Method for automatically calibrating pulse factor of vehicle traveling data recorder
A technology of driving recorder and pulse coefficient, which is applied in the direction of registration/indication of vehicle operation, instrumentation, registration/indication, etc. It can solve the problems that the pulse coefficient is not too accurate, the accuracy cannot be known, and the pulse coefficient verification, etc., to achieve Solve the effect of poor accuracy, reduce manual setting trouble, and high accuracy
Active Publication Date: 2015-02-18
CHENGDU YIMENG HENGXIN TECH
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Problems solved by technology
[0004] 1. It relies on the pulse coefficient before calibration. If the pulse coefficient itself has a large error before calibration, the newly calculated pulse coefficient will not be too accurate;
[0005] 2. There is no actual verification of the newly calculated pulse coefficient, and its accuracy cannot be known
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[0040] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0041] A method for automatically calibrating pulse coefficients of a vehicle travel recorder, comprising the following steps:
[0042] S1, system initialization, start a 200ms timer;
[0043] S2. Read the k-value calibration flag k_valid;
[0044] S3, judging whether the k-value calibration flag is set, if so, then enter step S4, if not, then explain that it is the first time to perform k-value calibration, enter step S5;
[0045] S4, read the saved k value in the memory and provide it to the vehicle, and enter step S17;
[0046] S5, determine whether the condition that the k value produces reaches, if so, then enter step S6, if not, then exit, and wait for the arrival of the next timing time;
[0047] S6. Start to calculate a k value a...
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The invention discloses a method for automatically calibrating a pulse factor of a vehicle traveling data recorder. The method comprises the following steps: reversely calculating the pulse factor which is called as a k value for short by a vehicle GPS (Global Positioning System) speed; utilizing a formula that the pulse factor is equal to a ratio of a pulse number (pulse) generated per second to the GPS speed and under the action of a timer, generating a plurality of groups of k values and then obtaining an average value; then calibrating the generated k value; storing the k value if the error meets the error range; after delaying for a certain time, repeating the process so as to complete automatic calibration on the pulse factor. The invention provides the method for automatically calculating the pulse factor; the method does not need to be intervened manually, reduces troubles of manual setting, has high accuracy and improves accuracy of calculating the running speed and the running mileage of a vehicle by the vehicle pulse factor.
Description
technical field [0001] The invention relates to an automatic calibration method, in particular to a method for automatic calibration of the pulse coefficient of an automobile travel recorder. Background technique [0002] In the national standard "GB / T 19056-2012" of vehicle travel recorders, there is a regulation of "recorder pulse coefficient", referred to as k value, which is defined as "the number of pulse signals generated during the 1km distance of the vehicle". It is important information for measuring vehicle speed. The car black box uses the measured number of pulses per unit time and the vehicle characteristic coefficient to calculate the vehicle speed. The traditional technology generally calculates a k value in advance according to the specific model and provides it to the terminal device. If the k value is to be changed later, it needs to be manually configured, which increases the labor cost. [0003] The invention with the patent number CN201310013451 disclos...
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IPC IPC(8): G07C5/08H03K5/13
Inventor 王春波廖贵发
Owner CHENGDU YIMENG HENGXIN TECH