Process for controlled injection of hydrocarbons into an exhaust line of an internal-combustion engine
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United States of America Patent
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Dec 11, 2001
Grant Date -
N/A
app pub date -
Apr 29, 1999
filing date -
Apr 29, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for controlled injection of hydrocarbons into an exhaust line of a lean-burn internal-combustion engine, comprising catalytic elimination of the nitrogen oxides. The process according to the invention consists in injecting a certain amount of hydrocarbons upstream from the catalytic elimination, periodically and for a short time interval, by means of pulsed hydrocarbon injections. The frequency and the amplitude of the hydrocarbon pulses are preferably controlled according to the running conditions of the engine.
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