Overheat preventing apparatus for electric motor
AssigneeHonda Motor Co., Ltd.
InventorsNoritaka Yamaguchi, Yutaka Tamagawa
Life of this patent
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Abstract
The present invention includes temperature transition estimating means 24, 25 for estimating a temperature transition of an electric motor 1 caused by the passage of electric current through the electric motor 1, an electric pump 8 as coolant supplying means for supplying a coolant to the electric motor, and coolant supply control means 26 to 28 for controlling the pump 8 according to the temperature transition of the electric motor 1 and the coolant temperature. The amount of operation of the electric pump 8 is determined from the temperature transition and the coolant temperature. This structure makes it possible to prevent overheating of the electric motor properly using the coolant while minimizing the energy consumption involved in using the coolant.
Claims11
An overheat preventing apparatus for preventing an electric motor for a vehicle from overheating, comprising:
- temperature transition estimating means for estimating a temperature transition of the electric motor caused by the passage of electric current through the electric motor;
- coolant supplying means for supplying a coolant to the electric motor;
- and
- coolant supply control means for controlling the amount of coolant supply from said coolant supplying means according to at least the estimated temperature transition of the electric motor,
- wherein the electric motor is controlled according to command values for torque to be produced by the electric motor;
- motor control means for performing d-q vector control of the electric motor according to the torque command values;
- and
- torque command correcting means for correcting the torque command values according to at least the rotational speed of the electric motor,
- wherein said temperature transition estimating means estimates the temperature transition of the electric motor using the corrected torque command values and an average value of the corrected torque command values.
Dependencies are inferred from the claim text.