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Method and device for determining the speed of a vehicle

A technology of automobile speed and automobile, which is applied in the direction of measuring device, speed/acceleration/shock measurement equipment testing/calibration, speed/acceleration/shock measurement, etc., which can solve problems such as fraud and achieve the effect of avoiding measurement conditions

Active Publication Date: 2009-09-23
ZF CV SYST EURO BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most countries in Europe require regular calibration of the tachometer signal, this calibration can easily be avoided or re-falsified by changing the tire afterwards

Method used

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  • Method and device for determining the speed of a vehicle
  • Method and device for determining the speed of a vehicle
  • Method and device for determining the speed of a vehicle

Examples

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Embodiment Construction

[0021] figure 1 A graph is shown to illustrate an exemplary learning range in which the observation of the tachometer signal according to the invention can be carried out. The X-axis corresponds to the speed v of the vehicle, while the yaw rate in ° per second is plotted in relation to the X-axis on the Y-axis. Furthermore, corners with different lateral accelerations aq are shown. If the yaw rate is greater than at least 15° per second, the calibration can basically be carried out, for example based on the method according to the invention. Of course, the values ​​here are only exemplary values. In addition, as long as the car speed is slower than 10km / h, the calibration can be canceled. Depending on the curvature of the bend and the driving speed, a maximum value results, which is indicated by aq_grenz, ie the maximum yaw rate line for the maximum lateral acceleration. A successful test can be carried out in the area bounded by the minimum speed 10 km / h, the minimum yaw ...

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PUM

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Abstract

The invention relates to a device for determining the speed of a vehicle with means for determining the yaw rate of the vehicle, means for determining the curvature of a curve passed through by the vehicle, and means for determining the speed of the vehicle from the yaw rate and the curvature. The invention further relates to a method for determining the speed of a vehicle, comprising the steps: determining the yaw rate, determining the curvature, and calculating the vehicle speed from the yaw rate and the curvature. The curvature can be determined from the difference of the measured wheel speeds.

Description

technical field [0001] The present invention relates to a method and a device for determining the speed of a motor vehicle, in particular a device and a method for comparing the actual speed of the motor vehicle with the speed of the motor vehicle as provided by the tachometer. Background technique [0002] The speed signal traditionally given by the tachometer on a car is based on the rotational speed of the wheels. The downside of traditional tachometers is that wheel speeds are not always a reliable representation of the car's actual speed. Deviations are produced in particular by changes in tire size. If the tachometer is calibrated, for example, with small tires and then large tires are installed, the actual vehicle speed is higher than the reference speed when calibrated. As a rule, and in individual countries, the speed signal displayed by the tachometer is therefore regularly checked. For this purpose, devices are used in which the forward movement speed can be di...

Claims

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Application Information

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IPC IPC(8): G01P21/00B60W40/10
CPCB60W40/105G01P21/00B60W40/10
Inventor 迈克尔·克诺斯曼萨克查·库斯纳尔托比亚斯·蒙科乌尔里奇·冯贝伦托马斯·沃尔夫
Owner ZF CV SYST EURO BV
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