汽车动力性与燃油经济性模拟仿真与传动系参数优化设计

在对汽车动力性与燃油经济性进行研究、建立了动力性和燃油经济性的计算机模拟仿真的基础上,以动力性和燃油经济性为目标函数,绘制燃油经济性-加速时间曲线.并根据燃油经济性-加速时间曲线来优化动力传动系主减速比,从而综合改善动力性和燃油经济性.     

汽车动力性和燃油经济性的计算机仿真与传动系参数优化设计

本文建立了汽车动力性和燃油经济性仿真计算的数学模型,编制了计算机仿真程序,在此基础上,以动力性和燃油经济性为目标函数,对传动系参数进行优化设计,从而改善其动力性和燃油经济性。     

基于改进遗传算法汔车动力传动系统性能仿真软件开发

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能，介绍了自主开发的VDS车辆动力学软件。通过实车道路和底盘测功机的性能试验对VDS软件进行验证。     

货车传动系参数优化匹配分析

汽车动力装置参数对其动力性和燃油经济性有很大影响。对汽车发动机与传动系的优化匹配进行了理论分析并采用偏置等比级数分配变速器速比;并以某轻型货车为例,基于GT-drive建立仿真模型,分析几种优化方案;最终选取最佳优化方案,相较原车在保证动力性基础上提高了燃油经济性。     

基于改进遗传算法汽车动力传动系统性能仿真软件开发

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能,介绍了自主开发的VDS车辆动力学软件。通过实车道路和底盘测功机的性能试验对VDS软件进行验证。     

基于改进遗传算法汽车动力传动系统性能仿真软件

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能,介绍了自主开发的VDS车辆动力学软件.通过实车道路和底盘测功机的性能试验对VDS软件进行验证.     

基于CRUISE的某轻型校车动力传动系统建模与仿真

论述了玉柴某款发动机匹配国内某汽车厂的轻型校车,利用CRUISE软件在开发过程中进行动力性和燃油经济性仿真分析的过程,结果表明,采用主减速比为4.1的主减速器可以获得良好的动力性和燃油经济性。     

基于遗传算法的商用车传动系的参数优化

研究了综合考虑动力性和燃油经济性指标的汽车动力传动系数学模型。以燃油经济性最佳为优化目标以及整车动力性作为约束条件,根据指定柴油机和整车参数,运用遗传算法对某商用货车的传动系参数进行优化计算。结果显示,优化后的传动系参数,使得整车在原地起步加速时间基本不变的情况下最高车速提高了2.98%,使得整车混合百公里油耗降低了0.67%。表明优化参数使整车的动力性和燃油经济性得到了不同程度的改善。     

某款发动机与整车匹配的动力性经济性分析

动力性和燃油经济性是车辆性能的重要评价指标。本文利用GT-SUITEmp建立了整车仿真模型,进行动力性、经济性计算。基于此模型,本文在原有主减速比的基础上改变了主减速比,仿真结果显示,优化后的主减速比,在NEDC循环工况下油耗有所降低。     

基于整车性能分析的越野汽车传动比优化

对某越野汽车进行了整车性能建模,对其动力性和燃油经济性进行了仿真分析,仿真分析结果与实车试验结果非常接近,由此校验了所建分析模型的准确性。基于所建立的分析模型,运用DOE试验设计方法,以汽车动力性和燃油经济性为目标,对汽车动力系传动比进行了优化,确定出了一组最佳的传动比;进一步分析表明:传动比优化以后,汽车动力性得到了较大幅度的提高,油耗水平也得到了优化。因此,所获得的最佳传动比为下一步工程实施提供了重要依据。     

某轿车动力传动系统参数匹配优化设计

为研究发动机和传动系统的合理匹配关系,提出在发动机已经选定的情况下,通过选择不同的传动系参数来使发动机的工作处于更加接近理想的工作区域.首先用AVL CRUISE软件对某轿车建模与仿真,得出动力性和经济性相关参数值,其后对主减速器和变速器参数进行优化,得到新的传动系参数.将优化后的整车动力性和经济性仿真结果与原车型相比,结果显示,该轿车的动力性变化不大,经济性有所改善.     

LJ276发动机电喷化改造设计

应用GT-Power软件搭建原机模型,并进行仿真计算,计算结果与试验结果基本吻合,验证了仿真模型的准确性。针对原机化油器的不足,建立了LJ276电喷化仿真模型,模拟性能有所提高。依次对进气系统结构进行了一系列的优化设计。结果表明,改进后的汽油机的动力性、燃油经济性均得到一定的改善。制作样机进行台架试验,与原机相比,电喷发动机扭矩最大提高9．2％,功率最大提高9．2％,燃油消耗率最大降低15．4％。     

Power-balancing instantaneous optimization energy management for a novel series-parallel hybrid electric bus

Energy management(EM) is a core technique of hybrid electric bus(HEB) in order to advance fuel economy performance optimization and is unique for the corresponding configuration. There are existing algorithms of control strategy seldom take battery power management into account with international combustion engine power management. In this paper, a type of power-balancing instantaneous optimization(PBIO) energy management control strategy is proposed for a novel series-parallel hybrid electric bus. According to the characteristic of the novel series-parallel architecture, the switching boundary condition between series and parallel mode as well as the control rules of the power-balancing strategy are developed. The equivalent fuel model of battery is implemented and combined with the fuel of engine to constitute the objective function which is to minimize the fuel consumption at each sampled time and to coordinate the power distribution in real-time between the engine and battery. To validate the proposed strategy effective and reasonable, a forward model is built based on Matlab/Simulink for the simulation and the dSPACE autobox is applied to act as a controller for hardware in-the-loop integrated with bench test. Both the results of simulation and hardware-in-the-loop demonstrate that the proposed strategy not only enable to sustain the battery SOC within its operational range and keep the engine operation point locating the peak efficiency region, but also the fuel economy of series-parallel hybrid electric bus(SPHEB) dramatically advanced up to 30.73% via comparing with the prototype bus and a similar improvement for PBIO strategy relative to rule-based strategy, the reduction of fuel consumption is up to 12.38%. The proposed research ensures the algorithm of PBIO is real-time applicability, improves the efficiency of SPHEB system, as well as suite to complicated configuration perfectly.     

串联式混合动力推土机系统建模及性能仿真

为了从理论上对混合动力推土机进行研究,并从中找到有利于系统节能的有效途径,以某传统动力推土机为原型,运用AVL CRUISE和MATLAB/Simulink软件建立基于电池的双电机串联式混合动力推土机的仿真模型.通过试验采集原型机在典型工况下的速度谱和载荷谱验证仿真模型和设计推土机工况,从而研究混合动力推土机的动力性和经济性.仿真结果表明:双电机串联式混合动力推土机方案能实现原机的动力性,稳定发动机工作点,提高燃油经济性.     

无凸轮式配气型线优化设计及发动机性能仿真研究

本文基于AVL-boost建立一维发动机仿真模型,对采用无凸轮式配气型线的发动机整机性能进行数值模拟。仿真结果表明:采用无凸轮式配气型线可以根据不同工况灵活调整气门升程及相位,能够有效降低发动机部分负荷工况下的换气损失,改善发动机的动力性及燃油经济性,为无凸轮式配气机构的控制应用提供了理论依据。     

PERFORMANCE SIMULATION OF VEHICLES EQUIPPED WITH TRACTION DRIVE CVTS

0 INTRODUCTIONVehicles equipped with continuously variable transmission(CVT) have the potential of better fuel economy than vehicleswith conventional stepped ratio transmissions. Although the mar-ket penetration of CVT vehicles today is still insignifican…     

燃料电池汽车动力系统功率平衡控制策略

燃料电池汽车动力总成控制的主要目的是平衡各个动力总成部件如燃料电池发动机、动力蓄电池和电动机之间的功率流向和能量平衡,使车辆保持较好的动力性和经济性。依据燃料电池汽车动力系统基本拓扑结构,提出了基于DC/DC变换器电流控制方式和基于模糊决策的蓄电池恒荷电状态控制的动力系统功率平衡控制算法,在MATLAB环境中进行了离线仿真,并用快速控制原型方法进行了实车试验验证。     

Demonstrating Improved Fuel Economy Using Subsystem Specific Lubricants on a Modified Diesel Engine

Fuel economy performance in modern internal combustion engines is of increasing importance to lubricant formulators due to regulations targeting global greenhouse gas emissions. Engines typically employ a single lubricant, with a common sump, to service all components. As a result, base oil and additive selection for fuel economy performance is a compromise among competing demands for different engine subsystems. Opportunities for significant fuel economy improvement through targeted formulation of lubricants for specific engine subsystems are presented, with specific emphasis on segregating the lubricant supplies for the valve train and the power cylinder subsystems. A working prototype was developed in a lab environment by modifying a commercially available twin-cylinder diesel engine. Motored valve train and whole-engine fired test results were obtained and compared to model data. Fuel economy benefits were demonstrated using market representative heavy-duty diesel lubricants, including mineral oil and polyalphaolefin (PAO) blends. The fuel economy benefits of a dual-loop lubricant system are demonstrated through significant viscosity reduction in the power cylinder subsystem, achieving overall engine friction reductions of up to 8% for the investigated operating condition. Results suggest that additional gains may be realized through targeted base oil and additive formulation. Implications for incorporation in larger diesel engines are also considered.     

柴油甲醇双燃料发动机动力性与经济性试验分析

介绍了柴油引燃甲醇双燃料燃烧对柴油机动力性和经济性的影响。在1台单缸、直喷、中冷柴油机上采用柴油引燃甲醇双燃料进行试验。结果显示甲醇柴油双燃料发动机在中高负荷及中高转速下运转可获得较好的燃油经济性。选择适当的引燃柴油量,双燃料发动机的动力性可以达到甚至超过原柴油的动力性。     

4100甲醇发动机与汽油发动机简介

介绍自行设计的4100电控四气门甲醇发动机与汽油机的结构特点，以及采用的先进技术。该机是为适应我国的国防安全和国民经济持续发展的需要设计的非石油燃料高效低污染发动机，动力性和经济性达到国内先进水平．排放指标可达欧Ⅱ标准。