MOTOR DRIVER OF MOTOR FOR VALVE TIMING CONTROL OF INTERNAL COMBUSTION ENGINE

摘要

A motor driver for driving a motor in a valve timing controller of an internal combustion engine, including an Electronic Driver Unit (EDU) that, upon receiving a target rotation cycle as the instructed rotation cycle, instructs a rotation controller to (i) calculate a duty value of a Pulse Width Modulation (PWM) signal for driving the motor based on an instructed rotation cycle and an actual rotation cycle and (ii) output a calculation result of the duty value to a motor drive unit, with the rotation controller outputting, to the motor drive unit, an instruction signal that rotates the motor forward along an actual rotation direction, when the calculation result takes a positive value as a duty ratio of the PWM signal, establishing an accurate motor rotation speed control together with an improved responsiveness.

主权项

1. A motor driver for a valve timing control of an internal combustion engine, the motor driver comprising:
a motor drive unit driving a motor for a valve opening control of a valve by controlling a phase of a camshaft in an electric variable cam timing system; a motor rotation cycle obtainer obtaining an actual rotation cycle of the motor; a calculator calculating and outputting, to the motor drive unit, a duty ratio of a pulse width modulation (PWM) signal for the drive of the motor, based on a target rotation cycle of the motor, and the actual rotation cycle of the motor obtained by the motor rotation cycle obtainer, when the target rotation cycle is instructed as an instructed rotation cycle; and a controller outputting an instruction signal to the motor drive unit, the instruction signal instructing the motor to rotate backward or forward, depending on a calculation result of the duty ratio of the PWM signal by the calculator, wherein the instruction signal instructs the motor to rotate forward along an actual rotation direction, when the calculation result takes a positive value as the duty ratio, and the instruction signal instructs the motor to rotate backward reversing the actual rotation direction, when the calculation result of the calculator takes a negative value as the duty ratio.