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Title: Secondary air supply system for the exhaust system of an internal combustion engine

Abstract

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 eithermore » 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.« less

Inventors:
Publication Date:
OSTI Identifier:
5013110
Patent Number(s):
US 4211074
Assignee:
Toyota Jidosha Kogyo K K (Japan)
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 6 Feb 1978, Japan
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 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

Citation Formats

Hattori, K. Secondary air supply system for the exhaust system of an internal combustion engine. United States: N. p., 1980. Web.
Hattori, K. Secondary air supply system for the exhaust system of an internal combustion engine. United States.
Hattori, K. Tue . "Secondary air supply system for the exhaust system of an internal combustion engine". United States.
@article{osti_5013110,
title = {Secondary air supply system for the exhaust system of an internal combustion engine},
author = {Hattori, K},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5013110}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {7}
}