| 摘要 |
PURPOSE:To control the idle rotation of an engine autmoatically to an optimum value with a deceleration negative pressure controller of a carburetor. CONSTITUTION:A deceleration negative pressure controller 5 includes a first diaphragm 6 operable in response to suction negative pressure in the downstream of a throttle valve, a negative pressure control valve 7 connected to the first diaphragm 6 and adapted to open when the suction negative pressure is raised beyond a predetermined level, a second diaphragm 8 operable in response to the suction negative pressure acting thereupon when the negative pressure control valve 7 opens, and a mixture valve 10. A magnet shut-off valve 26 is interposed intermediately in a control passage 21 and is operable in response to a signal sent from a car speed detector switch 28 to open the passage 21 when the car speed is lower than, for example, 15 Km/h thereby to bring a negative pressure chamber 14 to the atmospheric pressure to stop the operation of the deceleration negative pressure controller 5 in order to prevent a hunting phenomenon of the engine. |
