| 摘要 |
PURPOSE:To make oil flow rate control characteristics selectable according to driver's preference, by installing a selecting device varying the circuit constant of a control circuit which performs such control as lessening an oil flow rate with increment of a car speed. CONSTITUTION:At the time of car driving, a car speed signal out of a car speed sensor 1 is fed to a solenoid drive circuit 4 via a voltage conversion circuit 2 and a smoothing amplification circuit 3. At this time, size of DC voltage to be secured out of the voltage conversion circuit 2 is the smaller, the larger in a car speed, while an oil flow rate to be fed to a power steering via a solenoid valve to be connected to output terminals SOL 1 and 2 is controlled to be large at low speed but small at high speed, respectively. The said oil flow rate is made being constant till it reaches the specified car speed V1, but this specified car speed V1 is made settable optionally by selecting a circuit constant of the voltage conversion circuit2, and selected with a characteristic select switch 9 turned on or off as well as a transistor 2q turned on or off. |
