SU341062A1 - - Google Patents

Description

The invention relates to computing and can be applied in devices converting angular values into a digital code.

There is a known method for improving the accuracy of conversion for shaft-to-code converters by introducing a step-up reducer between the monitored shaft and converter shaft,

To avoid counting ambiguity in the output code with an unlimited angle of rotation. The controlled shaft, as well as to increase the number of conversion bits directly onto the shaft, installs another converter shaft - code (coarse channel).

The presence of two transducers, as well as the ambiguity of the output data, are eliminated either by special synchronization schemes between the codes of both channels (for sequential counting transducers) or in the coarse channel, protected codes (Barker code, Gre code, etc.) are used with further conversion to binary code on additional devices (for transducers-read).

In order to eliminate the coarse canal converter of older goats, bits of a reversible counter are counted from the outputs, counting pulses generated at the moment of changing two specific values of the converter code of the exact channel and corresponding to the zero angular value of the shaft of the converter, and adding OR subtraction to a reversible signal

the counter depends on the order in which these code values change.

The drawing shows a diagram of the device, realizing. The proposed method. The scheme contains: controllable shaft /;

io-overdrive gearbox 2; input shaft 3 of the converter; 4 shaft-code converter; analysis circuit 5; bus 6 counting pulses; a bus 7 of an indication of the direction of rotation of the converter shaft; reversible counter 8

nmiuls.

The controlled shaft / is connected to the shaft 3 of the transducer 4 via a higher reducer with a gear ratio i. The output code 9 of the converter 4 is fed to the output of the device as the code of the exact channel of the converter and simultaneously to the converter code analysis circuit 5. The analysis scheme is designed to extract from the code .9 information about the full rotation of the shaft 3 convertible pulses at the moment of changing the code value with the greatest weight to the code value with the lowest weight and vice versa.

The analysis scheme extracts from code 9 information on the insertion of a vrash, eni converter shaft, which is obtained from the sequence of codes being analyzed. For a binary code, when changing in all bits from units to zero, which corresponds to an increase in the code, i.e., to the direct direction of rotation of the converter shaft, the sign “- ва is assigned and when changing in all bits of a code with zero“, all units, which corresponds to a decrease in the code and, consequently, to the reverse vrash, to the hue of the shaft of the transducer is the sign “-. The counting pulses along the bus 6, together with the sign of “driving a vrash, enn coming through the bus 7, are fed to the reversible counter 8.

The number of counting pulses, calculated from a specific angular value of the shaft

The device in binary code on the reversible counter 8, taking into account the sign of rotation, corresponds to the number of full revolutions of the shaft 3 of the converter 4. The resulting binary code is received and is the code 10 most significant bits of the device. (In the drawing, the output code is //}.

Subject invention

The method of analog-digital conversion of the angle of the HOBOpiOTa shaft into a code using an exact and coarse sampling system, characterized in that, in order to increase the accuracy of the conversion, two codes are selected and

at the moment of transition from one to the other, a pulse is produced, the polarity of which is determined by the direction of rotation of the shaft, the algebraic sum of these pulses is calculated, and the magnitude of this sum is determined

angle value.