Active Front Steering (AFS) systems have recently been introduced for passenger vehicles to improve handling stability under adverse road conditions. AFS provides a mechanism to augment the steering angle with a small displacement actuator. In this configuration, the steering angle of the front wheels is the combined input of the handwheel with an additional small angle component from an electronically controlled actuator. This paper investigates AFS for large trucks to assist in avoiding jackknife conditions. Emphasis is given to design aspects to minimize the tendency of AFS systems to interfere with the driver's perception of the vehicle responsiveness. This paper has presents initial results for developing an AFS system for large trucks. Because of the impact of such systems on the safe operation of tractor-trailers, it is important to carefully weigh the benefits and hazards of deploying AFS systems in fleet operations. The research presents a method to quantify the trade-offs of increased stability versus the driver's perception of controlling the vehicle dynamics during emergency conditions. These metrics have shown that increasing the AFS level beyond a certain degree in stabilizing the tractor-trailer will tend to interfere with the drivers actions. However an optimal range of feedback gains does exist to provide good stability for avoiding jackknife conditions while minimizing the driver's perception that the vehicle dynamics have been modified.
Jackknife avoidance in large trucks using active front steering
Vermeidung einer Querstellung des Anhängers bei großen Lastzügen mit aktiver Frontlenkung
2004
7 Seiten, 8 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
Jackknife avoidance in large trucks using active front steering
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