Hardware-in-the-Loop Testing of a Novel Blended Hydraulic Hybrid Transmission

Sprengel, Michael; Ivantysynova, Monika

doi:10.1115/fpni2014-7832

Cited by 9 publications

(12 citation statements)

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“…One is that the big design space leads to many concepts as candidates for evaluation, and building a prototype for each one is both expensive and time-consuming. Another reason is that it allows testing of high degrees of control with high repeatability without the need for an actual vehicle [9].…”

Section: Secondary Control In Hybrid Hmtsmentioning

confidence: 99%

“…This aims to improve the reliability of the results while maintaining the versatility and relatively cheap process of software simulations [8]. A benefit specific to transmissions is that a real vehicle is not necessary, which facilitates the testing procedure [9]. HWIL simulations have been used successfully for control evaluation of both hybrid [10] and non-hybrid [11] HMTs.…”

Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

“…Sprengel et al [9] use bond graph analogies to explain that for a rotating shaft, either the torque or the angular velocity should be controlled by the simulation while the other variable should be a consequence of the hardware. For example, a non-hybrid HST has a dominating speed-coupling between its input and output shafts due to the closed circuit.…”

Section: Secondary Control In Hybrid Hmtsmentioning

confidence: 99%

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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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Section: Secondary Control In Hybrid Hmtsmentioning

confidence: 99%

Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

Section: Secondary Control In Hybrid Hmtsmentioning

confidence: 99%

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

Larsson¹

2017

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“…For powersplit and hybrid concepts, however, four-quadrant operation is required for the load side. This can be accomplished with two-mode control of an electric motor/generator, as in [85,86]. In [87], the engine and load side are instead emulated with secondary controlled pumps/motors to enable four quadrant Conceptual Design Process operation.…”

Section: Hardware-in-the-loopmentioning

confidence: 99%

“…A different approach is done in [88], where the load speed, instead of torque, is controlled. In [85] it is argued that the load simulator needs to be adapted to the causality of the test object, e.g. using load speed control when testing a secondary controlled hybrid transmission.…”

Section: Hardware-in-the-loopmentioning

confidence: 99%

Conceptual Design of Complex Hydromechanical Transmissions

Uebel¹

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This thesis explores the conceptual design process of complex hydromechanical transmissions for mobile working machines. Efficient methods for design optimisation and controller development are presented to support the final concept selection.In the endeavour to develop new fuel-efficient driveline solutions for construction machines and off-road equipment new complex hydromechanical transmission concepts are being investigated. This pursuit is driven by stricter emission legislation, high fuel prices and a desire for a greener image both for customers and manufacturers. 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 architectures. By introducing a secondary energy storage in the machine the design space expands further for both hardware and software. There is accordingly a need for more reliable concept assessment in early design stages and the possibility to support concurrent engineering throughout the development process.Previous research on the design and development of hydromechanical transmissions has been limited to analysis of fixed concept designs or design optimisation using very simple performance indicators. Existing methodologies for electrified on-road vehicles are not suitable for off-road working machines with hydromechanical transmissions and hydraulic energy storage.The proposed conceptual design process uses detailed quasi-static simulation models and targets to optimise the fuel efficiency of the specific machine specifications and operations. It is also shown how high-speed dynamic simulations can be used for controller development and hardware-in-the-loop simulations to support an efficient product design process. The methods are demonstrated for typical use cases targeting new transmission development for construction machines. Software control development is also treated using control optimisation and real-time simulation. Finally a novel hybrid hydromechanical motion system is presented for which an efficient design process is crucial to its end performance. i ii Populärvetenskaplig SammanfattningI denna avhandling presenteras nya metoder för utveckling av energieffektiva transmissioner för tunga arbetsfordon och entreprenadmaskiner. Genom att kombinera numerisk optimering av hårdvara och mjukvara tillsammans med detaljerade simuleringar av maskinens bränsleförbrukning kan designprocessen göras mer effektiv.Idag finns det en trend mot utveckling av nya energieffektiva hydraulmekaniska transmissioner och hybridisering av mobila arbetsfordon som exempelvis hjullastare, skogsmaskiner och jordbrukstraktorer. Motiven är bland annat höga bränslekostnader, hårdare lagstiftning på utsläpp och företagens önskan om en grönare profil. En hydraulmekanisk transmission kombinerar hydraulisk och mekanisk effektöverföring och har kontinuerligt varierbar utväxling som möjliggör en effektivare framdrivn...

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Implementation of a Novel Hydraulic Hybrid Powertrain in a Sports Utility Vehicle

et al. 2015

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Hydraulic hybrid transmissions offer an efficient and high performance alternative to electric hybrid transmission in on-road vehicles. One of the principle benefits of hydraulic over electric hybrids is the higher power density offered by their energy storage media. This enables hydraulic hybrids to capture virtually all of the available kinetic energy from braking. In contrast electric hybrids are often forced to dissipate part of this energy through friction brakes due to the lower power density inherent in their energy storage media. To date various hydraulic hybrid architectures have been investigated and put into production. However as is typically true there always exists room for improvement. This paper details the integration of a novel blended hydraulic hybrid transmission with improved performance and efficiency into a demonstration vehicle. Also included is a discussion of various unique control strategies which were designed for this powertrain as well as a discussion of initial measurement.

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Hardware-in-the-Loop Testing of a Novel Blended Hydraulic Hybrid Transmission

Cited by 9 publications

References 0 publications

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

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

Conceptual Design of Complex Hydromechanical Transmissions

Implementation of a Novel Hydraulic Hybrid Powertrain in a Sports Utility Vehicle

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