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Hydrogen-fuelled internal combustion engines with near zero emissions and efficiencies exceeding today's port-fuel-injected engines are a potential near term option and a bridge to hydrogen fuel cell vehicles where fuel cell undergoes developments to make it economically viable. Hydrogen with its inherent high flame velocity enables a more isochoric, thus thermodynamically more favorable combustion than conventional diesel engines which undergo a pressure and temperature rise spread over several degrees of crank travel. Hydrogen has an exceptionally wide flammability limits compared to conventional fuels enabling the engine to work with very lean mixtures, thus omitting the necessity of a throttle valve~this ideally suits a diesel engine operation. Its high autoignition temperature helps to realize the working cycles at higher compression ratios and consequent higher brake thermal efficiencies.