US4009701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine having provisions for heating the fuel-air mixture by means of the exhaust
Assignee: Audi AG
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Filing: 1976-05-20
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Granted: 1977-03-01
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Expires: 1996-05-20
Abstract
Abstract A device heats the fuel-air mixture by means of the exhaust in an internal combustion engine having an intake for the fuel-air mixture and an exhaust gas line, with a portion of the intake and a portion of the exhaust line having a common wall for heat transfer.
Inventors
- 👤 Max Ruf
- 👤 Johannes Steinwart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:32
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; F02M31/087; F02M31/20; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
An internal combustion engine having an intake for the fuel-air mixture and an exhaust line, a device for pre-heating the fuel-air mixture by means of the engine exhaust comprising a portion of the intake and a portion of the exhaust line having a common wall for heat transfer, the heat-transfer wall having a plurality of through coolant passages and means for connecting the passages to a source of coolant when a certain operating temperature is reached.
Claim 2
Dependent Claim
76 words
An internal combustion engine having an intake for the fuel-air mixture and an exhaust line, a device for pre-heating the fuel-air mixture by means of the engine exhaust comprising a portion of the intake and a portion of the exhaust line having a common wall for heat transfer, the heat-transfer wall having a plurality of through coolant passages and means for connecting the passages to a source of coolant when a certain operating temperature is reached.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein the coolant source is in the form of a blower capable of being controlled by the temperature of the engine.
Claim 4
Dependent Claim
62 words
A device according to claim 1, wherein the engine is a liquid cooled engine having a radiator and a cooling fan arranged in the vicinity of the radiator, the cooling fan being the source of coolant, a flap controlled by the temperature of the engine being arranged in the line extending from the fan to the coolant passages in the heat-transferring wall.
Claim 5
Dependent Claim
29 words
A device according to claim 3, wherein the coolant passages in the heat-transferring wall connect with the line which is connected in turn to the intake of the engine.
Claim 6
Dependent Claim
49 words
A device according to claim 1, wherein a reactor chamber surrounded by a jacket receives the exhaust of the engines, the heat-transferring wall forms part of the jacket of the chamber and an opening is provided in the wall of the chamber at the point facing the heat-transferring wall.
Claim 7
Dependent Claim
43 words
A device according to claim 5, wherein baffles are arranged in the reactor chamber that guide the exhaust flow to the point facing the heat-transferring wall in the wall of the reactor chamber only after transversal of a substantial portion of the chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |