Measuring and testing – Gas analysis – Gas of combustion
Patent
1998-04-23
2000-05-30
Williams, Hezron
Measuring and testing
Gas analysis
Gas of combustion
731173, 204424, 123688, G01N 700, G01N 2726, G01L 326, F02D 4100
Patent
active
060678410
ABSTRACT:
A method that detects an air-fuel ratio in each cylinder of an internal combustion engine by properly setting a cycle of detecting an element resistance of an A/F oxygen concentration sensor. Although an actual A/F signal is at the stoichiometric ratio in each cylinder at exhaust timing cycle in a practical engine rotational speed range, the ratio is largely deviated to the rich side in the #1 cylinder. The first element resistance detection timing cycle coincides with generation timing of the actual A/F signal, so that the A/F signal cannot be detected. When the element resistance detection timing cycle is preset so as to be longer than the exhaust timing cycle, the second actual A/F signal detection timing for the #1 cylinder does not coincide with the element resistance detection timing. Consequently, the actual A/F signal of the #1 cylinder can be detected as an A/F signal by the A/F sensor.
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Hada Satoshi
Haseda Satoshi
Kurokawa Eiichi
Suzuki Norio
Suzuki Toshiyuki
Denso Corporation
Honda Giken Kogyo Kabushiki Kaisha
Politzer Jay L.
Williams Hezron
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