In order to achieve efficient and clean combustion,the influence of variable intake valve strategy(VIV),variable exhaust valve strategy(VEV)and variable intake valve combine exhaust valve strategy(VICE)on the un-throttle engine performance was studied based on a self-developed variable valve lift actuation.The results show that,compared with the original engine,the three valve control strategies all can effectively improve brake specific fuel consumption(BSFC)and indicated thermal efficiency(ITE).The VICE strategy showed the most optimal results,for example,BSFC and ITE were optimized by up to 28％and 6％compared to the original engine.Both VIV strategy and VICE strategy can reduce pumping loss,especially for VIV strategy,which can reduce pumping loss up to 36％compared with the original engine.All three strategies can reduce NOx emissions,among which VEV strategy performed best.Different valve strategies showed few effects on THC emissions when NMEP exceeded 0.3 MPa.
关键词
内燃机/可变进排气门/气门控制策略/无节气门发动机/泵气损失/有效燃油消耗率/NOx排放
Key words
internal combustion engine/variable intake and exhaust valves/valve control strategy/un-throttle engine/pumping loss/brake specific fuel consumption/NOx emissions
维普
万方数据