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Method for improving accuracy of calculating vehicle running speed by mileage pulse

A technology of vehicle driving speed and pulse speed, applied in speed/acceleration/shock measurement, linear/angular velocity measurement, instruments, etc., can solve problems such as poor anti-interference and large pulse speed error, and achieve improved accuracy and driving pulse speed , to avoid the effect of error

Inactive Publication Date: 2014-04-02
XIAMEN YAXON NETWORKS CO LTD
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Problems solved by technology

[0007] Therefore, in view of the above-mentioned problems, the present invention discloses a method for improving the accuracy of mileage pulse calculation of vehicle running speed, which improves the technical solution of the prior art, and increases the calculation of pulse period on the basis of the mileage pulse mean value method (can be It is referred to as the periodic method to find the pulse speed), through the comparison and trade-off of the pulse speed values ​​calculated by the two algorithms (that is, the average value method for pulse speed and the periodic method for pulse speed), to solve the large error and resistance of calculating the pulse speed only by the mean value method. The problem of poor interference

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  • Method for improving accuracy of calculating vehicle running speed by mileage pulse

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Embodiment Construction

[0024] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as figure 1 The waveform of the mileage pulse signal is shown. When the signal has a falling edge every time, the processor generates an interrupt. The following parameters need to be recorded in the interrupt processing function:

[0026] The mileage pulse number (set as C) increases by 1;

[0027] The time point t of the falling edge of the last pulse (t1, t2 in the figure);

[0028] The period T of the last pulse (eg figure 1 In, T=t2-t1, the unit of T is second);

[0029] In the thread of calculating the pulse speed of the program, periodically calculate and update the real-time pulse speed (set as S), the processing thread is as follows figure 2 shown. In order to finally calculate S, first explain the following parameter symbols involved:

[0030] The time when the real-time pulse speed was calculated last time is t_last;

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Abstract

The invention discloses a method for improving accuracy of calculating a vehicle running speed by a mileage pulse. The method comprises the following steps: S1, a mileage pulse signal has a waveform of a rectangular square wave and when the mileage pulse signal generates a falling edge each time, a processor interrupts and an interrupt handler of the processor records the following parameters: a mileage pulse count C, a time point t when the mileage pulse signal generates the falling edge for the last time and a period T of the last pulse, wherein T=tn-tn-1 and the unit of T is second; S2, a current real-time pulse speed Sa is calculated by adopting an averaging method, and a current real-time pulse speed St is calculated by adopting a periodic method, wherein Sa=Dt / Dc and St=1 / T; S3, by comparing the current real-time pulse speed Sa calculated by adopting the averaging method for obtaining the pulse speed with the current real-time pulse speed St calculated by adopting the periodic method for obtaining the pulse speed, a current real-time pulse speed value S is judged.

Description

technical field [0001] The invention relates to a GPS driving recorder, in particular to a method for improving the accuracy of vehicle running speed in a vehicle-mounted GPS device of the driving recorder. Background technique [0002] In the current vehicle-mounted GPS equipment and driving recorder, there are two common technical means for calculating the real-time driving speed of the vehicle: [0003] 1. Through GPS technology, the longitude and latitude changes of the vehicle are used to calculate the distance on the earth's surface, and then the driving speed is calculated through the distance per unit time; [0004] 2. Use the pre-installed mileage pulse signal when the vehicle leaves the factory to collect and count the pulses generated when the wheels roll, and multiply the number of pulses per unit time by the pulse coefficient to obtain the driving speed. It can be referred to as the average value method to find the pulse velocity. [0005] Among the above two ...

Claims

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Application Information

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IPC IPC(8): G01P3/481
Inventor 郑福弟任赋黄杭星郭亚松
Owner XIAMEN YAXON NETWORKS CO LTD
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