Air-fuel imbalance detection based on zero-phase filtering

Details Air-fuel imbalance detection based on zero-phase filtering Air-fuel imbalance detection based on zero-phase filtering

2011-03-08

2011-03-08

Huynh, Hai H (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C701S109000

Reexamination Certificate

active

07900615

ABSTRACT:
A control system comprising an oxygen sensor that generates an oxygen signal based on an oxygen concentration level in an exhaust gas of an engine, a filtering module that determines a filtered signal based on the oxygen signal, and an air-fuel imbalance detection module that detects an air-fuel imbalance in the engine based on the oxygen signal and the filtered signal. A method comprising generating an oxygen signal based on an oxygen concentration level in an exhaust gas of an engine, determining a filtered signal based on the oxygen signal, and detecting an air-fuel imbalance in the engine based on the oxygen signal and the filtered signal.

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