Exhaust gas control actuator

Patent · Tue Nov 11 00:00:00 EST 1980

OSTI ID:6510011

Motosugi, K; Sumiyoshi, M

An exhaust gas control actuator is described wherein the feed of secondary air fed to an exhaust piping is controlled by an oxygen concentration detector disposed in the stream of exhaust gas of an internal combustion engine and an air-fuel ratio of the exhaust gas entering a catalyst disposed downstream of the exhaust piping is maintained within a given range. The actuator comprises a flow control valve and a flow control device for controlling the flow control valve. The flow control valve is provided with a flow-in port communicated with an air pump and the valve body, a flow-out port communicated with an exhaust manifold and a bypass port communicated with an air cleaner. Furthermore, the flow control device is actuated by an electronic control circuit and comprises an actuating chamber partitioned by a diaphragm for actuating the valve body and including a negative pressure introducing port communicated with an intake manifold and an atmosphere introducing port constantly communicated with atmosphere, and a nozzle flapper mechanism provided in the actuating chamber and varying resistances to flow through the negative pressure introducing port and the atmosphere introducing port in accordance with the actuating position of the valve body in such a manner that an output signal of the oxygen concentration detector is negatively fed back to the feed of secondary air.

• Assignee: Toyota Jidosha Kogyo K K (Japan)
• Patent Number(s): US 4232517
• OSTI ID: 6510011
• Resource Relation: Patent Priority Date: Priority date 13 Mar 1978, Japan
• Country of Publication: United States
• Language: English

Related Subjects

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