Control device for vehicle power steering
First Claim
1. A device for controlling electrically-driven power steering apparatus of a vehicle, the device calculating a target value of steering assist torque based upon at least steering torque;
- calculating a target value of steering converging torque based upon at least a steering velocity;
calculating a target value of total modification torque to be generated with the power steering apparatus based upon at least the target values of the steering assist torque and steering converging torque; and
controlling the power steering apparatus based upon the target total modification torque;
characterized in that the device further calculates a target value of behavioral deterioration-suppressing torque for suppressing steering causing a vehicle behavioral deterioration when the vehicle falls into oversteered or understeered conditions, and renders a degree of contribution of the target value of the behavioral deterioration-suppressing torque to the target value of the total modification torque higher than a degree of contribution of the target value of the steering converging torque to the target value of the total modification torque when a predetermined condition is satisfied.
1 Assignment
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Accused Products
Abstract
A novel control device for a vehicle power steering apparatus or system is improved for providing preferable steering convergnecy even under the execution of VSC, while ensuring the steering smoothness under normal running conditions. In the control device, the target value of total modification torque to be added to steering torque through an power steering apparatus, is calculated based upon steering assist torque, calculated based upon at least steering torque; steering converging torque, based upon a steering velocity; and behavioral deterioration-suppressing torque for suppressing unwanted steering motions which would cause further deterioration of a vehicle behavior under oversteered or understeered conditions. In this calculation, when a predetermined condition is satisfied, the degree of contribution of the target value of the behavioral deterioration-suppressing torque to the target value of the total modification torque is rendered higher than the degree of contribution of the target value of the steering converging torque to the target value of the total modification torque.
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Citations
11 Claims
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1. A device for controlling electrically-driven power steering apparatus of a vehicle, the device calculating a target value of steering assist torque based upon at least steering torque;
- calculating a target value of steering converging torque based upon at least a steering velocity;
calculating a target value of total modification torque to be generated with the power steering apparatus based upon at least the target values of the steering assist torque and steering converging torque; and
controlling the power steering apparatus based upon the target total modification torque;
characterized in that the device further calculates a target value of behavioral deterioration-suppressing torque for suppressing steering causing a vehicle behavioral deterioration when the vehicle falls into oversteered or understeered conditions, and renders a degree of contribution of the target value of the behavioral deterioration-suppressing torque to the target value of the total modification torque higher than a degree of contribution of the target value of the steering converging torque to the target value of the total modification torque when a predetermined condition is satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- calculating a target value of steering converging torque based upon at least a steering velocity;
Specification