Investigation of high compression lean burn engine

Sequential fuel injection, in which fuel is injected into a swirl being generated for mixture stratification, was used to pursue the potential of a lean burn engine to improve its performance. As a result, it has been found that the most effective method of increasing thermal efficiency while reducing nox emission level is to combine a high compression compact combustion chamber located on the exhaust valve side of the cylinder head with dics (dual induction control system). This method was used to build a high compression lean burn experimental vehicle, which was evaluated for compliance to various emission standards. Testing showed that the proposed vehicle can improve fuel economy by 10.5 Per cent on the japanese 10 mode cycle, by 8.3 Per cent on the ece mode cycle, and by 6.3 Per cent on the us epa test mode cycle while meeting these emission standards (a).