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,

1995-06-01

1996-05-21

Chilcot, Richard

Measuring and testing

Gas analysis

Gas of combustion

731181, B01D 5334

Patent

active

055178480

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: 5097700 (1992-03-01), Nakane
patent: 5214915 (1993-06-01), Schneider et al.
patent: 5219228 (1993-06-01), Ker et al.
patent: 5303580 (1994-04-01), Schneider et al.
patent: 5388454 (1995-02-01), Kuroda et al.
patent: 5408215 (1995-04-01), Hamburg
"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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