US6250145B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operationally testing an exhaust gas turbocharger having a variable turbine geometry
Assignee: Mercedes Benz Group AG
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Filing: 1999-08-20
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Granted: 2001-06-26
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Expires: 2019-08-20
Abstract
Abstract In the case of a method for operationally testing an exhaust gas turbocharger with a variable turbine geometry, actual values are detected of operating quantities which influence the operational capability of the exhaust gas turbocharger and which comprise main quantities which are used for deciding whether a fault exists in the exhaust gas turbocharger, as well as auxiliary quantities which describe a component of the exhaust gas turbocharger and are used for identifying faults in this component. In a first step, for fault detection, a quantity is measured as the main quantity which determines the engine air supply. In a second step, at least one auxiliary quantity is measured for the fault identification and, in the event of an unacceptable deviation of the actual auxiliary quantity value from the desired auxiliary quantity value, a fault signal is generated.
Inventors
- 👤 Martin Honold
- 👤 Erwin Schmidt
- 👤 Siegfried Sumser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:17
CPC Classifications
F; F02; F02B; F02B39/00; F02B39/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
169 words
A method for operationally testing an exhaust gas turbocharger having a variable turbine geometry for adjusting an effective turbine cross-section, in which actual values of operating quantities influencing operation of the exhaust gas turbocharger are detected, which values comprise main quantities used for deciding whether a fault is present in the exhaust gas turbocharger, as well as auxiliary quantities describing a component of the exhaust gas turbocharger and used for identifying the fault of the component, the method comprising the acts of: first measuring a quantity determining an engine air supply as a main quantity in order to detect the fault; and secondly, measuring at least one auxiliary quantity if a fault is detected to identify the fault; and generating a fault signal in an event of an unacceptable deviation of an actually measured auxiliary quantity value from a desired auxiliary quantity value, wherein a position of an adjusting element by which the variable turbine geometry is adjustable is measured as one of said at least one auxiliary quantity.
Claim 2
Independent Claim
169 words
A method for operationally testing an exhaust gas turbocharger having a variable turbine geometry for adjusting an effective turbine cross-section, in which actual values of operating quantities influencing operation of the exhaust gas turbocharger are detected, which values comprise main quantities used for deciding whether a fault is present in the exhaust gas turbocharger, as well as auxiliary quantities describing a component of the exhaust gas turbocharger and used for identifying the fault of the component, the method comprising the acts of: first measuring a quantity determining an engine air supply as a main quantity in order to detect the fault; and secondly, measuring at least one auxiliary quantity if a fault is detected to identify the fault; and generating a fault signal in an event of an unacceptable deviation of an actually measured auxiliary quantity value from a desired auxiliary quantity value, wherein a position of an adjusting element by which the variable turbine geometry is adjustable is measured as one of said at least one auxiliary quantity.
Claim 3
Dependent Claim
19 words
The method according to claim 1 , wherein the act of measuring the main quantity measures a supercharging pressure.
Claim 4
Dependent Claim
20 words
The method according to claim 1 , wherein the act of measuring the main quantity measures an air flow rate.
Claim 5
Dependent Claim
24 words
The method according to claim 1 , further comprising the act of measuring temperature of the engine air supply as an additional main quantity.
Claim 6
Dependent Claim
21 words
The method according to claim 1 , further comprising the act of measuring an engine rotational speed as another main quantity.
Claim 7
Dependent Claim
22 words
The method according to claim 1 , further comprising the act of factoring into account an engine load as another main quantity.
Claim 8
Dependent Claim
33 words
The method according to claim 1 , wherein a time period starting with a beginning of an engine braking operation or of a fired operation is factored into account as another main quantity.
Claim 9
Dependent Claim
37 words
The method according to claim 1 , wherein the act of measuring at least one auxiliary quantity measures an end position of axially displaceable turbine guide baffles serving as the adjusting element of the variable turbine geometry.
Claim 10
Dependent Claim
38 words
The method according to claim 1 , wherein the act of measuring the at least one auxiliary quantity measures a rotating position of rotary blades of guide baffles serving as the adjusting element of the variable turbine geometry.
Claim 11
Dependent Claim
31 words
The method according to claim 1 , wherein the act of measuring the at least one auxiliary quantity measures an actual position of a braking flap of the variable turbine geometry.
Claim 12
Dependent Claim
33 words
The method according to claim 1 , wherein the act of measuring the at least one auxiliary quantity factors into account a blow-off cross-section of a blow-off valve as an additional auxiliary quantity.
Claim 13
Dependent Claim
63 words
The method according to claim 1 , wherein by measuring additional auxiliary quantities, operation of at least one of the following components is detected: an injection pump, an injection nozzle, a fuel supply pump, fuel supply pipes, a compressor wheel, a turbine wheel, a bearing of the exhaust gas turbocharger, a constant throttle valve, and a hydraulic control of the constant throttle valve.
Claim 14
Dependent Claim
22 words
The method according to claim 1 , wherein operational testing is carried out during a continuous operation of the exhaust gas turbocharger.
Claim 15
Dependent Claim
31 words
The method according to claim 13 , wherein a supercharging pressure and a rotational engine speed are measured as main quantities in an engine braking operation of the exhaust gas turbocharger.
Claim 16
Dependent Claim
33 words
The method according to claim 13 , wherein a supercharging pressure, a rotational engine speed, and an engine load are measured as main quantities in a fired operation of the exhaust gas turbocharger.
Claim 17
Dependent Claim
33 words
The method according to claim 14 , wherein a supercharging pressure, a rotational engine speed, and an engine load are measured as main quantities in a fired operation of the exhaust gas turbocharger.
Claim 18
Dependent Claim
15 words
The method according to claim 13 , wherein operational testing occurs at regular time intervals.
Claim 19
Dependent Claim
19 words
The method according to claim 1 , wherein deviations of actually measured values from desired values are electronically documented.
Claim 20
Dependent Claim
19 words
The method according to claim 13 , wherein deviations of actually measured values from desired values are electronically documented.
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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) | 2004-06-25 | 2004-12-25 | 2005-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-06-25 | 2008-12-25 | 2009-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-06-25 | 2012-12-25 | 2013-06-26 | $7700.00 | Window Closed / Lapsed |