汽车工程

汽车工程 ›› 2020, Vol. 42 ›› Issue (9): 1240-1247.doi: 10.19562/j.chinasae.qcgc.2020.09.014

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适应坡道行驶的多性能综合最优换挡规律*

卢汉1,2, 阴晓峰1, 陈柯序1, 武小花1, 梁益铭1, 刘阳1   

  1. 1.西华大学汽车工程研究所,成都 610039;
    2.攀枝花学院汽车与交通工程学院,攀枝花 617000
  • 出版日期:2020-09-25 发布日期:2020-10-19
  • 通讯作者: 阴晓峰,博士,教授,E-mail:xfyin@139.com
  • 基金资助:
    *国家自然科学基金(51375402)、四川省重点研发项目(2019YFG0367)、四川省“千人计划”创新领军人才项目和四川省汽车工程重点实验室开放课题(szjj2016-083)资助。

Multi-performance Integrated Optimal Shift Schedule for Ramp Driving

Lu Han1,2, Yin Xiaofeng1, Chen Kexu1, Wu Xiaohua1, Liang Yiming1, Liu Yang1   

  1. 1. Institute of Automotive Engineering, Xihua University, Chengdu 610039;
    2. Transportation and Automobile Engineering School, Panzhihua University, Panzhihua 617000
  • Online:2020-09-25 Published:2020-10-19

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摘要： 针对换挡规律坡道适应性问题,本文中研究了适应坡道行驶的有级自动变速汽车多性能综合最优换挡规律优化方法。首先,分析坡道对换挡的影响,提出可由不同节气门开度下各挡驱动力与不同坡度行驶阻力之间的关系确定挡位范围。其次,采用理想点与平方和线性加权法构造综合性能评价函数,以在体现驾驶员性能倾向的前提下实现整车动力性和燃油经济性综合最优。然后,以综合性能评价函数最小为优化目标并考虑坡道行驶约束条件,提出基于遗传算法的坡道行驶多性能综合最优换挡规律优化方法。运用所提出的优化方法,制定了某5挡机械式自动变速器多性能综合最优坡道换挡规律。最后,在定油门定坡道、定油门变坡道、变油门定坡道循环工况、变油门变坡道循环工况下对考虑坡道和未考虑坡道的多性能综合最优换挡规律进行仿真验证。结果表明:在4种坡道行驶条件下,多性能综合最优坡道换挡规律均可消除非预期换挡,提高乘坐舒适性。在修改后的可变坡度高速公路循环工况下,使用多性能综合最优坡道换挡规律汽车的燃油经济性仅略低于使用常规换挡规律的汽车,降幅约为0.8%。进一步完成了定坡度动力性仿真,结果表明制定的多性能综合最优坡道换挡规律能够反映驾驶者的性能需求意图。

关键词: 有级自动变速器, 换挡规律, 坡道, 多性能综合优化

Abstract: For ramp adaptation problem of shift schedule, the approach for multi-performance integrated optimal shift schedule (MPIOSS) for ramp driving of stepped automated transmission vehicle has been investigated. Firstly, the influence of ramp on shifting process is analyzed, and a method to determine the gear range according to the relation between the driving force under various throttle opening and slope resistance is put forward. Secondly, an integrated performance evaluation function is constructed by using the linear weighting method of ideal point and square sum to realize the overall optimization of vehicle power performance and fuel economy under the premise of reflecting the driver's performance expectation. Then, an optimization approach for MPIOSS for ramp driving based on genetic algorithm is proposed, which takes the integrated performance evaluation function as the optimization objective and considers the constraints of ramp driving. The proposed optimization approach is applied to formulate the MPIOSS shift schedules for a 5-speed automated manual transmission (AMT). Finally, the multi-performance integrated optimal shift schedules considering ramp and those ignoring ramp are verified via simulation under fixed throttle and fixed slope, fixed throttle and changing slope, changing throttle and fixed slope, and changing throttle and changing slope conditions. The results show that under the four kinds of ramp driving, the multi-performance integrated optimal ramp shift schedule can eliminate unexpected shift operation and improve the ride comfort. Under the modified HWFET-MTN driving cycle, the fuel economy of the vehicle with multi-performance integrated optimal ramp shift schedules is only slightly lower than that of the vehicle with conventional shift schedule, with a reduction of about 0.8%. Furthermore, power performance simulation under fixed slope shows the proposed MPIOSS for ramp driving can reflect the driver's performance demand intention

Key words: tepped automatic transmission, shift schedule, ramp, multi-performance integrated optimization