Mitsubishi Denki K.k.

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Yoshihiro Tsuda

Shunichi Wada

Shigeki Ohtagaki

Kenji Hayase

A suspension control system having a suspension unit between a wheel and a body of a vehicle, a fluid supply device for supplying a fluid to the suspension unit, a fluid discharge device for discharging the fluid from the suspension unit, an amplitude measurement device for measuring the amplitude of vertical vibrations of the vehicle body, a threshold value setting device for setting a threshold value of the amplitude of vertical vibrations, a controller for cancelling expansion and contraction of the suspension unit by controlling the fluid supply and the fluid devices when the amplitude of vertical vibrations is equal to or larger than the threshold value, a counter for counting the number of times the fluid supply and fluid discharge devices are controlled by the controller in a predetermined time period, and a threshold value changing device for setting, when the number of times counted by the counter is equal to or larger than a reference number, the threshold value in the threshold value setting device to a value equal to or smaller than an upper limit but larger than a value to which the threshold value was set at a preceding time, and for setting the threshold value to a value equal to or larger than a lower limit but smaller than the value at the preceding time, when the counted number of times is smaller than the reference number.

Suspension control system using a variable threshold value to limit the

A suspension control system for enhancing the response characteristic of a vehicle body vibration suppressing control by lowering the spring constant or the damping force to a first desired level for both front and rear wheels at a time or only the rear wheel for a predetermined time in accordance with a differential value of an output signal from an acceleration detecting means in the vertical direction of the vehicle body, to thereby soften the shock of the vehicle body when the rear wheels get over a protuberance, and also by changing the spring constant or the damping force settled beforehand to a second desired level for both front and rear wheels at a time in case an unnecessary vibration of the vehicle body is detected afterwards. The second desired level is held for a predetermined time or continuously to suppress vertical vibrations of the vehicle body.

Suspension control system for enhancing response characteristics of a

A control apparatus which detects vertical and/or lateral vibrations of a vehicle body and controls, on the basis of amplitude and frequency of vibration, a characteristic of a support unit for supporting the vehicle body, such as, a damping force and a spring force of suspension or torsion quantity of a stabilizer. The control apparatus, when the detected vibration is high frequency vibration, obtains the frequency of vibration by a measured value of one cycle period, and, when the detected vibration is low frequency vibration, obtains the frequency of vibration by a measured value of a half cycle period.

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Himeji, Japan

Yoshihiro Tsuda