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控制策略参数优化是提高混合动力汽车燃油经济性和降低排放的关键,这类优化问题涉及多个相互冲突目标,而且属于非线性约束问题。文中采用遗传算法,基于MATLAB编程,调用ADVISOR对混合动力汽车参数进行优化,结果表明,该方法可找到多组可行解,在保证车辆动力性前提下提高燃油经济性和降低排放。 相似文献
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为实现混合动力汽车的动力性、燃油经济性以及模式切换平顺性,以基于CVT的插电式混合动力汽车为研究对象,针对混合动力汽车的多目标优化问题,提出一种可变逻辑门限控制策略.整车控制过程中根据功率需求进行模式切换,其中行驶需求功率根据车速和节气门开度计算得到,切换门限根据整车参数实时计算.以发动机和电机的输出特性、电池的SOC为主要依据计算工作模式切换的可变逻揖门限值.通过电机助力保证整车具有较好的动力性能,通过不同模式下驱动功率的一致性实现模式切换平顺,通过小功率需求时仅可能多用纯电动来提高燃油经济性.在MATLAB/Simulink平台下建立混合动力汽车前向仿真模型,并在NEDC工况下进行仿真.仿真结果表明:整车动力性能得到了提高,实现了模式切换平顺性,节油40%. 相似文献
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针对目前汽车悬架设计中存在的问题,提出了一种基于近似模型和遗传算法的高效全局优化设计方法.使用Kriging方法重构目标函数,建立了悬架运动学分析的近似模型;采用了CVT试验设计以确保参数空间中样本点分布的均匀性;在重构出的目标函数基础上采用遗传算法进行寻优.以双横臂式前独立悬架为例,以车轮接地点侧向最大滑移量为优化目标进行了优化设计.结果表明,采用该设计方法可缩短设计周期及降低设计成本. 相似文献
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《汽车安全与节能学报》2015,(3)
提出了一种并联式混合动力汽车(HEV)参数综合优化算法,以解决其能量管理与动力系统匹配经常各自独立进行的问题。该方法考虑电驱动系统成本,用改进型模糊能量管理策略,以能量管理策略参数、动力系统匹配参数为决策变量,以等效综合油耗、电机与电池组总成本为目标函数,在ADVISOR仿真环境下,用多目标遗传算法优化求解。结果表明:在保证整车动力性的前提下优化后,等效油耗降低23.0%,电机和电池组总成本降低41.9%;一氧化碳CO的100 km排放质量降低10.8%,碳氢化合物HC的排放降低22.2%,氮氧化物NOx的排放降低27.0%,改善了发动机效率与电机效率;验证了该方法的有效性。 相似文献
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Plug-in Hybrid Electric Vehicle (Plug-in HEV) has dramatic improvements in fuel economy and emission reduction. It is most important to decide its optimal configuration, energy management strategy, powertrain sizes, and control logic parameters. For multi-objective optimization, we present a concurrent optimization methodology based on an optimal Plug-in HEV powertrain configuration with continuous variable transmission (CVT). The novelty is using evolutionary algorithm in conjunction with an instantaneous optimal energy management strategy. Simulation results indicate the proposed method can significantly reduce fuel consumption and emissions by simultaneously optimizing the propulsion system parameters as well as the energy control parameters. 相似文献
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Jongryeol Jeong Namwook Kim Wonsik Lim Yeong-Il Park Suk Won Cha Myeong Eon Jang 《International Journal of Automotive Technology》2017,18(5):891-900
In a hybrid electric vehicle (HEV) system, it is an important issue on how to distribute the output power from multiple power generating components to operate a vehicle more efficiently. Many studies have been conducted on how to manage multiple power sources of a vehicle based on various optimization theories. In this study, an algorithm to calculate the optimization of a series HEV that has three power generating components, engine, battery and ultra-capacitor, is developed based on dynamic programming. Normally dynamic programming is applied to the optimization of power management and components sizing by estimating potential fuel economy for electrified vehicle such as HEV, Plug-in HEV or Fuelcell HEV. In contrast with most objective systems that have only two power generating components, the system in this study has three power sources. Since the system has three power sources, the number of state and control variables of optimization problem increases. Therefore the number of calculations increases unreasonably. To decrease the number and time of calculations, a new electric model that contains the both characteristics of battery and ultra-capacitor is developed with some assumptions. In comparison with the optimization algorithm which follows the theory of DP with no assumptions, the results from the newly developed algorithm has 1.04 % discrepancy in terms of fuel economy, even though the calculation time decreases to 4400 times less. 相似文献
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This paper presents the optimization of key component sizes and control strategy for parallel hybrid electric vehicles (parallel HEVs) using the bees algorithm (BA). The BA is an intelligent optimization tool that mimics the food foraging behavior of honey bees. Parallel HEV configuration and electric assist control strategy were used to conduct the research. The values of the key component size and the control strategy parameters were adjusted according to the BA to minimize the weighted sum of fuel consumption (FC) and emissions, while the vehicle performance satisfies the PNGV constraints. In this research, the software ADVISOR was used as the simulation tool, and the driving cycles FTP, ECE-EUDC and UDDS were employed to evaluate FC, emission and dynamic performance. The results demonstrate that the BA is a powerful tool in parallel HEV optimization to determine the optimal parameters of component sizes and control strategy, resulting in the improvement of FC and emissions without sacrificing vehicle performance. In addition, the BA is able to define a global solution with a high rate of convergence. 相似文献
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PSO algorithm-based parameter optimization for HEV powertrain and its control strategy 总被引:1,自引:0,他引:1
The coordination between the powertrain and control strategy has significant impacts on the operating performance of hybrid
electric vehicles (HEVs). A comprehensive methodology based on Particle Swarm Optimization (PSO) is presented in this paper
to achieve parameter optimization for both the powertrain and the control strategy, with the aim of reducing fuel consumption,
exhaust emissions, and manufacturing costs of the HEV. The original multi-objective optimization problem is converted into
a single-objective problem with a goal-attainment method, and the principal parameters of powertrain and control strategy
are set as the optimized variables by PSO, with the dynamic performance index of HEVs being defined as the constraint condition.
Computer simulations were carried out, which showed that the PSO scheme gives preferable results in comparison to the ADVISOR
method. Therefore, fuel consumption and exhaust emissions of HEVs can be effectively reduced without sacrificing dynamic performance
of HEVs. 相似文献
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混合动力电动汽车模糊逻辑控制策略的研究与仿真 总被引:6,自引:0,他引:6
以四川汽车工业集团野马混合动力电动汽车设计要求为基础,提出了一种混合动力电动汽车模糊逻辑控制策略。这种策略通过对油耗和各排放参数动态地分配权重值确定出发动机的最佳转矩,然后再根据模糊控制原理,以电池SOC值、汽车驱动需求的输出转矩和电动机转速为模糊输入确定出发动机的实际输出转矩,最终实现整车油耗和排放的综合优化。通过在S imu link软件中搭建该控制策略的仿真模型并与基础的电力辅助控制策略相比较,证明了这种控制策略有利于整车运行经济性和环保性的提高。 相似文献