A frequency-sensitive shock absorber according to an embodiment of the present disclosure includes a valve assembly configured to generate a damping force that varies depending on a magnitude of a frequency, in which the valve assembly includes a main retainer having a main chamber configured to communicate with an injection flow path formed in a piston rod or a body pin, a main valve configured to open or close the main chamber, a housing having a pilot chamber having one side facing the main valve and the other side communicating with the injection flow path, and a pilot valve configured to cover the pilot chamber and press the housing toward the main valve while being elastically deformed when pressure in the pilot chamber is higher than a preset pressure.

A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

A damping control system comprises a first vehicle, a second vehicle, and a storage device. The first vehicle provides, to the storage device, travel information including a change value of a road surface, position information, and position reliability of the position information. The storage device executes first update processing of updating related value information based on a road surface displacement-related value identified based on the change value, when the position reliability is equal to or higher than a threshold reliability, and executes second update processing of updating the related value information, when the position reliability is lower than the threshold reliability. The second vehicle executes preview damping control using a target control force calculated based on a control related value being a road surface displacement-related value at a predicted passing position.

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.

A shock absorber has a main piston and a compression piston, connected by a compression piston housing. In stage 1, the shock absorber operates as a conventional monotube, with the damping force being generated only by the main piston. In stage 2, the compression piston travels into the compression housing, as the shock absorber still operates as a monotube damper. In stage 3, the compression piston is now significantly increasing its compression damping force by supplementing the main piston. The oil volume in the compression piston housing passes through the compression piston, causing an increase in compression damping force.

The present disclosure relates to a vibration damper with adjustable damping force, comprising an inner cylinder with at least one working chamber which exhibits a flow connection to a damping-valve device, wherein the damper-valve device is arranged outside of an outer cylinder, wherein the flow connection has been realized in a component that is separate from the inner cylinder, wherein the separate component is constituted by a pressure-stage adapter which constitutes a part of the working chamber and which exhibits a coupling to the damping-valve device, wherein a base piece is arranged at the end of the inner cylinder, wherein the pressure-stage adapter and the base piece have been combined to form a pressure-stage adapter device.

A regenerative shock absorber that includes a housing and a piston that moves at least partially through the housing when the shock is compressed or extended from a rest position. When the piston moves, hydraulic fluid is pressurized and drives a hydraulic motor. The hydraulic motor, in turn, drives an electric generator that produced electric energy. The electric energy may be provided to a vehicle, among other things. The regenerative shock absorber may also provide ride performance that comparable to or exceeds that of conventional shock absorbers.

A roll vibration damping control system includes an electronic control unit configured to: compute a sum of a product of a roll moment of inertia and a roll angular acceleration of a vehicle body, a product of a roll damping coefficient and a first-order integral of the roll angular acceleration, and a product of an equivalent roll stiffness of the vehicle and a second-order integral of the roll angular acceleration, as a controlled roll moment to be applied to the vehicle body; compute a roll moment around a center of gravity of a sprung mass as a correction roll moment, the roll moment being generated by lateral force on wheels due to roll motion; and compute a target roll moment based on a value obtained by correcting the controlled roll moment with the correction roll moment.

A damping control device includes a control force generating device and a controller. The controller is configured to acquire road surface displacement related values related to a plurality of road surface displacements in a predetermined sampling zone, acquire an amplitude index indicating a magnitude of an amplitude of the sampled values, determine an operation delay period of the control force generating device based on the magnitude of the amplitude indicated by the amplitude index, calculate target control force for reducing vibration of a vehicle body based on the road surface displacement related values at a predicted passing position where a wheel is predicted to pass after an elapse of the operation delay period from a current time, and transmit, to the control force generating device, a control command for causing the control force generating device to regulate the control force to agree with the target control force.

This application provides a vehicle and a control method for a vehicle suspension. The vehicle includes a first component, a second component, and a vehicle suspension. The vehicle suspension is located between the first component and the second component. The first component is a component that the vehicle suspension bears, the second component is configured to bear the vehicle suspension and the first component, and the vehicle suspension includes a variable damper connected between the first component and the second component. The variable damper is configured to provide a first force to the first component based on a first acceleration of the first component, to control a displacement of the first component relative to the second component in a height direction of the vehicle. In the embodiments of this application, bumps in a driving process of the vehicle can be effectively reduced, so that vehicle ride comfort is improved.