SU1125641A1 - Shaft turn angle encoder - Google Patents

Abstract

.THE TURN ANGLE CONVERTER OF THE SHAFT INTO THE CODE, containing the angle – frequency sensor, whose input is connected to the first input of the element I, the second input of which is connected to the direct output

Description

1 The invention relates to computing, in particular, to digital correction devices, and digital automatic control and monitoring systems can be used. The known converter of the shaft angle gate is a code containing an angle – frequency sensor connected to the first input of the element I, the output of which is connected to the counting input of a pulse counter, a clock pulse generator, the output of which is connected to the first inputs of the first and second triggers and time relay, time relay output is connected to the counting input of the pulse counter and with the second input of the first trigger, the output of which is connected to the second input of the element I, the first output of the pulse counter is connected to the second input of the second trigger, output which is connected to the second input of the time relay p 3 The disadvantage of the converter is low accuracy because the linearization of the output characteristic of the sensor angle ,, - the frequency is carried out with the help of two straight lines. The closest technical solution to the invention is a shaft rotation angle converter into a code containing angle – frequency sensor, the output of which is connected to the first input of the element I, the second input of which is connected to the direct output of the H5 flip-flop, T hen to the first output of the generator of Tactical pulses, the output of the element I is connected to the counting input of the first pulse counter, time relay, frequency filter C2j. However, the known transducer has a low accuracy, due to the fact that the frequency filter has insufficient stability, which leads to large transducer errors. The aim of the invention is to improve the accuracy of the converter. The goal is achieved by the fact that in the angle converter the rotation of the shaft into the code containing the angle frequency sensor, the output of which is connected to the first input of the element I, the second input of which is connected to the direct output of the Zaz-Trigger, whose e-input is connected to the first output torus clock, element output I is connected to the counting input of the first pulse counter, two decoders are entered, the shift register, the AND block, the second pulse counter and the adder, the second output of the clock generator are connected to the R-input of the R5 trigger and by resetting the first and second pulse counters, and the shift register, the output of the first pulse counter is connected to the inputs of the first and second decoders and to the first input of the adder, the output of which is the converter output, the outputs of the first decoder are connected to the corresponding register inputs: shift, the outputs of which connected to the first group of inputs of the block And, the second group of inputs of which is connected to the corresponding outputs of the second decoder, the output of the block of elements And is connected to the input of the second counter impu sov, whose output is connected to the second input of lpg-Tatorey. FIG. 1 shows a functional diagram of a shaft angle converter in code 5 in FIG. 2, graphs explaining the operation of the converter / on, and 4 diagrams of decoders. The converter contains the sensor 1 angle Frequency, the output of which is connected to the first input of the element 2, the second input of the element 2 and is connected to the forward output of the ft5 flip-flop 3, which together with the element 2 and forms the key 4 (electronic). The first generator output of 5 clock pulses is connected to the .5 input. R5 trigger 3, and the second - with the R-input R5 trigger 3, the reset input of the counter of 6m1gulsov, the reset input of the 7shift register, the reset input of the second counter 8 pulses. The counting counter of 6 pulses is connected to the output of the element I 2, and the output of the counter of 6 pulses is connected to the inputs of the decoders 9 and 10 and the first input of the adder} 5 whose output is connected to the output 12 of the converter of the angle of rotation of the shaft into the code, and the second input of the adder 11 is connected to the outputs of all bits of the counter 8 pulses. The outputs of the decoder 9 are connected to the corresponding inputs of the shift register 7, and the outputs of the bits of the 7 shift register are connected to the first group of the inputs of the block 13 elements AND, - the second group of inputs of the block 13 elements I connected to the outputs of the decoder IG, the outputs of the block .13 elements And connected to the summing input of the counter 8 pulses. Decoder 9 (FIG. 3) contains elements AND 14, decoder 10 / (FIG. 4) pulse counters 15 and decoders 16 counter states, Number of elements I, inputs and outputs of register 7, output of the decoder 9 and outputs of the decoder 10 are determined by the number of points kink of the real characteristic of the sensor 1 angle - frequency (Fig. 2) .The shaft angle rotation converter into the code works as follows.The pulse from the first generator output 5 clock pulses converts the R5 trigger 3 into one state. As a result, through the element 2, pulses from the output of the sensor 1 ugo - a frequency with a certain frequency begins to arrive at the counting input of the pulse counter 6. With Bt jporo of the generator output 5 clock pulses, a pulse is sent through time T (Fig. 2), which returns the R5 trigger to the zero state. The same pulse sends a command to the readings. information in the counter 6 pulses and its reset (reset) to the initial state. The received information in the parallel code is fed to the first input of the adder P, from the output of which is fed to the output 12 and for further processing. The number M of pulses, arriving at the counter 6, is N T, where f is the frequency of the pulses at the sensor output 1 angle - frequency during the time interval TO, corresponding to a certain angle of rotation of the shaft, H. Thus, the converter works until the initial characteristic is started (a point with coordinates (f J j (Fig. 2) of sensor 1 is angle - frequency. The decoder 9 is designed in such a way that during the moments before the counting in the counter 6 pulses of numbers N N2 "N" 9 from the corresponding outputs of the decoder 9 are outputted from the signals to the inputs of the shift register 7 On fig.3, the decoder circuit 9 is shown at, 41А With the frequency of the signals at the output of the sensor 1, the angle is the frequency fiJf 7 / and the counter reaches 6 time T, where N., is the number corresponding to the first the inflection point of the real characteristic sensor 1 angle - frequency (Fig. 21, the output of the decoder 9 separates the signal to the first input of the shift register 7) Since the shift register 7 was previously transferred by a reset pulse from the second generator 5 clock pulses to its original state t, e, is prepared for operation the first bit of shift register 7 (unit j is recorded in it, then the signal from the first output of the decoder 9 overwrites the unit to the second bit, prepares it for operation and simultaneously from the first register output 7 the shift is signal one of the first input unit 13.. The decoder 10 is designed in such a way that pulses with certain frequencies F and Fj are removed from its outputs, respectively. To obtain the frequencies F, K, the method of decoding the information state of the counter C is used with a randomly chosen conversion factor M (FIG. 4). Through the block 13 of the elements AND through its second input 8, since the first input is supplied with the signal from the first output of the shift register 7, the pulses are frequency F from the first output of the decoder 10 start to arrive at the counting input of the counter 8 pulses. Moreover, the frequency P "at the first output of the decoder 10 is set so that the number of pulses recorded in the counter 8 pulses would be equal to n when the counter 6 has reached the pulse number B of pulses equal to Nj for a fixed time T, where bj is the number of correction pulses , on which the theoretical characteristic differs from the real characteristic at the moment when pulses 6, S, are reached in the counter (Fig. 2). A reset read pulse, delivered from the second generator output of 5 clock pulses after a fixed time T (Fig. 2), returns the RS trigger to the zero state, the same pulse gives the command to read information from the counters

51

6 and 8 pulses and reset (reset) them to the zero state, and also reset the register

7shift, preparing for its work the first bit. The obtained information from counters 6 and 8 in the parallel code is fed to the input of adder P. As a result, the number of pulses, which was recorded in adder 11, when reading counters 6 and 8 and. when f is equal to, (N.2 -f-n I), THAT corresponds to the theoretical characteristic of the sensor 1 angle-Frequency.

When the frequency of the pulses at the output of the sensor 1 angle - frequency. 7 / i and in the counter 6 pulses of the number M D 4i the number corresponding to the second inflection point of the actual sensor characteristic 1 angle frequency {(Fig.2 /, a signal is output from the second output of the decoder 9 to the second input of the shift register 7. Since the second bit The shift register 7 was previously prepared for operation. By the pulse from the first output of the decoder 9j, the signal from the second output of the decoder 9 rewrites the unit to the third bit of register 7, preparing it for operation, and simultaneously from the second output of the register 7. signal to the next th input unit 13 (one input of the AND block 13) By .ocherednomu second input unit 3 (the other input of the second AND gate unit 13;). pulses

g

with the frequency -Fj, they begin to flow through it from the second output of the decoder 10 to the counting input of the counter 8 pulses.

5 The frequency at the second output of the decoder 10 is set so that the number of pulses recorded in counter 8 is equal to IA) when the counter reaches 6 pulses of the number Id in a fixed time Tj) 5 where, (, -, + and J the number of pulses corrections after two steps of correction, by which the theoretical characteristic differs from the real characteristic at the moment 6 counts reach the counter, f for a fixed time Tg. Thus, Fg is set depending on u, where n is the number of impulses of the second steps

0 Corrections,.

As a result, the number of pulses that will be recorded in the adder 11 when reading counters 6 and 8 pulses and f; j5

5 equals kj «rtj, - 2) what; Corresponds to the theoretical characteristics.

Further, at frequencies .v l ..... ,, ,,. 5 l, the operation of the converter is similar- 0 on the described one.

Thus, the corrected characteristic 1 frequency is practical; This tically coincides with the linear testifying characteristic, which causes an increase in the accuracy of the converter. fz rj .5i 0 П I t I t I I i i and was 522 I I I I I I I I NSbH (6

Fig, 2 i e-Jita :) Real sg / inerisation an ft al xa / t jKfi epuctil) La y / r VH-H f. t r t I I / ...

f bit d frac d zrazrd If the bit d

I p

N, 7

Ff pulse outputs

Fig.Z

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Claims (1)

SHAFT ANGLE CONVERTER TO CODE, the angle sensor is the frequency whose output is connected to the first input of the And element, 'the second input of which is connected to the direct output of the R5 trigger,' whose input is connected to the first output of the clock generator, the output of the And element is connected with a counting input of the first pulse counter, it is necessary that, in order to increase the accuracy of the converter, two decoders, a shift register, a block of I elements, a second pulse counter and an adder, a second output are introduced into it clock generator The pulses are connected to the (R-input of the .RS-trigger and the reset inputs of the first and second pulse counters and the shift register, the output of the first pulse counter is connected to the inputs of the first and second decoder and to the first input of the adder, the output of which is the converter output, the outputs of the first decoder are connected to the corresponding inputs of the shift register, the outputs of which are connected to the first group of inputs of the block of elements And, the second group of inputs of which is connected to the corresponding outputs of the second decoder, the output of the block of elements And nen to the input of the second pulse counter whose output is connected to a second input of the adder. SU,., 1125641> 1 125641