US 12,269,309 B2
Suspension stroke related value estimation device and method
Yanqing Liu, Susono (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Oct. 14, 2021, as Appl. No. 17/501,335.
Claims priority of application No. 2020-174527 (JP), filed on Oct. 16, 2020.
Prior Publication US 2022/0118812 A1, Apr. 21, 2022
Int. Cl. B60G 17/00 (2006.01); B60G 17/018 (2006.01); B60G 17/06 (2006.01)
CPC B60G 17/0182 (2013.01) [B60G 17/06 (2013.01); B60G 2204/62 (2013.01); B60G 2400/202 (2013.01); B60G 2400/252 (2013.01); B60G 2500/104 (2013.01); B60G 2600/182 (2013.01); B60G 2600/70 (2013.01); B60G 2600/73 (2013.01); B60G 2800/162 (2013.01); B60G 2800/70 (2013.01); B60G 2800/916 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A suspension stroke related value estimation device for a vehicle, comprising a damping force generator configured to generate a damping force that damps a relative vibration between a sprung and an unsprung at each wheel position according to a supplied control current, a control unit configured to control the control current supplied to the damping force generator, and a detection device configured to detect a vertical acceleration of the sprung, and is configured to calculate at least one of a relative displacement and a relative velocity between the sprung and the unsprung as a stroke related value for a corresponding suspension, wherein
the control unit includes a storage device that stores relationships between the supplied control current and coefficients of two functions for functionally identifying an equivalent damping coefficient and an equivalent spring constant of each suspension that change according to the control current and a frequency of the relative vibration,
the control unit is configured to determine the coefficients of the two functions based on the control current supplied to the damping force generator and the relationships, and calculate at least one of the relative displacement and relative velocity between the sprung and the unsprung based on the vertical acceleration of the sprung detected by the detection device and the two functions in which the coefficients are determined.