| 摘要 |
PURPOSE:To prevent a stepping motor from stepping out by locating No.2 set rotational position a little before to the set rotational position, wherein emission of drive pulse to fuel incremental side is prohibited, and emitting drive pulses at certain intervals after a control lever has attained the No.2 set rotational position. CONSTITUTION:No.2 set rotational position is located a little before No.1 set rotational position, wherein emission of drive pulses to the fuel incremental side is prohibited, and after a control lever 12 has attained this No.2 set rotational position, the drive pulses are left emitted at specified intervals, so that calculational lug in a control part 18 is absorbed gradually. When as the latest the lever 12 has attained the No.1 set position, the calculational result from the control part 18 will approx. be identical with the actual rotational position of the lever 12. Approx. at the same time as attainment of the No.1 set rotational position by the lever 12, therefore, a rotational position judging means 7 judges it, and a prohibiting means 8 prohibits emission of drive pulses to the fuel incremental side. Accordingly the lever 12 will never rotate beyond the No.1 set rotational position. |
