| 摘要 |
<p>In an intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system, an electronic engine control module has a microprocessor programmed to perform selecting one of a first control mode in which an intake-air quantity of the engine is controlled by adjusting the throttle opening, and a second control mode in which an intake-air quantity of the engine is controlled by adjusting the intake-valve closure timing. The microprocessor is programmed to perform calculating a desired value of the intake-air quantity based on engine operating conditions, in accordance with a predetermined time-delay characteristic between initiation of adjustment of the throttle opening and an actual change in an internal pressure in the intake-air passage. The microprocessor is also programmed calculating a target throttle opening based on the operating conditions, and setting a target intake-valve closure timing at a basic intake-valve closure timing, when the first control mode is selected. Conversely when the second control mode is selected, by means of the microprocessor, the target throttle opening is set at a predetermined throttle opening, and the target intake-valve closure timing is calculated based on the desired value of the intake-air quantity. <IMAGE></p> |
