文档介绍：中北大学学位论文
中北大学学位论文
基于 HCS12 的高压共轨柴油机轨压控制策略的研究
摘要
随着常规能源的日益枯竭和排放法规日益严格,迫使柴油机朝着低污染、
低油耗和高功率的方向发展,高压共轨燃油喷射系统作为一种高柔度的燃油喷射
系统,以其显著的优越性,已成为现代车用柴油机技术发展的趋势之一。研究关
键的电控喷射系统软硬件设计技术,对于我国汽车行业的技术进步和自主研发能
力,具有非常重大的现实意义。
本文通过对高压共轨系统结构和控制原理的分析,进行了轨压控制策略的
研究研究工作,并基于控制策略对 ECU 开发所涉及的硬件和软件进行了初步研
究。
共轨压力的精确控制是众多空置量优化控制的一个前提,起动时要求迅速
建立轨压,起动后要适应工况的变化,保持轨压稳定。针对电控单元的功能要求,
完成了以 MC9S12DP258B 微控制器为核心的硬件电路原理图和 PCB 设计,分析
了各部分原理图的组成及其所涉及的芯片的特性。
根据分层设计和模块化思想,进行了电控系统的软件开发,主要针对包括
初始化模块、信号采集模块、逻辑控制模块、驱动控制模块、串行通信模块以及
监控模块在内的六大功能模块进行了开发。完成了各模块在电控系统中即相对独
立又相互联系的关系,能够实现电控系统的控制任务。
最后对整个电控单元的实验测试方案进行了说明。实验证明,系统的硬件
能够在试验台架上可靠的运行,软件系统也能达到预期的功能,整个系统控制功
能良好。
关键词:柴油机,电控单元,轨压控制策略,HCS12
中北大学学位论文
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, serial
communication 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 th