Steering-wheel revolution number correction system of all-wheel-drive vehicle
First Claim
1. 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.
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Accused Products
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.
99 Citations
5 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification