Abstract: A vehicle rear wheels steering apparatus is provided with a guide member having a guideway capable of freely tilting toward the axis of the rod member. Therefore, when the rod member rotates around the axis, an operating member provided on the outside of the rod member rotates around the rod member axis along the guideway to steer the rear wheels by an amount corresponding to an amount of rotation of the rod member and an amount of tilting of the guideway.

Abstract: A rear wheel steering apparatus for a vehicle, comprises a hydraulic cylinder for displacing a steering rod connected to left and right rear wheels axially, a centering spring for biasing the steering rod toward a neutral position, and a centering spring cancelling mechanism for preventing a biasing force of the centering spring from acting on the steering rod. A partition wall of the hydraulic cylinder defines an oil chamber in the cylinder and is formed as a cup shape having a central concave portion which constitutes a pressure chamber of the centering spring cancelling mechanism.

Abstract: A rear wheel turning system for a four-wheel steered vehicle includes a rear wheel turning mechanism for turning the rear wheels of the vehicle, a front wheel turning angle sensor which detects a turning angle of front wheels .theta..sub.F, a vehicle speed sensor which detects a vehicle speed V, a yaw rate detector which detects a yaw rate .PSI. of the vehicle, a yaw acceleration detector which detects a yaw acceleration .PSI. of the vehicle, and a control unit which causes the rear wheel turning mechanism to turn the rear wheels by a target rear wheel turning angle TG.theta..sub.R which is defined by formulaTG.theta..sub.R =-K.sub.1 .theta..sub.F +K.sub.2 .multidot.V.multidot..PSI.+K.sub.3 .multidot.V.multidot..PSI.wherein K.sub.1, K.sub.2 and K.sub.3 respectively represent positive coefficients. The coefficient K.sub.3 is increased with increase in the vehicle speed V over a predetermined range of vehicle speed where the coefficient K.sub.2 is constant.

Abstract: A suspension apparatus of a vehicle has a liquid cylinder disposed between a member on the side of a vehicle body and a member on the side of each wheel so as to alter a suspension characteristic by controlling the supply and discharge of an operating liquid to and from the liquid cylinder. The gain of the control amount in a high-frequency region for supplying or discharging the operating liquid to or from the operating liquid is reduced by a low pass filter. The time constant of the low pass filter is so arranged as to become larger as the control amount gets larger.

Abstract: A fluid cylinder unit is disposed between a vehicle body and each of wheels and suspension characteristics are changed by changing the control amount of operating fluid to be supplied to or discharged from the fluid cylinder. The control amount is given based on predetermined conditions using the traveling state of the vehicle such as vehicle height, velocity of displacing the vehicle height and vertical acceleration as a parameter. A filter causes a gain of the control amount to be reduced as the frequency of vibration gets larger. A time constant of the filter is so set to become larger as the operated control amount gets larger when the control amount is smaller than a predetermined value, while the time constant is set to the predetermined value when the control amount is equal to or larger than the predetermined value. Specifically, the control amount Q is determined by the following formula: Q=Qc/(1+k.times.Qo.times.

Abstract: A suspension apparatus of an automotive vehicle controls a posture of the vehicle body by controlling supply and discharge of an operating liquid to and from a cylinder unit interposed at each of the wheels between a sprung weight and an unsprung weight. The pressure within a high-pressure line for supplying the operating liquid of a high pressure to the cylinder units is released to the reservoir tank at a faster speed when a trouble occurs which cannot normally perform a control of the posture of the vehicle body and at a slower speed when an ignition switch has been turned off.

Abstract: A vehicle suspension system has liquid pressure cylinder devices provided between the respective wheels and the vehicle body. Supply and discharge of hydraulic liquid to and from the liquid pressure cylinder devices is controlled according to the running condition of the vehicle. Each of the liquid pressure cylinder devices communicates with a pair of gas springs, each having a gas chamber and a liquid chamber parted from each other by a movable member. The liquid chamber communicates with the liquid pressure chamber of the liquid pressure cylinder device by way of a communicating passage, and the gas chamber is filled with gas. The initial pressure of one of the gas springs is higher than that of the other.

Abstract: A vehicle control system includes an active suspension mechanism for providing a rolling property of a vehicle in a cornering operation of the vehicle and a suspension control device for controlling the vehicle in accordance with the rolling property provided by the active suspension mechanism and changing from one rolling property to another. A rear wheel steering mechanism steers a rear wheel in connection with steering of a front wheel, and a steering control device controls the steering of the rear wheel in accordance with a predetermined steering property and changes the steering property for the rear wheel. One of the steering property and the rolling property is changed in synchronism with a change in the other of the steering property and the rolling property.

Abstract: Among two damping devices arranged in series between wheel side members and body side members, while in one damping device spring constant of a spring member is set low and damping coefficient of a damper member is set high, in the other damping device spring constant of a spring member is set high and damping coefficient of a damper member is set low. By this arrangement, difference in damping force between the area of low oscillation frequency and the area of high oscillation frequency can be made large, whereby running stability and comfortableness to ride in can be improved on a high level.

Abstract: A vehicle suspension system of the disclosure is provided with a cylinder device between a vehicle body member and a vehicle wheel member for the vehicle body member by which suspension characteristics are changed. The suspension characteristics are changed by controlling hydraulic fluid supply for the cylinder device, a vehicle height detecting device for detecting a vehicle height displacement, a vehicle height change rate detecting device for detecting a change rate of the vehicle height displacement, and a control device for receiving signals from both the vehicle height displacement detecting device and the vehicle height change rate detecting device to control the hydraulic fluid supply for the cylinder device.

Abstract: A vehicle suspension system includes a cylinder device, provided between a vehicle body member and a vehicle wheel member for the vehicle body member, in which suspension characteristics are changed by controlling hydraulic fluid supply for the cylinder device. A vehicle height displacement detecting device detects a vehicle height displacement, and a vehicle height control device receives a signal from the vehicle height displacement detecting device to control the hydraulic fluid supply for the cylinder device to thereby obtain a target vehicle height displacement in accordance with a height control sensitivity. A sensitivity change device changes the height control sensitivity in accordance with a predetermined condition so as to change the supply of the hydraulic fluid for the cylinder device. A warp control cooperate and a height control are optimized.

Abstract: A suspension apparatus of a vehicle has a cylinder unit interposed between a sprang weight and an unsprung weight, which changes a ride height of the vehicle body by supplying or discharging an operating liquid through a supply/discharge control valve. The supply/discharge control valve is controlled on the basis of a predetermined condition so as to control a posture of the vehicle body. There are further provided a rebound detecting means for detecting a rebound of each of the wheels and a pressure detecting means for detecting a pressure in the cylinder unit. When the rebound is detected by the rebound detecting sensor to be above a given value, if the pressure detected by the pressure detecting means is continued at a magnitude above a given value for a given period of time, it is judged that the supply/discharge control valve is in trouble.

Abstract: A suspension apparatus of a vehicle has a cylinder unit interposed between a sprang weight and an unsprung weight, which changes a ride height of the vehicle body by supplying or discharging an operating liquid through a supply/discharge control valve. The supply/discharge control value is controlled on the basis of a predetermined condition so as to control a posture of the vehicle body. There are further provided a rebound detecting sensor for detecting a rebound of each of the wheels, which occurs further from a state in which the wheel is rebounded, and a pressure detecting sensor for detecting a pressure in the cylinder unit. When it is sensed by the rebound detecting sensor that the rebound occurs further from the rebounding state, if the pressure detected by the pressure detecting sensor is continued in an elevating state for a given period of time, it is judged that the supply/discharge control valve is in trouble.

Abstract: A suspension apparatus of a vehicle has a cylinder unit interposed between a sprang weight and an unsprung weight, which changes a ride height of the vehicle body by supplying or discharging an operating liquid through a supply/discharge control valve. The supply/discharge control value is controlled on the basis of a predetermined condition so as to control a posture of the vehicle body. There are further provided a bump detecting sensor for detecting a bump of each of the wheels, which occurs further from a state in which the wheel is bumped, and a pressure detecting sensor for detecting a pressure in the cylinder unit. When it is sensed by the bump detecting sensor that the bump occurs further from the bumping state, if the pressure detected by the pressure detecting sensor is continued in a lowering state for a given period of time, it is judged that the supply/discharge control valve is in trouble.

Abstract: A suspension apparatus of a vehicle has a cylinder unit interposed between a sprang weight and an unsprung weight, which changes a ride height of the vehicle body by supplying or discharging an operating liquid through a supply/discharge control valve. The supply/discharge control value is controlled on the basis of a predetermined condition so as to control a posture of the vehicle body. There are further provided a bump detecting means for detecting a bump of each of the wheels and a pressure detecting means for detecting a pressure in the cylinder unit. When the bump is detected by the bump detecting sensor to be below a given value, if the pressure detected by the pressure detecting means is continued at a magnitude above a given value for a given period of time, it is judged that the supply/discharge control valve is in trouble.

Abstract: A suspension system for a vehicle has cylinder devices, in which suspension characteristics are changed by controlling fluid supply or discharge to or from the cylinder devices. In the suspension system, after sensing a vehicle height displacement, the fluid supply or discharge to or from the cylinder devices is controlled so as to set the vehicle height displacement to a desired value in a vehicle height displacement control. Also, the fluid pressure in the cylinder, devices is sensed, and a warping of the vehicle body is computed, based on sensed pressures. Then, fluid supply or discharge to or from the cylinder devices is controlled so as to suppress the warping of the vehicle body in a warp control. According to predetermined conditions, a warp gain coefficient in a warp control unit is changed, so that the vehicle height displacement control and the warp control are performed optimally.

Abstract: A vehicle suspension system includes a cylinder device provided between a vehicle body member and a vehicle wheel member for the vehicle body member in which suspension characteristics are changed by controlling a hydraulic fluid supply for the cylinder device. A pressure detector detects a hydraulic pressure of the cylinder device for each of the vehicle wheel members, and a warp control unit computes a warping of vehicle body so as to control a hydraulic fluid supply for the cylinder device in a manner such that the warp of the vehicle body is suppressed.

Abstract: This invention discloses a control system for integrally controlling steering and a power unit of a vehicle includes: a front-wheel steering device for steering the front wheels of the vehicle in connection with the operation of a steering handle; a rear-wheel turning device for turning the rear wheels of the vehicle in connection with steering of the front wheels; an adjustment device for adjusting an engine output of the vehicle; a first detection device for detecting an amount in which an accelerator member is operated; a driving device for driving the engine output adjustment device in response to the amount in which the accelerator member is operated; a second detection device for detecting either an instruction given by a driver who wants to change a travel characteristic or changes in an environment in which the vehicle is running; and a change/correction device for changing or correcting a control characteristic which controls the rear-wheel turning device and the driving device in response to an outp

Abstract: A suspension-steering control apparatus is provided with suspension-characteristic changing means for changing a suspension characteristic and a rear-wheel steering mechanism for steering rear wheels of a vehicle. The suspension characteristics is such that, for example, a magnitude of a damping force of a suspension or a rolling rigidity ratio of the rear portion of the vehicle body to the front portion thereof can be changed. The rear-wheel steering mechanism is controlled on the basis of a predetermined steering characteristic. The steering-characteristic is corrected in synchronization with alteration of the suspension characteristic.

Abstract: A hydropneumatic suspension system for a vehicle has a hydraulic cylinder-piston device connected between the vehicle body and each of the wheels, and a plurality of gas springs which exert a spring force according to the hydraulic pressure in the hydraulic chamber of the cylinder-piston device. Each gas spring has a fluid chamber and a gas chamber which are defined in a casing and are separated from each other by a movable partition wall, and the fluid chamber is communicated with the hydraulic chamber of the hydraulic cylinder-piston device. The upper end portion of the piston rod is supported by the vehicle body by way of a mount. The piston rod is provided with a fluid passage which axially extends through the piston rod and the lower end of which opens to the hydraulic chamber of the cylinder-piston device. A support member is fixed to the piston rod at an upper portion below the mount.