Method of operating a three-way catalyst for internal combustion engines

Patent · Tue Apr 29 04:00:00 EDT 1980

OSTI ID:5812671

Hattori, T; Kondo, K; Naito, J; Nakase, T

A method of operating a three-way catalyst which contains an oxygen storage material and which is mounted on the exhaust system of an internal combustion engine is disclosed. In order to operate the three-way catalyst effectively, the air-fuel ratio of the mixture supplied to the engine is set to be richer than the stoichiometric ratio, and secondary air is intermittently supplied by an air pump into the exhaust system upstream of the three-way catalyst, thereby to alternately vary the air-fuel ratio of the exhaust gases supplied to the three-way catalyst to become rich and lean with respect to the stoichiometric ratio.

• Assignee: Nippon Soken Inc (Japan)
• Patent Number(s): US 4199938
• OSTI ID: 5812671
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
CATALYSTS
CATALYTIC CONVERTERS
ENGINES
ENRICHMENT
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPERATION
OXYGEN ENRICHMENT
POLLUTION CONTROL EQUIPMENT
STOICHIOMETRY
WASTES