US 12,145,413 B2
Suspension control device, vehicle, and suspension control method
Yuichiro Minakuchi, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
Filed on Apr. 5, 2023, as Appl. No. 18/296,114.
Application 18/296,114 is a continuation of application No. PCT/JP2021/028168, filed on Jul. 29, 2021.
Claims priority of application No. 2020-196395 (JP), filed on Nov. 26, 2020.
Prior Publication US 2023/0241940 A1, Aug. 3, 2023
Int. Cl. B60G 17/0165 (2006.01); B60G 17/018 (2006.01)
CPC B60G 17/0165 (2013.01) [B60G 17/018 (2013.01); B60G 2500/10 (2013.01); B60G 2600/1875 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A suspension control device which controls an operation of a suspension of a vehicle comprising:
an operation-induced state quantity estimation portion which estimates an operation-induced state quantity which represents behavior caused by an operation of the vehicle;
a road surface-induced state quantity estimation portion which estimates a road surface-induced state quantity which represents behavior of the vehicle caused by a road surface on which the vehicle travels;
an operation-induced state quantity conversion portion which converts the operation-induced state quantity into an operation-induced required damping force by multiplying the operation-induced state quantity by a predetermined first coefficient;
a road surface-induced state quantity conversion portion which converts the road surface-induced state quantity into a road surface-induced required damping force by multiplying the road surface-induced state quantity by a predetermined second coefficient, and which converts the road surface-induced state quantity into the road surface-induced required damping force so that a magnitude of the road surface-induced required damping force and a magnitude of the operation-induced required damping force are relatively different when the operation-induced state quantity and the road surface-induced state quantity are the same; and
a current value calculation portion which determines a current value to be applied to the suspension with reference to the operation-induced required damping force, the road surface-induced required damping force, and a damper speed, which is a speed of a damper of the suspension.