On-board diagnostics for detecting the operation of diesel emissions control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 2, 2002
Grant Date -
N/A
app pub date -
Jul 20, 2000
filing date -
Jul 20, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An on-board diagnostic method for detecting whether a diesel emissions control system is functioning properly by continuously monitoring the temperature rise generated by the catalyst and the light-off temperature with reference to theoretical values stored in an engine control computer. When either of the parameters falls below a predetermined threshold value, the vehicle emissions may exceed emission standards and, if so, the system causes a malfunction indicator light (MIL) to be energize to advise the driver of the need for service.
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