| 摘要 |
<p>PCT No. PCT/EP83/00078 Sec. 371 Date Oct. 18, 1983 Sec. 102(e) Date Oct. 18, 1983 PCT Filed Mar. 16, 1983 PCT Pub. No. WO83/03315 PCT Pub. Date Sep. 29, 1983.FIG. 2 illustrates a process and an apparatus for controlling a controllable magnitude as well as the use of the process, especially for controlling the throughput of pourable or flowable material (grain or water) in a flour mill. In this connection, a servo drive, constructed as a fluidic pressure drive (5', V'), is provided for controlling a servo element. The deviation, measured by a comparator (1'), is supplied to a discriminator (10), which then gives off a first discrimination signal (+UF, -UF) when the deviation has reached a first (lower) or second (upper) threshold value, the two threshold values lying within a range of small deviations about zero. In this range of small deviations, the pressure drive (5') is acted upon by transient micropressures (rapid pressure fluctuations with small peak values), the reversal points of the microfluctuations depending on the two aforementioned threshold values. For this, a control input of the pressure drive (5') is assigned to the discriminator, which has been provided for giving off the first discrimination signal.</p> |
