SU543969A1 - Device for converting rotational speed to digital code - Google Patents

Description

setting the first additional flip-flop position, the single output of which is connected to the second inputs of the first additional element And the second element And, and the second input to the control trigger input, the output of the first additional element And is connected to the counter input, the output of the second element And is connected to The first input is the input of the second additional element, the second input, the second input of which is connected to the switch output via the element NOT, and the output to the input of the additional counter, the zero input of which is connected to the output t The secondary input element And whose first input is connected to the zero input of the second additional trigger, whose single output is connected to the first input of the fourth additional-i supplementary element And whose output is connected to the transfer block input to the counting input of the additional counter, the second inputs of the third and the fourth additional elements And combined and connected to the output of the first element I.

The drawing shows the structural electrical circuit of the device for converting the rotational speed into a digital code.

The first sensor 1 generates pulses whose frequency is proportional to the speed of rotation. These pulses are applied to pulse generator 2, where they are formed; in amplitude and duration, and then through switch 3, which by a signal from the control unit (only the output terminal is shown in the drawing) connects the output of the pulse generator of the desired sensor. To the input of the element AND 4. To the second input of the element I 4, a signal is fed from the one-t output of the control trigger 5-. The signal from the output of the element 4 is fed to the input of the element 6 and also to the input of setting trigger 7 to the position one. A single trigger output 7 is connected to the second input of an AND 6 element, the output of which is fed to a counter 8, in which, at the end of the measurement time, the number is recorded, the number of pulses without one after which the sensor 1 has passed. the first pulse from the output of the element And 4. The end of the measurement and the arrival of the first pulse from the output of the element And 6 are not synchronized / For the purpose of measuring the time from arrival 5 | the last pulse from the output of the element And 4 until the end of the measurement, the time interval-code conversion is used. From the stabilized pulse generator 9 and the pulses are fed to the input of the element I 1O, to the second input of which a signal is fed. cash fc single output trigger 7. If

the trigger 8 is in the state of one, then the pulses from the generator 9 through the element 1 and 10 flow to the program block 11 and to the input of the element 12, to the second input of which goes through the element NO. 13 a signal from the output of the switch 3. the output of the element And 12 pulses arrive at the input of the counter 14 and count; before the appearance at the output of the element And 4 of the next pulse

10 Another impulse from the output of the element AND 4 |, if the trigger 15 is in zero coC, passes through the element AND 16 and counts the counter 14. In the case, after passing the pulse from the output of the element

15 t it takes some time for the next pulse arriving from the output of the software block 11, the measurement end signal, which sets the triggers 5 and 7 to zero, then a number equal to the number of pulses received from the generator 9 will be written to the clock 14 from the appearance of the last pulse from the output of the element 4 to the end of the measurement time.

25 Thus, the rotational speed npi is proportional to the number of pulses in counter 6 during the measurement time (the time specified by the program & 1) minus the time from the arrival of the last impulse from the primary sensor to the appearance of the signal from the program; block.

When using a rotation speed converter with a digital computer in the control circuit of a complex object, a double-shaft gas turbine aircraft engine with an adjustable nozzle, it is necessary to measure the rotational speed of both stages, namely: fan speed and high pressure rotor speed. Di-

40 and the range of speed variations for these stages is different, therefore the measurement time code is supplied to the input of the software HB (setting the measurement time) from the memory of the digital computer (not shown)

45 Receiving the speed deviation in the proposed device is carried out by pre-recording in the counters 8 and 14 in the return code 1 and 2 of the set value of the rotation speed, then it is established

50 trigger 15 in a single position. The difference in the operation of the device in this mode, the snake, lies in the fact that the next impulse from the output of the element 4, passing through epeme1 {t and 17, will change the code of counter 14 to the inverse, blocking the transfer chains of this counter. The deviation of the speed from a predetermined (or measured earlier) is proportional to the "difference in the content of the counter 6 and the product of the given speed by cov

60 held counter 14 to the amount of time

previous measurement and time proportional to the contents of the counter 14.

The introduction of additional AND elements, triggers, and a counter simplifies the process of ps heaving the rotational speed code, which makes it possible to measure the increment of the rotational speed and change the measurement time while ensuring constant and high accuracy of measurement in a wide range of variation of the rotational speeds ..

The use of the device in the contour of the control, for example, an aircraft engine provides a high resolution of 0 in small dimensions.

Invention Formula

A device for converting a speed of rotation into a digital code containing sensors connected via pulse shapers to a switch that is connected to one of the inputs of the first element AND, the other input of which is connected to a control TpHrrepoiji, a pulse generator ce connected to the first input of the second element And, the output of which is connected to the program block, the output of the program block is connected to the control trigger input, the element is NOT and the counter, characterized in that, in order to simplify the device and expand its functional possibilities In the device, additional elements were introduced into the device, triggers and a counter, the first

the input of the first additional element I is connected to the output of the first element I and to the input of setting in the unit position an additional trigger, the unit output of which is connected to the second inputs of the first additional element I and the second element I, and the second input to the input of the control trigger, the output of the first additional element And connected

with the input of the counter, the output of the second element And is connected to the first input of the second additional element And, the second input of which is connected to the switch output through the element NOT, and the output to the input of the additional counter, the zero input of which is connected to the output of the third additional element And, the first input connected to the zero input of the second additional trigger, single output

which is connected to the first input of the fourth additional element And, the output of which is connected to the input of the lock netrenosa and the counting input of the additional counter, the second inputs of the third and four

In addition, additional elements are combined and the keys to the output of the first element I;}.

Sources of information taken into account in the examination:

1, Auth. swith USSR NO 415579, Q O1 and. 7/30 dated 07.28.72.

2, Auth. swith USSR NO ZO8447, Q O8S 9 / OO.ot 25.11.69.