| 摘要 |
PURPOSE:To control a controlled system safely by adding the output of a detector to a drift value to form a control signal when an operation lever is not located on a neutral position, and when loacated on the neutral point, outputting a reference value to control an actuator. CONSTITUTION:An operation signal from the detector 2 for the operation lever 1 is amplified 3, A/D converted 4 and then inputted to an operation part 7 as a digital signal V. When the lever 1 is located on the neutral position, the detector 5 turns a contact 6 to the (a) side and outputs a neutral point signal. The operation part 7 reads a signal V, and when the neutral point signal is not outputted, reads out a drift value DELTAV from a storage part 9, calculates V+DELTAV and outputs the calculated value to a D/A converter 8. Consequently, the actuator 11 is controlled by the D/A converted value V0 of the calculated value of V+DELTA. When the neutral point signal is outputted, the operation part 7 reads the reference value Vphi at that time from the storage part 9 and outputs the reference value Vphi to the converter 8. Therefore, the actuator 11 is held at a position corresponding to the reference value Vphi. Then, the operation part 7 calculates DELTAV=Vphi-V to update the drift value DELTAV in the storage part 9. |
