轻度混合动力AMT系统换挡品质控制

具有固定传动比的机械自动变速器(Automatic manual transmission,AMT)车辆,在换挡过程中,传动比会发生改变,造成离合器主、从动盘产生转速差,会使车辆在换挡过程中不可避免地出现换挡冲击.装备AMT的启动/发电一体化电机(Integrated startergenerator,ISG)型轻度混合动力系统,在换挡过程中,可利用ISG电动机的辅助动力作用,快速控制动力源,提高换档品质.在传统AMT车辆换挡过程分析的基础上,结合轻度混合动力车辆的特点,建立了动力源控制模型,提出了ISG电动机、发动机和离合器联合控制的换挡品质控制策略,在换挡过程中控制动力源转矩和转速,减小了轻度混合动力AMT车辆换挡冲击和动力中断时间.台架试验结果表明,装备AMT的轻度混合动力系统采用所提出的控制策略较传统控制策略能更有效地提高换挡品质.     

ISG型中度混合动力汽车驱动工况控制策略优化

在汽车动力学理论的基础上,通过对基于集成起动机/发电机(Integrated starter/Generator,ISG)的中度混合动力汽车(Medium hybrid electric vehicle,Medium-HEV)的系统效率进行瞬时优化计算,得到ISG型中度混合动力汽车控制策略,确定控制策略中三个关键系数:电池电量切换阈值XSC,发动机充电曲线系数Xe_chg和发动机关闭曲线系数Xe_off,以及它们的取值范围。在Matlab/Simulink仿真平台下,建立ISG型中度混合动力汽车整车仿真模型,将电池电量变化值△SC折算为等效油耗,以ISG型中度混合动力系统综合油耗最小为优化目标优选三个系数的取值,从而确定ISG型中度混合动力系统动力源的匹配和优化控制策略。仿真结果表明,与传统汽车相比,ISG型中度混合动力汽车的油耗降低了36.95%,明显提高了中度混合动力系统燃油经济性。     

混合动力电驱变速器耐久试验开发

混合动力电驱变速器EDU采用了插电式强混的形式,蓄电池和驱动电动机是EDU的主动力源,发动机为辅助动力源。EDU包含了TM电动机、ISG电动机、双离合器、二挡传动系统、差速器及同步器等主要部件。本文探讨了混合动力变速器耐久试验要求、试验     

ISG系统动力部件参数设计及仿真

分析了ISG混合动力系统的结构特点和基本功能要求.在此基础上对ISG混合动力汽车动力传动系中发动机功率、电动机以及蓄电池各项参数的选择依据进行了研究;通过计算实例,在Advisor仿真软件平台上对选择的参数进行仿真,并与传统燃油汽车的仿真结果进行比较,最后证明了所选参数的合理性.     

超轻度混合动力传动系统建模和仿真

分析超轻度混合动力汽车及其传动系统,采用键合图理论,建立了超轻度混合动力汽车高速纯无级调速工况下的整车传动系统键合图模型,列出高速挡传动系统的状态方程。建立整车控制仿真模型,制定高速挡控制策略并进行了仿真分析。     

基于无级变速传动的并联式混合动力汽车动力学仿真研究

采用金属带一行星齿轮无限级变速传动系统的并联式混合动力汽车,具有在相同动力性能下所需电动机功率小、燃油消耗少、废气排放低等特点。应用键合图理论,分析了双模态型并联式混合动力汽车的发动机、电动机及离合器等部件的性能参数以及变速器速比在汽车加速行驶过程中的变化规律,从而为进一步开发并联式混合动力汽车提供理论设计依据。     

ISG混合动力汽车动力总成的匹配方法研究

分析了ISG混合动力汽车动力总成参数对起动性能、加速性能、爬坡性能和最高车速性能的影响,给出了ISG混合动力汽车燃油经济性的设计要求,建立了蓄电池的匹配模型,着重阐述了蓄电池功率和能量的设计要求。将提出的ISG混合动力汽车的优化匹配设计方法应用于IVECO混合动力汽车的设计中,通过对比不同设计方案的结果,说明了本研究设计方法的可行性,根据优化结果给出了本设计相应的ISG-HEV系统参数。     

丰田PRIUS混合动力传动系统分析与建模

混合动力汽车传动系统的建模是混合动力汽车传动系统能量控制策略开发、仿真和优化的基础。对比分析了三代丰田PRIUS混合动力传动系统的结构和基本工作原理,建立了传动系统发动机、动力分离装置、电动/发电机和动力用蓄电池等各子系统模型,基于统一的动力传动系统结构建立了丰田PRIUS混合动力传动系统的运动学、动力学和能量守恒模型。     

轻度混合动力AMT汽车自动起步控制研究

利用ISG(integrated starter/generator)电机的助力功能,在车辆起步时辅助发动机工作,将动力源(发动机和ISG电机)转速维持在较低范围内,使车辆迅速平稳起步,大大减少了离合器的滑摩功.在建立轻度混合动力AMT汽车起步模型的基础上进行了仿真,并提出了车辆自动起步控制规律.     

新型动力耦合系统工作模式分析与参数匹配研究

为改善混合动力汽车的耗油特性与动力性能,提出了混联式双行星排动力耦合系统,针对该系统的各种工作模式进行了功率分流与转速转矩特性分析。完成了主减速比、行星机构特性参数的设计,以及发动机、电动机等传动系统关键部件的参数匹配。在MATLAB/Simulink环境下建立了整车物理仿真模型,仿真结果表明:循环工况下的耗油特性及动力性能得以改善,验证了该方案的可行性。     

一种混联式HEV瞬时优化监控策略的研究

以一种新型混联式混合动力电动汽车为具体对象，研究以瞬时等效燃油经济性为优化目标的能量管理监控策略。通过基于混合动力电动汽车整车及动力总成相关数学模型所建立的MATLAB／Simulink仿真优化平台，搜寻出了全部转速一转矩需求条件下动力总成各元件的理想能量分配及相应挡位，以MAP图的形式存储于车载监控器中。监控器根据混合动力电动汽车荷电保持的设计要求，按瞬时工况调用这些MAP图，以简单查表计算方式对理想值实时地作适当修正和调整。监控策略的有效性、实时性通过若干典型行驶工况仿真及实车应用得以证实，展现出良好的实用价值。     

混合动力汽车动力性和经济性道路试验

结合混合动力汽车的特点,根据传统汽车试验标准并参考SAE J1711混合动力轿车试验方法对EQ7200HEV第一轮样车进行了道路试验。试验包括0～100 km/h加速试验、最高车速试验、最大爬坡试验及ECE15工况燃油经济性试验等。试验结果表明,试验样车可以合理、准确的实现多工况切换与控制功能,燃油经济性与基础样车比较有所提高,但需在第二轮开发时重点提高动力性、经济性方面的研究。道路试验为样车参数标定、控制策略优化及系统匹配提供了理论依据,同时对混合动力汽车试验方法进行了有益的探讨。     

OPTIMAL TORQUE CONTROL STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLE WITH AUTOMATIC MECHANICAL TRANSMISSION

In parallel hybrid electrical vehicle (PHEV) equipped with automatic mechanical transmission (AMT), the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.     

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…     

混合动力汽车控制策略的研究现状及其发展趋势

对混合动力汽车的结构型式进行分类,HEV的动力系统基本可分为串联式、并联式和混联式3种,对并联型和串联型混合动力汽车控制策略研究现状进行分析。混联式混合动力系统结合了串联式和并联式两种结构的优点,使得能量流动的控制和能量消耗的优化具有更大的灵活性和可能性,并对混联式结构的几种控制方案进行了分析。指出混合动力汽车的控制策略不十分完善,需要进一步优化。控制策略不仅仅要实现整车最佳的燃油经济性,而且还要兼顾发动机排放、蓄电池寿命、驾驶性能、各部件可靠性及整车成本等多方面要求,并针对混合动力汽车各部件的特性和汽车的运行工况,使发动机、电动机、蓄电池和传动系统实现最佳匹配,兼顾上述各方面要求的优化控制策略的研究应是今后的研究重点。     

混合动力电动汽车的建模与仿真研究

按照设计要求,以TJ7100轿车为设计原型,针对ISG型混合动力电动汽车(HEV),使用Simulink建立了其动力系统的动态仿真模型,重点研究并制定了相应的电力助动控制策略.在ECE循环工况下对仿真模型进行了动力性和燃油经济性分析,为搭建动力总成试验平台提供了参考依据.结果表明,所制定的控制策略能有效地较低燃油消耗,使电池SOC值维持在一定的范围内.同时,仿真结果与实际情况基本相符,从而验证了所建仿真模型的正确性和合理性.     

Decoupling analysis for a powertrain mounting system with a combination of hydraulic mounts

The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrally-varying properties of the hydraulic mounts on the powertrain system cannot be ignored. To overcome the deficiency, an analytical quasi-linear model of the hydraulic mount and the coupled properties of the powertrain and hydraulic mounts system are formulated. The influence of the hydraulic mounts on the TRA decoupling of a powertrain system is analytically examined in terms of eigensolutions, frequency, and impulse responses, and then a new analytical axiom is proposed based on the TRA decoupling indices. With the experimental setup of a fixed decoupler hydraulic mount in the context of non-resonant dynamic stiffness testing procedure, the quasi-linear model of the hydraulic mount is verified by comparing the predictions with the measurement. And the quasi-linear formulation of the coupled system is also verified by comparing the frequency responses with the numerical results obtained by the direct inversion method. Finally, the mounting system with a combination of hydraulic mounts is redesigned in terms of the stiffness, damping and mount locations by satisfying the new axiom. The frequency and time domain results of the redesigned system demonstrate that the torque roll axis of the redesigned powertrain mounting system is indeed decoupled in the presence of hydraulic mounts (given oscillating torque or impulsive torque excitation). The proposed research provides an important basis and method for the research on a powertrain system with spectrally-varying mount properties, especially for the TRA decoupling.     

ENERGY MANAGEMENT STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLES

Energy management strategy (EMS) is the core of the real-time control algorithm of the hybrid electric vehicle (HEV). A novel EMS using the logic threshold approach with incorporation of a stand-by optimization algorithm is proposed. The aim of it is to minimize the engine fuel consumption and maintain the battery state of charge (SOC) in its operation range, while satisfying the vehicle performance and drivability requirements. The hybrid powertrain bench test is carried out to collect data of the engine, motor and battery pack, which are used in the EMS to control the powertrain. Computer simulation model of the HEV is established in the MATLAB/Simulink environment according to the bench test results. Simulation results are presented for behaviors of the engine, motor and battery. The proposed EMS is implemented for a real parallel hybrid car control system and validated by vehicle field tests.     

A study on regenerative braking for a parallel hybrid electric vehicle

In this paper, a regenerative braking algorithm is presented and performance of a hybrid electric vehicle (HEV) is investigated. The regenerative braking algorithm calculates the available regenerative braking torque by considering the motor characteristics, the battery SOC and the CVT speed ratio. When the regenerative braking and the friction braking are applied simultaneously, the friction braking torque corresponding to the regenerative braking should be reduced by decreasing the hydraulic pressure at the front wheel. To implement the regenerative braking algorithm, a hydraulic braking module is designed. In addition, the HEV powertrain models including the internal combustion engine, electric motor, battery, CVT and the regenerative braking system are obtained using AMESim, and the regenerative braking performance is investigated by the simulation. Simulation results show that the proposed regenerative braking algorithm contributes to increasing the battery SOC which results in the improved fuel economy. To verify the regenerative braking algorithm, an experimental study is performed. It is found from the experimental results that the regenerative braking hydraulic module developed in this study generates the desired front wheel hydraulic pressure specified by the regenerative braking control algorithm.     

OPTIMIZATION APPROACH FOR HYBRID ELECTRIC VEHICLE POWERTRAIN DESIGN

According to bench test results of fuel economy and engine emission for the real power-train system of EQ7200HEV car, a 3-D performance map oriented quasi-linear model is developed for the configuration of the powertrain components such as internal combustion engine, traction electric motor, transmission, main retarder and energy storage unit. A genetic algorithm based on optimization procedure is proposed and applied for parametric optimization of the key components by consideration of requirements of some driving cycles. Through comparison of numerical results obtained by the genetic algorithm with those by traditional optimization methods, it is shown that the present approach is quite effective and efficient in emission reduction and fuel economy for the design of the hybrid electric car powertrain.