US4104879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary air supply system for an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1976-04-22
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Granted: 1978-08-08
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Expires: 1996-04-22
Abstract
Abstract A system for supplying secondary air into an exhaust system of an internal combustion engine in a manner such that the amount of secondary air is proportional to the engine intake air. The supply of the secondary air is controlled by a valve member which is biased in response to a balance between a venturi vacuum and the exhaust gas pressure until a predetermined ratio of the venturi vacuum to the exhaust gas is obtained.
Inventors
- 👤 Hidetaka Nohira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:21
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A system for supplying secondary air into an exhaust system of an internal combustion engine by a flow rate substantially proportional to that of exhaust gases, comprising: a source of secondary air; a passage means for conducting secondary air from said source to said exhaust system of the engine; a secondary air control valve provided in the midst of said passage means for controlling the supply of secondary air to said exhaust system depending upon a control signal pressure supplied thereto; a pressure regulating valve for regulating the pressure of said control signal pressure; said pressure regulating valve having a valve member; and means positioning said valve member in accordance with a balance between a pressure representative of a carburetor venturi vacuum and the exhaust gas pressure of the engine.
Claim 2
Independent Claim
130 words
A system for supplying secondary air into an exhaust system of an internal combustion engine by a flow rate substantially proportional to that of exhaust gases, comprising: a source of secondary air; a passage means for conducting secondary air from said source to said exhaust system of the engine; a secondary air control valve provided in the midst of said passage means for controlling the supply of secondary air to said exhaust system depending upon a control signal pressure supplied thereto; a pressure regulating valve for regulating the pressure of said control signal pressure; said pressure regulating valve having a valve member; and means positioning said valve member in accordance with a balance between a pressure representative of a carburetor venturi vacuum and the exhaust gas pressure of the engine.
Claim 3
Dependent Claim
25 words
The system of claim 1 further including a vacuum amplifying means which amplifies the venturi vacuum before it is supplied to said pressure regulating valve.
Claim 4
Dependent Claim
80 words
The system of claim 1, wherein said pressure regulating valve comprises a duplex diaphragm means including first and second diaphragms connected together with a common rod element, said first diaphragm being adapted to be biased in a first direction by the venturi vacuum while said second diaphragm being adapted to be biased in a second direction opposite to said first direction by the exhaust gas pressure, said common rod element actuating said valve member which regulates said control signal pressure.
Claim 5
Dependent Claim
28 words
The system of claim 3, wherein said valve member controls the opening of a bleed port which opens a passage of said control signal pressure to the atmosphere.
Claim 6
Dependent Claim
57 words
The system of claim 1, wherein said secondary air control valve comprises a diaphragm means adapted to be actuated by said control signal pressure and a valve member operated by said diaphragm means, said last mentioned valve member controlling the opening of a bleed port which opens said passage means for conducting secondary air to the atmosphere.
Claim 7
Dependent Claim
39 words
The system of claim 5, wherein said control signal pressure is vacuum in an intake manifold of the engine transmitted to said diaphragm means of the secondary air control valve under a regulation effected by said pressure regulating valve.
Claim 8
Dependent Claim
37 words
The system of claim 5, wherein said control signal pressure is pressure of said secondary air source transmitted to said diaphragm means of said secondary air control valve under a regulation effected by said pressure regulating valve.
Claim 9
Dependent Claim
87 words
The system of claim 2, wherein said vacuum amplifying means comprises a diaphragm means and a valve structure actuated by said diaphragm means, said diaphragm means being adapted to be biased by the venturi vacuum, and valve structure including a port which opens in the midst of a passage means for transmitting intake vacuum to said pressure regulating valve, wherein the opening of said port is controlled by a valve member in accordance with the biasing of said diaphragm means effected by variation in the venturi vacuum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |