October 25th, 2017 | PRODUCT

Enhanced Productivity with Fuel Economy Improved by 20%

— A Word from the Development Team —
Technology continues to be our biggest asset thanks to our founder's philosophy— "To conserve fuel is to serve mankind". In this article we will shed light on the mindsets of those in R&D and Yanmar product strengths.

Enhanced Productivity and an Improved Fuel Economy by 20%

Hideki Seino Development Div.
Yanmar Construction Equipment

Joined Yanmar in 1990. Has continued to work in backhoe design and R&D since joining. As the project leader, he oversaw the whole project and its progress.

Hiroshi Matsuyama Development Div.
Yanmar Construction Equipment

Joined Yanmar in 1999. Worked at the Research & Development Center in R&D for farm machine transmissions and fuel efficiency technologies relating to construction equipment. After working in the strategy division, he transferred to Yanmar Construction Equipment, where he mainly designs hydraulic systems.

Takayuki Shirouzu Development Div.
Yanmar Construction Equipment

Joined Yanmar in 2000. After working in R&D for a range of product controllers at the Research & Development Center, he moved to Yanmar Construction Equipment, where he works in controller and harness design.

Satoshi Kawakami Development Div.
Yanmar Construction Equipment

Joined Yanmar in 2014. Has continued to work in product evaluations at the Development Division since joining. In this project he worked in new evaluation standards, and establishing testing items.

An Innovative 3 Star Hydraulic System

The ViO80-1B backhoe that was released in May this year fully meets Japanese Ministry of Land, Infrastructure, Transport and Tourism fuel efficiency standards. Thanks in large part to the new ViPPS2i hydraulic system. Basic research began when the ministry was considering a fuel efficiency certification system for construction equipment, at a time when added importance was being placed on reducing emissions. Yanmar Construction Equipment teamed up with the Research & Development Center and asked themselves what fuel efficiency really was, as a starting point for this project. We wanted a fuel-efficient machine that was at least as productive as it predecessors. We went for a 2 independent pump, load sensing system, commencing product development in 2014.

The Fuel Efficient, 2 Independent Pump, LS system

This system has two major benefits. The first is oil flow rate control thanks to the LS (load sensing system). Previous hydraulic systems used to deliver maximum oil flow rate regardless of the task at hand, sending the unused oil back to the tank. To reduce the excessive flow rate we installed the LS system. "There are variances in pressure between the oil discharged from the pump and the cylinder that receives the oil. Unlike its predecessors, the ViPPS2i is equipped with an LS valve that regulates loads. It enables the amount of oil required to move the lever and the amount of oil that flows from the pump to be the same, reducing oil losses that arise from an excessive flow rate," said Takayuki who was in charge of controller development. The second major benefit was having two independent oil pumps. "With the ViPPS2i's predecessors, for operations such as traveling, turning or excavating, we couldn't combine the oil discharged from multiple pumps. It used to require an amount of oil discharge that was equivalent to the maximum pressure of the cylinder that was performing the operation. With the ViPPS2i, major cylinders use separate pumps, delivering optimum pressure for each operation," said Hiroshi. When there are two operations being performed at the same time such as an arm and a boom operation, the cylinder which is most frequently used is controlled by a separate pump, allowing for optimum pressure for both operations. These two benefits still offer the same level of productivity if not more and a 20% improvement in fuel efficiency.

Comprehensive Evaluations Led to an Optimized Hydraulic System

This model was the first backhoe with a hydraulic system like this in the 8t class and a first time for Yanmar as well. Achieving this was no easy task. In particular, evaluating the ViO80-1B's performance was a big task. "Even though we have two pumps, each pump handles multiple operations. To make sure that operability isn't compromised when performing multiple operations, flow rates needed to be optimized. Previous testing methods weren't suitable for optimizing the hydraulics, so it was a real head ache," said Satoshi who was in charge of testing. For performance, strength, durability and monitor tests we got 10 companies in Japan to test ride the ViO80-1B and 8 international customers.

Customer Evaluations were a Motivational Force

"While it was a big job, customers were extremely satisfied with the monitor. The positive feedback motivated us all the way until completion", said Hideki who oversaw development. "You won't get a better backhoe in the 8t class than this. It's a shame we can't take all the credit for it. A big thanks goes out to the Research & Development Center, sales who evaluated the monitors and other departments for their help with this project," said Hideki. The ViO80-1B is going to be a game changer, that's for sure.

Thoroughness Leads to Machine Efficiency

Equipped with an LS system, flow rates are optimized for each work load, minimizing the load on the engine. The 2 independent pumps only discharge enough oil to get the job done, leaving nothing to waste. Thorough technical calculations and customer feedback helped us deliver a machine that performs just as good as its predecessors and delivers a 20% improvement on fuel efficiency. The ViO80-1B is an industry first in the 8t class to be equipped with a hydraulic system like this.