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Measurement method for speed variable quantity and ignition method of safe airbag

A technology of speed change and measurement method, applied in the field of vehicles, can solve the problems of airbag misfire, inaccurate calculation, etc., and achieve the effect of avoiding misfire, practical and reliable, and eliminating errors.

Inactive Publication Date: 2019-02-26
深圳市一体数科科技有限公司
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Problems solved by technology

[0006] The present invention aims at that in the existing moving time window algorithm, when the acceleration direction is inconsistent with the traveling direction of the vehicle or the vehicle is not driving on a horizontal road, the calculation of the velocity change s(t,w) will be inaccurate, resulting in misfire of the airbag problem, a method of measuring the speed change and an ignition method of the airbag are proposed

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  • Measurement method for speed variable quantity and ignition method of safe airbag
  • Measurement method for speed variable quantity and ignition method of safe airbag
  • Measurement method for speed variable quantity and ignition method of safe airbag

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Embodiment Construction

[0049] The technical problem to be solved by the present invention is: in the existing moving time window algorithm, when the direction of acceleration is inconsistent with the direction of travel of the car or the car is not on a level road, the calculation of the amount of velocity change will be inaccurate, thus causing the safety airbag to fail. The condition of the ignition. The technical thinking that the present invention proposes with respect to above-mentioned technical problem is: the projection component (x-axis, y-axis and z-axis) that causes on x-axis and / or y-axis and / or z-axis direction due to the gravitational acceleration that accelerometer or vehicle running cause The axes are vertical in pairs, the same below), which is a numerical value with a very low frequency change, so the present invention adopts a software algorithm to filter out this value. Among them, the software algorithm is: Y(K)=а·X(K)+(1-а)·Y(K-1); among them, X(K) is the current data; Y(K-1) i...

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Abstract

The invention provides a measurement method for the speed variable quantity and an ignition method of a safe airbag. The measurement method for the speed variable quantity comprises the following steps that S1, a window width of a time window is obtained; a partition number of the time window is obtained; a filter coefficient is obtained; a brake acceleration of a vehicle is obtained every partition time and filtered to obtain a filter output acceleration; S2, an integral value of the filter output acceleration of the vehicle to time in the time window is calculated every partition time. The measurement method for the speed variable quantity and the ignition method of the safe airbag are simple, practical and reliable.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a method for measuring speed variation and an ignition method for a safety airbag. Background technique [0002] The calibration of the airbag ignition time of the vehicle is completed by measuring the acceleration or speed change, that is, when the measured acceleration or speed change reaches a preset threshold, an ignition command is issued. Specifically, at present, there are mainly the following methods for calibrating the ignition time of the airbag of the vehicle: the acceleration peak method, the velocity variation method, the acceleration gradient method and the moving time window algorithm. Here, when the acceleration peak method is used as the judgment index to calibrate the airbag ignition time, its anti-interference ability is poor; while the speed change method is used as the judgment index to calibrate the airbag ignition time, it is not sensitive enough to the collision. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R21/264G01P7/00G06F17/50
CPCB60R21/264G01P7/00G06F30/20
Inventor 刘丹宁鲍进峰江永斌王进科
Owner 深圳市一体数科科技有限公司
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