Intake air amount control system for internal combustion engine

Details Intake air amount control system for internal combustion engine Intake air amount control system for internal combustion engine

2004-10-13

2009-08-04

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090160, C123S346000, C123S404000

Reexamination Certificate

active

07568454

ABSTRACT:
There is provided an intake air amount control system for an internal combustion engine, which controls the amount of intake air by executing both cam phase control and valve lift control, and is capable of enhancing response and accuracy of the intake air amount control, while avoiding interaction between the cam phase control and the valve lift control. In the intake air amount control system1, an ECU2controls the amount of intake air according to a target valve lift Liftin_cmd and a target cam phase Cain_cmd. The Liftin_cmd and Cain_cmd are respectively calculated as the sums of master values Liftin_cmd_ms and Cain_cmd_ms for causing an actual intake air amount Gcyl to converge to a target intake air amount Gcyl_cmd, and slave values Liftin_cmd_sl and Cain_cmd_sl set according to the master values Liftin_cmd_ms and Cain_cmd_ms (steps56and64). In a lift master mode, Cain_cmd_ms is set such that Cain_cmd_ms=0 holds (step63), and in a phase master mode, Liftin_cmd_ms is set such that Liftin_cmd_ms=0 holds (step55).

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