JPH0244226Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device for alerting a traveling vehicle to the detection of an approaching obstacle within a dangerous distance.

In recent years, as a rear-end collision prevention device for vehicles such as automobiles, signal emitting devices such as light beam emitting devices, radio wave emitting devices, or ultrasonic emitting devices are installed in front of the vehicle, and signals such as light beams are emitted from these signal emitting devices forward. At the same time, a receiving device catches the reflected signal such as the reflected beam from the preceding vehicle.
It has been proposed to measure the inter-vehicle distance using the time difference between the emitted signal and the reflected signal and issue a warning accordingly.

However, this device requires complicated calculations such as matching the emitted signal and the reflected received signal, differentiating signal pulses, and integrating circuits, and requires a sophisticated electronic calculator, making it impractical. I have it.

The purpose of the present invention is to eliminate these drawbacks, and by installing a signal receiving device equipped with a modulator in the vehicle, the signal transmitted from the signal transmitting device is converted to a specific wavelength by the modulator. The signal is transmitted as a vehicle-specific modulated signal modulated by the vehicle, and is distinguished from other signals passing through the space to avoid interference, and the signal receiving device is configured to receive only the modulated signal detected by the modulated signal detector. The object of the present invention is to provide a detection device for an obstacle approaching a traveling vehicle, which can reliably detect the approach of an obstacle.

Another object of the present invention is to provide a rotation distribution gear on the rotation shaft of the transmission that rotates the speedometer of the vehicle, and use the rotation distributed from the rotation shaft to rotate a generator to drive the vehicle. By generating a voltage that corresponds to the speed of the vehicle, the modulated signal output from the signal transmitter can be controlled by the voltage that corresponds to the speed of the vehicle, and the amount of modulated signal transmitted can be adjusted. The present invention provides an extremely simple device for detecting obstacles approaching a traveling vehicle, which can detect a dangerous distance to a front obstacle such as a preceding vehicle from the receivable range of the amount of reflected signals, depending on the vehicle's traveling speed. be.

That is, the present invention provides a signal transmitter equipped with a modulator and a signal receiver equipped with a modulated signal detector in a vehicle, and also includes a rotation distribution gear on the rotation shaft of a transmission that rotates the speedometer of the vehicle. The generator is rotated by the rotation distributed from the rotating shaft to generate a voltage corresponding to the vehicle's running speed, and the modulated signal output of the signal transmitter is controlled by the voltage to adjust the vehicle's running speed. The gist of the present invention is a structure of a detection device for detecting an obstacle approaching a traveling vehicle, which is characterized in that the detection distance to the obstacle is automatically expanded or contracted according to the object.

The signals used in this invention include light beams, radio waves,
Ultrasound, etc. can be used.

Next, an embodiment in which a light beam is used as a signal will be described. 1 is a vehicle, a two-wheeled vehicle,
It is an automobile, a railway vehicle, etc., and is equipped with a light beam transmitting device 2 and a light beam receiving device 3 toward the front.
It is preferable that the light beam transmitting device 2 and the light beam receiving device 3 provided toward the front of the vehicle 1 are always in the same direction as the front wheels, so that they rotate left and right in synchronization with the steering wheel operation of the vehicle 1. It is a good idea to leave it as For example, a light emitting diode is used as the light beam transmitting device 2, and the light beam is modulated by a modulator 4 at a specific wavelength in order to distinguish it from other light beams. Reference numeral 5 denotes a light emission output controller, which includes a generator 6 for generating a bias voltage and a variable resistor 7 for varying and correcting the generated bias voltage. The generator 6 generates a voltage according to the running speed of the vehicle 1, and the rotation shaft 8 of the transmission that rotates the speedometer of the vehicle 1.
By providing a rotation distribution gear 9 and rotating the generator 6 with the rotation distributed from the rotation shaft 8, a voltage corresponding to the traveling speed of the vehicle 1 can be obtained very easily. This rotation distribution gear 9 is
If this is housed in a box and detachably attached between the rotary coupler 10 for the speedometer and the rotating shaft 8 of the transmission, it can be easily attached to existing vehicles. The rotation ratio of this rotation distribution gear 9 can be selected as appropriate. Further, as the light receiving device 3, for example, a phototransistor or the like is used, and the modulated light beam is transmitted from the light beam transmitting device 2 so as to receive only the light beam reflected from the obstacle a by the modulated light beam specific to the vehicle. It is equipped with a detector 11, and the received modulated light beam is transmitted to an amplifier 1.
2, the alarm 13 such as a buzzer, flashing light, or red lamp is activated to notify the driver. If this alarm 13 is installed outside the vehicle 1, it is effective because it can be known from outside the vehicle 1 whether or not the vehicle 1 is a dangerous vehicle that is approaching an obstacle a such as a preceding vehicle. It is. Further, an appropriate indicator light may be provided inside or outside the vehicle to know whether or not the device of the present invention is in an operating state.

This invention aims to keep the illuminance constant because the illuminance changes depending on the distance from the light beam, that is, the amount of light that hits a unit area of a surface per unit time (illuminance) is inversely proportional to the square of the distance from the light source. This method utilizes the principle that the distance between the light source and a point at which the illuminance is constant is determined by the amount of light (luminous intensity) emitted by the light source per unit time. A light beam receiving device 3 that receives light with a constant illuminance
A light beam is emitted from the beam transmitting device 2, reflected by an obstacle a in front, and the light beam emitted from the beam transmitting device 2 is determined depending on the reception state of the reflected beam in the beam receiving device 3. The distance from the light beam transmitting device 2, that is, the vehicle 1, to the obstacle a is detected according to the amount of the obstacle a. As the amount of light emitted from the beam transmitter 2 increases, the detection distance range becomes longer, and conversely, as the amount of light emitted decreases, the detection distance range becomes shorter.

According to the present invention, a rotation distribution gear 9 is provided on the rotation shaft 8 of the transmission that rotates the speedometer of the vehicle 1, and the generator 6 is rotated by the rotation distributed from the rotation shaft 8. Therefore, it is possible to generate a voltage according to the running speed of the vehicle 1, and use the generated voltage as a bias voltage to adjust the amount of modulated light beam generated from the light beam transmitter 2 via the modulator 4. , the emitted modulated light beam hits an obstacle a such as a preceding vehicle, and receives a certain amount of light that is reflected by the light beam receiving device 3.
It is possible to detect the distance to an obstacle a such as a preceding vehicle by receiving light, and to know the allowable inter-vehicle distance range according to the traveling speed of the vehicle while automatically expanding or contracting it.

As described above, according to the present invention, since the vehicle is provided with a signal transmitting device equipped with a modulator and a signal receiving device equipped with a modulated signal detector, the signal transmitted from the signal transmitting device is converted into a signal having a specific wavelength by the modulator. The signal is transmitted as a vehicle-specific modulated signal, which is distinguished from other signals passing through the space to avoid interference, and the signal receiving device can receive only the modulated signal detected by the modulated signal detector. Therefore, it has the practical benefit of being able to reliably detect the approach of an obstacle.

Further, according to the present invention, a rotation distribution gear is provided on the rotation shaft of the transmission that rotates the speedometer of the vehicle, and the generator is rotated by the rotation distributed from the rotation shaft. Since the modulated signal transmission output is controlled by the voltage according to the speed of the vehicle, the amount of modulated signal transmitted is adjusted according to the speed of the vehicle, and the amount of reflected signal is adjusted from the receivable range. It has the practical benefit of being able to detect the dangerous distance to obstacles ahead, such as a preceding vehicle, depending on the speed of the vehicle.

In addition, the device of this invention automatically activates the alarm when the vehicle enters a dangerous distance with an obstacle in front and the vehicle slows down or steps on the brake pedal to exit the dangerous distance range. It has the practical benefit of being able to stop the

Furthermore, even if radio waves or ultrasonic waves are used as a signal, it is possible to detect obstacles approaching a traveling vehicle in the same way, and it is also possible to similarly detect obstacles in ships, aircraft, etc.

In addition, if necessary, light transmitting devices 2', 2'' and light receiving devices 3', 3'' are provided at the sides or rear of the vehicle 1, respectively, so that the vehicle 1 can turn left,
Alternatively, when turning right, by operating the direction indicating device, the circuits of the light beam transmitting device 2' and the light beam receiving device 3' provided on the side of the vehicle 1 are closed and the operation is started, so that the vehicle 1 turns right. It monitors the separation range of the danger room on the side, and further closes the circuits of the light beam receiving device 2'' and the light beam receiving device 3'' provided at the rear of the vehicle 1 by switching gears back when the vehicle 1 is moved backwards. It is advisable to start the operation by setting it to 1 and monitor the dangerous distance range behind the vehicle 1. In these cases, there is no need to vary the amount of light emitted by the light beam transmitters 2', 2'' depending on the vehicle's running speed; for example, the amount of light emitted by the light beam transmitters 2', 2'' may be adjusted in advance so that the dangerous distance range is 0.5 to 1.0 meters. All you have to do is do it.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a side view showing the implementation state, FIG. 2 is a block diagram showing the arrangement of the device, FIG. 3 is a wiring diagram of the light beam transmitting device, and FIG.
The figure is a plan view of the main parts. The symbols in the figure are explained as follows. 1
is a vehicle, 2 is a beam transmitting device, 3 is a beam receiving device,
4 is a modulator, 5 is a light emission output controller, 6 is a generator,
7 is a variable resistor, 8 is a rotating shaft, 9 is a rotation distribution gear, 10 is a rotating connector, 11 is a modulation signal detector, 12 is an amplifier, and 13 is an alarm.

Claims (1)

[Scope of utility model registration request] A signal transmitter equipped with a modulator and a signal receiver equipped with a modulated signal detector are provided in the vehicle, and a rotation distribution gear is provided on the rotation shaft of the transmission that rotates the speedometer of the vehicle. The rotation distributed from the generator rotates the generator and generates voltage according to the vehicle's running speed.
An obstacle approaching a traveling vehicle, characterized in that the modulated signal transmission output of the signal transmission device is controlled by the voltage, and the detection distance to the obstacle is automatically expanded or contracted according to the traveling speed of the vehicle. detection device.