Hydrogen leakage detection control method and system for hydrogen fuel cell vehicle

Abstract

The invention discloses a hydrogen leakage detection control method and system for a hydrogen fuel cell vehicle. The detection control method comprises a starting process control method, a driving process control method and a parking state control method. A direct starting mode and a segmented starting mode in the starting process control method both detect the hydrogen leakage concentration HC, when the hydrogen leakage concentration HC is larger than the safety limit concentration H1, the IGN contactor is disconnected, and the whole vehicle fails to be started. The hydrogen leakage concentration HC is detected in real time in the driving process, all hydrogen cylinder valves are closed when the hydrogen leakage concentration HC is larger than the safety limit concentration H1, the fuel cell is shut down, and the whole vehicle is automatically switched into a pure electric mode. In the parking process, the hydrogen leakage concentration HC can be detected regularly, and data are uploaded to the TBOX when the hydrogen leakage concentration HC is larger than the safety limit concentration H1. Hydrogen leakage detection control strategies are provided in the starting, driving and parking processes of the hydrogen fuel automobile, it is guaranteed that the hydrogen concentration of the automobile is in a safe state, and safety accidents caused by too high hydrogen concentration are avoided.

Description

technical field [0001] The invention relates to a hydrogen fuel cell vehicle leakage detection control, in particular to a hydrogen fuel cell vehicle hydrogen leakage detection control method and system thereof. Background technique [0002] As the whole world vigorously advocates the development of hydrogen energy strategy, a wave of hydrogen fuel cell vehicles has been set off at home and abroad, and a large number of hydrogen fuel cell vehicles have been gradually developed and launched on the market. [0003] At present, there are many dew points in the hydrogen of 70MPa fuel cell vehicles from the hydrogen refueling port to the hydrogen storage bottle, from the hydrogen storage bottle to the stack, including leakage between the hydrogen storage bottle and the bottle valve, between the valve and the valve, and the pipe interface. Risk, and the current hydrogen storage system is rigidly connected, in the harsh road environment, deformation occurs, aggravating the possibil...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many dew points in the hydrogen of 70MPa fuel cell vehicles from the hydrogen refueling port to the hydrogen storage bottle, from the hydrogen storage bottle to the stack, including leakage between the hydrogen storage bottle and the bottle valve, between the valve and the valve, and the pipe interface. Risk, and the current hydrogen storage system is rigidly connected, in the harsh road environment, deformation occurs, increasing the possibility of leakage

At present, the focus of hydrogen leakage detection is the detection of the concentration value during driving, but there is a lack of corresponding safety measures during the start and stop periods. Even if the concentration value is detected to be too high and the shutdown process is performed, the location of the high concentration cannot be directly determined

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