PURPOSE: To make smooth the acceleration when abruptly opening the throttle valve, by making the difference between the open areas, between a valve for controlling the opening of the main air bleed path and a valve for controlling the opening of the slow air bleed path.
CONSTITUTION: The main nozzle tube 12a is coupled through a main air bleed path 18 with an electromagnetic valve 10. The slow fuel path 29b is opened through a fixed jet 19b to the atmosphere and through a slow bleed path 19 to an electromagnetic control valve 10. Said valve 10 is controlled by the signal 27 from an electronic unit 26. The relation between ineffective strokes l1 and l2 from the open state to the close state, in the first control valve V1 and the second control valve V2 in an electromagnetic control valve 10, is differentiated from l1>l2, to make a difference from the flows in the paths 18, 19, thereby it can be accelerated quickly even when the throttle valve is opened abruptly.
TANAHASHI TOSHIO
KATOU YOSHIROU
TOYOTA MOTOR CO LTD