Application of ARM core board in traffic signal
Psychology has a concept called "temporal perception", which means that people's perception of time is related to the content of activities, emotions, motivations, and attitudes. The most straightforward example: When you are anxious to wait for a result, you always feel that time is too slow. I was late for work and waited for the red light last Monday. I felt that the waiting time for red light was far more than usual! Talking to my colleagues, the concept of a "time perception" directly gave me a slap! In order to explore whether it is the cause of time perception, please do a brain supplement after work, the final conclusion: the red light time is longer than usual, really long! Learn about the traffic light control together. Traffic lights at intersections are controlled by traffic signals. Traffic signal control machines change the color of traffic lights at intersections, enabling vehicles and pedestrians that are in conflict with time and space to safely and efficiently pass through intersections. Reasonable control of the flow to achieve the purpose of channeling and improving traffic flow. Control methods include: 1, induction control The signal green time is changed in real time based on the detected traffic flow data. The phase runs at least the minimum green. If there is a car passing, it will extend an extended green time. If the car continues to arrive in the extended green time, it will continue to extend the green time until it reaches the maximum green. Through sensing, special functions such as phase dwelling and pedestrian crossing can be realized. 2, adaptive sensing control According to the condition of traffic flow, the signal control parameters are automatically adjusted in real time to adapt to the control mode of traffic flow change. 3, fixed cycle control The phase signal is output according to a preset control scheme. During the operation of the program, the period is long, the green signal ratio, and the phase sequence do not change with the change of road conditions. 4, multi-time control At different time intervals, the traffic status of the intersections is also different. In order to achieve better control effects, different control schemes should be set. The signal can be divided into several time periods by 24 hours a day, and each period runs a corresponding cycle and green letter ratio scheme. 5, ... If you don't want to say "I have something to ask about," I will see this, and it will be so beautiful when the traffic lights are separated and extinguished! The red light time is different in different time periods; even in the same time period, the traffic flow and the traffic flow are different in red light time. A traffic signal control cabinet that stands quietly at the intersection every day. The traffic signal is installed in the traffic signal control cabinet and is one of the important components of the modern urban transportation system. It is used for the control and management of urban road traffic signals. The traffic signal consists of a liquid crystal display, a control panel, a lamp group driving board, a button board, and a power supply. Control board design block diagram: The M3352 core board is based on Cortex-A8 processor, with a frequency of up to 800MHz. It adopts embedded Linux operating system (supports rich protocol stack and database), and supports users to realize the design of human-computer interaction interface through QT, which is convenient for later maintenance personnel to quickly locate through the interface. Signal light failure; Understand a few basic concepts of the signal machine: 1. What is the phase? What is the phase file? Phase is a collection of traffic lights that are simultaneously released during a signal period. For example, if the east-west direction is straight, the traffic light will be on for 40 seconds for one phase, and the north-south straight traffic direction will be light for 30 seconds for 1 phase. When the above phase is input to the signal controller, the signal converter converts the phase into data recognized by the control function, each phase corresponds to one set of data, and several phases correspond to several sets of data. Saving these phase data into one file is called a phase file. 2. What is the time slot? The traffic flow is different at different times of the day. If the phase release time of the whole day is set to a fixed time, the utilization rate of the entire road is very low. Therefore, this introduces a time period (also called timetable) as a means to control the phase release time. For example, during the peak hours of traffic, such as work and after work, the traffic volume is relatively large, and the phase time can be set to a relatively long time. 3. What is the difference between the green letter ratio and the maximum green time and minimum green time? The green signal ratio refers to the ratio of phase time to cycle time in a signal period; The maximum green time and the minimum green time are generally used above the intersection where the traffic flow is automatically controlled. In the intelligent intersection, the phase release time is automatically set according to the traffic flow of the road surface, that is, it may change every time; in order to avoid the automatically set phase release time is a very large value or very small Value, the set value must be limited to a range; the maximum green time and the minimum green time are used for this purpose. 4. What is the relationship between green conflict and green wave? The green light in the direction in which the two release conflicts is lit at the same time, which is called a green conflict. The green wave band and the green conflict are two completely different definitions. The principle of the "green wave belt" is to set the lighting time difference of the signal light according to the speed of the road vehicle and the distance between the intersections, so as to ensure that the vehicle starts from the first green light, as long as it travels according to the prescribed speed, and then encounters The signal lights will all be green.
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