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A hydraulic stored energy management system from Parker Hannifin, is being used by Ros Roca, a Spanish producer of refuse trucks, to make cuts in operating noise, fuel consumption and emissions.

Integrated into Ros Roca’s latest Cross rear-loading refuse compactors, the stored energy management system enables diesel engines to idle while rubbish is being compacted, reducing noise levels by 50 per cent and enabling vehicles to be used in the city at night and early hours of the morning.

The company wanted to reduce noise levels so that the vehicles can be used in urban and built-up areas outside of normal working hours and at times when streets are free of other traffic, to help customers reduce collection times and improve productivity.

This is a problem for most refuse collection vehicles as they need to run diesel engines at speeds of at least 1,000rpm while vehicles are stationary, to drive the hydraulically powered onboard compaction and packing systems at optimum cycle rates without the risk of stalling the engine.

As well as increasing noise levels, this also produces higher emissions and consumes more fuel.

To address this issue, Ros Roca partnered with Parker Hannifin to develop a method of powering the various hydraulic mechanisms.

The solution developed by Parker is based on its Stored Energy Management System (SEMS), where energy generated during frequent vehicle braking is captured by a hydraulic accumulator.

Stored energy is then released via a conversion and modulation unit to reduce energy to the precise output levels required by the compacting and packing mechanisms.

This is then typically integrated with computerised control, in-cab HMI and conventional ancillary hydraulic components into a system that is easy to install and use.

In addition, the accumulator can be charged using an electronically controlled pump, which is attached to a power take-off (PTO) point and normally operates while the vehicle is in motion to improve efficiency.

For Ros Roca, this has produced a low-maintenance waste-compaction and packing system that is almost silent, complying with the latest European noise regulations.

It has resulted in an average drop in fuel consumption and emissions of around five per cent.

Parker Hannifin — Parker Sales UK

With annual sales exceeding $10bn, Parker Hannifin is the world's leading manufacturer of motion and control technologies and systems, providing precision-engineered solutions for a wide variety of commercial, mobile, industrial and aerospace markets.

To meet its customers' needs in motion and control, Parker provides the broadest range of products available from any single supplier. This is supported by expertise in nine major technologies:

  • Hydraulics
  • Pneumatics
  • Electromechanical
  • Filtration
  • Process control
  • Fluid and gas handling
  • Sealing and shielding
  • Climate control
  • Aerospace

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