Apparatus system and method for measuring a normalized...

Details Apparatus system and method for measuring a normalized... Apparatus system and method for measuring a normalized...

2006-03-20

2010-02-23

Cronin, Stephen K (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

Reexamination Certificate

active

07665444

ABSTRACT:
An apparatus, system, and method are disclosed for measuring a normalized air-to-fuel ratio. A normalized air-to-fuel ratio is measured by providing an engine control module, providing a first wide-band oxygen sensor in fluid communication with an exhaust stream, adjusting the oxygen pumping current to achieve a stoichiometric balance, detecting the oxygen pumping current, converting the oxygen pumping current to an oxygen balance metric, and communicating the oxygen balance metric to the engine control module. In certain embodiments, the oxygen balance metric may be a volumetric oxygen percentage. In some embodiments, the present invention includes a first and second wide-band oxygen sensor upstream and downstream from an exhaust treatment module.

REFERENCES:
patent: 6663424 (2003-12-01), Wyse et al.
patent: 6681752 (2004-01-01), Kreikemeier et al.
patent: 2006/0289314 (2006-12-01), Schnaibel et al.
patent: 2007/0246358 (2007-10-01), Schneider et al.
patent: 2328459 (1975-01-01), None

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