrogen stack. If the self-check is abnormal, the vehicle controller reports a fault and shuts down; S4. Start the engine; S5. The vehicle controller sends a control message to the hydrogen stack according to the power demand; S6. Determine whether the hydrogen stack has the load-carrying capacity. If it has the load-carrying capacity, execute step S7. If it does not have the load-carrying capacity, alarm and shut down; S7. Let the rated power of the first hydrogen stack be (A) kW, the rated power of the second hydrogen stack be (B) kW, and the required power be (C) kW. Judge the relationship between C and A, B, and (A + B), If C ≤ A, the first hydrogen stack outputs (C) kW; If A < C < B, the second hydrogen stack outputs (C) kW; If B < C < (A + B), the first hydrogen stack outputs (A) kW, and the second hydrogen stack outputs (C - A) kW.

2. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: It also includes step S21. Check the engine status. If the engine status is normal, enter the sleep state and execute step S3. If the engine is abnormal, shut down and end the step.

3. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: In step S3, if the self-check is normal and after sending hydrogen fuel cell MD_EN = 1 to the vehicle controller, the vehicle controller sends the operation enable MD_RUN = 1 of the hydrogen fuel cell, and at the same time the vehicle controller controls the engine to enter the waiting state.

4. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: It also includes step S31. Judge whether the vehicle controller sends the MD_RUN = 1 instruction for the first time. If so, the hydrogen stack controller feeds back the H2_EN hydrogen enable signal to the vehicle controller, and the vehicle controller controls hydrogen supply.

5. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: In step S6, detect the heat of the hydrogen stack and the hydrogen content of the hydrogen stack to judge whether the hydrogen stack has the load-carrying capacity.

6. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: It also includes step S71. Detect the status of the hydrogen stack and send a status message to the hydrogen stack controller, and the hydrogen stack controller controls the hydrogen stack radiator, hydrogen supply system, and DC / DC cooling circuit to work.

7. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: In step S4, the vehicle controller supplies power to the engine and engine auxiliaries to start the engine.

8. The power generation control method of a dual-stack hydrogen fuel cell according to claim 1, characterized in that: It also includes step S8. The vehicle controller monitors the hydrogen stack controller in real time and conducts real-time interactive communication with the hydrogen stack controller.

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