Device for purifying exhaust gases from internal combustion engine

Patent · Tue Mar 04 04:00:00 EST 1980

OSTI ID:5593287

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

In a device for purifying the exhaust gases discharged from an internal combustion engine of the type having a secondary air supply pipe for charging the secondary air from an air source such as an air pump into an exhaust pipe upstream of an exhaust gas reactor or the like, a three-way valve is inserted in the supply pipe in such a manner that the three-way valve may be displaced between a first position at which the air source and the exhaust pipe are communicated with each other and a second position at which the communication between them is interrupted and the secondary air is relieved or returned to the air source bypassing the exhaust pipe; an air-fuel ratio sensor is inserted into the exhaust pipe downstream of the opening of the secondary air supply pipe into the exhaust pipe; and means for controlling the three-way valve is provided so that when the air-fuel ratio detected by the sensor is lower than a reference or optimum ratio at which the best performance of the reactor is expected the three-way valve is caused to move to the first position, whereas when the sensed air-fuel ratio exceeds the reference ratio, the three-way valve is caused to move to the second position, whereby the air-fuel ratio may be controlled with a higher degree of accuracy.

• Assignee: Nippon Soken Inc (Japan); Toyota Jidosha Kogyo K K (Japan)
• Patent Number(s): US 4191013
• OSTI ID: 5593287
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100 -- Internal Combustion Engines
330700* -- Advanced Propulsion Systems-- Emission Control
CATALYTIC CONVERTERS
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
PURIFICATION
VALVES
WASTES