Vehicle damping force control with roll angle and pitch angle
First Claim
1. A vehicle damping force control apparatus comprising:
- shock absorbers disposed between a vehicle body and each of four wheels suspended to the vehicle body by a suspension system, each of which can individually change generated damping force in accordance with a turning state of the vehicle;
a front-wheel and rear-wheel damping force calculating unit that calculates the total of the damping forces required for the front-wheel-side shock absorbers corresponding to the front wheels and the total of the damping forces required for the rear-wheel-side shock absorbers corresponding to the rear wheels as a front-wheel-side target damping force and a rear-wheel-side target damping force respectively to suppress a pitching caused on the vehicle body during the turning of the vehicle;
a damping coefficient calculating unit that calculates damping coefficients for the shock absorbers corresponding to the four wheels by using the front-wheel-side target damping force and the rear-wheel-side target damping force respectively to suppress roll exerted on the vehicle body during the turning of the vehicle;
a shock absorber control unit that controls the damping forces generated by the shock absorbers corresponding to the four wheels respectively in accordance with the calculated damping coefficients;
a roll angle detecting unit that detects a roll angle of the vehicle body during the turning of the vehicle;
a pitch angle detecting unit that detects a pitch angle of the vehicle body during the turning of the vehicle;
a target pitch angle calculating unit that calculates a target pitch angle of the vehicle body in accordance with the detected roll angle; and
a target damping force determining unit that determines the total of the damping forces required for the front-wheel-side shock absorbers and the total of the damping forces required for the rear-wheel-side shock absorbers as the front-wheel-side target damping force and the rear-wheel-side target damping force respectively to make the detected pitch angle coincide with the calculated target pitch angle.
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Accused Products
Abstract
A damping force control apparatus with adjustable shock absorbers is disclosed. An electronic control unit calculates estimated roll angle and estimated pitch angle of a vehicle body based on detected sprung accelerations, calculates a target pitch angle from the estimated roll angle, and determines target damping force required for front-wheel-side shock absorbers such that the stimulated pitch angle coincides with the target pitch angle; calculates rear-wheel-side jack-up force exerted on the rear-wheel-side vehicle body based on detected vehicle speed detected yaw rate and detected lateral acceleration, and determines the force in the direction for overcoming the calculated jack-up force as target damping force of rear-wheel-side shock absorbers; and controls the operation of each actuator based on the rear-wheel-side and front-wheel-side target damping forces.
20 Citations
13 Claims
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1. A vehicle damping force control apparatus comprising:
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shock absorbers disposed between a vehicle body and each of four wheels suspended to the vehicle body by a suspension system, each of which can individually change generated damping force in accordance with a turning state of the vehicle; a front-wheel and rear-wheel damping force calculating unit that calculates the total of the damping forces required for the front-wheel-side shock absorbers corresponding to the front wheels and the total of the damping forces required for the rear-wheel-side shock absorbers corresponding to the rear wheels as a front-wheel-side target damping force and a rear-wheel-side target damping force respectively to suppress a pitching caused on the vehicle body during the turning of the vehicle; a damping coefficient calculating unit that calculates damping coefficients for the shock absorbers corresponding to the four wheels by using the front-wheel-side target damping force and the rear-wheel-side target damping force respectively to suppress roll exerted on the vehicle body during the turning of the vehicle; a shock absorber control unit that controls the damping forces generated by the shock absorbers corresponding to the four wheels respectively in accordance with the calculated damping coefficients; a roll angle detecting unit that detects a roll angle of the vehicle body during the turning of the vehicle; a pitch angle detecting unit that detects a pitch angle of the vehicle body during the turning of the vehicle; a target pitch angle calculating unit that calculates a target pitch angle of the vehicle body in accordance with the detected roll angle; and a target damping force determining unit that determines the total of the damping forces required for the front-wheel-side shock absorbers and the total of the damping forces required for the rear-wheel-side shock absorbers as the front-wheel-side target damping force and the rear-wheel-side target damping force respectively to make the detected pitch angle coincide with the calculated target pitch angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification