Patent ID: 8089235
Filing Date: 2012-01-03
Classification: H02P

Abstract:
1. A motor driving apparatus for an electric valve timing adjusting apparatus that adjusts timing of opening and closing a valve of an internal combustion engine by using a motor, the motor driving apparatus comprising: a motor that drives the electric valve timing adjusting apparatus; a switching part for applying a drive voltage to the motor; a current information output part that provides current information according to a current flowing in the switching part ; a power distribution control part that controls power distribution to the motor by controlling the switching part; and an oil temperature information output part that is configured on a circuit board, and that provides oil temperature information according to an oil temperature corresponding value, which is temperature of the circuit board and corresponds to temperature of oil surrounding the electric valve timing adjusting apparatus, wherein: the power distribution control part controls the current flowing in the switching part by temporarily cutting off the power distribution to the motor based on the current information provided from the current information output part, so that the current flowing in the switching part does not exceed a target current value; and based on the oil temperature information provided from the oil temperature output part, the power distribution control part adopts an excess current, which is a large current value larger than a normal current value, as the target current value during a period from when the internal combustion engine is started to when the oil temperature corresponding value reaches a predetermined temperature.