VEHICLE DAMPING FORCE CONTROL APPARATUS
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Abstract
A damping force control apparatus has shock absorbers 10 each being capable of changing damping force. An electronic control unit 40 calculates estimated roll angle and estimated pitch angle of a vehicle body BD in accordance with sprung accelerations detected by sprung acceleration sensors 41 fl to 41rr, calculates a target pitch angle from the estimated roll angle, and determines target damping force required for front-wheel-side shock absorbers 10 such that the estimated pitch angle coincides with the target pitch angle. The electronic control unit 40 calculates rear-wheel-side jack-up force exerted on the rear-wheel-side vehicle body in accordance with vehicle speed detected by a vehicle speed sensor 43, yaw rate detected by a yaw rate sensor 44 and lateral acceleration detected by a lateral acceleration sensor 45, and determines the force in the direction for overcoming the calculated jack-up force as target damping force of rear-wheel-side shock absorbers 10. The electronic control unit 40 controls the operation of each actuator 31 in accordance with the rear-wheel-side and front-wheel-side target damping forces.
41 Citations
17 Claims
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1-8. -8. (canceled)
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9. 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; front-wheel and rear-wheel damping force calculating means 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; damping coefficient calculating means 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; and shock absorber control means that controls the damping forces generated by the shock absorbers corresponding to the four wheels respectively in accordance with the calculated damping coefficients. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification