PROCESS FOR CONTROLLING A PHYSICAL QUANTITY, AND ARRANGEMENT FOR CARRYING OUT SAID PROCESS

摘要

The invention relates to a process for adjusting a real value (actual value) of a physical quantity to a preset value (ideal value) with the following steps: (a) the difference between the ideal value and the actual value (referred to below as the control deviation) and its sign (referred to below as the control sign) is determined repeatedly at intervals; (b) the control deviation is converted into at least one electrical signal during or after each measurement, and the duration thereof (referred to below as the control deviation duration) is proportional to the absolute value of the control deviation at least in the range of the ideal value, and the value thereof is a function of the control sign; (c) the loading of an analogue electrical memory arrangement is affected by this at least one electrical signal during the control deviation duration; (d) depending on the value of the loading of the memory arrangement the physical quantity is directly or indirectly affected to keep it in the range of the ideal value. Said control process which is partially based on analogue and partially on digital components produces, for a motor which uses a microprocessor for commutating or controlling, a speed controller with a very simple structure.