Diagnostic system for electric motor
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United States of America Patent
Stats
-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Feb 8, 2000
filing date -
Sep 17, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A diagnostic system for electric motors, such as those used in automotive applications. The system comprises a controller for supplying a desired command current to said electric motor, a sensor for measuring the rotational speed of the motor, a sensor for measuring the actual current supplied to the motor by the controller, a diagnostic control unit adapted to receive the measured rotational speed, measured supplied voltage, and a command current level value as inputs. The diagnostic control unit further comprises circuitry to calculate an estimated actual current drawn by the motor and to signal an error condition if the estimated actual current is not within a calculated valid range.
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