PREVIEW CONTROL ALGORITHMS FOR THE ACTIVE SUSPENSION OF AN OFF-ROAD VEHICLE

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Authors
  1. Langlois, R.G.
  2. Hanna, D.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);Queen's Univ, Kingston ONT (CAN) Dept of Mechanical Engineering
Abstract
Preview control of vehicle suspension offers the potential for significant improvements in ride quality over rough terrain. Most work done in this area has been based on optimal control theory using simple vehicle models. The performance of quarter vehicle based preview controllers is investigated using both quarter and full vehicle simulation models and a realistic off-road terrain profile. The results confirm that preview active suspensions offer significant improvements in ride quality over passive suspensions. In addition to reduced vertical acceleration of the body, pitch and roll motions are also reduced as corollary benefits of reduced vertical displacements of the vehicle quarters. Coupling forces between quarters appear to have a stabilizing effect on the control. The performance improvement realizable on real vehicles is found to be limited by the available suspension travel. An alternative approach to optimal control theory is used to develop a full vehicle multi-criteria preview controller based on isolating the vehicle body from dynamic loads transmitted through the suspension. Preview information is used to detect when an adjustment of vehicle body position and attitude is required, in which case appropriate forces are applied to the body. TRUNCATED
Keywords
Adaptive suspension;Active suspension;Preview controls;Offroad vehicles
Report Number
DRES-CR-98-20 — Contract Report
Date of publication
01 Aug 1991
Number of Pages
117
DSTKIM No
98-01919
CANDIS No
508621
Format(s):
Hardcopy;Document Image stored on Optical Disk

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