Hyundai Construction Equipment Americas, Inc. recently unveiled its R220LC-9 HI-POSS excavator prototype at CONEXPO-CON/AGG, held March 4-8, 2014 at the Las Vegas Convention Center. The concept model showcased the company’s next-generation power system.
The HI-POSS (Hyundai Intelligent Power Optimal Sharing and Energy Saving) system maximizes energy utilization through an electronically controlled pump and valve, whereas a conventional hydraulic excavator utilizes a spool-operated valve. The result is more precise and effective machine operation leading to improved fuel consumption and operability.
The system reduces energy consumption by reducing waste flow, such as relief flow, through optimal flow distribution and recycling of waste energy through an accumulator. The technology allows for more efficient swing start, swing stop, boom down and main relief flow, which is estimated to provide operators with an improved fuel consumption ratio of 20%.
The use of electronically controlled valves enables independent flow control and allows for tuning tailored to specific applications and operators without the need for installation of additional components. The HI-POSS system allows for the adjustment of the speed ratio between different attachments and matching between joystick signal and single operation speed from a computer or cluster with the appropriate software. In addition, it provides operators with self-diagnosis and easy maintenance through this same technology.
The 50,520-lb. R220LC-9 HI-POSS prototype boasts a 143-hp Cummins Tier 3 QSB6.7 engine. It has an operating weight of 50,520 lbs., a maximum dig depth of 22 ft. 1 in. and a bucket breakout force of 31,830 lbs