Wheel suspension units each having fluid spring chambers are arranged in a vehicle suspension apparatus. A roll control quantity determined in accordance with the relationship between a vehicle velocity and a steering angular velocity, i.e., inlet solenoid valves and exhaust solenoid valves, are controlled in accordance with a solenoid ON/OFF time, thereby controlling the roll of a vehicle.

Vehicle suspension apparatus

A suspension control system employs a road sensor monitoring road roughness or smoothness and producing a road condition indicative signal The control system also employs other sensor or sensors for monitoring at least one preselected suspension control parameter, such as vehicle speed, steering angular variation and so forth, other than road roughness The suspension switches between relatively hard and relatively soft characteristics based on the preselected suspension control prameters In order to make suspension control more precisely suited to the vehicle driving conditions, the control characateristics of the suspension system are adjusted depending upon the road condition With this arrangement, even when the suspension is controlled so as to suppress vehicular roll based on the steering angular displacement and when rough road conditions cause steering angular displacement due to kick-back from the road input through the steering mechanism, the erroneous judgement that steering adjustments are about to cause vehicular roll can be avoided In case of acceleration responsive suspension control, rough road conditions tend to cause a driver to unconsciously operate the accelerator pedal so as to increase and decrease throttle valve angular position relative to the fully closed position According to the present invention, by adjusting the control characteristics, erroneous detection that the vehicle is accelerating, which would normally cause winding-up, can be successfully avoided

Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions

A vehicle suspension system using sensors and a computing means to vary suspension and road-handling parameters such as wheel camber, suspension spring rates, suspension damping coefficients, vehicle leveling and clearance to provide a vehicle with optimum suspension characteristics. This system is useful particularly, but not necessarily, for racing vehicles.

Computerized, central hydraulic, electronic variable suspension

A vehicle height control system includes a plurality of vehicle height adjusters actuated by a hydropneumatic actuating system and controlled by control signals from a control unit The control unit calculates, for each of the vehicle height adjusters, a target difference between a target adjustment position set by a setting device and an actual position detected by a vehicle height sensor associated with the adjuster, and the control unit generates the control signals in accordance with the respective target differences The control unit further selects a maximum target difference, and calculates deviations of the target differences from the maximum target difference When any of the deviations exceeds a predetermined value, the adjustment operation of the vehicle height adjuster associated with this deviation is temporarily stopped thereby correcting the nonuniformity of the adjustments in the vehicle height adjusters

Vehicle height control system

A vehicle height adjust control apparatus includes a plurality of actuators provided between a vehicle body and a plurality of wheels that are capable of changing a vehicle height at a wheel position corresponding to each of a plurality of wheels of the vehicle, a vehicle height detector that detects an actual vehicle height at different positions, a controller for controlling the actuators to eliminate deviations of each of the actual vehicle heights detected by the vehicle height detector from corresponding predetermined target vehicle heights and a simultaneous controller linked with the controller that simultaneously changes the actual vehicle height at individual wheel positions by controlling the actuators if the actual vehicle heights detected by the vehicle height detector are deviated from the corresponding target vehicle heights by at least a predetermined value toward the same side.

Vehicle height adjust control apparatus and method

A vehicle height adjusting apparatus includes a height adjustor receiving therein or exhausting therefrom pressurized air to adjust the height of a vehicle, an air compressor for supplying pressurized air to the height adjustor, a temperature detector for detecting the temperature of the air compressor, and a control device including an actuating circuit for operating the air compressor and a memory circuit receiving a signal from the temperature detector to stop the operation of the actuating circuit when the temperature detected by the temperature detector exceeds a predetermined level.

Vehicle height adjusting apparatus

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Vehicle height adjusting apparatus