Coordinated engine control for lean NOx trap regeneration

Details Coordinated engine control for lean NOx trap regeneration Coordinated engine control for lean NOx trap regeneration

2007-02-27

2007-02-27

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Methods

C060S278000, C060S286000, C060S295000, C060S297000, C123S295000, C123S305000

Reexamination Certificate

active

10812584

ABSTRACT:
A method for controlling a direct-injection gasoline engine during regeneration of a lean NOx trap disposed in an exhaust path of the engine includes determining the current air-fuel ratio and comparing the current air-fuel ratio to a lean limit air-fuel ratio. Transitions from lean stratified engine operation to rich homogenous engine operation are delayed until the current air-fuel ratio reaches the lean limit air-fuel ratio.

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