JP6405506B2 - Incremental signal abnormality detection method and apparatus for absolute encoder - Google Patents

Description

  The present invention relates to an absolute signal abnormality detection method and apparatus for an absolute encoder, and more particularly to a novel improvement for generating an alarm when an abnormality occurs in an incremental signal.

Conventionally used encoders of this type include the configurations disclosed in Patent Document 1 as shown in FIGS.
That is, FIG. 3 is a functional block diagram of the embodiment of the present invention. In FIG. 3, 11 is an original signal output unit, 12 is an A / B phase direction discrimination circuit, 13 is an up / down counter, 14 is an initial value detection circuit, 15 is a data latch circuit, 16 is a Z signal conversion circuit, and 17 is parallel serial. A conversion circuit, 18 is a power ON / OFF detection circuit, and 19 is an abnormality detection circuit.

  Like the conventional incremental encoder, the original signal output unit 11 includes a light emitting element, a circuit slit plate, a light receiving element, and a waveform shaping circuit (not shown). As representative examples of the output signal, an incremental signal A phase, B as shown in FIG. Phase, Z phase and three phase excitation switching commutation signals CS1, CS2 and CS3 are output.

  FIG. 4 is an example of operation waveforms of the A and B phase direction discriminating circuit 12. When the A phase is ahead of the B phase, a down pulse is output, and when the A phase is behind the B phase, an up pulse is output. Is done. The up pulse and the down pulse are input to the up / down counter 13, and the pulses are counted to change the count data.

  FIG. 5 shows an example of the operation waveform of the initial value detection circuit 14, and FIG. 6 shows an example of the circuit. Two-bit initial values D1 and D0 are output by the A-phase and B-phase signals “H” and “L”.

  FIG. 7 shows an operation waveform example of the up / down counter 13, and here, an operation example of the 16-bit counter is shown. This up / down counter is a pulse counter that can be switched between a data preload operation and a count operation in accordance with the output of the main power ON / OFF detection circuit 18.

Japanese Patent No. 3047809

Since the conventional encoder is configured as described above, the following problems exist.
In other words, in the conventional configuration, when each information is serially transmitted, the number of 14 signal lines conventionally required can be reduced to four. As in the present invention, the incremental signal of the absolute encoder can be reduced. A configuration for detecting an abnormality is not disclosed.
In addition, although the patent document and the figure are not shown, in an absolute encoder that uses an absolute signal and an incremental signal, uses the absolute signal value as an initial value, and generates an encoder signal by up-down the incremental signal, the incremental signal is disconnected, etc. If an error occurs in the encoder signal, the encoder signal will be misaligned. If the abnormality of the incremental signal is not detected, an alarm cannot be output when the encoder signal is misaligned. .

  The present invention has been made to solve the above-described problems, and in particular, an absolute encoder that improves the reliability of an absolute encoder by generating an alarm when an abnormality occurs in an incremental signal. An object of the present invention is to provide an incremental signal abnormality detection method and apparatus.

  An absolute signal abnormality detection method for an absolute encoder according to the present invention uses an absolute signal and an incremental signal, uses a counter that is up / down in synchronization with the increase / decrease of the absolute signal and resets at the change point of the incremental signal, An alarm is generated when the absolute value of the counter value exceeds a predetermined judgment value, and an increase / decrease in the absolute signal is detected and an up / down signal is input to the counter. A first detection unit, a second detection unit for detecting a change point of the incremental signal and inputting a reset signal to the counter, an absolute value from the counter being inputted, and the determination value being inputted Compare to generate the alarm In addition, an absolute signal abnormality detection device for an absolute encoder according to the present invention uses an absolute signal and an incremental signal to up / down in synchronization with the increase / decrease of the absolute signal and the incremental signal. A counter that resets at the change point of the counter is configured so that an alarm is generated when the absolute value of the counter value exceeds a predetermined judgment value, and an increase / decrease in the absolute signal is detected. And a first detection unit for inputting an up / down signal to the counter, a second detection unit for detecting a change point of the incremental signal and inputting a reset signal to the counter, and The absolute value is input and the judgment value is , A comparator for generating said alarm being force is Configurations which comprises a.

Since the absolute signal abnormality detection method and apparatus for an absolute encoder according to the present invention are configured as described above, the following effects can be obtained.
In other words, the absolute value of the counter value is determined in advance using a counter that uses the absolute signal and the incremental signal, and uses a counter that is up / down in synchronization with the increase / decrease of the absolute signal and resets at the change point of the incremental signal. When the specified judgment value is exceeded, an alarm is generated and the incremental signal becomes abnormal, and when the encoder signal is misaligned, the incremental signal is detected and an alarm is generated. Can be improved.
A first detector for detecting an increase / decrease in the absolute signal and inputting an up / down signal to the counter; and a change point of the incremental signal and inputting a reset signal to the counter. Incremental signal abnormalities with a simple circuit configuration by using the second detection unit and the comparison unit for inputting the determination value and the alarm when the absolute value from the counter is input Detection can be performed, and the reliability of the absolute encoder can be improved.

FIG. 2 is a block diagram illustrating an absolute signal abnormality detection method and apparatus for an absolute encoder according to the present invention. It is a wave form diagram which shows the operation | movement of FIG. It is a block diagram which shows the conventional encoder. It is a wave form diagram at the time of operation | movement of FIG. FIG. 4 is an operation waveform diagram of the initial value detection circuit of FIG. 3. FIG. 4 is a circuit diagram of the initial value detection circuit of FIG. 3. FIG. 4 is an operation diagram of the up / down counter of FIG. 3.

  An absolute signal abnormality detection method and apparatus for an absolute encoder according to the present invention is to improve the reliability of an absolute encoder by generating an alarm when an abnormality occurs in an incremental signal.

Hereinafter, preferred embodiments of an absolute signal abnormality detection method and apparatus for an absolute encoder according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
FIG. 1 is a block diagram showing an absolute signal abnormality detection method and apparatus for an absolute encoder according to the present invention. An absolute signal 2 of an absolute encoder 1 is a first detector 3 for detecting an increase / decrease in the absolute signal 2. Has been entered.

  The up signal 3A and the down signal 3B from the first detection unit 3 are input to the counter 13, and the incremental signal 4 of the absolute encoder 1 is a second for detecting the change point 4A of the incremental signal 4. The reset signal 5A from the second detection unit 5 is input to the detection unit 5 and input to the counter 13.

  The absolute value 13AA of the counter value 13A of the counter 13 is input to the comparison unit 6, and further, the determination value 7A preset by the determination value setting unit 7 is input to the comparison unit 6, After the absolute value 13AA and the determination value 7A are compared by the comparison unit 6, an alarm 8 is output.

Next, the operation of the absolute signal abnormality detection method and apparatus of the absolute encoder according to the present invention in the above-described configuration will be described with reference to FIG.
First, the absolute signal 2 from the MSB to the LSB shown in FIG. 2 of the absolute encoder 1 has an up signal 3A and a down signal 3B that are up / down in synchronism with the increase / decrease in the first detection unit 3. Input to the counter 13.

In the second detector 5, a reset signal 5A generated at the A phase change point 4A of the incremental signal 4 and reset by the A phase change point pulse 9 of FIG.
The absolute value 13AA of the A-phase abnormality counter value 13A output from the counter 13 is compared by the comparator 6 to which the determination value 7A is input. For example, when the determination value 7A is set to 5 (FIG. 2). 2), because an abnormality 13AA has occurred in the A phase in FIG. 2, an alarm 8 is generated at the moment when the judgment value 7A changes to 5 or 6, and the subsequent devices Runaway, etc. can be prevented.

The gist of the above-described absolute encoder abnormality detection method and apparatus of the absolute encoder according to the present invention is as follows.
That is, using the absolute signal 2 and the incremental signal 4, a counter 13 that is up / down synchronized with the increase / decrease of the absolute signal 2 and resets at the change point 4 </ b> A of the incremental signal 4 is used. An absolute signal abnormality detection method and apparatus for an absolute encoder, wherein an alarm 8 is generated when an absolute value 13AA of a value 13A exceeds a predetermined judgment value 7A, and an increase / decrease in the absolute signal 2 And detecting the change point 4A of the incremental signal 4 and inputting the reset signal 5A to the counter 13 as well as the first detection unit 3 for inputting the up / down signals 3A and 3B to the counter 13. Second detector 5 and the count 2. An incremental signal of an absolute encoder according to claim 1, wherein the absolute value 13AA from the data input unit 13 and the comparison value 6 for generating the alarm 8 when the determination value 7A is input are used. An abnormality detection method and apparatus.

DESCRIPTION OF SYMBOLS 1 Absolute encoder 2 Absolute signal 3 1st detection part 3A Up signal 3B Down signal 4 Incremental signal 4A Change point 4AA Abnormal 5 2nd detection part 5A Reset signal 6 Comparison part 7 Judgment value setting part 7A Judgment value 8 Alarm 9 A Phase change Point pulse 13A Counter value 13AA for A phase abnormality 13AA Absolute value

Claims (4)

  Using the absolute signal (2) and the incremental signal (4), a counter (up / down in synchronization with the increase / decrease of the absolute signal (2) and reset at the change point (4A) of the incremental signal (4) ( 13), the absolute value (13AA) of the counter value (13A) of the counter (13) exceeds the predetermined judgment value (7A) and an alarm (8) is generated. Incremental signal error detection method.   A first detector (3) for detecting an increase / decrease in the absolute signal (2) and inputting an up / down signal (3A, 3B) to the counter (13), and an incremental signal (4) A second detection unit (5) for detecting a change point (4A) and inputting a reset signal (5A) to the counter (13) and an absolute value (13AA) from the counter (13) are input. The absolute signal abnormality detection method for an absolute encoder according to claim 1, further comprising: a comparison unit (6) for receiving the determination value (7A) and generating the alarm (8).   Using the absolute signal (2) and the incremental signal (4), a counter (up / down in synchronization with the increase / decrease of the absolute signal (2) and reset at the change point (4A) of the incremental signal (4) ( 13), and an absolute encoder of the absolute encoder characterized in that an alarm (8) is generated when the absolute value (13AA) of the counter value (13A) of the counter (13) exceeds a predetermined determination value (7A) Incremental signal abnormality detection device.   A first detector (3) for detecting an increase / decrease in the absolute signal (2) and inputting an up / down signal (3A, 3B) to the counter (13), and an incremental signal (4) A second detection unit (5) for detecting a change point (4A) and inputting a reset signal (5A) to the counter (13) and an absolute value (13AA) from the counter (13) are input. The incremental signal abnormality detection device for an absolute encoder according to claim 1, further comprising a comparison unit (6) for generating the alarm (8) when the determination value (7A) is inputted. .

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