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.
Claims17
An apparatus for diagnosing a failure of a phase current sensor, the apparatus comprising:
- a motor;
- an inverter configured to drive the motor;
- phase current sensors respectively configured to detect phase currents of three-phase current supplied to the motor from the inverter;
- and
- a controller configured to:
- convert the phase currents detected by the phase current sensors into d-axis and q-axis currents;
- calculate an average values of the d-axis and q-axis currents in one cycle;
- determine a first condition maintained for a first reference time or longer, the first condition being defined such that a magnitude of the average values is greater than a first reference value;
- in response to determining that the first condition is maintained for the first reference time or longer, determine a second condition maintained for a second reference time or longer, the second condition being defined such that an angle of the average values falls within reference ranges;
- and
- in response to determining that the second condition is maintained for the second reference time or longer, determine the failure of at least one of the phase current sensors.
A method for diagnosing a failure of a phase current sensor, the method comprising:
- detecting phase currents of three-phase current which is supplied from an inverter to a motor by phase current sensors;
- converting the detected phase currents into d-axis and q-axis currents;
- calculating an average values of the d-axis and q-axis currents in one cycle;
- determining a first condition maintained for a first reference time or longer, the first condition being defined such that a magnitude of the average values is greater than a first reference value;
- in response to determining that the first condition is maintained for the first reference time or longer, determining a second condition maintained for a second reference time or longer, the second condition being defined such that an angle of the average values falls within reference ranges;
- and
- in response to determining that the second condition is maintained for the second reference time or longer, determining the failure of at least one of the phase current sensors.
Dependencies are inferred from the claim text.