Experimental evaluation of power losses in a power-shift agricultural tractor transmission

Molari, Giovanni; Sedoni, E.

doi:10.1016/j.biosystemseng.2008.03.002

Cited by 52 publications

(27 citation statements)

References 1 publication

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“…Farm machinery manufacturers have recently tried to introduce into hydraulic systems new plant-or synthetic-based fluids and oils that are more environmentally friendly, decomposable and less damaging to water resources (Molari and Sedoni, 2008). The main requirement of the laboratory testing device was to simulate a real hydraulic circuit of a farm tractor as closely as possible.…”

Section: Resultsmentioning

confidence: 99%

Design and Modeling of an Experimental Hydraulic Device

Tkáč

Halenár

Kosiba

2018

Multidisciplinary Aspects of Production Engineering

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The design of the experimental laboratory device is based on the construction of the hydraulic circuits of mobile devices. It is possible to ensure the repeatability of the flow characteristic measurements at the laboratory. This means that in the operating test it is possible to verify the flow characteristics of the hydraulic pump and these results are not affected by the change in the physical properties of the applied liquid. By comparing of the flow characteristics directly on the work equipment (mini-excavator, etc.), the disadvantage is the need for dismantling the hydraulic pump and its mounting on the laboratory device. In some working device removal is not possible, where dismantling is structurally difficult or is time consuming, which increases the cost of their operation.The proposed experimental laboratory device serves to verify the flow characteristics of the hydraulic pump and is also designed to be universal, to test external gear hydraulic pump and hydraulic pump with inclined plate.

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Section: Resultsmentioning

confidence: 99%

Design and Modeling of an Experimental Hydraulic Device

Tkáč

Halenár

Kosiba

2018

Multidisciplinary Aspects of Production Engineering

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“…h is the reducing gear efficiency; 13 h , 23 h are efficiencies within gear-tooth systems of sun-satellite gear epicycle-satellite gear in terms of stopped carrier determining moment losses; Q is the coefficient of loss recording within gear-tooth systems ( 0 Q = is without loss consideration, 1 Q =is loss consideration within gear-tooth systems); nm N is the power transmitted by HMST links; 1 2 , e e are parameters of HSD hydraulic machines control; 1 2 , q q are the maximum capacities of hydraulic machines; The distribution of kinematic parameters, power parameters, and energy parameters of HMST in the braking process depends strongly on the following: -Transmission type; -Initial velocity (the diesel locomotive braking process starts from the velocities of max V and max 0,5×V ; in terms of HMST #2, max V within the transport range is 17.96 km/h and within traction range it is 10.55 km/h); -Drawbar force (as a rule, in terms of movement within the transport range, mine cars are empty, their maximum number is n for the selected operating conditions, which is equivalent to 2 loaded mine cars (it is assumed with ample); in terms of traction range, two loading variants are considered: 8 or 2 loaded mine cars); -Ascending and descending angle (being equivalent to 50 ‰) -Method of braking process.…”

Section: Development Of a Simulation Modelmentioning

confidence: 99%

Analysis of Hydrostatic Mechanical Transmission Efficiency in the Process of Wheeled Vehicle Braking

Таран¹,

Klymenko²

2018

Transport Problems

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To analyze the braking process of a mine diesel locomotive with hydrostatic-mechanical transmission (HSMT), a mathematical model has been developed. In contrast to available models, this one takes into consideration rules of changes in controlling the parameters of hydrostatic drive (HSD) and implementation methods for the braking process. Moreover, the model makes it possible to study changes in kinematic parameters, power parameters, and energy parameters of HSMT under various conditions of a mine diesel locomotive operation. It has been determined that the use of HSMT operating according to the "output differential" scheme is possible, providing kinematic disconnection of the engine from the driving wheels (for emergency braking with complete stop of the diesel locomotive) or at the expense of HSD while preserving the kinematic connection between the engine and the wheels (for deceleration). Use of the braking system together with HSD or the braking system only while preserving the kinematic connection between the engine and the wheels will result in HSMT failure.

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“…In addition, the information of tractor's total speed ratio of engine to rear drive axle (overall drivetrain) of each gear is presented in Figure 4. Based on a power-shift transmission proposed by New Holland [23], the transmission ratio parameters of a full power-shift transmission which has twenty forward gears are designed in this paper. The power-shift transmission allows the power to be transmitted continually by phasing the operation of the hydraulically actuated clutch packs into each other.…”

Section: Powertrain Modelmentioning

confidence: 99%

Research on Economic Comprehensive Control Strategies of Tractor-Planter Combinations in Planting, Including Gear-Shift and Cruise Control

Sun

et al. 2018

Energies

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An automatic control strategy for forward speed in the planting process is proposed to improve the fuel economy and reduce the labor intensity of drivers. Models of tractors with power-shift transmission (PST) and a precise pneumatic planter with an electric-driven seed metering device are built as research objects and simulated using Matlab with Simulink. The economic comprehensive control strategies for forward speed, including gear-shift schedule and cruise control strategy, are developed. Four levels control mode with different fuel economy performances are implemented to meet different driver or operation condition requirements. In addition, the control strategy is developed for the seed-metering device motor to maintain the required seed spacing in planting. Finally, the fuel economy and effectiveness of the control strategies for forward speed and planting quality are verified by simulations with Matlab/Simulink and Matlab/Stateflow. The simulation results verify the satisfactory performance of the proposed control strategies. The error of seed spacing is less than 3% when planting with speed fluctuation. Under the premise of ensuring planting quality and driver's demands, the cruise control strategies for forward speed have more significant effects on the fuel economy than previous cruise control strategies. Furthermore, the control mode with higher level has better fuel economy and a larger speed deviation range.

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Experimental evaluation of power losses in a power-shift agricultural tractor transmission

Cited by 52 publications

References 1 publication

Design and Modeling of an Experimental Hydraulic Device

Design and Modeling of an Experimental Hydraulic Device

Analysis of Hydrostatic Mechanical Transmission Efficiency in the Process of Wheeled Vehicle Braking

Research on Economic Comprehensive Control Strategies of Tractor-Planter Combinations in Planting, Including Gear-Shift and Cruise Control

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