DIGITAL CONTROL SYSTEM FOR AN ENGINE, IN PARTICULAR FOR A MOTOR OF A PHOTOCOPYING MACHINE, AND A COPYING MACHINE THUS EQUIPPED

摘要

P THE INVENTION CONCERNS THE ELECTRONIC AND ELECTROMECHANICAL INDUSTRY. /P P THE SPEED OF A MOTOR 13 TO BE ADJUSTED IS MEASURED BY A SENSOR 15 WHICH EMITS AN SIGNAL 37 OF INSTANT SPEED. THIS SIGNAL IS COMPARED WITH A SIGNAL OF ORDER 45, INDICATING THE SET SPEED. A CIRCUIT 41 ALLOWS TO SEQUENTIALLY COMPARE A SUCCESSION OF SIGNALS 37 OF INSTANT SPEED, AT THE SETPOINT SIGNAL 45, TO PRODUCE A SUCCESSION OF ERROR SIGNALS 46 STORED IN MEMORY 24. A CIRCUIT 44 COMPARES THE ERROR SIGNALS 46 BETWEEN THEM , TO DRAW AN ACCELERATION ORDER 47. A CIRCUIT 43 THEN CALCULATES A CORRECTION SIGNAL 48, FROM ERROR AND ACCELERATION SIGNALS, TO MODIFY THE ORDER SIGNAL SENT TO ENGINE 13, THROUGH OF A DIGITAL TO ANALOG CONVERTER 26 AND AN ANALOG AMPLIFIER 14. /P P APPLICATION TO THE ADJUSTMENT OF VARIABLE SPEED MOTORS, IN PARTICULAR FOR SCANNING MOTORS OF VARIABLE SCOPING MACHINES, TO IMPROVE THE PRECISION AND ENDURANCE. /P