| 摘要 |
The present invention comprises a step of driving an engine cooling fan motor; a step of receiving an output voltage of an amplifier by using, as an input, a voltage caused by a load current flowing through the engine cooling fan motor; a step of calculating the voltage caused by the load current by using a voltage generated by an element deviation of the amplifier in the output voltage of the amplifier; and a step of obtaining the load current by converting the voltage caused by the load current. |
