汽车工程

汽车工程 ›› 2018, Vol. 40 ›› Issue (9): 1021-1031.doi: 10.19562/j.chinasae.qcgc.2018.09.004

• • 上一篇    下一篇

CVVL发动机动态工况优化控制

韩本忠1,张力华2,傅园松2,李理光1   

  1. 1.同济大学汽车学院,上海 201804;
    2.联合汽车电子有限公司,上海 201206
  • 收稿日期:2018-07-19 出版日期:2018-09-25 发布日期:2018-09-25
  • 通讯作者: 韩本忠,高级工程师,博士研究生,E-mail:benzhong.han@UAES.com

Optimization of Dynamic Operations for Engine with CVVL System

Han Benzhong1, Zhang Lihua2, Fu Yuansong2 & Li Liguang1   

  1. 1.College of Automotive Studies, Tongji University, Shanghai 201804;
    2.United Automotive Electronic Systems Co., Ltd., Shanghai 201206
  • Received:2018-07-19 Online:2018-09-25 Published:2018-09-25

PDF (PC)

460

赞

摘要： 为解决CVVL发动机在搭载车辆后出现的加速抖动甚至熄火和减速转速上冲问题,对发动机的动态工况控制和优化方法进行了研究。发动机测试结果表明,造成上述问题的根本原因是CVVL、节气门和可变气门正时(variable valve timing, VVT)三者不同的动态控制特性,发动机进气动态特性是各个进气控制机构控制效果的动态叠加。加油门时,CVVL动态响应速度快,而VVT切换动作延迟,进气量突然上冲,然后下降,产生进气波动,从而造成发动机转速抖动。减油门时,当CVVL动作比VVT动作慢,在VVT切换时,进气量首先上升,然后随CVVL升程下降而下降,造成发动机转速抖动,但减油门时问题一般没有加油门时明显。通过引入CVVL和VVT响应速度滤波时间,并采用CVVL,VVT和节气门开度协同控制,优化CVVL和VVT在加油门和减油门时控制效果,上述问题得到了有效解决,实现了发动机动态工况平顺、快速的切换。

关键词: 发动机, CVVL系统, 动态工况, 优化控制

Abstract: Dynamic control and optimization for the engine with the CVVL system is studied in this paper to solve the problem of acceleration jerk, even engine stall and deceleration speed overshoot after the engine with CVVL is equipped on the vehicle. Engine tests reveal that the root cause of acceleration jerk and deceleration speed overshoot is the different dynamic control behaviors of CVVL system, throttle valve and variable valve timing (VVT) while intake air mass flow of the engine is the dynamic superposition result of the 3 control mechanism. During acceleration, CVVL responses quickly while VVT shows response delay. As a result, the intake air mass flow rises suddenly first and then drops, leading to intake fluctuation and engine jerk. During deceleration, CVVL acts slower than VVT. Intake air mass flow rises suddenly first when VVT is switched and then drops when CVVL goes back to a smaller lift. However, engine jerk during deceleration is not as obvious as acceleration. The problems have been effectively solved and smooth and fast switching at engine dynamic conditions is realized through the introduction of a time filter for CVVL and VVT response speed and the cooperative control of CVVL, VVT and throttle opening angle.

Key words: engine, CVVL system, dynamic operations, control optimization