A method for operating a damper valve in order to control a damper force of a damper in an active chassis of a vehicle, wherein the damper valve includes a pilot valve for controlling a main spool. The method includes determining a target pressure necessary for a target damper force, in a first damper chamber of the damper; determining a valve flow through a damper valve inlet of the damper valve on the basis of a damper flow, generated by a damper movement, from the first damper chamber and on the basis of a measured pump flow of a pump; determining a main spool opening distance in such a way that, with an applied main spool flow through the main spool opening distance, the target pressure is present as the back pressure in the first damper chamber.

A method for controlling vehicle motion is described. The method includes accessing a set of control signals including a measured vehicle speed value associated with a movement of a vehicle. A control signal associated with user-induced input is also accessed. The method compares the measured vehicle speed value with a predetermined vehicle speed threshold value to achieve a speed value threshold approach status, and then compares the set of values to achieve a user-induced input threshold value approach status. The method monitors a state of a valve within the vehicle suspension damper, and determines a control mode for the vehicle suspension damper. The method also regulates damping forces within the vehicle suspension damper.

A suspension device includes a damper, a pump, an accumulator, a hydraulic pressure circuit disposed between the pump and the accumulator, and the damper configured to adjust a thrust of the damper, a blow flow passage connecting the accumulator to a reservoir, and a relief valve disposed in the blow flow passage and opening when the relief valve reaches a relief pressure to allow a flow from the accumulator side to the reservoir side.

A suspension device includes: a damper that has an extension-side chamber and a contraction-side chamber; an extension-side passage connected to the extension-side chamber; a contraction-side passage connected to the contraction-side chamber; a switching device that connects one of the extension-side passage and the contraction-side passage to the supply passage and connecting the other of the extension-side passage and the contraction-side passage to the discharge passage selectively; an extension-side damping element provided in the extension-side passage; a contraction-side damping element provided in the contraction-side passage; a control valve capable of adjusting a pressure in the supply passage; an intake check valve provided midway in the intake passage; and a supply-side check valve provided in the supply passage between the control valve and the pump.

A reaction force adjustment support device includes: a pressure data storage unit storing pressure data of respective spring chambers; a graphic user interface unit displaying a display screen; a reaction force calculator calculating reaction force data by using the pressure data of the respective spring chambers stored in the pressure data storage unit; a graph generating unit generating a graph of reaction force characteristics by using the reaction force data calculated by the reaction force calculator; and a controller displaying a screen for adjusting a reaction force where the screen has an operation portion for adjusting spring pressures provided for the respective spring chambers and a drawing area of the graph on the display screen, and controlling the reaction force calculator and the graph generating unit by user's operation with respect to the operation portion with the pressure data changed for the respective spring chambers to vary the graph.

A method for controlling vehicle motion is described. The method includes accessing a set of control signals including a measured vehicle speed value associated with a movement of a vehicle. A control signal associated with user-induced input is also accessed. The method compares the measured vehicle speed value with a predetermined vehicle speed threshold value to achieve a speed value threshold approach status, and then compares the set of values to achieve a user-induced input threshold value approach status. The method monitors a state of a valve within the vehicle suspension damper, and determines a control mode for the vehicle suspension damper. The method also regulates damping forces within the vehicle suspension damper.

A regenerative shock absorber that include 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.

An electronic external bypass for a shock assembly is disclosed herein. The electronic external bypass has a compression side fluid connection, a rebound side fluid connection, and an external bypass fluid flow path physically separate from the shock assembly, the external bypass fluid flow path fluidly coupling the compression side fluid connection with the rebound side fluid connection. The electronic external bypass includes a solenoid circuit, the solenoid circuit to control a flow of a working fluid through the external bypass fluid flow path, the solenoid circuit includes a poppet valve and an active valve configured to control a pop pressure of the poppet valve, such that the solenoid circuit provides an infinitely adjustable bypass pressure for the shock assembly.

At least one controller configured to control an actuator of an active suspension system. The at least one controller includes circuitry configured to determine an actuator state, and apply the actuator state and a commanded state to an inverse model of the actuator to produce an actuator command. The circuitry is configured to produce the actuator command by a process that includes performing low pass filtering and phase compensation to correct a phase introduced by the low pass filtering.

A hydraulic suspension system includes a suspension cylinder, a pump, and a control valve therebetween. The control valve includes a spool reciprocally movable between a pump flow position and a tank flow position in which a control port of the control valve is in communication with a pump and a tank, respectively. A piloted logic element in fluid communication with and interposed between the control valve and the suspension cylinder is selectively movable between a through-flow position in which fluid can flow in either direction between a chamber of the suspension cylinder and the control port of the control valve and a blocked position in which fluid is prevented from flowing in or out of the chamber of the suspension cylinder. The logic element is biased to the blocking position, moving to the through-flow position when subjected to a crack pressure delivered from the control port of the control valve.