An active suspension system for a sprung mass that is supported and movable relative to an unsprung mass. The active suspension system has a suspension that comprises an electromagnetic actuator that is adapted to produce an arbitrary force on the sprung mass that is independent of the position, velocity and acceleration of the sprung mass, a control system that provides control signals that cause the suspension to exert force on the sprung mass, to control the position of the sprung mass relative to the unsprung mass, wherein the control system implements a control algorithm with one or more constants, and a user interface that is operable to cause a change of one or more of the control algorithm constants so as to vary how closely motion of the sprung mass follows motion of the unsprung mass.

Vehicle cab suspension control systems are disclosed herein. In some embodiments, the cab suspension control systems can include front cab-to-frame mounts that include controllable elastomer-based isolators that can provide real time variable damping to improve ride quality and/or road holding and reduce cab roll in response to, for example, input from one or more cab and/or frame mounted accelerometers, position sensors, etc. Embodiments of the control systems described herein can utilize a single vehicle controller (e.g., an ECU) to control all of the cab suspension components (e.g., semi-active damping technologies, air spring technologies, etc.) employed on a vehicle to provide a single suspension control solution that can provide improved ride performance, road holding, etc.

An active control system for a mass traveling along a guideway and method for active control of a mass traveling along a guideway. The active control system includes at least one displacement sensor and at least one motion sensor. Signals from the at least one displacement sensor and the least one motion sensor are processed to adjust a displacement of a reference location on the mass from a fixed reference.

An arrangement for a sensor system for vehicles, in particular motor vehicles, for detecting the vehicle speed, the vehicle level and/or the state of the vehicle suspension, having a sensor for measuring the level of a point on a vehicle body and a vibration damper, the vibration damper comprising a first part and a second part which are movable relative to each other, and wherein the level sensor has an excitation coil, at least one receiver coil and at least one electrically conductive element, wherein the excitation coil and the at least one receiver coil are arranged on the second part of the vibration damper and the electrically conductive element is arranged on the first part of the vibration damper or the first part comprises or forms the electrically conductive element.

A snowmobile has a rear suspension assembly including front and rear suspension arms, first and second rear shock absorbers, a first sensor for sensing an angular position of the front suspension arm, a second sensor for sensing an angular position of the rear suspension arm, and a controller communicatively connected to the first and second sensors. A method of controlling the rear suspension assembly includes: sensing an angular position and/or an angular velocity of the front suspension arm; sensing an angular position and/or an angular velocity of a rear suspension arm; and determining a stroke and/or a piston velocity of the first rear shock absorber and/or the second rear shock absorber based on the angular position and the angular velocity of the front and rear suspension arms as sensed by the first and second sensors respectively.

A damping force control device 10 comprises vary damping shock absorbers, a detector, and a controller. Each of the shock absorbers sets damping coefficient from a minimum value to a maximum value in order to adjust damping force. The detector detects vertical vibration state quantity relating to vibration of the sprung mass. The controller performs an ordinary control for setting the damping coefficient based on the vertical vibration state quantity and according to a predetermined control law suitable for an assumption that all of the wheels touch ground. The controller performs, when at least one of the wheels is an ungrounded wheel which does not touch the ground and each of the other wheels is a grounded wheel which touches the ground, a specific control for setting the damping coefficient of the shock absorber corresponding to the grounded wheel to a first specific value greater than the minimum value.

Suspension systems for recreational vehicles are disclosed. The suspension systems may include at least one adjustable member coupling a sway bar to respective suspensions. The suspension systems may include a torque actuator associated with a sway bar.

A method for controlling a vertical vibration damping of a wheel of a vehicle, in which the wheel has a suspension including a vibration damper with a control element including an actuating element for adapting a damping characteristic of the vibration damper includes a series of steps. The vehicle includes a first sensor for detecting roadway anomalies, a second sensor for detecting a vertical displacement of the wheel, and a control unit connected to the first and second sensors and the control element. The method steps include detecting roadway anomalies with the first sensor, detecting the vertical displacement with the second sensor and switching the vibration damper with the control element at a first point in time from a first state with a first damping characteristic into a second state with a second damping characteristic when a first sensor signal generated by the first sensor indicates a roadway anomaly with a minimum height.

In various embodiments, methods and systems for controlling a suspension system of a vehicle are provided. In one embodiment, a control system includes: one or more first sensors configured to measure a velocity of the vehicle; one or more second sensors configured to detecting one or more additional vehicles that ae moving in relation to the vehicle; and a processor that is coupled to the first sensors and the second sensors and that is configured to provide instructions for adjusting the suspension system of the vehicle, based on the measured velocity of the vehicle and the detected one or more additional vehicles that are moving in relation to the vehicle.

An apparatus for estimating vehicle weight using a vehicle height adjusting device is provided. The apparatus includes a vehicle height adjusting device that raises or lowers four positions of front left (FL) and right (FR) sides and rear left (RL) and right (RR) sides of a vehicle body, respectively. A vehicle height controller operates the vehicle height adjusting device to raise or lower the FL and FR sides and the RL and RR sides of the vehicle body. A weight estimating unit measures time required for raising or lowering the vehicle body or operating speed of the vehicle body and calculates an expected vehicle weight value by comparing the time required or the operating speed with a preset reference data.