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Research Papers

Minimizing Seat Track Vibration That is Caused by the Automatic Start/Stop of an Engine in a Power-Split Hybrid Electric Vehicle

[+] Author and Article Information
Hsiu-Ying Hwang

Department of Vehicle Engineering,
National Taipei University of Technology,
No.1, Sec. 3, Zhong-Xiao E. Road,
Taipei 10608, Taiwan, China
e-mail: hhwang@mail.ntut.edu.tw

Contributed by the Design Engineering Division of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received October 6, 2012; final manuscript received February 22, 2013; published online June 19, 2013. Assoc. Editor: Dr. Corina Sandu.

J. Vib. Acoust 135(6), 061007 (Jun 19, 2013) (8 pages) Paper No: VIB-12-1281; doi: 10.1115/1.4023954 History: Received October 06, 2012; Revised February 22, 2013

The use of hybrid electric vehicles is an effective means of reducing pollution and improving fuel economy. Certain vehicle control strategies commonly automatically shut down or restart the internal combustion engines of hybrid vehicles to improve their fuel consumption. Such an engine autostart/stop is not engaged or controlled by the driver. Drivers often do not expect or prepare for noticeable vibrations, noise, or an unsmooth transition when the engine is autostarted/stopped. Unsmooth engine autostart/stop transitions can cause driveline vibrations, making the ride uncomfortable and the customer dissatisfied with the vehicle. This research simulates the dynamic behaviors associated with the neutral starting and stopping of a power-split hybrid vehicle. The seat track vibration results of analysis and hardware tests of the baseline control strategy are correlated. Several antivibration control strategies are studied. The results reveal that pulse cancellation and the use of a damper bypass clutch can effectively reduce the fluctuation of the engine block reaction torque and the vibration of the seat track by more than 70% during the autostarting and stopping of the engine. The initial crank angle can have an effect on the seat track vibration as well.

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Figures

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Fig. 1

Maximum peak-to-peak value of the vehicle seat track acceleration in the vertical direction during engine autostart

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Fig. 2

Engine cylinder pressure against crank angle under engine firing conditions with an engine speed of 1000 rpm

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Fig. 3

Engine cylinder pressure against crank angle under motoring conditions with an engine speed of 1000 rpm

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Fig. 4

Schematic plot of the power-split hybrid driveline simulation model

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Fig. 5

Stick diagram of the power-split hybrid driveline system

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Fig. 6

Single cylinder mechanism of the V6 engine

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Fig. 7

Layout of the power-split hybrid simulation model

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Fig. 8

Torque curves of powertrain components for the baseline power-split hybrid model during engine autostart and stop

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Fig. 9

Comparison of the engine block reaction torque at initial crank angle of 110 deg during engine autostart and stop

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Fig. 10

Comparison of the seat track accelerations in vertical direction with initial crank angle at 110 deg during engine autostart and stop

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Fig. 11

Comparison of the maximum peak-to-peak seat track acceleration in vertical direction with various initial crank angles during engine autostart

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