Unlock instant, AI-driven research and patent intelligence for your innovation.

A Time Stamp Based Encoder Position Signal Estimation Method

A signal estimation and encoder technology, which is applied in the direction of using optical devices to transmit sensing components, can solve problems such as the inability to reduce the influence of quantization errors, and achieve the effects of small occupied space, high calculation efficiency, and improved test accuracy.

Active Publication Date: 2022-02-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application No. 201711324569.3 proposes a method to improve the position accuracy of the encoder. The measured value of the encoder is calibrated by the reference position of the high-precision turntable. This method can overcome the accuracy drop caused by the manufacturing and installation error of the encoder to a certain extent. , but still cannot reduce the influence of quantization error

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Time Stamp Based Encoder Position Signal Estimation Method
  • A Time Stamp Based Encoder Position Signal Estimation Method
  • A Time Stamp Based Encoder Position Signal Estimation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Taking the encoder position signal estimation of the X servo axis of a CNC machine tool during the circular motion as an example, the relevant parameters are as follows: 1) The physical resolution of the linear encoder is 0.02mm; 2) The high-frequency sampling frequency is 1MHz, which is used for inspection Encoder event; 3) The low-frequency sampling frequency is set to 1kHz, and the sampling time is 90 seconds; 4) The diameter of the circular motion is 100mm, and the feed rate is 100mm / min. 5) Use a post-processing circuit capable of subdividing adjacent grating lines by 4096 times to collect encoder signals as reference position signals (ie, actual position signals).

[0031] The method of the invention is applied to estimate the position signal of the X-axis encoder.

[0032] Such as figure 1 As shown, the encoder position signal estimati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for estimating encoder position signals based on time stamps, which enables the encoder acquisition module of the control system to work at high and low frequencies: check encoder position changes at high frequencies, and monitor encoder events when the encoder position changes Record and save the latest encoder event sequence in the register; collect the encoder position signal at low frequency, perform polynomial fitting solution to the encoder event sequence in the register, and then make corrections to the position signal. The method of the invention can effectively correct the position signal of the encoder in real time, reduce the influence of the quantization error, and improve the test accuracy of the low-resolution encoder.

Description

technical field [0001] The invention relates to a time stamp-based encoder position signal estimation method, which belongs to the field of position measurement. Background technique [0002] As a position sensor, the encoder is widely equipped in automation equipment (machine tools, industrial robots, radar, etc.), and is used for position feedback of the control system. The physical resolution of the encoder is determined by the interval of the grating lines, the larger the interval, the lower the resolution. The encoder position signal has a quantization error caused by the grating line interval, and the quantization error can reach half of the grating line interval. In order to improve the accuracy of the encoder position signal, it is often necessary to take measures to reduce the grating line interval or increase the post-processing subdivision circuit, but this will greatly increase the hardware cost of the test. How to reduce the quantization error and improve the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/38
CPCG01D5/38
Inventor 徐晓强胡宏伟王向红贺湘宇易可夫
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY