Compared with normal control,three characteristics of regenerative combustion control are emphatically introduced,i e smoke temperature measurement,automatic changeover control and smoke-air flow ratio control.

The Air-fuel ratio control system is the important composing part to pledge its fuel economy, low emission and good driveability.

Considering the air fuel ratio characteristics of gasoline engine which is difficulty to accurately control under transient condition,a neural network composite air fuel ratio control strategy was advocated in this paper.

Accurate air fuel ratio control is the key element for fuel economy, low emissions and good driveability of spark ignition(SI) engine.

The new approach achieved inverter switch s duty ratio control and made torque ripple minimum.

Simulation and experimental results show that the new DTC strategy based on duty ratio control has advantages of traditional DTC and effectively reduces torque ripples which improve the performance of traditional DTC.

A novel DTC strategy of PMSM combined sectors subdivision with duty ratio control is proposed based on the analysis of flux linkage and torque control trajectory and ripples.