JPS588035B2 - Kōtsuushingouseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traffic signal control device, and more particularly to a traffic signal control device that determines a through band for giving priority to buses in accordance with traffic conditions.

Generally, when a bus passes through a main road, traffic congestion tends to occur due to the difference in travel speed between the bus and other vehicles and the fact that the bus stops at a bus stop or the like.

In order to alleviate such traffic congestion, control devices are used that give priority to buses.

Conventional bus priority control devices perform signal control such as shortening red light times or extending green light times only at individual intersections.

However, the conventional bus priority control device requires a bus sensor to be provided at each intersection, resulting in a complicated configuration and cannot be applied to multiple intersections.

Therefore, a main object of the present invention is to provide a systemized bus-priority cross traffic control device that has a simplified configuration and that targets a plurality of intersections.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 1 is an example of an offset diagram for setting a bus priority through band applied to the present invention.

The bus priority offset is set by the relationship between the distance from one traffic light to the next traffic light and the time required for the bus to travel that distance.

In the figure, there are three intersections between bus stops BS1 and BS2, and traffic lights SG1 to SG3 are provided at each intersection.

Bus sensor DT1 between bus stop BS1 and traffic light SG1
A bus sensor DT2 is installed in front of the bus stop BS2.

Now, from the bus detector DT1 or the point where the bus was detected,
If the distance to the intersection is Li and the time required to travel that distance is ti, then the speed of the bus is V = Li
/ t i.

When this speed is constant, if the distance l is plotted on the vertical axis and the time t is plotted on the horizontal axis, then the offset '(os 1 a, "OS
l b , OS2a)... are set.

The red light time of a traffic light is TR, and the green light time is T.

shall be. TR the red light start time of the first traffic light SG1
1, the second traffic light SG2 and the third traffic light S
The red light start time of G3 is delayed by a time that correlates with the distance and speed, and becomes TR2 and TR3.

The green light band set by this offset is called a through band, and the ratio of the red light time IG in one cycle of the traffic light is called a split.

Furthermore, τ. By extending the green light time by a predetermined amount of time, this is the time during which a bus can pass through a red light without stopping, and is hereinafter referred to as green time extension.

τ1 is the time during which the bus is stopped at a red light by shortening the red light time by a predetermined time, and is hereinafter referred to as red time reduction.

To summarize the invention, when the bus sensor DT1 detects a bus, the time to arrive at the first intersection is calculated.

If the signal at the calculated expected arrival time of -7C is in the red light zone, what is the expected arrival time? If the time from the signal start time is shorter than the predetermined time τ0, the signal SGl in front
The green light time of SG3 is τ.

The estimated arrival time will be a predetermined time from the red light start time.

When the time is longer, the red light time of the traffic lights SG1-SG3 in front is forcibly shortened by τ, and traffic signal control is performed to give priority to buses.

FIG. 2 is a block diagram of an embodiment of the present invention.

The output of the bus sensor DT1 is input to the control circuit CC.

The output of the clock CL is input to the control circuit CC, and
The data is input to the memory ME1.

The timing signal output of the control circuit CC is input to the arrival time calculation table TOT, memories ME1, ME2, correction circuit MC, setting table OFT1, and through band shift value setting table SBT.

The outputs of the arrival time calculation table TOT and the memory ME1 are input to the adder circuit AD.

The output of the adder circuit AD and setting table OFT is the subtracter circuit S.
It is input to U1.

The output of the subtraction circuit SU1 is input to the memory ME2 and also to the control circuit CC.

The output of the memory ME2 and the output of the through band table SBT are input to a subtraction circuit SU2.
The output b is input to the control circuit CC.

The outputs of the setting table OFT and through band table SBT are input to the correction circuit MC. The outputs of the modification circuit Me and the setting table OFT are input to the bus sensitive memory circuit BM.

The output of this bus sensitive memory circuit BM and the setting table OFT
The outputs are input to the traffic lights SG1 to SG3 via AND gates AGI to AG3.

For the bus sensors DTI and DT2, for example, a large vehicle detector that identifies the vehicle type based on a change in the inductance of a loop coil, or an oscillation signal detector that installs a special oscillator on the bus and detects this oscillation signal, etc. is used. .

The setting table OFT includes offset values correlated to the running speed of the bus, red light time TR, and green light time T of the traffic light.

etc. are set in advance.

The through band table SET has a green time extension τ.

Alternatively, a shift value for red time reduction τ1 is set.

The operation of the above configuration will be explained with reference to FIG.

First, let us describe the operation when the green time is not extended and the red time is not shortened.

The bus starts from bus stop BSI at time ST1.

The bus sensor DT1 senses the bus at time to;
A sensing output is provided to the control circuit CC.

Accordingly, the control circuit CC stores the bus sensing time to in the memory MEI.

Furthermore, the control circuit CC controls the arrival time calculation table TOT.
gives a bus sensing signal to

This arrival time calculation table TOT is based on the first
Based on the distance Li at intersection 1 and the traveling speed V of the bus, the expected time ti required for the bus to arrive at the first intersection
is calculated (ti=Li/V).

This expected arrival time ti' and the bus sensing time to stored in the memory ME1 are added by the adder AD (
to tenti) to be done.

The setting table OFT receives a bus sensing signal output from the control circuit CC.

The setting table OFT provides the red light start time TR1 of the first traffic light SG1 to the subtraction circuit SUI.

This subtraction circuit SU1 calculates the green light end time T.

The output time to+ti of the adder circuit AD is subtracted from ten To (where jo is the green light start time), that is, the red light start time TR1 (CTG + To ) - ( to
+t i )) and gives the subtracted output a to the control circuit CC.

This subtraction output is positive (To+'Lo > to+t i
), that is, the green light time T.

If the first intersection is reached within the range of
C gives a signal that does not require modification of the traffic light to the setting table OFT.

Accordingly, the setting table OFT provides an output of a preset signal period to the bus sensitive memory circuit BM, and
The AND gates AG1 to AG3 are activated.

The output of this bus-sensitive memory circuit BM, that is, the preset signal period output as it is, is the AMD gate AGI to AG3.
The signal is given to the traffic lights SG1 to SG3 via.

Therefore, the offset shift control for extending the green time and shortening the red time is not performed for the traffic lights SG1 to SG3.

Next, let us describe the operation when green time extension control is performed.

In the aforementioned through-band shift uncontrolled operation,
The subtraction output of the subtraction circuit SU1 is negative (TO+T).

<to+ti), that is, the green light time T.

If it does not arrive within the range, the subtraction result ((TO+T.

)-(t o+t i )-tri) is stored in the memory ME2.

Further, the control circuit CC sets a blue time extension shift value τ in the through band table SBT.

Give read command.

Accordingly, the shift value τ. is applied to the subtraction circuit SU2.

The subtraction circuit SU2 is a shift value τ for blue time extension.

The value t ri stored in the memory ME2 is subtracted from (τ.

-1;ri)L, and gives its output b to the control circuit CC.

If the subtracted output is positive (to > tri), that is, is the green time extended? .

If the bus is expected to arrive at the first intersection within a time of give.

Accordingly, the correction circuit MC is given the green light end time (T o +Tc) from the setting table GFT, and is further given the green time extension shift value τ from the through band table SBT.

or given. The correction circuit MC is the green light end time To+T
.

and shift value τ. Add (To+T.

+τo)L, amended to extend the green light end time.

The output of this modification circuit MC is input to and stored in the bus sensing memory circuit BM.

Similarly, the green light times of traffic lights SG2 and SG3 are modified and stored.

That is, the bus-sensitive memory circuit BM stores bus stops BS1 and B.
The offset OS1a' of the traffic lights SG1 to SG3 located on the way to S2 stores the green signal end time of the offset OS1a' (see FIG. 1) whose green time is extended by the shift value τ0.

At this time, since the AND gates AG1 to AG3 are activated by the output of the setting table OFT, the output of the bus sensitive memory circuit BM is the AND gate AGI to AG3.
It is given to the traffic lights SG1 to SG3 via.

Therefore, the green time of the traffic lights SG1 to SG3 is controlled to be extended by a predetermined shift value τ0.

Therefore, the bus can pass through the green light extension time without having to stop at the red light.

Next, let us describe the operation when red time reduction control is performed.

In the operation of the green time extension control described above, the subtraction circuit S
If the subtraction output of U2 is negative (τo<tri), that is, if the bus does not arrive at the first intersection within the extended green time, the control circuit CC transmits the red light time shortening command signal. It is applied to the setting table OFT, the through band table SBT, and the modification circuit MC.

Accordingly, the correction circuit MC inputs the sum (To+T) of the green light end time T o + TG and the red light time TR from the setting table OFT.

+TR) output is given, and also a red time reduction shift value τ1 is given from the through band table SBT.

The correction circuit MC subtracts the shift value τ1 from the sum output (To+T.+TR) (To+T.+TR).

+TR-τ1) and amend it to shorten the red light end time.

The output of this correction circuit MC is input to the bus sensitive memory circuit BM and stored therein.

Similarly, the red light times of traffic lights SG2 and SG3 are modified and stored.

That is, the bus-sensitive memory circuit BM stores bus stops BS1 and B.
The offset OS1b of the signals SG-1 to SG3 located on the way to S2 stores the red light end time of the offset OS1b' (see FIG. 1) whose red time is shortened by the shift value τ1.

At this time, since the AND gates AG1 to AG3 are activated by the output of the setting table OFT, the output of the bus sensitive memory circuit BM is the AND gate AGI to AG3.
The signal is given to the traffic lights SG1 to SG3 via.

Therefore, the traffic lights SG1 to SG3 are controlled to shorten their red time by a predetermined shift value τ1.

Therefore, although the bus stops at the red light, the signal waiting time is reduced by the shift value τ1.

The green time extension control or red time reduction control of a traffic light as described above can be similarly performed using other methods, such as a method using a computer.

Next, let's explain a traffic light control method using a computer.

FIG. 3 shows a flowchart of a traffic light control method using a computer.

In step 1, the bus is sensed by the bus sensor DTI.

In step 2, offset OS1 is specified.

In step 3, the green light time (TOTG) of the traffic light SGI at the offset OS1 is read.

In step 4, the first
The expected time ti for arriving at the first intersection is calculated by dividing the distance Li to the first intersection by the traveling speed V of the bus.

In step 5, a reading of the traffic light SGI at the expected time ti when the bus arrives at the first intersection is made.

In step 6, it is determined whether the signal display read out in step 5 is a green light.

If the determination result in step 6 is that the green light is within the green light time, a command is issued in step 7 not to perform corrective control of the traffic light.

If the determination result in step 6 is outside the green light time, that is, within the red light time, then in step 8 the time tri after the start of the red light is derived.

In step 9, a preset green time extension weight value τ.

and the time tri from the start of the red light.

When the determination result in step 9 is tri<τ0, the shift value τ is determined in step 10.

A green time extension command signal is derived.

When the determination result in step 9 is tri>τ0, a red time reduction command signal with a shift value τ1 is derived in step 11.

In step 12, it is determined whether the command signal has been applied to the offset OS1.

If the offset is not given, the next offset is designated in step 13, and the process repeats from step 3.

If given to the offset, the traffic lights SG1 to S
G3 is controlled and ends.

That is, the noteworthy feature is calculating the expected time to arrive at the first intersection from the bus or bus stop.

If the expected arrival time is within the green light time of the first traffic light, the traffic light is not modified.

The expected arrival time is within the red light time of the first traffic light and is a preset time τ from the red light start time.

When the traffic light or green light time is extended,
The time τ at which the red light start time is set in advance.

When it is outside, traffic lights are controlled to shorten their red time.

When the first traffic light or green time is extended or red time is shortened,
Similar control is performed for multiple traffic lights on the way to the next bus stop.

Therefore, systemized traffic signal control of a plurality of traffic lights is performed by one bus sensor output.

In the above embodiment, the case where the bus runs in a one-way traffic zone was explained, but when the bus runs in a two-way traffic zone, bus detectors are installed on both sides, and priority is given to signal control on the side that detects the bus first. Then, similar traffic signal control can be achieved.

As described above, according to the present invention, it is possible to obtain a traffic signal control device that has a simplified configuration and is systematized to give priority to buses and targets a plurality of intersections.

If this invention is installed on the main roads where buses travel, traffic congestion will be alleviated and its practical effects will be significant.

[Brief explanation of drawings]

FIG. 1 is an example of an offset diagram for setting a bus priority through band applied to the present invention. FIG. 2 is a block diagram of an embodiment of the present invention. FIG. 3 shows a flowchart of a traffic light control method using a computer. In the figure, DT is a bus sensor, SG1 to SG3 are traffic lights, CC is a control circuit, CL is a clock, ME1 and ME2
is a memory, AIX is an addition circuit, SU1 and SU2 are subtraction circuits, MC is a correction circuit, TOT is an arrival time calculation table, OFT is a setting table, SET is a through-band shift value setting table, BM is a bus-sensitive memory circuit, AG1~
AG3 indicates an AND gate.

Claims (1)

[Scope of Claims] 1. A plurality of traffic signal display devices provided at each of a plurality of intersections existing between a first bus stop and a second bus stop, comprising: A bus detection means disposed between a first intersection of the plurality of intersections, systematically controlling the plurality of traffic signal display devices, and generating an offset pattern consisting of an alternating repetition period of a green light and a red light. a pattern setting means for setting the first pattern in response to the output of the bus detection means;
means for calculating an expected time of arrival at an intersection, and delaying the red light start time of the traffic signal display device when the expected arrival time of the output of the calculation means is within a red light time zone set by the pattern setting means; and/or modifying means for modifying the pattern output so as to advance the red light end time.