Patent US5174119A successfully refreshed from Google Patents.
US5174119A
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US
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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 09:47
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.
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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) | 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 |