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

doi:10.3969/j.issn.1674-8484.2021.02.007

Abstract

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

CLC Number:

U467.1

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.

Figures/Tables 18

References 12

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

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

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

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

	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