Hydrogen as an Automobile Fuel

For the energy source of automobiles, more than 30 years ahead, fuel cell or hydrogen will be of greatest promise. In respect of transportability, liquid hydrogen is more advantageous. For good thermal efficiency, low NOx emission and suppression of abnormal combustion, the maximum output power of hydrogen fueled engine should be increased as much as possible and then, in the most past of practical operation, the engine should be operated in lean mixture. For this purpose, there are two methods; one is cooling intake air by liquid hydrogen, the other is hydrogen fuel injection during compression stroke, which also has to use liquid hydrogen to minimize the compression work.And this paper also describes in detail the characteristics of hydrogen gas, liquid hydrogen and metal hydride for an automobile fuel, and a phenomenon and some control methods of backfire.