| 摘要 |
PURPOSE:To construct a fuel pressure control device according to existing invention and enhance its reliability by introducing the suction pipe pressure downstream a throttle valve to a back pressure chamber via a pressure passage, and thereby ensuring that the suction pipe pressure is introduced to the back pressure chamber of a fuel pressure adjuster certainly at all times. CONSTITUTION:No.1 pressure passage 23 bored in a throttle body 14 is coupled with an opening 34 in a suction manifold 18. To a back pressure chamber 41, therefore, a suction pipe pressure downstream a throttle valve 16 introduced via an opening 38, No.2 pressure passage 25, No.1 pressure passage 23, and another opening 34. As pressure passages 23, 25 for leading the suction pipe pressure to the back pressure chamber 41 are formed in this manner in a housing on the suction system, a pressure pipe or rubber tube provided conventionally for the suction pipe pressure is no more needed, and also its connecting works are eliminated in the engine assembly process. Accordingly there is no risk of leaving tube, etc., out of connection or its removal under operation of the engine, to lead to enhancement of the reliability of the device concerned. |
