US5791319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling an exhaust gas recirculation device in an internal combustion engine
Assignee: Aumovio Germany GmbH
•
Filing: 1997-01-31
•
Granted: 1998-08-11
•
Expires: 2017-01-31
Abstract
Abstract A method for controlling an exhaust gas recirculation device in an internal combustion engine includes calculating an actual value of an exhaust gas recirculation rate from a current air flow rate measured by an air flow rate meter and a theoretical air flow rate that would result without exhaust gas recirculation. A difference is formed from a desired value stored as a function of load and from the actual value for the exhaust gas recirculation rate. The difference is supplied to a controller which triggers an exhaust gas recirculation valve in such a way that a desired value of the exhaust gas recirculation rate is established.
Inventors
- 👤 Arno Friedrich
- 👤 Klaus Wenzlawski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:25
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/0072; F02D41/02; F02D41/18; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
A method for controlling the exhaust gas recirculation rate of an internal combustion engine operating with an exhaust gas recirculation system, which comprises: connecting an exhaust tract of an engine to an intake tract of the engine with an exhaust gas recirculation line having an opening cross section and a controllable exhaust gas recirculation valve influencing the opening cross section; calculating a theoretical air flow rate value which would be supplied to the engine at a particular time if no exhaust gas recirculation were active; correcting the air flow rate value by a correction factor as a function of an operating point in accordance with a current degree of delivery; calculating an actual value for the exhaust gas recirculation rate from the corrected theoretical air flow rate value and from the actual value of the air flow rate; storing desired values for the exhaust gas recirculation rate in % as a function of the operating point; forming a difference from the desired value and the actual value of the exhaust gas recirculation rate; and supplying the difference to a control device triggering the exhaust gas recirculation valve for adjusting a desired value of the exhaust gas recirculation rate.
Claim 2
Independent Claim
198 words
A method for controlling the exhaust gas recirculation rate of an internal combustion engine operating with an exhaust gas recirculation system, which comprises: connecting an exhaust tract of an engine to an intake tract of the engine with an exhaust gas recirculation line having an opening cross section and a controllable exhaust gas recirculation valve influencing the opening cross section; calculating a theoretical air flow rate value which would be supplied to the engine at a particular time if no exhaust gas recirculation were active; correcting the air flow rate value by a correction factor as a function of an operating point in accordance with a current degree of delivery; calculating an actual value for the exhaust gas recirculation rate from the corrected theoretical air flow rate value and from the actual value of the air flow rate; storing desired values for the exhaust gas recirculation rate in % as a function of the operating point; forming a difference from the desired value and the actual value of the exhaust gas recirculation rate; and supplying the difference to a control device triggering the exhaust gas recirculation valve for adjusting a desired value of the exhaust gas recirculation rate.
Claim 3
Dependent Claim
35 words
The method according to claim 1, which comprises calculating the theoretical air flow rate LMB with a general gas equation: ##EQU4## in which: PL=charge pressure; VH=cylinder stroke volume; TPL=charge air temperature (absolute); and R=gas constant.
Claim 4
Dependent Claim
34 words
The method according to claim 1, which comprises ascertaining the theoretical air flow rate from a number of performance graphs determined as a function of the engine operating point, intake pressure and intake temperature.
Claim 5
Dependent Claim
36 words
The method according to claim 1, which comprises operating the control device with proportional behavior with the difference, and furnishing a controlled variable for the exhaust gas recirculation valve at an output of the control device.
Claim 6
Dependent Claim
36 words
The method according to claim 1, which comprises operating the control device with proportional/integral behavior with the difference, and furnishing a controlled variable for the exhaust gas recirculation valve at an output of the control device.
Claim 7
Dependent Claim
37 words
The method according to claim 1, which comprises storing the desired value for the exhaust gas recirculation rate in a performance graph as a function of at least one of coolant temperature, ambient temperature and ambient pressure.
Claim 8
Dependent Claim
44 words
The method according to claim 1, which comprises calculating the actual value for the exhaust gas recirculation rate AGR -- IST with the following equation: AGR.sub.-- IST=(1-LM.sub.-- IST/LMB)*100 in which: LMB=theoretical air flow rate value; and LM -- IST=actual value of air flow rate.
Claim 9
Independent Claim
191 words
A method for controlling the exhaust gas recirculation rate of an internal combustion engine operating with an exhaust gas recirculation system, which comprises: connecting an exhaust tract of an engine to an intake tract of the engine with an exhaust gas recirculation line having an opening cross section and a controllable exhaust gas recirculation valve influencing the opening cross section; calculating a theoretical air flow rate value which would be supplied to the engine at a particular time if no exhaust gas recirculation were active; correcting the air flow rate value by a correction factor as a function of an operating point in accordance with a current degree of delivery; storing desired values for the exhaust gas recirculation rate in % as a function of the operating point; calculating a desired value for the air flow rate from the corrected theoretical air flow rate value and from the desired value; forming a difference from the desired value and the actual value of the air flow rate; and supplying the difference to a control device, triggering the exhaust gas recirculation valve for adjusting the desired value of the exhaust gas recirculation rate.
Claim 10
Independent Claim
191 words
A method for controlling the exhaust gas recirculation rate of an internal combustion engine operating with an exhaust gas recirculation system, which comprises: connecting an exhaust tract of an engine to an intake tract of the engine with an exhaust gas recirculation line having an opening cross section and a controllable exhaust gas recirculation valve influencing the opening cross section; calculating a theoretical air flow rate value which would be supplied to the engine at a particular time if no exhaust gas recirculation were active; correcting the air flow rate value by a correction factor as a function of an operating point in accordance with a current degree of delivery; storing desired values for the exhaust gas recirculation rate in % as a function of the operating point; calculating a desired value for the air flow rate from the corrected theoretical air flow rate value and from the desired value; forming a difference from the desired value and the actual value of the air flow rate; and supplying the difference to a control device, triggering the exhaust gas recirculation valve for adjusting the desired value of the exhaust gas recirculation rate.
Claim 11
Dependent Claim
35 words
The method according to claim 8, which comprises calculating the theoretical air flow rate LMB with a general gas equation: ##EQU5## in which: PL=charge pressure; VH=cylinder stroke volume; TPL=charge air temperature (absolute); and R=gas constant.
Claim 12
Dependent Claim
34 words
The method according to claim 8, which comprises ascertaining the theoretical air flow rate from a number of performance graphs determined as a function of the engine operating point, intake pressure and intake temperature.
Claim 13
Dependent Claim
36 words
The method according to claim 8, which comprises operating the control device with proportional behavior with the difference, and furnishing a controlled variable for the exhaust gas recirculation valve at an output of the control device.
Claim 14
Dependent Claim
36 words
The method according to claim 8, which comprises operating the control device with proportional/integral behavior with the difference, and furnishing a controlled variable for the exhaust gas recirculation valve at an output of the control device.
Claim 15
Dependent Claim
37 words
The method according to claim 8, which comprises storing the desired value for the exhaust gas recirculation rate in a performance graph as a function of at least one of coolant temperature, ambient temperature and ambient pressure.
Claim 16
Dependent Claim
41 words
The method according to claim 8, which comprises calculating the desired value for the air flow rate LM -- SOLL with the following equation: LM.sub.-- SOLL=LMB*(100%-AGR.sub.-- SOLL) in which: LMB=theoretical air flow rate value; and AGR -- SOLL=exhaust gas recirculation rate.
References Cited (Backward Citations)
DE3145527A1
Cited
US4467775A
Cited
US5261373A
Cited
US5205260A
Cited
US5377651A
Cited
US5515833A
Cited
DE19502368A1
Cited
US5619974A
Cited
US5601068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |