Method for detecting an electrical fault in an electrical network of a motor vehicle
First Claim
1. A method for detecting an electrical fault in an electrical network of a motor vehicle, the method comprising:
- detecting a battery current associated with at least one battery of the network with the aid of a battery current sensor, wherein the network includes the at least one battery, at least one pulse-controlled inverter, and at least one d.c. voltage converter;
detecting an intermediate circuit current associated with the pulse-controlled inverter with the aid of an intermediate circuit current sensor;
detecting a d.c. voltage converter current associated with the d.c. voltage converter with the aid of a d.c. voltage converter current sensor;
calculating an intermediate circuit current with the aid of only the following current sensors;
the battery current sensor and the d.c. voltage converter current sensor; and
comparing a magnitude of the detected intermediate circuit current with the calculated intermediate circuit current; and
checking, based on the comparing, whether a specifiable deviation between the detected intermediate circuit current and the calculated intermediate circuit current has been exceeded.
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Abstract
A method is provided for current-based detection of an electrical fault in an electrical network of a motor vehicle, the network having at least: one battery, one pulse-controlled inverter, one d.c. voltage converter, and an intermediate circuit associated with the pulse-controlled inverter. The method includes: detecting magnitudes of each a battery current, a d.c. voltage converter current, and an intermediate circuit current; comparing current magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded. An alternative method for voltage-based detection of an electrical fault in an electrical network of a motor vehicle includes: detecting magnitudes of each a battery voltage, a d.c. voltage converter voltage, and an intermediate circuit voltage; comparing voltage magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded.
25 Citations
13 Claims
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1. A method for detecting an electrical fault in an electrical network of a motor vehicle, the method comprising:
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detecting a battery current associated with at least one battery of the network with the aid of a battery current sensor, wherein the network includes the at least one battery, at least one pulse-controlled inverter, and at least one d.c. voltage converter; detecting an intermediate circuit current associated with the pulse-controlled inverter with the aid of an intermediate circuit current sensor; detecting a d.c. voltage converter current associated with the d.c. voltage converter with the aid of a d.c. voltage converter current sensor; calculating an intermediate circuit current with the aid of only the following current sensors;
the battery current sensor and the d.c. voltage converter current sensor; andcomparing a magnitude of the detected intermediate circuit current with the calculated intermediate circuit current; and checking, based on the comparing, whether a specifiable deviation between the detected intermediate circuit current and the calculated intermediate circuit current has been exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A method for detecting an electrical fault in an electrical network of a motor vehicle, the method comprising:
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detecting an intermediate circuit voltage associated with at least one pulse-controlled inverter of the network with the aid of an intermediate circuit voltage sensor, wherein the network includes at least one battery, the at least one pulse-controlled inverter, and at least one d.c. voltage converter; detecting, with a d.c. voltage converter voltage sensor, a d.c. voltage converter voltage associated with the d.c. voltage converter; comparing a magnitude of the detected intermediate circuit voltage with the detected d.c. voltage converter voltage; checking, based on the comparing, whether a specifiable deviation between the detected intermediate circuit voltage and the detected d.c. voltage converter voltage has been exceeded; and responsive to the checking indicating that the specifiable deviation has been exceeded, operating a d.c. voltage converter to set, at the intermediate circuit, a power limit for the at least one pulse-controlled inverter. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification