| 摘要 |
PURPOSE:To improve safety by operating an abnormality processing means when calculated acceleration varies beyond a set range in addition to when a detected speed becomes larger than a set maximum speed. CONSTITUTION:The absolute value ¦N¦ of the detected speed N of a sensor 2 is calculated and an operation command to a circuit when ¦N¦ is larger than a maximum speed absolute value ¦Nmax¦ or an arithmetic command to a circuit when not is sent. Then it is decided whether the detected speed N is positive or negative to subtract the last detected speed N-1 from the current N when the rotating direction decision result indicates forward rotation or N from N-1 when backward rotation, thereby calculating the extent of variation in N in every set time (t). Then, it is decided whether the calculated acceleration from the circuit A is positive or negative to send the operation command to the circuit when A is larger than its upper limit value Amax or smaller than Amin in a speed increasing state, or to regard N as the next stored speed N-1 when the A is within the set normal range. |
