Automobile instrument pointer dial quick reading method based on single-chip microcomputer

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 fast reading method of an automobile instrument pointer dial based on a microcontroller controller. Background technique [0002] The instrument is an important display window for the car driver. It is used to display the real-time status of the car and body parameters and other information. It is a set of very important components in the entire car. Therefore, for automobile instrument manufacturers, the factory instruments need to be fully inspected to ensure a 100% pass rate of products. Commercial vehicle instruments mostly use stepper motor type combination instruments, and the stepper motor drives the pointer to indicate deflection. Due to the difficulty in detecting the deflection angle of the pointer, and the deflection value is not easily converted into electrical signals, the detection of commercial vehicle meters is mostly manually performed item by item, a...

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

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