Idle speed control apparatus for internal combustion engine
AssigneesToyota Jidosha Kabushiki Kaisha, Denso Corporation
InventorsNaohide Fuwa, Hisayo Yoshikawa
Life of this patent
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Abstract
When it is determined that an engine speed NE rapidly decreases (positive outcome at S210), a throttle increase amount TAu and a valve lift increase amount VLu are computed based on a decrease rate NEd of the engine speed NE (S220). Then, a target throttle opening degree TAt of a throttle valve and a target maximum valve lift VLt of an intake valve are increased by using the throttle increase amount TAu and the valve lift increase amount VLu (S230). As a result, a drop in the engine speed during idling is reliably suppressed.
Claims12
An apparatus for controlling a speed of an internal combustion engine during idling to be a target engine speed, the engine including a valve actuation parameter adjustment mechanism capable of changing an intake valve actuation parameter that is a valve opening period and a valve lift of an intake valve, and an intake air amount control valve located in a section upstream of the intake valve, the apparatus comprising:
- a changing section that, when the engine speed during idling rapidly decreases, changes the intake valve actuation parameter and a control valve opening degree, which is an opening degree of the intake air amount control valve, such that an intake air amount is increased.
Dependencies are inferred from the claim text.