A novel hydromechanical hybrid motion system for construction machines

Pettersson, Karl; Heybroek, Kim; Mattsson, Per; Krus, Petter

doi:10.1080/14399776.2016.1210423

Cited by 20 publications

(18 citation statements)

References 5 publications

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“…In this context, a commonly-addressed challenge concerns the optimal use of the added power source; continuously during vehicle operation, a proper decision is required whether the accumulator should be charged or discharged [2]. The maker of this decision is commonly referred to as a high-level control strategy and has been investigated for both on-road vehicles [3,4] and mobile working machines in the past [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…First, the pressure is not constant but varies (slowly) with the accumulator's state-of-charge. This means that the output torque and power are limited if the state-of-charge is low, which complicates the high-level control [37]. Varying pressure also means that secondary control relies on pressure control as the accumulator has minimum and maximum allowed pressure levels.…”

Section: Secondary Control In Hybrid Hmtsmentioning

confidence: 99%

“…For a fully hybridised vehicle, including the working hydraulics, energy savings of up to 50% for the short loading cycle can be expected [36]. Also, power-split hybrid HMTs may utilise the complex power flows of the power-split configuration to handle energy management in both transmission and working hydraulics in an efficient manner [37].…”

Section: Hybrid Configurationsmentioning

confidence: 99%

Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Larsson¹

2017

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This thesis deals with control aspects of complex hydromechanical transmissions. The overall purpose is to increase the knowledge of important aspects to consider during the development of hydromechanical transmissions to ensure transmission functionality. These include ways of evaluating control strategies in early design stages as well as dynamic properties and control aspects of displacement controllers, which are key components in these systems.Fuel prices and environmental concerns are factors that drive research on propulsion in heavy construction machinery. Hydromechanical transmissions are strong competitors to conventional torque-converter transmissions used in this application today. They offer high efficiency and wide speed/torque conversion ranges, and may easily be converted to hybrids that allow further fuel savings through energy recuperation. One challenge with hydromechanical transmissions is that they offer many different configurations, which in turn makes it important to enable evaluation of control aspects in early design stages. In this thesis, hardware-in-the-loop simulations, which blend hardware tests and standard software-based simulations, are considered to be a suitable method. A multiple-mode transmission applied to a mid-sized construction machine is modelled and evaluated in offline simulations as well as in hardware-in-the-loop simulations.Hydromechanical transmissions rely on efficient variable pumps/motors with fast, accurate displacement controllers. This thesis studies the dynamic behaviour of the displacement controller in swash-plate axial-piston pumps/motors. A novel control approach in which the displacement is measured with an external sensor is proposed. Performance and limitations of the approach are tested in simulations and in experiments. The experiments showed a significantly improved performance with a controller that is slightly more advanced than a standard proportional controller. The implementation of the controller allows simple tuning and good predictability of the displacement response.

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“…It is known [17,18] that HMT designs have a tendency to re duce the number of frictional multidisk clutches, braking mecha nisms, the number of subranges and complicated mechanical parts. Moreover, it has not been determined yet what HMT schemes are expedient: either "input differential" or "output dif ferential".…”

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confidence: 99%

Comparative analysis of transmissions of mine diesel locomotives with different component schemes

Самородов¹,

Таран²,

Бондаренко³

2019

NVNGU

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Purpose. To develop mathematical models and techniques to model stepless transmissions operating as a part of a diesel loco motive, to improve reliability of the results of diesel locomotive movement under actual operating conditions. Methodology. Values of kinematic parameters, power parameters, and energy parameters are identified with the help of solving a system of algebraic equations by Simulink subsystem of Matlab system. Integrated study of changes in basic transmission param eters of "input differential" and "output differential" in terms of its operation within both transport and traction ranges is necessary to determine the initial data to model braking process of a mine diesel locomotive. findings. The paper has performed comparative analysis of "input differential" and "output differential" hydrostatic me chanical transmissions (HMTs) by means of integrated study of changes in power parameters, kinematic parameters, and energy parameters of the transmissions in terms of traction and transport ranges of motion of a mine diesel locomotive. Values of these parameters are determined by means of solving the system of algebraic equations being considered as the development of a set of mathematical models and techniques to model stepless transmissions operating as a part of a mine diesel locomotive. originality. The obtained results of integrated study of changes in power, kinematic and energy parameters of "input differen tial" and "output differential" HMTs in terms of their operation within both transport and traction ranges indicate that each transmission has its own strengths and weaknesses. That is why the both HMTs will be used in future while analyzing a braking process of a mine diesel locomotive. Practical value. The developed structural transmission scheme, mathematical model explaining changes in kinematic param eters and power ones, determined kinematic, power parameters and efficiency of hydrostatic drive in future can be applied as the initial data to model a braking process of a mine diesel locomotive.

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A novel hydromechanical hybrid motion system for construction machines

Cited by 20 publications

References 5 publications

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

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

Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Comparative analysis of transmissions of mine diesel locomotives with different component schemes

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A novel hydromechanical hybrid motion system for construction machines

Cited by 20 publications

References 5 publications

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

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

Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Comparative analysis of transmissions of mine diesel ­locomotives with different component schemes

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Comparative analysis of transmissions of mine diesel locomotives with different component schemes