Exhaust gas purification system for a diesel engine
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Dec 18, 1991
filing date -
Dec 26, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An exhaust gas purification system for a diesel engine 2 with a lean NOx catalyst 4 includes a temperature detecting means 6, an excess air ratio changing means 8 capable of changing an excess air ratio without changing a fuel injection amount, a control means for controlling the excess air ratio changing means 8 so as to increase the excess air ratio when the exhaust gas temperature is higher than an upper limit of a predetermined temperature range and to decrease the excess air ratio when the exhaust gas temperature is lower than a lower limit of a predetermined temperature range. In the exhaust gas purification system, the exhaust gas temperature can be controlled to the temperature range independently of the fuel injection amount.
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