JPS62102163A - Speed measuring instrument for mobile vehicle - Google Patents

Abstract

PURPOSE:To measure precisely and accurately the low traveling speed of a mobile vehicle to be measured and to measure also the moving direction of the mobile vehicle by mounting a light emitting body supplying device, a light emission detecting means and a speed measuring instrument on the mobile vehicle and detecting light emission of the light emitting body. CONSTITUTION:The light emitting body supplying device 14 is mounted on the vehicle body 2 set up on casters 30 of the mobile vehicle 1 and the prescribed light emitting substance 26 supplied from a hood 15 is dispersed or dropped to a traveling surface 16. In addition, the 1st and 2nd light emission detecting means 17a, 17b constituting a light emission detecting mechanism, a battery 29 and a control circuit 28 including a speed measuring circuit are mounted on the vehicle body 2. The light emitting body 26 is irradiated by light radiated from an exciting light source 25 on an exciting light optical path 24 in the hood 20 of the light emission detecting mechanism and light emitted from the light emitting body 26 is detected by a photoelectric transducer 21 in the light receiving path 23 of the hood 20 and photoelectrically converted and the electric signal is supplied to a control circuit 28. Thus, the low traveling speed of the mobile vehicle can be precisely and highly accurately measured and the moving direction of the mobile vehicle 1 can be also measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention is directed to emitting light from a light emitting body sprinkled or dropped at the front end of a moving vehicle body.

Detected by w'I& detection means provided in the section.

The present invention relates to a device that measures the moving speed of a moving object (hereinafter referred to as a moving vehicle) based on the time delay of detection time.

[Background of the invention]

Generally, when measuring the running speed of a moving object, if the object has wheels, this is done by determining the rotational speed of the wheels, but there is a method using light as a more accurate speed measurement method. . That is, for example, there is a method using an infrared detector disclosed in Japanese Patent Laid-Open No. 56-112655, and a speed measuring device disclosed in Japanese Patent Laid-Open No. 56-22962.

Another method for measuring speed is a method using a spatial filter. This method uses a spatial filter to observe the optical unevenness that naturally occurs on the running surface, performs spatial signal processing on the obtained irregular signal, and selects a component that has the maximum power among the components of the irregular signal. The speed is measured by finding the so-called center frequency.

However, in these conventional methods, e.g.

When using optical measurement means, errors are likely to occur due to disturbances caused by external light, thermal effects, and when objects other than moving vehicles pass through the optical system path.Also, when using spatial filters, errors are likely to occur, especially at low speeds. The disadvantage is that the measurement error becomes large when measuring.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and the present invention uses a light emitting signal from a light emitting body formed on the running surface when a moving vehicle moves as a marker, and confirms this marker. An object of the present invention is to provide a speed measuring device for a moving vehicle that detects the moving speed of the moving vehicle.

[Summary of the invention]

The speed measuring device of the present invention scatters or drops a luminous material on the running surface at the front part of a moving vehicle to partially form a part where the luminous material is present, and irradiates the luminous material with excitation light. to emit visible light, the light emission is detected by a detection mechanism that detects the light emission of this light emitting body, the moving vehicle moves next, and the moving vehicle is detected from the time required until the second detection means detects the light emission. The present invention relates to a means for measuring the speed of movement of a vehicle.

Here, in the present invention, a light emitting body is used.

This is due to the following reasons.

That is, if one attempts to measure the speed by optically detecting the state of the running surface, i.e., the crack surface, as one mark, the measurement cannot be made unless the crack surface is detected. Also, when the running surface is smooth or the seat surface is homogeneous, is there a problem? -It is impossible to detect and similarly not measure.

On the other hand, when a more aggressive method is used, for example, when a powder that does not emit light is used as a marker, the reflected light or hue from the surface of the powder is detected. However, in this case, it is necessary to illuminate the powder because the illuminance at the bottom of the moving vehicle is insufficient, and the illuminance of the reflected light is low if the material has a low reflectance, and furthermore, it is difficult to separate it from the reflected light from the traveling surface.

On the other hand, in the case of the present invention which utilizes a light emitter, only the light emitter receives excitation light and emits light.

The luminous intensity is much stronger than the reflected light intensity from the running surface (wavelength IIIM in the entire visible light range), but since the luminous body itself has its own unique luminous spectrum, This method takes advantage of the fact that by selectively extracting light, it is extremely easy to detect light emission, that is, read marks.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The speed measuring device for a moving vehicle according to the present invention will be explained below using one embodiment.

FIG. 1 shows the speed measuring device of the present invention, and is a plan view of a moving vehicle equipped with the speed measuring device, and FIG. 2 is a side view of FIG. 1.

In the figure, 1 is a moving vehicle equipped with the speed measuring device of this embodiment. 2 is the car body, which is straight.

C+ C2 is a center line that passes through the center of the mobile vehicle 1 and is oriented in the direction of travel. Straight II S + -8
2, which will be described later, is orthogonal to the center IAC+C2.

This is the axis of the wheel 3.4. Reference numerals 3 and 4 denote wheels fixed to wheel axles 5 and 6 on the axis S+-8z, respectively, at positions equidistant from the center C+-02.

The diameters of wheels 3 and 4 are equal.

7 and 8 are bearings that support the wheel axles 5 and 6, and 9 is a bevel gear fixed to the wheel axles 5 and 6. 10 and 11 are DC motors for driving wheels 3 and 4, respectively. 12 is a reducer attached to the DC motors 10 and 11, and 13 is a bevel gear fixed to the output shaft of the reducer 12, which meshes with the bevel gear 9.

Reference numeral 14 denotes a luminous body that includes a storage tank for an inorganic or organic luminous substance such as a phosphor, a phosphor, a fluorescent dye, and a mechanism for dripping and dispersing (a metered dropping device, a pressure-feeding bonder, etc., none of which are shown). It is a supply device. The light emitter used here is
The most preferred method is one that emits light with visible light, one that is excited by ultraviolet light with a wavelength of 253.7 nm, or one that uses near ultraviolet light such as 360rLrIL.

The light body emits light by excitation with near 360 nm ultraviolet rays.

Organic luminescent materials such as stilbene-based fluorescent dyes are easy to use because they emit clear light in very small amounts.

Reference numeral 15 denotes a cylindrical hood, which is arranged to face the running surface 16 with a space in between, and is provided with a discharge port or a drip hole (not shown) for the light emitting body in the center. This is to prevent the light emitter from being scattered by the wind.

17α and 17b are the first . This is a mechanical part for the second light emission detection means, and its details are shown in FIG. In the figure, a light emission detector 1117 is attached to the vehicle body 2 and supported by support parts 18 and 19. Reference numeral 20 denotes a hood, inside of which there is an optical path 23α for receiving light that includes a photoelectric conversion element 21 such as a photodiode or CdS, and a filter 22, and an excitation light optical path 24 that stores an excitation light source 25 (for example, a black light). This excitation light source 25 has a wavelength of 36
Near ultraviolet rays of 0rLrrL are generated, and the near ultraviolet rays stimulate the light emitter 26 to produce visible light having a longer wavelength than the 360rLrrL ultraviolet rays. Therefore, by passing this visible light through a filter, it is possible to selectively receive it and detect light emission (arrows indicate optical paths). 27 is an amplifier that amplifies the detection signal.

The light receiving and detecting mechanism having this configuration is shown in FIG.

As shown in FIG. 2, the light emitted from the light emitters arranged on the central MCI C2 and scattered or dropped onto the running surface 16 from the light emitter supply device 14 is sequentially observed as the vehicle moves. (If the light emitter has a strong afterglow property and the afterimage does not disappear for a long time, the excitation light source 17b may be omitted). In FIGS. 1 and 2, 28 is a control device including a speed measuring circuit, which inputs the light emission detection signals from the first and second light emission detection means, measures the time lag, and transmits the signals to the outside. Input/output signal processing circuit for display,
(Including clock signal oscillator counter, decoder, etc.)
It consists of a display unit, a speed control mechanism of a moving vehicle, etc.

29 is a storage battery that is a power source, and 3Q is a caster attached to the vehicle body 2.

As shown in the schematic diagram of FIG. 4, the moving speed of the moving vehicle in the structure of FIG.
Travel distance J-2 from Pl to Pl (1 in Figure 1)
This corresponds to the distance J-1 from 7α to 171J. That is, the distance between the light emission detection mechanisms. ), time α at Pl, time at Pl is the time required to move by 12, α=χ, then the average speed ■ can be calculated by V=-.

As a measuring circuit for detecting the light emission detection signal and measuring the speed, there is a method shown in FIG. 5.

That is, the light emitting body 31 is excited by the excitation light source 32 to extract visible light, and the presence of this visible light is detected by the first light emission detection mechanism 33 and the second detection mechanism 34 to obtain the detection signal gl, '2. Next, this detection signal is supplied to the flip-flop circuit 36 via the amplifier N65.

A counter 37 is a clock signal generator and an IM device. First, the amplified output signal of the signal g1 sent from the flip-flop circuit 36 is set to a high level signal, and the counter 37 counts the clock signals during that time. Next, signal e2
When the 11?1 iffl signal is sent, the flip-flop circuit is reset, the output signal becomes a low level signal, and the counter 37 finishes counting. The count signal of this counter 37 is supplied to the decoder 39, and this count signal and the first light reception detection means and the second
The traveling speed of the moving vehicle is calculated based on the relationship with the interval of the light receiving detection means (11 or J-2 in FIGS. 1 and 4), and this is displayed on the display unit 40, whereby the traveling speed of the moving object is You can know the speed.

Above explanation 1. As described above, the speed measuring device of the present invention places a light emitting body on the running surface of the moving vehicle 1 as a marker serving as a reference for speed measurement, and emits light from the light emitting body.

This light emission is observed between two points on the moving vehicle, and the time delay between these points is used to measure the traveling speed of the moving vehicle. There is no reduction in measurement accuracy due to surface irregularities, making it particularly suitable for measuring speed during low-speed driving.

The luminescent material used in the present invention is preferably a stilbene-based fluorescent dye or a coumarin-based fluorescent dye as described above. These dyes are generally water soluble, but are used in combination with lower alcohols to increase the rate of evaporation. The solution is transparent and leaves almost no trace after drying.
Do not contaminate the running surface. The emission color of this dye is wavelength 43
It is a purple color with a peak at 0 to 440 nm.

The luminescent material supplying device in the embodiment is separate from the running surface and is of a type that sprays or drops on the running surface, but as another means, a mark imprinting mechanism is provided in a part of the supplying device and luminous material is applied to the running surface. Alternatively, a mark may be stamped and read.

Next, regarding the light emission detection mechanism, in the embodiment, a case has been described in which two light emission detection mechanisms are provided. This is because at least two sensors are required to measure speed, and in this case the detection signals are also two, but a light emission detection mechanism may be added, or a line sensor may be used as a photoelectric conversion element. Using this will further improve detection accuracy and reliability.

Although not shown in the examples, if a luminescent material is dropped intermittently at regular intervals, the luminescence is detected, its trajectory is determined, and the positional relationship with the wheels and central axis of the vehicle is determined. It is also possible to measure the direction of movement of a moving vehicle.In this case, the trajectory can be projected onto a display using a television camera to control the vehicle's travel, or it can be equipped with arithmetic and control circuits.
Vehicles can be driven automatically.

In the example, it is assumed that a moving vehicle travels from C1 to C2 on the center #il C+ 7 C2, but if it stops mid-travel and starts traveling in the opposite direction. There may be cases where it is impossible to measure the traveling speed, but if you consider these cases and install the luminous material supply device not only at the front of the vehicle but also at the rear, the range of uses will be further expanded. do.

In addition to determining the presence or absence of light emission, the light emission detection signal of the light emitter may be a peak value of light emission, an integral value of the area of the light emitting part, or the like.

゛ [Effects of the Invention] As explained above, according to the present invention, in which a mobile vehicle is equipped with a luminous body supply device, a luminous body detection means, and a speedometer 1iill device, by detecting the luminous emission of the luminous body, Reliably detects the particularly low speed of the moving vehicle being measured.
Measurements can be made with high precision, and the direction of movement of the vehicle can also be measured. Furthermore, the device of the present invention does not require an expensive velocity gauge 1 or an azimuth angle measuring device, so it is highly economical.

[Brief explanation of drawings]

FIG. 1 shows a speed measuring device for a moving vehicle according to an embodiment of the present invention, and FIG. 2 is a plan view of a moving vehicle equipped with the device.
3 is a partially cutaway sectional view of the light emission detection mechanism in FIG. 1, FIG. 4 is a schematic diagram for explaining the speed measurement method according to the present invention, and FIG. 5 is a movement according to the present invention. FIG. 3 is a circuit diagram for measuring the speed of a car. 1: Mobile vehicle, 14: Luminous body supply device, 17
: Light emission detection mechanism, 21: Photoelectric conversion element, 25: Excitation light source, 26: Light emitter, 28: Control circuit. Proxy Masu Burialist Masaru Shokawa - Male Figure 1 Figure 2 Figure 3 Figure 4 z Takema

Claims (1)

[Claims] 1. means for scattering or dropping a small amount of luminescent material from a running vehicle body onto a running surface; a light source means for exciting the luminous material; a detection means for detecting light emission from the luminous material; and the detection means. In a moving vehicle equipped with a signal processing means for processing the detection signal obtained by converting the detected signal into a speed signal, the light emitted from the luminous material scattered or dropped from the front part onto the running surface while the moving vehicle is running is The light emitted from the light emitting body provided at the rear of the moving vehicle and on the running surface after the moving vehicle has been moved is detected by one or more second light emitting means.
a time delay between the luminescence detection signals detected by the two detection means;
A speed measuring device for a moving vehicle, comprising a mechanism for measuring the moving speed of the moving vehicle based on the distance traveled by the moving vehicle.