A PERFORMANCE COMPARISON OF THE ILTIS 1/4 T 4X4 TRUCK EQUIPPED WITH PASSIVE AND ACTIVE SUSPENSION SYSTEMS

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Authors
  1. Hanna, D.M.
  2. McCormac, A.M.
  3. Harding, D.G.
  4. Fenrick, D.R.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);HF Automotive Performance Research Inc, Medicine Hat ALTA (CAN)
Abstract
The purpose of this task was to develop a fully active suspension system for CF vehicle and to implement a variety of control schemes in order to demonstrate the benefits of this technology. An active suspension system has been developed and fitted on an Iltis 1/4 ton 4X4 military truck. The vehicle has on-board hydraulics and an electronic control system. The hydraulic system consists of a reservoir and an engine-driven pump which supplies oil (15.2 MP) to accumulators and servo-actuators aat each suspension assembly. The electronic control system is made up of transducers, an A/D card, a control computer, and analog control cards. The control computer calculates set points for the actuators, based on transducer input values, according to user specified control algorithms. A disturbance rejection algorithm was developed which reads and maintains individual actuator force values at initial levels, thereby providing good ride quality. Stability was enhanced by increasing the downward force on outside wheels in a turn based on boby lateral acceleration and actuator force feedback. The vehicle is capble of outperforming a passively suspended Iltis in virtually all test conditions attempted. Maximum attainable speeds increased by 11 percent in a steady-state turn, 20 percent in a slalom manoeuvre, and a speed increase in excess of 100 percent was possible while keeping driver accelerations at equivalent levels. TRUNCATED
Report Number
DRES-M-1428 — Memorandum; Final Report
Date of publication
01 Feb 1994
Number of Pages
29
DSTKIM No
94-01185
CANDIS No
139451
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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