Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines

L. Viktor Larsson, Liselott Ericson, Karl Uebel and Petter Krus
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L. Viktor Larsson: Department of Management and Engineering, Linköping University, 581 83 Linköping, Sweden
Liselott Ericson: Department of Management and Engineering, Linköping University, 581 83 Linköping, Sweden
Karl Uebel: Driveline Systems, Volvo Construction Equipment, 631 85 Eskilstuna, Sweden
Petter Krus: Department of Management and Engineering, Linköping University, 581 83 Linköping, Sweden

Energies, 2019, vol. 12, issue 9, 1-20

Abstract: Fuel efficiency has become an increasingly important property of heavy mobile working machines. As a result, Hybrid Hydromechanical Transmissions (HMTs) are often considered for the propulsion of these vehicles. The introduction of hybrid HMTs does, however, come with a number of control-related challenges. To date, a great focus in the literature has been on high-level control aspects, concerning optimal utilization of the energy storage medium. In contrast, the main topic of this article is low-level control, with the focus on dynamic response and the ability to realize requested power flows accurately. A static decoupled Multiple-Input-Multiple-Output (MIMO) control strategy, based on a linear model of a general hybrid HMT, is proposed. The strategy is compared to a baseline approach in Hardware-In-the-Loop (HWIL) simulations of a reference wheel loader for two drive cycles. It was found that an important benefit of the decoupled control approach is that the static error caused by the system’s cross-couplings is minimized without introducing integrating elements. This feature, combined with the strategy’s general nature, motivates its use for multiple-mode transmissions in which the transmission configuration changes between the modes.

Keywords: hydromechanical transmissions; hybridization; control; construction machinery; decoupled control; hardware-in-the-loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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