An apparatus and a method for controlling vehicle suspension, which controls a variable damper in consideration of virtual tire damping, may include a variable damper which is installed between a vehicle body and a wheel, a first acceleration sensor which is installed at each corner of the vehicle body to measure a vehicle body corner vertical acceleration, a second acceleration sensor which is installed to each wheel to measure a wheel vertical acceleration, and a controller that estimates a road surface roughness based on the vehicle body corner vertical acceleration and the wheel vertical acceleration, determines a virtual tire damping required damping force based on the estimated road surface roughness, and adjusts a damping force of the variable damper based on the determined virtual tire damping required damping force.

A suspension device has an upper shell having a stepped section around an inner circumferential surface; a lower shell; a ball screw shaft rotatably supported by the upper shell; a bearing unit arranged between a part of the ball screw shaft and the upper shell, and having an outer side part in a radial direction including a side surface that comes in contact with a side surface on the other side in the axial direction of the stepped section; a ball nut screwed on the ball screw shaft; an inner tube joined to the lower shell and the ball nut; an electric motor; and a coil spring, and a circumscribed circle diameter of the ball nut and the inner tube is less than an inner diameter dimension of the stepped section.

Systems, computer-implemented methods, and computer program products relating to jerk of a vehicle damper are provided. According to an embodiment, a system can comprise a memory that stores computer executable components and a processor that executes the computer executable components stored in the memory. The computer executable components can comprise a control signal determination component that determines a new damping coefficient for a vehicle damper and determines a rate of change of acceleration from a current damping coefficient of the vehicle damper to a new damping coefficient for the vehicle damper, wherein the rate of change is based on a movement signal of the vehicle damper, and a damper adjustment component that adjusts to the new damping coefficient at the rate of change.

A damping control device for a vehicle calculates a combined control force by adding together a control force when a front wheel passes through a predicted passing position and a control force when a rear wheel passes through a predicted passing position, and calculates a final control force for the front wheel and a final control force for the rear wheel by distributing the combined control force at a predetermined distribution ratio.

A control unit is configured to execute vibration suppression control, in which the control force generation device is controlled based on a target vibration suppression control force when a wheel passes through a predicted wheel passage position, and roll control, in which the control force generation device is controlled based on a target roll control force for reducing roll of the sprung portion based on a roll index value. When the vibration suppression control and the roll control are executed concurrently, the control force generation device is controlled based on the target vibration suppression control force and the target roll control force obtained after at least one of a reduction correction for the target vibration suppression control force and an increase correction for the target roll control force is performed.

A damper assembly comprises a main tube extending along a center axis between a first end and a second end defining a fluid chamber. A main piston is disposed in the fluid chamber dividing the fluid chamber into a compression chamber and a rebound chamber. A piston rod extends along the center axis coupled to the main piston. An external tube extends about the main tube and defines a compensation chamber therebetween. The external tube includes a protrusion extending radially inwardly from an opened end to abut the main tube. An external piston is located in the compensation chamber and coupled to the main tube, dividing the compensation chamber into a first compartment and a second compartment. The first compartment extends between the protrusion and the external piston for containing a working fluid. The second compartment extends between the closed end and the external piston for containing a gas.

A rotary damper includes a rotating input member rotating about a rotation axis; a first cylinder and a second cylinder coaxially arranged on opposite sides of the rotation axis; a first and a second pistons slidable inside the first and second cylinders and defining a first and a second working chambers containing incompressible working fluids, respectively; motion conversion mechanisms converting the rotary motion of the rotating input member about the rotation axis into reciprocating motion of the first and second pistons; a third cylinder; a fourth cylinder; and a third and fourth pistons, slidable inside the third and fourth cylinders, respectively and separating the inner volume of the respective cylinder into a respective main chamber in fluid communication with the first working chamber and auxiliary chambers; and the second working chamber and auxiliary chambers respectively.

A first damping force generation mechanism provided in a first passage formed in a piston to generate a damping force, and a second damping force generation mechanism provided in an annular valve seat member disposed in one of chambers and provided in a second passage in parallel with the first passage to generate a damping force, in which the second damping force generation mechanism includes a first sub-valve provided on one side of the second passage formed in the valve seat member and a second sub-valve (provided on the other side thereof, and a bottomed cylindrical cap member having an outer cylindrical part and a bottom part, and the cap member includes an inner cylindrical part into which the piston rod is able to be inserted formed on an inner circumferential side of the bottom part and houses at least a part of the second damping force generation mechanism.

An electrically powered suspension system includes: an electromagnetic actuator provided between a vehicle body and a wheel of a vehicle and configured to generate a damping force for damping vibration of the vehicle body; a wheel speed sensor that detects a wheel speed of the wheel; a wheel speed variation amount calculation part that calculates a wheel speed variation amount on the basis of wheel speed detection values detected by the wheel speed sensor; a 3D gyro sensor that detects sprung state amounts including a sprung pitching action of the vehicle; and a wheel speed variation amount correction part that estimates a variation component in the wheel speed variation amount on the basis of a sprung pitch amount and corrects the wheel speed variation amount so as to reduce the estimated variation component.

Provided a suspension control apparatus including a vehicle behavior detection unit (acceleration sensors), an electrorheological damper provided between a vehicle body (1) and each wheel (2), and a controller configured to execute control so that a damping force of each electrorheological damper is adjusted based on a detection result obtained by the vehicle behavior detection unit. The controller includes a target voltage value setting unit (damping force command calculation unit) configured to obtain a target voltage value to be applied to an electrode tube based on the detection result obtained by the vehicle behavior detection unit, a temperature estimation unit configured to detect or estimate temperature of ERF, and a target voltage value correction unit (output limiting unit) configured to change the target voltage value so that a piston speed (V) is adjusted based on a value obtained by the temperature estimation unit.