A Performance Comparison of the Iltis 1/4 T 4X4 Truck Equipped with Passive and Active Suspension Systems

Abstract

The purpose of this task was to develop a fully active suspension system for a 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 at 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 body lateral acceleration and actuator force feedback. The vehicle is capable 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. The active suspension system does add mechanical and hydraulic complexity to the vehicle. Consideration of an active suspension system for an in-service CF vehicle must weight the performance benefits against additional acquisition and'life-cycle costs in well defined usage and mission scenarios.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1994
Accession Number
ADA593825

Entities

People

  • A. W. Mccormac
  • D. G. Harding
  • D. M. Hanna
  • D. R. Fenrick

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Accumulators
  • Acquisition
  • Actuators
  • Assembly
  • Control Systems
  • Costs
  • Engineering
  • Failure Mode And Effect Analysis
  • Frequency
  • Hydraulic Accumulators
  • Life Cycle Costs
  • Life Cycles
  • Measurement
  • National Security
  • Reservoirs
  • Ride Quality

Readers

  • Logistics and Supply Chain Management.
  • Mathematics or Statistics
  • Robotics and Automation.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems