插电混合动力汽车熄火抖动优化
2019-10-21相龙洋顾彦魏娜
相龙洋 顾彦 魏娜



摘 要:插电混合动力汽车的怠速工况,发动机为电池充电,因此其怠速转速比传统燃油车更高。在熄火过程中可能会出现抖动较大的问题,引起较大抱怨,严重影响整车品质。文章对车内振动、发动机转速和发动机内部控制参数进行了深入测试及分析。综合利用时频分析,相关性分析和与燃油车对比分析的方法来识别熄火抖动较大的原因。研究表明,插电混合动力汽车由于怠速转速较高,熄火时转速下降较慢,激起了系统零部件结构模态引起较大抖动。通过优化标定策略可以迅速减小熄火过程的进气量,使转速更快下降至停止,该方案将熄火过程的抖动幅值改善了40%,主观感受较好,达到优化目标。
关键词:插电混合动力汽车;熄火抖动;标定优化;进气量
中图分类号:U469.72 文献标识码:A 文章编号:1671-7988(2019)12-129-03
Abstract: The idle condition of plug-in hybrid electric vehicle (PHEV) is different from that of traditional vehicle. The engine charges for the battery so that the idle engine rotational speed is higher than that of traditional vehicle. The power-off shake of PHEV may cause complaint. The vehicle vibration, engine speed and internal parameters are measured and analyzed. Then the time-frequency analysis, relevant analysis and comparison with traditional vehicle are conducted to identify the source of the power-off shake. The study reveals some conclusions. The slower engine speed drop stimulates the mode of one component to cause obvious shake. The calibration optimization allows less air into the engine during the power-off condition to make the speed drop much faster to zero. The optimization could improve the power-off shake by 40%.
Keywords: plug-in hybrid electric vehicle; power-off shake; calibration optimization; intake air
前言
汽車作为最常用的交通工具之一,各种工况下的车内主观感受越来越引起用户和厂商的关注。汽车点火,怠速和熄火是每次开车时不可避免的工况。因而怠速熄火的车内抖动水平也是需要重点关注的。汽车是一个极其复杂的系统,包含各种振动噪声激励源,这些激励会通过不同的路径传递到关注的响应点,在此过程中会经过结构的衰减或放大[1]。由于传递路径的复杂性和局限性,为了从根本上降低响应点处的振动噪声幅值,优化激励源才是最有效的措施。
插电混合动力汽车与传统燃油车相比,工况更多,其怠速充电工况是最常用的工况之一。……
