Optimal Operation of a Hybrid Hydraulic Electric Architecture (HHEA) for Off-Road Vehicles Over Discrete Operating Decisions

J. Siefert, Perry Y. Li
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引用次数: 5

Abstract

Most off-highway construction and agriculture equipment use hydraulics, which has unmatched power density, for power transmission and throttling as a means for control. Trends towards better efficiency and electrification motivated a novel Hybrid Hydraulic-Electric Architecture (HHEA) which could significantly reduce energy consumption even in high power machines that would be too costly to electrify directly. This is achieved by using a set of common pressure rails to transmit the majority of power hydraulically and modulating the power with small electric motor-drives to achieve precise control. This paper proposes a computationally efficient, Lagrange multiplier method for computing the optimal sequence of pressure rail selections to minimize energy use. This is needed to evaluate HHEA’s energy saving potential and for iterative architecture design and sizing. An interesting complication is that the cost function is not fully defined until the candidate control sequence is fully specified. This issue is dealt with by decomposing the original problem into a set of subproblems with inequality constraints that can be solved efficiently. A case study of an off-road construction machine demonstrates that the HHEA reduces energy consumption by 2/3 compared to the baseline load sensing architecture.
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基于离散操作决策的越野车混合动力系统的最优运行
大多数非公路建筑和农业设备使用液压,它具有无与伦比的功率密度,用于动力传输和节流作为控制手段。提高效率和电气化的趋势推动了一种新型的混合动力液压-电动结构(HHEA)的发展,这种结构可以显著降低能耗,即使是在高功率机器上,这种机器的成本太高,无法直接电气化。这是通过使用一组通用压力导轨来液压传输大部分动力,并通过小型电动机驱动器调节功率来实现精确控制。本文提出了一种计算效率高的拉格朗日乘数法,用于计算压力轨选择的最优顺序,以最小化能源消耗。这需要评估HHEA的节能潜力,以及迭代的建筑设计和规模。一个有趣的复杂情况是,在候选控制序列完全指定之前,成本函数没有完全定义。这个问题是通过将原问题分解为一组具有不等式约束的子问题来解决的,这些子问题可以有效地求解。一个非公路施工机械的案例研究表明,与基线负载敏感结构相比,HHEA减少了2/3的能耗。
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