Method and apparatus for controlling an electric motor employed to power a fluidic pump
AssigneeGM Global Technology Operations LLC
InventorsDANIEL J. BERRY, PAUL F. TURNBULL, CHIA-CHOU YEH
Life of this patent
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Abstract
An electric motor powers a fluidic pump fluidly connected to a hydraulic circuit. Operating the electric motor includes determining a heat transfer coefficient for the electric motor based upon a temperature of hydraulic fluid in the hydraulic circuit. A temperature of the electric motor is determined based upon the heat transfer coefficient. Operation of the electric motor is controlled based upon the temperature of the electric motor.
Claims18
Method for operating an electric motor employed to power a fluidic pump fluidly connected to a hydraulic circuit, comprising:
- determining a heat transfer coefficient for the electric motor based upon a temperature of hydraulic fluid in the hydraulic circuit;
- determining a temperature of the electric motor based upon the heat transfer coefficient;
- and
- controlling operation of the electric motor based upon the temperature of the electric motor.
Method for operating an electric motor employed to power a fluidic pump fluidly connected to a hydraulic circuit, comprising:
- determining a rotational speed of the electric motor;
- determining a temperature and a pressure of hydraulic fluid output from the fluidic pump;
- determining one of a plurality of heat transfer coefficients for the electric motor based upon the rotational speed of the electric motor and the temperature and pressure of hydraulic fluid output from the fluidic pump;
- determining a temperature of the electric motor based upon the heat transfer coefficients;
- and
- controlling operation of the electric motor based upon the temperature of the electric motor.
Dependencies are inferred from the claim text.