Exhaust gas cleaning apparatus for an internal combustion engine

Patent · Tue Jul 31 04:00:00 EDT 1979

OSTI ID:6067241

Mitsuda, T; Yasuda, T; Fukumori, Y

Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter, an air-fuel ratio sensor and a secondary air injection system. The secondary air injection system has a diaphragm-operated flow control valve for increasing or decreasing the amount of secondary air introduced into the exhaust manifold of the engine in accordance with electrical signals transmitted from the air-fuel ratio sensor. Means are provided for rapidly increasing or decreasing the air-fuel ratio to a stoichiometric value at the moment when the amount of secondary air passed through the flow control valve is increased or decreased. Therefore, the air-fuel ratio is maintained quite near the stoichiometric value at which the three-way catalytic converter can effectively operate to clean the three major toxic components in the exhaust gas.

• Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
• Patent Number(s): US 4162612
• OSTI ID: 6067241
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
AUTOMOBILES
CATALYTIC CONVERTERS
DESIGN
EQUIPMENT
EXHAUST GASES
FUEL-AIR RATIO
GASEOUS WASTES
POLLUTION CONTROL EQUIPMENT
VEHICLES
WASTES