Diagnostic system for electric motor
AssigneeDelphi Technologies, Inc.
InventorMark Dennis Kushion
Life of this patent
Estimating the term…
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.
Claims7
A diagnostic system, comprising:
- an electric motor;
- a controller for supplying a desired command current to said electric motor;
- a sensor for measuring the rotational speed of said electric motor;
- a sensor for measuring an actual current supplied to said electric motor by said controller;
- a diagnostic control unit adapted to receive said measured rotational speed, a voltage representative of said actual current, and a command current level value;
- and
- wherein said diagnostic control unit further comprises circuitry to calculate a valid range of current drawn by said electric motor and to signal an error condition if said measured current is not within said calculated valid range.
Dependencies are inferred from the claim text.