Control system for vehicle, vehicle and startup and shutdown method

Abstract

The invention relates to a control system for a vehicle, the vehicle and a startup and shutdown method. The system comprises a power battery module, a whole vehicle control module and a fuel cell system control module. The power battery module is connected with the whole vehicle control module through a BMSEN, and a K2 first contact, a normally-closed contact switch, a second voltage acquisition point and a voltage output contact are sequentially arranged on the BMSEN; a BMSVC is arranged between the power battery module and the voltage output contact, and a K2 second contact, an emergency stop switch, a first voltage acquisition point and a whole vehicle key switch are sequentially arranged on the BMSVC; a normally open contact switch is arranged between the K2 first contact and the K2 second contact; and the fuel cell system control module is electrically connected with the first voltage acquisition point and the second voltage acquisition point to acquire voltage signals, and is in electric control connection with the normally closed contact switch and the normally open contact switch. Compared with the prior art, the functions of sudden stop and delayed shutdown of the fuel cell system are realized under the condition that a battery power supply does not need to be additionally configured for the fuel cell control module.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cell control, and relates to a control system for a vehicle, a vehicle, and a power on / off method. Background Art

[0002] With the continuous development of fuel cell technology, fuel cell models have become the main trend of domestic development. At present, the domestic and foreign markets of hydrogen fuel cell vehicles are mainly based on the "electric-electric hybrid" model, that is, a hybrid model with fuel cells as the main and power batteries as the auxiliary. Since the development of domestic fuel cell technology is just starting, the main components still need to rely on imports, so the cost is expensive.

[0003] Chinese patent application CN114987291A discloses a control system for forklifts equipped with hydrogen fuel cells, including a vehicle system and a hydrogen fuel cell system, wherein the hydrogen fuel cell system is electrically connected to the vehicle system, the hydrogen fuel cell system is provided with a fuel cell control unit, the fuel cell control unit is connected to a battery management module, the fuel cell control unit is connected to a power system, the power system is connected to a DC conversion system, the DC conversion system is electrically connected to the vehicle system, and the fuel cell control unit is connected to the vehicle system via a communication cable, which has the advantages of increasing the service life of hydrogen fuel cells. However, due to the fact that in this type of control system, such as Figure 1 As shown, when the control circuit is turned on, it first passes through the delay module, controls the power supply of the fuel cell control module through the delay module, and then drives the main output discharge relay of the power battery, and then the whole vehicle is started, resulting in a long start-up time for the whole vehicle and complicated circuit control. Summary of the invention

[0004] The purpose of the present invention is to provide a control system for a vehicle, a vehicle and a power on / off method, which can realize the functions of emergency stop and delayed shutdown of the fuel cell system with minimal changes to the original vehicle control logic circuit.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A first aspect of the present invention provides a control system for a vehicle, comprising a power battery module, a vehicle control module and a fuel cell system control module;

[0007] The power battery module and the vehicle control module are connected through a power battery operation control enabling harness, and a K2 first contact, a normally closed contact switch, a second voltage collection point, and a voltage output contact are sequentially arranged on the power battery operation control enabling harness;

[0008] A power battery control voltage output harness is provided between the power battery module and the voltage output contact, and a K2 second contact, an emergency stop switch, a first voltage collection point, and a vehicle key switch are sequentially provided on the power battery control voltage output harness;

[0009] A normally open contact switch is provided between the first contact point of K2 and the second contact point of K2;

[0010] The fuel cell system control module is electrically connected to the first voltage collection point and the second voltage collection point to collect voltage signals, and is electrically controlled to the normally closed contact switch and the normally open contact switch.

[0011] Furthermore, the normally open contact switch is a relay normally open contact switch.

[0012] Furthermore, the normally closed contact switch is a relay normally closed contact switch.

[0013] Furthermore, a grounding harness is provided between the power battery module and the vehicle control module.

[0014] Furthermore, the power battery module also includes a power battery output main contactor and a power supply bus.

[0015] A second aspect of the present invention provides a vehicle comprising the control system.

[0016] A third aspect of the present invention provides a startup method based on the control system, comprising:

[0017] When the vehicle key switch is closed, the power battery operation control enabling harness is connected to the power battery control voltage output harness, the power battery operation control enabling harness is energized, the power battery output main contactor is attracted, and the power power bus is energized;

[0018] The power supply end of the fuel cell system control module obtains power from the power supply bus and detects that there is power at the first voltage collection point and the second voltage collection point;

[0019] The fuel cell system control module controls the normally open contact switch to close, delays the normally closed contact switch to open, and the vehicle control module is powered on. The fuel cell system control module controls the fuel cell system to start and generate electricity according to the fuel cell system startup steps.

[0020] A fourth aspect of the present invention provides a shutdown mode determination method based on the control system, wherein after startup, the emergency switch and the normally open contact switch are closed, and the normally closed contact switch is controlled to be disconnected;

[0021] The shutdown mode detection methods include:

[0022] When the first voltage collection point remains powered and the second voltage collection point loses power, it is determined that the vehicle is shut down by the vehicle key switch;

[0023] When both the first voltage collection point and the second voltage collection point lose power, it is determined that the machine is shut down through the emergency switch.

[0024] A fifth aspect of the present invention provides a delayed shutdown method based on the control system, wherein after startup, the emergency switch and the normally open contact switch are closed, and the normally closed contact switch is controlled to be disconnected;

[0025] Delayed shutdown methods include:

[0026] When the vehicle key switch is turned off, the fuel cell system control module detects that the first voltage collection point remains powered and the second voltage collection point loses power, and then controls the fuel cell to shut down normally, disconnects the normally open contact switch, and disconnects the power battery operation control enable harness and the power battery control voltage output harness, causing power loss;

[0027] The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, and the fuel cell control module stops working.

[0028] A sixth aspect of the present invention provides a delayed shutdown method based on the control system, wherein after startup, the emergency switch and the normally open contact switch are closed, and the normally closed contact switch is controlled to be disconnected;

[0029] Delayed shutdown methods include:

[0030] When the emergency switch is disconnected, the fuel cell system control module detects that the first voltage collection point and the second voltage collection point are powered off, and the fuel cell control module starts the emergency shutdown program, quickly shuts down the fuel cell, and disconnects the normally open contact switch, and the power battery operation control enable harness is disconnected from the power battery control voltage output harness and loses power;

[0031] The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, and the fuel cell control module stops working.

[0032] Compared with the prior art, the present invention has the following characteristics:

[0033] 1) The present invention makes little change to the circuit of the original control power battery of the whole vehicle. By using two relays, namely K1 and K2, the original control logic circuit of the whole vehicle is slightly changed to realize the functions of emergency stop and delayed shutdown of the fuel cell system, and the normal shutdown process operation of the fuel cell system can be ensured, and there is no need to configure a battery power supply for the fuel cell control module;

[0034] 2) For the application of fuel cell systems, the present invention delays shutdown and continues to draw power from the main contactor power bus after stopping the fuel cell to ensure that the air compressor purges the fuel cell stack during normal shutdown, provides dry air to the cathode and anode cavities in the fuel cell, blows water generated during the reaction out of the stack, and ensures a dry environment in the internal cavity of the stack, thereby avoiding damage to the internal cavity structure of the fuel cell due to water freezing in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A control circuit diagram for a control system of a vehicle;

[0036] Figure 2 The figure is a control circuit diagram of a control system for a vehicle in an embodiment.

[0037] Description of the markings in the figure:

[0038] BMS_EN-power battery working control enable harness; BMS_VC-power battery control voltage output harness; Vs1-first voltage collection point; Vs2-second voltage collection point; K1-normally closed contact switch; K2-normally open contact switch; GND-ground harness. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0040] In the following examples, unless otherwise specified, raw materials, reagents or processing techniques are all conventional commercial products or conventional processing techniques in the art.

[0041] Embodiment 1:

[0042] like Figure 2A control system for a vehicle shown in the figure comprises a power battery module, a vehicle control module and a fuel cell system control module; the power battery module and the vehicle control module are connected via a power battery operation control enabling harness BMS_EN, and a first contact K2, a normally closed contact switch K1, a second voltage collection point Vs2 and a voltage output contact are sequentially arranged on the power battery operation control enabling harness BMS_EN; a power battery control voltage output harness BMS_VC is arranged between the power battery module and the voltage output contact, and a second contact K2, an emergency stop switch, a first voltage collection point Vs1 and a vehicle key switch are sequentially arranged on the power battery control voltage output harness BMS_VC; a normally open contact K2 is arranged between the first contact K2 and the second contact K2 point switch K2; the fuel cell system control module is electrically connected to the first voltage collection point Vs1 and the second voltage collection point Vs2 to collect voltage signals, and is electrically connected to the normally closed contact switch K1 and the normally open contact switch K2, so that when the vehicle key switch is closed to start the machine, the first voltage collection point Vs1 and the second voltage collection point Vs2 are energized, the normally open contact switch K2 is closed, and the normally closed contact switch K1 is disconnected; when the vehicle key switch is disconnected to shut down the machine, the first voltage collection point Vs1 remains energized, the second voltage collection point Vs2 loses power, and the normally open contact switch K2 is disconnected; when the emergency stop switch is disconnected to shut down the machine, the first voltage collection point Vs1 and the second voltage collection point Vs2 lose power, and the normally open contact switch K2 is disconnected.

[0043] In some specific embodiments, the normally open contact switch K2 is a relay normally open contact switch.

[0044] In some specific embodiments, the normally closed contact switch K1 is a relay normally closed contact switch.

[0045] In some specific embodiments, a grounding harness GND is further provided between the power battery module and the vehicle control module.

[0046] In some specific embodiments, the power battery module further includes a power battery output main contactor and a power supply bus.

[0047] Embodiment 2:

[0048] A 3.5T counterbalanced heavy hydrogen forklift, comprising the control system in Example 1.

[0049] Embodiment 3:

[0050] A startup method based on the control system in Embodiment 1, comprising:

[0051] When the vehicle key switch is closed, the power battery operation control enabling harness BMS_EN is connected to the power battery control voltage output harness BMS_VC, the power battery operation control enabling harness BMS_EN is energized, the power battery output main contactor is attracted, and the power supply bus is energized;

[0052] The power supply end of the fuel cell system control module starts working after receiving power from the power supply bus, and detects that there is power at the first voltage collection point Vs1 and the second voltage collection point Vs2;

[0053] The fuel cell system control module controls the normally open contact switch K2 to close, and controls the normally closed contact switch K1 to open after a delay. The vehicle control module is powered on and starts working. The fuel cell system control module controls the fuel cell system to start and generate electricity according to the fuel cell system startup steps. At the same time, the fuel cell control module detects the voltage of ⑤Vs1 and ⑥Vs2 in real time to determine the switch status of the emergency stop switch and the key switch.

[0054] A shutdown mode judgment method based on the control system in Example 1. After startup, the emergency switch and the normally open contact switch K2 are closed, and the normally closed contact switch K1 is controlled to be disconnected. At this time, the first voltage collection point Vs1 and the second voltage collection point Vs2 remain powered, and the voltage of BMS_VC can be detected normally.

[0055] The shutdown mode detection methods include:

[0056] When the first voltage collection point Vs1 remains powered and the second voltage collection point Vs2 loses power, it is determined that the vehicle is shut down by the vehicle key switch;

[0057] When both the first voltage collection point Vs1 and the second voltage collection point Vs2 lose power, it is determined that the machine is shut down through the emergency switch.

[0058] A delayed shutdown method based on the control system in Example 1, comprising:

[0059] When the vehicle key switch is turned off, because the normally closed contact switch K1 has been turned off during the previous startup process, the normally open contact switch K2 will not detect the BMS_VC voltage, but the first voltage collection point Vs1 can detect the BMS_VC voltage. At this time, the fuel cell control module will determine that the vehicle has performed a normal key shutdown operation, and then control the fuel cell to shut down normally, including completing the fuel cell stack to shut down the hydrogen source, shut down the DCDC power output, and perform stack purge actions. After the fuel cell system completes the fuel cell process action, the normally open contact switch K2 is disconnected, and the power battery operation control enable harness BMS_EN and the power battery control voltage output harness BMS_VC are disconnected and lose power;

[0060] The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, the fuel cell control module stops working, and the open contact switch K2 and the normally closed contact switch K1 return to the power-off state.

[0061] A delayed shutdown method based on the control system in Example 1, comprising:

[0062] When the vehicle operator performs an emergency operation in an abnormal working condition and performs a forced shutdown operation by pressing the emergency switch, the fuel cell system control module detects that the first voltage collection point Vs1 and the second voltage collection point Vs2 are powered off, that is, the BMS_VC voltage cannot be measured at the first voltage collection point Vs1 and the second voltage collection point Vs2. The fuel cell control module determines that the vehicle has performed an emergency stop operation, starts the emergency shutdown procedure, quickly shuts down the fuel cell, and disconnects the normally open contact switch K2. The power battery operation control enable harness BMS_EN is disconnected from the power battery control voltage output harness BMS_VC and quickly loses power;

[0063] The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, and the fuel cell control module stops working.

[0064] The shutdown control strategy of the existing fuel cell system requires an additional power supply to independently power the fuel cell control module circuit to ensure normal control operation after the vehicle is shut down, which leads to a complex system structure and cumbersome control strategy. The present invention solves this problem by switching the control right of the main electrical contactor. In the shutdown state, the main contactor is controlled by the vehicle control key. After the main contactor is turned on, it is controlled by the fuel cell main controller. The power for the delayed shutdown after the key shutdown action is still drawn from the bus on the main contactor.

[0065] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A control system for a vehicle, characterized in that: Including power battery module, vehicle control module and fuel cell system control module; The power battery module is connected to the vehicle control module through a power battery operation control enabling harness (BMS_EN), and a first contact K2, a normally closed contact switch (K1), a second voltage collection point (Vs2), and a voltage output contact are sequentially arranged on the power battery operation control enabling harness (BMS_EN); A power battery control voltage output harness (BMS_VC) is provided between the power battery module and the voltage output contact, and a K2 second contact, an emergency stop switch, a first voltage collection point (Vs1), and a vehicle key switch are sequentially provided on the power battery control voltage output harness (BMS_VC); A normally open contact switch (K2) is provided between the first contact point K2 and the second contact point K2; The fuel cell system control module is electrically connected to a first voltage collection point (Vs1) and a second voltage collection point (Vs2) to collect voltage signals, and is electrically connected to a normally closed contact switch (K1) and a normally open contact switch (K2).

2. The control system for a vehicle according to claim 1, characterized in that: The normally open contact switch (K2) is a relay normally open contact switch.

3. The control system for a vehicle according to claim 1, characterized in that: The normally closed contact switch (K1) is a relay normally closed contact switch.

4. The control system for a vehicle according to claim 1, characterized in that: A grounding harness (GND) is also provided between the power battery module and the vehicle control module.

5. The control system for a vehicle according to claim 1, characterized in that: The power battery module also includes a power battery output main contactor and a power supply bus.

6. A vehicle, characterized in that: Comprising a control system as claimed in any one of claims 1 to 5.

7. A startup method based on the control system according to any one of claims 1 to 5, characterized in that: include: When the vehicle key switch is closed, the power battery operation control enable harness (BMS_EN) is connected to the power battery control voltage output harness (BMS_VC), the power battery operation control enable harness (BMS_EN) is energized, the power battery output main contactor is attracted, and the power supply bus is energized; The power supply end of the fuel cell system control module obtains power from the power supply bus and detects that there is power at the first voltage collection point (Vs1) and the second voltage collection point (Vs2); The fuel cell system control module controls the normally open contact switch (K2) to close, delays the normally closed contact switch (K1) to open, and the vehicle control module is powered on. The fuel cell system control module controls the fuel cell system to start and generate electricity according to the fuel cell system startup steps.

8. A method for determining a shutdown mode based on the control system according to any one of claims 1 to 5, characterized in that: After starting up, the emergency switch and the normally open contact switch (K2) are closed, and the normally closed contact switch (K1) is controlled to be disconnected; The shutdown mode detection methods include: When the first voltage collection point (Vs1) remains powered and the second voltage collection point (Vs2) loses power, it is determined that the vehicle is shut down by the vehicle key switch; When both the first voltage collection point (Vs1) and the second voltage collection point (Vs2) lose power, it is determined that the machine is shut down through the emergency switch.

9. A delayed shutdown method based on the control system according to any one of claims 1 to 6, characterized in that: After starting up, the emergency switch and the normally open contact switch (K2) are closed, and the normally closed contact switch (K1) is controlled to be disconnected; Delayed shutdown methods include: When the vehicle key switch is turned off, the fuel cell system control module detects that the first voltage collection point (Vs1) remains energized and the second voltage collection point (Vs2) loses power, and then controls the fuel cell to shut down normally, disconnects the normally open contact switch (K2), and disconnects the power battery operation control enable harness (BMS_EN) and the power battery control voltage output harness (BMS_VC) to lose power; The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, and the fuel cell control module stops working.

10. A delayed shutdown method based on the control system according to any one of claims 1 to 6, characterized in that: After starting up, the emergency switch and the normally open contact switch (K2) are closed, and the normally closed contact switch (K1) is controlled to be disconnected; Delayed shutdown methods include: When the emergency switch is disconnected, the fuel cell system control module detects that the first voltage collection point (Vs1) and the second voltage collection point (Vs2) are powered off, and the fuel cell control module starts the emergency shutdown program, quickly shuts down the fuel cell, and disconnects the normally open contact switch (K2), and the power battery operation control enable harness (BMS_EN) and the power battery control voltage output harness (BMS_VC) are disconnected and powered off; The power battery disconnects the output main contactor, the power supply bus is powered off, the power supply of the fuel cell control module is lost, and the fuel cell control module stops working.

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