Control apparatus for electric motor and control apparatus for hybrid vehicle
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYutaka Tamagawa, Takuya Shirasaka
Life of this patent
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Abstract
A corrected torque command value P_TRQ which is produced by correcting a torque command value TRQ with a torque command correcting unit 34 is substantially proportional to the armature current of an electric motor. Using the corrected torque command value P_TRQ and its average value P_ATRQ, an inferred temperature change Δtf of the electric motor is determined in each predetermined cycle time. The inferred temperature change Δtf calculated in a fuzzy inference operation, for example. The inferred temperature change Δtf is integrated by an integrating unit 37 to determine an accumulated temperature change ΔTf. The output of the electric motor is limited when the accumulated temperature change ΔTf exceeds a predetermined value.
Claims17
An apparatus for controlling an electric motor depending on a torque command value, comprising:
- inference means for sequentially calculating an inferred value of a temperature change of the electric motor in each cycle time using at least data representing the torque command value and data representing an average of torque command values;
- integrating means for sequentially integrating the inferred value of the temperature change of the electric motor to calculate an accumulated temperature change;
- and
- output limiting means for limiting the output of the electric motor when said accumulated temperature change exceeds a predetermined output limiting threshold.
An apparatus for controlling a hybrid vehicle having an engine for generating a propulsive force for the hybrid vehicle, an electric motor coupled to an output shaft of said engine for selectively generating an assistive propulsive force for the hybrid vehicle in a power mode and generating electric energy using the kinetic energy of the hybrid vehicle as an energy source in a regenerative mode, depending on the operating state of the hybrid vehicle, and an electric energy storage device as a power supply for the electric motor in said power mode, wherein a torque command value for the electric motor is generated depending on the operating state of the hybrid vehicle, and the electric motor is controlled depending on the torque command value, said apparatus comprising:
- inference means for sequentially calculating an inferred value of a temperature change of the electric motor in each cycle time using at least data representing the torque command value and data representing an average of torque command values;
- integrating means for sequentially integrating the inferred value of the temperature change of the electric motor from a predetermine time to calculate an accumulated temperature change from the predetermine time;
- and
- output limiting means for limiting the output of the electric motor when said accumulated temperature change exceeds a predetermined output limiting threshold.
An apparatus according to 16, wherein said engine loss reduction inhibiting means comprises means for permitting the process of reducing a pumping loss of said engine to be performed by said engine loss reduction control means when said accumulated temperature change exceeds said engine loss reduction inhibiting threshold and thereafter becomes lower than a predetermined engine loss reduction permitting threshold which is lower than said engine loss reduction inhibiting threshold.
Dependencies are inferred from the claim text.