共查询到19条相似文献,搜索用时 203 毫秒
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为了提高插电式混合动力汽车(PHEV)在电量保持下的燃油经济性,并解决插电式混合动力汽车在运行过程中动力元件效率对系统能量利用率影响的问题,制定了系统效率最优的控制策略。以PHEV关键动力部件的测试数据为基础,建立发动机、驱动电机、无级变速器(CVT)以及动力电池等关键部件的效率数值模型,并考虑了温度及荷电状态(SOC)对动力电池充放电功率的影响。设计以混合动力系统效率最优为适应度评价函数,将CVT速比、发动机转矩作为优化变量,以车速、加速度和SOC为状态变量,在动力性指标的约束下,运用遗传算法进行迭代寻优,PHEV的系统效率在第20代左右收敛于全局最优值。同时发动机转矩和CVT速比通过多代遗传进化,较快收敛于最佳值。将相关优化结果与车速、加速度拟合成相应的三维控制数表,综合数值建模和试验测试数据建模的方法,基于MATLAB/Simulink搭建插电式混合动力汽车整车控制策略仿真模型,采用新欧洲行驶循环工况进行仿真验证。结果表明:插电式混合动力汽车在电量保持模式下,利用遗传算法优化的系统效率最优控制策略相比优化前,动力电池SOC运行更为平稳,CVT效率有所提升,驱动电机及发动机转矩分配更为合理;百公里燃油消耗量从优化前的5.2 L降至4.5 L,燃油经济性提升了13.5%。 相似文献
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为了进一步发挥混合动力汽车的节油性能,插电式混合动力汽车(Plug-in Hybrid Electric Vehicle,PHEV)在电量消耗(Charge-Depleting,CD)模式下,制订系统效率最优的能量管理策略来提高整车的电消耗行驶里程,进而实现提升整车燃油经济性的目的。分析了系统在电量消耗模式下相关典型工作模式,以车辆动力学方程为基础,推导出系统效率模型。以需求转矩、动力电池荷电状态、电机转速作为动力系统的输入,将系统效率最优作为系统的目标价值函数,在动力性指标的约束下,优化获得在电量消耗模式下的电机转矩和无级变速器速比的最佳控制规律,综合数值建模和试验数据建模方法,基于Matlab/Simulink软件平台构建插电式混合动力汽车的发动机、驱动电机、无级变速器(CVT)和动力电池等动力传动系统关键部件效率数值模型和整车动力学模型以及驾驶员模型,在新欧洲行驶循环(New European Driving Cycle,NEDC)工况下进行模型在环循环仿真验证分析。仿真结果表明,插电式混合动力汽车在电量消耗模式下,基于系统效率最优的能量管理策略能够使动力电池运行更加高效,转矩的分配更为合理,无级变速器获得较佳的控制规律。与直观式逻辑控制相比,纯电动续航里程提升了10.9 km,即经济性提高了15.3%,充分体现了所制订的控制策略的有效性。 相似文献
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分析了ISG型混合动力系统根据发电转矩来调整发动机工作点的控制机理,然后结合各部件效率对发动机工作点调整前后的能耗参数进行了计算、仿真与分析.结果表明,发动机的低油耗工作点未必是整车的高效率点.为此设计了一种能根据混合动力系统整体效率来调整发动机工作点的控制方法. 相似文献
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文章以某款混合动力汽车为研究对象,确定整车性能目标,根据车辆具体参数对发动机、电机、电池等动力系统主要部件参数进行计算与选型,设计了电控机械式自动变速器(AMT)和机械式无级变速器(CVT)两种传动方案;在Cruise软件中构建仿真模型,测试最高车速、加速度、爬坡度等动力性指标;使用新欧洲驾驶循环(NEDC)工况进行经济性仿真对比测试不同传动方案对油耗的影响。仿真结果表明,整车动力性满足要求,动力系统参数选择合理,CVT传动方案发动机运行效率更高。 相似文献
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为了提升插电式混合动力汽车(PHEV)的动力系统的真实能效,从综合能效最优的角度,研究了插电式混合动力系统能量管理策略.针对系统综合效率的时变性和耦合性,建立了系统效率评价模型,对电池储存电能的效率进行评价和动态修正,以系统综合效率最优为目标,结合粒子群优化算法,构建了能量管理策略.基于GT-Suite和Simulin... 相似文献
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A modified CVT ratio map is proposed to obtain the improved fuel economy for a metal belt CVT. Since the CVT system loss,
which occupies most of the drivetrain loss, depends on the engine speed, input torque, primary and secondary actuator pressure,
a modified CVT ratio map is produced to realize the highest engine-CVT overall efficiency through the consideration of CVT
system loss. The modified CVT ratio map is constructed with respect to the demanded vehicle power and present vehicle speed
based on the steady state CVT system loss. Using the modified CVT ratio map, performance simulations are carried out using
the dynamic models of the CVT powertrain. The simulation results indicate that the modified CVT ratio control provides improved
engine-CVT overall system efficiency, and improves the fuel economy of the federal urban driving schedule by 4.9 percent. 相似文献
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C. Ma J. Kang W. Choi M. Song J. Ji H. Kim 《International Journal of Automotive Technology》2012,13(3):505-516
A comparative study was performed on two types of plug-in hybrid electric vehicles (PHEVs): the GM Volt and the Toyota Prius
Plug-in Hybrid. First, the powertrain models of the two vehicles were derived. Based on the dynamic models, a detailed component
control algorithm was developed for each PHEV. Specifically, a control algorithm was proposed for motor generator 1 (MG1)
and MG2 to achieve optimal engine operation. Additionally, an energy management strategy for selecting the operation mode
was developed from the viewpoint of fuel economy, battery state of charge and vehicle velocity. Using the dynamic model of
the control algorithm for each PHEV, simulations were performed, and the simulation results were verified by comparing them
with those obtained using the Powertrain System Analysis Toolkit simulator for the plug-in Prius. Based on the simulation
results, a comparative study was performed, and it was found that the role and capacity of MG1 and MG2 and the mode selection
algorithm must be determined depending on the configuration of the PHEV. 相似文献
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Heeyun Lee Juyean Sung Hyeokjun Lee Chunhua Zheng Wonsik Lim Suk Won Cha 《International Journal of Automotive Technology》2018,19(4):687-694
In this study, a model-based integrated control method for engines and continuous variable transmissions (CVTs) is developed. CVT refers to a type of transmission which allows an engine to be operated independently with respect to the vehicle speed, with the engine torque and CVT gear ratio controlled in an integrated manner. In the proposed integrated control scheme, engine operating points which minimize the rate of instantaneous fuel consumption are calculated, and the engine target torque and target gear ratio are determined in an integrated manner based on the results of the calculations. Unlike the previous map-based control method, the method introduced in this study does not require an engine torque map or a CVT ratio map for tuning, and the engine torque and CVT ratio are controlled to minimize the amount of fuel used while satisfying the level of acceleration demand from the driver. The control scheme is based on the powertrain model, and the CVT response lag and transmission loss are also considered in the integrated control processes. The algorithm is simulated with various driving cycles, with the simulation results showing that the fuel economy performance of the vehicle system is improved with the newly suggested engine-CVT integrated control algorithm. 相似文献
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Yuanchun Cai Minggao Ouyang Fuyuan Yang 《International Journal of Automotive Technology》2017,18(3):473-487
Series-parallel PHEV city buses combine the advantages of series and parallel configurations and have been used in China. However, the design and energy management of series-parallel PHEV city buses based on Chinese driving conditions still need to be investigated. In this paper, an equivalent consumption minimization strategy is provided to optimize energy management for series-parallel PHEV city buses, and the process of the equivalent consumption minimization strategy for series-parallel is presented in this paper. Compared with the validated rule-based energy control strategy, ECMS shows a fuel economy improvement of 8.2 % in the CBCD (Chinese Bus Driving Cycle). Based on the optimal energy management, a design for a generator motor in the series-parallel configuration has been processed. The fuel consumption has been shown to decrease, with an increase in generator power, because the system with the higher generator power can work at a higher efficiency in the series mode and operate the engine in the high efficiency area in the parallel mode. Besides, in terms of costof- ownership for a PHEV bus for lifetime of 8 years, although the high generator power will lead to high purchase cost for series-parallel PHEV bus, a series-parallel PHEV city bus with a generator of 100 kW maximum power will still show small advantage in cost-of-ownership, based on current motor price and natural gas price. 相似文献
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Design of an energy management strategy for parallel hybrid electric vehicles using a logic threshold and instantaneous optimization method 总被引:2,自引:0,他引:2
Y.- J. Huang C.- L. Yin J.- W. Zhang 《International Journal of Automotive Technology》2009,10(4):513-521
A novel parallel hybrid electric vehicle (PHEV) configuration consisting of an extra one-way clutch and an automatic mechanical
transmission (AMT) is taken as the study subject of this paper. An energy management strategy (EMS) combining a logic threshold
approach and an instantaneous optimization algorithm is developed for the investigated PHEV. The objective of this EMS is
to achieve acceptable vehicle performance and drivability requirements while simultaneously maximizing engine fuel economy
and maintaining the battery state of charge (SOC) in its rational operation range at all times. Under the MATLAB/Simulink
environment, a computer simulation model of the studied PHEV is established using the bench test results. Simulation results
for the behavior of the engine, motor, and battery illustrate the potential of the proposed control strategy in terms of fuel
economy and in keeping the deviations of SOC at a low level. 相似文献
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Erfan Taherzadeh Shahram Javadi Morteza Dabbaghjamanesh 《International Journal of Automotive Technology》2018,19(6):1061-1069
Recently Plug-in hybrid electric vehicles (PHEVs) have gained increasing attention due to their ability to reduce the fuel consumption and emissions. In this paper a new efficient power management strategy is proposed for a series PHEV. According to the battery state of charge (SOC) and vehicle power requirement, a new rule-based optimal power controller with four different operating modes is designed to improve the fuel economy of the vehicle. Furthermore, the teaching-learning based optimization (TLBO) method is employed to find the optimal engine power and battery power under the specified driving cycle while the fuel consumption is considered as the fitness function. In order to demonstrate the effectiveness of the proposed method, four different driving cycles with various numbers of driving distances for each driving cycle are selected for the simulation study. The performance of the proposed optimal power management strategy is compared with the rule-based power management method. The results verify that the proposed power management method could significantly improve the fuel economy of the series PHEV for different driving conditions. 相似文献
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为改善插电式混合动力汽车(PHEV)的燃油经济性,提出一种基于规则的能量管理策略.结合智能网联汽车技术,利用烟花算法(F WA)结合系统约束条件,对能量管理策略参数进行优化,以求使车辆在变化的路况下能耗最低.为减轻沉重运算负荷,设计了一种事件触发机制来控制优化操作的启停.当车辆油耗超过预设上限则开始优化,一旦油耗满足预... 相似文献