Research And Development Of Mechanical Stacker And Control System Of Automatic Parking

In recent years, with the development of our country and the rapid development of the auto industry, the quantity of the automobile in cities becomes larger and larger, while the embarrassing situation of the parking status in cities comes. The contradiction between the parking environment and the urban planning is becoming more and more prominent. The problem of parking is a static traffic problem arising in the process of urban development. Through improving the utilization rate of park space, and increasing the unit area parking density in parks, parking garage makes the number of parking provided by limited park space in cities greatly increased. Therefore, the automatic mechanical parking system has become one of the effective means to solve the difficulty of parking in cities.Through comparing with the existing nine categories Automatic Mechanical Parking System's characteristic on current market, the paper has obtained a set of more complete design project about Automatic Mechanical Parking System. This paper takes the car stacker as mechanical device. Garage control system uses the upper and lower computer collaborative model, and the upper unit state monitoring system based on the"Kingview"software development platform was established. Siemens S7-200 series PLC as the core of the lower computer controller responded for on-site hardware direct driving. Finally, this paper constructs the SQL database, and deposits and withdraws vehicles' related information to the upper computer control system to implement the dynamic management transfer.This paper details the research and development in the stacking parking control system, including the design principle and development process of the upper and lower machine control platform, the establishment of communication between upper machine and external database, and the building process of the communication relationship between upper machine and lower machine and so on. It has been established an human-machine interface of upper machine which included the function of access and searched the SQL database, and designed the LAD program of main moving parts which are controlled by corresponding lower machine(PLC). In addition, in view of the peak hours and off-peak hours of accessing cars, the corresponding mathematic model is constructed. It is solved by using theory of Probability and Mathematical Statistics and theory of Operations Research, obtained the optimization method of the system in scheduling strategy of accessing cars. At the same time, the stacker walking paths at peak hours have been arranged in reasonable order and reducing the total social waiting time as an optimization objective has been proposed. This idea has also been applied to the process control system designs.Using laboratory existing condition, the parking control system technology has carried on the simulation run. The results show that the system has the anticipated all control action, data storage and query functions. Moreover, the main function fulfilled the real-time and effectiveness requirements at the industrial control field. Also, it has a strong anti-interference and error correction capability. As well, the system runs stably.