Detection of cylinder-to-cylinder air/fuel imbalance

Details Detection of cylinder-to-cylinder air/fuel imbalance Detection of cylinder-to-cylinder air/fuel imbalance

2011-04-19

2011-04-19

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Fuel system or part thereof

Reexamination Certificate

active

07926330

ABSTRACT:
An air/fuel imbalance detection module includes a fueling control module, a response time determination module, and a comparison module. The fueling control module commands a fueling change according to a predetermined fueling pattern. The response time determination module determines a measured response time for a wide-range air/fuel sensor (WRAF) to output a predetermined voltage. The comparison module compares the measured response time with a reference time range and diagnoses air/fuel imbalance when the measured response time is outside the reference time range.

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