The Hydraulic Power Generation and Transmission on Agricultural Tractors: feasible architectures to reduce dissipation and fuel consumption – Part 2

Casoli, Paolo; Zardin, Barbara; Ardizio, Salvatore; Borghi, Massimo; Pintore, Francesco; Mesturini, Davide

doi:10.1051/e3sconf/202019707010

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…Examples of variations of the traditional load-sensing architecture to improve its efficiency are the flow-on-demand load-sensing (FOD) proposed in [4] and the electronic loadsensing (ELS) shown in [5]. Some LS variations are investigated in [6,7] on a medium-sized agricultural tractor.…”

Section: Introductionmentioning

confidence: 99%

Multi-Point-of-View Energy Loss Analysis in a Refuse Truck Hydraulic System

et al. 2021

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In recent years, much research has focused on reducing the power consumption of mobile hydraulic machines due to rising fuel costs, regulations on combustion engine emissions and the need to reduce the size and weight of the storage devices in hybrid drives. Current approaches to improve the energy efficiency of a hydraulic system can be classified into four basic groups: reduction of the energy demand, recovery of part of the supplied energy (ERS systems), regeneration of part of the supplied energy and reuse of the recovered and regenerated energy (hybrid systems). Today’s mobile hydraulic systems are often complex, perform different tasks and work under different load conditions, which makes it difficult to analyse energy losses. A study of the energy losses of a hydraulic system from different points of view, such as an energy balance for a complete machine cycle, an analysis of the individual cycle phases and a power analysis for the different operation quadrants of the actuators, can give an global picture of the energy losses, being very useful to rate its energy efficiency, identify main power losses and decide which of the different energy-saving techniques to apply. This paper describes the data collection process, its analysis from various points of view and the summary of the results in easy to understand charts as useful tools to identify and quantify the main energy losses. Only system architecture losses are considered. Losses in the ICE engine or the electric motor, hydraulic pump losses and mechanical losses are outside the scope of this study.

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Section: Introductionmentioning

confidence: 99%

Multi-Point-of-View Energy Loss Analysis in a Refuse Truck Hydraulic System

et al. 2021

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“…Other aspects concern the optimization of power transmission [6][7][8] without neglecting the importance of the optimal match between the hydraulic system and the thermal engine [9]. Mathematical models are necessaries for evaluating different solutions, the models could be based on lumped parameters approach for the systems simulation [10][11][12][13][14][15] while when a component needs to be optimized dedicated detailed models should be developed; the literature reports research activities carried out on gear pumps [16][17][18][19][20][21]; fixed displacement gerotor pump are investigated in [22][23][24][25][26][27]. Particular applications like lubrication pump are investigated in [28][29][30]; topics concerning the condition monitoring applied to hydraulic pumps are reported in [31,32]; other papers are focused on detailed analysis of hydraulic valves [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The mathematical model of this device [13] has been added to the already developed mathematical model of a standard excavator. The mathematical model of the excavator was developed and validated as reported in [50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Excavator hydraulic circuit solution to reduce dissipations and fuel consumption

et al. 2021

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In the field of mobile machine the research is mainly focused on solutions to reduce the energy dissipations and fuel consumptions being these machines mainly equipped with Diesel engines. This paper presents a solution for improving the performance of a traditional Load sensing flow sharing circuit. The solution concerns the insertion of a Load sensing signal conditioner (LSc), developed by Walvoil S.p.A., that permits to dynamically change the pressure drop across the directional valves. A careful control of this new component permits to obtain a reduction of the fuel consumption without changing the performance of the machine taking as reference a JCMAS duty cycle. This paper presents the mathematical model of a 9 ton excavator that was previously validated with tests carried out on both the single hydraulic and the excavator main components like pump and flow sharing valves. The LSc model was developed and added to the traditional hydraulic circuit. The model of the excavator hydraulic circuit with this new component has permitted to simulate the energy saving achievable in comparison with the traditional solution. The paper presents the relevance of a carefully control of this new device in order to maximize the performance. The physical prototyping of this device has been already developed and will be installed in a mobile machine to confirm the simulated performance.

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“…The main counterpart of these systems is their effic iency, though. For this reason, in last decades, researchers of the field have focused more and more in optimizing the design ( [1,2]), reducing dissipations ( [3]), proposing new circuit's layouts ( [4,5]), improve the efficiency and performances of the single components of the systems ( [6,7,8]). Positive Displacement Machines (PDMs), wildly used in fluid power systems for mobile and industrial applications, still present many challenges related to their design.…”

Section: Introductionmentioning

confidence: 99%

Lumped parameter model of vane pumps developed in OpenModelica environment

et al. 2021

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In this paper, the authors present a 0D fluid dynamic model of a vane pump used to refill tanks with fuel. The model is entirely developed in OpenModelica environment, where the authors have created specific libraries of elements suitable for the physical modelling of fluid power components and systems. Among the different approaches, the zero-dimension (0D) fluid-dynamic modelling of positive displacement machines is suitable to study many aspects as: the instantaneous flow rate, pressure and torque transients, the fluid borne noise related to the flow rate and pressure irregularity, the dynamic behaviour of the variable displacement control. Overall, this approach in modelling allows to link the geometrical features of the machine with its dynamic behaviour and for this reason is particularly useful in guiding the design. The model of the vane pump is described together with the main design features that can be analysed in terms of their influence on the pump behaviour. Besides the specific results obtained regarding the design of the pump, the paper also demonstrates the use of OpenModelica language and environment, and its efficacy, into the applications of fluid power modelling and simulation.

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The Hydraulic Power Generation and Transmission on Agricultural Tractors: feasible architectures to reduce dissipation and fuel consumption – Part 2

Cited by 5 publications

References 26 publications

Multi-Point-of-View Energy Loss Analysis in a Refuse Truck Hydraulic System

Multi-Point-of-View Energy Loss Analysis in a Refuse Truck Hydraulic System

Excavator hydraulic circuit solution to reduce dissipations and fuel consumption

Lumped parameter model of vane pumps developed in OpenModelica environment

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