Optimization of hydro-mechanical power split transmissions

Macor, Alarico; Rossetti, Antonio

doi:10.1016/j.mechmachtheory.2011.07.007

Cited by 94 publications

(79 citation statements)

References 2 publications

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“…The low efficiency of the TC is the main reason for the excessive fuel losses of wheel loaders [3]. With the increasing emphasis on fuel savings and emission reduction worldwide, The hydrodynamic mechanical power split transmission (HMPST) can be a desirable choice, since in it a part of the power is transferred by the mechanical branch and the rest is transferred through the TC [5,6]. With this special architecture, the HMPST simultaneously has a higher efficiency and retains most of the advantages of a TC.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al proposed a power reflux hydrodynamic transmissions (PRHTS) applied to the wheel loader. For constructing the optimal matching between the diesel engine and the PRHTS, the design optimization for the PRHTS was conducted, which was based on The hydrodynamic mechanical power split transmission (HMPST) can be a desirable choice, since in it a part of the power is transferred by the mechanical branch and the rest is transferred through the TC [5,6]. With this special architecture, the HMPST simultaneously has a higher efficiency and retains most of the advantages of a TC.…”

Section: Introductionmentioning

confidence: 99%

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Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

et al. 2017

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Abstract:The fuel economy of wheel loaders is deeply affected by the efficiency of their propelling transmissions, however, the torque converter (TC) in existing propelling transmissions is a low-efficiency component and leads to excessive energy consumption. Accordingly, this paper replaces the TC with a hydrodynamic mechanical power split transmission (HMPST) for improving the fuel economy of wheel loader. Based on probability similarity theory, the typical operating mode for the vehicles is constructed, which is used to evaluate the energy consumption performance of the selected solutions. The four reasonable solutions, which can be initially applied to wheel loaders, are selected from among the HMPSTs using the lever diagram. Furthermore, the comparisons on efficiency and loading characteristics between these four solutions and a prototype TC are conducted. The design optimization for all the four solutions is implemented, in order to find the optimal fuel saving solution relative to the prototype TC, and only one solution with pure power split can meet the constraints. Finally, a simulation model of the wheel loader powertrain is established for validating the effectiveness of this optimal solution. The results show that the optimized solution can effectively improve the fuel economy of wheel loaders compared to the prototype TC and provides a novel substitute for current technology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

et al. 2017

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“…It is reasonable to take the effect into account since different designs will result in widely different gear ratios. A similar assumption is also made in [4,5].…”

Section: Design Automation Of Complex Hydromechanical Transmissionsmentioning

confidence: 68%

“…Other studies assume constant efficiency or even ideal spur gears to conclude behaviours and characteristics of different transmission concepts, e.g. [2,4].…”

Section: Efficiencymentioning

confidence: 99%

“…In this work, power loss models are not used; instead it is assumed that the operating range with the most recirculating power has the worst efficiency. Macor and Rosetti [4] also applied optimisation on the design of basic hydromechanical power-split concepts. The proposed design methodology uses more detailed simulation models of the components.…”

Section: Introductionmentioning

confidence: 99%

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Design Automation of Complex Hydromechanical Transmissions

Pettersson¹

2013

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This thesis proposes an automated methodology for the design of complex multiple-mode hydromechanical transmissions. High fuel prices and strict emission regulations are today drivers of the development of new fuel-efficient drive transmissions for construction machinery. Hydromechanical transmissions have high energy efficiency and a wide torque/speed conversion range. They are today strong candidates to replace the fuel-thirsty torque converters conventionally used in heavy construction machines. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of different architectures. This increases the need for reliable concept evaluation in early design stages. The design of the transmission is also strongly coupled to its energy consumption and for a fair comparison between transmission concepts optimal designs are necessary.Design automation and optimisation with detailed simulation models can support the industrial engineer in the design task and increase the available knowledge early in the design process. The proposed methodology uses simulation-based optimisation to design the transmission for a specific vehicle application. Various aspects of the transmission's characteristics may be targeted, although energy efficiency is in great focus in this work. To evaluate the energy efficiency, the transmission designs are simulated using backward-facing simulations with detailed power loss models. The methodology is applicable for designing the drive transmissions of construction machines and other mobile working vehicles such as agricultural machines, forest machines and mobile mining equipment.

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