Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Patent
1997-07-30
1999-08-24
Louis-Jacques, Jacques H.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
701109, 701103, 701102, 60274, 60276, 340439, 731181, F01M 300, F01N 320
Patent
active
059419180
ABSTRACT:
This invention pertains to a vehicular on-board diagnostic emission system in which the system determines whether the vehicle is continuously in compliance with regulatory emission standards by sensing only hydrocarbon and carbon monoxide emissions at a position downstream from the three way catalytic converter. All emission data sensed is correlated to a basic vehicle function, such as speed, and sorted into a number of histograms corresponding to vehicle operating conditions specified by emission regulations. The histograms are sampled in a statistically validated manner to determine if the vehicle complies with emission standards. If a failure has occurred, further histogram diagnostic routines are sequentially implemented to determine which emission system of the vehicle has failed.
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Engelhard Corporation
Louis-Jacques Jacques H.
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