Emission control system with catalyst warm-up speeding control
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United States of America Patent
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May 31, 2005
Grant Date -
Apr 17, 2003
app pub date -
Oct 15, 2002
filing date -
Oct 16, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An emission control system has a catalyst and a sensor responding to a component of exhaust gas. In order to speed warming up the catalyst, the emission control system increases the amount of heat dissipated by exhaust gas. A diagnosis of the emission control system is carried out by determining whether the amount of heat dissipated by exhaust gas is sufficient or insufficient. The amount of heat dissipated by exhaust gas is represented by the length of time to an activated state of the sensor. In the diagnosis, the amount of heat generated by a heater provided in the sensor is taken into consideration.
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