| 摘要 |
PURPOSE:To keep the velocity of air flow constant irrespective of the opening of an auxiliary throttle valve disposed near a fuel nozzle and to prevent the auxiliary throttle valve from being opened and closed by vibration. CONSTITUTION:A processing circuit 22 for a hot-wire sensor 20 is fixed to a main body 10 in a unitary manner, and the output of the processing circuit 22 is afforded to a computor 26 fixed to a holder section 24. An auxiliary throttle valve 28 opened by the dynamic pressure of air flow is disposed in an intake passage 12 between a throttle valve 14 and a venturi portion 16, and a fuel injection unit 30 is disposed in a slot 28A formed in the auxiliary throttle valve 28. Further, a linkage fixed to the turning shaft of the auxiliary throttle valve 28 and consisting of an arm 103 to which an end portion of a straight rod 102 is connected in a freely rotatable manner is arranged such that the velocity of air flow at the fuel nozzle 30 is kept constant by detecting the pressure at the venturi portion 16 by means of a diaphragm 100. With such an arrangement, it is enabled to eliminate unstable fluctuation of air flow and to prevent unstable operation of the auxiliary valve 28. |
