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The elevator call control display system design

Author: ChenGuangLei
Tutor: WangBingFeng
School: University of Electronic Science and Technology
Course: Control Theory and Control Engineering
Keywords: μC / OS-II CAN bus Public information display system The elevator call control system
CLC: TN873
Type: Master's thesis
Year: 2010
Downloads: 77
Quote: 0
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Abstract


With China's sustained economic growth, the increase in the acceleration of urbanization, construction and real estate industry, the further development of urban rail transportation, airports, large shopping malls and other urban construction investment, the elevator market demand due to the various needs of rapid growth. The elevator call control system is an important part of the elevator system, which includes the public information display system as well as elevator call and control system. The early public multi-information display system using 8-bit, 16-bit processor, it is difficult to meet the demand of the system. To make up for this deficiency, we designed a 32-bit ARM7 processor and embedded μC / OS-II real-time operating system, public information display system. Traditional the elevator call control system using a relay contact is connected to the elevator master, not only throughout the disadvantage of high cost, poor reliability, high failure rate, but also bring a lot of inconvenience to the installation and commissioning. This paper presents the design of the the elevator call control system based on CAN bus is used to solve the above problems. This paper reads as follows: of μC / OS-II embedded operating system kernel, synchronous communication between the working mechanism of the kernel, task scheduling and management, tasks, time management, and interrupt management aspects of embedded real-time operating system to explore and study. ΜC / OS-II porting process the analysis the transplant process need to modify to three files OS_CPU.H OS_CPU_C.C, OS_CPU_C.ASM, and write a major porting code, and successfully transplanted into the LPC2138. The public information display system hardware design, power module, system hardware reset circuit module, RS485 communication module, big screen LED driver module design elaborate. Public information display system program developed on the basis of the real-time kernel μC / OS-II task μC / OS-II task allocation principle, and this principle task allocation, the communication between the task . Carried out a detailed description of each task module program. Study of the technical features of the CAN bus, CAN bus applications in the elevator call control system program. In addition AVR microcontroller features, on this basis, the completion of the the elevator call control system hardware design, a detailed description of each hardware module design. Detailed study of the structure and characteristics of CAN message, combined with the demand of the elevator control system, custom communication protocol of the the elevator call control system on this basis. According to the functional requirements of the the elevator call control system, to further the completion of the the elevator call control system software design.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display
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