Through the adjustment of valve timing,wide HCCI operation region with engine speed from 880 r/min to 4 000 r/min and p_(IMEP) from 0.25 MPa to 0.75 MPa can be obtained without intake charge heating.

• 通过调整气门定时；在不需要进气加热的条件下；可在转速880~4 000 r/min；负荷0.；25~0