Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1992-09-21
1995-01-10
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60286, 60289, 60297, 60311, F01N 322, F01N 320
Patent
active
053795865
ABSTRACT:
An exhaust gas cleaning system has a catalyzer provided in the exhaust passage of the engine and an adsorbent provided upstream from the catalyzer. The adsorbent temporarily adsorbs unburned hydrocarbons emitted in large amounts immediately after the engine is started. The system provides an amount of air required to substantially eliminate unburned hydrocarbons, based on the temperature of the adsorbent and the oxygen concentration in exhaust gas upstream from the catalyzer. An air supplying unit is provided upstream from the adsorbent. A temperature sensor is provided for the adsorbent. An oxygen sensor is provided at the inlet of the catalyzer. A control unit calculates the amount of air (oxygen) necessary for the catalyzer to convert the unburned hydrocarbons released from the adsorbent, based on signals from the temperature sensor and the oxygen sensor and the exhaust flow rate. The control unit accordingly controls the air supplying unit.
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Fujishita Masakatsu
Honji Akio
Kuroda Osamu
Miyadera Hiroshi
Ogawa Toshio
Heyman L.
Hitachi , Ltd.
Lazarus Ira S.
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