Exhaust gas treatment for a two stroke engine
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United States of America Patent
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-
May 15, 1990
Grant Date -
N/A
app pub date -
Jul 5, 1989
filing date -
Sep 4, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A two-stroke spark ignited engine (10) with direct fuel injection (14) and an exhaust gas treatment catalyst. A separate catalyst unit (23) is provided for each combustion chamber (11) and is located at or adjacent each exhaust port (15) from that chamber and that during a cycle of each combustion chamber (11) the catalyst unit (23) of that combustion chamber (11) is exposed only to exhaust gases which change from chemically reducing to chemically oxidizing during the cycle. An engine which has exhaust gases which are overall chemically oxidizing can thus nevertheless have the NOx constituents of the gases reduced.
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