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Malfunction detection method of incremental encoder

An incremental encoder and fault detection technology, which is applied in the direction of instruments, can solve the problems of non-broken fault detection of incremental encoders, achieve accurate detection, and realize the effect of simple circuit

Inactive Publication Date: 2011-08-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a fault detection method for incremental encoders, which solves the problem that the prior art cannot detect non-broken wire faults of incremental encoders

Method used

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  • Malfunction detection method of incremental encoder
  • Malfunction detection method of incremental encoder
  • Malfunction detection method of incremental encoder

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Specific implementation mode one: the following combination image 3 Describe this embodiment, this embodiment is the detection of the electrical pulse signals A and B of the incremental encoder: the electrical pulse signal A with a phase difference of 90° output by the two code channels of the incremental encoder under normal working conditions XOR with B to obtain the synchronous clock signal Clock, at the rising edge moment of every adjacent cycle of the synchronous clock signal Clock, the states of the electrical pulse signals A and B are at A=1, B=0 and A=0, B = Cycle between 1;

[0023] Define the circuit output state Q2Q1 of two JK flip-flops FF2 and FF1 triggered by rising edges as:

[0024] S 0 =00, normal state sequence;

[0025] S 1 =01, normal state sequence;

[0026] S 2 =10, fault state sequence;

[0027] S 3 = 11, regardless of state sequence;

[0028] In every two adjacent cycles of the synchronous clock signal Clock, at the rising edge of the p...

specific Embodiment approach 2

[0032] Specific implementation mode two: the following combination image 3 , Figure 4 and Figure 5 Describe this embodiment. The difference between this embodiment and Embodiment 1 is that the electric pulse signal A is 90° ahead of the phase of B, and the S of Q2Q1 0 The circuit output state of =00 corresponds to the state of electric pulse signal A=0, B=1, the S of Q2Q1 1 The circuit output state of =01 corresponds to the state of electric pulse signal A=1, B=0.

[0033] The design process of the fault detection circuit to realize the detection method of the present invention is as follows,

[0034] First, two rising-edge triggered JK flip-flops FF2 and FF1 are used, and the circuit output state Q2Q1 has four states 00, 01, 10 and 11.

[0035] Define the circuit state:

[0036] S0=00 is the normal state sequence;

[0037] S1=01, it is normal state sequence;

[0038] S2=10, it is the fault state sequence;

[0039] S3=11, it is irrelevant state sequence, the circuit w...

specific Embodiment approach 3

[0045] Specific implementation mode three: the following combination Image 6 Figure 10 Describe this embodiment. The difference between this embodiment and Embodiment 1 is that the electric pulse signal A lags behind the phase of B by 90°, and the S of Q2Q1 0 The circuit output state of =00 corresponds to the state of electric pulse signal A=1, B=0, the S of Q2Q1 1 The circuit output state of =01 corresponds to the state of electric pulse signal A=0, B=1.

[0046] The implementation circuit of this embodiment can be obtained by repeating the design process of the second embodiment in terms of design principles, and the entire fault detection circuit diagram that realizes the detection methods of the second and third embodiments simultaneously Image 6 shown. Through the XOR of the electric pulse signals A and B generated by the encoder, the pulse output diagram of the clock signal Clock required by the fault detection circuit is obtained, and the state machine circuit is ...

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Abstract

The invention relates to a malfunction detection method of an incremental encoder, which belongs to the malfunction detection field of the encoder, and solves the problems of the prior art that the non-wire-break malfunction of the incremental encoder cannot be detected. An electric pulse signal A and an electric pulse signal B of the incremental encoder, phase difference of which is 90 degrees, are exclusive or to obtain a synchronic clock signal Clock, circuit output states Q2 and Q1 of two JK triggers FF2 and FF1 which are triggered by two rising edges are determined according to the stateof the electric pulse signals A and B at the rising edge time of every two adjacent periods of the Clock, and the malfunction of the incremental encoder is judged according to the output state Q2 andQ1. The method also comprises the detection of a Z pulse signal of the incremental encoder: a Z pulse signal is adopted to preset a cascaded counter so as to count the pulse number which is outputtedby the synchronic clock signal Clock when incremental encoder rotates a circle, and the malfunction of the Z pulse signal is judged according to the overflow of the cascaded counter. The method is applicable to the malfunction detection of the incremental encoder.

Description

technical field [0001] The invention relates to a fault detection method of an incremental encoder, which belongs to the field of fault detection of encoders. Background technique [0002] Currently commonly used encoders include incremental encoders and absolute encoders. Incremental encoders have a much wider range of applications than absolute encoders due to their low cost. The photoelectric code disc of the incremental encoder is made of a glass disc coated with a layer of opaque metal film, and then made of circumferentially equidistant light-transmitting and opaque stripes on the metal film. When the code disc rotates, light passes through the transparent stripes, and no light passes through the opaque stripes. The resulting light and dark signals are received by the photosensitive element, and then converted into electrical pulse signals for output. The code disc of the incremental encoder is usually engraved with two code tracks, each code track corresponds to a li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
Inventor 于泳徐冰徐殿国杨荣峰王高林丛培城
Owner HARBIN INST OF TECH