Idle speed control for lean burn engine with...

Details Idle speed control for lean burn engine with... Idle speed control for lean burn engine with...

2006-07-04

2006-07-04

Huynh, Hai (Department: 3747)

Internal-combustion engines

Engine speed regulator

Idle speed control

C123S399000, C123S481000, C123S436000

Reexamination Certificate

active

07069903

ABSTRACT:
A method is disclosed for controlling operation of a engine coupled to an exhaust treatment catalyst. Under predetermined conditions, the method operates an engine with a first group of cylinders combusting a lean air-fuel mixture and a second group of cylinders pumping air only (i.e. without fuel injection.) In addition, the engine control method also provides the following features in combination with the above-described split air/lean mode: auto speed control, sensor diagnostics, air-fuel ratio control, adaptive learning, fuel vapor purging, catalyst temperature estimation, and default operation. In addition, the engine control method also disables the split air/lean operating mode under preselected operating conditions.

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