Speed Disturbance in the Diesel Engine Electronic Control System

In order to sample the speed signal of electronic diesel engine in real time and make the engine work reliable, the diesel engine control system's speed acquisition was studied and the problem of speed disturbance was solved. The control system was based on the 8?bit electronic control unit(ECU) system and the assembly language was used to design the software for controlling the engine fuel quantity and the turbocharger of the variable geometry turbine for the heavy duty diesel engine. By changing the timing method for speed acquisition, the problem of speed disturbance was solved and the reliability of the ECU was improved.

Electronically Controlling the System of Preheating Intake Air by Flame for Diesel Engine Cold-Start

In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about the partial working processes of the diesel engine, the amount of heat energy, enough to make the fuel self ignite at the end of compression process at different temperatures of coolant and intake air, was calculated. Several HY20 preheating plugs were used to heat up the intake air. Meanwhile, an electronic control system based on 8 bit micro controller unit (MCS 8031) was designed to automatically control the process of heating intake air. According to the various temperatures of coolant and ambient air, one plug or two plugs can automatically be selected to heat intake air. The demo experiment validated that the total system could operate successfully and achieve the scheduled function.

Hardware-in-the-Loop Research on the Electronic Control Unit for Diesel Engines

A hardware-in-the-loop simulating platform is developed to avoid designing defects caused by the complicated logical structure and multiple-functional buildup of the dectronic control unit（ECU）in modem diesel engines, and to diminish potential damages on components or human exposure to dangers in R＆D en- deavor. This plat-form consists of a computer installed with software Matlab/Simulink/RTW and dSPACE/ ControlDesk; a diesel engine ECU, and a dSPACE autobox which runs a real-time diesel engine model. A typical model of diesel engine with turbocharger and intercooler is presented. Based on this model our research is carried out with a real ECU to test its software control strategies. Results show that by using the diesel engine model downloaded inside, the hardware-in-the-loop platform can simulate diesel engine＇s working conditions and generate all kinds of sensor signals which ECU needs on a real-time basis. So the ECU control strategies can be validated and relevant parameters roughly calibrated.

APPLICATION OF CIRCUIT SIMULATION IN HARDWARE DESIGN FOR ELECTRONIC CONTROL HIGH PRESSURE COMMON-RAIL FUEL SYSTEM OF DIESEL ENGINE

By means of circuit simulation, hardware of electronic control unit （ECU） of high pressure common-rail electronic control fuel system for diesel engine is designed. According to the system requirements for hardware of ECU, signal-processing circuit of variable reluctance （VR） sensor, filter circuit for input signal, high voltage power circuit and driver and protection circuit of solenoid are simulated as emphases. Difficulties of wide scope of VR sensor output signal, efficiency of high voltage power and reliable and swift driver of solenoid are solved. The results of simulation show that the hardware meets the requirement of the fuel system. At the same time, circuit simulation can greatly increase quality of the design, alleviate design labor and shorten design time.

Electronic Unit Pump Diesel Engine Control Unit Design for Integrated Powertrain System

The performance of the electronic unit pump (EUP) diesel engine is studied, it will be used in the integrated powertrain and its multi parameters are controllable. Both the theoretical analysis and experiment research are taken. A control unit for the fuel quantity and timing in crankshaft domain is designed on this basis and the engine experiment test has been done. For the constant speed camshaft driving EUP system, the fuel quantity will increase as the supply angle goes up and injection timing has no effect. The control precision can reach 1°CA. The full injection timing MAP and engine peak performance curves are made successfully.

Study of Diesel Engine Management System

Aim To study the diesel engine management spstem (DEMS). The DEMS can consider many engine parameters and so it can acquire the optimum system performance. Methods On the basis of analyzing the characteristics of diesel engine electronic system, the real-time, multi-tasks system design methods were used for the heavy duty vehicular diesel engine electronic control system . The hardware and software of DEMS were developed. Results and Conalusion By the test on dieSel engine bed, the system was verified and the foundation of the fully developed DEMS was laid.

STRATEGY FOR DIESEL ROTARY ENGINE WITH COMMON RAIL INJECTION SYSTEM

A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development focuses on the applied fuel injection and ignition strategies, especially concerning the combustion configurations of injectors, ignition source, and combustion chamber. The prototype engine, equipped with Bosch common rail system and high performance electronic control unit （ECU）, is designed correspondingly. Studies show that the integration of a common rail injection system and the main and pilot duel injectors configurations, assisted with glow plug ignition device and flexible ECU, represents a promising approach to improve the potential of the low compression ratios diesel rotary engine. Currently the engine can run at 6 kr · min^-1 steadily and the power is about 68 kW/（4 kr ·min^- 1）.

SIMULATION IN THERMAL DESIGN FOR ELECTRONIC CONTROL UNIT OF ELECTRONIC UNIT PUMP

The high working junction temperature of power component is the most common reason of its failure. So the thermal design is of vital importance in electronic control unit （ECU） design. By means of circuit simulation, the thermal design of ECU for electronic unit pump （EUP） fuel system is applied. The power dissipation model of each power component in the ECU is created and simulated. According to the analyses of simulation results, the factors which affect the power dissipation of components are analyzed. Then the ways for reducing the power dissipation of power components are carried out. The power dissipation of power components at different engine state is calculated and analyzed. The maximal power dissipation of each power component in all possible engine state is also carried out based on these simulations. A cooling system is designed based on these studies. The tests show that the maximum total power dissipation of ECU drops from 43.2 W to 33.84 W after these simulations and optimizations. These applications of simulations in thermal design of ECU can greatly increase the quality of the design, save the design cost and shorten design time

防爆柴油机排气颗粒物的微观结构研究

为研究废气水洗箱和含氧燃料对防爆柴油机排气颗粒物微观结构随工况变化的影响,利用扫描电子显微镜(Scananing Elecron Microscope,SEM)对0#柴油(D100)和丁醇/柴油混合燃料(BD20)的排气颗粒物的微观形貌、分形特征和粒径分布进行研究。其中,丁醇的质量分数为20%。结果显示:经过废气水洗箱后,颗粒物内吸附质含量增多,密集程度升高,在多数工况下,颗粒物支链减少,且BD20有利于减少颗粒物碳烟粒子含量;颗粒物的计盒维数分布在1.70~1.85,且经过废气水洗箱的颗粒物结构更紧密,计盒维数更大,D100的计盒维数大于BD20的计盒维数;颗粒物基础碳粒子粒径分布在10~90 nm,废气水洗箱对颗粒物有沉降作用,使颗粒物平均粒径减小,BD20的平均粒径小于D100平均粒径。

智慧矿山系统工程及关键技术研究与实践

针对智慧矿山复杂巨系统建设过程中存在的问题,提出了智慧矿山建设的总体技术架构,并分别从智慧矿山系统模型构建、地下空间重构与模型动态更新、机器视觉测量技术、瓦斯环境射频防爆测试方法、矿山安全闭环管控体系、智慧矿山标准体系等方面进行了详细阐述。将智慧矿山分为信息感知支撑层、边缘计算层、云数据中心、多型网络、矿山智能生产管控平台、矿山智能生产系统、智慧矿山运维管理系统,构建了基于多系统深度融合的智慧矿山技术架构。基于智慧矿山知识图谱及信息抽取技术,构建了以数据创新为驱动、通信网络为基础、数据算力为核心的智慧矿山系统模型。构建了以机器视觉感知信息为主、其他感知信息为辅的矿山井下三维视觉空间模型,提出了矿山井下场景三维视觉与空间重建框架,实现了矿山井下三维空间重构与动态更新。开发了基于机器视觉技术的井下设备位姿与煤岩界面识别算法,实现了对井下综采装备群及煤岩分界面的同时空测量。探讨了井下瓦斯环境下现行防爆标准对5G基站功率的限制及存在的不足,设计开发了射频电磁能防爆专用试验装置,为提升井下5G基站功率阈值提供了方法借鉴。提出了融合灾害信息全面感知、防控方案自主决策、防控装备协同控制的矿井灾害闭环管控系统技术架构,实现井下灾害的超前预测预警与协同防控。构建了智能化煤矿标准体系框架,剖析了我国煤矿与金属矿山智能化建设典型案例,提出了智慧矿山建设发展趋势及建议。

矿用防爆柴油机四元组合式尾气后处理系统设计及性能试验

防爆柴油机是矿井辅助运输车辆使用最为广泛的动力源之一,受防爆改造以及井下恶劣环境的影响,导致其尾气污染问题严重,有悖于绿色矿山发展战略。煤矿井下自2020年12月开始实施非道路国III排放标准,但现阶段矿用防爆柴油机尾气净化多采用机内前处理技术,无法满足非道路国IV及更高标准的排放要求。针对防爆柴油机尾气污染严重及净化技术滞后的问题,设计了一种新型四元组合式尾气后处理系统,并通过仿真和台架试验开展了关键部件结构参数优化及尾气污染物净化性能研究。首先,按照煤矿井下防爆要求,超前面向非道路国IV尾气排放标准,设计了一种由氧化催化剂(DOC)、颗粒捕集器(DPF)、选择性催化还原器(SCR)和防爆温控装置(EPTC)组成的防爆柴油机四元组合式尾气后处理系统;采用STAR-CCM+仿真软件对防爆温控装置结构进行传热分析,结果表明:管壁面温度均小于150℃,可满足煤矿安全规程防爆要求。其次,以某型60 kW防爆柴油机为研究对象,基于GT-Power软件分别搭建了DOC、SCR和DPF后处理部件的仿真模型,并对其关键结构参数及净化性能开展正交试验进行优化,确定了尾气后处理系统关键部件的最优结构参数,得到如下规律:污染物的净化效率随DOC和SCR的载体直径、载体长度和通道密度的增大而提高;载体长度和载体直径对DPF捕集效率与DOC和SCR规律一致,而DPF因其特殊的壁流式载体结构,随着通道密度增加,PM颗粒物的捕集效率可始终维持在96%附近。在此基础上,建立了防爆柴油机和后处理系统的耦合模型,开展了防爆柴油机尾气排放污染物净化效率、动力性与经济性仿真试验。最后,研制了四元组合式尾气后处理系统样机并开展台架试验,将试验数据与仿真数据对比分析,结果表明:尾气后处理系统对CO、NO、HC与颗粒物的净化效率分别大于95%、90%、83%以及95%,可满足非道路国IV排放要求;加装尾气后处理系统的防爆柴油机整体输出扭矩平均下降4.83%,整体燃油消耗率平均增加1.19%,对防爆柴油机的动力性与经济性的实际影响较小。

双升程电控喷油器多次喷射油量波动特性研究

为实现船用柴油机高压共轨系统喷射的柔性和稳定控制,提出一种双升程电控喷油器,基于搭建的喷油器AMESim仿真模型,探究了喷油器不同多次喷射模式下的油量波动特性.结果表明:大升程预喷模式下的主喷量标准差随预喷量的增加先上升后下降,而小升程预喷模式下的主喷量标准差随预喷量呈幅值逐渐降低的波动变化趋势.总体上,在预喷量为161~660 mm^(3)范围,小升程预喷模式在降低主喷量波动程度方面比大升程预喷模式更占优势.预喷射采用小升程喷射模式且预喷量一定时,升程切换延迟为0.2 ms的靴形主喷模式在降低主喷量波动程度方面略优于相同主喷脉宽或相同单次喷射油量的大升程主喷模式.大升程和小升程后喷模式下的后喷量标准差随主喷脉宽和目标后喷量均呈波动变化趋势,且小升程后喷模式下的后喷量标准差波动程度更小.与大升程后喷模式相比,小升程后喷模式在降低后喷量波动程度方面更占优势.

防爆柴油机机油保护液压启动系统设计

防爆柴油机是煤矿辅助运输装备的主要动力源之一,安全保护与启动系统是防爆柴油机必备系统,小型辅助运输装备的高度集成化给防爆柴油机提出了新要求。通过对无轨胶轮车防爆柴油机保护及启动系统进行研究,设计了一种基于机油保护、液压马达启动的防爆柴油机机油保护液压启动系统。通过采用机油保护液压启动,综合运用装备本身自带资源,实现防爆柴油机的正常启动与保护,满足小型低矮紧凑装备在性能及空间布置的需求,提高装备的功能性、经济性、可靠性,提升装备的应用价值。

柴油机电控系统分析与研究

概述柴油机电控技术的发展历程,阐述柴油机电控系统的功能与特点,分析柴油机电控系统的工作原理与控制功能,并对柴油机电控单元、传感器及执行器3个柴油机电控系统的主要组成要素进行研究。

基于模糊PID的非道路国三排放防爆柴油机喷油量闭环控制方法

常规非道路国三排放防爆柴油机喷油量闭环控制方法主要采用动态跟踪实现喷油量的控制,忽略了不确定性因素的影响,导致控制结果的空燃比与理想数值偏差较大,对此,提出基于模糊PID的非道路国三排放防爆柴油机喷油量闭环控制方法。首先,根据平均有效压力参数建立非道路国三排放防爆柴油机喷油系统模型;然后,在该模型中添加PID控制器,并在PID控制的基础上,结合模糊逻辑处理采样值的不确定性,设计模糊PID下的喷油量控制框架;最后,利用模糊PID的反馈参数作为控制信号对非道路国三排放防爆柴油机的喷油量进行闭环控制。实验分析可知,在此方法控制下的柴油机空燃比结果与理想空燃比数值更为接近,最大偏差仅为1.96,满足非道路国三排放防爆柴油机的实际应用需求。

CH_(4)浓度对于矿用防爆柴油机排放性能的影响研究

为了研究CH_(4)浓度对于矿用防爆柴油机排放性能的影响,进行了4次矿用防爆柴油机台架试验。通过低浓度配气装置来调节CH_(4)流量进而实现浓度调节,试验CH_(4)浓度分别为1.00%、0.50%、0.30%和0,空气的温度、湿度和压力由进气空调给定,在6个工况点进行试验并采集尾气进行分析。试验结果表明:CH_(4)浓度会对矿用防爆柴油机的排放性能产生影响,但由于矿井CH_(4)浓度一般不得高于0.50%,因此其对于矿用防爆柴油机的影响较小。

排气系统结构类型对矿用防爆柴油机性能的影响规律研究

矿用柴油机防爆改造的关键在于降低排气温度,使其达到煤矿安全标准的要求。针对目前常见的3种排气系统,以1104D-E44T柴油机为试验样机,分别装配不同的排气系统,对柴油机进行外特性试验分析。结果表明:湿式排气系统排气背压较大,动力性能与经济性能下降明显;干式排气系统在相同的测试条件下,燃油消耗相比于湿式排气系统降低7.12%~14.37%,输出功率高出湿式排气系统2.2%~4.3%;干式排气系统的排放物NOx、HC、CO及PM仅为湿式排气系统的31.64%、28.29%、44.61%及17.72%,但排气温度和柴油机整机表面温度略高于湿式排气系统。

矿用柴油机防爆性能试验系统设计

目前井下胶轮运输装备大多以矿用防爆柴油机作为动力,国内矿用防爆柴油机大多由通用柴油机防爆改造而成,存在着防爆改造工作不到位而引发瓦斯爆炸的风险,因此其安全性能显得十分重要。根据MT 990-2006标准中对矿用柴油机防爆试验的要求,从试验仓设计、配气系统、测控加载系统、安全监控系统、机械传动系统等方面对矿用柴油机防爆性能试验系统进行规划设计与工艺布置。该试验系统已取得CNAS、CMA、安全生产和安全标志检验资质,具有试验能力大、技术先进、功能齐全的优点。

DOC+DPF对防爆柴油机气态污染物影响的试验研究

非道路柴油机国四排放标准HJ1014-2020《非道路柴油移动机械污染物排放控制技术要求》要求在2022年12月1日起非道路移动机械用柴油机必须满足国四排放要求,矿用防爆柴油机为满足国四排放要求也要做充足的前期研究。非道路柴油机多采用DOC+DPF的路线使得CO和颗粒满足国四排放要求,防爆柴油机的CO和颗粒实现国四排放要求也可以通过使用DOC+DPF达到。MT990要求防爆柴油机的表面温度不能超过150℃,使得DOC和DPF也需进行防爆改装后才能使用,所以增加防爆改装后的DOC+DPF对防爆柴油机的尾气排放究竟有何影响还有待实验验证。本文通过防爆柴油机台架试验研究防爆改装后的DOC+DPF对防爆柴油机排放的影响。

矿用防爆柴油机智能故障诊断技术研究

针对矿用防爆柴油机故障排除耗时、依赖经验和检修工具落后等问题,设计了一种集防抖、故障处理、主从识别和信息存储于一体的故障诊断管理系统,显著提高了维护效率与可靠性。同时,结合售后维修需求,提出了一种搭载融合多种无线通信技术的智能诊断仪的远程故障诊断方案,实现了对防爆柴油机的远程故障诊断、实时监测和远程升级等功能,为煤矿行业的高效运营提供了有力支持。