Exhaust gas purification apparatus for an internal combustion engine

Patent · Tue Nov 27 04:00:00 EST 1979

OSTI ID:5485884

Katahira, E; Yamaguchi, S; Kida, M; Ishida, Y

A secondary air supply pipe line is opened in the exhaust pipe of an internal combustion engine on the upstream side of an exhaust gas reactor which is mounted in the exhaust pipe, and an air-fuel ratio sensor for detecting the air-fuel ratio of exhaust gases is mounted in the exhaust pipe on the downstream side of the portion where the secondary air supply pipe line is open. An air flow control valve for on-off controlling the flow of air in the secondary air supply pipe line is operated in accordance with the output signal of the air-fuel ratio sensor. When the air-fuel ratio of the exhaust gases is low the secondary air supply pipe line is fully opened by the air flow control valve in response to the output signal of the air-fuel ratio sensor, whereas when the air-fuel ratio for the exhaust gases is high the secondary air supply pipe line is fully closed by the air flow control valve in response to the output signal of the air-fuel ratio sensor, whereby maintaining the air-fuel ratio of exhaust gases supplied to the exhaust gas reactor at a predetermined value.

• Assignee: to Nippon Soken, Inc.
• Patent Number(s): US 4175386
• OSTI ID: 5485884
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330700 -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION ABATEMENT
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
FUEL-AIR RATIO
GASEOUS WASTES
INTERNAL COMBUSTION ENGINES
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
WASTES