US6934621B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Re-entry strategy from boost mode to EGR mode
Assignee: Detroit Diesel Corp
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Filing: 2003-07-25
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Granted: 2005-08-23
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Expires: 2023-07-25
Abstract
Abstract A control for an internal combustion engine that includes an exhaust gas recirculation system predicts at least one of the intake manifold temperature in EGR mode or an intake manifold pressure in EGR mode, but preferably both, during Boost mode operation. The predictions are relied upon to calculate an intake manifold critical temperate in EGR, at which condensation would occur. The control then compares the predicted temperate value with the calculated intake manifold critical temperature, and if the predicted value exceeds the calculated temperature, the control commands re-entry into exhaust gas recirculation mode.
Inventors
- 👤 Sameer Bhargava
- 👤 Ravishankar Ramamurthy
- 👤 Brian A. Lewallen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0002; F02D41/0007; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/25; F02M26/45; F02M26/46; F02M26/47; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02D2200/0408; F02D2200/0414; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
113 words
A method for controlling exhaust gas recirculation of an internal combustion engine comprising: determining a condition during engine operation in EGR mode at which an intake manifold temperature is below an intake manifold critical temperature at which condensation occurs in said intake manifold; switching to a boost mode in response to said determining; predicting a value of at least one of intake manifold temperature and intake manifold pressure if the engine were operated in EGR mode; calculating an intake manifold critical temperature as a function of said predicting a value; and switching to exhaust gas recirculation mode when said predicted intake manifold temperature in EGR mode exceeds said calculated intake manifold critical temperature.
Claim 2
Independent Claim
113 words
A method for controlling exhaust gas recirculation of an internal combustion engine comprising: determining a condition during engine operation in EGR mode at which an intake manifold temperature is below an intake manifold critical temperature at which condensation occurs in said intake manifold; switching to a boost mode in response to said determining; predicting a value of at least one of intake manifold temperature and intake manifold pressure if the engine were operated in EGR mode; calculating an intake manifold critical temperature as a function of said predicting a value; and switching to exhaust gas recirculation mode when said predicted intake manifold temperature in EGR mode exceeds said calculated intake manifold critical temperature.
Claim 3
Dependent Claim
33 words
The invention as described in claim 1 wherein said predicting comprises measuring a value of said at least one of intake manifold pressure and intake manifold temperature during engine operation in Boost mode.
Claim 4
Dependent Claim
44 words
The invention as described in claim 2 wherein said predicting comprises adjusting said measured value of said at least one of intake manifold temperature and intake manifold pressure with a differential determined by a difference in measurement at Boost mode and at EGR mode.
Claim 5
Dependent Claim
36 words
The invention as described in claim 3 wherein said adjusting comprises selecting an adjustment value from a table of empirically determined values of said at least one of said intake manifold temperature and intake manifold pressure.
Claim 6
Dependent Claim
21 words
The invention as described in claim 4 wherein said table is generated as a function of engine load and engine speed.
Claim 7
Dependent Claim
31 words
The invention as described in claim 5 wherein said empirically determined values comprises a temperature or pressure reading in EGR mode less a temperature or pressure reading, respectively, in boost mode.
Claim 8
Dependent Claim
118 words
A computer readable storage medium having data stored therein representing instructions executable by a computer to control a compression ignition internal combustion engine installed in a vehicle to perform an exhaust gas recirculation re-entry from a boost mode operation, the computer readable storage medium comprising: instructions for predicting a value of at least one of intake manifold temperature and intake manifold pressure in EGR mode from a measurement taken in Boost mode; instructions for calculating an intake manifold critical temperature in EGR mode as a function of said predicted value; and instructions for switching to exhaust gas recirculation mode when said predicted intake manifold temperature in EGR mode exceeds said calculated intake manifold critical temperature in EGR mode.
Claim 9
Dependent Claim
118 words
A computer readable storage medium having data stored therein representing instructions executable by a computer to control a compression ignition internal combustion engine installed in a vehicle to perform an exhaust gas recirculation re-entry from a boost mode operation, the computer readable storage medium comprising: instructions for predicting a value of at least one of intake manifold temperature and intake manifold pressure in EGR mode from a measurement taken in Boost mode; instructions for calculating an intake manifold critical temperature in EGR mode as a function of said predicted value; and instructions for switching to exhaust gas recirculation mode when said predicted intake manifold temperature in EGR mode exceeds said calculated intake manifold critical temperature in EGR mode.
Claim 10
Dependent Claim
30 words
The invention as described in claim 7 wherein said instructions for predicting comprises predicting each of said intake manifold temperature in EGR mode and intake manifold pressure in EGR mode.
Claim 11
Dependent Claim
35 words
The invention as described in claim 7 wherein said instructions for predicting include instructions for adjusting a measured value in Boost mode with a differential established as a function of engine speed and engine load.
Claim 12
Dependent Claim
45 words
The invention as described in claim 8 wherein said instructions for calculating include an equation determining intake manifold critical temperature in Boost mode as a function of both said predicted intake manifold temperature in EGR mode and said predicted intake manifold pressure in EGR mode.
Claim 13
Dependent Claim
14 words
The invention as described in claim 10 wherein said equation is a linear equation.
Claim 14
Independent Claim
101 words
A system for controlling a compression ignition internal combustion engine in a vehicle with expedited re-entry to an exhaust gas recirculation operating mode from a boost mode operation comprising: a monitor for determining boost mode operation; a processor for predicting a value of at least one of intake manifold temperature and intake manifold pressure as a function of measuring said at least one in Boost mode; calculating an intake manifold critical temperature as a function of said predicting a value; and a controller for switching to exhaust gas recirculation mode when said predicted temperature exceeds said calculated intake manifold critical temperature.
Claim 15
Independent Claim
101 words
A system for controlling a compression ignition internal combustion engine in a vehicle with expedited re-entry to an exhaust gas recirculation operating mode from a boost mode operation comprising: a monitor for determining boost mode operation; a processor for predicting a value of at least one of intake manifold temperature and intake manifold pressure as a function of measuring said at least one in Boost mode; calculating an intake manifold critical temperature as a function of said predicting a value; and a controller for switching to exhaust gas recirculation mode when said predicted temperature exceeds said calculated intake manifold critical temperature.
Claim 16
Dependent Claim
36 words
The invention as described in claim 12 wherein said system comprises a sensor for measuring said at least one of intake manifold temperature and intake manifold pressure in said Boost mode to provide a measured value.
Claim 17
Dependent Claim
26 words
The invention as described in claim 12 wherein said processor comprises a compensator for adjusting said measured value to an adjusted value representing EGR mode operation.
Claim 18
Dependent Claim
16 words
The invention as described in claim 14 wherein said compensator comprises at least one look-up table.
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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) | 2008-08-22 | 2009-02-21 | 2009-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-08-22 | 2013-02-21 | 2013-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-08-22 | 2017-02-21 | 2017-08-23 | $7700.00 | Window Closed / Lapsed |