US4250711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for supercharging an internal combustion engine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1976-08-19
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Granted: 1981-02-17
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Expires: 1996-08-19
Abstract
Abstract An arrangement for supercharging an internal combustion engine such as a diesel engine wherein a turbo-charger incorporating a turbine driven by the exhaust gases from the engine is coupled to and drives a compressor which provides charging air for the engine at the desired pressure. A portion of the exhaust gases is recirculated through the engine by introducing it into the charging air in a part of the compressor at a point following the rotor blading which is at a lower pressure than the exhaust gases thus avoiding any deleterious corrosion effect upon the blading. The amount of the exhaust gases being so recirculated is controlled either by an open or closed type of control circuit. The recirculated exhaust gases are conducted from either the inlet or outlet side of the turbine to the compressor through a feedback path which includes the open or closed loop control and which may also include a receiver for equalizing out any fluctuations in exhaust gas pressure, an auxiliary compressor, a cooler or a one-way valve.
Inventors
- 👤 Gottlieb Zehnder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:34
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02B; F02B37/00; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/0072; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/34; F02B3/00; F02B3/06; F02D2041/0075; F02M26/02; F02M26/04; F02M26/05; F02M26/09; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
Apparatus for supercharging an internal combustion engine comprising: a turbo-charger that includes a turbine driven by the exhaust gases from the the engine coupled to an air compressor which delivers charging air to the engine, feedback means for introducing a portion of the engine exhaust gases into the flow path of the charging air, the feedback means providing a feedback path terminating at a point within said compressor where the pressure of the charging air is lower than the pressure of the exhaust gases, the point within said compressor for introducing the exhaust gases being located downstream of the rotor blading when viewed in the flow direction, and wherein said feedback path includes an open-loop control means for controlling the amount of the exhaust gases which pass therethrough.
Claim 2
Dependent Claim
128 words
Apparatus for supercharging an internal combustion engine comprising: a turbo-charger that includes a turbine driven by the exhaust gases from the the engine coupled to an air compressor which delivers charging air to the engine, feedback means for introducing a portion of the engine exhaust gases into the flow path of the charging air, the feedback means providing a feedback path terminating at a point within said compressor where the pressure of the charging air is lower than the pressure of the exhaust gases, the point within said compressor for introducing the exhaust gases being located downstream of the rotor blading when viewed in the flow direction, and wherein said feedback path includes an open-loop control means for controlling the amount of the exhaust gases which pass therethrough.
Claim 3
Dependent Claim
86 words
Apparatus for supercharging an internal combustion engine as defined in claim 1 wherein said open-loop type control circuit includes a function generator which incorporates the amount of the exhaust gases to be passed through said feedback path either as a direct function of instantaneous engine output or as a function of a quantity which varies in direction proportion to instantaneous engine output, and said function generator receives as an input signal the said instantaneous engine output or the said quantity varying with instantaneous engine output, respectively.
Claim 4
Dependent Claim
52 words
Apparatus for supercharging an internal combustion engine as defined in claim 2 and wherein said feedback path further includes a correcting member which receives the output signal from said function generator as a correcting signal and adjusts the amount of the exhaust gas flowing through said path in relation to said signal.
Claim 5
Dependent Claim
21 words
Apparatus for supercharging an internal combustion engine as defined in claim 1 and wherein said feedback path includes a non-return valve.
Claim 6
Dependent Claim
127 words
Apparatus for supercharging an internal combustion engine comprising: a turbo-charger that includes a turbine driven by the exhaust gases from the engine coupled to an air compressor which delivers charging air to the engine, feedback means for introducing a portion of the engine exhaust gases into the flow path of the charging air, the feedback means providing a feedback path terminating at a point within said compressor where the pressure of the charging air is lower than the pressure of the exhaust gases, the point within said compressor for introducing the exhaust gases being located downstream of the rotor blading when viewed in the flow direction, and wherein said feedback path includes a closed-loop control means for controlling the amount of the exhaust gases which pass therethrough.
Claim 7
Dependent Claim
127 words
Apparatus for supercharging an internal combustion engine comprising: a turbo-charger that includes a turbine driven by the exhaust gases from the engine coupled to an air compressor which delivers charging air to the engine, feedback means for introducing a portion of the engine exhaust gases into the flow path of the charging air, the feedback means providing a feedback path terminating at a point within said compressor where the pressure of the charging air is lower than the pressure of the exhaust gases, the point within said compressor for introducing the exhaust gases being located downstream of the rotor blading when viewed in the flow direction, and wherein said feedback path includes a closed-loop control means for controlling the amount of the exhaust gases which pass therethrough.
Claim 8
Dependent Claim
173 words
Apparatus for supercharging an internal combustion engine as defined in claim 5 wherein said closed-loop type control circuit includes a desired value function generator which incorporates the amount of the exhaust gases to be passed through said feedback path either as a direct function of instantaneous engine output or as a function of a quantity which varies in direct proportion to instantaneous engine output, said desired value function generator receiving as an input signal the said instantaneous engine output or the said quantity varying with instantaneous engine output, respectively, a differencing member receiving as inputs thereto the outputs of said desired value function generator and an actual value transmitter which continuously measures the amount of the exhaust gas flowing in said feedback path or the exhaust gas concentration in the air/exhaust mixture and producing an output which is fed to the input of a controller, and a correcting member in said feedback path and which is adjusted by the output from said controller for adjusting the exhaust gas flowthrough in said feedback path.
Claim 9
Dependent Claim
21 words
Apparatus for supercharging an internal combustion engine as defined in claim 5 and wherein said feedback path includes a non-return valve.
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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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |