Abstract
Hydrogen leakage and emission will bring adverse effects to the environment and human health. When it enters a certain concentration range, it will bring the potential explosion. Hydrogen emissions from fuel cell vehicles can be divided into two sources: normal operation of the system and leakage under abnormal circumstances. This paper mainly uses the flowmeter method to measure the hydrogen emission from fuel cell electric vehicle（FCEV）. The different emission characteristics of different types of FCEV under idle and steady cycle conditions were analyzed. The hydrogen emission levels of different types of FCEV under idle and cycle conditions were verified by analyzing and processing the experimental data through a certain amount of hydrogen emission tests of FCEV.
Highlights
Since hydrogen enters 4% - 75% in air and reaches 4% 94% in oxygen, it has reached its explosion range[1]
Hydrogen emissions from FCEV can be divided into normal operation of the system and leakage under abnormal conditions
The normal hydrogen emission depends on the operating principle, system composition, manufacturing process level, design level, control strategy of the control software and other combined factors of the fuel cell system[2]
Summary
Since hydrogen enters 4% - 75% in air and reaches 4% 94% in oxygen, it has reached its explosion range[1]. In the case of air circulation, it is easier to gather the concentration in the local area to reach the above two kinds of range, resulting in the potential explosion. Hydrogen emissions from FCEV can be divided into normal operation of the system and leakage under abnormal conditions. The normal hydrogen emission depends on the operating principle, system composition, manufacturing process level, design level, control strategy of the control software and other combined factors of the fuel cell system[2]. ˄2˅Abnormal hydrogen emissions As with other gas-fueled vehicles, leaks are possible as long as there are connecting parts and pressure differences. The leakage under abnormal conditions is mainly manifested in the surface penetration of highpressure gas cylinders and pipelines. Abnormal leakage is usually continuous, after a long time of shutdown, can reach a high concentration, forming a hidden danger. The cause and start time of the abnormal leak are incidental and difficult to detect
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