Catalytic converter system

Details Catalytic converter system Catalytic converter system

1993-05-17

1995-01-03

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

F01N 328

Patent

active

053774868

ABSTRACT:
An apparatus for controlling temperatures of catalytic converters in an exhaust system of an internal combustion engine. The exhaust system includes a light-off catalytic converter and a main, or underbody, catalytic converter. The light-off catalytic converter is smaller and is disposed nearer to the engine than is the main catalytic converter so that it can be brought to an efficient operating temperature by engine exhaust gases in less time than can the main catalytic converter. This reduces the output of initial undesirable exhaust emissions during start-up periods when the engine and exhaust system components are relatively cold. A valve controls the flow of exhaust gases through each of the two catalytic converters to bring them most quickly to, and maintain them at, their most efficient operating temperatures.

REFERENCES:
patent: 3440817 (1969-04-01), Saufferer
patent: 3791143 (1974-02-01), Keith
patent: 4817385 (1989-04-01), Kumagai
patent: 5058380 (1991-10-01), Pelters
patent: 5233830 (1993-08-01), Takeshima
Manual, 1993 Ranger/Explorer/Aerostar Powertrain/Drivetrain, Aug. 1992, p. 09-00-8.

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