天然气做为汽车燃料，在世界范围内已有几十年的历史。20世纪30年代，富气贫油的意大利率先采用天然气作为汽车燃料。随着天然气资源的开发与各国对汽车尾气排放法规的日益严格化，天然气汽车在许多国家得到广泛的推广应用。据统计，目前全世界约有570多万辆天然气汽车，已建天 Natural gas as a motor fuel has been around the world for decades. In the 1930s, rich and lean Italy pioneered the use of natural gas as motor fuel. With the development of natural gas resources and the increasingly stringent regulations on automobile exhaust emissions in various countries, natural gas vehicles have been widely popularized and applied in many countries. According to statistics, there are currently about 5.7 million natural gas vehicles in the world and have been built