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Vehicle-mounted fuel cell system and starting operation control method thereof

A fuel cell system and fuel cell technology, applied in the direction of fuel cell control, fuel cells, fuel cell additives, etc., to achieve the effect of enhancing environmental adaptability and reliability

Pending Publication Date: 2022-03-15
BEIJING SINOHYTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention aims to provide a vehicle-mounted fuel cell system and its start-up operation control method to solve the problem that the prior art does not have a wide range of boost ratios between the fuel cell and the DC-DC converter during switching from cold start to normal operation The problem with internal coordination control methods

Method used

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  • Vehicle-mounted fuel cell system and starting operation control method thereof
  • Vehicle-mounted fuel cell system and starting operation control method thereof
  • Vehicle-mounted fuel cell system and starting operation control method thereof

Examples

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Embodiment 1

[0069] An embodiment of the present invention, such as figure 1 As shown, a vehicle-mounted fuel cell system is disclosed, including a stack, a DC-DC converter, a hydrogen device, an air device and a controller.

[0070] Wherein, the hydrogen gas inlet of the stack is connected to the output end of the hydrogen equipment, the air inlet is connected to the output end of the air equipment, and the power supply end is connected to the DC-DC converter.

[0071] Optionally, wired or wireless data transmission can be used for control between the controller and the DC-DC converter, hydrogen equipment, and air equipment.

[0072] The controller is used to control the DC-DC converter to a lower switching frequency when starting at low temperature, start the air equipment and hydrogen equipment, adjust the metering ratio of air into the stack and the power supply current of the stack, so that the stack outputs the target voltage, Complete low-temperature startup; when switching from l...

Embodiment 2

[0076] Optimizing on the basis of Example 1, the vehicle-mounted fuel cell system also includes a three-way pipe, hydrogen circulation equipment, such as Figure 2~3 shown. Preferably, the hydrogen circulation equipment can adopt an existing hydrogen circulation pump.

[0077] Among them, the hydrogen gas inlet of the cell stack is connected to the output end of the hydrogen gas equipment through the input end one of the three-way pipe, connected to the output end of the hydrogen gas circulation equipment through the input end two of the three-way pipe, and the exhaust port is connected to the hydrogen gas circulation equipment. input connection.

[0078] Preferably, the vehicle fuel cell system further includes two pressure regulating valves.

[0079] Wherein, the input end of each pressure regulating valve is connected with the corresponding hydrogen intake pipe or air intake pipe in the cell stack, and its control end is connected with the output end of the controller.

...

Embodiment 3

[0119] Another embodiment of the present invention discloses a start-up operation control method of the vehicle-mounted fuel cell system described in Embodiments 1 and 2, including the following steps:

[0120] SS1. When starting at low temperature, first control the DC-DC converter to a lower switching frequency, then start the air equipment and hydrogen equipment, adjust the metering ratio of air into the stack and the power supply current of the stack, so that the stack outputs the target voltage, and the completion Low temperature start;

[0121] SS2. When switching from low-temperature start-up to high-temperature operation, first control the output current of the stack to reduce to the calibrated value, and then adjust the metering ratio of the air into the stack to the target metering ratio;

[0122] SS3. When running at high temperature, control the DC-DC converter to a higher switching frequency, and adjust the fuel cell parameters in real time according to the real-t...

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Abstract

The invention provides a vehicle-mounted fuel cell system and a start operation control method thereof, belongs to the technical field of fuel cells, and solves the problem that a coordination control method for a fuel cell and a DC-DC converter within a wide step-up ratio range in the process of switching from cold start to normal operation does not exist in the prior art. The system comprises a galvanic pile, a DC-DC converter, hydrogen equipment, air equipment and a controller. The hydrogen inlet of the electric pile is connected with the output end of the hydrogen equipment, the air inlet is connected with the output end of the air equipment, and the power supply end is connected with the DC-DC converter. And during low-temperature starting, the controller controls the DC-DC converter to be in a low switching frequency, the air equipment and the hydrogen equipment are started, and the stoichiometric ratio and the current of air entering the pile are adjusted, so that the pile outputs target voltage. And in the switching process, after the controller controls the output current of the electric pile to be reduced to a calibration value, the in-pile air stoichiometric ratio is adjusted to a target stoichiometric ratio. And during high-temperature operation, the controller controls the DC-DC converter to convert high switching frequency, and then the parameters of the fuel cell are adjusted in real time.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a vehicle-mounted fuel cell system and a start-up operation control method thereof. Background technique [0002] Hydrogen fuel cell vehicles are new energy vehicles with broad development prospects, which have many advantages such as short hydrogenation time and long driving range. Vehicle-mounted fuel cell systems usually include electric stacks and peripheral hydrogen, air, cooling and other components. Electric stacks further include proton exchange membranes, catalyst layers, gas diffusion layers, bipolar plates, etc. Since the theoretical voltage of a single monolithic battery is 1.23 V, which usually achieves high power output by connecting hundreds of pieces in parallel. [0003] Usually, during the cold start of the fuel cell system, a lower air metering ratio is used to reduce the output voltage of the fuel cell system to speed up the start-up rate. Therefore, duri...

Claims

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Application Information

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IPC IPC(8): H01M8/04298H01M8/04089H01M8/04H01M8/04858
CPCH01M8/04298H01M8/04895H01M8/04865H01M8/04925H01M8/04089H01M8/04Y02E60/50
Inventor 赵兴旺闫延风王鹏李飞强高云庆
Owner BEIJING SINOHYTEC
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