US6202412B1
Expired / Lapsed
US
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Method and apparatus for fault recognition in an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1997-09-29
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Granted: 2001-03-20
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Expires: 2017-09-29
Abstract
Abstract A method and apparatus for fault recognition in an internal combustion engine, such as an auto-ignition internal combustion engine. A defect in the metering system is recognized if the boost pressure deviates from an expected value.
Inventors
- 👤 Thomas Lange
- 👤 Guenter Driedger
- 👤 Bruno-Hans Dieners
- 👤 Peter Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/3809; F02D41/22; F02D41/221; F02D2041/224; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02D41/0002; F02D41/0007
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
A method for monitoring an operating condition of an internal combustion engine, comprising the steps of: measuring an intake duct boost pressure of a fuel metering system of the internal combustion engine; and detecting a fault in the fuel metering system only if a fuel quantity to be injected is 0 and if at least one of i) a measured value of the boost pressure is greater than a predetermined value, and ii) the measured value rises at a rate greater than a predetermined rate.
Claim 2
Independent Claim
85 words
A method for monitoring an operating condition of an internal combustion engine, comprising the steps of: measuring an intake duct boost pressure of a fuel metering system of the internal combustion engine; and detecting a fault in the fuel metering system only if a fuel quantity to be injected is 0 and if at least one of i) a measured value of the boost pressure is greater than a predetermined value, and ii) the measured value rises at a rate greater than a predetermined rate.
Claim 3
Dependent Claim
16 words
The method according to claim 1 , wherein the predetermined value is a definable threshold value.
Claim 4
Dependent Claim
43 words
The method according to claim 2 , further comprising the step of: determining the definable threshold value as a function of at least one triggering signal, the at least one triggering signal being applied to an actuator, the actuator influencing the boost pressure.
Claim 5
Dependent Claim
45 words
The method according to claim 1 , further comprising the step of: determining the predetermined rate as a function of at least one of a speed of the internal combustion engine and a triggering signal applied to an actuator, the actuator influencing the boost pressure.
Claim 6
Dependent Claim
25 words
The method according to claim 1 , further comprising the steps of: detecting the fault when the internal combustion engine is in a coasting mode.
Claim 7
Dependent Claim
31 words
The method according to claim 1 , further comprising the step of: when the fault is detected, initiating predetermined fault actions to reduce a power output of the internal combustion engine.
Claim 8
Dependent Claim
18 words
The method according to claim 1 , wherein the internal combustion engine includes an auto-ignition internal combustion engine.
Claim 9
Independent Claim
89 words
An apparatus for recognizing a fault in an internal combustion engine, comprising: a boost pressure sensor measuring an intake duct boost pressure of a fuel metering system of the internal combustion engine; and a control system connected to the boost pressure sensor, wherein, when a fuel is cut off, the control system detects the fault in the fuel metering system if at least one of i) the boost pressure is greater than a predetermined value, and ii) the boost pressure rises at a rate greater than a predetermined rate.
Claim 10
Independent Claim
89 words
An apparatus for recognizing a fault in an internal combustion engine, comprising: a boost pressure sensor measuring an intake duct boost pressure of a fuel metering system of the internal combustion engine; and a control system connected to the boost pressure sensor, wherein, when a fuel is cut off, the control system detects the fault in the fuel metering system if at least one of i) the boost pressure is greater than a predetermined value, and ii) the boost pressure rises at a rate greater than a predetermined rate.
Claim 11
Dependent Claim
16 words
The apparatus according to claim 8 , wherein the predetermined value is a definable threshold value.
Claim 12
Dependent Claim
40 words
The apparatus according to claim 9 , wherein the definable threshold value is defined as a function of at least one triggering signal, the at least one triggering signal being applied to an actuator, the actuator influencing the boost pressure.
Claim 13
Dependent Claim
42 words
The apparatus according to claim 8 , wherein the predetermined rate is determined as a function of at least one of a speed of the internal combustion engine and a triggering signal applied to an actuator, the actuator influencing the boost pressure.
Claim 14
Dependent Claim
22 words
The apparatus according to claim 8 , wherein the fault is detected when the internal combustion engine is in a coasting mode.
Claim 15
Dependent Claim
28 words
The apparatus according to claim 8 , wherein, when the fault is detected, predetermined fault actions are initiated to reduce a power output of the internal combustion engine.
Claim 16
Dependent Claim
18 words
The apparatus according to claim 8 , wherein the internal combustion engine includes an auto-ignition internal combustion engine.
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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 |