进气模型对汽油机瞬态空燃比控制的应用

Application of Intake Model to Transient Air Fuel Ratio Control of Gasoline Engine

应用进气模型的目的是精确计算进气循环进入气缸的空气量。文章简要介绍发动机进气模型中主充气模型、次充气模型的原理和算法,以及在瞬态工况下的进气压力预测算法。实际证明,根据预测压力计算出的预测进气量与发动机的实际进气量非常接近,可以把汽油机在瞬态工况下的开环空燃比控制在理论空燃比附近,确保三元催化器拥有较高的转化效率,从而达到高效降低汽油机排气污染物排放的目的。

The purpose of the application of intake model is to accurately calculate the volume of air entering the cylinder during the intake cycle.This paper briefly introduces the principle and algorithm of the primary and secondary intake models in the engine intake model,as well as the intake pressure prediction algorithm under transient conditions.The predicted air intake volume calculated according to the predicted pressure is very close to the actual intake volume of the engine.The open-loop air-fuel ratio of gasoline engine under transient conditions can be controlled near the theoretical air-fuel ratio to ensure that the three-way catalytic converter has a high conversion efficiency,so as to achieve the purpose of effectively reducing exhaust emissions of gasoline engine.