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Position detection error correcting method

A technology for detecting errors and errors, applied in the field of position detection error correction, which can solve the problems of reduced random access memory capacity and inability to perform high-precision corrections, etc., and achieves the effect of short calculation time

Active Publication Date: 2010-04-14
MITSUBISHI ELECTRIC CORP
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  • Description
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Problems solved by technology

In order to ease the trigonometric function operation, for example, in the case where the trigonometric function operation is approximated using a table stored in the random access memory in advance, there is a problem that in order to perform the trigonometric function operation, the random access memory is used accordingly for The capacity of the random access memory for storing the position detection error correction value is reduced, and high-precision correction cannot be performed

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Embodiment approach 1

[0037] figure 1 This is a block diagram showing the configuration of the position detection error correction device 5 for realizing the position detection error correction method in Embodiment 1 of the present invention.

[0038] In the nonvolatile memory 1 as the first storage unit, a correction parameter P for determining the correction function when expressing a position detection error by a correction function approximated by a series of periodic functions is stored in advance, and is read at startup. The correction parameter P is obtained, and then output to the position detection error correction value calculation unit 2 .

[0039] In addition, the calculation essentials of the correction parameter P will be described in detail later.

[0040] The position detection error correction value calculation unit 2 calculates a position detection error correction value C(θ) as a correction function corresponding to the position detection value θ from the correction parameters P...

Embodiment approach 2

[0111] In the previous Embodiment 1, the area division for correcting the short-period error was uniformly divided for the time being, and when the dispersion of the maximum value of the error in each area was large, the area division was performed again, so that the part with a large error was finely divided, In the second embodiment, in the rough division of a part with a small error, a mode in which smooth domain refinement is realized by performing domain division in two steps will be described.

[0112] Below, according to Figure 9 flow chart and Figure 10 Segmentation diagram for , illustrating two-step region refinement. First, if Figure 10 As shown in (a), the entire position detection range is uniformly and roughly divided (for example, divided into five areas in the figure) (Step 51 ). in addition, Figure 10 The waveform in (a) is based on the position detection error extracted at the interval of each roughly divided area, and the long-period correction param...

Embodiment approach 3

[0121] In the previous embodiment, the periodic function G(θ) which is a power function of the detection position θ was represented by a linear function of θ, and a modified example thereof will be described below.

[0122] That is, instead of the sawtooth-shaped function in Equation 2, a quadratic function shown in Equation 16 can be used as a simple periodic function for calculating the error approximation. Here, let the periodic function be f(θ), L represents the basic period of position detection, and θm represents the remainder of dividing the position detection value θ by L. Figure 11 The relationship between the detected position value θ and the function f(θ) is shown.

[0123] Formula 16

[0124] f ( θm ) = - 16 { ( ...

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Abstract

A position detection error correcting method for correcting a position detection error with high accuracy by using a limited storage capacity by calculating a position detecting error correction valueby using simple four arithmetic operations at startup even if a steep error variation is included while reducing the delay of the startup time and the consumption of the capacity of the storage means.A detection error correction value of a position detector (6) is expressed by a correction function C(TheTa) shown in Eq. 1 using a periodical function G(TheTa), and the correction parameters An, Bn, D are previously stored in a non-volatile memory (1). At startup, these correction parameters are read, and the detection error correction value corresponding to the detected position is calculatedan d stored in a random access memory (3). The detection error correction value corresponding to the position detection value from the position detector is read out of the random access memory (3), andthe corrected position detection value obtained by correcting the error of the position detection value is calculated.

Description

technical field [0001] The present invention relates to a position detection error correction method for correcting a detection error of a position detector for detecting a rotational position or a linear position. Background technique [0002] In the conventional position detection error correction device, each periodic component obtained by Fourier series expansion of the error is stored in a non-volatile memory in advance, and the inverse Fourier transform is performed on each periodic component at startup, and the error correction value It is stored in a random access memory, and the error correction value corresponding to the detection position is read out to correct the detection position (for example, refer to Patent Document 1). [0003] Patent Document 1: Patent No. 2543245 (lines 2 to 14 of the right column on page 2, figure 1 ) Contents of the invention [0004] In such a position detection error correcting device, there is a problem that trigonometric functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/244
CPCG01D5/24452G01D5/24409G01D5/2449G01D18/001
Inventor 杉江弘佐久间浩和岡室贵士
Owner MITSUBISHI ELECTRIC CORP
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