This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Stabilizing Steering Weave with Active Torque Versus Semi-Active Damping
Annotation ability available
Sector:
Language:
English
Abstract
A steering stabilizing algorithm for automobiles commands transient steering control torques so that the sum of natural steering restoring torque and the control torque is more nearly in phase with steer angle than the natural restoring torque alone. The resulting reduction in the phase lag from steer angle to restoring torque mitigates the steering weave mode. Natural restoring torque determined from a measured lateral acceleration signal can be compared to expected steady-state restoring torque calculated from steer angle and vehicle speed. Commands to a steering torque actuator depend on the difference signal, which is nonzero during rapid transients only. The character of control torques required is different from passive steering damping, so that an active control torque gives the best, response. Simulations show that a rapidly-controlled variable steering damper could apply the desired weave control torque a fraction of the time, resulting in significant weave mode mitigation. A weave stabilizer which operates by semi-active damping would be safer than an actively controlled steering torque motor in the event of control circuitry failure.
Recommended Content
Authors
Citation
Whitehead, J., "Stabilizing Steering Weave with Active Torque Versus Semi-Active Damping," SAE Technical Paper 891981, 1989, https://doi.org/10.4271/891981.Also In
References
- Segel, L. Theoretical Prediction and Experimental Substantiation of the Response of the Automobile to Steering Control. Institution of Mechanical Engineers Proceedings of the Automobile Division No. 7 310 330 1956
- Segel, L. On the Lateral Stability and Control of the Automobile as Influenced by the Dynamics of the Steering System. ASME Journal of Engineering for Industry 283 295 August 1966
- Jaksch, F. Handling , and Stability: Volvo's Experimental Safety Car Society of Automotive Engineers Transactions, 730591 1973
- Whitehead, J. Four Wheel Steering: Maneuverability and High Speed Stabilization SAE Trans. 880642 1988
- Whitehead, J. Stabilizing the Steering Weave Mode SAE Trans. 881136 1988
- Whitehead, J. Steering Stabilizing Method and Apparatus
- Whitehead, J. A Prototype Steering Weave Stabilizer for Automobiles. ASME Winter Annual Meeting, Joint Symposium on Advanced Automotive Technologies, to be presented 1989
- Karnopp, D. Design Principles for Vibration Control Systems Using Semi-Active Dampers ASME Journal of Dynamic Systems Measurement and Control
- Maeda, T. Irie N. Hidaka K. Nishimura H. Performance of Driver-Vehicle System in Emergency Avoidance SAE Trans. 770130 1977
- Whitehead, J. Rear Wheel Steering Dynamics Compared to Front Steering ASME Journal of Dynamic Systems Measurement and Control 1990