Apparatus and method for diagnosing phase current sensor failure of 3-phase inverter
AssigneeHl Mando Corporation
InventorHye-Ung Shin
Life of this patent
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Abstract
The present disclosure relates to an apparatus and method for diagnosing a failure, which may include a motor, an inverter for driving the motor, a phase current sensor for respectively detecting a phase current supplied to the motor from the inverter, and a controller for converting the phase current detected by the phase current sensor into a current, obtaining an average value of the current in one cycle and comparing the magnitude and angle of the average value with a reference value to determine a failure of the phase current sensor.
Claims20
An apparatus for diagnosing a failure of a phase current sensor, comprising:
- a motor;
- an inverter for driving the motor;
- a phase current sensor for respectively detecting a phase current supplied to the motor from the inverter;
- and
- a controller for converting the phase current detected by the phase current sensor into a current, obtaining an average value of the current in one cycle and comparing the magnitude and angle of the average value with a reference value to determine a failure of the phase current sensor.
A method for diagnosing a failure of a phase current sensor, comprising the steps of:
- a) detecting a phase current which is supplied from an inverter to a motor in a phase current sensor;
- b) pre-processing the detected phase current to obtain the magnitude and angle of the average value of the phase current;
- c) confirming whether the magnitude of the average value of the phase current is maintained to be greater than or equal to a first reference value by exceeding a first reference time;
- and
- d) determining whether a state in which the angle of the average value of the phase current falls within a reference range exceeds a second reference time, if the magnitude of the average value of the phase current is maintained to be greater than or equal to the first reference value by exceeding the first reference time, and if exceeding, determining as a failure of the phase current sensor that has detected the corresponding phase current.
Dependencies are inferred from the claim text.