JP4932872B2 - Reverse run prevention device - Google Patents

Description

  The present invention relates to a reverse running prevention device for preventing a vehicle from running backward on a one-way road such as an approach road of a toll road.

  For example, in a service area on a toll road (hereinafter referred to as “SA”) or a parking area (hereinafter referred to as “PA”), the entrance and exit of the SA or PA are mistakenly detected, and the SA or PA approaching road is run backward. There has been an accident involving a collision with a vehicle entering PA.

  2. Description of the Related Art Conventionally, a reverse running prevention device has been developed that detects a vehicle that runs backward on a one-way road such as the approach road by using, for example, a microwave and warns the backward running vehicle of backward running (for example, Patent Document 1, Patent) Reference 2).

JP 2005-182256 A JP 2007-140757 A

  By the way, in the conventional reverse running prevention device, when a detection device that detects a reverse running vehicle by radiating microwaves is installed in the approach path of SA or PA, the radiation range of the microwave radiated from the detection device is accurately set. It was difficult to know. Moreover, the approach path and the structure of SA and PA are various, and the angle of the approach path with respect to SA and PA is also various. For this reason, a part of the microwave radiated from the detection device may leak into the SA or PA, and the detection device reacts to a vehicle traveling in the SA or PA, and there is no reverse running vehicle on the approach path. Nevertheless, it was sometimes judged that there was a reverse running vehicle. As described above, when an erroneous detection is caused by the detection device, there is an inconvenience that a false alarm is notified to a regular vehicle traveling on the approach road from the alarm device installed on the approach road.

  In addition, the detection device may cause false detection depending on weather conditions.For example, during heavy rain, the detection device may react to heavy rain and determine that there is a reverse running vehicle even though there is no reverse running vehicle. It was.

  The present invention intends to provide a reverse running prevention device capable of reliably detecting a reverse running vehicle and preventing erroneous detection.

An aspect of the reverse running prevention device of the present invention is installed near the exit of a one-way path, radiates a radio wave to the detection area of the one-way path, and receives a reflected wave from a vehicle in the detection area; An anti-reverse device comprising: an identification unit that identifies a traveling direction of the vehicle traveling on the one-way path by detecting a phase of a pair of signals output from the transmission / reception unit , A first measurement unit that measures the speed of the vehicle based on a pair of signals output from the transmission / reception unit, and a second measurement that measures the time during which the vehicle is detected based on the output signal of the identification unit. A removable detection unit comprising: a calculation unit that calculates a travel distance of the vehicle in the detection area; and a display unit that displays the calculated distance based on output signals of the first and second measurement units and characterized by including an area measuring device That.

  The present invention provides a reverse running prevention device capable of reliably detecting a reverse running vehicle and preventing erroneous detection.

The circuit block diagram which shows 1st Embodiment of the reverse running prevention apparatus of this invention. The figure which shows the system configuration | structure of the 1st Embodiment of this invention. The figure shown in order to demonstrate the range of a detection area. The block diagram which shows the 2nd Embodiment of this invention. The figure which shows the principal part of the circuit structure of the 2nd Embodiment of this invention. The system block diagram which shows the 3rd Embodiment of this invention. The side view made into the partial cross section which shows the 4th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 2 schematically shows an installation state of the reverse running prevention device.

  In FIG. 2, an approach path 32 is provided between the main road 31 and the SA (or PA) of the toll road as a one-way path that branches off from the main line 31 and leads to the SA. The detection device 10 is installed on the SA side (hereinafter referred to as an outlet) of the approach path 32. The detection device 10 detects a vehicle 34 that is going to run backward on the approach path 32 using microwaves. That is, the detection apparatus 10 transmits a microwave to the detection area DA and receives a reflected wave from the vehicle 34 that has entered the detection area DA. Therefore, the detection area DA is set, for example, obliquely from the approach path 32 toward the SA (or PA) side across the approach path 32.

  The detection device 10 is connected to the notification device 19 by wire or wireless. The distance between the detection device 10 and the notification device 19 varies depending on the distance from the entrance to the exit of the approach path 32 and the shape, but in a short time for a reverse traveling vehicle and a vehicle traveling in the forward direction (forward traveling vehicle). It is installed at the optimal position to generate an alarm. The notification devices 19a and 19b are configured by, for example, a display device that displays character information that prompts a warning, or a rotating lamp. When the reverse running vehicle is detected by the detection device 10, the notification devices 19 a and 19 b are driven by the output signal of the detection device 10. The notification device 19a notifies the reverse running vehicle of a warning, and the notification device 19b notifies the forward running vehicle of the warning.

  FIG. 1 shows a first embodiment of the reverse running prevention device of the present invention.

  The detection device 10 includes, for example, a Doppler module 11, a horn antenna 12, an amplifier 13, a variable resistor 14, a filter circuit 15, a traveling direction identification circuit 16, a counter 17, and a communication circuit 18. Among these, the Doppler module 11, the amplifier 13, the variable resistor 14, and the traveling direction identification circuit 16 have the same configuration as that in Patent Document 2 above. That is, the Doppler module 11 is configured by a specific low-power radio device, and generates, for example, a microwave of 24 GHz band (K band) and supplies it to the horn antenna 12, for example. The horn antenna 12 radiates microwaves to the detection area DA. The reflected wave reflected from the vehicle in the detection area DA is received by the horn antenna 12 and supplied to the Doppler module 11. The Doppler module 11 is a known Doppler sensor, detects a received signal, and detects a Doppler frequency from a phase difference between a transmission frequency and a reception frequency. The Doppler module 11 outputs a pair of signals IF1 and IF2 having different phases according to the Doppler frequency. The signals IF1 and IF2 are supplied to an amplifier 13 as a detection area adjustment unit.

  The amplifier 13 is composed of, for example, two variable gain amplifiers that amplify the signals IF1 and IF2, respectively, and the gain of these variable gain amplifiers can be adjusted by changing the resistance value of the variable resistor 14. By changing the gain of the amplifier 13, the detection distance of the vehicle can be adjusted within, for example, a maximum range of 30m, for example, at intervals of 5m. The output signal of the amplifier 13 is supplied to the filter 15. The filter 15 is configured by a band-pass filter that passes through the signals IF1 and IF2, for example, and the signals IF1 and IF2 that have passed through the filter 15 are supplied to the traveling direction identification circuit 16.

  As described in Patent Document 2, the traveling direction identification circuit 16 is composed of, for example, two flip-flop circuits. Of the signals IF1 and IF2 that have passed through the filter 15, the signal IF1 is a clock of one flip-flop circuit. The signal input terminal is supplied to the data input terminal and the clear signal input terminal of the flip-flop circuit, and the signal IF2 is supplied to the clock signal input terminal of the flip-flop circuit and the data input terminal and the clear signal input terminal of the other flip-flop circuit. Supplied. Furthermore, for example, a power supply voltage is supplied to the preset signal input terminals of both flip-flop circuits.

  In the above configuration, the output signals IF1 and IF2 of the Doppler module 11 indicate that the vehicle is traveling in a direction away from the detection device 10 (forward traveling direction) when the phase of the signal IF1 is ahead of the signal IF2. When the phase of the signal IF2 is ahead of that of the signal IF1, it indicates that the vehicle is traveling in the direction approaching the detection device 10 (reverse running direction).

  When the signal IF1 is advanced from the signal IF2, the signal OUT1 is output from the output terminal of one flip-flop circuit. When the signal IF2 is advanced from the signal IF1, the output signal is output from the output terminal of the other flip-flop circuit. OUT2 is output. This signal OUT2 indicates reverse running.

  The output signal of the traveling direction identification circuit 16 is supplied to the communication circuit 18 via the counter 17. The counter 17 is configured by two counters 17a and 17b that count signals OUT1 and OUT2 supplied from the traveling direction identification circuit 16, for example. These counters 17a and 17b respectively count the number of signals OUT1 and OUT2 for a predetermined time. That is, the signals IF1 and IF2 output from the Doppler module 11 change in frequency according to the traveling speed of the vehicle. That is, when the traveling speed of the vehicle is high, the frequencies of the signals IF1 and IF2 are high, and when the traveling speed is low, the frequency is low. For this reason, when the frequency of the signals IF1 and IF2 is high, the number of signals OUT1 and OUT2 generated within a certain time increases, and when the frequency of the signals IF1 and IF2 is low, the signal OUT1 generated within a certain time. The number of OUT2 decreases. The counter 17b counts the signal OUT2 for a certain time, for example, several tens of ms, and outputs a pulse signal when it overflows. By adopting such a configuration, for example, in the case of a moving object of 6 km / h or less, the counter 17b does not overflow. Therefore, a moving object of 6 km / h or less can be removed as noise other than the vehicle, and erroneous detection can be prevented.

  A pulse signal output from the counter 17 b that counts the signal OUT 2, that is, a signal indicating that a reverse running vehicle is detected is supplied to the communication circuit 18. The communication circuit 18 activates the notification devices 19a and 19b based on the output signal of the counter 17. The notification devices 19a and 19b drive a display device and a rotating lamp according to a signal from the communication circuit 18, and warn the reverse running vehicle and the forward running vehicle.

  On the other hand, the detection device 10 includes a measurement device 20 that measures the microwave reach in order to prevent erroneous detection. The measuring device 20 includes, for example, a speed measuring circuit 21, a vehicle position detection circuit 22, a detection area calculation circuit 23, and a display device 24.

  The speed measuring circuit 21 is constituted by, for example, a frequency counter, and counts, for example, the signal IF1 that has passed through the filter 15 for a certain period of time, and converts the frequency into the traveling speed of the vehicle.

  Further, the vehicle position detection circuit 22 detects the travel time of the vehicle traveling in the detection area DA. That is, the vehicle position detection circuit 22 includes, for example, a counter that counts the signal OUT2 output from the counter 17b, and detects the moving time of the vehicle as a count value. The configuration of the vehicle position detection circuit 22 is not limited to this. The signal OUT2 output from the counter 17b is a continuous signal group. For example, a high level is maintained for a certain time (for example, 50 ms) from the rising edge of the first signal of the signal group by a monostable multivibrator. When the next signal is input during this period, the high level is maintained for a certain time (for example, 50 ms) from the rising edge of the signal by the monostable multivibrator. The traveling time of the vehicle can also be measured by counting this high level period with a counter.

  The output signal X of the vehicle position detection circuit 22 and the output signal Y of the speed measurement circuit 21 are supplied to the detection area calculation circuit 23. Based on the output signal X of the vehicle position detection circuit 22 and the output signal Y of the speed measurement circuit 21, the detection area calculation circuit 23 calculates the microwave reachable range (distance B) in the detection area DA from the following equation.

B = Y × 1000 ÷ 3600 × X B: (m), Y: (km / h), X: (s)
The calculated distance B is displayed on the display device 24.

  FIG. 3 shows the relationship between the detection area and the vehicle. For example, when the detection device 10 is installed, the detection device 10 is temporarily installed at an arbitrary angle with respect to the approach path 32. In this state, the vehicle position detection circuit 22 measures the time until the vehicle 41 enters the microwave range radiated from the detection device 10 to the approach path 32 and the vehicle 41 exits the microwave range, The traveling speed of the vehicle 41 is measured by the speed measuring circuit 21. The detection area calculation circuit 23 calculates the above equation using these measurement results, and calculates the distance B along the approach path of the detection area DA. The microwave radiated from the horn antenna 12 of the detection device 10 is radiated symmetrically with respect to the normal line, and the angle formed between the normal line and the approach path 32 is known by measurement. For this reason, the range of the detection area DA can be specified for the detection device 10 in the approach path 32. Therefore, for example, it can be easily recognized whether or not a part of the detection area DA is located in the SA or PA, and the detection area DA is accurately set by adjusting the angle of the detection apparatus 10 with respect to the entry path 32. can do. Therefore, erroneous detection of vehicles in the SA or PA can be prevented.

  According to the first embodiment, the detection device 10 includes the measurement device 20, and the measurement device 20 sets the range of the detection area DA as a radiation range of the microwave radiated from the detection device 10 to the approach path 32. It is possible to measure. For this reason, when installing the detection apparatus 10 in the approach path 32, the microwave radiation | emission range can be confirmed and the installation operation | work of the detection apparatus 10 can be simplified. Moreover, since it is possible to easily recognize whether or not a part of the detection area DA is located in the SA or PA, the installation of the detection device 10 is performed when a part of the detection area DA is located in the SA or PA. The detection area DA can be moved outside the SA or PA by changing the location or the installation angle. Accordingly, it is possible to prevent a vehicle traveling in the SA or PA from being erroneously detected as a reverse running vehicle, and it is possible to improve the detection accuracy of the reverse running vehicle.

  The measuring device 20 is necessary for the installation work of the detection device 10. For this reason, it is also possible to make the measurement device 20 detachable from the detection device 10 and to remove the measurement device 20 after the installation work.

(Second Embodiment)
FIG. 4 shows a second embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals. In the first embodiment, a microwave is radiated from the detection device 10 to the detection area DA to detect a reverse running vehicle. However, the detection accuracy of microwaves decreases due to weather conditions such as heavy rain and snow. Further, in such severe weather conditions, there is a high possibility that a vehicle that reversely travels due to a misunderstanding of the approach road will occur. Therefore, in the second embodiment, the detection accuracy of the reverse running vehicle can be maintained regardless of the weather conditions by the composite detection device further including an infrared sensor or an ultrasonic sensor other than the microwave.

  That is, in FIG. 4, a detection device 51 using, for example, an infrared sensor is provided in the vicinity of the detection device 10. A known configuration can be applied to the detection device 51. For example, the detection device 51 has two infrared light emitting elements and a light receiving element arranged corresponding to them. The two infrared light emitting elements respectively generate infrared rays across the approach road and separated by a predetermined interval in the traveling direction of the vehicle. The detection device 51 detects that light is blocked by the vehicle. For this reason, when using a light emitting element and a light receiving element, the light emitting element and the light receiving element are arranged to face each other with an entrance path therebetween. When using a light emitting element, a light receiving element, and a reflector, the light emitting element and the light receiving element A reflector is disposed on one side and is opposed to these with the approach path in between.

  In such a configuration, when the vehicle crosses two infrared rays, it is possible to determine the traveling direction of the vehicle by determining which infrared ray is blocked first, and to detect a reverse running vehicle Can do.

  FIG. 5 shows a circuit configuration of the second embodiment. In the second embodiment, a heavy rain detection circuit 52 and a detection device 51 using an infrared sensor are provided in the circuit configuration shown in FIG. 1, and only a part of FIG. 1 is shown in FIG.

  The output signal of the counter 17b that detects the reverse running vehicle is supplied to the heavy rain detection circuit 52. The heavy rain detection circuit 52 is constituted by a counter that, for example, counts the output signal of the counter 17b for 5 minutes, for example, and is reset every 5 minutes. Generally, reverse running vehicles do not occur frequently in a short time of 5 minutes. For this reason, if, for example, three counter-running vehicles are detected within 5 minutes by the counter, it is determined that this is not a reverse run but a heavy rain, and the detection device 51 configured by an infrared sensor is activated. The Further, the output signal of the heavy rain detection circuit 52 is supplied to the inverting input terminal of the AND circuit 53. The output signal of the counter 17b is supplied to the non-inverting input terminal of the AND circuit 53. For this reason, when heavy rain is detected by the heavy rain detection circuit 52, the AND circuit 53 blocks the output signal of the counter 17b from being supplied to the communication circuit 18. In this state, when a reverse running vehicle is detected by the detection device 51, the output signal of the detection device 51 and the output signal of the counter 17b are supplied to the communication device 18 via the AND circuit 54. That is, when a detection signal is output from both the detection device 10 and the detection device 51, a signal is supplied to the communication device 18. Thereby, a signal is supplied from the communication device 18 to the notification devices 19a and 19b shown in FIG. 1, and an alarm is notified by the notification devices 19a and 19b.

  According to the second embodiment, the heavy rain detection circuit 52 counts the output signal of the counter 17b for a certain period of time, and if this count value exceeds the reference value, it is determined that there is heavy rain, and the detection constituted by the infrared sensor. The device 51 is activated. For this reason, it is possible to detect a reverse running vehicle using infrared rays even in weather conditions in which it is difficult to detect a reverse running vehicle using microwaves. Accordingly, it is possible to prevent erroneous detection and to reliably detect a reverse running vehicle and prevent an accident. And since the communication apparatus 18 and the alerting | reporting apparatus 19a, 19b are operated based on the detection signal of both the detection apparatus 10 and the detection apparatus 51, the detection precision of a reverse running vehicle can be improved.

  In the second embodiment, the detection device using the infrared sensor has been described. However, for example, an ultrasonic sensor may be used instead of the infrared sensor.

(Third embodiment)
FIG. 6 shows a third embodiment of the present invention. In 1st Embodiment, alerting | reporting apparatus 19a, 19b demonstrated the case where it was a display and a revolving light. On the other hand, the third embodiment shown in FIG. 6 shows a case where the notification devices 19a and 19b are constituted by, for example, a projection device 61. The projection device 61 is activated when a reverse running vehicle is detected by the detection devices 10 and 51 and projects, for example, an entry prohibition sign on the road surface of the approach path 32.

  According to the third embodiment, when a reverse running vehicle is detected, the warning sign is projected on the road surface of the approach path 32 by the projection device 61. In general, the driver usually looks on the road ahead. For this reason, a warning sign such as entry prohibition is greatly projected on the road surface, so that the warning can be prevented from being overlooked, and the driver can be alerted with certainty. Furthermore, since the reverse running of the vehicle often occurs at night, it is possible to improve the alerting effect on the reverse running vehicle and the forward running vehicle by clearly projecting the warning sign on the road by the projector. .

(Fourth embodiment)
FIG. 7 shows a fourth embodiment. The installation location of the detection device 10 is affected by the local weather conditions. For example, in the case where the detection device 10 is installed on an approach path of SA or PA in a heavy snow region, it is necessary to consider that the function is deteriorated due to the detection device 10 being buried in snow. For this reason, it is desired that the height at which the detection device 10 is installed can be adjusted.

  Therefore, in the fourth embodiment, as shown in FIG. 7, the detection device 10 is installed by a column having a height adjustment mechanism. That is, the second support 71 is inserted into the first support 70 on which the detection device 10 is mounted. A plurality of apertures (or screw holes) 72 that can communicate with apertures (or screw holes) 74 provided in the first column 70 are separated from the second column 71 by a predetermined distance in the length direction of the column. Is provided. By attaching a pin (or bolt) 73 to the opening 74 of the first support column 70 and the opening 72 of the second support column 71, the first support column 70 is fixed to the second support column 71. For example, it is possible to prevent the detection device 10 from being buried in snow by attaching and fixing the pin 73 to the opening 72 in a state where the position of the first support column 70 relative to the second support column 71 is adjusted according to the amount of snow. .

  Thus, according to 4th Embodiment, the detection apparatus 10 is installed with the support | pillar which has a height adjustment mechanism. Therefore, it is possible to prevent the detection device 10 from being buried in snow even in a region with a large amount of snow, and to reliably prevent reverse running of the vehicle.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 10 ... Detection apparatus, 11 ... Doppler module, 17a, 17b ... Counter, 20 ... Measurement apparatus, 21 ... Speed measurement circuit, 22 ... Vehicle position detection circuit, 23 ... Detection area calculation circuit, 51 ... Detection apparatus (infrared sensor), 52 ... heavy rain detection circuit (counter), 61 ... projection device, 70, 71 ... first and second columns, 72 ... opening (screw hole), 73 ... pin (bolt).

Claims (5)

A transmission / reception unit that is installed near the exit of the one-way path, radiates radio waves to the detection area of the one-way path, and receives reflected waves from vehicles in the detection area;
An identification unit for identifying a traveling direction of the vehicle traveling on the one-way road by detecting phases of a pair of signals output from the transmission / reception unit;
A reverse running prevention device comprising:
A first measurement unit that measures the speed of the vehicle based on a pair of signals output from the transmission / reception unit;
A second measuring unit that measures the time during which the vehicle is detected based on the output signal of the identifying unit;
A calculation unit that calculates a travel distance of the vehicle in the detection area based on output signals of the first and second measurement units ;
A reverse running prevention device comprising a removable detection area measuring device having a display unit for displaying the calculated distance . Detection means including at least one of an infrared sensor and an ultrasonic sensor installed toward the detection region;
The reverse running according to claim 1, further comprising: heavy rain detection means that counts an output signal of the identification unit for a predetermined time and activates the detection means when the count value exceeds a reference value. Prevention device. A first alarm is installed between the transmission / reception unit and the entrance of the one-way path, and responds to a signal indicating a reverse running vehicle supplied from the identification unit, and issues a warning to a vehicle running backward on the one-way path. The notification means
A second system is installed between the transmission / reception unit and the entrance of the one-way street, and responds to a signal indicating a reverse running vehicle supplied from the identification unit, and notifies a warning to a vehicle traveling in the forward direction on the one-way street. The reverse running prevention device according to claim 2, further comprising:   4. The reverse running prevention device according to claim 3, wherein the first and second informing means comprise at least one of a projection means for projecting warning information onto the road surface and an alarm means installed on the road surface. A detection device including the transmission / reception unit and the identification unit;
The reverse running prevention device according to claim 4, further comprising: a column having a height adjustment mechanism on which the detection device is mounted.

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