Patent US3775971A successfully refreshed from Google Patents.
US3775971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling the supply of air to an internal combustion engine
Assignee: Saab AB
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Filing: 1972-03-28
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Granted: 1973-12-04
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Expires: 1992-03-28
Abstract
Abstract The present invention relates to a system for controlling the supply of air to an internal combustion engine having a supercharging unit which includes an exhaust turbine and a compressor driven thereby, there being arranged in an exhaust line between the engine and the supercharging unit an afterburner to which is fed fresh air from the compressor of the supercharging unit and fuel supplied from a fuel pump. According to the present invention an electrically driven air pump is arranged to feed supplementary air to the afterburner, and also recirculation means are provided for returning a portion of the exhaust gases from the afterburner to the engine via the exhaust turbine. In this way the torque characteristic of the engine is improved, and also the content of contaminating solid products in the exhaust gases is reduced.
Inventors
- 👤 B Gadefelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:06
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02B; F02B37/00; F02B37/12; F02B37/16; F02B37/164; F02B37/166; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F01; F01N; F01N2340/00; F01N2340/04; F01N2610/00; F01N2610/03; F01N2610/08; F02B1/00; F02B1/02; F02B1/04; F02M1/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A system for controlling and compensating the supply of air to an internal combustion engine of the type having a super charging unit including a turbine, an exhaust gas line leading from said engine to said turbine for driving said turbine by said engine''s exhaust gases, an air compressor drivingly connected to said turbine, an air inlet to said compressor and a high pressure air line leading from said compressor to said engine, an afterburner disposed in said exhaust gas line between said engine and said turbine, a branch line leading from said high pressure line to said afterburner, fuel pump means for delivering fuel to said afterburner at a controlled rate, the improvement comprising an electrically driven air pump connected to said branch line to supply supplementary air to said branch line when the air flow in said branch line falls below a predetermined level, and a recirculation line connected between said turbine and said engine for recirculating at least part of the engine''s exhaust gases to said engine.
Claim 2
Independent Claim
170 words
A system for controlling and compensating the supply of air to an internal combustion engine of the type having a super charging unit including a turbine, an exhaust gas line leading from said engine to said turbine for driving said turbine by said engine''s exhaust gases, an air compressor drivingly connected to said turbine, an air inlet to said compressor and a high pressure air line leading from said compressor to said engine, an afterburner disposed in said exhaust gas line between said engine and said turbine, a branch line leading from said high pressure line to said afterburner, fuel pump means for delivering fuel to said afterburner at a controlled rate, the improvement comprising an electrically driven air pump connected to said branch line to supply supplementary air to said branch line when the air flow in said branch line falls below a predetermined level, and a recirculation line connected between said turbine and said engine for recirculating at least part of the engine''s exhaust gases to said engine.
Claim 3
Dependent Claim
23 words
The system as claimed in claim 1, wherein said recirculation line is provided with throttle means for regulating the flow of gases therethrough.
Claim 4
Dependent Claim
49 words
The system as claimed in claim 1 wherein said recirculation line and said high pressure air line are combined to form a common inlet to said engine and throttle means are provided in said common inlet to control the flow of air and exhaust gases from said supercharging unit.
Claim 5
Dependent Claim
44 words
The system as claimed in claim 1 wherein said air pump is connected to said branch line by means of a conduit and throttle means are provided in said conduit to control the flow of air from said air pump to said branch line.
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |