农用皮卡传动系统参数优化及换挡策略研究

发布时间：2018-05-13 14:41

本文选题：皮卡 + 传动系　；参考：《中南林业科技大学》2017年硕士论文

【摘要】：皮卡作为农产品物流和现代农业发展的一种重要的交通运输工具,它既有轿车乘坐舒适性又具有一定载货的能力是农业现代化和新农村建设的重要组成部分。由于皮卡常在农村道路行驶,需克服复杂的行驶工况,其动力性影响整车的通过性、使用性和操控性,其燃油经济性影响农户的使用成本及能否满足国家燃油消耗要求,其排放性则直接决定该车能否达到国家排放标准而获得生产和上市许可。本文以皮卡整车的动力性、燃油经济性及排放特性为优化目标,对整车进行了传动系参数优化及换挡策略优化,并通过整车仿真模型对各优化方案进行动力性、燃油经济性及排放性仿真对比分析,最终采用整车性能综合评价体系对各方案进行综合评价。本文对传动系参数优化匹配的方法和整车匹配的评价指标进行了深入探讨,并建立了整车性能综合评价体系;根据原车相关参数及实验数据,应用GT-Drive软件建立皮卡整车仿真模型,对整车仿真模型进行静力学、动力学及运动学仿真,将仿真结果与原车实测数据或官方公布数据进行比对,完成整车仿真模型校准;对皮卡匹配原传动系参数进行仿真计算,分析发现皮卡匹配原传动系存在的问题及导致原因,为传动系优化提供改进思路和途径;建立了一套完整的传动系优化匹配的方法,并采用VBA开发出传动系参数优化程序,该程序可根据客户需求进行正向传动系参数设计,计算方便快捷;在皮卡匹配优化后传动系的基础上,进一步研究换挡策略,建立了最佳经济性换挡策略数学模型,并制定了最佳经济性换挡策略基本原则,利用GT-Drive中求解模块得到最佳经济性换挡策略曲线;调用生成的最佳经济性换挡策略进行整车仿真计算,分析了整车动力性、燃油经济性及排放性,对比分析整车优化传动系前后、整车既优化传动系又优化换挡策略前后车辆各项性能指标变化;最后通过建立的综合评价体系对原车方案、优化传动系方案、既优化传动系又优化换挡策略方案进行综合评价,其对应整合性能评价值分别为0.91、0.95、0.98,评价值越大,整车综合性能越好,因此,皮卡匹配既优化传动系又优化换挡策略方案整车综合性能最佳,达到了优化目的。
[Abstract]:As an important means of transportation for agricultural products logistics and modern agriculture development, pick-up truck is an important part of agricultural modernization and the construction of new countryside. Since pickup trucks often drive on rural roads, they need to overcome complex driving conditions, and their power performance affects the passing, use and control of the whole vehicle, and their fuel economy affects the cost of use of farmers and whether they can meet the requirements of national fuel consumption. Its emission directly determines whether the vehicle can meet the national emission standards and obtain production and marketing permits. In this paper, the power performance, fuel economy and emission characteristics of the truck are optimized, the parameters of the transmission system and the shift strategy are optimized, and the power performance of the optimized schemes is carried out through the simulation model of the whole vehicle. The fuel economy and emissivity are compared and analyzed. Finally, the comprehensive evaluation system of vehicle performance is adopted to evaluate the schemes. In this paper, the optimization matching method of transmission system parameters and the evaluation index of vehicle matching are discussed in depth, and a comprehensive evaluation system of vehicle performance is established, which is based on the related parameters of the original vehicle and the experimental data. The GT-Drive software is used to establish the vehicle simulation model of pickup truck. The simulation model of the whole vehicle is simulated by statics, dynamics and kinematics. The simulation results are compared with the measured data of the original vehicle or the official published data to complete the calibration of the vehicle simulation model. The paper simulates the parameters of the original transmission system of the pickup truck, finds out the existing problems and causes of the original transmission system of the truck matching, provides an improved train of thought and approach for the optimization of the transmission system, and establishes a set of complete methods for the optimization and matching of the transmission system. The optimization program of transmission system parameters is developed by using VBA. The program can design the parameters of forward transmission system according to the customer's demand, and the calculation is convenient and quick. On the basis of the optimized transmission system matching with the pick-up truck, the shift strategy is further studied. The mathematical model of the optimal economic shift strategy is established, and the basic principles of the optimal economic shift strategy are established. The optimal economic shift strategy curve is obtained by solving the module in GT-Drive. The optimal economic shift strategy is used to simulate the whole vehicle, and the power performance, fuel economy and emission of the whole vehicle are analyzed, and the transmission system before and after the optimization of the whole vehicle is compared and analyzed. The vehicle performance index changes before and after optimizing the transmission system and shifting strategy. Finally, through the established comprehensive evaluation system, the original vehicle scheme, the optimized transmission system and the shift strategy scheme are comprehensively evaluated. The corresponding integrative performance evaluation values are 0.91g 0.95 / 0.98, respectively. The greater the evaluation value is, the better the overall performance of the whole vehicle is. Therefore, the truck matching has the best comprehensive performance, which not only optimizes the transmission system but also optimizes the shift strategy, and achieves the purpose of optimization.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U463.2

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