Vehicle speedometer calibration method and apparatus

A calibration method and a speedometer technology, applied in the physical field, can solve problems such as large volume, large error in test results, and complex structure, and achieve the effects of small volume, reduced error, and simple structure

Inactive Publication Date: 2014-07-09
上海市汽车运输科学技术研究所有限公司
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a calibration method for a vehicle speedometer. The calibration method for such a vehicle speedometer should so

Method used

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  • Vehicle speedometer calibration method and apparatus
  • Vehicle speedometer calibration method and apparatus

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Embodiment 1

[0014] Such as figure 1 and figure 2 As shown, the calibration method of the vehicle speedometer of the present invention includes a step of pointing the light signal window 11 of the photoelectric sensor in the vehicle speedometer 1 to the reflected light signal, and includes a step of measuring the actual moving speed of the reflected light signal , including a step of comparing the moving speed signal of the reflected light signal measured by the vehicle speedometer 1 with the actual moving speed of the reflected light signal, wherein the reflected light is generated by using part of the light emitting diodes in the light emitting diode array 2 signal, using a single-chip microcomputer 3 to light up the light-emitting diodes arranged in a fixed pattern in the light-emitting diode array 2, and then light up the adjacent light-emitting diodes arranged in a fixed pattern along a fixed direction in time order and extinguish The light-emitting diodes that are currently lit, us...

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Abstract

Disclosed is a vehicle speedometer calibration method. A moving reflected light signal is generated in a light-emitting diode array and provided for the vehicle speedometer to measure. A single-chip microcomputer is used for outputting an actual moving speed of the reflected light signal. The measured moving speed of the reflected light signal by the vehicle speedometer is compared with the actual moving speed of the reflected light signal controlled by the single-chip microcomputer, and a speed measurement error of the vehicle speedometer can be obtained. An apparatus achieving the above method comprises a light emitting diode array. Pins of light emitting diodes are connected to an output end of a drive circuit. An input end of the drive circuit is connected to the single-chip microcomputer. A pin on the single-chip microcomputer is also connected to a speed signal output device. According to the invention, the reflected light signal is enhanced, the measurement error is reduced, constant moving speed of the reflection light signal is enabled, the actual moving speed of the reflected light signal is accurately obtained, the size is small and the structure is simple.

Description

Technical field: [0001] The present invention relates to the field of physics, in particular to a calibration technology for a vehicle speedometer, in particular to a technology for calibrating a vehicle speedometer, and in particular to a calibration method and device for a vehicle speedometer. Background technique: [0002] In the prior art, a vehicle speedometer is used to measure the speed of the vehicle. The vehicle speedometer includes a photoelectric sensor. The vehicle speedometer moves with the vehicle. The photoelectric sensor detects the reflected light signal of the speckle image on the road surface. The sensor recognizes, processes and calculates the reflected light signal, so as to obtain the moving speed of the photoelectric sensor relative to the road surface, that is, the speed of the vehicle. In the prior art, a simulated mobile road surface device is used to calibrate the vehicle speedometer. The simulated mobile road surface device is composed of a synchr...

Claims

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Application Information

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IPC IPC(8): G01P21/02
Inventor 许基鲍国华沈行良
Owner 上海市汽车运输科学技术研究所有限公司
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