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Dell'Amico, Alessandro
Alternative names
Publications (10 of 16) Show all publications
Kärnell, S., Dell'Amico, A. & Ericson, L. (2018). Simulation and validation of a wobble plate pumpwith a focus on check valve dynamics. In: 2018 Global Fluid Power Society PhD Symposium (GFPS 2018): Samara, Russia 18-20 July 2018. Paper presented at 2018 Global Fluid Power Society PhD Symposium (GFPS 2018). , Article ID 15.
Open this publication in new window or tab >>Simulation and validation of a wobble plate pumpwith a focus on check valve dynamics
2018 (English)In: 2018 Global Fluid Power Society PhD Symposium (GFPS 2018): Samara, Russia 18-20 July 2018, 2018, article id 15Conference paper, Published paper (Refereed)
Abstract [en]

Digital hydraulic piston pumps that use electrically controlled on/off valves to individually control the flow from each piston is a promising technique as these pumps are highly efficient at part displacement and respond quickly. However, digital pumps can still use check valves on the inlet, a fact that makes analysing wobble plate pumps (WPP) and their check valves interesting. Here, we measured the cylinder pressures of a WPP and compared these results with results from a simulation model we developed. In addition, we used linear analysis to investigate how different design parameters affect the valve’s behaviour. From the measurements we found that the cylinder pressure is clearly affected the flow from other pistons and also that the system is not as stiff as expected. From the linear analysis, a criterion of how to design the valve to avoid instability was derived.

Keywords
wobble plate pump, digital pump, check valve, efficiency, pressure pulsations
National Category
Engineering and Technology Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-155055 (URN)10.1109/GFPS.2018.8472400 (DOI)978-1-5386-4786-8 (ISBN)978-1-5386-4785-1 (ISBN)
Conference
2018 Global Fluid Power Society PhD Symposium (GFPS 2018)
Projects
STEALTH – Sustainable Electrified Load Handling
Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11
Dell'Amico, A. & Krus, P. (2016). Modelling and experimental validation of a nonlinear proportional solenoid pressure control valve. International Journal of Fluid Power, 17(2), 90-101
Open this publication in new window or tab >>Modelling and experimental validation of a nonlinear proportional solenoid pressure control valve
2016 (English)In: International Journal of Fluid Power, ISSN 1439-9776, Vol. 17, no 2, p. 90-101Article in journal (Refereed) Published
Abstract [en]

This paper investigates the static and dynamic behaviour of a pressure control valve with nonlinear negative characteristics. The pressure control valve has both reducing and relieving capability and is actuated by a solenoid. The static characteristics have been measured over the entire working range, covering the dynamic response of the solenoid, as well as the complete valve. A model is proposed that considers the flow as a mix of laminar and turbulent flow and flow forces with a flow angle that varies with the stroke of the spool. The model shows good agreement with measurements. The investigations show that the flow forces decrease with higher flow rates as a result of a flow angle that tends to go towards a vertical angle. This results in an increase in pressure with flow during pressure reducing mode. A linear analysis is also presented, explaining this as a negative spring constant in the low frequency range. Stability is, however, maintained.

Keywords
Nonlinear modelling, solenoid, pressure control valve, linear analysis
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:liu:diva-130036 (URN)10.1080/14399776.2016.1141636 (DOI)
Available from: 2016-07-05 Created: 2016-07-05 Last updated: 2017-11-28
Dell'Amico, A. (2016). On Electrohydraulic Pressure Control for Power Steering Applications: Active Steering for Road Vehicles. (Doctoral dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>On Electrohydraulic Pressure Control for Power Steering Applications: Active Steering for Road Vehicles
2016 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

This thesis deals with the Electrohydraulic Power Steering system for road vehicles, using electronic pressure control valves. With an ever increasing demand for safer vehicles and fewer traffic accidents, steering-related active safety functions are becoming more common in modern vehicles. Future road vehicles will also evolve towards autonomous vehicles, with several safety, environmental and financial benefits. A key component in realising such solutions is active steering.

The power steering system was initially developed to ease the driver's workload by assisting in turning the wheels. This is traditionally done through a passive open-centre hydraulic system and heavy trucks must still rely on fluid power, due to the heavy work forces. Since the purpose of the original system is to control the assistive pressure, one way would be to use proportional pressure control valves. Since these are electronically controlled, active steering is possible and with closed-centre, energy efficiency can be significantly improved on.

In this work, such a system is analysed in detail with the purpose of investigating the possible use of the system for Boost curve control and position control for autonomous driving. Commercially available valves are investigated since they provide an attractive solution. A model-based approach is adopted, where simulation of the system is an important tool. Another important tool is hardware-in-the-loop simulation. A test rig of an electrohydraulic power steering system, is developed.

This work has shown how proportional pressure control valves can be used for Boost curve control and position control and what implications this has on a system level. As it turns out, the valves add a great deal of time lag and with the high gain from the Boost curve, this creates a control challenge. The problem can be handled by tuning the Boost gain, pressure response and damping and has been effectively shown through simulation and experiments. For position control, there is greater freedom to design the controller to fit the system. The pressure response can be made fast enough for this case and the time lag is much less critical.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. p. 187
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1739
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-124574 (URN)10.3384/diss.diva-124574 (DOI)978-91-7685-838-7 (ISBN)
Public defence
2016-02-26, A35, A-huset, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2016-02-04 Created: 2016-02-04 Last updated: 2016-02-10Bibliographically approved
Dell'Amico, A. & Krus, P. (2015). Modeling, Simulation, and Experimental Investigation of an Electrohydraulic Closed-Center Power Steering System. IEEE/ASME transactions on mechatronics, 20(5), 2452-2462
Open this publication in new window or tab >>Modeling, Simulation, and Experimental Investigation of an Electrohydraulic Closed-Center Power Steering System
2015 (English)In: IEEE/ASME transactions on mechatronics, ISSN 1083-4435, E-ISSN 1941-014X, Vol. 20, no 5, p. 2452-2462Article in journal (Refereed) Published
Abstract [en]

In steering-related active safety systems, active steering is a key component. Active steering refers to the possibility to control the road wheel angle or the required torque to turn the wheels by means of an electronic signal. Due to the high axle loads in heavy vehicles, hydraulic power is needed to assist the driver in turning the wheels. One solution to realize active steering is, then, to use electronically controlled valves that are of closed-center type. This means that the assistance pressure, or force, can  be set to any feasible value and still benefit from the high power density of fluid power systems. A closed-center solution also implies that a significant reduction in fuel consumption is possible. This paper investigates such an electrohydraulic power steering system, and a comparison with the original system is also made. The findings have shown that while a high response of the pressure control loop is desired for a good steering feel, instability might occur at higher steering wheel torque levels. This has effectively been shown and explained by simulation and hardware-in-the-loop simulation, together with linear analysis. For any desired boost curve, the response of the pressure control loop must be designed to preserve stability over the entire working range.

Keywords
Active steering, hardware-in-the-loop simulation, nonlinear simulation, power steering system
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-115110 (URN)10.1109/TMECH.2014.2384005 (DOI)000360831900041 ()
Available from: 2015-03-10 Created: 2015-03-09 Last updated: 2017-12-04Bibliographically approved
Dell' Amico, A., Ericson, L., Henriksen, F. & Krus, P. (2015). Modelling and experimental verification of a secondary controlled six-wheel pendulum arm forwarder. In: Roberto Paoluzzi (Ed.), the 13th European Conference of ISTVS: . Paper presented at Proceedings of the 13th ISTVS European Conference, Rome, October 21-23, 2015 (pp. 1-10).
Open this publication in new window or tab >>Modelling and experimental verification of a secondary controlled six-wheel pendulum arm forwarder
2015 (English)In: the 13th European Conference of ISTVS / [ed] Roberto Paoluzzi, 2015, p. 1-10Conference paper, Published paper (Refereed)
Abstract [en]

One of the major concerns in the forest industry is the impact on the soil caused by the forest machines duringharvesting, where damages can have a negative impact on e.g. further growth. One of the main reasons is wheel slip.Another concern is the working environment of the operator due to the harsh ground in the forest. Both these issueshave a negative impact on productivity. An attempt to overcome these challenges is made within a collaborative researchproject, which among others also includes Linköping University, where a new six-wheel pendulum arm forwarder isbeing developed. The new forwarder aims at reducing the soil damage by an even pressure distribution and smooth torquecontrol, as well as increased damping of the complete chassis, and thereby improving the working environment. This ispossible since each wheel, driven by its own hydraulic motor, is attached to a pendulum arm allowing to control the heightof each wheel independently of each other. The forwarder has a total maximum weight of 31 tonnes, including 14 tonnesmaximum load. It consists of two steerable joints and is driven by a 360 bhp diesel engine. The transmission consists oftwo hydraulic pumps and six hydraulic motors.This paper deals with the development of the driveline and presents the first experimental tests of the implementedcontrol strategies, where a secondary control approach is chosen for its ability to individually control the torque on eachwheel. The control strategies, presented in the paper, include pressure control, velocity control of the vehicle and ananti-slip controller. To support the development of the control strategies, models of the vehicle and hydraulic subsystemsare derived. The aim with this paper is to verify the concepts on the actual vehicle. The initial results are promising,indicating that the suggested concept is feasible.

Keywords
Secondary control, forest machinery, forwarder, modelling
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-122390 (URN)9781942112464 (ISBN)
Conference
Proceedings of the 13th ISTVS European Conference, Rome, October 21-23, 2015
Available from: 2015-10-30 Created: 2015-10-30 Last updated: 2017-12-20Bibliographically approved
Ericson, L., Dell' Amico, A. & Krus, P. (2015). MODELLING OF A SECONDARY CONTROLLED SIX-WHEEL PENDULUM ARM FORWARDER. In: : . Paper presented at 14th Scandinavian International Conference on Fluid Power (SICFP'15).
Open this publication in new window or tab >>MODELLING OF A SECONDARY CONTROLLED SIX-WHEEL PENDULUM ARM FORWARDER
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

One of the major concerns in the forest industry is the impact on the soil caused by the forest machines during harvesting, where damage can have a negative impact on growth at replanting for example. Another concern is the working environment of the operator. Both these issues have a negative impact on productivity. A new six-wheel pendulum arm forwarder is being developed within a collaborative research project. The new forwarder aims to reduce soil damage by means of an even pressure distribution and smooth torque control. This paper presents the first step in the development of the driveline, where a secondary control approach is chosen for its ability to control the motion of each wheel individually. Simulation models of both vehicle and driveline have been constructed developed, partly for the development of the control strategy, and partly for evaluation. A speed control concept and a torque control concept have both been evaluated for different scenarios with regard to their ability to reduce wheel slip. Results have shown that a velocity control approach is more sensitive to kinematic model accuracy while wheel slip is handled automatically. A torque control approach is more robust towards model accuracy while the reduction of slip is dependent on an accurate model.

Series
14th Scandinavian International Conference on Fluid Power (SICFP'15), ISSN 2342-2726
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-118308 (URN)978-952-15-3530-7 (ISBN)
Conference
14th Scandinavian International Conference on Fluid Power (SICFP'15)
Available from: 2015-05-26 Created: 2015-05-26 Last updated: 2017-12-20
Dell'Amico, A. & Krus, P. (2014). Closed-Centre Hydraulic Power Steering by Direct Pressure Control. In: The 9th JFPS International Symposium on Fluid Power : Matsue 2014 : Oct. 28-31, 2014: . Paper presented at The 9th Symposium on Fluid Power, Energy Saving and LCA in Smart Fluid Power System, Matsue, Japan, 28-31 October 2014 (pp. 332-339). The Japan Fluid Power System Society
Open this publication in new window or tab >>Closed-Centre Hydraulic Power Steering by Direct Pressure Control
2014 (English)In: The 9th JFPS International Symposium on Fluid Power : Matsue 2014 : Oct. 28-31, 2014, The Japan Fluid Power System Society , 2014, p. 332-339Conference paper, Published paper (Other academic)
Abstract [en]

An ongoing trend in the vehicle industry is the development of steering related active safety functions for increased road safety. For this to be a reality there must exist a steering system that allows to either change the road wheel angle or torque by means of an external signal, called active steering. Due to heavy vehicles’ high axle load, hydraulic power is needed to assist the driver in turning the wheels. This paper looks into a solution where self-regulated pressure control valves are used for electronic control of the assistance pressure in order to realise active steering. The valve has closed-centre for a high potential to reduce the energy consumption. A model based approach is used to analyse the system. A non-linear simulation environment is developed to compare the closed-centre system with the original system. A linear analysis is also performed to discover the influence of valve properties on steering system performance. Results have shown that a feasible solution exists and that there exists a relation between valve dynamics, boost gain and steering system loop stability.

Place, publisher, year, edition, pages
The Japan Fluid Power System Society, 2014
Keywords
Active steering, hydraulic power steering, pressure control, closed-centre system
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-112979 (URN)4-931070-10-8 (ISBN)
Conference
The 9th Symposium on Fluid Power, Energy Saving and LCA in Smart Fluid Power System, Matsue, Japan, 28-31 October 2014
Available from: 2015-01-07 Created: 2015-01-07 Last updated: 2016-05-17Bibliographically approved
Dell'Amico, A. & Krus, P. (2013). A Test Rig for Hydraulic Power Steering System Concept Evaluation using Hardware-in-the-Loop Simulation. In: ICFP 2013: . Paper presented at The 8th International Conference on Fluid Power Transmission and Control (ICFP 2013), 9-11 April 2013, Hangzhou, China.
Open this publication in new window or tab >>A Test Rig for Hydraulic Power Steering System Concept Evaluation using Hardware-in-the-Loop Simulation
2013 (English)In: ICFP 2013, 2013Conference paper, Published paper (Refereed)
Abstract [en]

This paper derives a test rig of a power steering system with purpose to investigate the performance of closed-centre valves as actuators in the steering system loop using hardware-in-the-loop simulation. Servo valves are used for independent control of each chamber pressure. The approach is to use a static model of the reference actuator and control the pressures with the servo valves accordingly. A simulation model of the system is used to verify the approach. Results from the test rig are presented from on-centre driving which show how the pressure is controlled satisfyingly.

Keywords
Hydraulic power steering, hardware-in-the-loop, pressure control
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-93846 (URN)978-7-89460-153-7 (ISBN)
Conference
The 8th International Conference on Fluid Power Transmission and Control (ICFP 2013), 9-11 April 2013, Hangzhou, China
Available from: 2013-06-11 Created: 2013-06-11 Last updated: 2013-06-17
Dell'Amico, A., Carlsson, M., Norlin, E. & Sethson, M. (2013). Investigation of a Digital Hydraulic Actuation System on an Excavator Arm. In: 13th Scandinavian International Conference on Fluid Power: . Paper presented at 13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden (pp. 505-511). Linköping University Electronic Press
Open this publication in new window or tab >>Investigation of a Digital Hydraulic Actuation System on an Excavator Arm
2013 (English)In: 13th Scandinavian International Conference on Fluid Power, Linköping University Electronic Press, 2013, p. 505-511Conference paper, Published paper (Refereed)
Abstract [en]

Digital hydraulics is an ongoing trend that offers many interesting advantages and possibilities. Digital refers to that the system output is discrete, e.g. using an on/off valve with only discrete values or a finite amount of flow steps available. The advantages mentioned when compared to analogue systems are better performance, robust and fault tolerant, and amplitude independent bandwidth. On the other side noise and pressure pulsations must be handled, the physical size can be a problem, and the system requires complicated control. When considering control of linear motion, there are mainly two branches, controlling the flow with several parallel connected on/off valves, which generates discrete output flow values, or switching valves, which in theory can generate any mean output flow. The latter only requires one valve for each flow path but the demand for fast valves is very high, while the former requires many valves but avoids high frequent switching. With the introduction of a multi-chamber cylinder, secondary control is now also possible for linear motion. This paper is a first step in the investigation of the system applied to an excavator arm. The cylinder has four chambers, each with different area. Three pressure lines are used and a valve-pack of 27 on/off valves. The valve-pack connects the three pressure lines with each chamber generating 81 available force steps. The scope has been to start out with relative simple control of the velocity of the cylinder. To handle unnecessary switching of valves, different penalty strategies were tested. The results are promising where relatively smooth control could be achieved at the same time challenges with the system were identified. Next step is to investigate the force transients due to different capacitance in all four chambers as well as mode control for better accuracy. Energy potential compared to original system remains to investigate as well.

Place, publisher, year, edition, pages
Linköping University Electronic Press, 2013
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 92
Keywords
Digital hydraulics, secondary control, excavator, on/off-valves
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-102190 (URN)10.3384/ecp1392a50 (DOI)978-91-7519-572-8 (ISBN)
Conference
13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden
Available from: 2013-12-02 Created: 2013-12-02 Last updated: 2018-01-25Bibliographically approved
Dell’Amico, A. (2013). Pressure Control in Hydraulic Power Steering Systems. (Licentiate dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Pressure Control in Hydraulic Power Steering Systems
2013 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

There is a clear trend in the vehicle industry to implement more safetyrelated functions, where the focus is on active safety systems and today the steering system is also involved. Steering-related active safety functions can only be realised with a steering system that allows electroniccontrol of either the road wheel angle or the torque required to steer the vehicle, called active steering. The high power requirement of heavy vehicles means they must rely on hydraulic power to assist the driver. Thesystem is a pure hydro-mechanical system with an open-centre circuit activated by the driver’s steering action and suffers from poor energy efficiency. The main task of the hydraulic system is to control the pressure in the assistance cylinder in such a way that it eases the load on the driver.

This work suggests a way to design and evaluate a self-regulating pressure control valve for use as actuator in the steering system. This valve can be made small and fast and is electronically controlled to enable active steering. It is based on a closed-centre circuit and has therefore the potential to improve energy efficiency. The aim of this work has been to investigate the possibility for the valve to perform as the  original open-centre valve. The suggested approach is a model-based design and evaluation process where an optimisation routine is used to design the valve. Together with a validated model of the steering system, the new concept is compared with the original system. A hardware-inthe-loop simulation test rig has also been designed and built with the possibility to test a closed-centre steering system. It has partly been used to support the modelling process and partly to verify that a closedcentre steering system is a feasible solution. The simulation results  have shown that the designed valve can perform sufficiently well compared to the original system.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. p. 91
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1626
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-100841 (URN)10.3384/lic.diva-100841 (DOI)LIU-TEK-LIC-2013:60 (Local ID)978-91-7519-476-9 (ISBN)LIU-TEK-LIC-2013:60 (Archive number)LIU-TEK-LIC-2013:60 (OAI)
Presentation
2013-11-29, A30, Hus A, Campus Valla, Linköpings universitet, 10:15 (English)
Opponent
Supervisors
Available from: 2013-11-13 Created: 2013-11-13 Last updated: 2013-11-18Bibliographically approved
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