US3820328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the post combustion of the unburnt substances in the exhaust gases of the internal combustion engine of a motor vehicle
Assignee: Fiat Auto SpA
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Filing: 1971-09-22
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Granted: 1974-06-28
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Expires: 1991-09-22
Abstract
Abstract A post-combustion device for the control of unburnt and polluting substances in the exhaust gases of the internal combustion engine of vehicles, in which there is provided a postcombustion chamber and a shut-off valve of the exhaust pipe, with this valve controlling whether the exhaust gases are conveyed through the post-combustion chamber or the latter is by-passed, the post-combustion chamber being positioned near the engine but the shut-off valve being positioned remote from the engine so as to obtain a particular relationship of the engine temperature with respect to these members.
Inventors
- 👤 G Garcea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:38
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
230 words
A device for discharging to the atmosphere the burnt gases of an internal combustion engine of a motor vehicle, comprising a main exhaust pipe having a terminal portion and a supplementary exhaust pipe disposed parallel to the main pipe, means defining a chamber for the further combustion of the unburnt components present in the exhaust gases of the engine, said combustion chamber being positioned in a part of the supplementary exhaust pipe in which the temperature of the exhaust gases is not far lower than the temperature of the exhaust gases issuing from the engine cylinders, a shut-off valve of the main exhaust pipe positioned in the terminal portion of the main exhaust pipe, in said portion the gas temperature being lower than the gas temperature at the outlet of the engine cylinders, said shut-off valve being of the poppet type, the main exhaust pipe having in said terminal portion an enlargement providing a seat for the poppet valve element, whose opening and closing movements, take place as displacements along the axis of the main exhaust pipe at said terminal portion, and automatic actuating means for said shut-off valve by which said valve is opened at high engine working powers and at high temperatures of the gases in the postcombustion chamber while at low working powers and at reduced gas temperatures in said post-combustion chamber the shut-off valve is closed.
Claim 2
Independent Claim
230 words
A device for discharging to the atmosphere the burnt gases of an internal combustion engine of a motor vehicle, comprising a main exhaust pipe having a terminal portion and a supplementary exhaust pipe disposed parallel to the main pipe, means defining a chamber for the further combustion of the unburnt components present in the exhaust gases of the engine, said combustion chamber being positioned in a part of the supplementary exhaust pipe in which the temperature of the exhaust gases is not far lower than the temperature of the exhaust gases issuing from the engine cylinders, a shut-off valve of the main exhaust pipe positioned in the terminal portion of the main exhaust pipe, in said portion the gas temperature being lower than the gas temperature at the outlet of the engine cylinders, said shut-off valve being of the poppet type, the main exhaust pipe having in said terminal portion an enlargement providing a seat for the poppet valve element, whose opening and closing movements, take place as displacements along the axis of the main exhaust pipe at said terminal portion, and automatic actuating means for said shut-off valve by which said valve is opened at high engine working powers and at high temperatures of the gases in the postcombustion chamber while at low working powers and at reduced gas temperatures in said post-combustion chamber the shut-off valve is closed.
Claim 3
Dependent Claim
46 words
The device as claimed in claim 1 in which individual exhaust pipes from individual cylinders of the engine merge together into a single tube and downstream of this merger a branch is disposed permitting the gases to flow into the main pipe or the supplementary pipe.
Claim 4
Dependent Claim
37 words
The device as claimed in claim 1, in which in each individual exhaust pipe from an individual cylinder of the engine a branch is disposed permitting the gases to flow into the main pipe or supplementary pipe.
Claim 5
Dependent Claim
26 words
The device as claimed in claim 1 in which each of the two said exhaust pipes in parallel has its own individual gas outlet to atmosphere.
Claim 6
Dependent Claim
61 words
The device as claimed in claim 1 in which the shut-off valve is operated in relation to the movement of a movable surface, on which the feed pressure of the internal combustion engine acts, a container for the movable surface, the valve being opened by means of said operation at high engine working powers and closed at lower engine working powers.
Claim 7
Dependent Claim
85 words
The device as claimed in claim 5 comprising an element sensitive to the temperature of the gases leaving the chamber and a pressure regulation member inserted in a pipe connecting a suction manifold of the engine to the container of said movable surface, said element sensitive to the temperature of the gases acting on said regulation member so that the shut-off valve in the main pipe, even at low working power, is opened when the temperature of the gas leaving the chamber reaches high values.
Claim 8
Dependent Claim
16 words
The device as claimed in claim 1 in which the chamber consists of a thermal reactor.
Claim 9
Dependent Claim
16 words
The device as claimed in claim 1 in which the chamber consists of a catalytic box.
Claim 10
Dependent Claim
32 words
The device as claimed in claim 1 in which at least a first part of the supplementary exhaust pipe, contrary to the main pipe, is made of double wall stainless steel sheet.
Claim 11
Independent Claim
217 words
A device for discharging to the atmosphere the burnt gases of an internal combustion engine of a motor vehicle, comprising a main exhaust pipe having a terminal portion and a supplementary exhaust pipe disposed parallel to the main pipe, a shut-off valve positioned in the terminal portion of the main pipe, means defining a chamber for the further combustion of the unburnt components present in the exhaust gases of the engine, said combustion chamber being positioned in a part of the supplementary exhaust pipe in which the temperature of the exhaust gases is higher than the temperature of the same exhaust gases at the terminal portion of the main pipe and hence higher than the temperature of the gases passing through the shut-off valve, and automatic actuating means for said shut-off valve by which said valve is opened at high engine working powers at high temperatures of the gases in the post-combustion chamber while at low working powers and at reduced gas temperatures in said post-combustion chamber the shut-off valve is closed, the main exhaust pipe comprising an enlargement at its outlet to the atmosphere which forms a tight seat for a plane valve comprising said shut-off valve whose opening and closing movement is essentially a traverse along the axis of the main pipe at its outlet.
Claim 12
Independent Claim
217 words
A device for discharging to the atmosphere the burnt gases of an internal combustion engine of a motor vehicle, comprising a main exhaust pipe having a terminal portion and a supplementary exhaust pipe disposed parallel to the main pipe, a shut-off valve positioned in the terminal portion of the main pipe, means defining a chamber for the further combustion of the unburnt components present in the exhaust gases of the engine, said combustion chamber being positioned in a part of the supplementary exhaust pipe in which the temperature of the exhaust gases is higher than the temperature of the same exhaust gases at the terminal portion of the main pipe and hence higher than the temperature of the gases passing through the shut-off valve, and automatic actuating means for said shut-off valve by which said valve is opened at high engine working powers at high temperatures of the gases in the post-combustion chamber while at low working powers and at reduced gas temperatures in said post-combustion chamber the shut-off valve is closed, the main exhaust pipe comprising an enlargement at its outlet to the atmosphere which forms a tight seat for a plane valve comprising said shut-off valve whose opening and closing movement is essentially a traverse along the axis of the main pipe at its outlet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |