文档介绍：Pressure Control of the High-mon-Rail Electronic Control System Based on HCS12
ABSTRACT
As general energy crisis e more and more serious and increasingly rigorous emission legislation, it is necessary for diesel to be developed with lower pollution, lower fuel consumption and high power per weigh. As a high flexible fuel injection system, the high mon rail (CR) injection system has e a trend of the diesel engines technology for its remarkable advantages. Research on hardware and software design of ECU for CR engines is an important issue in advancement and self-exploitation ability of inland motor industry.
According to the idea of hierarchical and modular design, the development of controlled software is divided into six functional modules, including initialization module, signal acquiring module, logic control module, driver module, munication module and monitor module. All above modules are independent, but interrelated to each other, and they can achieve the control objects of electronic control system together.
With the analysis of system’s structure and control principle, pressure control strategy research has been done. After that a study on the technologie of hardware and software for ECU development has been done.
The precise pressure control is the premises for many other parameters’s optimal control, at starting condition, it requests establishment of rail pressure speedly; after starting, it should adapt to the changes of working conditions, and maintain stability. In order to control pressure better, the MC9S12DP256B is adopted to meet the function requirements of ECU. The schematic diagram and PCB is designed. To every part, the schematic diagrams and the detailed introductions of the chips used in that part are given.
At last, the thesis introduces the system testing programme. The results showed that the control software and hardware were rational, and plished good control function.
Keywords: Diesel Engine, ECU, Pressure Control Strategy,HCS12