Secondary air supply system for the exhaust system of an internal combustion engine
A description is given of a secondary air supply system for the exhaust system of an internal combustion engine, comprising a source of compressed air, an air control valve which supplies a part of the air delivered from the source to the exhaust system of the engine while relieving the rest of the air, an oxygen detector for detecting residual oxygen contained in the exhaust gases flowing through the exhaust system, a source of actuating fluid pressure, a change-over valve for actuating fluid pressure, and a controller which changes over the change-over valve in accordance with the output of the oxygen detector, said air control valve having an inlet port for receiving air from said source of compressed air, and outlet port for supplying a part of the air received to the exhaust system, a relief port for relieving the rest of the air received, a first passage which connects inlet port and outlet port, a second passage which connects inlet port and relief port, a first valve element which controls said first passage, a second valve element which controls said second passage, first second, and third diaphragm chambers, said first and second diaphragm chambers being reciprocally supplied with either actuating fluid pressure or atmosphere pressure by way of said change-over valve, a passage means including a throttling means and connecting said third diaphragm and one of first and second diaphragm chambers, at least one first diaphragm which defines first and second diaphragm chambers and is connected with said first valve element, a second diaphragm which defines said third diaphragm chamber and is connected with said second valve element, wherein said first diaphragm is adapted so as to shift said first valve element in the direction to increase the opening of said first passage when the fluid pressure in said first diaphragm chamber is lower than the fluid pressure in said second diapragm chamber.
- Assignee:
- Toyota Jidosha Kogyo K K (Japan)
- Patent Number(s):
- US 4211074
- OSTI ID:
- 5013110
- Resource Relation:
- Patent Priority Date: Priority date 6 Feb 1978, Japan
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exhaust gas recirculation control system
Pressure mediated diesel engine exhaust gas recirculation control system
Related Subjects
INTERNAL COMBUSTION ENGINES
EXHAUST SYSTEMS
FUEL-AIR RATIO
ACTUATORS
CATALYTIC CONVERTERS
COMPRESSED AIR
DETECTION
VALVES
AIR
COMPRESSED GASES
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUIDS
GASES
HEAT ENGINES
POLLUTION CONTROL EQUIPMENT
330700* - Advanced Propulsion Systems- Emission Control
330100 - Internal Combustion Engines