US5174119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling the boost pressure in an internal-combustion engine supercharged by an exhaust-gas turbocharger of adjustable turbine geometry
Assignee: Mercedes Benz Group AG
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Filing: 1991-08-15
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Granted: 1992-12-29
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Expires: 2011-08-15
Abstract
Abstract A process for adjusting the boost pressure in an internal-combustion engine, supercharged by an exhaust-gas turbocharger with adjustable turbine diffuser, to a predetermined desired boost-pressure value dependent on the operating point. To improve the efficiency of the internal-combustion engine in the non-steady-state mode, especially after a positive load change out of low load and speed ranges, or, after a positive load change during the non-stead-state mode, below a predetermined threshold value for the exhaust-gas counterpressure upstream of the turbine the boost pressure is regulated according to a first characteristic corresponding to the instantaneous true deviation of the actual boost-pressure value from the desired boost-pressure value. After this threshold value has been exceeded, the exhaust-gas counterpressure is regulated predetermining hypothetical control deviations for the boost-pressure control circuit according to a special characteristic.
Inventors
- 👤 Horst Hanauer
- 👤 Michael Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:59
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1448; F02B; F02B37/00; F02B37/12; F02B37/24; F02D41/0002; F02D41/0007; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
A process for controlling the boost pressure in an internal-combustion engine, supercharged by an exhaust-gas turbocharger with adjustable turbine diffuser, to a predetermined desired boost-pressure value dependent on the operating point, comprising: after a positive change of the internal-combustion engine load, transferring the turbine diffuser into a position reducing a flow cross-section onto the turbine; after the positive load change during a non-steady-state mode, regulating boost pressure according to a first characteristic, corresponding to the instantaneous true deviation of the actual boost-pressure value from the desired boost-pressure value, for the regulating variable for controlling the turbine diffuser, the regulation of the boost pressure taking place according to the first characteristic only below a predetermined threshold value for the exhaust-gas counterpressure upstream of the turbine; and after the predetermined threshold value has been exceeded, regulating the boost pressure according to a second characteristic, the second characteristic being based on a hypothetical deviation of the actual boost-pressure value from the desired boost-pressure value, the amount of which is larger than the instantaneous true deviation.
Claim 2
Dependent Claim
172 words
A process for controlling the boost pressure in an internal-combustion engine, supercharged by an exhaust-gas turbocharger with adjustable turbine diffuser, to a predetermined desired boost-pressure value dependent on the operating point, comprising: after a positive change of the internal-combustion engine load, transferring the turbine diffuser into a position reducing a flow cross-section onto the turbine; after the positive load change during a non-steady-state mode, regulating boost pressure according to a first characteristic, corresponding to the instantaneous true deviation of the actual boost-pressure value from the desired boost-pressure value, for the regulating variable for controlling the turbine diffuser, the regulation of the boost pressure taking place according to the first characteristic only below a predetermined threshold value for the exhaust-gas counterpressure upstream of the turbine; and after the predetermined threshold value has been exceeded, regulating the boost pressure according to a second characteristic, the second characteristic being based on a hypothetical deviation of the actual boost-pressure value from the desired boost-pressure value, the amount of which is larger than the instantaneous true deviation.
Claim 3
Dependent Claim
24 words
Process according to claim 1, wherein the second characteristic is determined as a function of at least one operating parameter of the internal-combustion engine.
Claim 4
Dependent Claim
42 words
Process according to claim 2, wherein the operating parameters for determining the second characteristic are at least one of: a pressure-rise change in a supercharging-air line; internal combustion engine speed; a time change of the internal-combustion engine speed; and a coolant temperature.
References Cited (Backward Citations)
US2944786A
Cited
DE2813638A1
Cited
JPS58176417A
Cited
JPS6056127A
Cited
DE3506303A1
Cited
US4765141A
Cited
DE3507095A1
Cited
DE3515046A1
Cited
GB2169349A
Cited
JPS62182437A
Cited
JPS62210222A
Cited
DE3624248A1
Cited
US4773225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |