CNG Direct Injection Engine Control Based on Rapid Control Prototype Technique

To improve the performance of compressed natural gas(CNG) engines,CNG in-cylinder direct injection was implemented with a rapid control prototype(RCP) technique.According to application requirements,the flow characteristics of the direct injector was tested,a gas supply system for the CNG direct injection engine was designed,and the control strategy for the CNG in-cylinder direct injection was made.The experiment results show that the output torque of the CNG in-cylinder direct injection engine could reach the output level of a gasoline engine of the same kind.At the rotational speed of 2 500 r/min,the power loss of the CNG in-cylinder direct injection engine compared with the gasoline engine was only 0.006%.