Speed calibration method based on timer

A calibration method and timer technology, applied in the direction of linear/angular velocity measurement, velocity/acceleration/impact measurement, instruments, etc., can solve the problems of inaccurate speed calibration, inaccurate calculation of vehicle characteristic coefficients, etc., to achieve stable calibration and save customers The effect of time and accurate calibration of vehicle speed

Inactive Publication Date: 2016-05-25
AEROSPACE HI TECH HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems of inaccurate calculation of vehicle characteristic coefficients and inaccurate speed calibration, the present invention further provides a timer-based speed calibration method

Method used

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  • Speed calibration method based on timer

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specific Embodiment approach 1

[0033] Specific implementation mode one: as figure 1 As shown, the implementation process of a timer-based speed calibration method described in this embodiment is:

[0034] Step 1. Start the timer, and control the time of pulse number collection through the timer;

[0035] Step 2, collecting the number of pulses;

[0036] Step 3. Judging whether the collection time of the pulse number reaches the set time, if it is, execute step 4, otherwise continue to collect;

[0037] Step 4, perform feature coefficient calculation;

[0038] Step 5. Determine whether the characteristic coefficient calculation has reached the set number of times. If so, perform step 6, otherwise, perform step 1 again to perform the next characteristic coefficient calculation;

[0039] Step 6. After comparing the numerical values ​​of the set times, take the middle value;

[0040] Step 7. At this point, the preliminary calibration is completed;

[0041] Step 8. Carry out long-term correction: after prel...

specific Embodiment approach 2

[0042] Specific implementation mode two: as figure 1 As shown, the timer-based speed calibration method described in this embodiment is characterized in that in step 3, the set time is 0.5-1.5 minutes. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0043] Specific embodiment three: In this embodiment, in step three, the set time is 1 minute. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a speed calibration method based on a timer. In order to solve the problems that the calculation of a vehicle feature coefficient is inaccurate and the speed calibration is inaccurate, the invention provides a speed calibration method based on a timer. According to the technical points, the method comprises: controlling the pulse number acquisition time via the timer; acquiring the pulse number; judging whether the pulse number acquisition time arrives at the set time, if so, calculating a feature coefficient, otherwise, continuing the acquisition till arriving at the set acquisition time; judging whether the calculation of the feature coefficient reaches the set frequency; comparing the set frequency value and then taking a median; accomplishing preliminary calibration; and performing long-term correction. The method shortens the time of customers, and has the advantage of accurate calibration effect.

Description

technical field [0001] The invention relates to a timer-based speed calibration method. Background technique [0002] The vehicle characteristic coefficient, that is, the number of revolutions (r / km) of the driving speed sensor when the vehicle travels per kilometer, it is important information for measuring the vehicle speed, for example: the vehicle travel recorder uses the measured pulse number per unit time and vehicle characteristics coefficient to calculate the vehicle speed. [0003] Assumption: Velocity is V, [0004] The characteristic coefficient of the vehicle is X, that is, X times per kilometer, [0005] M pulses are collected within T hours, and N pulses are generated per revolution [0006] Then: V=M / (N*X*T) (km / h) [0007] The characteristic coefficient of each vehicle is only known by the manufacturer of the vehicle, and it is difficult for the user to obtain, but the user needs to install a car driving recorder, and the recorder requires that the accura...

Claims

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Application Information

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IPC IPC(8): G01P3/00
CPCG01P3/00
Inventor 郑祥滨孙孝武李德贤邓雷
Owner AEROSPACE HI TECH HLDG GROUP
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