JPH0364805B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention can be mounted on a patrol car or the like to measure the inter-vehicle distance between two vehicles to be measured while moving in parallel with the vehicles. The present invention relates to an in-vehicle mobile inter-vehicle distance monitoring device.

(Prior Art) In order to prevent accidents such as rear-end collisions while driving, it is necessary to maintain the correct distance between vehicles while driving. The Road Traffic Act also imposes an obligation on the driver of a vehicle following another vehicle traveling on the same route to maintain an appropriate following distance.

As a method of controlling violations of the obligation to maintain the following distance, there is a method in which an enforcement officer follows the vehicle in a patrol car or the like and visually measures the following distance based on experience.

In this case, the number of lane markings, the number of light poles, etc. are used to estimate the approximate distance.

The inventors of the present invention have developed an inter-vehicle distance monitoring device (Special Publication Publication No. 59-1983) that can accurately measure the inter-vehicle distance.
25280).

This invention maintains a predetermined distance on the vehicle travel path,
This device embeds first and second loop coils and measures the inter-vehicle distance of vehicles passing over the loop coils.

(Problem to be solved by the invention) Although it is possible to issue a warning to those who do not maintain the correct following distance using the above-mentioned method of visual measurement, it is possible to issue a warning to those who do not maintain the correct following distance, but if you try to make it a subject of enforcement, it will be groundless. Many people deny it on the grounds of clarity;
Enforcement of not maintaining the following distance is extremely difficult. Further, according to the above-mentioned inter-vehicle distance measuring device, accurate measurement data can be obtained as a record, but the inter-vehicle distance can only be measured at a location where such a loop is buried.

An object of the present invention is to provide a vehicle-mounted mobile inter-vehicle distance monitoring device that can be mounted on a patrol car or the like and measure the inter-vehicle distance between two vehicles to be measured while moving in parallel.

(Means for Solving the Problems) In order to achieve the above object, the in-vehicle mobile inter-vehicle distance monitoring device according to the present invention basically includes a front vehicle tracking mirror, a rear vehicle tracking mirror, and a front vehicle tracking mirror. A mirror drive unit that independently drives a tracking mirror and a trailing vehicle tracking mirror, and an image of a leading vehicle incident through the leading vehicle tracking mirror and a trailing vehicle image incident through the trailing vehicle tracking mirror. A discriminating optical system that compares images of the vehicle to determine whether tracking is completed, an angle information output circuit that outputs angle information of the preceding vehicle tracking mirror and the following vehicle tracking mirror, and the discriminating optical system, When a match is determined, the distance from the tracking mirror to the vehicle in front and the vehicle behind, the angle between the following vehicle and a line perpendicular to the traveling line of the vehicle equipped with the following distance monitoring device, and the distance between the vehicle equipped with the following distance monitoring device and the following vehicle. It consists of an inter-vehicle distance calculation device that calculates the inter-vehicle distance from the angle formed between a line perpendicular to the traveling line and the vehicle in front.

Another vehicle-mounted mobile inter-vehicle distance monitoring device is configured to refer to the speed of the vehicle equipped with the device, determine whether the inter-vehicle distance is subject to enforcement, and cause the output device to output the data. There is.

Still another vehicle-mounted mobile inter-vehicle distance monitoring device is a photographing device that photographs the preceding vehicle and the following vehicle when the inter-vehicle distance calculation device determines that the inter-vehicle distance exceeds a speed control target. It is configured to take pictures using

(Examples) Hereinafter, the present invention will be described in detail with regard to examples with reference to the drawings and the like.

FIG. 1 is a schematic diagram showing the positional relationship between a vehicle equipped with an in-vehicle mobile inter-vehicle distance monitoring device according to the present invention, a vehicle in front, and a vehicle in rear.

A vehicle in front 2 and a vehicle in rear 3 are traveling in an overtaking lane, and the patrol car 1 equipped with the on-vehicle mobile inter-vehicle distance monitoring device according to the present invention is moving slightly behind them while observing the distance between the vehicles. The case where the distance D is measured will be explained as an example.

Let Ld be the distance between the traveling line of the front vehicle 1 and the trailing vehicle 2 and the traveling line of the patrol car 1.

This Ld has a fixed width of running track, so
In many cases, it can be treated as a constant.

The angle between a line perpendicular to the traveling line of the vehicle equipped with the inter-vehicle distance monitoring device (patrol car 1) and the following vehicle is θ ₁ ,
Similarly, if the angle formed by the vehicle in front is θ ₂ , then the distance La between the vehicle in front 2 and the patrol car 1 in the running direction is given by the following equation.

La=Ld tanθ _2Similarly , the distance Lb between the trailing vehicle 3 and the patrol car 1 in the running direction is given by the following formula.

Lb=Ld tanθ ₁ Therefore, the inter-vehicle distance D between the vehicle in front 2 and the vehicle in rear 3 is given by the following formula.

D=Ld(tanθ ₂ −tanθ ₁ ) The present invention measures the inter-vehicle distance based on the above principle.

FIG. 2 is a perspective view showing the relationship between the front vehicle, the rear vehicle, the tracking mirror of the vehicle-mounted mobile inter-vehicle distance monitoring device, and the discrimination optical system.

FIG. 3 is a circuit diagram showing an embodiment of a tracking mirror, a drive system for driving this mirror, and an angle information output circuit for extracting angle information of each mirror.

Front vehicle tracking mirror 11 and rear vehicle tracking mirror 12
are located in front of the passenger seat of patrol car 1, and each is driven by a different drive means.
They are rotatably supported about a common vertical axis.

The passenger in the passenger seat of the patrol car 1 operates the front vehicle tracking mirror drive setting means 31 and the rear vehicle tracking mirror drive setting means 32 shown in FIG. 3 to set the front vehicle tracking mirror 11 and the rear vehicle tracking mirror. 12 is moved to an arbitrary angle to track the rear left end of the vehicle in front 2 and the front left end of the vehicle in rear 3.

The output of the front vehicle tracking mirror drive setting means 31 is connected to one input terminal of the differential amplifier 21. The other input terminal of the differential amplifier 21 is connected to the output of an angle signal generator 19 rotatably coupled to the tracking mirror 11 for the vehicle in front, and the output terminal of the differential amplifier 21 is connected to the tracking drive motor 17. are connected to form a feedback loop for tracking the set value. As a result, the tracking drive motor 17 rotates the front vehicle tracking mirror 11 to the angular position set by the drive contacting means 31.

Similarly, the output of the front vehicle tracking mirror drive setting means 32 is connected to one input terminal of the differential amplifier 22. The other input terminal of the differential amplifier 22 is connected to the output of the angle signal generator 18 which is rotatably coupled to the trailing vehicle tracking mirror 12, and the output terminal of the differential amplifier 22 is connected to the tracking drive motor 16. are connected to form a feedback loop for tracking the set value. As a result, the tracking drive motor 16
rotates the trailing vehicle tracking mirror 12 to the angular position set by the drive setting means 32.

The image from the front vehicle tracking mirror 11 and the image from the rear vehicle drive mirror 12 are reflected by an index mirror 13 having an index line in the center, and monitored from an eyepiece 14.

The passenger in the passenger seat of the patrol car 1 adjusts each drive setting means 3 so that the images of the rear left end of the front vehicle 2 and the front left end of the rear vehicle 3 overlap, as shown in 14A in FIG.
1 and 32, and when a match is confirmed, perform the match detection operation.

FIG. 4 is a block diagram showing an embodiment of the inter-vehicle distance calculation device and output device of the vehicle-mounted mobile inter-vehicle distance monitoring device according to the present invention.

The outputs of the tracking angle generators 18 and 19 are sent to angle signal output devices 33 and 34 that are composed of A/D converters.
are respectively connected to the angle signal output device 3.
Numerals 3 and 34 convert analog data of the angular position of the vehicle in front into digital data and output the result.

The inter-vehicle distance converter 37 calculates and outputs the inter-vehicle distance D from the angle data θ ₁ , θ ₂ and Ld.

Although the inter-vehicle distance between both vehicles can be measured as described above, the present invention is provided with a recording device and an imaging device in anticipation of actual traffic enforcement.

Since the patrol car 1 is considered to be traveling at approximately the same speed as the following vehicle 3 which is the object of monitoring for the measurement, the speed of the patrol car 1 is detected from the speed output means 35 of the patrol car. ,
The data is input into the permissible inter-vehicle distance converter 38, and the data of the speed and the limit of the inter-vehicle distance allowed for enforcement purposes at that speed are input into the distance determination section 39. The distance determination unit 39 compares the data of the limit of the inter-vehicle distance with the D, and when the D exceeds the limit, the distance determination unit 39 compares the data of the limit of the inter-vehicle distance with the speed of the patrol car 1 (=
Printer 40 uses the speed of the following vehicle as violation data.
Output to. Time data from a clock 36 is connected to the printer 40, and the data is latched by the operator's operation when a match is determined.

The data input to the printer 40 is printed out as shown in FIG. 5 when necessary.

At the same time, a command is issued to the photographing device 42 mounted on the patrol car 1, and the photographing device 42 is operated to photograph the vehicle in front and the vehicle in the rear.

The photographic results and the data printed out by the printer 40 are used for enforcement purposes.

FIG. 6 is a plan view showing another embodiment of the tracking mirror and the discrimination optical system.

In the embodiment described above, measurement was performed when the vehicle in front and the vehicle in rear were traveling in an overtaking lane.

However, in reality, it is often necessary for the patrol car 1 to drive in an overtaking lane and to measure a vehicle running in front on the left.

In the apparatus shown in FIG. 6, an index mirror 13 is provided to be rotatable through 90 degrees, and a pair of tracking mirrors 11, 12 and 11', 12' are respectively provided on both sides of the index mirror 13.

In the case of the embodiment described above, the tracking mirrors 11 and 12
When used in combination with the index mirror 13 located at the position indicated by the solid line, and vice versa, the tracking mirror 1
Index mirror 1 located at the positions indicated by broken lines 1', 12'
3 are used in combination.

(Effects of the Invention) As explained in detail above, according to the present invention,
A front vehicle tracking mirror and a rear vehicle tracking mirror; a mirror drive unit that independently drives the front vehicle tracking mirror and the rear vehicle tracking mirror; and a front vehicle tracking mirror that has entered the front vehicle tracking mirror through the front vehicle tracking mirror. and an image of the trailing vehicle incident through the trailing vehicle tracking mirror to determine whether tracking is completed; and an angle of the leading vehicle tracking mirror and the trailing vehicle tracking mirror. It consists of an angle information output circuit that outputs information, and an inter-vehicle distance calculation device that calculates an inter-vehicle distance D when a match is determined by the discrimination optical system.

Therefore, it is possible to measure the inter-vehicle distance from a moving vehicle.

It is also now possible to compare the inter-vehicle distance with the limit inter-vehicle distance and output the determination result, and at the same time to photograph the vehicle that violates the law.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the positional relationship between a vehicle equipped with an in-vehicle mobile inter-vehicle distance monitoring device according to the present invention, a vehicle in front, and a vehicle in rear. FIG. 2 is a perspective view showing the relationship between the front vehicle, the rear vehicle, the tracking mirror of the vehicle-mounted mobile inter-vehicle distance monitoring device, and the discrimination optical system. Third
The figure is a circuit diagram showing an embodiment of a tracking mirror, a drive system for driving the mirror, and an angle information output circuit for extracting angle information of each mirror. FIG. 4 is a block diagram showing an embodiment of the inter-vehicle distance calculation device and output device of the vehicle-mounted mobile inter-vehicle distance monitoring device according to the present invention. FIG. 5 is a diagram showing an example of output from the printer. FIG. 6 is a plan view showing another embodiment of the tracking mirror and the discrimination optical system. 1...Patrol car, 2...Vehicle in front, 3...
Rearing vehicle, 11... Front vehicle tracking mirror, 12... Rearing vehicle tracking mirror, 13... Index mirror, 14...
Eyepiece section, 16, 17... Tracking drive motor, 18,
19... Tracking angle generator, 21, 22... Differential amplifier, 31, 32... Tracking mirror drive setting means, 3
3, 34... Angle signal output device, 35... Patrol car speed output means, 36... Time signal output means, 37... Distance converter, 38... Permissible inter-vehicle distance converter, 39... Determination device, 40...Printer (output device), 41...Print command input device, 4
2... Photography device.

Claims (1)

[Scope of Claims] 1. A front vehicle tracking mirror, a rear vehicle tracking mirror, a mirror drive unit that independently drives the front vehicle tracking mirror and the rear vehicle tracking mirror, and the front vehicle tracking mirror. a determination optical system that compares an image of the vehicle in front that is incident through the front vehicle tracking mirror with an image of the vehicle that is behind that is incident through the vehicle tracking mirror to determine whether tracking is completed; An in-vehicle mobile type comprising an angle information output circuit that outputs angle information of a rear vehicle tracking mirror, and an inter-vehicle distance calculation device that calculates an inter-vehicle distance D using the following formula when a match is determined by the discrimination optical system. Inter-vehicle distance monitoring device. D=Ld (tan θ ₂ − tan _{θ 1} ) where, Ld: Distance from the tracking mirror to the vehicle in front and the vehicle behind θ ₁ : Distance between the line perpendicular to the traveling line of the vehicle equipped with the following distance monitoring device and the vehicle behind Angle _θ2 : Angle between a line perpendicular to the traveling line of the vehicle equipped with an inter-vehicle distance monitoring device and the vehicle in front. 2. The tracking mirror for the vehicle in front and the tracking mirror for the following vehicle are placed in front of the passenger seat of a vehicle such as a patrol car. An in-vehicle mobile inter-vehicle distance monitoring device according to claim 1. 3. The preceding vehicle tracking mirror and the following vehicle tracking mirror are operated by an occupant in the passenger seat of a patrol car, etc., and the judgment of coincidence by the discrimination optical system is made by the occupant in the passenger seat. The vehicle-mounted mobile inter-vehicle distance monitoring device according to scope 2. 4. A front vehicle tracking mirror and a rear vehicle tracking mirror; a mirror drive unit that independently drives the front vehicle tracking mirror and the rear vehicle tracking mirror; and a front vehicle tracking mirror incident on the front vehicle tracking mirror. a discrimination optical system that compares an image of the vehicle with an image of the vehicle behind that has entered through the rear vehicle tracking mirror to determine whether tracking has been completed; When a match is determined by the angle information output circuit that outputs angle information and the discrimination optical system, the following formula is used to calculate the inter-vehicle distance D, and the distance D is determined based on the speed of the vehicle in which this device is installed. a following distance calculation device that determines and outputs whether the target speed is exceeded; An in-vehicle mobile inter-vehicle distance monitoring device comprising an output device that outputs data such as speed, the inter-vehicle distance, date and time, etc. D=Ld (tan θ ₂ − tan _{θ 1} ) where, Ld: Distance from the tracking mirror to the vehicle in front and the vehicle behind θ ₁ : Distance between the line perpendicular to the traveling line of the vehicle equipped with the following distance monitoring device and the vehicle behind Angle θ ₂ : Angle between a line perpendicular to the traveling line of the vehicle equipped with an inter-vehicle distance monitoring device and the vehicle in front. and a mirror drive unit that drives each independently, and a tracking system that compares the image of the vehicle in front that is incident through the vehicle tracking mirror in front and the image of the vehicle that is behind that is incident through the vehicle tracking mirror in front. When a match is determined by the determination optical system, the determination optical system determines whether the matching has been completed, the angle information output circuit outputs the angle information of the preceding vehicle tracking mirror and the trailing vehicle tracking mirror, and the following is determined by the determination optical system: A following distance calculation device calculates the following distance D using the formula, and determines from the speed of the vehicle in which this device is installed whether the above-mentioned D exceeds the speed limit and outputs the result. an output device that outputs data such as the speed of the vehicle on which the device is installed, the following distance, and date and time, when it is determined that D exceeds the speed limit, and the following distance calculation device; An in-vehicle mobile inter-vehicle distance monitoring device comprising a photographing device that photographs the preceding vehicle and the following vehicle when it is determined that the vehicle is exceeding the speed limit. D=Ld (tan θ ₂ − tan _{θ 1} ) where, Ld: Distance from the tracking mirror to the vehicle in front and the vehicle behind θ ₁ : Distance between the line perpendicular to the traveling line of the vehicle equipped with the following distance monitoring device and the vehicle behind Angle θ ₂ : The angle between a line perpendicular to the traveling line of the vehicle equipped with an inter-vehicle distance monitoring device and the vehicle in front.