Abstract: The fluid flow of a fluid displacement device (100) provided with an electric motor (120) may be set on the basis of a power and control unit (90). Thereto, a power circuit generally comprising an inverter (30), such as a frequency inverter, drives the electric motor (110), particularly with a driving voltage (D1). Voltage and current (A1, A2) in the electric motor (110) are sensed sensorless. Torque and rotation speed of the electric motor (110) are derived from said sensed voltage and current (A1, A2). A fluid flow of the fluid displacement device (110) is estimated in an estimator (15) based on said torque and rotation speed of the electric motor (120) and at least some fluid displacement device characteristics stored in a memory.

Abstract: A system for determining the elevation of a part of an implement, with the implement being attached to the ends of a pair of lift arms of a loader machine, includes a laser transmitter providing a reference beam of laser light. The beam may be a thin beam that is swept in a reference plane, or it may be a pair of fan shaped beams that are continuously rotated. A first beam detector is mounted on one of the pair of lift arms of the loader machine for detecting said reference beam and providing a first output. A second beam detector is mounted on the same lift arm and is spaced along the lift arm from the first beam detector for detecting the reference beam and providing a second output. A control circuit, responsive to the first beam detector and to the second beam detector, determines the elevation of the part of the implement based on the first and second outputs, and provides a projected implement elevation.

Abstract: A system for determining the elevation of a part of an implement, with the implement being attached to the ends of a pair of lift arms of a loader machine, includes a laser transmitter providing a reference beam of laser light. The beam may be a thin beam that is swept in a reference plane, or it may be a pair of fan shaped beams that are continuously rotated. A first beam detector is mounted on one of the pair of lift arms of the loader machine for detecting said reference beam and providing a first output. A second beam detector is mounted on the same lift arm and is spaced along the lift arm from the first beam detector for detecting the reference beam and providing a second output. A control circuit, responsive to the first beam detector and to the second beam detector, determines the elevation of the part of the implement based on the first and second outputs, and provides a projected implement elevation.