Rear wheel steering apparatus for vehicle
First Claim
1. A rear wheel steering apparatus for a vehicle, comprising:
- a vehicle speed sensor for detecting a vehicle speed;
means for detecting a turning condition of the vehicle;
rear wheel steering angle driving means for varying the steer angle of each of the right and left rear wheels; and
rear wheel steering angle control means for calculating a toe-in quantity, representing the angular orientation of said rear wheels with respect to each other, as an increasing function of the vehicle, speed;
calculating a reference rear wheel steering angle on the basis of the turning condition of the vehicle, calculating a steer angle of each of said right and left rear wheels on the basis of said toe-in quantity and said reference rear wheel steer angle, and controlling said rear wheel steer angle driving means on the basis of the calculated steer angle of each of said right and left rear wheels such that the steer angle of each of said right and left rear wheels and the toe-in quantity of said rear wheels changes by predetermined angles.
1 Assignment
0 Petitions
Accused Products
Abstract
A rear wheel steering apparatus for a vehicle has a vehicle speed sensor for detecting a vehicle speed, a front wheel steer angle sensor for detecting a steer angle of front wheels of the vehicle, a rear wheel steer angle driving device for varying the steer angle of each of the right and left rear wheels, and a rear wheel steer angle controller for controlling the rear wheel steer angle driving device. The controller is adapted to calculate a toe-in quantity of the rear wheels as an increasing function of the vehicle speed, calculate a steer angle of each of the right and left rear wheels by the use of the vehicle speed and the steer angle of the front wheels, and control the rear wheel steer angle driving device on the basis of results of these calculating operations such that the steer angle of each of the right and left rear wheels changes by a predetermined angle. Accordingly, it is possible to improve the response to the steering input for turning the vehicle.
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Citations
19 Claims
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1. A rear wheel steering apparatus for a vehicle, comprising:
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a vehicle speed sensor for detecting a vehicle speed; means for detecting a turning condition of the vehicle; rear wheel steering angle driving means for varying the steer angle of each of the right and left rear wheels; and rear wheel steering angle control means for calculating a toe-in quantity, representing the angular orientation of said rear wheels with respect to each other, as an increasing function of the vehicle, speed;
calculating a reference rear wheel steering angle on the basis of the turning condition of the vehicle, calculating a steer angle of each of said right and left rear wheels on the basis of said toe-in quantity and said reference rear wheel steer angle, and controlling said rear wheel steer angle driving means on the basis of the calculated steer angle of each of said right and left rear wheels such that the steer angle of each of said right and left rear wheels and the toe-in quantity of said rear wheels changes by predetermined angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rear wheel steering apparatus for a vehicle, comprising:
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a vehicle speed sensor for detecting a vehicle speed; means for detecting a turning condition of the vehicle; right rear wheel steer angle driving means for varying the steer angle of a right rear wheel of said vehicle and left rear wheel steer angle driving means for varying the steer angle of a left rear wheel of said vehicle; and rear wheel steering angle control means for calculating a toe-in quantity, representing the angular orientation of said rear wheel with respect to each other, as an increasing function of the vehicle speed;
controlling said right and left rear wheel steer angle driving means such that the calculated toe-in quantity is given to said right and left rear wheel;
calculating, when said vehicle makes a turn, a reference rear wheel steering angle based upon the turning condition of the vehicle, calculating steer angles of said right and left rear wheels based on the calculated toe-in quantity and the calculated reference rear wheel steering angle; and
controlling said right and left rear wheel steer angle driving means on the basis of the calculated steer angles of each of said right and left rear wheels such that the steer angle of each of said right and left rear wheels and the toe-in quantity of said rear wheels changes by predetermined angles. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification