Functional Modules Energy-Efficient Excavator Controls EPC and VBO Mobile machines offer significant potential for better utilization of the energy used. In hydraulic excavators, the most commonly used construction machines, advanced hydraulic control systems offer substantial improvement in energy utilization. Learn more about energy-efficient excavator controls EPC and VBO: Background Function Advantages Applications Approaches for TIER 4 final Further information: Webcast: Energy Efficient Implement Hydraulics