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
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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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