Method for controlling a front and rear wheel steering vehicle
First Claim
1. A method for controlling a front and rear wheel steering vehicle having front wheels that can be steered according to a steering input, and rear wheels that can be steered according to the steering angle of the front wheels and a running condition of the vehicle, comprising the steps of:
- (a) steering said rear wheels in an opposite phase relationship to said front wheels to offset an under-steer tendency of said vehicle when a lateral acceleration acting on said vehicle is between a first prescribed value and a second prescribed value higher than said first prescribed value, and(b) steering said rear wheels in a same phase relationship to said front wheels to prevent an excessive slip angle from developing in said rear wheels when said lateral acceleration is greater than said second prescribed value, and a slip angle of said vehicle body would otherwise develop the excessive slip angle in said rear wheels.
1 Assignment
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Accused Products
Abstract
To the end of ensuring a brisk maneuverability of a front and rear wheel steering vehicle without causing any unstable behavior of the vehicle, the rear wheels are steered in an opposite phase relationship to the front wheels to offset an under-steer tendency of the vehicle when a lateral acceleration acting on the vehicle is between a first prescribed value and a second prescribed value higher than the first prescribed value, and the vehicle would otherwise demonstrate an under-steer tendency, and in a same phase relationship to the front wheels to prevent an excessive slip angle from developing in the rear wheels when the detected lateral acceleration is greater than the second prescribed value, and the slip angle of the rear wheels would otherwise develop an excessive slip angle. In other words, the rear wheels are steered in an opposite phase relationship to the front wheels so long as a lateral acceleration acting on the vehicle is within a range which would not give rise to any excessive slip angle of the rear wheels.
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Citations
20 Claims
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1. A method for controlling a front and rear wheel steering vehicle having front wheels that can be steered according to a steering input, and rear wheels that can be steered according to the steering angle of the front wheels and a running condition of the vehicle, comprising the steps of:
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(a) steering said rear wheels in an opposite phase relationship to said front wheels to offset an under-steer tendency of said vehicle when a lateral acceleration acting on said vehicle is between a first prescribed value and a second prescribed value higher than said first prescribed value, and (b) steering said rear wheels in a same phase relationship to said front wheels to prevent an excessive slip angle from developing in said rear wheels when said lateral acceleration is greater than said second prescribed value, and a slip angle of said vehicle body would otherwise develop the excessive slip angle in said rear wheels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a front and rear wheel steering vehicle comprising the steps of:
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(a) steering front wheels according to a steering input; (b) steering rear wheels according to a steering angle of the front wheels and a running condition of the vehicle; and (c) said rear wheels are steered in an opposite phase relationship to said front wheels so long as a lateral acceleration acting on said vehicle is within a range which would not give rise to any excessive slip angle of said rear wheels. - View Dependent Claims (12, 13, 14, 15)
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16. A method for controlling a front and rear wheel steering vehicle comprising the steps of:
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(a) steering front wheels according to a steering input; (b) steering rear wheels according to the steering angle of the front wheels and a running condition of the vehicle; and (c) at a certain traveling speed of said vehicle, steering said rear wheels at a same phase relationship, an opposite phase relationship, and a same phase relationship, in that order, relative to a steering direction of the front wheels as a steering angle of said front wheels increases. - View Dependent Claims (17, 18, 19, 20)
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Specification