Fuel cell system on-line activation and polarization curve loading control method and system

Abstract

The invention discloses a fuel cell system on-line activation and polarization curve loading control method and system, and belongs to the technical field of fuel cells, and the method comprises the steps that a whole vehicle is powered on, a low-voltage part is activated, and a whole vehicle controller receives a fuel cell system on-line activation instruction signal or a fuel cell system polarization curve on-line loading instruction signal; wherein the priority of the fuel cell system polarization curve on-line load pulling instruction signal is higher than that of the fuel cell system on-line activation instruction signal; the vehicle control unit judges whether to enter a fuel cell system online activation mode or a fuel cell system polarization curve online load pulling mode or not in combination with a control means of the vehicle control unit; and the vehicle control unit makes a corresponding current request for the fuel cell system according to the entered corresponding mode. According to the invention, activation and polarization curve loading of the fuel cell system can be realized without arriving at the site by a technician, and the after-sales service cost of the whole vehicle is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fuel cell, and particularly relates to a method and system for online activation and polarization curve load control of a fuel cell system. BACKGROUND

[0002] The statements herein merely provide background technology related to the present application, and do not necessarily constitute prior art.

[0003] Currently, fuel cell vehicles are developing rapidly. As a host manufacturer, the life of the fuel cell system needs to be comprehensively monitored every certain period of time. The host manufacturer or supplier usually needs to send personnel to the site to perform polarization curve load on the fuel cell system to obtain data for analyzing the life attenuation of the fuel cell system. In addition, according to the actual operation situation, the fuel cell vehicle runs in pure electric mode for a large proportion, and the fuel cell system is in shutdown state for a long time, resulting in poor performance. When the fuel cell system is started again, it needs to be activated. The supplier usually needs to send personnel to the site to perform activation on the fuel cell system. However, the service cost of the after-sales mode of activating or performing polarization curve load by the technical personnel arriving at the site is high, and the after-sales service can only be performed on the vehicle on site one by one, so the after-sales service efficiency is low. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a method and system for online activation and polarization curve load control of a fuel cell system. When the vehicle-mounted fuel cell system is not operated for a long time, resulting in low single cell voltage and the need for activation, or the host manufacturer needs to monitor the life attenuation of the fuel cell system at each characteristic current point on the polarization curve, the activation and polarization curve load of the fuel cell system can be realized without the technical personnel arriving at the site, thereby effectively reducing the after-sales service cost of the vehicle.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme: In a first aspect, the technical scheme of the present application provides a method for online activation and polarization curve load control of a fuel cell system, comprising: The vehicle is powered on, the low-voltage components are activated, and the vehicle controller receives an online activation instruction signal of the fuel cell system or an online polarization curve load instruction signal of the fuel cell system. The priority of the online polarization curve load instruction signal of the fuel cell system is higher than that of the online activation instruction signal of the fuel cell system. The vehicle controller determines whether to enter the online activation mode of the fuel cell system or the online polarization curve load mode of the fuel cell system in combination with its own control means. The vehicle controller performs a corresponding current request on the fuel cell system according to the corresponding mode entered.

[0006] In at least one embodiment, the fuel cell system online activation instruction signal is specifically: receiving a signal of repeatedly pressing the snow mode switch of the instrument cluster for a first set number of times within a first set time and timing a set delay time.

[0007] In at least one embodiment, the fuel cell system polarization curve load instruction signal is specifically: receiving a signal of repeatedly pressing the snow mode switch of the instrument cluster for a second set number of times within a second set time.

[0008] In at least one embodiment, the time of the first set time and the set delay time is greater than the second set time.

[0009] In at least one embodiment, the vehicle controller judges whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode in combination with its own control means, which is specifically: when the vehicle receives the fuel cell system polarization curve load instruction or the online activation instruction, if the driver has the intention to start the fuel cell system and the vehicle controller sends a start instruction to the fuel cell system, the vehicle controller enters the fuel cell system online activation mode or the fuel cell system polarization curve online load mode according to the received instruction.

[0010] In at least one embodiment, the fuel cell system online activation mode and the fuel cell system polarization curve online load mode are fuel cell current request modes.

[0011] In at least one embodiment, after entering the fuel cell system online activation mode, the vehicle controller activates the fuel cell system through the current request mode, the minimum current is the fuel cell system idle current, the maximum current is the fuel cell system rated current, the activation starts from the minimum current, the current activation growth gradient is m amperes, and when the fuel cell single cell voltage exceeds p volts at the current activation current and the maintenance time exceeds y minutes, the next current activation period is entered; after the activation is completed, the vehicle controller enters the power request of the fuel cell system through the power request mode based on the power battery SOC.

[0012] In at least one embodiment, after entering the fuel cell system polarization curve load mode, the vehicle controller requests the current of the fuel cell system, the minimum current is the fuel cell system idle current, the maximum current is the fuel cell system rated current, the polarization load starts from the minimum current, the current load growth gradient is n amperes, and the load time of each current point is x minutes; after the load is completed, the vehicle controller enters the power request of the fuel cell system through the power request mode based on the power battery SOC.

[0013] In a second aspect, the technical scheme of the present application also provides a fuel cell system online activation and polarization curve load control system, comprising a vehicle controller, wherein the vehicle controller is configured to: When the vehicle is powered on and low-voltage components are activated, the fuel cell system online activation instruction signal or the fuel cell system polarization curve online load instruction signal is received, wherein the fuel cell system polarization curve online load instruction signal has a higher priority than the fuel cell system online activation instruction signal. Whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode is determined in combination with the control means. According to the entered corresponding mode, the fuel cell system is subjected to corresponding current request.

[0014] In a third aspect, the technical scheme of the present application also provides a fuel cell bus, which adopts the fuel cell system online activation and polarization curve load control system, comprising a vehicle controller, wherein the vehicle controller is configured to: When the vehicle is powered on and low-voltage components are activated, the fuel cell system online activation instruction signal or the fuel cell system polarization curve online load instruction signal is received, wherein the fuel cell system polarization curve online load instruction signal has a higher priority than the fuel cell system online activation instruction signal. Whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode is determined in combination with the control means. According to the entered corresponding mode, the fuel cell system is subjected to corresponding current request.

[0015] The beneficial effects of the technical scheme of the present application are as follows: The fuel cell system online activation and polarization curve load control method of the present application realizes that when the vehicle-mounted fuel cell system is not operated for a long time, the single cell voltage is low and needs to be activated, or the host factory needs to monitor the life attenuation of each characteristic current point of the fuel cell system on the polarization curve, the vehicle controller enters the fuel cell system online activation mode or the fuel cell system polarization curve online load mode in combination with the control means after receiving the instruction signal, without the need for technical personnel to arrive at the scene in person, the activation and polarization curve load of the fuel cell system can be realized, the after-sales service cost of the vehicle is effectively reduced, the after-sales service efficiency is improved, and no additional instrument switch needs to be added, which has superior adaptability and generalizability. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof and serve to provide further understanding of the present application, the exemplary embodiments of the present application and the explanations thereof serve to explain the present application, and do not constitute improper limitations on the present application.

[0017] Figure 1is a schematic diagram of the fuel cell system online activation and polarization curve load control method disclosed in embodiment 1 of the present application. DETAILED DESCRIPTION

[0018] It should be noted that the following detailed description is exemplary and is intended to further provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0019] As introduced in the background, the purpose of the present application is to overcome the shortcomings of the prior art, and to provide a fuel cell system online activation and polarization curve load control method and system. When the vehicle-mounted fuel cell system is not operated for a long time, resulting in low single voltage and requiring activation treatment, or the host factory needs to monitor the life attenuation of each characteristic current point of the fuel cell system on the polarization curve, the activation and polarization curve load of the fuel cell system can be realized without the need for technical personnel to arrive on site, effectively reducing the after-sales service cost of the vehicle.

[0020] Embodiment 1 In a typical embodiment of the present application, as shown in Figure 1 The present embodiment discloses a fuel cell system online activation and polarization curve load control method, comprising: S100. The vehicle is powered on, the low-voltage components are activated, and the vehicle controller receives a fuel cell system online activation instruction signal or a fuel cell system polarization curve online load instruction signal; wherein the fuel cell system polarization curve online load instruction signal has higher priority than the fuel cell system online activation instruction signal; S200. The vehicle controller determines whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode in combination with its own control means; S300. The vehicle controller performs corresponding current request on the fuel cell system according to the corresponding mode entered.

[0021] The fuel cell system online activation and polarization curve load control method is described in detail below through a specific embodiment.

[0022] In step S100, the fuel cell system online activation instruction signal is specifically a signal received by repeatedly pressing the snow mode switch for a first set number N1 of times (such as 2-4 times) within a first set time T1 (such as 4-6 seconds) and timing a set delay time t (such as 6-8 seconds); and the fuel cell system polarization curve online load instruction is specifically a signal received by repeatedly pressing the snow mode switch for a second set number N2 of times (such as 5-7 times) within a second set time T2 (such as 9-11 seconds). The setting of these two instruction signals does not need to add any additional instrument switch, but can be realized by the simple way of regularly operating the existing switch of the whole vehicle according to the rules to send the fuel cell system online activation instruction signal or the fuel cell system polarization curve online load instruction signal.

[0023] In this embodiment, in order to more conveniently distinguish the fuel cell system online activation instruction signal and the fuel cell system polarization curve online load instruction signal, it is provided that the time of the first set time T1 and the set delay time t is greater than the second set time T2.

[0024] In this embodiment, the fuel cell system polarization curve online load instruction signal has a higher priority than the fuel cell system online activation instruction signal, which means that when the whole vehicle controller receives the fuel cell system polarization curve online load instruction, the command of the fuel cell system online activation instruction is no longer executed. That is, when the whole vehicle controller receives the fuel cell system online activation instruction signal first, the delay time t starts timing, and if the whole vehicle does not receive the fuel cell system polarization curve online load instruction signal within the set delay time, the whole vehicle controller judges that the received signal is the fuel cell system online activation instruction signal and executes the corresponding command; if the whole vehicle receives the fuel cell system polarization curve online load instruction signal within the set delay time, the command of the fuel cell system polarization curve online load instruction signal is executed.

[0025] In addition, in this embodiment, the prerequisite for implementing step S100 is that the whole vehicle satisfies the fuel cell system start-up condition and sends a start-up instruction to the fuel cell system, so as to ensure the successful implementation of the polarization curve online load instruction and the online activation instruction.

[0026] In step S200, the whole vehicle controller judges whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode in combination with its own control means, which means that when the whole vehicle receives the fuel cell system polarization curve online load instruction or the fuel cell system online activation instruction, if the driver has the intention of starting up the fuel cell system and the whole vehicle controller sends a start-up instruction to the fuel cell system, the whole vehicle controller enters the fuel cell system online activation mode or the fuel cell system polarization curve online load mode according to the received instruction.

[0027] In the embodiment, the fuel cell system online activation mode and the fuel cell system polarization curve online load mode are current request modes, so that the load data can be analyzed more conveniently and the vehicle after-sales service efficiency is improved.

[0028] In step S300, after the vehicle controller determines to enter the fuel cell system online activation mode, the vehicle controller activates the fuel cell system online through the current request mode, the minimum current is the fuel cell system idle current, the maximum current is the fuel cell system rated current, the activation starts from the minimum current, the current activation growth gradient is m amperes (such as 10A-30A), and when the fuel cell single cell voltage exceeds p volts (such as 0.6V-0.62V) at the current activation current and the maintenance time exceeds y minutes (such as 3min-5min), the next current activation period can be entered; after the activation is completed, the vehicle controller enters the power request of the fuel cell system through the power request mode based on the power battery SOC.

[0029] After the vehicle controller determines to enter the fuel cell system polarization curve load mode, the vehicle controller requests the current of the fuel cell system, the minimum current is the fuel cell system idle current, the maximum current is the fuel cell system rated current, the polarization load starts from the minimum current, the current load growth gradient is n amperes (such as 30A-50A), and the load time of each current point is x minutes (such as 4min-6min); after the load is completed, the vehicle controller enters the power request of the fuel cell system through the power request mode based on the power battery SOC.

[0030] In the embodiment, the fuel cell system online activation and polarization curve load control method realizes that when the vehicle-mounted fuel cell system is not operated for a long time to cause the single cell voltage to be low and need to be activated or the host factory needs to monitor the life attenuation of each characteristic current point of the fuel cell system on the polarization curve, the vehicle controller enters the fuel cell system online activation mode or the fuel cell system polarization curve load mode through receiving an instruction signal and combining the self-control means, the activation and polarization curve load of the fuel cell system can be realized without the need of technicians to arrive at the scene, the vehicle after-sales service cost is effectively reduced, the after-sales service efficiency is improved, and any additional instrument switch is not needed, so that the adaptability and generalizability are better.

[0031] Embodiment 2 In a typical embodiment of the present application, the embodiment discloses a fuel cell system online activation and polarization curve load control system, which comprises a vehicle controller, the vehicle controller is configured to: The whole vehicle is powered on, low-voltage components are activated, and an online activation instruction signal of the fuel cell system or an online polarization curve load instruction signal of the fuel cell system is received; wherein the online polarization curve load instruction signal of the fuel cell system has a higher priority than the online activation instruction signal of the fuel cell system; Whether to enter the online activation mode of the fuel cell system or the online polarization curve load mode of the fuel cell system is determined in combination with self-control means; According to the entered corresponding mode, a corresponding current request is made to the fuel cell system.

[0032] Embodiment 3 In a typical embodiment of the present application, the embodiment provides a fuel cell bus, which adopts the fuel cell system online activation and polarization curve load control system introduced in Embodiment 2, and comprises a vehicle controller, which is configured to: The whole vehicle is powered on, low-voltage components are activated, and an online activation instruction signal of the fuel cell system or an online polarization curve load instruction signal of the fuel cell system is received; wherein the online polarization curve load instruction signal of the fuel cell system has a higher priority than the online activation instruction signal of the fuel cell system; Whether to enter the online activation mode of the fuel cell system or the online polarization curve load mode of the fuel cell system is determined in combination with self-control means; According to the entered corresponding mode, a corresponding current request is made to the fuel cell system.

[0033] The steps and methods involved in Embodiments 2 to 3 above correspond to Embodiment 1, and the specific implementation can refer to the relevant description part of Embodiment 1.

[0034] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for online activation and polarization curve load control of a fuel cell system, characterized in that, include: When the vehicle is powered on, the low-voltage components are activated, and the vehicle controller receives either the fuel cell system online activation command signal or the fuel cell system polarization curve online load command signal; among them, the fuel cell system polarization curve online load command signal has higher priority than the fuel cell system online activation command signal. The vehicle controller, based on its own control methods, determines whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode. The vehicle controller makes corresponding current requests to the fuel cell system based on the entered mode.

2. The method for online activation and polarization curve load control of a fuel cell system as described in claim 1, characterized in that, The online activation command signal for the fuel cell system is as follows: receiving a signal that the snow mode switch on the instrument panel has been pressed and returned a first set number of times within a first set time period, and timing the set delay time.

3. The method for online activation and polarization curve load control of a fuel cell system as described in claim 2, characterized in that, The polarization curve load command signal for the fuel cell system is specifically: receiving a signal within a second set time period of repeatedly pressing and returning the instrument snow mode switch a second set number of times.

4. The method for online activation and polarization curve load control of a fuel cell system as described in claim 3, characterized in that, The sum of the first set time and the set delay time is greater than the second set time.

5. The method for online activation and polarization curve load control of a fuel cell system as described in claim 1, characterized in that, The vehicle controller determines whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online load mode based on its own control methods. Specifically, when the vehicle receives the fuel cell system polarization curve load command or online activation command, if the driver intends to start the fuel cell system and the vehicle controller sends a start command to the fuel cell system, the vehicle controller enters the fuel cell system online activation mode or the fuel cell system polarization curve load mode according to the received command.

6. The method for online activation and polarization curve load control of a fuel cell system as described in claim 1, characterized in that, The online activation mode and online loading mode of the fuel cell system polarization curve are both fuel cell current request modes.

7. The method for online activation and polarization curve load control of a fuel cell system as described in claim 1, characterized in that, After entering the fuel cell system online activation mode, the vehicle controller activates the fuel cell system online through the current request mode. The minimum current is the fuel cell system idle current, and the maximum current is the fuel cell system rated current. Activation starts from the minimum current, and the current activation growth gradient is m amperes. When the fuel cell cell voltage exceeds p volts and is maintained for more than y minutes at the current activation current, the next current activation cycle begins. After activation is completed, the vehicle controller requests power from the fuel cell system through the power request mode based on the power battery SOC.

8. The method for online activation and polarization curve load control of a fuel cell system as described in claim 1, characterized in that, After entering the fuel cell system polarization curve load mode, the vehicle controller requests the fuel cell system current. The minimum current is the fuel cell system idle current, and the maximum current is the fuel cell system rated current. Polarization load is started from the minimum current, and the current load increase gradient is n amperes. The load time at each current point is x minutes. After the load is completed, the vehicle controller enters the power request mode based on the power battery SOC to request power from the fuel cell system.

9. An online activation and polarization curve load control system for a fuel cell system, characterized in that, Includes a vehicle controller, which is configured to: When the vehicle is powered on, the low-voltage components are activated and receive either the fuel cell system online activation command signal or the fuel cell system polarization curve online load command signal; among them, the fuel cell system polarization curve online load command signal has higher priority than the fuel cell system online activation command signal. Based on its own control methods, it determines whether to enter the fuel cell system online activation mode or the fuel cell system polarization curve online loading mode; The appropriate current request is made to the fuel cell system based on the selected mode.

10. A fuel cell bus, characterized in that, The fuel cell system online activation and polarization curve load control system as described in claim 9 is adopted.

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