Exhaust gas purification system for internal combustion engine,

Details Exhaust gas purification system for internal combustion engine, Exhaust gas purification system for internal combustion engine,

1994-03-14

1996-05-28

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60284, 60289, F01N 320

Patent

active

055199925

ABSTRACT:
In an exhaust gas purification system for an internal combustion engine including a catalytic converter disposed in an exhaust pipe, an apparatus for controlling an amount and temperature of fresh air fed into the exhaust pipe so that optimal purification efficiency of the catalytic converter can realized. The apparatus includes an air pump for taking in fresh air, a control valve for controlling air flow, a heater for heating the air and the controller for controlling the pump, the valve and the hater in dependence on engine operation states so that nitrogen oxides, carbon monoxide and hydrocarbon contained in the exhaust gas can be removed to a maximum through reduction and oxidation reactions. An abnormality detecting device detects occurrence of abnormality in the air feeding control apparatus for ensuring fail-safe operation thereof.

REFERENCES:
patent: 3947544 (1976-03-01), Yamada et al.
patent: 3962867 (1976-06-01), Ikeura
patent: 3986352 (1976-10-01), Casey
patent: 4098078 (1978-07-01), Laurent
patent: 5060474 (1991-10-01), Aramaki
patent: 5097700 (1992-03-01), Nakane
patent: 5140810 (1992-08-01), Kuroda
U.S. Appln. SN 08/078,465 filed Jun. 18, 1993, GAU 3402.
U.S. Appln. SN 08/086,325 filed Jul. 6, 1993, GAU 3406.
"Electrically-Heated Catalyst System Conversions on Two Current-Technology Vehicles", Martin J. Heimrich et al, SAE Technical Paper Series, #910612, 1991.

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