JP2005189210A - Output method of encoder data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove noise by setting upper limit to increasing and decreasing values for each clock of position data and by processing data, based on the upper limit. <P>SOLUTION: The output technique comprises setting of the upper limit (10) to the increasing values (5a) or the decreasing values (5b) of each clock of position data (4), and removing of the noises, such that when the increasing value (5a) or the decreasing values (5b) are within the upper limit (10), the data of last time is added by the increasing value (5a) or the decreasing value (5b); while when the increasing value (5a) or the decreasing values (5b) exceed the upper limit (10), the upper limit (10) is added to the data of the last time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an encoder data output method, and in particular, when noise is added to an analog signal output from a detection unit of an encoder and large discontinuous data is generated in divided data after division processing, an increase value and a decrease value are increased. By restricting the amount of change in the divided data by the upper limit value, this large discontinuous data is suppressed to the upper limit value of the normal movement amount + increase value or decrease value for each clock, and noise is removed to eliminate noise. The present invention relates to a new improvement for improving the performance.

Conventionally, this kind of encoder data output method has been configured as shown in FIG. 2, although the document name is not disclosed.
That is, what is indicated by reference numeral 1 in FIG. 2 is an analog signal obtained from a detection unit of an encoder (not shown). This analog signal 1 is digitized by an A / D converter 2 and is a digital signal processing type dividing circuit. 3 is converted into position data 4.

Since the conventional encoder data output method is configured as described above, the following problems exist.
That is, when noise is added to the analog signal and large discontinuous data is generated in the divided data from the dividing circuit, large discontinuous data 4a, that is, noise is generated in the position data.
This noise has caused a malfunction when using position data.

  An encoder data output method according to the present invention is an encoder data output method in which an analog signal is digitized by an A / D converter and divided by a dividing circuit to generate position data. An upper limit value is set for the value and the decrease value. When the increase value or the decrease value is within the upper limit value, the increase value or the decrease value is added to the previous data, and the increase value or the decrease value exceeding the upper limit value. The time is a method of adding the upper limit value to the previous data and obtaining the position data from which noise which is discontinuous data is removed.

Since the encoder data output method according to the present invention is configured as described above, the following effects can be obtained.
That is, an upper limit value is set for an increase value and a decrease value for each clock of the position data. When the increase value or the decrease value is within the upper limit value, the increase value or the decrease value is added to the previous data, and the upper limit value is set. When the increase value or the decrease value exceeds 1, the upper limit value is added to the previous data to remove noise, so that highly accurate position data can be obtained.

  In the present invention, an upper limit value is set for an increase value and a decrease value for each clock of the position data, and when the increase value or the decrease value is within the upper limit value, the increase value or the decrease value is added to the previous data, The object is to obtain high-accuracy position data from which noise has been removed by adding this upper limit value to the previous data when the increase value or the decrease value exceeds the value.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an encoder data output method according to the present invention will be described with reference to the drawings. Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
1 is a two-phase analog signal obtained from a detection unit of an encoder (not shown). This analog signal 1 is digitized by an A / D converter 2 and is a digital signal processing type. The dividing circuit 3 performs a known dividing process.

In the divided data 3a from the dividing circuit 3, the increase / decrease value calculation unit 5 calculates an increase value 5a and a decrease value 5b of the previous data, and the increase value 5a and the decrease value 5b are set to a predetermined upper limit value 10 Is input to the upper limit value limiter 11 set, and the output data 11a from the upper limit value limiter 11 passes through the adder circuit 12 and the position data 4 is obtained.
The position data 4 is configured to be fed back to the increase / decrease value calculator 5 and the adder circuit 12.

  Next, the operation will be described. First, an upper limit value 10 is set for the increase value 5a and the decrease value 5b for each clock of the position data 4, and the increase / decrease value calculation unit 5 increases the increase value 5a or the decrease value 5b within the upper limit value 10. In this case, the increase value 5a or the decrease value 5b is added to the previous data (previous position data 4).

  Further, when the increase value 5a or the decrease value 5b exceeds the upper limit value 10, the upper limit value limiter 11 limits it, and the upper limit value 10 is added to the previous data, so that the discontinuous data 4a becomes position data. Processing is always performed so as not to get on 4, and calculation is performed so as to obtain position data 4 without noise.

  The present invention can be applied not only to an encoder but also to an output signal of a resolver.

It is a block diagram which shows the output method of the encoder data by this invention. It is a block diagram which shows a conventional method.

Explanation of symbols

1 Analog signal 2 A / D converter 3 Dividing circuit 4 Position data 5a Increase value 5b Decrease value 10 Upper limit value

Claims (1)

In an encoder data output method in which an analog signal (1) is digitized by an A / D converter (2) and divided by a dividing circuit (3) to generate position data (4).
The upper limit value (10) is set to the increase value (5a) and the decrease value (5b) for each clock of the position data (4), and the increase value (5a) or the decrease value (5b) within the upper limit value (10). In this case, the increase value (5a) or the decrease value (5b) is added to the previous data, and when the increase value (5a) or the decrease value (5b) exceeds the upper limit value (10), the upper limit value ( A method of outputting encoder data, characterized in that 10) is added to the previous data to obtain the position data (4) from which noise which is discontinuous data (4a) is removed.

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