Patent US6698203B2 successfully refreshed from Google Patents.
US6698203B2
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System for estimating absolute boost pressure in a turbocharged internal combustion engine
Assignee: Cummins Inc
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Filing: 2002-03-19
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Granted: 2004-03-02
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Expires: 2022-03-19
Abstract
Abstract A system for estimating absolute boost pressure in a turbocharged internal combustion engine includes a pressure sensor producing a pressure signal indicative of the pressure of air entering a turbocharger compressor inlet, a temperature sensor producing a temperature signal indicative of the temperature entering the compressor inlet, a first speed sensor producing a first speed signal indicative of the rotational speed of the turbocharger, a second speed sensor producing a second speed signal indicative of the rotational speed of the engine, and a control computer estimating the absolute boost pressure as a function of the pressure signal, the temperature signal, the first speed signal and the second speed signal.
Inventors
- 👤 Yue Yun Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:44
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/12; F02B37/24; F02B29/00; F02B29/04; F02B29/0406; F02D; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02D2200/0408; F02D2200/0414; F02D2200/70; F02D2200/703; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/13; F02M26/22; F02M26/23; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
System for estimating absolute boost pressure in a turbocharged internal combustion engine, comprising: a turbocharger having a compressor defining a inlet and an outlet fluidly coupled via an intake conduit to an intake manifold of an internal combustion engine; a pressure sensor producing a pressure signal indicative of pressure of air entering said compressor inlet; a temperature sensor producing a temperature signal indicative of temperature of air entering said compressor inlet; a first speed sensor producing a first speed signal indicative of engine rotational speed; a second speed sensor producing a second speed signal indicative of rotational speed of said turbocharger; and a control computer estimating absolute boost pressure within said intake conduit as a function of said first and second speed, pressure and temperature signals.
Claim 2
Dependent Claim
126 words
System for estimating absolute boost pressure in a turbocharged internal combustion engine, comprising: a turbocharger having a compressor defining a inlet and an outlet fluidly coupled via an intake conduit to an intake manifold of an internal combustion engine; a pressure sensor producing a pressure signal indicative of pressure of air entering said compressor inlet; a temperature sensor producing a temperature signal indicative of temperature of air entering said compressor inlet; a first speed sensor producing a first speed signal indicative of engine rotational speed; a second speed sensor producing a second speed signal indicative of rotational speed of said turbocharger; and a control computer estimating absolute boost pressure within said intake conduit as a function of said first and second speed, pressure and temperature signals.
Claim 3
Dependent Claim
33 words
The system of claim 1 wherein said control computer is operable to compute a temperature-corrected turbocharger speed as a ratio of said second speed signal and a square root of said temperature signal.
Claim 4
Dependent Claim
107 words
The system of claim 2 further including a memory having a three-dimensional map stored therein, said map having a first dimension defined by a ratio of said absolute boost pressure and said pressure of air entering said compressor inlet, a second dimension defined by said temperature-corrected turbocharger speed and a third dimension defined by said engine rotational speed; and wherein said control computer is operable to estimate said absolute boost pressure within said intake conduit by mapping current values of said temperature-corrected turbocharger speed, said first speed signal and said pressure signal to corresponding values of said absolute boost pressure via said map stored within said memory.
Claim 5
Dependent Claim
96 words
The system of claim 1 wherein said control computer includes: means for determining a temperature value as a square root of said temperature signal; means for determining a temperature-corrected turbocharger speed value as a ratio of said second speed signal and said temperature value; means responsive to said temperature-corrected turbocharger speed value for determining a first function thereof; means responsive to said speed signal for determining a second function thereof; and means for estimating said absolute boost pressure within said intake conduit as a product of said first function, said second function and said pressure signal.
Claim 6
Independent Claim
110 words
A method of estimating absolute boost pressure in a turbocharged internal combustion engine, the method comprising the steps of: determining an inlet pressure corresponding to pressure of air entering an inlet of a turbocharger compressor; determining an inlet temperature corresponding to temperature of the air entering the inlet of the turbocharger compressor; determining a first speed corresponding to turbocharger rotational speed; determining a second speed corresponding to engine rotational speed; and estimating an absolute boost pressure of air supplied by an outlet of the turbocharger compressor to an intake manifold of the engine as a function of the inlet pressure, the inlet temperature, the first speed and the second speed.
Claim 7
Independent Claim
110 words
A method of estimating absolute boost pressure in a turbocharged internal combustion engine, the method comprising the steps of: determining an inlet pressure corresponding to pressure of air entering an inlet of a turbocharger compressor; determining an inlet temperature corresponding to temperature of the air entering the inlet of the turbocharger compressor; determining a first speed corresponding to turbocharger rotational speed; determining a second speed corresponding to engine rotational speed; and estimating an absolute boost pressure of air supplied by an outlet of the turbocharger compressor to an intake manifold of the engine as a function of the inlet pressure, the inlet temperature, the first speed and the second speed.
Claim 8
Dependent Claim
73 words
The method of claim 5 wherein the estimating step includes: computing a temperature-corrected turbocharger speed as a ratio of the first speed and a square root of the inlet temperature; mapping current values of the temperature-corrected turbocharger speed and the second speed to a compressor pressure ratio using a map stored within a memory unit; and estimating the absolute boost pressure as a product of the compressor pressure ratio and the inlet pressure.
Claim 9
Dependent Claim
67 words
The method of claim 5 wherein the estimating step includes: computing a temperature-corrected turbocharger speed as a ratio of the first speed and a square root of the inlet temperature; determining a first function of the temperature-corrected turbocharger speed; determining a second function of the second speed; and estimating the absolute boost pressure as a product of the first function, the second function and the inlet pressure.
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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) | 2007-03-02 | 2007-09-01 | 2008-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-03-02 | 2011-09-01 | 2012-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-03-02 | 2015-09-01 | 2016-03-02 | $7700.00 | Window Closed / Lapsed |