| 摘要 |
PURPOSE:To simplify the piping, by reducing the number of valves by constituting an idle-up valve disposed in a passage by-passing a throttle valve by a power-steering hydraulic valve and one solenoid valve. CONSTITUTION:One end of a hydraulic valve 8, which is opened when rising of the hydraulic pressure for actuating power steering is detected, is communicated with a solenoid valve 13 which communicates the upstream side and the downstream side of a throttle valve 4 disposed in an intake passage 3 of an engine. A control circuit 17 is connected to the solenoid valve 13 and various signals representing the operational conditions of the engine are applied to the control circuit 17. With such an arrangement, when idle-up is necessary, ports 14 and 15 are communicated with each other by opening the solenoid valve 13. Further, when the hydraulic valve 8 is opened with rising of the power-steering hydraulic pressure, intake air is by-passed via ports 14, 16. |
