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AssigneeRobert Bosch GmbH
InventorsPeter Plonka, Alexander Bludau, Benedikt Feldmann, Thomas Steinert, Wolfgang Mueller
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A method for dynamically diagnosing an exhaust gas probe. A target/actual comparison is performed between a calculated O2 signal and an O2 signal measured with the exhaust gas probe, for a step load transition. A device for dynamically diagnosing an exhaust gas probe disposed in an exhaust duct of an internal combustion engine. An output signal is fed to an engine controller connected to additional input signals providing information about intake air mass and fuel metering. The engine controller comprises devices for determining a calculated O2 signal from the information about the input air mass and the fuel metering and devices for filtering and/or gradient forming and/or integrating the calculated O2 signal and an O2 signal measured by the exhaust probe. A target/actual comparison between the calculated O2 signal and the measured O2 signal, can be performed for a step load transition.
A method for dynamically diagnosing an exhaust gas probe (17) disposed in an exhaust duct (18) of an internal combustion engine (10), wherein the dynamic diagnosis is performed after a change in a lambda value of the exhaust gas and on the basis of a comparison of a measured signal rise relative to an expected rise of the signal, characterized in that a target/actual comparison between a calculated O2 signal (26) and an O2 signal (27) measured by the exhaust gas probe (17), is performed for a step load transition.
A device for dynamically diagnosing an exhaust gas probe (17) disposed in an exhaust duct (18) of an internal combustion engine (10), the output signal thereof being fed to an engine controller (14) connected to additional input signals providing at least information about intake air mass and fuel metering (13), characterized in that the engine controller (14) comprises devices for determining a calculated O2 signal (27) from the information about the input air mass and the fuel metering (13) and devices for modifying the calculated O2 signal (26) and an O2 signal (27) measured by the exhaust probe (17), wherein for the purpose of a dynamic diagnosis, a target/actual comparison between the calculated O2 signal (26) and the O2 signal (27) measured by the exhaust probe, or between signals derived from said signals, can be performed for a step load transition.
Dependencies are inferred from the claim text.