現(xiàn)代雙語課件Active geometry control suspension system for the
enhancement of vehicle stability
U K Lee1*, S H Lee1
, C S Han2
, K Hedrick3
, and A Catala `4
1
Research and Development Division, Hyundai Motor Company, Hwaseong-Si, Gyeonggi-Do, Republic of Korea
2
Department of Mechanical Engineering, Hanyang University, Seoul, Republic of Korea
3
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA, USA
4
Applus IDIADA Automotive Technology, Santa Oliva, Spain
The manuscript was received on 16 August 2007 and was accepted after revision for publication on 13 February 2008.
DOI: 10.1243/09544070JAUTO693
Abstract: The active control of suspension geometry has historically been a challenging
perspective for chassis teams of worldwide automakers. Manufacturers and suppliers have
offered different solutions, but few have succeeded in combining a marked improvement in
handling performance, low-energy consumption, simplicity, and low cost.
The new and revolutionary approach of an active geometry control suspension (AGCS) reinvents
the possibilities of rear-suspension active toe control. This systememploys the use of the complexity
of a rear multi-link suspension, and a clever design layout to minimize the energy use. Additionally,
because of an efficient control logic strategy, the vehicle-handling performance and stability are
substantially improved. The system is the most successful in controlling vehicle transient situations
initiated mainly by aggressive lane-change manoeuvres at medium to high speeds.
This paper presents themost relevant actions of the development process of the AGCS. The use of
different evaluationmethods and accuratemeasurement equipment was crucial for optimization of
the system. The methods presented combine subjective evaluations in different road conditions
(icy, wet, and dry asphalt), suspension kinematics and elastokinematics characterization, and
objective road measurements using dynamic wheel position measurement equipment.
Finally, a comprehensive summary of the handling-test results are explained, which outline
the efficiency of the system, and its influence on the active safety level of the vehicle.
Keywords: active toe control, handling performance, stability, road objective evaluation
methods, kinematics and compliance testing, dynamic wheel position measurement
1 INTRODUCTION
Despite the increasing interest in chassis electronic
systems that use brake circuit and engine injection
control to improve vehicle stability at the limit of
adherence, vehicle dynamic properties in the mid-
range of lateral accelerations are normally controlled
by passive suspension systems. However, conven-
tional suspension systems are always limited by the
different performance trade-offs: handling, ride com-
fort, vibration isolation, tyre wear, and stability. This
means that, by artificially modifying the geometri
characteristics of the suspension parameters, there i
potential for improvement in vehicle response [1, 2
The system object of this study modifies rear to
angles, thus offering four-wheel steer (4WS) charac
teristics.
In 1938, Mercedes developed the first 4WS con
cept. Using this concept, a system steers the rea
wheels in the opposite direction to the front wheel
in order to shorten the turning radius. The first mas
production 4WS was the high capacity activel
controlled suspension of Nissan [3], which wa
installed in Skyline GTS coupe ´s. Unlike the situatio
in the Mercedes, the Skyline system steers the rea
wheels in the same direction as the front wheels
*Corresponding author: Research and Development Division,
Hyundai Motor Company, 772-1 Jangduk-dong, Hwaseong-Si,
Gyeonggi-Do, 445-706, Republic of Korea. email: mechanic
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