Control method of hydrogen storage system control unit and fuel cell automobile

Abstract

The invention discloses a control method of a hydrogen storage system control unit and a fuel cell automobile, and belongs to the technical field of fuel cell automobiles, and the control method of the hydrogen storage system control unit comprises the following steps: judging whether a whole automobile key is in a power-on state or not; if not, executing a second control method; the second control method comprises the following steps: S1, judging whether the fuel cell stack completes shutdown purging or not; if yes, executing the step S2; if not, executing the step S3; s2, controlling the hydrogen supply request signal to be zero, and controlling the hydrogen storage system control unit to be in a power-off state; and S3, controlling the hydrogen supply request signal to be 1, controlling the hydrogen storage system control unit to keep a power-on state, and executing the step S1 in real time. According to the invention, after the vehicle key is powered off, the hydrogen storage system can continuously supply hydrogen to the fuel cell stack, and normal shutdown of the fuel cell system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell vehicles, and in particular to a control method for a hydrogen storage system control unit and a fuel cell vehicle. Background Art

[0002] A fuel cell is a highly efficient power generation device that converts the chemical energy of fuel into electrical energy directly through electrochemical reactions without burning fuel. The fuel used by fuel cells is high-purity hydrogen or high-hydrogen reformed gas obtained by reforming hydrogen-containing fuel.

[0003] A fuel cell vehicle is a vehicle that uses electricity generated by a fuel cell as its power source. Several fuel cells are connected in series to form a fuel cell stack, which serves as the power source of the fuel cell vehicle. When the fuel cell vehicle is driving, the hydrogen storage system supplies hydrogen to the fuel cell stack. After the fuel cell vehicle is powered on, the fuel cell stack of the fuel cell system still needs hydrogen supply, but the hydrogen storage system has been shut down and stopped supplying hydrogen, which will cause the fuel cell system to fail to shut down normally. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for a hydrogen storage system control unit and a fuel cell vehicle, so as to solve the technical problem in the prior art that after the key of the fuel cell vehicle is turned off, the hydrogen storage system has been shut down and stops supplying hydrogen, resulting in the fuel cell system being unable to shut down normally.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A control method for a hydrogen storage system control unit comprises the following steps:

[0007] Determine whether the vehicle key is powered on; if not, execute the second control method;

[0008] The second control method comprises the following steps:

[0009] S1, determining whether the fuel cell stack has completed shutdown purging; if yes, executing step S2; if no, executing step S3;

[0010] S2, controlling the hydrogen supply request signal to be set to 0, and controlling the hydrogen storage system control unit to be in a power-off state;

[0011] S3, controlling the hydrogen supply request signal to be set to 1, and controlling the hydrogen storage system control unit to remain powered on, and executing step S1 in real time.

[0012] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, the second control method also includes a hydrogen supply request signal monitoring method, and the hydrogen supply request signal monitoring method includes the following steps:

[0013] Real-time detection of whether the hydrogen supply request signal is wrong;

[0014] If yes, a timer is triggered, and after the timer counts a first set time, the hydrogen storage system control unit is controlled to be in a power-off state;

[0015] If not, the timer does not perform the timing operation.

[0016] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, the real-time detection of whether the hydrogen supply request signal is wrong includes the following steps:

[0017] S01, determining whether the hydrogen supply request signal has timed out; if so, executing step S02; if not, executing step S03;

[0018] S02, determining whether the time interval between any two adjacent hydrogen supply request signals is not less than a second set time; if so, determining that the hydrogen supply request signal is erroneous; if not, determining that the hydrogen supply request signal is not erroneous;

[0019] S03: Determine that the hydrogen supply request signal is not erroneous.

[0020] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, the second set time is not greater than ten times the sending period of the hydrogen supply request signal.

[0021] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, the hydrogen supply request signal is set to 1, and when the hydrogen storage system control unit is controlled to remain in a powered-on state, the bottle valve of the hydrogen storage system is in an open state.

[0022] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, the hydrogen supply request signal is controlled to be set to 0, and when the hydrogen storage system control unit is controlled to be in a power-off state, the hydrogen storage system is controlled to enter a standby state, and the hydrogen storage system control unit is controlled to be in a power-off state.

[0023] As a preferred solution of the control method of the above-mentioned hydrogen storage system control unit, it is determined whether the vehicle key is powered on; if so, a first control method is executed; the first control method comprises the following steps:

[0024] Controlling the hydrogen storage system control unit to power on and enter a standby state;

[0025] Determining whether the fuel cell stack has a hydrogen supply demand;

[0026] If yes, the hydrogen supply request signal is controlled to be set to 1, and the bottle valve of the hydrogen storage system is controlled to be in an open hydrogen supply state;

[0027] If not, the hydrogen storage system control unit is controlled to maintain the standby state.

[0028] A fuel cell vehicle comprises a hydrogen storage system, wherein the hydrogen storage system comprises a hydrogen storage system control unit. The fuel cell vehicle adopts the above-mentioned control method of the hydrogen storage system control unit to control the hydrogen storage system control unit.

[0029] Beneficial effects of the present invention:

[0030] The control method of the hydrogen storage system control unit and the fuel cell vehicle proposed in the present invention can flexibly control the power-on and power-off states of the hydrogen storage system control unit.

[0031] When the vehicle key is powered off, the second control method is executed to control the power-on and power-off states of the hydrogen storage system control unit; when the vehicle key is powered off, the power-on and power-off states of the hydrogen storage system control unit are controlled according to whether the fuel cell stack has completed shutdown purging. If the fuel cell stack has completed shutdown purging, the hydrogen supply request signal is controlled to be 0, and the hydrogen storage system control unit is controlled to be powered off. At this time, the hydrogen supply system will no longer supply hydrogen to the fuel cell stack to avoid hydrogen waste; if the fuel cell stack has not completed shutdown purging, the hydrogen supply request signal is controlled to be 1, and the hydrogen storage system control unit is controlled to remain powered on, and step S1 is executed in real time. In this way, the normal shutdown of the fuel cell system is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a flow chart of a control method of a hydrogen storage system control unit provided in Embodiment 1 of the present invention;

[0033] Figure 2 is a flow chart of a first control method provided in Embodiment 1 of the present invention;

[0034] Figure 3 is a flow chart of a second control method provided in Embodiment 1 of the present invention;

[0035] Figure 4 is a flow chart of a method for monitoring a hydrogen supply request signal provided in Embodiment 1 of the present invention;

[0036] Figure 5 This is a flow chart for real-time detection of whether a hydrogen supply request signal is erroneous, provided in the first embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0038] See also Figure 1-Figure 4 This embodiment provides a control method for a hydrogen storage system control unit, which can control the power on or off of the hydrogen storage system control unit of a hydrogen storage system of a fuel cell vehicle.

[0039] Specifically, see Figure 1 and Figure 2 In this embodiment, the control method of the hydrogen storage system control unit includes the following steps:

[0040] Determine whether the vehicle key is powered on; if not, execute the second control method;

[0041] The second control method comprises the following steps:

[0042] S1, determining whether the fuel cell stack has completed shutdown purging; if yes, executing step S2; if no, executing step S3;

[0043] S2, control the hydrogen supply request signal to 0, and control the hydrogen storage system control unit to a power-off state;

[0044] S3, control the hydrogen supply request signal to be set to 1, and control the hydrogen storage system control unit to remain powered on, and execute step S1 in real time.

[0045] The control method of the hydrogen storage system control unit provided in this embodiment can flexibly control the power-on and power-off states of the hydrogen storage system control unit.

[0046] When the vehicle key is powered off, the second control method is executed to control the power-on and power-off states of the hydrogen storage system control unit; when the vehicle key is powered off, the power-on and power-off states of the hydrogen storage system control unit are controlled according to whether the fuel cell stack has completed shutdown purging. If the fuel cell stack has completed shutdown purging, the hydrogen supply request signal is controlled to be 0, and the hydrogen storage system control unit is controlled to be powered off. At this time, the hydrogen supply system will no longer supply hydrogen to the fuel cell stack to avoid hydrogen waste; if the fuel cell stack has not completed shutdown purging, the hydrogen supply request signal is controlled to be 1, and the hydrogen storage system control unit is controlled to remain powered on, and step S1 is executed in real time. In this way, the normal shutdown of the fuel cell system is guaranteed.

[0047] Specifically, see Figure 1 and Figure 3, determine whether the vehicle key is powered on; if so, execute the first control method. When the vehicle key is powered on, execute the first control method to control the power on and off state of the hydrogen storage system control unit.

[0048] The first control method comprises the following steps:

[0049] Control the hydrogen storage system control unit to power on and enter standby mode;

[0050] Determine whether the fuel cell stack has a hydrogen supply demand;

[0051] If yes, the hydrogen supply request signal is controlled to be set to 1, and the bottle valve of the hydrogen storage system is controlled to be in an open hydrogen supply state;

[0052] If not, the hydrogen storage system control unit is controlled to remain in standby mode.

[0053] Specifically, in this embodiment, when the hydrogen supply request signal is set to 1 and the hydrogen storage system control unit is controlled to remain in a powered-on state, the bottle valve of the hydrogen storage system is in an open state.

[0054] When the hydrogen supply request signal is controlled to be set to 0 and the hydrogen storage system control unit is controlled to be in a power-off state, the hydrogen storage system is controlled to enter a standby state and the hydrogen storage system control unit is controlled to be in a power-off state.

[0055] Specifically, when the hydrogen storage system enters the standby state, the bottle valve of the hydrogen storage system is in a closed state.

[0056] In order to avoid errors in the hydrogen supply request signal after the vehicle key is powered off, such as the hydrogen supply request signal being lost or reset, which may cause a logical failure of the fuel cell system and cause the hydrogen supply system to close the valve and power off prematurely or remain in the open valve and power-on state, in this embodiment, the second control method also includes a hydrogen supply request signal monitoring method.

[0057] Specifically, see Figure 4 The hydrogen supply request signal monitoring method comprises the following steps:

[0058] Real-time detection of whether the hydrogen supply request signal is wrong;

[0059] If yes, the timer is triggered, and after the timer counts the first set time, the hydrogen storage system control unit is controlled to be in a power-off state; in this step, the timer counts the first set time to ensure that after the vehicle key is powered off, even if the hydrogen supply request signal is wrong, the hydrogen supply system can ensure normal hydrogen supply to the fuel cell stack after the vehicle key is powered off, thereby ensuring normal shutdown of the fuel cell system; specifically, the first set time can be set as needed, and no excessive restrictions are made here;

[0060] If not, the timer does not perform the timing operation.

[0061] Further, see Figure 5 , real-time detection of whether the hydrogen supply request signal is wrong includes the following steps:

[0062] S01, determining whether the hydrogen supply request signal has timed out; if so, executing step S02; if not, executing step S03;

[0063] S02, determining whether the time interval between any two adjacent hydrogen supply request signals is not less than a second set time; if so, determining that the hydrogen supply request signal is erroneous; if not, determining that the hydrogen supply request signal is not erroneous;

[0064] More specifically, the second set time is not greater than ten times the hydrogen supply request signal transmission period; of course, in other embodiments, the second set time can also be set as needed;

[0065] S03. Determine that the hydrogen supply request signal is not erroneous.

[0066] Specifically, the hydrogen supply request signal transmission period is the time interval between two adjacent hydrogen supply request signals when the hydrogen supply request signal is normally transmitted (ie, when the signal is not lost).

[0067] In step S02, the time interval between any two adjacent hydrogen supply request signals is recorded. If the time interval between any two adjacent hydrogen supply request signals is greater than the hydrogen supply request signal transmission period, it means that a signal is lost between the two hydrogen supply request signals.

[0068] If the time interval between two adjacent hydrogen supply request signals is not less than the second set time, the hydrogen supply request signal is determined to be erroneous. Exemplarily, the second set time is ten times the hydrogen supply request signal sending period. If it is detected that the time interval between two adjacent hydrogen supply request signals is eleven times the hydrogen supply request signal sending period, it means that ten hydrogen supply request signals are lost between the two adjacent hydrogen supply request signals, which means that the loss duration of the hydrogen supply request signal is ten times the hydrogen supply request signal sending period, and the hydrogen supply request signal is determined to be erroneous; or the number of times the hydrogen supply request signal is lost is the number of hydrogen supply request signals that should be sent within ten times the hydrogen supply request signal sending period, and the hydrogen supply request signal is determined to be erroneous. Of course, in other embodiments, step S02 may also be:

[0069] Determine whether the number of times the hydrogen supply request signal is lost is not less than the number of times the hydrogen supply request signal should be sent within the second set time; if so, determine that the hydrogen supply request signal is erroneous; if not, determine that the hydrogen supply request signal is not erroneous; or

[0070] It is determined whether the loss duration of the hydrogen supply request signal is not less than the second set time; if so, it is determined that the hydrogen supply request signal is erroneous; if not, it is determined that the hydrogen supply request signal is not erroneous.

[0071] Specifically, in this embodiment, determining whether the fuel cell stack has completed shutdown purging includes the following steps:

[0072] It is determined whether the ohmic internal resistance of the fuel cell stack is not less than the internal resistance threshold; if so, it is determined that the fuel cell stack has completed shutdown purge; if not, it is determined that the fuel cell stack has not completed shutdown purge.

[0073] Furthermore, the fuel cell system includes a detection unit; the detection unit detects the instantaneous value of the ohmic internal resistance of the fuel cell stack to obtain the ohmic internal resistance of the fuel cell stack.

[0074] Embodiment 2

[0075] This embodiment provides a fuel cell vehicle, which includes a hydrogen storage system, the hydrogen storage system includes a hydrogen storage system control unit, and the fuel cell vehicle uses the control method of the hydrogen storage system control unit of the first embodiment to control the hydrogen storage system control unit.

[0076] The fuel cell vehicle provided in this embodiment can flexibly control the power-on and power-off states of the hydrogen storage system control unit.

[0077] When the vehicle key is powered on, the first control method is executed to control the power on and power off status of the hydrogen storage system control unit.

[0078] When the vehicle key is powered off, the second control method is executed to control the power-on and power-off states of the hydrogen storage system control unit; when the vehicle key is powered off, the power-on and power-off states of the hydrogen storage system control unit are controlled according to whether the fuel cell stack has completed shutdown purging. If the fuel cell stack has completed shutdown purging, the hydrogen supply request signal is controlled to be 0, and the hydrogen storage system control unit is controlled to be powered off. At this time, the hydrogen supply system will no longer supply hydrogen to the fuel cell stack to avoid hydrogen waste; if the fuel cell stack has not completed shutdown purging, the hydrogen supply request signal is controlled to be 1, and the hydrogen storage system control unit is controlled to remain powered on, and step S1 is executed in real time. In this way, the normal shutdown of the fuel cell system is guaranteed.

[0079] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A control method for a hydrogen storage system control unit, characterized in that: The following steps are involved: Determine whether the vehicle key is powered on; if not, execute the second control method; The second control method comprises the following steps: S1, determining whether the fuel cell stack has completed shutdown purging; If yes, execute step S2; if no, execute step S3; S2, controlling the hydrogen supply request signal to be set to 0, and controlling the hydrogen storage system control unit to be in a power-off state; S3, controlling the hydrogen supply request signal to be set to 1, and controlling the hydrogen storage system control unit to remain powered on, and executing step S1 in real time.

2. The control method of the hydrogen storage system control unit according to claim 1, characterized in that: The second control method further includes a hydrogen supply request signal monitoring method, and the hydrogen supply request signal monitoring method includes the following steps: Real-time detection of whether the hydrogen supply request signal is wrong; If yes, a timer is triggered, and after the timer counts a first set time, the hydrogen storage system control unit is controlled to be in a power-off state; If not, the timer does not perform the timing operation.

3. The control method of the hydrogen storage system control unit according to claim 2, characterized in that: The real-time detection of whether the hydrogen supply request signal is erroneous comprises the following steps: S01, determining whether the hydrogen supply request signal has timed out; if so, executing step S02; if not, executing step S03; S02, determining whether the time interval between any two adjacent hydrogen supply request signals is not less than a second set time; if so, determining that the hydrogen supply request signal is erroneous; if not, determining that the hydrogen supply request signal is not erroneous; S03: Determine that the hydrogen supply request signal is not erroneous.

4. The control method of the hydrogen storage system control unit according to claim 3, characterized in that: The second set time is not greater than ten times the sending period of the hydrogen supply request signal.

5. The control method of the hydrogen storage system control unit according to claim 1, characterized in that: The hydrogen supply request signal is set to 1, and when the hydrogen storage system control unit is controlled to remain in a powered-on state, the bottle valve of the hydrogen storage system is in an open state.

6. The control method of the hydrogen storage system control unit according to claim 1, characterized in that: When the hydrogen supply request signal is controlled to be set to 0 and the hydrogen storage system control unit is controlled to be in a power-off state, the hydrogen storage system is controlled to enter a standby state and the hydrogen storage system control unit is controlled to be in a power-off state.

7. The control method of the hydrogen storage system control unit according to any one of claims 1 to 6, characterized in that: Determine whether the vehicle key is powered on; if so, execute the first control method; the first control method includes the following steps: Controlling the hydrogen storage system control unit to power on and enter a standby state; Determining whether the fuel cell stack has a hydrogen supply demand; If yes, the hydrogen supply request signal is controlled to be set to 1, and the bottle valve of the hydrogen storage system is controlled to be in an open hydrogen supply state; If not, the hydrogen storage system control unit is controlled to maintain the standby state.

8. A fuel cell vehicle, comprising a hydrogen storage system, wherein the hydrogen storage system comprises a hydrogen storage system control unit, characterized in that: The fuel cell vehicle controls the hydrogen storage system control unit using the control method of the hydrogen storage system control unit as described in any one of claims 1 to 7.

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