Vehicle control device and vehicle control method
A vehicle control device includes a variable-damping-force shock absorber, a sprung mass vibration damping control, an unsprung mass vibration damping control device, and a damping force control device configured to calculate a damping force control amount on the basis of a sprung-mass vibration damping control amount when the sprung-mass vibration damping amount is greater than an unsprung-mass vibration damping control amount, calculating a damping force control amount on the basis of the unsprung-mass vibration damping amount so as to maintain the damping force distribution factor when the sprung-mass vibration damping amount is equal to or less than the unsprung-mass vibration damping amount, and controlling the damping force of the variable-damping-force shock absorber.
1. A vehicle control device comprising:
a variable-damping-force shock absorber configured to adjust damping force;
a sprung mass vibration damping control device configured to calculate a sprung-mass vibration damping control amount, which is a damping force to minimize sprung mass vibration;
an unsprung mass vibration damping control device configured to calculate an unsprung-mass vibration damping control amount, which is a damping force to minimize unsprung mass vibration, the unsprung-mass vibration damping control amount being calculated separately from the sprung-mass vibration damping control amount; and
a damping force control device configured to calculate a damping force control amount on the basis of the sprung-mass vibration damping control amount when the sprung-mass vibration damping amount is greater than the unsprung-mass vibration damping control amount, calculate the damping force control amount on the basis of the unsprung-mass vibration damping amount so as to maintain the damping force distribution factor when the sprung-mass vibration damping amount is equal to or less than the unsprung-mass vibration damping amount, and control the damping force of the variable-damping-force shock absorber based on the damping force control amount.
2. The vehicle control device according to claim 1 , wherein
the unsprung mass vibration damping control device is configured to calculate the unsprung-mass vibration damping control amount on the basis of changes in wheel speed.
3. A vehicle control device comprising:
a controller configured to calculate a sprung-mass vibration damping control amount, which is a damping force to minimize sprung mass vibration, on the basis of a damping force distribution factor for wheels corresponding to a target orientation, calculate an unsprung-mass vibration damping control amount, which is a damping force to minimize unsprung mass vibration, the unsprung-mass vibration damping control amount being calculated separately from the sprung-mass vibration damping control amount, calculating a damping force control amount on the basis of the sprung-mass vibration damping control amount when the sprung-mass vibration damping amount is greater than the unsprung-mass vibration damping control amount, and calculate the damping force control amount on the basis of the unsprung-mass vibration damping amount so as to maintain the damping force distribution factor when the sprung-mass vibration damping amount is equal to or less than the unsprung-mass vibration damping amount; and
a variable-damping-force shock absorber configured to generate damping force according to the damping force control amount.
4. A vehicle control method comprising:
calculating, via a controller, a sprung-mass vibration damping control amount, which is a damping force for minimizing sprung mass vibration on the basis of a damping force distribution factor for wheels corresponding to a target orientation;
calculating, via the controller, an unsprung-mass vibration damping control amount, which is a damping force for minimizing unsprung mass vibration, the unsprung-mass vibration damping control amount being calculated separately from the sprung-mass vibration damping control amount; and
calculating, via the controller, a damping force control amount on the basis of the sprung-mass vibration damping control amount when the sprung-mass vibration damping amount is greater than the unsprung-mass vibration damping control amount, calculating, via the controller, the damping force control amount on the basis of the unsprung-mass vibration damping amount so as to maintain the damping force distribution factor when the sprung-mass vibration damping amount is equal to or less than the unsprung-mass vibration damping amount, and controlling, via the controller, the damping force of a variable-damping-force shock absorber according to the damping force control amount.