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US 12,044,188 B2Granted
Leak diagnosis for an intake system
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsDaniel Alberer, Andreas Kerschbaummayr, Andreas Leyrer, Bernhard Ramsebner, Martin Ranzmaier
Life of this patent
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Abstract
A vehicle drive has an internal combustion engine, an air conduit system, an exhaust system and a diagnostic unit for identifying a leak in the air conduit system of the internal combustion engine. The diagnostic unit is designed to carry out a method for diagnosing a leak in an internal combustion engine, including by determining mass flows in the air conduit system, and identifying a leakage mass flow.
Claims9
A method for diagnosing a leakage of an internal combustion engine, comprising:
- determining regular mass flows ({dot over (m)}EGR, {dot over (m)}charge, {dot over (m)}ThrVlv) of an air conduit of the internal combustion engine;
- establishing a mass flow balance on the basis of the determined regular mass flows;
- ascertaining a leakage mass flow ({dot over (m)}leak) on the basis of the established mass flow balance;
- ascertaining a position and/or a size (Aleak, dleak) of a leak depending on the ascertained leakage mass flow;
- (i) ascertaining a positive-pressure leakage mass flow ({dot over (m)}leak) and a positive-pressure size characteristic value (Aleak,pos, dleak,pos) depending on an ascertained positive-pressure leakage mass flow;
- and/or
- (ii) ascertaining a negative-pressure leakage mass flow (−{dot over (m)}leak) and a negative-pressure size characteristic value (Aleak,neg, dleak,neg) depending on an ascertained negative-pressure leakage mass flow;
- and
- determining a position of the leak depending on a ratio of the ascertained positive-pressure size characteristic value to the ascertained negative-pressure size characteristic value.
6 more elements
An apparatus, comprising:
- a diagnostic unit for identifying a leakage of an air conduit of an internal combustion engine, wherein the diagnostic unit is operatively configured to:
- determine regular mass flows ({dot over (m)}EGR, {dot over (m)}charge, {dot over (m)}ThrVlv) of an air conduit of the internal combustion engine;
- establish a mass flow balance on the basis of the determined regular mass flows;
- ascertain a leakage mass flow ({dot over (m)}leak) on the basis of the established mass flow balance;
- ascertain a position and/or a size (Aleak, dleak) of a leak depending on the ascertained leakage mass flow;
- (i) ascertain a positive-pressure leakage mass flow ({dot over (m)}leak) and a positive-pressure size characteristic value (Aleak,pos, dleak,pos) depending on an ascertained positive-pressure leakage mass flow;
- and/or
- (ii) ascertain a negative-pressure leakage mass flow (−{dot over (m)}leak) and a negative-pressure size characteristic value (Aleak,neg, dleak,neg) depending on an ascertained negative-pressure leakage mass flow;
- and
- determine a position of the leak depending on a ratio of the ascertained positive-pressure size characteristic value to the ascertained negative-pressure size characteristic value.
7 more elements
Dependencies are inferred from the claim text.