Distance measuring device for vehicles

A technology for detecting equipment and vehicle distance, applied in the direction of measuring distance, testing/calibration of speed/acceleration/shock measurement equipment, traffic control system of road vehicles, etc., can solve the problem of unassumed retrieval of vehicle speed pulse, no socket retrieval Vehicle speed pulse and other issues

Inactive Publication Date: 2010-07-14
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] For vehicles with two wheels, external retrieval of vehicle speed pulses is

Method used

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  • Distance measuring device for vehicles
  • Distance measuring device for vehicles
  • Distance measuring device for vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] figure 1 A vehicle distance detecting device 10 according to Embodiment 1 of the present invention is shown. Such a vehicle distance detecting device 10 is provided, for example, in an on-vehicle machine equipped with a GPS receiver.

[0101] The vehicle distance detection device 10 has an acceleration sensor 11 , an A / D converter 12 , a calculation section 13 , an idling frequency storage section 14 , a determination section 15 , and an integration section 16 .

[0102] When acceleration is active, the acceleration sensor 11 outputs an acceleration signal a, which is an analog signal corresponding to the active acceleration. The A / D converter 12 converts the acceleration signal a which is an analog signal into an acceleration signal da which is a digital signal.

[0103] The calculation section 13 performs fast Fourier transform (FFT) calculation of the acceleration signal da. By performing FFT calculations, it is possible to determine how much the frequency compon...

Embodiment 2

[0122] Next, by referring to Figure 4 A vehicle distance detecting device 20 according to Embodiment 2 of the present invention will be described. Such a vehicle distance detecting device 200 is provided in, for example, an in-vehicle machine equipped with a GPS receiver.

[0123] The vehicle distance detection device 20 has an acceleration sensor 21 , an A / D converter 22 , a calculation section 23 , a threshold storage section 24 , a comparison section 25 , and an integration section 26 .

[0124] When acceleration is active, the acceleration sensor 21 outputs an acceleration signal a, which is an analog signal according to the active acceleration. The A / D converter 22 converts the acceleration signal a which is an analog signal into an acceleration signal da which is a digital signal. Acceleration in the X-axis direction (vehicle traveling direction), acceleration in the Y-axis direction (right and left directions of the vehicle), and acceleration in the Z-axis direction ...

Embodiment 3

[0141] Next, refer to Figure 6 A vehicle distance detecting device 30 according to Embodiment 3 of the present invention will be described. Such a vehicle distance detecting device 30 is provided in, for example, an on-vehicle machine equipped with a GPS receiver.

[0142] The vehicle distance detection device 30 has an acceleration sensor 31 , an A / D converter 32 , a calculation section 33 , a determination section 35 , and an integration section 36 .

[0143] When acceleration is active, the acceleration sensor 31 outputs an acceleration signal a, which is an analog signal according to the active acceleration. The A / D converter 32 converts the acceleration signal a which is an analog signal into an acceleration signal da which is a digital signal.

[0144] A tachometric signal ta from a tachometer (not shown) provided in the vehicle is supplied to the calculating section 33 .

[0145] The calculation section 33 performs FFT calculation of the speed measurement signal ta ...

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PUM

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Abstract

The acceleration signal (da) generated by digitizing the acceleration signal (a) outputted from an acceleration sensor (11) is integrated by an integrating section (16) to generate a speed signal (b). This speed signal (b) is integrated to generate a distance signal (c) representing a travel distance. A calculating section (13) determines a vibration frequency having the greatest vibration intensity by FFT calculation. If the vibration frequency having the greatest vibration frequency agrees with the idling frequency stored in an idling frequency storage section (14), a judging section (15) outputs a speed reset signal (R). When the speed reset signal (R) is outputted, the integrating section (16) forcedly changes the value of the speed signal (b) to be integrated to zero so as to prevent an increase of the cumulative error of the speed signal (c).

Description

technical field [0001] The present invention relates to a vehicle distance detection device designed to be able to reduce the cumulative error of the travel distance when detecting the travel distance using an acceleration sensor. Background technique [0002] Radio-based toll collection systems can be used as electronic toll collection systems in toll roads. Using a radio-based toll collection system, communication is performed between a base station installed at a toll booth on a toll road and an on-board or vehicle-mounted machine installed on a vehicle (car) to perform identification and authentication of the vehicle and toll. Dedicated short-range communications (DSRC) are commonly used for communications between base stations and on-board machines. [0003] The use of such radio-based toll collection systems enables vehicles to pass through toll booths in a non-stop and cashless manner. [0004] In addition, the GPS toll system detects the position, travel route, tra...

Claims

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Application Information

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IPC IPC(8): G01C22/00
CPCG01C22/02G01C21/16G01P21/02G01S5/14G08G1/0969
Inventor 饭塚健二森下庆一冈本茂生
Owner MITSUBISHI HEAVY IND LTD
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