PROCESS CONTROL APPARATUS

专利名称：PROCESS CONTROL APPARATUS发明人：JOHN MICHAEL IRONSIDE申请号：AU3818372申请日：19720121公开号：AU3818372A公开日：19730726

摘要：1370103 Process control LUCAS ELECTRICAL CO Ltd 14 Jan 1972 [15 Oct 1971]48024/71 Heading G4H Process control apparatus includes two transducers 21, 23producing signals representing two parameters related to the process being controlled,a duration significant output control pulse being derived from the signals. As describedeach time a monostable 24 is triggered, gates 71, 72 are enabled for a predeterminedtime to feed frequency significant signals from transducers 22, 23 to counters 73 and 74carrying over to counter 75 and 114. The counts in counters 75, 114 are decoded andused to enable one of the rows 11a-11p and one of the switches 15a-15b in a diodematrix arrangement 77 so that parallel coded signals representing the two parametersare fed to a comparator 53. At the start of the operation a bi-stable 46 is triggered whichresults in the output pulse being commenced and in a counter 52 being pulsed, after adelay determined by a counter 49, by pulses from a source 48 (which may be controlledin accordance with a third parameter). The counter output is fed as the outer input to thecomparator 53, at equality of its inputs a counter 54 being incremented, counters 74, 75and 72 reset and monostable 24 triggered. This process is repeated for a number oftimes determined by counter 54, the output from which, after, for example, 16 signalsfrom the comparator, resets the bi-stable 46 to terminate the output pulse. Each pulse

from comparator 53 also increments counters 86, 87 the counts in which consequentlyvary in a cyclic manner, the instantaneous count being entered into counters 73, 74 eachtime the monostable 24 is triggered. This is stated to compensate for small variations inthe input. The delay introduced by the counter 49 ensures that a minimum output pulselength is always provided. Specifications 1,370,104 and 1,370,105 are referred to.

申请人：LUCAS, JOSEPH %ELECTRICAL< LTD.

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