Fault-tolerant design method of an absolute photoelectric encoder measuring channel

A technology of photoelectric encoder and measurement channel, applied in the direction of measuring device, instrument, conversion sensor output, etc., can solve the problems of detection channel single point failure, product failure, function error, etc., to achieve reliability improvement, limited resources, and engineering realization simple effect

Active Publication Date: 2018-12-11
SHANGHAI AEROSPACE CONTROL TECH INST
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Problems solved by technology

For each detection channel of the absolute photoelectric encoder, it is connected in series in the reliability model. The abnormality of each detection channel is a single point of failure, especially the coarse code and medium code channels. Once a problem occurs, it will cause a functional error and cause the entire Product failure, the consequences are extremely serious

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  • Fault-tolerant design method of an absolute photoelectric encoder measuring channel

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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The invention discloses a fault-tolerant design method for the measurement channel of an absolute photoelectric encoder. Aiming at the code disk modulation mode of the absolute photoelectric encoder using a cyclic code, the characteristics of the output angle data when the state of the detection channel of the coarse code and the medium code are abnormal are analyzed, and the According to the relationship between the detection information of each channel of the encoder, a fault-tolerant design method for the measurement channel is proposed: the direction signal is obtained by merging the Dc9 state of the precise code angle measurement data and the signal sequence of the A13 channel; the design of the twelve-bit reversible counter;...

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Abstract

The invention discloses a fault-tolerant design method of an absolute photoelectric encoder measuring channel. The method comprises: subjecting a fine code angle data Dc9 state and with an A13 channelsignal to timing sequence fusion obtain a turning signal; setting a twelve-bit reversible counter according to the turning signal; performing state diagnosis on the A13 channel and the fine code channel; and in case of abnormal state diagnosis, setting the initial value of the twelve-bit reversible counter by coarse code and fine code channel level timing sequence features. When fine code channels J1 and J2 and a medium code channel A13 are normal, and at least one of A1 to A8 channels is normal, the method can automatically correct errors within one round at the initial power up, outputs correct angle data, and greatly improves reliability.

Description

technical field [0001] The invention belongs to the technical field of absolute photoelectric encoders, in particular to a fault-tolerant design method for measurement channels of absolute photoelectric encoders. Background technique [0002] With the rapid development of science and technology, the application of high-precision driving mechanism is becoming more and more extensive, and it is often encountered in fields such as precision manufacturing equipment, robotic arms, optical measurement systems, and high-precision antenna pointing control. In order to achieve high-precision angle control for the driving mechanism, the system needs to be equipped with an angle sensor with sufficient accuracy. The high-precision angle sensor can currently choose products such as inductive synchros, absolute photoelectric encoders, etc. [0003] The code resolution of the absolute photoelectric encoder can be within arc seconds, it can directly read the angle position data, and it has ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/347
Inventor 吴德安张涛于梅李正军张增安刘德庆周胜良高四宏
Owner SHANGHAI AEROSPACE CONTROL TECH INST
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