关键词: CNG 发动机；动力性能；轻型客车；AVL Cruise

Abstract: Although the natural gas vehicle has good emission and economy, it also has the defect of insufficient power, which affects the market promotion and application of the vehicle. In order to solve the problem of insufficient power of compressed natural gas (CNG) bus, on the basis of not changing the original engine structure, firstly, by adjusting the engine jet pressure and ignition advance angle, the engine power and torque loss are reduced as much as possible. Then, the engine is mounted on a light passenger model, and the gas system is arranged through reasonable design. Finally, the vehicle simulation software AVL Cruise is used to establish a dynamic simulation model to match the optimal combination of transmission and rear axle speed ratio. After the actual road test verification, the power of CNG vehicle can reach more than 90% of similar gasoline engine models, which can meet the actual use needs of users.

Key words: CNG engine; power performance; light passenger; AVL Cruise