| 摘要 |
PURPOSE:To make the control ability of a suspension unit satisfactory to enhance the drive feeling of a vehicle, by providing such a variable control of spring constant of the suspension unit that upon detection of running at a speed higher than a middle speed by a first vehicle speed sensor, when any one of detection signals of the other four kinds is detected, the spring constant is increased. CONSTITUTION:A G sensor 1 detects the acceleration G of vertical vibration of a vehicle body while an S sensor 2 detects the steering angle ISI and a B sensor 3 detects the turn-on or turn-off condition of a brake key switch. Further, a Vm sensor 4 is first detecting sensor for detecting the running condition of the vehicle at a speed higher than a middle speed. The output signal Vm from the Vm sensor 4 is turned into a signal having one value when it is higher than a predetermined value V1 which indicates a vehicle running condition at a speed higher than a middle speed, or having zero value when it is lower than the predetermined value, and is delivered to an AND circuit 12 together with a signal from an OR circuit 11. Further, the signal is delivered to an OR circuit 13, and an H-signal witch indicates that the spring constant is large is fed from the output terminal of the OR circuit 13 through a timer 15 to energize a solenoid 23 which closes passages 25, 26, thereby the spring constants of both fluid charged bushings 34, 43 are automatically controlled to be made large. |
