Steering-wheel revolution number correction system of all-wheel-drive vehicle
AssigneeKomatsu Ltd.
InventorsTetsuo Kobayashi, Kazuhito Nishimaki
Life of this patent
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Abstract
Turning radius is calculated from steering angles of steering-wheels and articulation angles of respective frames, and the steering-wheels are automatically rotated faster than rear-wheels based on the turning radius, the revolution number of the rear-wheels, engine speed of an engine and a speed range of hydraulic motors, so that conventional trouble for manipulating operation lever etc. while turning a motor grader and skill-requiring work for adjusting the revolution number of the steering-wheels in accordance with the revolution number of the rear-wheels can be eliminated, thereby easily and accurately controlling the revolution number of the steering-wheels and securely preventing tight-corner braking phenomenon.
Claims5
A steering-wheel revolution number correction system used for an all-wheel-drive vehicle having an articulated frame in which a steering-wheel is driven by a hydraulic motor rotated by delivery oil from a hydraulic pump, the system comprising:
- a steering-wheel steering angle sensor for detecting a steering angle of a steering-wheel;
- an articulation angle sensor for detecting a connection angle of a front frame provided with the steering-wheel and a rear frame provided with the rear-wheel;
- a turning radius operation means for calculating a turning radius of the vehicle based on the steering direction and the steering angle of the steering-wheel, and the connection angle of the frames;
- a rear-wheel revolution number sensor for detecting a revolution number of the rear-wheel;
- and
- a steering-wheel revolution number controller for rotating the steering-wheel faster than the rear-wheel based on the turning radius and the revolution number of the rear-wheel,
- wherein the turning radius operation means utilizes a first function for computing turning radius when the steering angle of the steering wheel and the frame articulation direction are the same and a second function different from the first function when the turning direction of the steering wheel and the frame articulation direction are not the same.
Dependencies are inferred from the claim text.