Onboard diagnostic monitoring for flexible fuel vehicles

Details Onboard diagnostic monitoring for flexible fuel vehicles Onboard diagnostic monitoring for flexible fuel vehicles

1998-10-14

2000-06-20

Dolinar, Andrew M.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

123479, 731173, 731181, F02D 4122, G01M 1500

Patent

active

060788615

ABSTRACT:
Onboard diagnostic monitors that are affected by a changing A/F activity resulting from fuel type mixture are disabled during such activity to avoid false malfunction diagnosis. A changing A/F is detected from the difference between a fast and a slow filtered value of an input signal from a fuel type sensor. If the difference value exceed a predetermined threshold, the monitors that are affected are disabled. After the A/F has stabilized, the filtered values converge and the monitoring is resumed.

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patent: 5467755 (1995-11-01), Konrad et al.
patent: 5671141 (1997-09-01), Smith et al.
patent: 5679890 (1997-10-01), Shinohara et al.

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