| 摘要 |
PURPOSE:To detect the abnormality of position information by a simple constitution by providing both the limiter of a deviation between a target position and a present position and a timer, generating an error signal for preventing detonation velocity after the lapse of a fixed time by the timer, and resetting the value of the counter of the timer each time the signal of the present position changes. CONSTITUTION:A position deviation calculating device 1 calculates the position deviation being a difference between the target position and the present position, a position deviation limiter 2 outputs a high level signal when the position deviation is more than a constant numeric value, and outputs a low level signal when the position deviation is less than the constant numeric value. An AND of this signal and a clock from a clock generator 3 is searched by an AND circuit, inputted to a timer 4, and the count-up of the timer 4 is operated. Then, when the overflow of the counter value of the timer 4 is detected, the high level signal is outputted as the abnormality of position information. Therefore, when a fault occurs at a position detector, or when the A and B phase circuits of the position detector broke down, and a signal is not inputted to a controller, the deterioration of the abnormality of the position information can be executed. Thus, the abnormality of the position information of the position detector can be detected. |
