B - Operations – Transporting – 60 – K
Patent
B - Operations, Transporting
60
K
B60K 11/00 (2006.01)
Patent
CA 2714936
To provide an apparatus which estimates the temperatures of a power assisting motor and a controller without using a temperature sensor to achieve overheat protection by a simple control program. A heat generation amount calculation section calculates a heat generation amount Q of a power assisting motor based on supply current. The apparatus includes a current upper limit map having a current upper limit value set therein corresponding to a temperature estimated value T which is an integrated value of the heat generation amount Q and a ratio map 105 having a ratio set therein corresponding to the temperature estimated value T. Energization of the power assisting motor is controlled with a lower one of limited current values determined using the two maps. The heat generation amount calculation section includes a heat generation correction term, and a heat radiation correction term for calculating, as a subtraction term, a function of the difference between the integrated value Td of the heat generation amount and a motor ambient temperature Tm. If the ambient temperature Tm which has a high temperature correlation with a motor control unit becomes equal to or higher than a comparison temperature, then the heat generation amount Q is calculated using a calculation expression equivalent to the heat generation amount calculation expression from which the heat radiation correction term is deleted.
Dennison Associates
Honda Motor Co. Ltd.
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