Test bench for automatic control strategy hydrogen fuel air path

Abstract

The utility model relates to the field of fuel cells, in particular to a test bench for an automatic control strategy hydrogen fuel air path. The system comprises a test branch, and an air filter, a manual switch valve, a standard air flow meter, an air compressor, an intercooler and an electromagnetic switch valve which are sequentially communicated through a pipeline, and the test branch is provided with a cut-off flange a, a system air flow meter and a cut-off flange b which are sequentially communicated. The input end of the test branch is communicated with a pipeline between the air filter and the manual switch valve, and the output end of the test branch is communicated with a pipeline between the manual switch valve and the standard air flow meter; sensor assemblies are arranged on a pipeline between the standard air flow meter and the air compressor, a pipeline between the air compressor and the intercooler and a pipeline between the intercooler and the electromagnetic switch valve. According to the utility model, the system air flow meter can be calibrated, and the operation of the test bench can be automatically controlled by using the system air flow meter according to an automatic control strategy after calibration.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, in particular to a test bench for an automatic control strategy hydrogen fuel air path. Background Art

[0002] The fuel cell system consists of a fuel cell stack and corresponding auxiliary equipment (BOP, Balance Of Plant). Under the control of the fuel cell control unit, the normal operation of the fuel cell is achieved. The fuel cell stack is the core of the fuel cell system, and the BOP maintains the continuous, stable and safe operation of the stack. The durability of the fuel cell is the key to the problem of fuel cell vehicles, and a large part of the durability lies in the problem of the control system. The key factors affecting the life of the fuel cell are: dynamic conditions, starting, continuous idling, etc. These factors are ultimately determined by the system control. This makes it necessary to develop a fuel cell system BOP test bench to perform performance tests on the subsystems carried by the system. The BOP test bench will include an air subsystem, a hydrogen subsystem, and a cooling subsystem. The subsystem components verified by the test bench are applied to the fuel cell system, which can determine the output performance and operating adaptability of the fuel cell engine, and provide strong experimental data support for the stable operation of the system.

[0003] At present, the air subsystem of the BOP test bench in the fuel cell industry cannot generally achieve complete automatic control because the standard flow meter it carries has a slow response problem. It needs to input the working conditions by itself, and the communication method is not the CAN network communication commonly used in fuel cell systems. There is no function to calibrate the system air flow meter, which brings certain difficulties to the testing of BOP components. Utility Model Content

[0004] The utility model aims to solve the problems existing in the background technology and proposes a test bench for hydrogen fuel air circuit which can calibrate the system air flow meter and use the system air flow meter to automatically control the operation of the test bench according to the automatic control strategy after calibration.

[0005] The technical solution of the utility model is a test bench for an automatic control strategy hydrogen fuel air circuit, comprising a test branch and an air filter, a manual switch valve, a standard air flow meter, an air compressor, an intercooler and an electromagnetic switch valve which are sequentially connected through pipelines; a cut-off flange a, a system air flow meter and a cut-off flange b which are sequentially connected are arranged on the test branch; an input end of the test branch is connected to the pipeline between the air filter and the manual switch valve, and an output end of the test branch is connected to the pipeline between the manual switch valve and the standard air flow meter; sensor components are arranged on the pipeline between the standard air flow meter and the air compressor, on the pipeline between the air compressor and the intercooler, and on the pipeline between the intercooler and the electromagnetic switch valve.

[0006] Preferably, the system air flow meter has a mounting tool, and the cut-off flange a and the cut-off flange b are respectively connected to two ends of the mounting tool.

[0007] Preferably, the system air flow meter feeds back the current air flow to the host computer in real time.

[0008] Preferably, the sensor assembly comprises a pressure sensor and a temperature sensor.

[0009] Preferably, the test bench is communicatively connected to the controller of the air compressor via CAN communication.

[0010] Compared with the prior art, the utility model has the following beneficial technical effects:

[0011] The utility model supports CAN communication with the air compressor controller, and can calibrate the system air flow meter with a high-precision standard air flow meter, which greatly saves the cost of outsourcing the calibration of the air flow meter. After calibration, the system air flow meter is used to automatically control the operation of the test bench according to the automatic control strategy, with a high degree of automation. The system air flow meter has a fast response speed, can feedback the current air flow to the host computer in real time, and automatically runs for a long time according to the set test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the connection structure of an embodiment of the utility model.

[0013] Figure markings: 1. air filter; 2. manual switch valve; 3. cut-off flange a; 4. system air flow meter; 5. cut-off flange b; 6. standard air flow meter; 7. pressure sensor a; 8. temperature sensor a; 9. air compressor; 10. pressure sensor b; 11. temperature sensor b; 12. intercooler; 13. pressure sensor c; 14. temperature sensor c; 15. solenoid switch valve. DETAILED DESCRIPTION

[0014] Embodiment 1

[0015] like Figure 1As shown, the test bench of the hydrogen fuel air circuit of an automatic control strategy proposed in this embodiment includes a test branch and an air filter 1, a manual switch valve 2, a standard air flow meter 6, an air compressor 9, an intercooler 12 and an electromagnetic switch valve 15 connected in sequence through a pipeline. The standard air flow meter 6 adopts a high-precision standard thermal air flow meter such as Alicat. The front end pressure of the air compressor 9 is controlled by adjusting the electromagnetic switch valve 15, and the electromagnetic switch valve 15 is connected to the tail exhaust. After the air is cooled by the intercooler 12, it is discharged into the atmosphere through the tail exhaust. The test branch is provided with a cut-off flange a3, a system air flow meter 4 and a cut-off flange b5 which are connected in sequence. The input end of the test branch is connected to the pipeline between the air filter 1 and the manual switch valve 2, and the output end of the test branch is connected to the pipeline between the manual switch valve 2 and the standard air flow meter 6; sensor components are provided on the pipeline between the standard air flow meter 6 and the air compressor 9, on the pipeline between the air compressor 9 and the intercooler 12, and on the pipeline between the intercooler 12 and the electromagnetic switch valve 15, and the sensor components detect relevant parameters at different positions.

[0016] The system air flow meter 4 has a mounting tool, and the cut-off flange a3 and the cut-off flange b5 are respectively connected to the two ends of the mounting tool. The system air flow meter 4 feeds back the current air flow to the host computer in real time.

[0017] The test bench is connected to the controller of the air compressor 9 via CAN communication and has a DBC one-key import function. CAN communication is compatible with the CAN network communication commonly used in fuel cell systems, while most existing BOP test benches use industrial Ethernet PLC communication, which is not compatible with the CAN network communication commonly used in fuel cell systems.

[0018] This embodiment can calibrate the system air flow meter 4 with a high-precision standard air flow meter 6, and after calibration, use the system air flow meter 4 to automatically control the operation of the test bench according to the automatic control strategy. After the air is processed by the air filter 1, the branch into which the air enters is controlled by the manual switch valve 2; when the manual switch valve 2 is opened and the cut-off flange a3 and the cut-off flange b5 are not connected, the air enters the straight passage, and at this time, it will not pass through the test branch where the system air flow meter 4 is located. The standard air flow meter 6 supports the manual input of general test conditions. The air becomes high-temperature gas after being pressurized by the air compressor 9. The intercooler 12 can cool the high-temperature gas.

[0019] When the manual switch valve 2 is closed, the cut-off flange a3, the system air flow meter 4 and the cut-off flange b5 are connected, the air enters the test branch where the system air flow meter 4 is located. After the standard air flow meter 6 stabilizes for a certain period of time, the system air flow meter 4 is calibrated by the flow value fed back by it, which greatly saves the cost of outsourcing the calibration of the air flow meter. After the system air flow meter 4 is calibrated, its fast response speed is used to import the upper computer according to the loaded working conditions, and the general characteristics and durability tests of the air compressor 9 are automatically performed, with a high degree of automation. The system air flow meter 4 of the fuel cell can feed back the current air flow to the upper computer in real time, and automatically run for a long time according to the set test process.

[0020] Embodiment 2

[0021] like Figure 1 As shown, this embodiment proposes a test bench for an automatic control strategy for the hydrogen fuel air circuit. Compared with the first embodiment, in this embodiment, the sensor component on the pipeline between the standard air flow meter 6 and the air compressor 9 includes a pressure sensor a7 and a temperature sensor a8. The pressure sensor a7 provides real-time feedback of the front-end pressure of the air compressor 9, and the temperature sensor a8 provides real-time feedback of the front-end temperature of the air compressor 9.

[0022] The sensor assembly on the pipeline between the air compressor 9 and the intercooler 12 includes a pressure sensor b10 and a temperature sensor b11. The pressure sensor b10 feeds back the pressure at the front end of the intercooler 12 in real time, and the temperature sensor b11 feeds back the temperature at the front end of the intercooler 12 in real time.

[0023] The sensor assembly on the pipeline between the intercooler 12 and the electromagnetic switch valve 15 includes a pressure sensor c13 and a temperature sensor c14. The pressure sensor c13 feeds back the pressure at the rear end of the intercooler 12 in real time, and the temperature sensor c14 feeds back the temperature at the rear end of the intercooler 12 in real time.

[0024] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A test bench for an automatic control strategy hydrogen fuel air circuit, characterized in that: The invention comprises a test branch and an air filter (1), a manual switch valve (2), a standard air flow meter (6), an air compressor (9), an intercooler (12) and an electromagnetic switch valve (15) which are sequentially connected through a pipeline. The test branch is provided with a cut-off flange a (3), a system air flow meter (4) and a cut-off flange b (5) which are sequentially connected. The input end of the test branch is connected to the pipeline between the air filter (1) and the manual switch valve (2), and the output end of the test branch is connected to the pipeline between the manual switch valve (2) and the standard air flow meter (6). Sensor components are provided on the pipeline between the standard air flow meter (6) and the air compressor (9), on the pipeline between the air compressor (9) and the intercooler (12), and on the pipeline between the intercooler (12) and the electromagnetic switch valve (15).

2. The test bench for the automatic control strategy hydrogen fuel air circuit according to claim 1 is characterized in that: The system air flow meter (4) has an installation tool, and a cut-off flange a (3) and a cut-off flange b (5) are respectively connected to two ends of the installation tool.

3. The test bench for the automatic control strategy hydrogen fuel air circuit according to claim 1, characterized in that: The system air flow meter (4) feeds back the current air flow to the host computer in real time.

4. The test bench for the automatic control strategy hydrogen fuel air circuit according to claim 1, characterized in that: The sensor assembly includes a pressure sensor and a temperature sensor.

5. The test bench for the automatic control strategy hydrogen fuel air circuit according to claim 1, characterized in that: The test bench is connected to the controller of the air compressor (9) via CAN communication.

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