Device and method for diagnosing the detection of a multi-phase electric current
AssigneeRobert Bosch GmbH
InventorsRoland Schleser, Stephan Hanel
Life of this patent
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Abstract
The present invention relates to the analysis of current sensor signals of a multi-phase electrical system. According to the invention, signal paths between a current sensor element and a measuring device are coupled to a predetermined electric potential for a short time. A change in the subsequent measurement results can then be analyzed to see if they are indicative of a possible malfunction during the measurement.
Claims9
A device for diagnosing a detection of a polyphase electric current, the device comprising:
- a current sensor (11) designed to measure electric phase currents in the phases of the polyphase electric current to be detected and to provide sensor signals corresponding to the measured phase currents at output terminals;
- a measuring unit (13), comprising a plurality of input terminals, wherein an input terminal is respectively electrically coupled to an output terminal of the current sensor (11), and wherein the measuring unit (13) is designed to detect signals provided at the input terminals;
- a test unit (12), which is electrically coupled to a first input terminal of the input terminals of the measuring unit (13) and which is designed to couple the first input terminal of the measuring unit (13) to a predefined voltage potential for a predetermined time period;
- and
- a monitoring unit (14) designed to determine a malfunction during the detection of the polyphase electric current when the signal received by the measuring unit (13) deviates from a predetermined value range while the test unit (12) couples the first input terminal of the measuring unit (13) to the predefined voltage potential.
A method for diagnosing sensor signals of a detected polyphase electric current that are provided at input terminals of a measuring unit (13), the method comprising:
- electrically coupling (Si) a first input terminal of the measuring unit (13) to a predefined voltage potential for a predetermined time period;
- determining (S2) a value for a signal present at the first input terminal of the measuring unit (13);
- determining (S3), via a monitoring unit a malfunction during the detection of the polyphase electric current when, during the coupling of the first input terminal to the predefined voltage potential, the value of the signal at the first input terminal deviates from a predetermined value range.
Dependencies are inferred from the claim text.