US3874166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for reducing harmful emissions from internal combustion engines
Assignee: Individual
•
Filing: 1973-11-27
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Granted: 1975-04-01
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Expires: 1993-11-27
Abstract
Abstract Combustion air for an internal combustion engine is compressed in a dynamic pressure-wave machine by utilization of heat remaining in the engine exhaust gases. A reduction in harmful emissions from the engine is effected within the rotor of the pressure-wave machine due to a primary recirculation of the exhaust gas into the air at the interface between the exhaust gas and the air, the amount of the recirculation being at its lowest value at full load on the engine and being increased sharply with decreasing load. The change in the amount of exhaust gas being recirculated is made more uniform over the whole load range by means of a secondary recirculation, increasing at full load, and which is brought about by introducing exhaust gas directly into the machine in at least one place at which the cells of the rotor are filled with air by means of a crossover pipe.
Inventors
- 👤 Hubert Kirchhofer
- 👤 Josef Perevuznik
- 👤 Alfred Wunsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:27
CPC Classifications
F; F04; F04F; F04F13/00; F02; F02B; F02B33/00; F02B33/32; F02B33/42; F02M; F02M26/00; F02M26/02; F02M26/13; F02M26/40; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
In the method of providing combustion air for an internal combustion engine by compressing the air in a gas-dynamic pressure-wave machine by utilization of heat still contained in the engine exhaust gases and wherein harmful emissions from the engine are reduced as a result of a primary recirculation of exhaust gas into the air at the interface between the exhaust gas and the air in the celled rotor of the machine, the amount of the exhaust-gas recirculation being at its lowest value at full load and increasing sharply with decreasing load, the improvement which comprises the step of introducing exhaust gas directly into the machine in at least one place at which the cells of the rotor are filled with air thereby effecting a secondary recirculation of the exhaust gas which increases at full load and which serves to render recirculation of the exhaust gas more uniform over the whole load range.
Claim 2
Dependent Claim
152 words
In the method of providing combustion air for an internal combustion engine by compressing the air in a gas-dynamic pressure-wave machine by utilization of heat still contained in the engine exhaust gases and wherein harmful emissions from the engine are reduced as a result of a primary recirculation of exhaust gas into the air at the interface between the exhaust gas and the air in the celled rotor of the machine, the amount of the exhaust-gas recirculation being at its lowest value at full load and increasing sharply with decreasing load, the improvement which comprises the step of introducing exhaust gas directly into the machine in at least one place at which the cells of the rotor are filled with air thereby effecting a secondary recirculation of the exhaust gas which increases at full load and which serves to render recirculation of the exhaust gas more uniform over the whole load range.
Claim 3
Dependent Claim
139 words
Apparatus for providing combustion air for an internal combustion engine comprising a gas-dynamic pressure-wave machine in which the air is compressed by utilization of heat still contained in the exhaust gases from the engine, harmful emissions from the engine being reduced as a result of primary recirculation of exhaust gas into the air at the interface between the exhaust gas and the air in the celled rotor of the machine, said gas recirculation being at its lowest value at full load and increasing sharply with decreasing load, and means for rendering said recirculation of exhaust gas more uniform over the whole load range of the engine comprising a crossover duct for effecting secondary exhaust-gas recirculation extending from a space filled with exhaust gas to an opening facing air filled cells in the rotor in one side of the machine.
Claim 4
Dependent Claim
139 words
Apparatus for providing combustion air for an internal combustion engine comprising a gas-dynamic pressure-wave machine in which the air is compressed by utilization of heat still contained in the exhaust gases from the engine, harmful emissions from the engine being reduced as a result of primary recirculation of exhaust gas into the air at the interface between the exhaust gas and the air in the celled rotor of the machine, said gas recirculation being at its lowest value at full load and increasing sharply with decreasing load, and means for rendering said recirculation of exhaust gas more uniform over the whole load range of the engine comprising a crossover duct for effecting secondary exhaust-gas recirculation extending from a space filled with exhaust gas to an opening facing air filled cells in the rotor in one side of the machine.
Claim 5
Dependent Claim
18 words
Apparatus as defined in claim 2 and which further includes a cooling device located in said crossover duct.
Claim 6
Dependent Claim
64 words
Apparatus as defined in claim 2 wherein said crosSover duct is constituted by a return-flow pipe, the inlet opening of which as viewed in the rotational direction of the rotor lies within the first half of the low-pressure gas outlet port from the rotor and the outlet opening of which lies within the second half of the low-pressure air inlet port to the rotor.
Claim 7
Dependent Claim
51 words
Apparatus as defined in claim 4 wherein the inlet opening of said return-flow pipe is located immediately after the front edge of said low-pressure gas outlet port, and wherein the outlet opening of said return-flow pipe is located immediately in front of the rear edge of said low-pressure air inlet port.
Claim 8
Dependent Claim
46 words
Apparatus as defined in claim 2 wherein said crossover duct is constituted by a return-flow pipe which branches off the high-pressure gas inlet pipe and which as viewed in the rotational direction of the rotor emerges in a web located before the high-pressure air outlet port.
Claim 9
Dependent Claim
46 words
Apparatus as defined in claim 2 wherein said pressure-wave machine includes a compression pocket located adjacent one end of the rotor and wherein said crossover duct is constituted by a return-flow pipe which branches off the high-pressure gas inlet duct and emerges in said compression pocket.
Claim 10
Dependent Claim
46 words
Apparatus as defined in claim 2 wherein said crossover duct is constituted by a connecting pipe which branches off the high-pressure gas inlet duct and which as viewed in the rotational direction of the rotor emerges from a web located before the high-pressure gas inlet port.
Claim 11
Dependent Claim
16 words
Apparatus as defined in claim 8 wherein said connecting pipe terminates in at least one nozzle.
Claim 12
Dependent Claim
23 words
Apparatus as defined in claim 2 and which further includes a throttling device in said crossover duct provided for the secondary exhaust-gas recirculation.
Claim 13
Dependent Claim
17 words
Apparatus as defined in claim 10 and wherein the flow cross-section of said throttling device is adjustable.
References Cited (Backward Citations)
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |