The optimum control pattern for rear-wheel steering was confirmed through vehicle motion analyses and through experiments conducted with an experimental four-wheel steering vehicle. A simple analytical model having two inputs and two outputs was used to present the steering signal transmission paths. The experimental vehicle was equipped with an electronically-controlled hydraulic servo system that allowed the rear wheels to be steered as desired. It was found that vehicle controllability and stability can be improved by steering the rear wheels in the same phase as the front wheels at high speed. Further, the steering response and stability of the vehicle can be enhanced by providing a certain delay in the timing for rear-wheel steering, rather than steering the rear and front wheels simultaneously. It was also found that the front-wheel steering force and vehicle velocity should be used as the control signals for rear-wheel steering instead of the front wheel steer angle and vehicle velocity which have been proposed up to now. By using these parameters for the control signals, vehicle stability can be further improved.
Hicas - improvement of vehicle stability and controllability by rear suspension steering characteristics
Verbesserung der Fahrzeugstabilitaet und -kontrolle durch Lenkungsprinzipien der Hinterradaufhaengung
21th Automobile Technical Congr. FISITA ; 2 , Jun ; 81-88
1986
8 Seiten, 22 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch
Effect of rear-axle steering on vehicle controllability and stability of medium-duty truck
Kraftfahrwesen | 1993
|Steering Controllability Characteristics
NTIS | 1977
|Effect of Rear-Axle Steering on Vehicle Controllability and Stability of a Medium-Duty Truck
British Library Conference Proceedings | 1993
|