Shaft power measurement a major step to increase fuel efficiency

摘要

Specialised in engine power measurement on seagoing vessels, TX Marine Messsysteme GmbH is developing a new generation of the shaft power measuring system TORXmeter®. The technical parameters of the TORX-meter mkII include: 1.sampling frequencies are increased to 400 kHz (24 bit); 2.self-learning correction of tolerance in magnetic poles accuracy of 1 micron; 3.permanent sensor health check, 4.permanent plausibility check (sin cos~2 crosscheck); 5.resolution 76nm; 6.numbers of sensors - two hall and two AMR sensors in each sensor head; 7.measuring of shaft diameter accuracy 1 micron; 8.averaging by position, not by time. The contactless measuring system is based on the accurate measurement of the twist on the propeller shaft created by the engine output. The TORXmeter mkII system uses two belts with a magnetic pattern which are clamped on the shaft. Contactless sensors pick up the change in position of the magnetic field during engine operation.