US3827412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust recirculation
Assignee: Old Carco LLC
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Filing: 1972-09-18
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Granted: 1974-08-06
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Expires: 1992-09-18
Abstract
Abstract Automobile exhaust gases are recycled by means of a recycling 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 hot spot to facilitate heating of the latter, and discharges the hot exhaust gases at a restricted downstream end in opposition to the inlet flow of the fuel-air mixture at a location directly below the throttle valve. A second restricted duct extends within the sidewall of the carburetor inlet induction conduit and bypasses the throttle valve, opens into the induction conduit upstream of the throttle valve to receive inlet gases during idle, and discharges into the recycling duct between the latter''s upstream and downstream restrictions to inhibit exhaust flow through said recycling duct during engine idle operation.
Inventors
- 👤 D Waitzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:28
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/59; F02M26/60; F02M26/13; F02M26/36; F02M26/41
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
216 words
In an internal combustion engine, A. an inlet header for conducting a combustible fuel-air mixture into said engine, B. a throttle valve movable in said header between idle and open positions, C. an exhaust header for discharging combustiOn products from said engine, and D. means for recycling exhaust gases from said exhaust header to said inlet header as a function of engine operation to inhibit the formation of nitrogen oxides comprising recycling duct means having 1. a restricted upstream opening communicating with said exhaust header to receive exhaust gases, 2. means for discharging the last named exhaust gases into said inlet header at a location downstream of said throttle valve when the latter is at its idle position comprising a first restricted downstream opening communicating with said inlet header at said location, and 3. a second restricted downstream opening communicating with said recycling duct means at a location between said upstream opening and first downstream opening, and 4. means for increasing the pressure at the last named location when said throttle valve moves from an open to its idle position comprising a. a pressure conducting inhibitor duct communicating with said second downstream opening, and b. means for increasing the pressure in said inhibitor duct when said throttle valve moves from said open to its idle position.
Claim 2
Dependent Claim
216 words
In an internal combustion engine, A. an inlet header for conducting a combustible fuel-air mixture into said engine, B. a throttle valve movable in said header between idle and open positions, C. an exhaust header for discharging combustiOn products from said engine, and D. means for recycling exhaust gases from said exhaust header to said inlet header as a function of engine operation to inhibit the formation of nitrogen oxides comprising recycling duct means having 1. a restricted upstream opening communicating with said exhaust header to receive exhaust gases, 2. means for discharging the last named exhaust gases into said inlet header at a location downstream of said throttle valve when the latter is at its idle position comprising a first restricted downstream opening communicating with said inlet header at said location, and 3. a second restricted downstream opening communicating with said recycling duct means at a location between said upstream opening and first downstream opening, and 4. means for increasing the pressure at the last named location when said throttle valve moves from an open to its idle position comprising a. a pressure conducting inhibitor duct communicating with said second downstream opening, and b. means for increasing the pressure in said inhibitor duct when said throttle valve moves from said open to its idle position.
Claim 3
Dependent Claim
43 words
means for discharging the last named exhaust gases into said inlet header at a location downstream of said throttle valve when the latter is at its idle position comprising a first restricted downstream opening communicating with said inlet header at said location, and
Claim 4
Dependent Claim
43 words
means for discharging the last named exhaust gases into said inlet header at a location downstream of said throttle valve when the latter is at its idle position comprising a first restricted downstream opening communicating with said inlet header at said location, and
Claim 5
Dependent Claim
85 words
In the combination according to claim 1, said inhibitor duct communicating with said inlet header at a location whereat the pressure therein decreases upon predetermined opening movement of said throttle valve from its idle position, the restrictions for said openings being dimensioned with respect to each other to effect air flow from said inlet header through the second downstream opening amounting to between approximately 50 and 80 percent of the desired air to support idle combustion when said throttle valve is at its idle position.
Claim 6
Dependent Claim
102 words
In the combination according to claim 1, said inhibitor duct communicating with said inlet header upstream of said throttle valve at the idle position at a location whereat the pressure decreases upon predetermined opening movement of said throttle valve from said idle position, the restrictions for said openings being dimensioned so that when said throttle valve is at its idle position, the pressure in said inlet header upstream of said throttle valve is greater than the pressure in said recycling duct means between said upstream opening and first downstream opening, thereby to inhibit the flow of exhaust gases through said upstream opening.
Claim 7
Dependent Claim
23 words
a second restricted downstream opening communicating with said recycling duct means at a location between said upstream opening and first downstream opening, and
Claim 8
Dependent Claim
23 words
a second restricted downstream opening communicating with said recycling duct means at a location between said upstream opening and first downstream opening, and
Claim 9
Dependent Claim
38 words
In the combination according to claim 3, the restrictions for said openings being also dimensioned to effect a flow of exhaust gases into said inlet header via said second downstream opening, upon predetermined opening of said throttle valve.
Claim 10
Dependent Claim
58 words
means for increasing the pressure at the last named location when said throttle valve moves from an open to its idle position comprising a. a pressure conducting inhibitor duct communicating with said second downstream opening, and b. means for increasing the pressure in said inhibitor duct when said throttle valve moves from said open to its idle position.
Claim 11
Dependent Claim
58 words
means for increasing the pressure at the last named location when said throttle valve moves from an open to its idle position comprising a. a pressure conducting inhibitor duct communicating with said second downstream opening, and b. means for increasing the pressure in said inhibitor duct when said throttle valve moves from said open to its idle position.
Claim 12
Dependent Claim
111 words
In the combination according to claim 2, said throttle valve comprising a blade pivotal in said inlet conduit between idle and open positions and having an upstream edge at said idle position adjacent and downstream of said location whereat said inhibitor duct communicates with said inlet header, said blade being arranged to swing upstream of the last named location upon predetermined opening of said throttle valve from said idle position, the restrictions for said openings being dimensioned to effect fluid flow from said inlet header through said second downstream opening to inhibit fluid flow from said exhaust header through said upstream opening when said throttle valve is at its idle position.
Claim 13
Dependent Claim
57 words
In the combination according to claim 3, the restrictions for said openings being dimensioned with respect to each other to effect air flow from said inlet header through the second downstream opening amounting to between approximately 50 and 80 percent of the desired air to support idle combustion when said throttle valve is at its idle position.
Claim 14
Dependent Claim
55 words
In the combination according to claim 1, said exhaust header having a wall portion extending transversely to the flow of said fuel-air mixture in said inlet header to provide a hot spot for impingement of said mixture thereagainst, the first downstream opening of said recycling duct extending through said hot wall in heat transfer relationship.
Claim 15
Dependent Claim
29 words
In the combination according to claim 7, said first downstream opening being directed in opposition to the flow of said fuel-air mixture at the region of said hot wall.
Claim 16
Dependent Claim
87 words
In the combination according to claim 3, said inhibitor duct extending in the sidewall of said inlet header in heat exchange relationship therewith, thereby to cool said sidewall by air flow through said inhibitor duct when said throttle valve is at said idle position, and an idle fuel duct extending in said sidewall for conducting an idle fuel and air mixture into said inlet conduit downstream of said throttle valve, said idle fuel duct extending in said sidewall adjacent said inhibitor duct in heat exchange relationship therewith.
Claim 17
Dependent Claim
142 words
In the combination according to claim 9, said throttle valve comprising a blade pivotal in said inlet conduit between idle and open positions and having an upstream edge at said idle position adjacent and downstream of said location whereat said inhibitor duct communicates with said inlet header, said blade being arranged to swing upstream of the last named location upon predetermined opening of said throttle valve from said idle position, the restrictions for said openings being dimensioned to effect fluid flow from said inlet header through said second downstream opening to inhibit fluid flow from said exhaust header through said upstream opening when said throttle valve is at its idle position, the restrictions for said openings being also dimensioned to effect a flow of exhaust gases into said inlet header via said second downstream opening upon predetermined opening of said throttle valve.
Claim 18
Dependent Claim
36 words
In the combination according to claim 1, said means for increasing the pressure in said inhibitor duct comprising means for communicating the same with substantially atmospheric pressure when said throttle valve is at its idle position.
Claim 19
Dependent Claim
30 words
In the combination according to claim 1, said first downstream opening of said recycling duct means being comparatively larger than said upstream opening thereof to facilitate passage of exhaust particulates.
Claim 20
Dependent Claim
30 words
In the combination according to claim 2, said first downstream opening of said recycling duct means being comparatively larger than said upstream opening thereof to facilitate passage of exhaust particulates.
Claim 21
Dependent Claim
111 words
In the combination according to claim 13, said throttle valve comprising a blade pivotal in said inlet conduit between idle and open positions and having an upstream edge at said idle position adjacent and downstream of said location whereat said inhibitor duct communicates with said inlet header, said blade being arranged to swing upstream of the last named location upon predetermined opening of said throttle valve from said idle position, the restrictions for said openings being dimensioned to effect fluid flow from said inlet header through said second downstream opening to inhibit fluid flow from said exhaust header through said upstream opening when said throttle valve is at its idle position.
Claim 22
Dependent Claim
30 words
In the combination according to claim 6, said first downstream opening of said recycling duct means being comparatively larger than said upstream opening thereof to facilitate passage of exhaust particulates.
Claim 23
Dependent Claim
111 words
In the combination according to claim 15, said throttle valve comprising a blade pivotal in said inlet conduit between idle and open positions and having an upstream edge at said idle position adjacent and downstream of said location whereat said inhibitor duct communicates with said inlet header, said blade being arranged to swing upstream of the last named location upon predetermined opening of said throttle valve from said idle position, the restrictions for said openings being dimensioned to effect fluid flow from said inlet header through said second downstream opening to inhibit fluid flow from said exhaust header through said upstream opening when said throttle valve is at its idle position.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |