电控单体泵系统及实时控制软件研究
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摘要
电控高压燃油直接喷射技术是柴油机提高柴油机动力性、实现低污染、低油耗的最有效手段之一,为满足愈加严格的排放法规要求和高速重载车辆功率提升的应用需求,开发各种形式的电控高压燃油喷射系统及提升其性能已成为柴油机应用研究领域的重点。本文结合厂校合作重大攻关项目——电控单体泵柴油机的研制与开发,对电控单体泵系统及其实时控制软件进行了研究。内容主要包括:
     1.建立单体泵燃油喷射系统的仿真分析模型,着重对电控单体泵燃油喷射系统的喷射特性进行了仿真分析,分析了喷射压力、喷油速率、喷射延迟等参数随运行工况变化的特性,并分析了柱塞/喷孔直径直径比、长度比等结构参数对燃油喷射系统喷油特性的影响。
     2.对电控单体泵燃油喷射系统的喷射特性进行了试验研究,对喷射过程中影响延迟的运行因素进行了试验研究和分析。并且在试验的基础上对喷油延迟特性进行了方差分析,用统计方法分析了不同的运行参数对燃油喷射系统喷射延迟的影响程度,以此实现喷射延迟脉谱和油量线性化脉谱的优化标定。
     3.引入并采用了先进的系统开发平台、开发工具和开发流程。在软件的设计过程中贯彻了可靠性设计的原则和实时多任务的思想,对实时控制软件进行了多任务模块化设计、系统失效恢复设计、抗干扰设计、冗余设计。并对实时控制软件进行了测试。
     4.在自主研发的硬件在环仿真平台上进行了实时控制软件的测试,利用代码自动生成软件(TargetLink)对控制算法模型进行了模型在环仿真、软件在环仿真测试以考察代码的生成精度,以电控柴油机控制系统的应用开发为背景,利用TargetLink自动代码生成工具,实现了模型程序代码至控制系统标准C代码的生成。
     5.对整个控制系统进行了柴油机的实机应用试验,完成了整个ECU电控系统、单体泵系统、柴油机系统的集成和匹配试验。
Electronic control high pressure fuel direct injection is one of the most effective methods to achieve the improvement of power, low emission and fuel economic. In order to meet the stricter emission regulation and higher power requirement of high speed heavy duty vehicle, the diesel engine application have put emphasis on development of various kinds of electronic control high pressure fuel injection system. Combined with the key cooperation project of OEM and college—development of EUP diesel engine, the EUP and real time software has been researched. The major content of the paper include:
     1. Simulation analysis model of EUP fuel injection system is established. The fuel injection characteristics such as injection pressure, injection rate, injection delay time under different operation conditions of EUP are analyzed. The effects of parameters such as plunger/hole diameter ratio, length ratio on fuel injection characteristics are also analyzed.
     2. The experimental research on fuel injection characteristics of EUP system is performed. The operation factors that may affect the fuel injection delay is tested and analyzed. The variance analysis on fuel injection delay characteristics is performed on the experimental basis. And the statistical method is applied to analyze the operation parameter’s affecting strength on injection delay time of the system. Thus the optimized calibration on fuel injection delay map and fuel linearization map is achieved.
     3. Advanced platforms and developing tools as well as developing process have been adopted. With the principle of reliable design and real time multi-task method, multi-task modularizations design, safe-fail design, anti-interference design, redundancy design method is adopted in the designing of real time control software. And the test on real time control software is performed.
     4. Real time control software test is performed on the self-developed Hardware-in-loop bench. Simulation of Model-in-loop and Software-in-loop were performed so as to study the precision of auto-generated codes. And auto-generated codes were downloaded into the hardware by auto-code generator Targetlink. And the transformation from model code to standards C code is successfully achieved.
     5. The whole coltrol system is tested by the diesel engine experiments. And the overall integrated and matched experiment of the ECU、EUP and diesel engine is successfully reached.
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