Patent US1818909A successfully refreshed from Google Patents.
US3554174A
Expired / Lapsed
US
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Dual circuit induction system
Assignee: Dynatech Corp
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Filing: 1969-07-07
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Granted: 1971-01-12
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Expires: 1989-07-07
Abstract
Abstract An improved induction system for internal combustion engines comprising a relatively large capacity throttle controlled ambient air induction circuit and a relatively small capacity unthrottled air induction circuit for high-temperature air, the air induction balance between the circuits being variable to automatically and continuously regulate engine inlet air temperature between a maximum at idle and a minimum at full load, and means for admitting fuel to the inlet in such quantities that the fuel-air ratio approaches the lean limit of combustibility corresponding to the inlet air temperature provided at each throttle setting across a wide range of engine operating conditions. Both carburetion and fuel injection systems are disclosed.
Inventors
- 👤 Lawrence G Clawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:44
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02B; F02B29/00; F02M1/00; F02M31/045; F02M31/047; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
303 words
Apparatus for regulating the induction air inlet temperature of an internal combustion engine having at least one combustion chamber and an inlet thereto over a range of engine-operating conditions comprising: a first induction circuit for admitting air at ambient temperature and in variable quantities to the inlet over the power range of the engine, means disposed in the first induction circuit for selectively and variably throttling the air admitted therethrough to operate the engine over the power range, a second induction circuit of substantially lesser flow capacity then the first of substantially lesser flow capacity than the first induction circuit for admitting air at substantially elevated temperatures and in variable quantities to the inlet over the power range of the engine, heating means associated with the secondary circuit for substantially elevating the temperature of air flowing therethrough (between minimum and maximum temperatures,) to a sufficient temperature that the net temperature of the air admitted to the inlet is no less than 400* F. under low power condition, the flow rate through the secondary circuit being regulated by the pressure conditions at the inlet such that the temperature of the total air admitted to the inlet varies continuously with continuously varying load between a maximum temperature (defined by the temperature of the air in the secondary circuit) of at least 400* F. under minimum engine power operation and a minimum temperature approaching ambient temperature under maximum engine power operation, and metering means for admitting fuel to the inlet (in variable quantities such that the fuel-air ratio at the inlet approaches the combustible lean limit for any given inlet temperature and pressure), Said metering means being regulable to meter fuel to the engine in such quantities as to provide an air-fuel ratio of approximately 20 to 1 over a substantial portion of the engineoperating range.
Claim 2
Dependent Claim
303 words
Apparatus for regulating the induction air inlet temperature of an internal combustion engine having at least one combustion chamber and an inlet thereto over a range of engine-operating conditions comprising: a first induction circuit for admitting air at ambient temperature and in variable quantities to the inlet over the power range of the engine, means disposed in the first induction circuit for selectively and variably throttling the air admitted therethrough to operate the engine over the power range, a second induction circuit of substantially lesser flow capacity then the first of substantially lesser flow capacity than the first induction circuit for admitting air at substantially elevated temperatures and in variable quantities to the inlet over the power range of the engine, heating means associated with the secondary circuit for substantially elevating the temperature of air flowing therethrough (between minimum and maximum temperatures,) to a sufficient temperature that the net temperature of the air admitted to the inlet is no less than 400* F. under low power condition, the flow rate through the secondary circuit being regulated by the pressure conditions at the inlet such that the temperature of the total air admitted to the inlet varies continuously with continuously varying load between a maximum temperature (defined by the temperature of the air in the secondary circuit) of at least 400* F. under minimum engine power operation and a minimum temperature approaching ambient temperature under maximum engine power operation, and metering means for admitting fuel to the inlet (in variable quantities such that the fuel-air ratio at the inlet approaches the combustible lean limit for any given inlet temperature and pressure), Said metering means being regulable to meter fuel to the engine in such quantities as to provide an air-fuel ratio of approximately 20 to 1 over a substantial portion of the engineoperating range.
Claim 3
Dependent Claim
40 words
Apparatus as defined in claim 1 wherein the heating means is constructed and arranged such that the (maximum) temperature of the air admitted to the inlet under low-power conditions is in the range substantially between 400* F. and 1,000* F.
Claim 4
Dependent Claim
36 words
Apparatus as defined in claim 1 wherein the means for admitting fuel is arranged such that the fuel-air ratio under minimum and part-load engine power operating condition is in the range between approximately 0.06 and 0.04.
Claim 5
Dependent Claim
22 words
Apparatus as defined in claim 1 wherein the first induction circuit includes a carburetor having a body portion mounted on the engine.
Claim 6
Dependent Claim
33 words
Apparatus as defined in claim 4 wherein the means for admitting fuel includes a first fuel line connected to the body portion for admitting fuel thereto in quantities related to the airflow therethrough.
Claim 7
Dependent Claim
27 words
Apparatus as defined in claim 5 including a second fuel line connected to the secondary circuit for admitting fuel thereto in quantities related to the airflow therethrough.
Claim 8
Dependent Claim
22 words
Apparatus as defined in clAim 1 wherein the heating means includes a heat exchanger heated by the exhaust gases of the engine.
Claim 9
Dependent Claim
47 words
Apparatus as defined in claim 7 wherein the heating means is arranged such that the temperature of the air in the secondary circuit has a minimum temperature in the range between 600* F. and 1,000* F. and a maximum temperature approaching the temperature of the exhaust gases.
Claim 10
Dependent Claim
28 words
Apparatus as defined in claim 1 wherein the means for admitting fuel comprises an injector device operatively associated with the inlet for metering fuel thereto in varying quantities.
Claim 11
Independent Claim
90 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously varying the temperature of air admitted to the inlet from a maximum temperature of at least 400* F. under low-power engine-operating conditions, to a minimum temperature approaching ambient under high-power engine-operating conditions, and admitting fuel to the inlet in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 12
Independent Claim
90 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously varying the temperature of air admitted to the inlet from a maximum temperature of at least 400* F. under low-power engine-operating conditions, to a minimum temperature approaching ambient under high-power engine-operating conditions, and admitting fuel to the inlet in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 13
Independent Claim
94 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: continuously varying the temperature of air admitted to the inlet with varying engine-operating conditions from a maximum temperature in the range between approximately 400* F. and 1, 000* F. under low-power engine-operating conditions to a minimum temperature approaching ambient under high power engine operating conditions, and admitting fuel to the inlet in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 14
Independent Claim
94 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: continuously varying the temperature of air admitted to the inlet with varying engine-operating conditions from a maximum temperature in the range between approximately 400* F. and 1, 000* F. under low-power engine-operating conditions to a minimum temperature approaching ambient under high power engine operating conditions, and admitting fuel to the inlet in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 15
Dependent Claim
24 words
The method defined in claim 11 wherein the fuel-air ratio under maximum inlet temperature conditions is in the range between approximately 0.04 and 0.06.
Claim 16
Independent Claim
152 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously regulating the temperature of air at the inlet by supplying air at ambient temperature to the inlet in varying quantities related to engine power through a first throttled induction circuit, supplying air at temperatures elevated to at least approximately 600* F. to the inlet in varying quantities related to inlet pressure through a second induction circuit, mixing the air supplied to the inlet to produce a net inlet temperature which varies continuously from a maximum temperature of at least approximately 400* F. under low-power conditions to a minimum approaching ambient under high-power conditions, and admitting fuel to the inlet air in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 17
Independent Claim
152 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously regulating the temperature of air at the inlet by supplying air at ambient temperature to the inlet in varying quantities related to engine power through a first throttled induction circuit, supplying air at temperatures elevated to at least approximately 600* F. to the inlet in varying quantities related to inlet pressure through a second induction circuit, mixing the air supplied to the inlet to produce a net inlet temperature which varies continuously from a maximum temperature of at least approximately 400* F. under low-power conditions to a minimum approaching ambient under high-power conditions, and admitting fuel to the inlet air in such quantities that the fuel-air ratio of the charge in the inlet is approximately 0.05 over a substantial portion of the engine-operating range.
Claim 18
Independent Claim
150 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously regulating the temperature of air at the inlet by supplying air at ambient temperature to the inlet in varying quantities related to engine power through a first throttled induction circuit, supplying air at temperatures elevated to at least approximately 600* F. to the inlet in varying quantities related to inlet pressure through a second induction circuit, mixing the air supplied to the inlet to produce a net inlet temperature which varies continuously from a maximum temperature of at least approximately 400* F. under low-power conditions to a minimum approaching ambient under high-power conditions, and admitting fuel to the inlet air in such quantities that the fuel-air ratio is less than 0.06 over a substantial portion of the operating range of the engine.
Claim 19
Independent Claim
150 words
A method of operating an internal combustion engine having at least one combustion chamber inlet comprising the steps of: operating the engine between low and high-power conditions, continuously regulating the temperature of air at the inlet by supplying air at ambient temperature to the inlet in varying quantities related to engine power through a first throttled induction circuit, supplying air at temperatures elevated to at least approximately 600* F. to the inlet in varying quantities related to inlet pressure through a second induction circuit, mixing the air supplied to the inlet to produce a net inlet temperature which varies continuously from a maximum temperature of at least approximately 400* F. under low-power conditions to a minimum approaching ambient under high-power conditions, and admitting fuel to the inlet air in such quantities that the fuel-air ratio is less than 0.06 over a substantial portion of the operating range of the engine.
Claim 20
Dependent Claim
30 words
The method defined in claim 14 wherein the fuel is admitted directly into the first and second induction circuits in respective quantities related to the quantities of air flowing therethrough.
Claim 21
Dependent Claim
17 words
The method defined in claim 14 wherein the fuel is injected into the inlet of the engine.
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |