| This paper introduces a kind of fuel and gas boiler intelligent control system. It includes computer-based upper control system and microcomputer-based lower control system. Upper control system is responsible for the united control of many boilers, sending control command to lower control system, accepting collecting data from lower control system, displaying real-time or history working state for user. Lower control system is responsible for automated control of single boiler.This boiler control system applies to hot water mode and heating mode. In hot water mode, this paper innovate a new control plan named self-adapting, which alter boiler water temperature setting according to the change of user temperature. It can greatly improve work efficiency, save energy. As for heating mode, this paper presents a new method which alter boiler water temperature setting based on environment temperature, while changing water flux in different temperature level.Upper control system is developed in Windows environment using Visual C++ and ACCESS database. It communicates lower control system through RS-485 twisted-pair with exclusive communication protocol.Lower control system applies not only to general burner and pump but also to continuous adjusting equipment. It uses different control plan according to different periphery equipment, so it can give users greater selecting space.Lower control system uses MCS-51 microcomputer as main control chip, it also includes interface circuit, such as sensor, A/D, D/A, LCD, real-time clock, watchdog and serial E2PROM. This paper presents hardware circuit and some important software source code.
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