JP4808243B2 - Traffic signal control apparatus and traffic signal control method - Google Patents

Description

  The present invention relates to a traffic signal control device and a traffic signal control method for controlling signal lamps provided at a plurality of intersections of a road according to traffic demand, and particularly to performing optimal control by predicting traffic demand in the near future. .

  In order to ensure the safety and smoothness of automobile traffic, it is necessary to appropriately control signal lamps provided at road intersections. In this traffic signal control, in order to cope with a sudden change in traffic conditions, the traffic signal control device disclosed in Patent Document 1 uses the current traffic time information based on the outflow traffic flow information from the adjacent intersection and the travel time from the adjacent intersection. Create an inflow traffic flow table indicating the predicted inflow quantity in the prediction range from a certain time up to 0 seconds, for example, 300 seconds before to 300 seconds later, and between the created inflow traffic flow table and the current time, for example, 300 seconds before Compared with the actual inflow traffic volume, the arrival timing of the inflow traffic table focusing on the change points where the inflow traffic flow table created and the measured inflow traffic flow volume rise from small to large That is, the travel time from the upstream intersection to the downstream intersection is corrected. The inflow traffic flow table is created and the arrival timing correction based on the actual measurement value is updated every 10 seconds, for example, the signal control parameter is calculated using the updated inflow traffic flow table, and the cycle length is calculated based on the traffic demand in the near future. And have decided to split. In this case, the offset, which is the deviation of the blue display start time from the upstream traffic signal, is transmitted by the central management device via the transmission path to which the traffic signal control device provided at each intersection is connected and set as a specified value. . For this reason, if an abnormality occurs in the central management device and it becomes unable to perform its function, it must depend on the offset previously set in the traffic signal control device, and optimal control according to changes in traffic conditions Could not do.

  In order to set this offset by the central traffic signal control device, the traffic signal control device shown in Patent Literature 2 uses the number of vehicles passing through the link and the difference between the actual travel time and the target travel time of the link. An offset is set. In addition, the traffic signal control apparatus disclosed in Patent Document 3 calculates a relative offset constraint condition based on the difference between the blue time seconds of the adjacent intersection and the blue time seconds of its own intersection, the distance between the links, and the system speed. Based on the calculated relative offset constraint condition, the number of blue hours / seconds of the own intersection is determined by searching for an optimal solution that minimizes the delay time, the number of stops, and the like.

  However, although the traffic signal control apparatus shown in Patent Document 2 and Patent Document 3 can obtain the minimum solution of delay and the number of stops for each link, the sub-area as a whole cannot always obtain the optimum solution that is minimized. Therefore, it is difficult to perform appropriate control according to a sudden change in traffic conditions.

In addition, the method for predicting the timing at which the vehicle group that departs from the upstream intersection in Patent Document 1 arrives at the downstream intersection is based on a traffic state in which the vehicle can travel freely. In a traffic jam state, it depends on the traffic signal control parameters transmitted from the central control unit to each traffic signal control device, or on the traffic signal control parameter multi-stage program set in each traffic signal control device in advance. I must. For this reason, when an abnormality such as a failure occurs in the central management apparatus and the traffic control signal control parameter is not transmitted from the central management apparatus, it is difficult to perform optimal control according to the traffic congestion state.
Japanese Patent No. 4159976 Japanese Patent Laid-Open No. 7-152993 JP 2006-119754 A

  The present invention improves such a problem and automatically calculates an offset as well as a cycle length and a split that reliably correspond to a change in traffic conditions, and is optimal without depending on a central management device in any traffic conditions including a traffic jam condition. It is an object of the present invention to provide a fully autonomous distributed traffic signal control apparatus and a traffic signal control method capable of performing control.

The traffic signal control device according to the present invention creates and creates an inflow traffic flow table indicating an estimated inflow number during a certain period of time before and after the current time based on outflow traffic flow information from an adjacent intersection and travel time from an adjacent intersection. Compare the inflow traffic flow table with the actual inflow traffic flow measured for a certain time before the current time, and the created inflow traffic flow table and the measured inflow traffic flow volume from small to large A signal that calculates the cycle length and split based on near-term traffic demand using the updated inflow traffic flow table by correcting the arrival timing of the inflow traffic flow table by paying attention to the rising change point and updating it every predetermined time In a traffic signal control device that has a control constant calculation unit and controls signal lamps provided at each intersection of a road, a central processing unit, an automatic offset calculation unit, and a control unit in a traffic jam The central processing unit determines the traffic situation of each inflow path at the intersection based on the occupation rate or the traffic jam length which is vehicle detector information obtained by the own device, and when there is no traffic jam, The signal control constant calculation unit and the offset automatic calculation unit execute processing, and when a traffic jam occurs, the traffic time control constant selection unit executes processing, and the automatic offset calculation unit performs the signal control The cycle length calculated by the constant calculation unit and the split and the cycle length and split sent from the traffic signal control device provided at the upstream adjacent intersection are used to calculate and update the offset sequentially . an offset for calculating the cycle length and split during the cycle, the signal control constant calculation unit calculated based on the near future traffic demand Determined as the signal control parameters as time element indispensable offset sent during the previous cycle from the cycle length and the split and the automatic offset calculation unit to signal the control, the traffic jam control constant selection unit, the central processing The signal control parameter at the time of traffic jam that is most suitable for the traffic jam situation is selected from the signal control parameter patterns at the time of traffic jam stored in advance in the storage unit according to the traffic jam situation sent from the department, and determined by the signal control constant calculation unit A signal lamp provided at an intersection is controlled by a signal control parameter or a signal control parameter at the time of traffic selected by the control constant selection unit at the time of traffic .

The traffic signal control method according to the present invention creates and creates an inflow traffic flow table indicating the predicted number of inflows for a certain period of time before and after the current time based on the outflow traffic flow information from the adjacent intersection and the travel time from the adjacent intersection. Compare the inflow traffic flow table with the actual inflow traffic flow measured for a certain time before the current time, and the created inflow traffic flow table and the measured inflow traffic flow volume from small to large Pay attention to the rising change point and correct the arrival timing of the inflow traffic flow table and update it every predetermined time, and use the updated inflow traffic flow table to calculate the cycle length and split based on the near future traffic demand In the traffic signal control method for controlling the signal lamps provided at the intersection, the control device determines the traffic congestion status of each inflow path at the intersection according to the occupation rate or the traffic congestion length obtained from the vehicle detector information. When there is no congestion, the offset is calculated by the step of calculating the cycle length and the split, the cycle length calculated and the cycle length and split sent from the adjacent intersection on the upstream side. A step of sequentially updating the updated offset as an offset for calculating the cycle length and split at the next cycle at the intersection, the cycle length calculated based on the near future traffic demand, the split, and the offset automatic The process of determining the offset sent from the calculation unit during the previous cycle as a signal control parameter as a time factor that is indispensable for signal control, and when traffic congestion occurs, the traffic control parameter at the time of traffic jam stored in advance Traffic control during traffic jams that is optimal for traffic jam conditions A step of selecting parameters, characterized in that to function and controlling a signal lamp device provided on an intersection by traffic control parameters during congestion and signal control parameters or select the determined.

The present invention calculates the cycle length and split according to the traffic demand in the near future by the traffic signal control device provided at each intersection when there is no traffic jam, and calculates the calculated cycle length, split and upstream intersection. Calculate the offset from the cycle length and split calculated by the installed traffic signal control device and determine it as a signal control parameter. When traffic congestion occurs, the traffic signal control device provided at each intersection provides the optimal balance of traffic congestion Select traffic control parameters at the time of traffic congestion intended to be, and control the signal lamps provided at the intersection by the determined signal control parameters or traffic control parameters at the time of traffic congestion , so it is not dependent on the central controller It is possible to determine the optimal traffic signal parameters according to future traffic demand, and fully autonomous decentralized communication It is possible to realize a control device.

  FIG. 1 is a block diagram of the traffic signal control system of the present invention. As shown in the figure, in the traffic signal control system, a plurality of traffic signal control devices 1 provided at each intersection are connected via a transmission line 2.

  The traffic signal control device 1 controls a signal lamp provided at an intersection of roads, and as shown in the block diagram of FIG. 2, an information transmission unit 3, a central processing unit 4, a traffic flow measurement unit 5, and a storage unit 6, an inflow information creation unit 7, a signal control constant calculation unit 8, an offset automatic calculation unit 9, an outflow information creation unit 10, a traffic time control constant selection unit 11, and a signal control unit 12.

The information transmission unit 3 exchanges various information with the traffic signal control device 1 provided at the adjacent intersection via the transmission path 2. The central processing unit 4 controls various processes executed by the traffic signal control device 1. As shown in the road layout diagram in FIG. 3, the traffic flow measurement unit 5 sequentially inputs vehicle detection signals from the vehicle detectors 14 a to 14 h provided at each intersection 13 and flows into the intersection 13. The flow rate and the outflow traffic flow rate of the vehicle flowing out from the intersection 13 are measured. The storage unit 6 is a traffic control parameter (hereinafter referred to as a traffic jam) at the time of a traffic jam according to various information received by the information transmission unit 3, an inflow traffic flow rate or an outflow traffic flow rate measured by the traffic flow measurement unit 5, and a traffic jam condition A plurality of patterns of time control parameters) .

  The inflow information creation unit 7 determines whether the information transmission unit 3 receives the outflow traffic flow information from the adjacent intersection and the travel time from the adjacent intersection for a certain time from the current time 0 seconds, for example, 300 seconds before to 300 seconds later. The inflow traffic flow table showing the predicted inflow number in the prediction range up to the point where the traffic volume of the inflow traffic flow measured by the inflow traffic flow table and the traffic flow measurement unit 5 rises from small to large Paying attention, the arrival timing of the inflow traffic flow table is corrected and updated every fixed time, for example, every 10 seconds. The signal control constant calculation unit 8 uses the inflow traffic flow table created by the inflow information creation unit 7 to calculate the cycle length and split based on the near future traffic demand, and automatically calculates the calculated cycle length, split and offset. The signal control parameter is determined based on the offset calculated by the unit 9. The automatic offset calculation unit 9 calculates the offset based on the cycle length determined by the signal control constant calculation unit 8 and the cycle length and split sent from the traffic signal control device 1 provided at the split and upstream adjacent intersection 13 and sequentially. The updated offset is used as a basic offset for calculating the next signal control parameter.

  The outflow information creation unit 10 uses the outflow traffic flow measured by the traffic flow measurement unit 5, the inflow traffic flow table created by the inflow information creation unit 7, the branching rate, and the signal control parameter to keep the outflow traffic flow constant. The outflow traffic flow information is generated by predicting time, for example, every 10 seconds. The sequentially generated outflow traffic flow information is transmitted from the information transmission unit 3 to the traffic signal control device 1 at the adjacent intersection 13 via the transmission path 2. The traffic control parameter selection unit 11 is a traffic control parameter intended to optimize the traffic balance from the traffic control parameter patterns stored in the storage unit 6 when the inflow path of the intersection 13 is in a traffic situation. Select. The signal control unit 12 controls the signal lamps 15 a to 15 d provided at each intersection 13 by the signal control parameter calculated by the signal control constant calculation unit 8 and the traffic control parameter selected by the traffic control constant selection unit 11.

  The processing when the traffic signal control device 1 of this traffic signal control system controls the signal lamps 15a to 15d provided at each intersection 13 will be described.

  As shown in the flowchart of FIG. 4, the central processing unit 4 of each traffic signal control device 1 determines the traffic congestion status of each inflow path at the intersection 13 based on the occupation rate or the traffic congestion length which is sensor information obtained from the traffic flow measurement unit 5. Is determined (step 1), and when the vehicle is in a traffic state in which the vehicle can freely travel, an inflow traffic flow table creation process is performed (step S2). In the inflow traffic flow table creation process, as shown in the flowchart of FIG. 5, the information transmission unit 3 of each traffic signal control device 1 receives, for example, every 10 seconds from the traffic signal control device 1 provided at the adjacent intersection 13. The transmitted outflow traffic flow information is received and stored in the storage unit 6 (step S11). As shown in the schematic diagram of FIG. 6, the outflow traffic flow information 21 of the adjacent intersection 13 includes an actually measured occupation rate, an actually measured outflow number, and a predicted outflow number every 10 seconds, for example. In addition, the traffic flow measuring unit 5 inputs the sensing signals of the vehicle detectors 14 a to 14 d provided on the inflow side of each route of the intersection 13, measures the inflow traffic of each route, and sequentially stores it in the storage unit 6. Store (step S12). First, the inflow information creation unit 7 calculates the travel time T of each inflow path from the link distance and link speed between the own intersection 13 and the adjacent intersection 13 (step S13). This travel time T is a vehicle passing time from the installation position of the vehicle detector 14 that detects the outflow vehicle provided at the adjacent intersection 13 to the stop line of the own intersection 13, and the speed is determined between the intersections 13. If present, the average speed measured by the speed sensor is used. Further, when the speed sensor is not present and the occupancy rate and the traffic volume can be measured at the outflow point of the adjacent intersection 13, it is calculated from the occupancy rate, the traffic volume, and the average vehicle length. Thereafter, the inflow information creation unit 7 uses the schematic diagram of FIG. 7 based on the outflow traffic flow information 21 of the adjacent intersection 13 received by the information transmission unit 3 and the travel time T from the adjacent intersection 13 in each route calculated. As shown, the inflow traffic flow table 22 indicating the predicted inflow number of the prediction range from the current time 0 seconds to 300 seconds before and the current time 0 seconds to 300 seconds later is created and stored in the storage unit 6 (step S14). ). When the inflow traffic flow table 22 is created, the outflow traffic flow information received from the adjacent intersection 13 is shifted by the travel time T for each inflow route. The data between the current time 0 seconds and the travel time T of the route n uses the history of the actual number of outflows received from the adjacent intersection 13, and the latest data received from the adjacent intersection 13 until 300 seconds thereafter. Adopt outflow traffic flow information. Next, the inflow information creation unit 7 compares the created inflow traffic flow table 22 with the measured value 23 of the inflow traffic from the current time 0 seconds to 300 seconds before measured by the traffic flow measurement unit 5, The deviation of the arrival timing is corrected by paying attention to the changing point where the traffic volume of the created inflow traffic flow table 22 and the measured value 23 of the inflow traffic flow rises from small to large, that is, the timing when the head of the vehicle group arrives (step S15). . When the created inflow traffic flow table 22 is corrected, for example, as shown in FIG. 8A, the measured value 23 of the inflow traffic flow is actually measured as compared with the traffic change point A assumed in the inflow traffic flow table 22. When the traffic change point B is earlier by t seconds, the created inflow traffic flow table 22 is slid forward by t seconds and the travel time is corrected to (T−t). For example, as shown in FIG. 7B, when a traffic change point assumed in the inflow traffic flow table 22 occurs, a change point occurs in the actually measured traffic volume of the measured value 23 of the inflow traffic flow. If the vehicle group assumed in the inflow traffic flow table 22 has not arrived, the created inflow traffic flow table 22 is slid after a predetermined time, for example, 10 seconds, and the travel time is corrected to (T + 10 seconds). The creation of the inflow traffic flow table 22 and the correction of the arrival timing based on the actually measured values are updated every 10 seconds, for example. When the traffic volume is extremely small or when the saturated traffic flow continues, the change point of the arrival timing is not corrected because the change point of the traffic volume cannot be extracted.

  The central processing unit 4 uses the inflow traffic flow table 22 updated every 10 seconds to cause the signal control constant calculation unit 8 to perform processing for determining signal control parameters based on traffic demand in the near future (step S3). . When creating this signal control parameter, as shown in the flowchart of FIG. 9, the signal control constant calculation unit 8 first calculates the number of inflows 300 seconds after the current time 0 seconds in the inflow traffic flow table 22 of each route. In total, the expected degree of saturation is calculated (step S21). Here, when paying attention to one inflow path j at the intersection 13, the inflow path predicted saturation degree ρij is calculated as ρij = from the predicted cumulative traffic volume Qj and the saturated traffic flow rate Sj (set value) to flow in at the current number i. Calculated by (Qi / 300) / Sj, and the maximum value ρi = MAX (ρij) of the predicted inflow channel saturation ρij is set as the present predicted saturation. The sum ρ = Σρi of the displayed predicted saturation ρi is the intersection predicted saturation. The required cycle length Cn is calculated from this intersection predicted saturation ρ in units of 10 seconds as Cn = (1.5L + 5 + T) / (1−ρ) (step S22). Here, L is the loss time (set value), and T is the total value (set value) of the saturation calculation non-target steps. When the required cycle length Cn is calculated, if the intersection predicted saturation ρ is 1 or more, the required cycle length Cn is set to a preset upper limit value. The lower limit value of the necessary cycle length Cn is the sum of the minimum guaranteed seconds for each step. Next, as shown in FIG. 10, the signal control constant calculation unit 8 integrates the values of the inflow traffic flow table 22 of all inflow paths or specific inflow paths toward the future to calculate a demand accumulation value. Then, a point at which the accumulated demand value changes rapidly is determined, and the time between the two points is set as the planned cycle length C (step S23). By reflecting the change point of the accumulated demand value in the cycle length in this way, it is possible to synchronize with the adjacent intersection. Further, when the change point of the accumulated demand value cannot be detected, the necessary cycle length Cn is set as the planned cycle length C.

The signal control constant calculation unit 8 determines the i-present basic split Si = ρi / ρ based on the ratio of the calculated intersection saturation ρ and i-present predicted saturation ρi, and determines the number of seconds of each present-variable step. The number Ai is calculated by the following equation using the necessary cycle length C and the basic split Si shown (step 24).
Ai = (C−T−L) × Si−Bi
Here, Bi is the i fixed blue fixed step time.
The lower limit of the number of seconds Ai of each of the presently shown variable steps is (minimum guaranteed number of seconds + 1 second), the upper limit is (maximum monitoring time-1 second), and if the lower limit and the upper limit are violated, the lower limit The basic split Si is recalculated with the value or upper limit fixed. The determined basic split Si is finely adjusted in consideration of the arrival timing (step S25). As shown in FIG. 11, the stop time cost of each route can be calculated by the total sum ΣW of the number of staying units in each unit time for each of the present indications ψ1, ψ2, and ψ3. This staying number is the sum of the traffic volumes that have arrived after the previous blue display stop time, and the cost ΔW due to transmission delay is ΔW = (Wmax × 1...) Considering the propagation coefficient (5 m / s) of the transmission wave. 2) / 2 can be calculated. Here, Wmax is the staying number at the start of blue.
As shown in the following formula, the total delay time of each cycle having the respective indications ψ1, ψ2, and ψ3 is the sum of the total number ΣW of the staying number for each indication ψ1, ψ2, and ψ3 and the cost ΔW due to the transmission delay. Become.
Total delay time = (ΣW1 + ΔW1 + ΣW2 + ΔW2 + ΣW3 + ΔW3).
Therefore, for the preset variable split, the value of the variable step Ai is changed within the range of the maximum shortened seconds TS to the maximum extended seconds TE, and the total delay time of the next cycle is calculated for each case, and the total delay time is calculated. Is determined to be a variable step value.

  The central processing unit 4 stores the cycle length and split calculated by the signal control constant calculation unit 8 based on the near future traffic demand in the storage unit 6 and also from the information transmission unit 3 to the adjacent intersection 13 via the transmission path 2. It sends to the traffic signal control device 1 provided. Further, the central processing unit 4 stores the cycle length and split sent from the traffic signal control device 1 provided at the upstream adjacent intersection 13 in the storage unit 6. Then, the cycle length calculated based on the traffic demand in the near future by the signal control constant calculation unit 8 and the cycle length and split sent from the upstream adjacent intersection 13 stored in the storage unit 6 are used as the automatic offset calculation unit 9. To perform a feed offset calculation process. That is, the split calculated by the signal control constant calculation unit 8 and the split result sent from the upstream intersection 13 is an offset when focusing on the start point of the green signal in relation to the upstream intersection 13. This is an offset that minimizes the delay time based on the predicted traffic information. Therefore, the offset automatic calculation unit 9 calculates the offset from the cycle length calculated by the signal control constant calculation unit 8 and the cycle length and split sent from the adjacent adjacent intersection 13 on the upstream side, and the calculated offset is used as the next signal. This is sent to the signal control constant calculation unit 8 as a basic offset for calculating the control parameter. The offset automatic calculation unit 9 repeats this offset calculation process for each cycle to update the basic offset.

  The signal control constant calculation unit 8 determines the signal control parameter based on the cycle length calculated based on traffic demand in the near future, the split, and the offset sent from the offset automatic calculation unit 9 during the previous cycle. The central processing unit 4 sends the cycle length, split, and offset determined by the signal control constant calculation unit 8 to the signal control unit 12 to control the signal lamps 15a to 15d (step S4).

  When the signal control is thus performed to control the vehicle passing through the intersection 13, the central processing unit 4 causes the outflow information generation unit 10 to perform the outflow traffic flow information generation process (step S5). In this process of creating outflow traffic flow information, the traffic flow measurement unit 5 counts the detection signals output from the vehicle detectors 14e to 14h provided on the outflow side of the intersections 13 every predetermined time, for example, every 10 seconds. Measure outflow traffic flow. The outflow information creation unit 10 records the history of the number of outflows of each route measured by the traffic flow measurement unit 5 every predetermined time, for example, every 10 seconds, and the number of blue seconds displayed for each of the signal lamps 15a to 15d in increments of 10 seconds. Hold for 300 seconds, compare with the history data of the inflow traffic flow table, and calculate the branching rate for each display of each of the signal lamps 15a to 15d. Then, the inflow traffic flow table 22 is compared with the planned display, and the predicted outflow number per 10 seconds is calculated in units of 0.1 using the branching rate corresponding to the display, and the outflow traffic flow information 21 shown in FIG. 6 is obtained. create. Here, the reason for calculating the number of outflows in units of 0.1 is to fully reflect the calculation result of the predicted outflow number in the signal control. The information transmission unit 3 transmits the outflow traffic flow information 21 created by the outflow information creation unit 10 to the traffic signal control device 1 provided at the adjacent intersection 13 via the transmission path 2 (step S6).

  This inflow traffic flow table creation process, signal parameter calculation process, signal control, and outflow traffic flow information creation process and transmission process are sequentially repeated, and traffic signals created in time series for the traffic signal in the adjacent intersection 13 are provided. By mutually exchanging with the control device 1, it is possible to reliably respond to changes in traffic conditions with signal control, and to perform optimal traffic signal control according to traffic demand in the near future.

  Thus, the traffic signal controller 1 provided at each intersection 13 calculates the cycle length and split according to the near future traffic demand, and the traffic signal controller 1 provided at the calculated cycle length and split and upstream intersection 13. Since the offset is calculated from the cycle length and the split calculated in (5), it is possible to determine the optimum traffic signal parameter corresponding to the traffic demand in the near future without depending on the central control unit.

  In addition, when the central processing unit 4 determines the traffic congestion situation of each inflow path of the intersection 13 based on the occupation rate or the traffic congestion length which is the sensor information obtained from the traffic flow measurement unit 5, The control parameter selection unit 11 at the time of traffic congestion is made to perform control parameter selection processing at the time of traffic congestion (step S7). A traffic control parameter selection unit 11 is a traffic control parameter intended to optimize the traffic balance among the traffic control parameter patterns stored in the storage unit 6 according to the traffic situation sent from the central processing unit 4. Select. The central processing unit 4 sends the congestion control parameter selected by the congestion control constant selection unit 11 to the signal control unit 12 to control the signal lamps 15a to 15d (step S8).

  In this way, when the vehicle is in a traffic state in which the vehicle can freely travel, the signal lamps 15a to 15d are controlled by the signal control parameter determined by the signal control constant calculation unit 8, and when the traffic jam occurs, the traffic time control is performed. Since the traffic light control devices 15a to 15d are controlled by the control parameter at the time of congestion selected by the constant selection unit 11, the traffic signal control device 1 provided at each intersection 13 does not depend on the central management device and traffics the traffic light devices 15a to 15d. It can be optimally controlled according to demand.

  In the above description, the traffic signal control device 1 is provided with the inflow information creation unit 7, the signal control constant calculation unit 8, the automatic offset calculation unit 9, the outflow information creation unit 10, and the traffic time control constant selection unit 11. As shown in the block diagram of FIG. 12, programs for the inflow traffic flow table creation process, signal control parameter calculation process, and outflow traffic flow information creation process are stored in advance in an external storage medium 16 such as a magnetic disk or an optical disk. The processing program stored in the external storage medium 16 is read by the external storage medium I / F 17 of the traffic signal control device 1, stored in the storage unit 6, and using the processing program stored in the storage unit 6, the central processing unit In step 4, these processes may be executed.

It is a block diagram of the traffic signal control system of this invention. It is a block diagram which shows the structure of a traffic signal control apparatus. It is a block diagram of the intersection of a road. It is a flowchart which shows the control processing of a traffic signal control apparatus. It is a flowchart which shows the creation process of an inflow traffic flow table. It is a schematic diagram which shows the structure of outflow traffic flow information. It is a schematic diagram which shows the structure of an inflow traffic flow table. It is a schematic diagram which shows the correction process of the produced inflow traffic flow table. It is a flowchart which shows the calculation process of a signal control parameter. It is a change characteristic figure of accumulation demand for calculating a plan cycle length. It is a schematic diagram which shows the deviation correction of arrival timing. It is a block diagram which shows the structure of another traffic signal control apparatus.

Explanation of symbols

1; traffic signal control device, 2; transmission path, 3; information transmission unit, 4; central processing unit,
5; Traffic flow measurement unit, 6; Storage unit, 7; Inflow information creation unit, 8; Signal control constant calculation unit,
9; Automatic offset calculation unit, 10; Outflow information creation unit, 11; Control constant selection unit during traffic jam,
12; Signal control unit, 13; Intersection, 14; Vehicle detector, 15; Signal lamp,
21: Outflow traffic flow information, 22: Inflow traffic flow table.

Claims (2)

Based on the outflow traffic flow information from the adjacent intersection and the travel time from the adjacent intersection, create an inflow traffic flow table that shows the predicted inflow number for a certain time before and after the current time. Compare the inflow traffic flow actually measured before the time and pay attention to the change point where the traffic volume of the measured inflow traffic flow rises from small to large. A signal control constant calculation unit that corrects the arrival timing of the flow table and updates it every predetermined time, calculates a cycle length and a split based on traffic demand in the near future using the updated inflow traffic flow table, and road In the traffic signal control device for controlling the signal lamp provided at each intersection of
It has a central processing unit, an automatic offset calculation unit, and a control constant selection unit during traffic
The central processing unit determines the traffic situation of each inflow path at the intersection based on the occupancy rate or the traffic jam length which is vehicle sensor information obtained by the own device, and when no traffic jam occurs, the signal control constant calculation unit And the automatic offset calculation unit performs processing, and when a traffic jam occurs, the traffic time control constant selection unit performs processing,
The offset automatic calculation unit calculates the offset based on the cycle length calculated by the signal control constant calculation unit and the cycle length and split sent from the traffic signal control device provided at the adjacent intersection on the upstream side and updates sequentially. The updated offset is used as the offset for calculating the cycle length and split at the next cycle at the intersection .
The signal control constant calculation unit uses a cycle length calculated based on the traffic demand in the near future, a split, and an offset sent during the previous cycle from the offset automatic calculation unit as a time element indispensable for signal control. As a signal control parameter,
The traffic time control constant selection unit selects a signal control parameter at the time of traffic jam that is optimal for the traffic jam situation from among the signal control parameter patterns at the time of the traffic jam stored in advance in the storage unit according to the traffic jam situation sent from the central processing unit. Selected,
A traffic signal control apparatus for controlling a signal lamp provided at an intersection according to a signal control parameter determined by the signal control constant calculation unit or a signal control parameter at the time of traffic congestion selected by the traffic control constant selection unit. Based on the outflow traffic flow information from the adjacent intersection and the travel time from the adjacent intersection, create an inflow traffic flow table that shows the predicted inflow number for a certain time before and after the current time. Compare the inflow traffic flow actually measured before the time and pay attention to the change point where the traffic volume of the measured inflow traffic flow rises from small to large. The arrival timing of the flow table is corrected and updated every predetermined time, the cycle length and split are calculated based on the traffic demand in the near future using the updated inflow traffic flow table, and the signal lamp provided at the intersection is controlled. In the traffic signal control method,
The control device determines the traffic situation of each inflow path of the intersection based on the occupation rate or the traffic jam length obtained from the vehicle detector information,
When there is no traffic jam, calculating the cycle length and split,
The calculated cycle length and split and the cycle length and split sent from the adjacent intersection on the upstream side are used to calculate and update the offset sequentially, and the updated offset is used to calculate the cycle length and split for the next cycle at the intersection. An offset process;
Determining the cycle length and split calculated based on the traffic demand in the near future and the offset sent from the offset automatic calculation unit during the previous cycle as signal control parameters as time elements indispensable for signal control ; ,
When a traffic jam occurs , selecting a traffic control parameter at the time of traffic jam that is most suitable for the traffic jam situation from the traffic control parameter pattern at the time of traffic jam stored in advance;
Controlling the signal lamp provided at the intersection according to the determined signal control parameter or the traffic control parameter at the time of the selected traffic jam ;
The traffic signal control method characterized by making a function.

Images