| 摘要 |
PURPOSE:To feed an appropriate mixture over an entire range of engine operation, by disposing solenoid control valves, respectively in passages communicating a diaphragm chamber in a variable venturi type carburettor with the atmosphere and an intake-air pipe. CONSTITUTION:A carburettor 1 having a variable venturi piston 2 is arranged such that the piston is moved up and down by controlling the vacuum in a chamber 3 above a diaphragm 12 to control the opening of a main jet 5 in order to supply an appropriate mixture. The vacuum of the chamber 3 is controlled by solenoid valves 6 one of which is disposed in a passage communicated with an atomspheric chamber 13 and the other one of which is disposed in a passage for introducing vacuum downstream of a throttle valve. Upon acceleration of the engine the piston 2 is moved upward by opening the vacuum passage to supply acceleration fuel, and upon deceleration the piston 2 is moved downward by opening the atmosphere passage to aim at reducing fuel. |
