SU1285512A1 - Method and apparatus for determining traffic delays at controlled cross-roads - Google Patents

Abstract

The invention relates to traffic control systems and can be used to improve the efficiency of traffic control at a regulated intersection. The aim of the invention is to improve the accuracy of determining transport delays. According to the method, vehicles (TS) entering the controlled area (CC) are recorded using detector 5, the current length of the vehicle's queue is determined. Short circuit by summing in the counter 3 vehicles that occur in a fault with a delay equal to the travel time of the fault vehicle and reducing the amount received by one at a traffic light at intervals of unloading queues generated by the generator 8. Thanks to this, the vehicle that entered the fault with a permit traffic light signal will be added to the current queue length and immediately deducted from it at the moment of departure from the short circuit. If the vehicle does not have time to leave the short-circuit at the permissive signal of the traffic light, then it will be added to the current queue length. By the end of the measurement period in the accumulating adder b, the total transport delay is obtained by every second summing up the current queue length. The signal from the output of the one-shot 1 at the end of the measurement period using block 7 determines the average transport delay by dividing the total transport delay by the number of vehicles entering the fault during the measurement period. At the same time, the counters 3 and 4 and the adder 6 are reset to the zero state. 2 sec. f-ly, 1 ill. i th 00 SP Sd w4 INS

Description

The invention relates to traffic control systems and can be used to improve the efficiency of vehicle traffic control at a regulated intersection.

The purpose of the invention is to improve the accuracy of determining transport delays by taking into account the vehicles in the controlled area (CZ) at the moment when the determination of transport delays begins.

The drawing shows a block diagram of a device for determining transport delays at an adjustable intersection.

The device contains a one-shot 1, a delay element 2, a reversible counter 3, a counter 4, a Transport Detector (DT) 5, an adder 6, a dividing unit 7, a pulse generator 8 and an And 9 element

A single vibrator 1 is designed to form a pulse at the moment of switching on the inhibitory signal of a swaphophore, the duration of which is equal to the measurement period of transport delays. Delay element 2 and reversible counter 3 are designed to determine the current length of the vehicle queue, Counter 4 calculates the total number of vehicles that were entered into the fault by DT 5, CyMi iaTop b is used to determine the total transport delay. In division 7, the calculation is made average transient delay.

According to this method, the average transport backoff is determined by dividing the total transport delay by the number of vehicles, in the cavities in the fault during the measurement period. The total transport delay, L, in turn, is determined periodically with the period At by summing the current length of the vehicle line to the short circuit and is equal to

 SHI; where If is the current queue length of the vehicle in

KZ; ,

k is a positive integer equal to

where T is the period for determining the transport delay.

The determination of the current length of the vehicle queue in a fault is carried out by summing the vehicle entering the fault with a delay equal to the trip time of the fault vehicle and reducing the amount received by one for

permissive traffic signal at time intervals u, tp unloading. Atp corresponds to the average time interval between the vehicle at the intersection or the stop line during the unloading of the vehicle queue at the permissive traffic light signal. Due to this, the vehicle entering the short circuit at the permissive traffic signal is added to the current queue length and immediately read Short circuit, If a vehicle that entered the short circuit with a permissive signal, Tofora, does not have time to leave the short circuit until the end of its operation, then it is added to the current length of the vehicle queue.

The device works as follows.

By the leading edge of the prohibitive signal pulse, the one-shot 1 is brought to a temporarily stable state. The signal from its direct signal permits the passage of a pulse from the output of the DT 5 through the element AND 9 to the input of the delay element 2 and to the addition input of the counter 4. The content of the latter is continuously fed to one of the information 1 outputs of the division 7. A code corresponding to the number of pulses, counted with a delay in the counter 3, is fed to the input of the summation of the adder 6, where periodically, for example every second, it is added to the contents of the adder 6. The code from the output of the last is constantly fed to another information input of the dividing unit 7. .one ,

The pulses from the output of the generator 8. are fed to the input of the subtraction of the counter 3. The operation of the generator 8 is prohibited during the action at its first input of the signal corresponding to the prohibitory signal of the traffic light, i.e. at the time when the vehicle can not leave the short circuit. However, the current value of the vehicle queue is not reduced. In addition, the operation of generator 8 is prohibited by the signal from the second output of counter 3 for as long as the content of counter 3 is zero.

After the determination of the transport delays, the single generator 1 goes into a steady state. In this case, the passage of 1-pulses through the element And 9 is prohibited. The signal from the ip version of the one-shot 1 allows the calculation in block 7 of dividing the average transport delay and the arrival of the corresponding code by

device output. With the same signal, the counters 3 and 4 and the adder 6 are reset to the zero state. Thus, the device is ready for a new cycle.

work.

Claims (2)

1. The method of determining transport delays at an adjustable intersection, based on fixing vehicles entering the controlled area located in front of the stop line of the adjustable intersection, determining the current queue length of transport vehicles in the controlled area, determining the total number of vehicles entering the controlled area for the period of measurement, determining the total for the period of measurement of the transport delay by periodic summing with the time interval & t The queue of vehicles in the controlled area, determining in) the end of each period of measuring the average transport delay by dividing the total. transport delay for the total number of vehicles entering the controlled area during the measurement period, characterized in that, in order to improve the accuracy of determining transport delays by taking into account vehicles that were in the controlled area at the time the transport delays began to be determined vehicles in the controlled area are determined by summing the vehicles entering the controlled area with a delay equal to the travel time Tvam controlled area, and five W 15 0 5 0 5 0 reducing the amount received by one at the permissive signal of the traffic light at intervals Atp of unloading the queue, equal to the average period of departure of vehicles from the controlled area after the permissive signal of the traffic light is turned on. I 2. A device for determining transport delays at an adjustable intersection, containing a reversible counter, a transport detector, a counter, a pulse generator, the first output of a reversible counter, is connected to the information input of the accumulator, in order to increase the accuracy of the device, An I element, a single vibrator, a delay element and a dividing unit are inputted to it, the output of the transport detector is connected to the first input of the I element, the one-shot input is combined with the first input of the pulse generator and is the input of device, the direct output of the one-shot is connected to the second input of the element I, the output of which is connected to the input of the delay element and the information input of the counter, the output of which is connected to the first information input of the division unit whose output is the output of the device; the inverse output of the single-vibration is connected to the reverse inputs of the reverse the counter, the counter and the adder and the control input of the dividing unit, the output of the szgmmator is connected to the second information input of the dividing unit, the output of the delay element is connected to the input of the addition A counter counter, the output of the pulse generator is connected to the subtracting input of a reversible counter, the second output of which is connected to the second input of the pulse generator.