发动机电液全可变配气系统建模与同步仿真

Modeling and synchronous simulation of the engine's electro-hydraulic full variable valve system

为了研究全可变配气系统对柴油机性能的影响,基于CY4102BG柴油机,借助GT-power建立柴油机整机与全可变配气系统的同步仿真模型,利用优化得到的气阀运动最佳配气参数,完成电液全可变配气柴油机的性能同步仿真。仿真实验结果表明:在中低转速工况下,柴油机有效功率的增幅为0.33%~5.65%,有效油耗率的降幅为0.33%~5.35%;在高转速工况下,柴油机的性能改善不明显。

Fully variable electro-hydraulic valve technology can realize the flexible regulation of valve parameters , im-prove the performance of diesel engine, and thus overcome the limitations of traditional mechanical cam mechanisms. By using a CY4102BG diesel engine and GT-power, we established a synchronous simulation model on the complete diesel engine and the full variable valve system. These steps were carried out to study the effect of a fully variable gas distribution system on diesel engine performance. Furthermore, by using the optimum gas distribution parameters on valve motion, which were attained via optimization, we achieved the synchronous simulation on the performances of the electro-hydraulic full variable distribution diesel engine. The simulation results indicate that, under the low-speed conditions, the effective power of a diesel engine can be improved by 0. 33% -5. 65% and that fuel consumption rate can be reduced by 0？ 33% -5. 35%. However, the improvement is not significant under high-speed conditions.