| 摘要 |
PURPOSE:To enable the atomization of fuel to be promoted, by restricting the full opening position of a throttle valve in a low speed region of an engine to be decreased smaller than the full opening position of the throttle valve in a high speed region of the engine so that an intake flow speed is increased when the engine is in low speed operation with an intake air quantity decreasing smaller. CONSTITUTION:In a throttle control device 20, when an engine speed is in a low speed region, a solenoid 34 is driven by a control circuit 36. If the electromagnetic solenoid 34 is placed in an on-condition, a link lever 35 is placed in a condition that it is attracted to a side of the solenoid 34. Consequently, when a throttle plate 23 is turned by depressing an accelerator pedal, the control device 20, in which the link lever 35 reaches the end edge of a slit hole 33 before a throttle valve 5 turns 90 deg. from its fully closed position, restricts a throttle shaft 21 from turning. In this way, in a low speed region, even if the accelerator pedal is supposed to be fully depressed, the throttle valve 5, which is not placed in its 90 deg. turned fully opening position, opens only to a slightly closed position.
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