JPH0410680B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention not only grasps the running position of the bus at the operation control center, but also displays the approximate current operating point of the bus at the bus stop, and notifies route bus users of the approach of the bus. This invention relates to a bus approach display device that provides services.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a bus operation control center device (hereinafter referred to as the center) that grasps the running position of the bus and manages its operation. In the center 1, 12 transmits a polling signal p and receives bus information b. A base station radio, 13 a base station antenna, 11 a central control unit for processing bus information, and 14 a bus operation display panel for displaying the running status of the bus 2. 2 is a bus (mobile station); in the bus 2, 21 is a mobile station antenna;
Reference numeral 22 denotes an on-vehicle radio device that transmits bus information b between the bus 2, the center 1, and the bus stop, and constitutes an on-vehicle transceiver 20. , 23 is a route guide broadcasting device 24
is an in-vehicle device mounted on bus 2. 3 is a stop indicator; as a roadside device 30, 31 is an antenna; 32 transmits a trigger signal t including a route number and a stop number; receives bus information b from bus 2; and further processes the bus information. The on-road transceiver 33 is an approach display unit that processes bus information from the on-road transceiver 32 and notifies bus users of the approach of the bus according to the results.

It would be convenient for users of route buses if the current bus position was displayed at each bus stop when the route bus runs through multiple bus stops. And the conventional bus approach display device is "1" at the bus stop.
Approaching displays such as ``Passing one bus stop ahead'' or ``Passing two bus stops ahead'' are displayed. Here, the bus location uses the bus stop name of the route. The basic idea of the approach display method is that while the bus is in operation, if the bus position information is transmitted to the next bus stop that it will arrive at sequentially according to the order in which it passes through the bus stops, then the approach of the bus can be displayed,
It is based on that. In reality, a unique number, including the stop number, etc., is assigned to a bus stop in advance, and as the bus travels, the unique number of this bus stop is sequentially transmitted wirelessly to the next bus stop. , a bus approach display is displayed. In addition, there are usually many buses on the route,
When individual buses arbitrarily transmit wirelessly to a bus stop, bus position information from multiple buses may conflict with each other and may not be received satisfactorily. In order to avoid this, a polling method from a traffic control center (hereinafter referred to as "center") is usually used to give instructions to the bus regarding the timing of transmitting position information.

Next, the operation will be explained. In Figure 1,
In the bus operation control center 1, in order to collect bus information b such as car number, system, route number, stop number, etc. from a large number of buses 2 without interference using one frequency f1, as a reference signal, polling signal p
However, from the central control device 11, the base station radio 12,
It is transmitted to the bus (mobile station) 2 via the base station antenna 13. As a result, the in-vehicle radio 22 of the bus 2 transmits the bus information b via the mobile station antenna 21 at each pre-assigned time slot.
are transmitted to the center 1 and the stop display 3 of each bus stop without colliding with each other.

Therefore, at center 1, base station antenna 1
3. Central controller 11 via base station radio 12
However, bus information b for all buses 2 on the route can be collected. Then, this central control device 11 determines the running position of each bus from the bus information b of all buses 2, and displays the running position of each bus on the bus operation display panel 14 based on the bus information b at the time of polling. indicate.

Next, the bus information stored in the onboard radio device 22 of the bus 2 is updated as follows. That is, usually
The stop indicator 3 of the bus stop intermittently transmits a trigger signal t containing its own stop number etc. to the bus 2 using weak radio waves. When the in-vehicle radio 22 of the bus 2 receives this trigger signal t, it reads the stop number etc. included in the trigger signal t, adds its own car number, and temporarily stores it internally as bus information b. Furthermore, the bus 2 moves ahead and transmits the trigger signal t from the next bus stop to the onboard radio 22.
When the bus information b is received, the previous bus information b is updated. Incidentally, since route buses are usually one-man buses, in order to reduce the burden on the driver, when the onboard radio 22 receives this trigger signal, the route guidance broadcasting device 23 is linked to provide stop information to the inside of the vehicle. I have to.

As another means of setting the bus information b, information on the inside and outside of the bus, as well as route numbers and stop numbers, are recorded in advance on two tracks of the tape of the route guidance broadcasting device 23, and the route number is set using the trigger signal t. When the guide broadcasting device 23 operates, there is a method of reading the route number and stop number from this information and storing it.

Next, when the in-vehicle radio 22 receives the polling signal p from the center 1, the bus information b is wirelessly transmitted to the center 1 and the stop display 3 of each bus stop on the route.

Since the processing of bus information at the center 1 has already been described, next we will describe the approach display contents of the stop indicator 3 on the road.

The stop indicator 3 includes an antenna 31, an on-road transceiver 32, and an approach indicator 33.
The on-road transceiver 32 includes a microcomputer (not shown) and stores unique numbers (route number and stop number) assigned to each stop. Usually, this unique number is transmitted as a trigger signal t.

Now, as shown in FIG. 2a, while the bus 2 is traveling between the bus stops B1 and B2, the on-vehicle radio 22 receives the trigger signal t from the bus stop B1 and then passes the bus stop B1. Therefore, as bus information b, the car number, route number, and stop number B1
(Unique number of bus stop B1) is stored. At this time, upon receiving the polling signal p from the center 1, the in-vehicle radio 22 sends the bus information b to the center 1, and also sends information including the stop number B1 to each stop display 3 on the route. bus information b. At this time, each stop indicator 3
The built-in microcomputer of the on-road transceiver 32 detects whether the information is related to its own display, and if so, performs a display operation.

That is, if the bus stop number in the received bus information b is one or two fewer than its own unique number, the on-road transceiver 32 sends the bus to the bus stop one or two stops before. When it is determined that the vehicle is approaching a bus stop, the approach lamp of the approach display section 33 is turned on, or the magnetic reversal element with a picture of a bus on one side is activated. That is, this is the second
Stop indicator 3 for bus stop B2 and bus stop B3 in diagram a
This corresponds to the operation of If the vehicle number and stop number match, the on-road transceiver 32 determines that the bus 2 has arrived at the bus stop, and either turns off the approach lamp on the approach display section 33 or operates the magnetic reversal element. to eliminate the approaching display.

Next, as shown in FIG. 2b, when the bus 2 receives the trigger signal t from the stop indicator 3 of the bus stop B2 with its onboard radio 22, the bus information b
becomes the car number, route number, and stop number B2.
After receiving this trigger signal t, from center 1,
Upon receiving the polling signal p, the in-vehicle radio 22
wirelessly transmits the bus information b including this stop number B2 to the stop display 3 of each bus stop on the route.
As a result, on the stop display 3 of the bus stop B2, since its own unique number and bus information b match, the approach lamp of the approach display section 33 is turned off. Also,
The stop indicators 3 of bus stop B3 and bus stop B4 are one or two fewer than their own unique numbers, so
Each turns on its approach lamp.

The purpose of this device is to have the center track the running positions of a large number of route buses, and also use polling signals sent from the center to send bus information from buses to bus stops. Therefore, the bus approach lamp is turned on and off only on the stop indicator associated with the bus stop to inform the user that the bus is approaching.

However, since the bus runs on multiple routes and moves, the positional relationship between the bus position and the bus stop at the time of polling from the center is not always the same and varies, and essentially, There is variation in the timing of the approach display on the stop indicator, and as a result, the content of the approach display tends to be inaccurate. Therefore, there are some bus stops where the approach indicator lamp does not turn off even after the bus has passed the bus stop. In this case, for example, in Figure 2a,
As the bus 2 travels along the route, the running position at which it receives the polling signal is as shown in the figure, and the running position at which the bus 2 travels and receives the next polling signal is between bus stops B3 and B4. Let's take the example of time as an example.

First, the first signal received between bus stops B1 and B2
In response to the second polling signal p, the stop display 3 of bus stop B2 turns on the lamp indicating "passing one bus stop before", and similarly, the stop display 3 of bus stop B3 lights up the lamp indicating "passing the bus stop two stops before". Turn on the lamp indicating "Medium". However, after that bus stop B2
If the polling signal p is not received even after passing the bus stop B2, the bus 2 continues ahead without turning off the bus stop indicator 3 of the bus stop B2, and after passing the bus stop B3, the second polling signal p is transmitted to the onboard radio. 2
When the bus 2 receives the trigger signal t (including the stop number B3) when passing the bus stop B3, the bus information b stored in the onboard radio 22 includes the car number, route number, and stop. number B3, and as a result bus 2 receives the polling signal p.
At the timing of , this bus information b is sent to center 1,
It is transmitted to each stop indicator 3. As a result,
The roadside transmitter/receiver 32 of the bus stop B2 compares its own unique number with this bus information b, and as a result, the stop number is one more, so the approach lamp that is already lit on the stop display 3 remains lit. Leave it as it is,
It won't turn off.

Also, at this time, the approach indicator lamp on the stop indicator 3 of bus stop B3 matches its own unique number and the bus information b received by the roadside transceiver 32, so
The lights are turned off. In this way, each stop indicator 3
is operating, while bus 2 is operated further and further ahead.

As described above, in this device, the reliability of the display contents of the stop display is closely related to the polling cycle of the center 1, the bus position at the time of polling, and the positional relationship with the bus stop.

Conventional bus approach display devices are configured as described above, so the timing of turning on and off the approach lamp of the stop indicator is based on the bus position at the time of polling (before the bus stop, bus stop, after passing the bus stop, etc.) and the stop. There are variations because it depends on the relationship with the location, and there is essentially a disadvantage that the approach lamp lighting of the approach indicator on the stop indicator is inaccurate, especially the lamp extinguish time, and the reliability of the approach indicator is low.
In addition, there are fewer people boarding and alighting at night, the time required for buses to travel to the bus stop becomes shorter, the timing does not match the polling cycle, and there are disadvantages such as the approach indicator lamp remaining lit even after passing the bus stop. Ta.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and in addition to receiving the polling signal from the center, the in-vehicle radio receives a weak trigger signal from the roadside transceiver of the stop indicator. When the bus passes in front of the stop display, the approach lamp on the approach display will always be turned off by turning back and sending back an acknowledgment signal using weak radio waves to the roadside transmitter/receiver of the stop display. The purpose of the present invention is to provide a bus approach display device that can be used.

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

One embodiment of the present invention has a center 1 as well as the conventional one.
It is composed of an on-vehicle radio 22 and a stop indicator 3, of which the center 1 and the devices therein, and the stop indicator 3 and the devices therein have the same structure as shown in FIG. The on-vehicle wireless device 22 mounted on the bus 2 has a configuration as shown in FIG. That is, in FIG. 3, 21 is a mobile station antenna, 22 is an in-vehicle radio, and 23 is a route guide broadcasting device.
At the same time, it receives a trigger signal t including the stop number transmitted from the on-road transceiver 32, and transmits an acknowledgment signal r including the car number of the bus 2 and the stop number in this trigger signal t. In the machine 22, 221 is its antenna switching unit;
22 is a receiving section, 223 is a control section for controlling the in-vehicle radio 22, and 224 is for decoding the bus information b received by the receiving section 222 and the bus information b prerecorded on the tape of the route guide broadcasting device 23. An information reading section 225 is a high-power transmitting section that transmits bus information b which is a response signal to the polling signal p from the center 1, and 226 is a response signal to the trigger signal t transmitted from the roadside transceiver 32 of the stop indicator 3. A weak output transmitting section 227 that transmits the acknowledgment signal r is a power supply section of the in-vehicle radio 22.

The stop display 3 has the same configuration as the conventional one, but it transmits a trigger signal t including the stop number using weak radio waves so that the transmission reach area a does not overlap with other stops, and also sends a trigger signal t including the stop number to the stop in the received bus information b. In addition to displaying approaching numbers according to the number, on-vehicle radio 2
A function is added to cancel the approach display when the acknowledgment signal r from 2 is received.

Next, the operation will be explained.

When a route bus receives at least one polling signal between all bus stops on the route, conventional bus approach display devices display the approach according to the running position of the bus. Even after the bus passes the bus stop, if the approach lamp is on, the bus will operate normally without any problems.

However, during slow traffic hours or at night,
On routes where there are few people getting on and off and many bus stops passing through, the bus unexpectedly travels between bus stops in a short period of time, and as it travels along the route, it may not be able to receive polling signals between some bus stops. It happens that you drive in a state. In such cases, with conventional devices, for example, even after the bus has passed the bus stop, the stop indicator displays "one stop closer" or "two stops closer" and the approach lamp remains lit.
That is, the turning off of the approach lamp is completely related to the timing at which the in-vehicle radio receives the polling signal from the center.

In this device, measures have been taken for the in-vehicle radio to improve the above-mentioned drawbacks, which will be explained using FIG. 3.

Normally, the polling signal p from the center 1 is transmitted to the antenna 21 of the vehicle radio 22 and the antenna switching unit 2.
21, the in-vehicle radio 22 receives the bus information b via the control unit 223.
is taken out from the information reading unit 224, and sent to the center 1 via the control unit 223 and further in its own time slot.
And for the stop display 3 of each bus stop on the route,
The bus information b is transmitted from the mobile station antenna 21 via the high power transmitting section 225 and the antenna switching section 221. In addition, the in-vehicle radio 22 transmits the trigger signal t from the bus stop display 3 to the mobile station antenna 2.
1. Receiving unit 22 via antenna switching unit 221
2, this trigger signal t is received by the control unit 22.
3, is decoded by the information reading unit 224, and adds its own vehicle number as an acknowledgment signal r.
The signal is sent back to the bus stop indicator 3 as a weak radio wave from the mobile station antenna 21 via the control section 223, weak output transmitting section 226, and antenna switching section 221.

Now, when the polling signal p from the center 1 is received by the in-vehicle radio 22 at least once between bus stops, it operates normally like the conventional device, so its explanation will be omitted here.

Next, a case where the polling signal p is not received between bus stops will be explained.

FIG. 4a shows that when the bus 2 travels from the bus stop B1 to the bus stop B4, the Nth polling signal p from the center 1 is received between the bus stop B1 and the bus stop B2, and the bus 2 receives the Nth polling signal p from the center 1 between the bus stop B1 and the bus stop B2. This shows a case where the (N+1)th polling signal p is received between the bus stop B2 and the bus stop B4, and the approach display status of the stop indicator 3 of the bus stop B2 and the bus stop B3 in this case will be explained.

In Fig. 4a, while the bus 2 is running on the route, the bus information b (route number, stop number, car number, etc.) stored in the on-board radio 22 is basically always the bus information b that is stored in the vehicle radio 22 while the bus 2 is traveling on the route. Contains the bus stop number.

Therefore, when the in-vehicle radio 22 receives the Nth polling signal p, the bus 2 transmits the current bus information b to the center 1 and the stop display 3 of each bus stop. That is, bus stop B
In the bus information b, the bus stop number that is one or two fewer is sent to the stop indicator 3 for bus stop B2 and bus stop B3. At this time, the stop indicator 3 of bus stop B2 lights up the approaching lamp which means that the bus 2 is currently passing through one bus stop before, and similarly,
On the stop indicator 3 of bus stop B3, an approach lamp indicating "passing two bus stops ahead" is lit.

Furthermore, the bus 2 travels along the route and enters the trigger signal reach area a of the bus stop B2 as shown in FIG. When the in-vehicle radio 22 receives t, it decodes the contents, adds the own car number in addition to the route number and stop number B2, returns the signal, and sends a weak radio signal to the bus stop indicator 3 for bus stop B2. , it is sent as an acknowledgment signal r.

As a result, the stop indicator 3 of the bus stop B2, upon receiving this acknowledgment signal r, turns off the approach lamp indicating "approaching one bus stop ahead" with the signal from the same bus 2. That is, the approaching lamp is turned on and off based on information from the bus having the same car number, and the approaching lamp is surely turned off in response to the bus 2 passing the bus stop B2. Furthermore, if the bus 2 enters the reach area a of the trigger signal t issued by the stop indicator 3 of the bus stop B3 after passing the bus stop B2, similarly,
Between the onboard radio 22 of the bus 2 and the stop display 3,
Communication is carried out using weak radio waves. As a result, the approaching lamp "passing two bus stops ahead" on the stop display 3 of bus stop B3 is also turned off by the bus with the same car number.

In this case, even while the bus 2 is passing the bus stop B2, the display 3 of the bus stop B3 is displaying "passing two bus stops ahead", and the display 3 of the bus stop B3 shows the actual running state of the bus 2. Not shown accurately.
However, with the conventional device, even if Bus 2 passed bus stop B3, the approach lamp would remain on as usual, but with this device, at least when the display differs from the actual situation, The approach lamp is turned off when bus 2 passes bus stop B3. Furthermore, the bus 2 moves forward and after passing the bus stop B3, the (N+
1) When the th polling signal p is received from the center 1, the in-vehicle radio 22 of the bus 2 transmits the bus information b to each stop display 3, similarly to when the Nth polling signal p is received. Since we will send
On the stop display 3 of bus stop B4, the approaching lamp lights up saying "passing one bus stop before", and on the stop display 3 of the bus stop B5 ahead, the approaching lamp "passing two bus stops ahead" lights up. The correct action of turning on the light will be performed.

As described above, according to the present invention, when the in-vehicle radio receives a weak trigger signal from the roadside transmitter/receiver of the stop indicator other than when receiving a polling signal from the center, it returns the signal and sends/receives the stop indicator's on-road transmission/reception. The system is configured to send an acknowledgment signal back to the bus using weak radio waves, and is configured to ensure that the approach lamp is turned off when the bus passes the bus stop, improving the reliability of the contents displayed on the bus stop display. effective.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a conventional bus approach display device, FIG. 2 is a diagram showing the communication situation in the device of FIG. 1, and FIG. 3 is a bus-mounted device of a bus approach display device according to an embodiment of the present invention. FIG. 4 is a block diagram showing a communication situation in a bus approach display device according to an embodiment of the present invention. 1 is the bus operation control center device, 2 is the bus, 1
1 is a central control unit, 12 is a base station radio, 24 is an in-vehicle device, 30 is an on-road device, 32 is an on-road transceiver, and 33 is an approach display unit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. Bus operation control center device 1 and on-vehicle device 2.
4 and a roadside device 3, the center device 1 receives bus information from a base station radio 12 and transmits a polling signal from an on-vehicle device 24, and a central control device 11. The on-vehicle device 24 is mounted on the bus, and the on-vehicle transceiver 20 receives the polling signal from the center device 1. In response to this, the bus information including the number of the nearby stop is transmitted with high power, and when the bus approaches the stop, a trigger signal including the stop number is transmitted from the on-road device 3 using weak radio waves,
In response, an acknowledgment signal including the bus number and its stop number is transmitted using weak radio waves.The on-road device 30 is installed at each bus stop, and the on-road transceiver 32 transmits a trigger signal using weak radio waves. The bus approach display device receives bus information and an acknowledgment signal from the on-vehicle device 24, and the approach display unit 33 displays an approach display based on the bus information, and cancels the approach display based on the understanding signal.