Bischofshofen (Austria) — Statistically speaking, accidents with wheel loaders occur most frequently when the machine operator reverses after a loading process. This reverse travel is particularly risky if people are located in the wheelloader’s operating area. In these situations, there is a huge responsibility on the machine operator. Construction machine accidents can often result in severe injuries and significant damage. To ensure maximum safety, Liebherr is therefore continuing to develop its assistance systems. A current example of this is active personnel detection at the rear which now has an integrated braking assistance function and an incident map.


Brake assistant: automatic speed reduction reduces stopping distance

Active personnel detection visually alerts the machine operator via the display screen and sounds acoustic signals if there is danger in the wheel loader’s rear area. In order to provide a specific warning of imminent injury to people, the assistance system, using smart sensors, provides specific warning of people in the rear area of the wheel loader at a greater distance than for obstructions such as walls, columns or other vehicles. This means the assistance system avoids unnecessary signals, thereby reducing the burden on the machine operator and causing fewer distractions. The moment the active personnel detection system identifies a source of danger, the brake assistant slows the wheel loader down to a standstill. The braking process is therefore initiated at an earlier stage and quicker than in the case of traditional braking since, with the brake assistant, there is no delay caused by human reaction time. This means there is an important reduction in the stopping distance which, in turn, reduces the frequency and severity of accidents. In the case of the brake assistant, the hydrostatic components of the drive train automatically reduce the speed. This means the machine operator can continue to operate the wheel loader service brake in the normal way and can do this in addition to the brake assistant.


Incident map: risk management thanks to display of danger zones

Besides the brake assistant, a second new function for the active personnel detection at the rear is the incident map. Each time the assistance system detects a danger and a warning signal is issued, the system transmits a GPS signal to LiDAT, Liebherr’s in-house transfer and location system. On the basis of this signal, and for each operator of a wheel loader with active personnel detection, Liebherr provides a Google map in LiDAT showing these GPS points. The result is an incident map displaying the risk zones and potential sources of danger on the site. The operator can use this to take measures to prevent accidents and therefore increase safety. For example, the operator might reroute footpaths, cordon off areas and alter dangerous work sequences. The head of operations can use the incident map to train employees and make them aware of risky situations.


Additional intelligent wheel loader assistance systems for increased safety

Liebherr offers several intelligent assistance systems for its mid-range and large wheel loader series. In addition to active personnel detection, these include adaptive working lighting, front space monitoring, the skyview 360° camera system, the tire-pressure monitoring system with sensor support and the new weighing device. Liebherr’s goal with the assistance systems is to increase safety and comfort and to support the machine operator. All systems have been developed by Liebherr and are therefore fully integrated in the machine control.


About Liebherr-Werk Bischofshofen GmbHLiebherr-Werk Bischofshofen GmbH (Austria) develops, produces and sells wheel loaders of the Liebherr Group. The plant in the state of Salzburg has grown steadily over the decades thanks to sustainable innovations, creative solutions and high quality standards. The wheel loader range is constantly being expanded and includes different models in four different product groups: Compact loaders, stereo loaders, all-round wheel loaders of the mid-range series and large wheel loaders, which convince with their innovative drive concepts.


About the Liebherr GroupThe Liebherr Group is a family-run technology company with a highly diversified product portfolio. The company is not only one of the largest construction equipment manufacturers in the world, but also provides high-quality and user-oriented products and services in a wide range of other areas. The Liebherr Group includes over 140 companies across all continents, employs more than 48,000 staff and in 2019 achieved combined revenues of over 11.7 billion euros. Since its foundation in 1949 in Kirchdorf an der Iller in Southern Germany, Liebherr has been pursuing the goal of achieving continuous technological innovation, and bringing industry-leading solutions to its customers.