Patent ID: 8494751

Claim:
A motor control apparatus for an internal combustion system including an internal combustion engine, the motor control apparatus configured to control a motor placed in the internal combustion system by means of pulse width modulation, comprising: a control signal output unit configured to output a rotational direction signal corresponding to a rotational direction of said motor and a pulse width modulation control signal; a motor-driving unit, into which said rotational direction signal and said pulse width modulation control signal are inputted, the motor driving unit configured to drive said motor based on said inputted pulse width modulation control signal; and a connection unit configured to electrically connect said control signal output unit and said motor-driving unit to transmit said pulse width modulation control signal and said rotational direction signal outputted from said control signal output unit to said motor-driving unit, wherein said motor-driving unit comprises a trouble-detecting unit for detecting an occurrence of a trouble in said connection unit by comparing the duty ratio in said inputted pulse width modulation control signal with said rotational direction in said inputted rotational direction signal, and the motor is configured to vary a compression ratio of the internal combustion engine.