ABNORMALITY DETECTOR FOR POSITION INFORMATION

Japanese Patent JPH04155508

A

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.

UESHIBA NOZOMI

JP28211090A

May 28, 1992

October 19, 1990

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MATSUSHITA ELECTRIC IND CO LTD

G05B23/02; G05D3/00; H02P29/00; H02P29/024; (IPC1-7): G05B23/02; G05D3/00; H02P5/00

Akira Kobiji (2 outside)

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