JPH0320799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a traffic signal control device for efficiently controlling the traffic flow of automobiles.

Configuration of conventional example and its problems FIG. 1 shows a conventional traffic signal control device. In FIG. 1, 1 is a time setting circuit;
This time setting circuit 1 selects and outputs a predetermined control pattern depending on the day of the week and time. This control pattern signal corresponds to the signal light equipment's "blue, yellow,
This is the signal that determines the display time of "Red". 2 is a control circuit, and this control circuit 2 controls the blue display time, yellow display time, and red display time of the signal lamp device 4 according to the control pattern signal.

For example, if there is a lot of traffic at a predetermined time on weekdays, the control pattern is set in the time setting circuit 1 so that the blue display time becomes longer.

However, in the above conventional example, the traffic flow is often not the same even on the same day of the week and at the same time due to special circumstances such as weather, traffic accident handling, road construction, festivals, etc. The control pattern also caused traffic congestion, which was a problem.

Purpose of the Invention The present invention is intended to eliminate the above-mentioned conventional problems, and to change control pattern signals only during times when there is a large difference in traffic flow, even on the same day of the week and at the same time, to fine-grained traffic flow. It is an attempt to control the

Structure of the Invention In order to achieve the above object, the present invention detects the noise of automobiles during times when there is a large difference in traffic flow, selects a predetermined control pattern according to the noise level, and controls the signal lamps. It controls the

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a traffic signal control device in one embodiment of the present invention. Figure 3 A-C
is a diagram of output signals generated in the same embodiment.

In FIGS. 2 and 3, 5 is a noise detection circuit having a microphone, and this noise detection circuit 5
is installed near a signal lamp 4 at an intersection, etc., and detects the noise generated by cars passing on the road, converts it into an electric signal, and outputs it. 6 is a first time setting circuit, and this first time setting circuit 6 selects and outputs a control pattern signal according to the size of the register of the noise detection circuit 5 from among a plurality of control pattern signals. It is something to do. In addition, each control pattern signal sets the display time of each color of the signal lamp device 4. 8 is a timer circuit, and this timer circuit 8 continuously sends out signals indicating the current day of the week and time. Reference numeral 9 denotes a second time setting circuit, which receives the day of the week and time signals and sets the general time period T ₁ to _{T 2} as shown in FIG. 3B.
During times _T3 to _T4 , a second control pattern signal 10a corresponding to the day of the week and time is sent out. Also, during the predetermined time period _T2 to _T3 , the switching signal 10b is sent out to switch the switching circuit 11 to the first time setting circuit 6 side and control the output of the second time setting circuit 6. It is output to the circuit 13.

In this way, in this embodiment, as shown in FIG. 3C,
The second control pattern signal 10a of the second time setting circuit 9 is sent during the general time periods _{T1 to} T2 and _T3 to _T4 , and the second control pattern signal 10a of _the second time setting circuit ₉ is The first control pattern signal 7 of the first time setting circuit is sent out.

In this way, the first control pattern signal 7 and the second
A switching circuit 11 including a control pattern signal 10a of
The output signal 12 becomes an input to the control circuit 3, and the control circuit 3 controls the lighting and extinguishing of the signal lamp device 4.

In this embodiment, the noise detection circuit 5 and the first time setting circuit 6 are constantly operated, but the switching signal 10
If the noise detection circuit 5 and the first time setting circuit 6 are operated only when the switching circuit 11 receives the signal b, energy can be saved.

Effects of the Invention The present invention has the above configuration, and according to the present invention, the display of the signal lamp is controlled by a predetermined control pattern signal during times when the traffic volume is constant depending on the day of the week and the time, During periods of uncertain traffic volume, the display of the signal lamps is controlled according to the level of noise generated by automobiles, making it possible to precisely and efficiently control traffic flow.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional traffic signal control device, Fig. 2 is a block diagram of a traffic signal control device according to an embodiment of the present invention, and Figs. 3A to 3C are diagrams of output signals generated by the same embodiment. be. 3... Control circuit, 4... Signal lamp device, 5... Noise detection circuit, 6... First time setting circuit, 7... First control pattern signal, 8... Timer circuit, 9... Second time setting circuit, 10a... Second control pattern signal, 1
0b...Switching signal, 11...Switching circuit, 12...Output signal, _T1 , _T2 , _T3 , _T4 ...Time.

Claims (1)

[Claims] 1. Noise detection circuit 5 and first time setting circuit 6
, a second time setting circuit 9, a switching circuit 11,
The noise detection circuit 5 detects the level of noise generated by cars passing on the road, and the first time setting circuit 6 stores a plurality of control patterns. The second time setting circuit 9 stores a plurality of control patterns and outputs a first control pattern signal 7 selected according to the output signal level of the noise detection circuit 5. , a second control pattern 1 selected according to a time period determined according to the time of day.
0a and a switching signal 10b, the switching circuit 11 switches from the second control pattern 10a to the first control pattern signal 7 according to the switching signal 10b, and outputs the first control pattern signal 7. The control circuit 3: A traffic signal control device that inputs the output signal of the switching circuit 11 and drives the display of the signal lamp device 4.