EGR control unit and method for an internal combustion engine

Details EGR control unit and method for an internal combustion engine EGR control unit and method for an internal combustion engine

2006-09-12

2006-09-12

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C123S436000

Reexamination Certificate

active

07104260

ABSTRACT:
An EGR control method and unit for an internal combustion engine includes an EGR passage configured to recirculate a portion of an exhaust gas from an exhaust system to an intake system. An EGR valve, disposed in the EGR passage, is configured to control an amount of EGR, and an index calculator is configured to calculate a surge-increase index according to a variance in rotation of the engine. A detector is configured to compare the surge-increase index with a determination threshold to detect a surge increase, an adjuster is configured to adjust a correction value relative to a target amount of the EGR according to an output of the detector, and a target-amount calculator is configured to calculate the target amount of the EGR by subtracting the correction value from a reference target amount of the EGR determined based upon an engine operating condition.

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