| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic throttle device at low cost using a low-priced microcomputer by generating a current command on the basis of an opening command and an opening feed back signal, and varying a PWM control signal by the current command and a motor current feed back signal so as to control motor current. SOLUTION: In an opening control system 13 of a microcomputer, an opening control calculation is carried out on the basis of an inputted throttle opening command and a throttle opening signal from an opening sensor 3, and a current command is outputted to an analog current control system 5. In the current control system 5, a deviation between the inputted current command and a motor current value detected by a motor current detecting unit 51 is found out, current is controlled, and a PWM signal is outputted to a H-bridge chopper 7. By the H-bridge chopper 1, chopper operation is carried out by the PWM signal and a valve opening/closing direction driving signal from an opening/ closing direction driving unit 15, a motor 8 installed in a throttle body 10 is driven, and an opening of a throttle valve 103 is controlled. |
