单进气VVT汽油机性能优化分析仿真研究

Optimization Simulation Study of Gasoline Engine Performance with Intake VVT

在概念设计阶段,应用GT-power和optimus软件联合对一款1.6L排量的汽油机进行热力学仿真计算,通过合理设计进、排气凸轮升程高度及包角、进气歧管长度和排气凸轮安装相位,进行了多参数与多目标任务分析。通过优化快速确定最佳性能的参数值,同时通过优化不同设计转速下的进气气门配气正时,使发动机整个转速范围内性能都得到最优。为制定性能开发指标提供支撑,为下一阶段热力学开发试验提供理论依据,减少试验的工作量和试验费用。

In the concept confirmation phase, the performance of 1.6L engine was evaluated by means of thermodynamic simulation using the GT-power and Optimus software. The multi_objective analysis with regard to torque targets was done at different engine speed about full load with four parameters, the tube length of intake manifold, intake cam profile, exhaust cam profile, exhaust cam installation timing. At the same time the valve timing of intake VVT was calculated by optimizer tool. The best performances were obtained fast, which gave the base of the development target and gave the theoretic function for the next work of performance development test and mechanical development test. Multi_objective optimization software used for engine development is fast and cost saving.