All-wheel steering for road vehicle

摘要

The all-wheel steering for a vehicle with a large rear overhang has the rear wheel steering operating in the opposite direction to the front wheels to reduce the turning circle. From the straight ahead starting position the rear wheel steering follows that of the front wheels with varying proportion. Initially the rate of change of the rear wheel steering is slower than the front wheel. This rate of change increases to a similar rate, for mid range steering, and finally both axles have equal but opposite steering deflections. The initial steering, with the rear wheels only slowly steered, enables the vehicle to ease into the curve without the rear end swinging out. The increasing rear wheel deflection progressively swings the rear of the vehicle outwards, after the vehicle has left its original ahead track.