US6202415B1
Expired / Lapsed
US
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Method and device for monitoring the functioning of two exhaust-gas turbochargers
Assignee: Robert Bosch GmbH
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Filing: 1999-07-16
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Granted: 2001-03-20
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Expires: 2019-07-16
Abstract
Abstract A separate irregular-running determination is carried out for each cylinder bank. Each ascertained irregular-running value is compared to a lower and an upper threshold value, the upper threshold value being set in such a way that all irregular-running values below it are not caused by combustion misses. A defect is signaled in one of the exhaust trains when, for at least one of the two cylinder banks, an irregular-running value is ascertained lying between the lower and the upper threshold value, and the difference between the irregular-running values of the two cylinder banks exceeds a threshold. This method makes it possible to ascertain a defect in one of the two cylinder banks very early.
Inventors
- 👤 Andrea Lohmann
- 👤 Michael Baeuerle
- 👤 Klaus Ries-Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:33
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/007; F02B37/12; F02B37/18; F02D; F02D23/00; F02D41/00; F02D41/0002; F02D41/0007; F02D41/22; F02D41/221; F01; F01N; F01N13/00; F01N13/08; F01N13/10; F01N13/107; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A method for monitoring a functioning of first and second exhaust-gas turbochargers associated with first and second separate cylinder banks, respectively, of an internal combustion engine, comprising the steps of: determining first and second irregular-running values for the first and second cylinder banks, respectively; comparing each of the first and second irregular-running values to a predetermined lower threshold value and a predetermined upper threshold value, the upper threshold value being predetermined such that all irregular-running values less than the upper threshold value are not caused by combustion misses; indicating a defect in an exhaust train when (a) at least one of the first and second irregular-running values lies between the lower and upper threshold values, and (b) a difference between the first and second irregular-running values exceeds a difference threshold value.
Claim 2
Independent Claim
131 words
A method for monitoring a functioning of first and second exhaust-gas turbochargers associated with first and second separate cylinder banks, respectively, of an internal combustion engine, comprising the steps of: determining first and second irregular-running values for the first and second cylinder banks, respectively; comparing each of the first and second irregular-running values to a predetermined lower threshold value and a predetermined upper threshold value, the upper threshold value being predetermined such that all irregular-running values less than the upper threshold value are not caused by combustion misses; indicating a defect in an exhaust train when (a) at least one of the first and second irregular-running values lies between the lower and upper threshold values, and (b) a difference between the first and second irregular-running values exceeds a difference threshold value.
Claim 3
Dependent Claim
43 words
The method according to claim 1 , further comprising the step of determining first and second average irregular-running values for the first and second cylinder banks, respectively, the first and second average irregular-running values being values averaged over a plurality of ignition cycles.
Claim 4
Dependent Claim
42 words
The method according to claim 1 , wherein the defect is indicated when one of the first and second irregular-running values lies between the lower and upper threshold values and is greater than another one of the first and second irregular-running values.
Claim 5
Dependent Claim
62 words
The method according to claim 1 , further comprising the steps of: comparing, to one another, signals from two lambda probes situated in exhaust channels of the first and second cylinder banks; and using an amount of deviation between the two lambda-probe signals exceeding a further threshold value as a plausibility criterion for a detected defect in one of two exhaust trains.
Claim 6
Independent Claim
137 words
A device for monitoring a functioning of first and second exhaust-gas turbochargers associated with first and second cylinder banks, respectively, of an internal combustion engine, comprising: means for separately determining first and second irregular-running values for the first and second cylinder banks, respectively; threshold-value decision elements for comparing each of the first and second irregular-running values to a predetermined lower threshold value and a predetermined upper threshold value, the upper threshold value being predetermined such that all irregular-running values less than the upper threshold value are not caused by combustion misses; and a comparator for comparing the first irregular-running value lying between the lower and upper threshold values to the second irregular-running value and for indicating a defect in an exhaust train when a difference between the first and second irregular-running values exceeds a difference threshold value.
Claim 7
Independent Claim
137 words
A device for monitoring a functioning of first and second exhaust-gas turbochargers associated with first and second cylinder banks, respectively, of an internal combustion engine, comprising: means for separately determining first and second irregular-running values for the first and second cylinder banks, respectively; threshold-value decision elements for comparing each of the first and second irregular-running values to a predetermined lower threshold value and a predetermined upper threshold value, the upper threshold value being predetermined such that all irregular-running values less than the upper threshold value are not caused by combustion misses; and a comparator for comparing the first irregular-running value lying between the lower and upper threshold values to the second irregular-running value and for indicating a defect in an exhaust train when a difference between the first and second irregular-running values exceeds a difference threshold value.
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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) | 2004-03-19 | 2004-09-18 | 2005-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-19 | 2008-09-18 | 2009-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-19 | 2012-09-18 | 2013-03-20 | $7700.00 | Window Closed / Lapsed |