SU479143A1 - Angle-Code Automatic Verification Device - Google Patents

Description

one

The invention relates to avimatics and computing, in particular, to devices for automatically checking analog-to-code converters.

A device is known for automatically checking angle-code converters containing an angle-code checker being scanned, kinematically connected to a digester; The converter input is connected to a pulse generator through a valve and a switch, the output is connected via a logic unit to a coincidence unit and, through a switch and a prohibition element, to control units of the boundary transitions of the first and tested bits, the output of the control unit for the transitions of the tested discharge is connected to the comparison unit The other inputs of which are connected to the outputs of the registering counter and the sensor of the coordinates, and the outputs are connected to the registering counter, the counter of code limits and the pulse generator, the output of the block The first-stage transition transition controller is connected via the first valve to the filling trigger, the output of which is connected to the register counter via another valve, the input of the coincidence unit is connected to the sensor of the reference combinations, and the output is connected to the switch and the resolution trigger, the outputs of which are connected to the inhibit element and the first valve .

The purpose of the invention is to simplify the device.

This is achieved in that in the proposed

device in the circuit between the generator output

pulses and the input of the second valve entered

a frequency divider, the control input of which is connected to the control input of the switch.

The drawing shows a structural diagram of the proposed device.

The device contains a tested angle-code I transducer, pulse distributor 2, switch 3, pulse generator 4, input 5 of control signals of switch 5, motor 6, synchronizer 7, logical

block 8, sensor 9 of reference combinations, block of coincidence 10, source AND reference code, resolution trigger 12, switch 13, switch control input 14, prohibition element 15, block 16 of border control of the first bit, block 17 of border control of the checked boundary bit, the first gate 18, the trigger fill 19, the second gate 20, the recording counter 21, the sensor 22 coordinates of the allowable zone, the control input 23 of the sensor, the comparison unit 24, the counter 25 code limits, controlled frequency divider 26.

The device works as follows. Before the start of checks in the switch 3

the number of the controlled discharge is set, in the switch 13 is one of the subdivision (L or B), in sensor 9, the reference code for the start of the test, in sensor 22, the code corresponding to the limits of the zone of permissible spread of the first transition upon reaching the reference code.

Converter 1 is driven by motor 6. At the initial stage of testing, valve 2, controlled by switch 3, counters all bits of the converter, and shift of pulses of valve 2 produces generator 4 pulses. To eliminate measurement errors, generator frequency 4 and rotation speed of engine 6 should be synchronized via BOM synchronizer 7.

The output converter 1 is converted by logic block 8 into a binary code, which is continuously compared with the sensor code of 9 reference combinations. The comparison is carried out by the coincidence block 10. The code of the reference combination is chosen arbitrarily, but so that it corresponds to the right border (with a positive rotation of the converter) of the allowable scatter zone of any of the code limits.

If the sensor code 9 and the code of the block 8 are equal, the output signal of the match block 10 through the switch 3 transfers the distributor 2 from the polling mode of all bits to the polling mode of two bits (the first and monitored). As a result, signals corresponding to the values of the first or controlled bits appear alternately at the output of the subdivision selected by the switch 13. At the same time, the coincidence unit impulse sets the trigger 12 to the state "1", which opens the valve 18 and also allows the input through the prohibition element 15 of the signals from the converter 1 to the control units 16 and 17 of the transition of code limits. Block 16 registers the transitions of the first discharge, block 17 - transitions of the controlled discharge. Since polling any code section results in a burst of pulses, the length of which is determined by the length of this segment, blocks 16 and 17 are blocks for registering the beginning and end of pulse packets.

The first after the reference combination, the intersection of the code boundary of the first bit corresponds to the end of the allowable zone. In this case, the signal of the block 16 switches the trigger 19 to the state "1, the valve 20 opens, and the counter starts to be filled with 21 pulses of the generator 4.

If the counter code corresponding to the distance from the reference combination to the controlled boundary falls inside the allowable zone, then the coincidence signal produced by the comparison unit 24, if the counter code 21 and sensor code 22 are equal, the counter 21 is reset to counter 25 of code limits is added to "1,

then a new cycle of filling the counter 21 begins.

If the counter code 21 is outside the allowable zone, then the mismatch signal generated by block 24 will stop polling. In this case, in the counter 21, the code of the distance of the sensible code limit from the end of the allowable spread zone of the previous border is recorded, and in the counter 25 - the number of the controlled border.

Frequency divider 26 with a controlled conversion factor is designed to change the filling frequency of the recording counter 21, depending inversely on the binary weight of the controlled discharge. At the same time, the minimum number of counter bits required to encode one code section of any bit of the converter is the same for all bits and equal to the number of bits of counter 21 needed to measure the code section of the first bit. Patch sensor code 22 is also the same for all bits. The width of the comparison unit 24 corresponds to the width of the counter 21.

The frequency of the nerve discharge survey is chosen based on the size of the code section of this bit and on the required measurement accuracy. Halving the polling rate of the next bit causes a double increase in the absolute error of its measurement, however, due to the fact that the dimensions of the code sections are also doubled, the relative error of the measurement remains unchanged.

Thus, the proposed device makes it possible to determine the number of the erroneous code boundary (in terms of the reference combination) and the magnitude of the error, with the relative measurement error being the same for all bits.

Subject invention

A device for automatic checking of angle-code converters containing a pulse generator, the output of which is connected through a serially connected switch and distributor to an angle-code check converter that is kinematically connected to a motor, the output of the checked converter is connected to a block through a logic unit and the element the prohibition - to the blocks of control of border transitions of the first and checked bits, the output of the block of control of transitions of the checked discharge is connected to the block with The other inputs of which are connected to the outputs of the registering counter and the coordinate sensor, and the outputs are connected to the registering counter, the code limit counter and the pulse generator, the output of the first discharge transition control unit is connected via the first gate to the secondary trigger, the output of which is connected to log counter

the coincidence unit is connected to the sensor of the reference combinations, and the output is connected to the switch and the enable trigger, the outputs of which are connected to the prohibition element and the first valve, characterized in that

simplifying the device, a frequency divider is inserted into the circuit between the output of the pulse generator and the input of the second valve, the control input of which is connected to the control input of the switch.