高压共轨系统调压阀的设计仿真与实验研究

调压阀是高压共轨系统轨压控制的核心元件,调压阀的设计结果关系到整个系统油压的波动性及响应性．从比例电磁阀的设计步骤入手,设计了调压阀．采用ANSYS进行了仿真分析．实验表明,调压阀的设计结果满足实际需求．     

车用发动机交流电力测试系统的研发

介绍了自行研制开发的30kW交流电力测试系统的总体设计以及系统硬件的选择,利用该系统进行了稳态测试实验.实验表明,该系统响应速度快,并能够实现对稳态测试的自动控制.     

压电式高压共轨喷油器的驱动研究

设计了一个通过检测喷油器电流和电压的压电啧油器驱动电路,以实现压电喷油器精确闭环控制和能量回收,提出了基于该电路的控制策略,并通过测试对比得出最优控制策略.试验证明,设计的驱动电路可实现压电喷油器的快速充放电和精确的电压控制,当喷油器内压电堆电容为3.3μF时,充放电时间分别为120μs和100μs,并可实现单循环5次喷射.能量回收电路在节省了驱动能量的同时还降低了散热的需求,使压电喷油器单次喷射能量消耗约为0.048 J,小于相同试验条件下电磁阀式喷油器的能量消耗.     

车用发动机电控应用开发系统研究

发动机电控技术是提高动力性、经济性、降低排放性能的主要措施，电控系统综合优化控制软件的开发是一件费时耗力的工作．发动机电控应用开发系统（ADS）研究开发用以提高电控系统匹配软件设计效率．本文介绍在综合论述ADS系统的软硬件特点的基础上，系统通过在国产492QA发动机的电控匹配试验证明了系统的实用性．     

Dynamic torque response analysis of IPMSM in flux weakening region for HEV applications

An over-modulation based vector control strategy for interior permanent magnet synchronous machine (IPMSM) is proposed and investigated. The strategy increases the reference flux weakening voltage to improve efficiency in flux weakening region of IPMSM with the same dynamic torque response performance in standard SVM technique. The relationship between dynamic torque performance and the reference flux weakening voltage is also discussed. In order to achieve fast and smooth shift process, the torque response must be less than 20.ms in the parallel hybrid electric vehicle (HEV), according to this, modeling and experimental studies were carried out. The results show that the proposed strategy can achieve the same dynamic and steady state torque performance with higher reference flux weakening voltage, which means higher efficiency.     

Influence of eddy current on transient characteristics of common rail injector solenoid valve

Influence of eddy current on transient characteristics of common rail injector solenoid valve was studied in this paper. Experimental investigations of drive current and power source voltage of both drive current ascending and descending process were conducted on a common rail injector solenoid valve. A new discretizing calculation method of solenoid valve flux linkage was put forward for the first time based on the experimental results and drive circuit principle,and flux linkage of both drive current ascending and descending process were evaluated.New inductance calculation methods for drive current ascending and descending process respectively were also presented. Influence of parasitic inductance was evaluated. Results indicate that the air gap,under which the transient flux linkage of the solenoid valve is the biggest,varies with drive current due to eddy current.Flux linkage of drive current descending process is bigger than that of drive current ascending process under the same drive current and the same air gap width. Eddy current can reduce the delay between the time that drive current begins to descend and the time that armature begins to move downward. Inductance of drive current descending process is bigger than that of drive current ascending process over larger scope of drive current,but the difference becomes smaller with the increasing of air gap width. The differences of both flux linkage and inductance between drive current ascending and descending process are caused by the eddy current in core and armature materials.     

柴油机管理系统研究

目的进行柴油机综合管理系统研究,利用柴油机管理系统可综合考虑系统多参数的特点,以获得柴油机的最优性能．方法在分析柴油机管理系统特点的基础上,采用实时多任务系统分析方法,结合大功率柴油机电控系统进行电控综合管理系统软硬件开发．结果与结论电控管理系统进行了台架匹配试验,初步验证了系统的功能,为开发出完整的柴油机管理系统奠定了基础．     

Mesh Generation and Dynamic Mesh Management for KIVA-3V

To improve mesh quality for KIVA-3V a method has been developed for rapid mesh generation and dynamic mesh management with moving valves for internal combustion engines.Two phases are included in rapid mesh generation:the initial mesh generation and the mesh pre-treatment.In the second step (pre-treatment),the connectivity of those cells is generated by a new algorithm added to the KIVA-3V code after the initial mesh generated.In dynamic mesh management phase,a new rezoning algorithm is developed and the basic principle is that the rezoning starts from the moving part.The movement of the adjustment is treated as an "earth quake wave" propagating to the surrounding vertexes.The amount of coordinate adjustment of the surrounding vertexes is determined by the movement of the epicenter and the distance between the vertexes and the "epicenter".Finally,a real IC engine mesh is generated and managed according to the new method.It gives a new theory and a new method for creating and managing the mesh in IC engine.     

共轨系统多次喷射油量波动与轨压的关系

高压共轨系统进行多次喷射时,前一次喷射引起的高压油管内燃油压力波动会导致后一次喷射的喷油量出现偏差。在两个不同的第1次喷射脉宽下,研究轨压对两次喷射中第2次喷射油量波动幅度的影响。结果表明,轨压对第2次喷射油量波动幅度的影响因第1次喷射脉宽的不同而呈现出不同的规律。分别在两个喷射脉宽下研究轨压对单次喷射引起的压力波动幅度的影响。结果显示,小脉宽下,轨压对单次喷射引起的压力波动幅度的影响规律与轨压对第2次喷射油量波动幅度的影响规律相同,但大脉宽下的影响规律稍有不同。讨论轨压对油量波动幅度的影响机理,提出喷油时间波动系数,该系数说明轨压对第2次喷射喷油量波动的影响机理,得到轨压对喷油量波动幅度的影响规律。     

轮毂电机独立驱动电动汽车线性时变模型预测主动安全控制

为解决轮毂电机独立驱动电动汽车的主动安全控制和参数估计问题,提出自适应质心侧偏角观测器和基于线性时变理论的模型预测横摆稳定控制策略。首先,建立指数型的滑模观测器识别质心侧偏角,并利用闭环侧向力积分算法消除观测器的稳态误差。然后,引入线性时变理论(Line-time varying,LTV)构建轮胎的准线性模型,并基于此设计横摆稳定系统的模型预测控制器(Model predictive controller,MPC)。为减少控制器的计算负担并提高系统的瞬态响应,采用Laguerre网络拟合全时域的预测控制序列。通过求解具有不等式约束的二次规划函数,获取所需要的外部横摆力矩,并将其分配至4个轮毂电机。数值仿真和实车试验结果表明,提出的自适应滑模观测器可以精确地观测质心侧偏角,具有很强的鲁棒性;提出的横摆稳定控制器可以解决轮胎的非线性饱和问题,进一步提高车辆的主动安全性。