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US 6,202,412 B1Granted
Method and apparatus for fault recognition in an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsThomas Lange, Guenter Driedger, Bruno-Hans Dieners, Peter Lutz
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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.
Claims14
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.
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.
1 more element
Dependencies are inferred from the claim text.