改善乘用车低转速振动的动力总成控制优化策略

doi:10.3969/j.issn.1674-8484.2021.02.007

汽车安全与节能学报 ›› 2021, Vol. 12 ›› Issue (2): 193-200.DOI: 10.3969/j.issn.1674-8484.2021.02.007

改善乘用车低转速振动的动力总成控制优化策略

张学锋(), 刘治文, 陈国栋, 杨云波, 李守魁

中国第一汽车股份有限公司研发总院,长春130011,中国

收稿日期:2021-03-15 出版日期:2021-06-30 发布日期:2020-04-01
作者简介:张学锋(1986-),男（汉）,山东,工程师。E-mail：zhangxuefeng2@faw.com.cn
基金资助:
国家重点研发计划资助(2020YFB2010300)

Optimal strategy of passenger car powertrain control for improving vibration at low engine speed

ZHANG Xuefeng(), LIU Zhiwen, CHEN Guodong, YANG Yunbo, LI Shoukui

R&D Institute, China FAW Co., Ltd., Changchun 130011, China

Received:2021-03-15 Online:2021-06-30 Published:2020-04-01

摘要/Abstract

摘要：

为解决搭载自动变速器的乘用车在高挡低转速加速行驶时,车内存在振动并同时伴随低频轰鸣的问题,从振源、传递路径、发生机理等方面进行分析,论证了飞轮惯量、半轴刚度、扭转减振器刚度、动力吸振器、动力总成软件控制策略等方面对解决车内振动和轰鸣问题的效果。在综合评估项目周期、改动成本以及可实施性等因素后,通过一种动力总成标定控制的优化方案,来解决此振动问题。进行了实车噪声—振动—声振粗糙度（NVH）试验。结果表明：采用此优化策略的乘用车在高挡位、低转速加速行驶时,车内振动幅值综合减小44%,改善效果明显。

关键词: 汽车舒适性, 动力总成, 振动轰鸣, 滑摩控制, 标定策略

Abstract:

The vibration source, transmission path and occurring mechanism were analyzed inside a passenger car equipped with automatic transmission accelerating at high gear and low engine speed to solve the problems of vibration accompanied with low frequency roar. The effect on solving the vibration and roar problems inside the car from the aspects of flywheel inertia, half shaft stiffness, torsional damper stiffness, dynamic vibration absorber and powertrain software control strategy were demonstrated. A way was adopted through powertrain calibration control after evaluating comprehensively the factors such as project cycle, modification cost and practicability, to optimize the vibration problems. A series of noise-vibration-harshness (NVH) experiment was conducted on real vehicle. The results show that the vibration amplitude inside the car can be decreased by 44% comprehensively driving at high gear and low engine speed with the optimization strategy. Therefore, the improvement effect is significant.

Key words: vehicle comfort, powertrain, vibration and roar, slip control, calibration strategy

中图分类号:

U467.1

张学锋, 刘治文, 陈国栋, 杨云波, 李守魁. 改善乘用车低转速振动的动力总成控制优化策略[J]. 汽车安全与节能学报, 2021, 12(2): 193-200.

ZHANG Xuefeng, LIU Zhiwen, CHEN Guodong, YANG Yunbo, LI Shoukui. Optimal strategy of passenger car powertrain control for improving vibration at low engine speed[J]. Journal of Automotive Safety and Energy, 2021, 12(2): 193-200.

图/表 18

图1 座椅导轨、转向盘二阶振动幅值

图2 飞轮增加质量环

图3 飞轮转动惯量增加40%后的传动系扭振

方案		D / mm
方案	左	中间	右
原	28	30	28
优化	31	30	31

表1 增大驱动半轴直径具体方案

图4 驱动半轴扭转刚度增加30%后的传动系扭振

图5 扭转减振器刚度优化方案

图6 扭转减振器刚度降低25%后的传动系扭振

转动惯量,J	10 g·m²
固有频率,f	38 Hz
阻尼因数,c	0.2

表2 动力吸振器参数

图7 变速器端添加动力吸振器后传动系扭振

图8 增加闭锁离合器滑摩控制后传动系扭振

图9 引入滑摩控制及解、闭锁策略优化

图10 降挡线及升挡线优化

图11 发动机扭矩输出特性优化

图12 优化输出扭矩前后限值扭矩对应油门开度

图13 动力总成控制优化方案效果

	A_max / (mm·s^-1)
	座椅导轨		转向盘
	优化前	优化后	优化前	优化后
5挡	1.26	0.58	10.63	5.60
6挡	1.05	0.59	9.00	5.50
工程目标值	0.60	0.60	6.00	6.00

表3 车内振动优化前后结果对比

图14 优化前后整车NEDC工况循环油耗

	e[CO] / (mg·km^-1)					PM	PN
	CO	THC	NMHC	NO_x	N₂O	mg·km^-1	10¹¹ km^-1
优化前	446	49	34	32	12	0.536	4.153
优化后	448	47	33	30	13	0.534	4.120

表4 优化前后整车WLTC排放结果对比

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改善乘用车低转速振动的动力总成控制优化策略

Optimal strategy of passenger car powertrain control for improving vibration at low engine speed

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