Vehicle motion control system for immediately terminating braking control when the vehicle enters onto a stepped or rough road
First Claim
1. A vehicle motion control system for maintaining stability of an automotive vehicle when said vehicle is in motion, by controlling a braking force applied to the front and rear wheels of said vehicle, comprising:
- vehicle condition monitor means for monitoring a condition of said vehicle in motion;
braking means for applying a braking force to each wheel of said vehicle, said braking means being actuated in response to depression of a brake pedal, and said braking means being actuated on the basis of an output of said monitor means and irrespective of depression of said brake pedal;
control variable setting means for setting a control variable for actuating said braking means, in accordance with at least a first parameter and a second parameter provided on the basis of the output of said monitor means, respectively, the control variable being varied in response to the output of said vehicle condition monitor means;
controlled variable calculating means for integrating the control variable varied in response to the output of said monitor means, while said braking means is actuated, to provide a controlled variable;
starting means for starting the actuation of said braking means when the control variable varied in response to the output of said monitor means exceeds a predetermined level in magnitude; and
terminating means for determining if the control variable varied in response to the output of said monitor means is within a predetermined zone provided in accordance with the first parameter and the second parameter, and for terminating the actuation of said braking means when the control variable is within the predetermined zone, and when the controlled variable provided by said controlled variable calculating means is less than a predetermined value.
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Accused Products
Abstract
The present invention is directed to a vehicle motion control system for maintaining vehicle stability by controlling the braking force applied to at least one wheel of a vehicle. A vehicle condition monitor is provided for monitoring a condition of the vehicle in motion. The braking force is applied by a braking apparatus to each wheel in response to depression of a brake pedal, and on the basis of an output of the monitor and irrespective of depression of the brake pedal. A control variable is provided for actuating the braking apparatus and set in accordance with at least a first parameter (e.g., wheel acceleration) and a second parameter (e.g., slip rate) which are provided on the basis of the output of the monitor, respectively, so that the control variable is varied in response to the output of the monitor. The control variable is integrated during the braking apparatus is actuated. The actuation of the braking apparatus starts when the control variable exceeds a predetermined level in magnitude, and is terminated when the control variable is within a predetermined zone provided in accordance with the first parameter and the second parameter, and when the controlled variable is less than a predetermined value.
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Citations
7 Claims
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1. A vehicle motion control system for maintaining stability of an automotive vehicle when said vehicle is in motion, by controlling a braking force applied to the front and rear wheels of said vehicle, comprising:
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vehicle condition monitor means for monitoring a condition of said vehicle in motion; braking means for applying a braking force to each wheel of said vehicle, said braking means being actuated in response to depression of a brake pedal, and said braking means being actuated on the basis of an output of said monitor means and irrespective of depression of said brake pedal; control variable setting means for setting a control variable for actuating said braking means, in accordance with at least a first parameter and a second parameter provided on the basis of the output of said monitor means, respectively, the control variable being varied in response to the output of said vehicle condition monitor means; controlled variable calculating means for integrating the control variable varied in response to the output of said monitor means, while said braking means is actuated, to provide a controlled variable; starting means for starting the actuation of said braking means when the control variable varied in response to the output of said monitor means exceeds a predetermined level in magnitude; and terminating means for determining if the control variable varied in response to the output of said monitor means is within a predetermined zone provided in accordance with the first parameter and the second parameter, and for terminating the actuation of said braking means when the control variable is within the predetermined zone, and when the controlled variable provided by said controlled variable calculating means is less than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification