Fast Reading Method of Automobile Instrument Pointer Dial Based on Single-chip Microcomputer Controller

A technology for automobile instruments and instrument pointers, which is applied in the direction of instruments, etc., can solve the problems of difficult integration, difficult development, and difficulty in detecting the deflection angle of the pointer, and achieve the effect of rapid reading.

Active Publication Date: 2018-04-20
WUHAN LAN YAN AUTOMATION APPLY TECHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty in detecting the deflection angle of the pointer, and the deflection value is not easy to convert into an electrical signal, the detection of commercial vehicle instruments is mostly carried out manually, and there are problems such as low efficiency in the production of instruments.
Although studies have shown that video detection methods are used to detect pointer deflection, video detection requires a large number of image processing algorithms, and general single-chip controllers are not competent for image processing.
Therefore, video detection mostly uses a dedicated video processor, which is expensive, difficult to develop, and high in power consumption, and is generally not easy to integrate on the detection platform

Method used

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  • Fast Reading Method of Automobile Instrument Pointer Dial Based on Single-chip Microcomputer Controller
  • Fast Reading Method of Automobile Instrument Pointer Dial Based on Single-chip Microcomputer Controller
  • Fast Reading Method of Automobile Instrument Pointer Dial Based on Single-chip Microcomputer Controller

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with illustrations and specific embodiments.

[0026] Such as figure 1 Shown is a schematic diagram of the principle of the rapid detection method. In the figure, set a reference line with the center point O of the instrument as the center. The reference line and the scale line of the instrument are concentric circles, both of which are centered at point O. A1 and A2 are points on the reference line. The connection between A1 and the center point O The slope of the line is K1, and the slope of the line connecting A2 and the center point O is K2.

[0027] Assuming that the pointer in the initial state of the instrument coincides with the line connecting A1 and the center point O, and after the external signal is input, the pointer deflects, and the current pointer coincides ...

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Abstract

The invention provides an automobile instrument pointer dial quick reading method based on a single-chip microcomputer, comprising the following steps: (1) establishing a standard image of an instrument pointer dial; (2) shooting a to-be-detected instrument pointer dial; (3) setting a reference line with a center point O as the center, setting the radius R of an arc where the reference line is located, calibrating a point A1 on the reference line, calculating the slope of the connection line of the point A1 and the center point O if the instrument pointer in an initial state overlaps with the connection line of the point A1 and the center point O, setting the coordinate of the point A1 as (x, y), extracting the gray value Y1 of the coordinate (x, y) of A1, adjusting the instrument to make the pointer deflect to a certain degree; (4) making an offline lookup table; (5) querying the position to which the pointer deflects; (6) calculating the relative deflection angle Beta of the pointer relative to the initial position; and (7) calculating the automobile speed based on the relative deflection angle Beta. The method has the advantage that the method can be implemented only using a single-chip microcomputer, and does not need a lot of image processing and data calculation.

Description

technical field [0001] The invention relates to the field of automobile instrument detection, in particular to a method for quickly reading the pointer dial of an automobile instrument based on a single-chip microcomputer controller. Background technique [0002] The instrument is an important display window for the car driver. It is used to display information such as the real-time status of the car and body parameters. It is a very important part of the car. Therefore, for automobile meter manufacturers, the factory meter needs to be fully inspected to ensure a 100% pass rate of the product. Most commercial vehicle instruments use stepper motor type combined instrumentation, and the pointer is driven by the stepper motor for deflection indication. Due to the difficulty in detecting the deflection angle of the pointer, and the deflection value is not easy to convert into an electrical signal, the detection of commercial vehicle instruments is mostly carried out manually on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 肖永军熊曾刚李纪平丁么明彭祺屠礼芬
Owner WUHAN LAN YAN AUTOMATION APPLY TECHN
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