Vehicle steering control system based on vehicle body side slip angle
First Claim
1. A vehicle steering control system, comprising:
- a rear wheel steering device;
a vehicle body side slip angular speed detecting unit for obtaining a vehicle body side slip angular speed at a point ahead of a rear axle of the vehicle body; and
a steering control unit for actuating said rear wheel steering device so as to reduce a magnitude of the vehicle body side slip angular speed obtained by said vehicle body side slip angular speed detecting unit.
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Accused Products
Abstract
In a four wheel steering vehicle, the rear wheels are steered so as to reduce a magnitude of the vehicle body side slip angular speed. Thus, whenever there is a rise in the vehicle body side slip angle which is directed outward with respect to the turning circle of the vehicle at an early stage of turning operation, the rear wheels are steered in opposite sense to the front wheel steering angle. Therefore, the vehicle body side slip angle is at least partly canceled, and this in turn increases the yaw moment and produces a sharp heading response. As the vehicle continues the turning operation, the rear wheels are steered in the same phase as the front wheels, thereby offsetting the tendency of the vehicle to go into a spin. When the vehicle is turning at a steady rate without incurring any change in the vehicle body side slip angle, the rear wheels are not steered, and the vehicle essentially behaves as if it were a front wheel steering vehicle.
21 Citations
6 Claims
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1. A vehicle steering control system, comprising:
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a rear wheel steering device;
a vehicle body side slip angular speed detecting unit for obtaining a vehicle body side slip angular speed at a point ahead of a rear axle of the vehicle body; and
a steering control unit for actuating said rear wheel steering device so as to reduce a magnitude of the vehicle body side slip angular speed obtained by said vehicle body side slip angular speed detecting unit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification