摘要:
In an electric control apparatus for a four-wheel steering system including an electric motor the rotary angle of which is electrically controlled in accordance with a target steering angle of rear road wheels, and a hydro-mechanical tracer mechanism having a fluid control valve the valve element of which is drivingly connected to the electric motor to be displaced in proportion to the rotary angle of the electric motor, the tracer mechanism being arranged to steer the rear road wheels in proportion to a displacement amount of the valve element, the target steering angle is converted into a control value for rotation of the electric motor, and a drive signal indicative of the control value is applied to the electric motor. The electric control apparatus is designed to greatly change the control value to and from zero when the target steering angle is less than a predetermined small angle and to change the control value in proportion to the target steering angle when the target steering angle is more than the predetermined small angle.
摘要:
An electric control apparatus for a four-wheel steering system is designed to calculate a rear wheel steering angle on a basis of a control rule corresponding with a steering mode selected from a plurality of rear wheel steering modes thereby to steer a set of dirigible rear road wheels at the calculated steering angle. The electric control apparatus is further designed to calculate a difference between new and old steering angles calculated when the selected steering mode has been changed to another one of the steering modes and immediately after change of the selected steering mode, to gradually decreasing an absolute value of the calculated difference at a predetermined time interval, to correct the new steering angle in accordance with the absolute value of the calculated difference until the absolute value becomes zero after change of the selected steering mode and to control an actual steering angle of the rear road wheels in accordance with the corrected new steering angle.
摘要:
In a hydraulic active suspension system, a plurality of actuators having working fluid chambers are provided corresponding to vehicle wheels. Each actuator is adapted to increase and decrease vehicle height as the results of the supply and the discharge of working fluid to and from its working fluid chamber, respectively. Supplying and discharging devices supply working fluid to and discharge from the working fluid chamber. Vehicle height sensors detect the vehicle heights at the locations corresponding to the vehicle wheels. A control device is further provided. The control device controls the supplying and discharging devices so that the pressure within the working fluid chamber in each actuator may be a value corresponding to the sum of a basic pressure determined according to the running conditions of the vehicle and a compensating pressure determined based upon the integral value of the difference between a standard vehicle height and an actual vehicle height. When the integral value of the difference is larger in magnitude than a predeterminate value, it is reduced in magnitude by the control device so as to prevent the control with the compensating pressure from overriding the control with the basic pressure.
摘要:
A suspension controller for a vehicle is provided to effectively absorb vibrations such as resonant vibration of the mass of the wheel when the wheel is not on the ground, namely, "resonant vibration of unsprung mass". The suspension controller includes: a vehicle height detection means at a front wheel; a vehicle height determination means for comparing the vehicle height with a predetermined reference value; a cycle time determination means for detecting the cycle time of the vehicle height signal and for comparing the detected cycle time with a predetermined reference value; a control means for generating a suspension characteristic alteration signal based upon the vehicle height determination result and the cycle time determination result; and a suspension characteristic alteration means for altering a suspension characteristic of the vehicle in response to the suspension characteristic alteration signal.
摘要:
A suspension controller is provided to effectively absorb a sporadic shock by appropriately altering a suspension characteristic. Especially, when a sporadic shock is detected, which is caused by riding-through a dip or riding-over a bump of the front wheels, the suspension controller of the invention can alter the rear suspension characteristic before the rear wheels ride through the dip or over the bump. The suspension controller of the invention particularly includes restoration means for restoring the altered suspension characteristic when a predetermined delay time interval has elapsed from a time point at which a vehicle height data was determined to be out of a predetermined range by determination means, and for starting the recount of the predetermined delay time interval if the vehicle height data is again determined to be out of the predetermined range by the determination means before the predetermined delay time interval elapses from the first determination.
摘要:
A new rear suspension controller is invented for improving a ride comfort or for improving controllability and stability when a vehicle passes a sporadic bump or dip of otherwise smooth road surface. It includes: a front vehicle height detector which measures a distance between the vehicle body and a front wheel; a first judgment means which detects a sporadic bump or dip by comparing the signal from the front vehicle height detector with a preset standard value; a rear vehicle height detector which measures a distance between the vehicle body and a rear wheel; a second judgment means which detects the bump or dip that the front wheel has passed; and a rear suspension characteristic alteration means which alters, for example, a spring constant of air suspensions, a dumping force of shock absorbers, stabilizer compliance, etc. when the first judgment means detected the bump or dip and returns the characteristic after the second judgment means judges that the rear wheel has passed it.
摘要:
An air suspension system which includes an air spring provided between a car body and a suspension arm for adjusting the car height by changing the volume of the air spring. The air spring includes a diaphragm and an air piston formed to contact with the diaphragm. The air piston has a plurality of wall portions arranged longitudinally. Each wall portion is different in its external shape from the portion adjacent thereto. The external shapes of the air piston includes a combination of at least two shapes of the group including a straight cylindrical shape, a tapered shape converging downward and a tapered shape diverging downward.
摘要:
A suspension controller of a vehicle having a suspension between a body and a wheel, includes: a vehicle height detection means for detecting a vehicle height at a front wheel and for generating a vehicle height signal according to the detected height; a determination means for receiving the vehicle height signal, and for generating height data responsive to the vehicle height signal, for determining whether the difference between the maximum and the minimum value of the height data during a predetermined period is greater than a reference value, the period being determined within a cycle time of sprung mass vibration, and for generating a suspension control signal, and a suspension characteristic alteration means for altering characteristics of the suspension in response to the suspension control signal.
摘要:
A near rear suspension controller for a vehicle having a suspension between a vehicle body and a rear wheel includes: a front height detection section for measuring a distance between the vehicle body and a front wheel for generating a front height signal; a judgement section for generating a judgment result signal when the front height signal exceeds a predetermined range; and a rear height control section for increasing the rear vehicle height when it receives the judgment result signal.
摘要:
According to the present invention, as soon as the sporadic protrusion or sinking of a road surface is detected at the front wheel of the vehicle during its running on the road surface, the air chambers of the air suspensions for the right and the left rear wheels of the vehicle are connected to each other to alter the spring constant of the rear suspensions to `soft` when the rear wheel passes over the sporadic protrusion or sinking of the road surface, so that the feel of ride of the vehicle and the controllability and stability thereof are kept good. After the rear wheel moves over the sporadic protrusion or sinking, the characteristic of the rear suspensions is returned to the original state appropriate to the normal running state of the vehicle. Detectors for the sporadic protrusion or sinking of the road surface may be provided for the right and the left front wheels of the vehicle, respectively. The rear suspensions of the vehicle can be more appropriately controlled by that.