Device for controlling internal combustion engine

Details Device for controlling internal combustion engine Device for controlling internal combustion engine

2006-06-13

2006-06-13

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S276000, C060S277000, C060S285000

Reexamination Certificate

active

07059120

ABSTRACT:
An upstream-side catalyst is arranged in an exhaust passage and a downstream-side catalyst is arranged in the exhaust passage downstream of the upstream-side catalyst. An air-fuel ratio sensor is attached for detecting the air-fuel ratio in the exhaust passage between the upstream-side catalyst and downstream-side catalyst. A representative upstream-side stored oxygen value OXU is calculated based on whether the control state of the engine is the “slight rich” control, “slight lean” control, fuel increase correction, or engine fuel cut and a representative downstream-side stored oxygen value OXD is calculated based on the engine control state and the output of the air-fuel ratio sensor. If the representative upstream-side stored oxygen value OXU or the representative downstream-side stored oxygen value OXD becomes smaller than the corresponding allowable lower limit LLU or LLD, “slight lean” control is performed, while if it becomes larger than the corresponding allowable upper limit ULU or ULD, “slight rich” control is performed.

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