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Error compensation method of absolute code disc in matrix encoding manner

A coding method and error compensation technology, which is applied in the field of photoelectric measurement and automatic control, and can solve the problem of insufficient error-handling capability of absolute code discs.

Active Publication Date: 2015-05-27
严格集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes an error compensation method for an absolute code wheel in a matrix coding mode in order to solve the problem of insufficient ability of the absolute code wheel to handle bit errors

Method used

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  • Error compensation method of absolute code disc in matrix encoding manner
  • Error compensation method of absolute code disc in matrix encoding manner
  • Error compensation method of absolute code disc in matrix encoding manner

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specific Embodiment approach 1

[0035] Specific implementation mode one: combined with figure 1 The implementation process of the error compensation method of the absolute code disc in the matrix coding mode described in this embodiment is as follows:

[0036] Step 1. Use the four-quadrant absolute code disc to read the corresponding absolute code disc value W 1 ;

[0037] The four-quadrant absolute code disc obtains the corresponding absolute code disc value W through the precise code differential circuit 1 ;like Figure 5 As shown, the precise code differential circuit includes fixed value resistors R1, R2, R3, R4, R5, R6, R7, R8, R12, R13, R14, R15, R16, R17, R18, R19, R20 and R21, including The variable resistor (sliding rheostat) and variable resistor (sliding rheostat) 11 made of resistors R9 and R10 also include operational amplifier A1, operational amplifier A2, operational amplifier A3 and operational amplifier A4;

[0038]One input electrical signal is connected to one end of resistor R12 and o...

Embodiment

[0056] Example: Combine Figure 1-7 Shown in detail, the realization process of the error compensation method of the absolute code wheel of the matrix coding method described in detail:

[0057] 1. The matrix-encoded photoelectric code disc reads the corresponding code value. Next, the four-quadrant matrix-encoded photoelectric code disc is used to analyze the encoding and decode the code value w 1 The acquisition process:

[0058] Matrix coding is a variant of Gray code, which can realize 12-bit code value coding with only four circles of code channels, which we call coarse code value, and then cooperate with the subdivided coding of code channels uniformly depicted on the outer circle to realize High-digit, high-resolution code disc encoding in high-precision fields such as aerospace. image 3 It is an eight-bit "matrix" code disc. We will use it as an example to discuss the encoding process. The innermost circle is the usual A1 code track, and the usual A1 and A2 code tra...

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Abstract

The invention provides an error compensation method of an absolute code disc in a matrix encoding manner, and relates to the fields of photoelectric measurement and automatic control. The error compensation method disclosed by the invention solves the problem that the absolute code disc is insufficient in the capability of processing error codes. The error compensation method comprises the following steps: 1, reading a corresponding code value by utilizing a four-quadrant absolute code disc; 2, adopting a reading head of which the outermost circle has a difference of 90 degrees, and reading a value of an incremental code disc through a processing circuit of the incremental code disc; 3, setting a threshold, and calculating the difference of the two code values; 4, replacing the absolute code value exceeding the preset threshold with the corresponding incremental code value. According to the error compensation method disclosed by the invention, a real-time detection method is adopted, the original structure of the matrix encoding disc is utilized, and only a counting circuit structure of the incremental code disc is additionally added, so that the jump variation of the code value due to various factors can be compensated, the advantages of an absolute manner and an incremental manner are merged, the contradiction of the decoding of high code values and the size of the code disc is solved in a certain extent, and the added circuit is simple and reliable, and is convenient to maintain.

Description

technical field [0001] The invention relates to an error compensation method of an absolute code disc, and relates to the fields of photoelectric measurement and automatic control. Background technique [0002] Today, with the increasing degree of electrical automation, the requirements for photoelectric encoders in aerospace and other high-precision fields are getting higher and higher. Absolute code discs are widely used because they can directly read the absolute position of the angle, there is no accumulated error, and the position information will not be lost after power failure. However, the number of code tracks of traditional absolute code discs is generally equal to or slightly more Corresponding to the number of digits of the output binary code, the more coding digits, the larger the structure size, so the absolute code disc using quadrant matrix coding has been widely used in high-precision measurement fields such as aerospace. [0003] Absolute code disc divides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028
Inventor 陈兴林崔宁耿光晓于志亮徐川川刘杨曹开锐李松峰
Owner 严格集团股份有限公司
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