Detection system and detection method for hydrogen leakage of fuel cell vehicle

Abstract

The invention provides a detection system and detection method for hydrogen leakage of a fuel cell vehicle. The method comprises the steps that: the relative position of a leakage source is determined through a signal incident angle of an acoustic vector sensor and a numerical value of a trigonometric function of the signal incident angle if the hydrogen concentration in a detection system reaches a threshold value before starting, and the relative position is converted into a distance to a reference plane through coordinates, the hydrogen leakage rate is estimated through a neural network based on error back propagation,the leakage degree is judged; and if the hydrogen concentration does not reach the threshold value, whether a hydrogen supply pipeline leaks or not is judged by comparing the integral of the pressure of the hydrogen supply pipeline to the time with the threshold value, and whether a fuel cell stack and a hydrogen circulation pipeline leak or not is determined through the hydrogen reaction and the proportion of the sum of a remaining amount to a supply amount. The position of the hydrogen leakage source can be judged and displayed, and meanwhile the leakage rate of the leakage source at a hydrogen storage bottle can be estimated.

Description

technical field [0001] The invention relates to the technical field of hydrogen leakage monitoring, in particular to a detection system and detection method for hydrogen leakage of fuel cell vehicles. Background technique [0002] Fuel cell vehicles use hydrogen as the main fuel, and generate electricity through the electrochemical reaction of hydrogen and oxygen to drive vehicles. Compared with traditional internal combustion engines, fuel cell emissions are only water and will not pollute the environment, so they have broad development prospects. As the main fuel of fuel cell vehicles, hydrogen is stored in pressure vessels at high pressure, which has strong leakage and diffusivity, and hydrogen is flammable and explosive, and a little carelessness will cause hydrogen to burn or explode , causing serious safety accidents. Today, the safety of hydrogen has become one of the important bottlenecks in the promotion of fuel cell vehicles, and it is a problem that countries aro...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (CN112092627A) discloses a hydrogen leakage detection system for vehicles. By detecting the pressure difference in the hydrogen pipeline, it replaces the method of detecting the hydrogen concentration in the traditional solution to determine the hydrogen leakage, and starts the fuel cell after the detection is safe; The invention is mainly aimed at the detection of hydrogen leakage before starting, and does not involve the detection of hydrogen leakage during driving or after parking

However, the above detection methods can only roughly determine the location and degree of leakage of hydrogen gas, and the location accuracy is low

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