SU1345052A1 - Reversible pulse shift transducer - Google Patents

Abstract

The invention relates to measurement technology and can be used in automatic control and regulation systems for measuring linear and angular displacements. The aim of the invention is to improve measurement accuracy by eliminating the appearance of spurious pulses when a source device is detected (

Description

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states of reading elements, for example, when the sensor is turned on. When moving the coding element 1 relative to the reading elements 2,3, shifted one relative to the other by a distance of n ± 1/4 steps of the coding element, at the outputs of the elements And 4,5,6,7 there appear sequences of signals in combinations depending on from the direction of movement of the coding element. These signals arrive at the inputs of the flip-flops 16-19 and the first inputs of the AND elements 8-15, the signals from the outputs of the flip-flops 16-19 arrive at the second inputs of these elements. Depending on the direction of movement of the coding element 1, signals appear at the inputs

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The invention relates to a measurement technique and can be used in automatic control and regulation systems for measuring linear and angular displacements.

The aim of the invention is to improve the measurement accuracy by eliminating the appearance of spurious pulses at the output of the device when establishing the initial state of the reading elements, for example, when the sensor is turned on.

The drawing shows the block diagram of the sensor.

The sensor contains coding element 1, reading elements 2 and 3, one apart from the other at a distance of n ± 1/4 from the coding element of the twelve elements AND 4-15 ,, four triggers 16-19, six elements OR 20-25, reversible The counter 26, in addition, the device contains a trigger 27 and the element OR 28, the first four elements AND 4-7 and are associated with their first and second inputs, respectively, with the first and second reading elements. The output of the first element And 4 is connected to the first inputs of the fifth and ninth elements And 8 and 12 and to the single input of the first trigger 16, the output of the second element And 5 is connected to the single input of the third

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elements OR 20 or 25, coming from the outputs, respectively, the elements And 8-11 or 12-15, While the reversible counter 26 counts the number of pulses proportional to the displacement. At the same time, signals from the outputs of elements AND 8-15 are fed to the inputs of the corresponding elements OR 21-24, and from them to the resetting inputs of the corresponding triggers 16-19, preparing them for further work and ensuring the formation of short pulses at the inputs of the elements OR. The trigger 27 and the OR element 28 serve respectively to indicate the direction of movement and generate a signal to prohibit reading from the counter 26 in the counting process. 1 il.

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trigger 8 and to the first inputs of the seventh and tenth elements And 10 and 13, the output of the third element And 6 is connected with the single input of the second trigger 17 and the first inputs of the sixth and eleventh elements And 9 and 14, the output of the fourth element And 7 is connected to the single input the fourth trigger 19 and the first inputs of the eighth and twelfth elements I 1 and 15, the outputs of the fifth, sixth, seventh and eighth elements AND 8 - 11 are connected to the corresponding inputs of the first element OR 20 and the first inputs of the second, third, fourth and nth element OR 21-24, the outputs of the ninth, tenth, eleventh and twelfth elements AND 12-15 are connected to the corresponding inputs of the sixth element OR 25 and the second inputs of the fourth, second, fifth and third elements respectively 23,21,2,22. The output of the first element OR 20 is connected to the forward input of the reversible counter 26, and the output of the sixth element OR 25 is connected with the reversing input of the counter 26, in addition, the output of the OR element 20 is connected to one of the inputs of the trigger 27 and the element OR 28, and the output of the element 25 OR - with other inputs of the trigger 27 and the element OR 28.

The device works as follows. at once.

The coding element 1, moving relative to the reading elements 2 and 3, arranged to provide a resolution of 1/4 of the encoder pitch at a distance of 1/4 of the encoder pitch, changes their state. These changes are perceived by the decoder, consisting of elements And 4,5,6 and 7, and if we designate element 2 as A, and element 3 as B, then having taken forward a move, at which element 2 is excited, we can imagine a change in the states of the reading elements in the course of an advance in the form of AB, and when reversed, the reverse. The triggers 16-19 in the initial position are in the zero state. Circuit reset dp simplicity not shown.

Suppose that the initial state of the read elements AB, i.e. Both reading elements which are not actuated are present, O, coming respectively from the outputs of elements 4 and 5. There is no coincidence, and the signal does not pass through these circuits. In addition, 1 from the output of the element And 6 enters the first inputs of elements 14 and 9. At the second input of the element 14 there is O, coming from the output of the trigger 10 Pa 16, and at the second input of the element 9 - 1, coming from the trigger 18, on which information about the previous state of the read elements is stored. Coincidence of input signals

15 element 9 sets 1 at its output. This signal is fed to one of the inputs of the element OR 20 and to the direct input of the reversible counter 26. In addition, 1 from the output of element 9

20 arrives at the first input element

OR 22, the output of which, acting on the zero input of the trigger 18, resets it to O, ready. With this, signal 1 appears

The trigger for further operation, 25 A single signal from trigger 18, received at the second input of element 9, disappears, is set to O, and at the output of element 5, register element 9, at the input of which signals go to this state. At the outputs, the rest cease to coincide, stops the output elements AND 4.6 and 7 - O. The DZ signal to give 1 to the element OR 20, and so on - from the output of element 5 comes from the output input of the counter 26.

The pulse duration is quite MAD of the trigger 18 to the second inputs of elements 9 and 15, but since at this moment O are set to the first inputs of these elements, respectively, coming from the outputs of elements 6 and 7, then the signal does not propagate through these circuits.

In addition, 1 from the output of element 5 is fed to the first inputs of elements 13 and 10, but since And at the second inputs of these elements And there are signals O, coming from the outputs of the corresponding triggers 17 and 19, then

This is determined by the response time of the element OR 22, trigger 2 18 and element 9. Thus, when moving forward 1/4 step, 1 is recorded in the sensor counter, which uniquely corresponds to the movement of the encoder.

4Q Moving forward

1 is set at the output of the AND 4 element (state AB) and, hitting the first input of the element AND 8, coincides with 1 stored in the trigger 17 s.

and here the signal is no longer distributed - g of the previous measure. Single beep. Thus, at the time of entry to the input element OR 20,

the device does not transmit any impulses to the counter input that can lead to an error in the account,

When the coding element moves forward, a state of the reading elements corresponding to AB occurs. In this case, 1 appears at the output of element 6, at the outputs of elements 4.5, 7 - O. The signal of element 6 sets the trigger 17 to 1. This trigger signal goes to the second inputs of elements 13 and 8, on the first inputs

O are present, respectively, coming from the outputs of elements 4 and 5. There is no match, and the signal does not pass through these circuits. In addition, 1 from the output of the element And 6 enters the first inputs of the elements 14 and 9. At the second input of the element 14 there is O, coming from the output of the trigger 16, and at the second input of the element 9 - 1, coming from the trigger 18, which stores information about the previous state of the reading elements. Coincidence of input signals

element 9 sets 1 at its output. This signal is fed to one of the inputs of the element OR 20 and to the direct input of the reversible counter 26. In addition, 1 from the output of element 9

arrives at the first input element

OR 22, the output of which, acting on the zero input of the trigger 18, resets it to O, prepared, as determined by the response time of the element OR 22, the trigger 18 and the element AND 9. Thus, when moving forward by 1/4 step in the sensor counter is recorded 1, which uniquely corresponds to the movement of the encoder.

With further progress

1 is set at the output of the AND 4 element (state AB) and, hitting the first input of the element AND 8, coincides with 1 stored in the trigger 17 s.

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direct input of the counter 26 and the first input of the element OR 21, which zeroed the trigger 17, thus completing the formation of the counting pulse.

When reverse (for example, from the initial state of AB), the following is obtained. A single signal at the output of element 4 sets the trigger 16 to 1, which is fed to the second inputs of elements 11,14, since the first inputs of these elements contain O, respectively, coming from the outputs of elements 6 and 7, the signal

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does not further extend. The single signals coming from the output of element 4 to the first inputs of elements AND 8 and 12 are also not propagated further, since the second inputs of these elements receive signals O from the corresponding triggers 17 and 19, Thus, when establishing

the initial state of the reading elements

Copies do not transfer the counting pulse to the meter, thus eliminating the possibility of an error in the count. At. Further reverse 1 appears at the output of the element AND 6, corresponding to the state AB. It is set to 1 trigger 17, by submitting I to the second inputs of elements And 8 and 13, but since O is at the first inputs of these elements, the signal does not propagate further. A single signal from the output of the elements And 6 enters the first input of the element And 9, but at its second input O, and then the signal does not propagate, It enters 1 from the output of element 6 and to the first input of the element 14, at the second input of which 1 arrives from trigger 16, which stores information about the previous state of the reading elements. The signal from the output of element 4, at the inputs of which the signals coincided, goes to one of the inputs of the element EPI 25 and through it to the reversing input of counter 26, In addition, it goes to the second input of the element OR 2 and, having passed it, resets the trigger 16 to Oh, thus ending the formation of the counting pulse, the counter records

I, the further course of the reverse is similar and is also carried out without errors in the pulse count,

A group of elements 11,9,8,10 performs a comparison in the course of forward transmission of the generated pulses through the element OR 20 to the direct input of the counter. The group of elements And 14, 15, 13,12 makes a comparison with the reverse and transmits the generated pulses through the element OR 25 to the reverse input of the counter 26,

Triggers 16-19, together with the OR elements 24,22,21,23, form memory elements storing information about the current state of the reading elements until the formation of the counting pulse, which is the result of a comparison of the previous and the occurring states of the reading elements

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those. the result of choosing the direction of movement. The trigger 27 is designed to provide information about the direction of movement of the coding element, and the OR 28 element is used to generate the Forbid Reading signal during the passage of the forward and reverse counting pulses of the signal, allowing you to avoid reading information from the counter at the time of overwriting.

Claims (1)

Invention Formula A reverse impulse displacement transducer containing a coding element that reads elements that are at a distance of nil / 4 steps from the coding element from one another, where n is an integer, reversible counter, ten AND elements, four OR elements, two triggers, output the first is read; its element is connected to the first inputs of the first, second, third and. the fourth element And, the output of the second reading element is connected to the second inputs of these elements And, the first of which has both inputs direct, the second - both inverse inputs, the third - the first input direct, the second inverse, the fourth - the first input inverse, the second direct , the outputs of the first and third elements And are connected respectively with the single inputs of the first and second triggers and with the first inputs of the fifth and sixth elements And, the outputs of the second and fourth elements And are connected respectively with the first inputs of the seventh and eighth ele And, the outputs of the first and second valves are connected respectively to the second inputs of the eighth and fifth elements, And the outputs of the fifth, sixth, seventh and eighth elements And are connected to the corresponding inputs of the first element OR, in order to improve the measurement accuracy , the device is equipped with the third and fourth triggers, eleventh and twelfth elements AND, fifth and sixth elements OR, the outputs of the first, second, third and fourth elements AND are connected respectively to the first inputs of the ninth, ten Eleventh and dvenadtsato- elements I o And the second and fourth outputs of AND gates respectively connected to oot- with single inputs tre7 1345052S the third and fourth triggers, the output of the eleventh and the twelve first and second triggers of the AND connection elements are connected to the corresponding, respectively, with the second inputs of the sixth element the eleventh and tenth elements or, respectively, with the second entrances, the outputs of the third and fourth dami fourth, second, fifth and the flip-flops are connected respectively to the third OR elements, the outputs of the streamers by the second inputs of the sixth, twelfth and third, respectively, are connected to the first and the seventh, ninth element-left inputs of the fourth, second, Commands AND, outputs of the first, sixth, seventh, first, and third triggers, and the outgoing and eighth elements, AND connections of the first and sixth elements, OR here, respectively, with the first inputs connected respectively with the direct and the second, third, fourth, and n-reversible inputs of the reversible counting element OR, the outputs of the ninth chick.