arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.02180math.OC
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高效动力传动系设计--混合规划几何规划方法

Efficient Powertrain Design -- A Mixed-Integer Geometric Programming Approach

Philipp Leise, Peter F. Pelz

摘要:

电池电动车辆的动力系统可以被优化以针对牵引电池中的给定量的存储能量最大化行驶距离。为了实现这一点,一个组合的控制和设计问题,必须解决的结果在一个非凸的混合非线性规划。为了更有效地解决这个设计任务,我们提出了一个新的系统优化方法,导致凸混合非线性规划。求解过程基于几何规划和Benders分解的组合。这种方法的好处是快速的解决方案的时间,一个整体收敛,并在最优设计点,而没有额外的成本,因为它们是通过解决一个对偶问题的优化过程中计算的能力,以获得局部灵敏度。所提出的方法是适合于一个完整的驾驶循环的评价,因为这是通常在动力系统设计,或用于在随机方法,其中多个场景是从一个给定的密度函数采样使用。后者是有用的,考虑到驾驶行为的不确定性,以生成对于多种车辆和驾驶条件在平均意义上是最优的解决方案。对于动力系统模型,我们使用具有多达两个可选传动比的传动模型和基于缩放效率图表示的电动机模型。此外,所示的模型还可以用于对无级变速器进行建模,以显示基于该附加自由度的有益的能量节省。所提出的设计方法也适用于各种各样的设计任务的技术系统,除了所示的用例。

英文摘要:

The powertrain of battery electric vehicles can be optimized to maximize the travel distance for a given amount of stored energy in the traction battery. To achieve this, a combined control and design problem has to be solved which results in a non-convex Mixed-Integer Nonlinear Program. To solve this design task more efficiently, we present a new systematic optimization approach that leads to a convex Mixed-Integer Nonlinear Program. The solution process is based on a combination of Geometric Programming and a Benders decomposition. The benefits of this approach are a fast solution time, a global convergence, and the ability to derive local sensitivities in the optimal design point with no extra cost, as they are computed in the optimization procedure by solving a dual problem. The presented approach is suitable for the evaluation of a complete driving cycle, as this is commonly done in powertrain system design, or for usage in a stochastic approach, where multiple scenarios are sampled from a given probability density function. The latter is useful, to account for the uncertainty in the driving behavior to generate solutions that are optimal in an average sense for a high variety of vehicles and drive conditions. For the powertrain model we use a transmission model with up to two selectable transmission ratios and an electric motor model that is based on a scaled efficiency map representation. Furthermore, the shown model can also be used to model a continuously variable transmission to show beneficial energy savings based on this additional degree of freedom. The presented design approach is also applicable to a wide variety of design tasks for technical systems besides the shown use case.

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