| 摘要 |
An intake air control system for a multi-cylinder reciprocating internal combustion engine. The intake system is comprised of a plurality of intake air passages which are respectively communicable with a plurality of combustion chambers each defined in each engine cylinder. A communication passage is contained with each intake air passage to establish communication between upstream and downstream sides of a throttle valve disposed in each intake air passageway. A bypass valve is disposed in each communication passage to control the flow amount of air flowing through the communication passage, in accordance with an output torque in each cylinder. The opening degree of the throttle valve is controlled in accordance with a target opening degree set in accordance with a depression angle of an accelerator pedal. The maximum value of opening degree of the throttle valve is restricted to the level of a limited maximum opening degree (set in accordance with engine speed) at which a pressure in the combustion chamber is approximately the maximum when an intake valve is closing, thereby suppressing the amount of air which reversely flows through the throttle valve.
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