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  • 1.
    Achten, Peter A J
    et al.
    Innas BV, Netherlands.
    Vael, Georges E M
    Innas BV, Netherlands.
    Heybroek, Kim
    Volvo Constrúction Equipment, Sweden.
    Efficient hydraulic pumps , motors and transformers for hydraulic hybrid systems in mobile machinery2011In: Wissensforum VDI: VDI-Fachkonferenz Getriebe in Mobilen Arbeitsmaschinen, 2011Conference paper (Refereed)
    Abstract [en]

    A detailed simulation of a large 33 metric ton wheel loader, carrying out the short loading cycle, has been performed. Two systems have been compared and examined side by side: • The conventional system, having a mechanical transmission for driving the wheels and a conventional load sensing hydraulic circuit for the work and steering cylinders. • A new hydraulic hybrid system for the wheel drive and the implements, applying new and efficient hydrau- lic pumps and motors. The core of the new system is the hydraulic transformers which convert and control all the hydraulic power flows inside the loader. The new system results in a reduction of the fuel consumption of about 50% in the analyzed cycle. The new transmission and hydraulic system also results in a strong reduction of the cooler demands.

  • 2.
    Heybroek, Kim
    Volvo Construction Equipment, Sweden.
    Hydrauliska transformatorer i hjullastare2012In: Hydraulikdagarna, 2012, p. 17-18Conference paper (Refereed)
  • 3.
    Heybroek, Kim
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    The Potential of Energy Recuperation in Valve Controlled Mobile Hydraulic Systems2009Conference paper (Other academic)
    Abstract [en]

    In this study the individual metering valve technology is put forward as a suitable base for a complementary energy recuperation system (ERS). The meter-out port of such a valve arrangement interconnects to the ERS that consists of a rotary hydraulic machine controlling the port pressure. The emphasis is on reducing the losses in overrunning load conditions and parallel actuation of multiple loads. In such load cases, the pressure drop across the valve is relocated to the hydraulic machine within the ERS. The ERS is controlled with the objective of reducing the throttling losses without sacrificing the advantageous dynamic characteristics of a valve controlled system. This article addresses relevant control strategies and presents methods to evaluate different types of ERS with regard to energy efficiency.

  • 4.
    Heybroek, Kim
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Larsson, Jonas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Open Circuit Solution for Pump Controlled Actuators2006In: 4th FPNI - PhD Symposium Sarasota 2006, Sarasota: Coastal Printing , 2006, Vol. 1, p. 27-40Conference paper (Refereed)
    Abstract [en]

    Mobile machines of today often contain hydraulic valve controlled actuator loads in an open loop circuit. For the purpose of saving energy, the constant pressure pumps have in the past often been replaced by load sensing pumps and valves. In mobile applications, they have significantly reduced the energy consumption. Stricter environmental demands and rapidly increased fuel cost require an even lower consumption. By analyzing a typical working cycle of a construction machine, the possibility of energy recovery has been identified. The analyse confirms the importance of minimizing the metering losses. In a load-sensing valve solution these losses arise as a result of the unequal drive pressure levels. By adopting a displacement controlled regenerative solution, a significantly higher level of efficiancy can be obtained. 

  • 5.
    Heybroek, Kim
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Norlin, Erik
    Volvo Construction Equipment.
    Hydraulic Multi-Chamber Cylinders in Construction Machinery2015Conference paper (Other academic)
  • 6.
    Heybroek, Kim
    et al.
    Emerging Technologies, Volvo Construction Equipment, Eskilstuna, Sweden.
    Norlin, Erik
    Emerging Technologies, Volvo Construction Equipment, Eskilstuna, Sweden.
    Hydraulic Multi-Chamber Cylinders in Construction Machinery2015In: Hydraulikdagarna 2015, 2015Conference paper (Other academic)
    Abstract [en]

    In mobile hydraulics double acting, two chamber, asymmetrical hydraulic cylinders are commonly used for linear motion control. This paper shows how a cylinder instead using four chambers can improve fuel efficiency in construction machinery. In addition to this special multi-chamber cylinder the hydraulic systems presented in this study involves the use of discretely controlled on/off valves, hydraulic accumulators and secondary controlled hydraulic motors. The proposed system solution supports potential and kinetic energy recovery and storage using hydraulic accumulators. Through proper sizing of compon- ents and sophisticated control of simple on/off valves an energy efficient, flexible and robust system is achieved. This paper outlines the basics behind this concept and provides some examples as to how the technology can be useful with an ambition to reach new levels of energy efficiency in construction machines.

  • 7.
    Heybroek, Kim
    et al.
    Volvo Construction Equipment, Sweden.
    Vael, Georges E M
    Innas BV, Netherlands.
    Palmberg, Jan-Ove
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Towards Resistance-free Hydraulics in Construction Machinery2012In: 8th International Fluid Power Conference, Dresden: Dresdner Verein zur Förderung der Fluidtechnik , 2012, Vol. 2, p. 123-138Conference paper (Refereed)
    Abstract [en]

    The topic of resistance-free motion control refers to solutions that minimize or completely eliminate the need for proportional valves, hence avoiding the throttling losses associated with metering. Previous research by the authors shows how a secondary control system could be used to improve energy efficiency in construction machines. The proposed solution uses hydraulic transformers, powered by a common pressure rail system driving both the linear work implements and the rotary drives of a propulsion system in a wheel loader. An emphasis in this paper is on the sizing aspects of transformer-based system design. The solution under special observation enables the use of smaller transformers utilizing the differential cylinder as a two-stage gearbox by means of “short-circuiting” its two cylinder chambers. The results and outlook from this study touch on how state-of-the-art secondary control systems could improve the energy efficiency of future construction machinery and suggest potential areas of improvement.

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