US3646923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled floor jet engine exhaust recirculation
Assignee: Old Carco LLC
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Filing: 1970-04-22
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Granted: 1972-03-07
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Expires: 1990-04-22
Abstract
Abstract Automobile exhaust gases are recycled by means of a bypass duct which receives these gases at a restricted upstream end located within the environment of the hot gases of the exhaust system, passes in heat exchange relationship through the conventional intake manifold hotspot to facilitate heating of the latter, and discharges the hot exhaust gases in an upstream direction with respect to the inlet flow of the fuel-air mixture at a location directly below the throttle valve. The restriction of the upstream end is spaced from the hotspot to minimize heat loss to the latter, such that lead contaminants for example flow in a gaseous phase through the restriction without fouling the same. A bypass control plunger movable in response to the position of the throttle valve is insertable into the restriction to close and simultaneously clean the latter when the throttle valve moves either to its idle or wide open position.
Inventors
- 👤 Jorma O Sarto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:39
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/63; F02M26/13; F02M26/17; F02M26/21; F02M26/41; F02M26/55; F02M26/58; F02M26/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
202 words
In an internal combustion engine adapted to use a gasoline fuel containing a lead additive, B. an exhaust header for discharging the hot combustion products from said engine and having a wall portion comprising a hotspot exposed to the flow of said fuel-air mixture in said inlet header to heat said mixture, A. an inlet header for conducting a fuel-air inlet mixture into said engine for combustion therein, C. and means for effectively inhibiting the formation of oxides of nitrogen during said combustion by limiting the combustion temperature comprising a bypass duct for conducting hot exhaust gases from said exhaust header into said inlet header, said bypass duct extending through said hotspot in heat transfer relationship to facilitate heating thereof and having 1. one end opening into said exhaust header at a location within the hot exhaust gases and spaced from said hotspot, 2. a second end opening into said inlet header, and 3. a restriction in said bypass duct adjacent the opening of said one end within said hot gases and spaced from said hotspot to reduce heat loss thereto from said restriction to obtain a temperature at the latter above the precipitation temperature of lead contaminants in said exhaust gases.
Claim 2
Dependent Claim
202 words
In an internal combustion engine adapted to use a gasoline fuel containing a lead additive, B. an exhaust header for discharging the hot combustion products from said engine and having a wall portion comprising a hotspot exposed to the flow of said fuel-air mixture in said inlet header to heat said mixture, A. an inlet header for conducting a fuel-air inlet mixture into said engine for combustion therein, C. and means for effectively inhibiting the formation of oxides of nitrogen during said combustion by limiting the combustion temperature comprising a bypass duct for conducting hot exhaust gases from said exhaust header into said inlet header, said bypass duct extending through said hotspot in heat transfer relationship to facilitate heating thereof and having 1. one end opening into said exhaust header at a location within the hot exhaust gases and spaced from said hotspot, 2. a second end opening into said inlet header, and 3. a restriction in said bypass duct adjacent the opening of said one end within said hot gases and spaced from said hotspot to reduce heat loss thereto from said restriction to obtain a temperature at the latter above the precipitation temperature of lead contaminants in said exhaust gases.
Claim 3
Dependent Claim
9 words
a second end opening into said inlet header, and
Claim 4
Dependent Claim
9 words
a second end opening into said inlet header, and
Claim 5
Dependent Claim
28 words
In the combination according to claim 1, said hotspot extending transversely to the flow of said fuel-air mixture in said inlet header for impingement of said mixture thereagainst.
Claim 6
Dependent Claim
52 words
In the combination according to claim 1, the second end of said bypass duct opening into said inlet header in an upstream direction with respect to the flow of said mixture to direct a stream of hot exhaust gases in opposition to said flow to enhance mixing and vaporization of said mixture.
Claim 7
Dependent Claim
48 words
a restriction in said bypass duct adjacent the opening of said one end within said hot gases and spaced from said hotspot to reduce heat loss thereto from said restriction to obtain a temperature at the latter above the precipitation temperature of lead contaminants in said exhaust gases.
Claim 8
Dependent Claim
48 words
a restriction in said bypass duct adjacent the opening of said one end within said hot gases and spaced from said hotspot to reduce heat loss thereto from said restriction to obtain a temperature at the latter above the precipitation temperature of lead contaminants in said exhaust gases.
Claim 9
Dependent Claim
57 words
In the combination according to claim 3, a throttle valve in said inlet header upstream of said one end and movable between idle and wide open positions, said second end opening into said inlet header at a location increasingly exposed to the opposing flow of said mixture as said throttle valve moves to its wide open position.
Claim 10
Dependent Claim
61 words
In the combination according to claim 1, a throttle valve in said inlet header movable between idle and wide open positions, said restriction comprising a restricted orifice in said bypass duct, and normally open valve means responsive to the position of said throttle valve for restricting said orifice when said throttle valve is adjacent either its idle or wide open position.
Claim 11
Dependent Claim
30 words
In the combination according to claim 1, said restriction being spaced within said exhaust header from said hotspot sufficiently to maintain an operating temperature at said restriction above 700* F.
Claim 12
Dependent Claim
50 words
In the combination according to claim 1, said bypass duct having a comparatively short length on the order of magnitude of the wall thickness of said hotspot and extending directly through said hotspot and terminating within said inlet header proximate the surface of said hotspot exposed to said inlet mixture.
Claim 13
Dependent Claim
25 words
In the combination according to claim 7, said bypass duct being comparatively resistance free to the flow of exhaust gases therethrough downstream of said restriction.
Claim 14
Dependent Claim
18 words
In the combination according to claim 7, the opening of said bypass duct enlarging downstream of said restriction.
Claim 15
Dependent Claim
79 words
In the combination according to claim 9, a throttle valve in said inlet header movable between idle and wide open positions, a valve plunger within said inlet header movable obliquely within the enlarging downstream opening of said bypass duct, and means responsive to the position of said throttle valve for normally maintaining said plunger out of said restriction and for moving said plunger into said restriction when said throttle valve is adjacent either its idle or wide open position.
Claim 16
Dependent Claim
103 words
In the combination according to claim 1, the opening of said bypass duct enlarging conically downstream of said restriction, a throttle valve in said inlet header movable between idle and wide open positions, a valve plunger reciprocable along the conical surface of the conically enlarging opening of said bypass duct and within said restriction to reduce the opening of the latter, and plunger operating means responsive to the position of said throttle valve for normally maintaining said plunger out of said restriction and for moving said plunger into said restriction when said throttle valve is adjacent either its idle or wide open position.
Claim 17
Dependent Claim
58 words
In the combination according to claim 11, said second end of said bypass duct opening into said inlet header at a location shielded from the opposing flow of said mixture by said throttle valve when the latter is at its idle position and exposed to said opposing flow when said throttle valve moves to its wide open position.
Claim 18
Dependent Claim
49 words
In the combination according to claim 11, said bypass duct being located centrally with respect to the flow of said mixture downstream of said throttle valve, said plunger having a remote end out of said flow, and said plunger operating means engaging said remote end to operate said plunger.
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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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |