Transense Technologies, Plc

Mark Lee

Raymond David Lohr

Victor Alexandrovich Kalinin

David Daniel George Vile

Arthur John Leigh

Paul Joseph Howse

A method is provided for measuring torque in a shaft of a drive line including a disc coupling component such as a flexplateor a flanged coupling, as well as a drive coupling system for carrying out the method. The disc coupling componentis connected between a drive inputand a drive output so that all torque transmitted between the input and output passes through said component. The disc coupling componenthas a radially extending portion, which may include a plurality of spokes, to which is attached a SAW based strain sensor which communicates with a stationary couplerfastened to an engine blockfor wireless transmission of data from the sensor, the strain sensor measuring the strain in the disc coupling componentfrom which the torque carried in the input shaftmay be calculated.

Torque measurement within a powertrain

A device for measuring torsional distortion of a body comprises first and second clip portions each having a central part and two legs depending from the central part, each leg having adjacent the free end thereof a groove or projection for engaging a respective projection or groove () provided in the body () to mount the clip portion the body rotationally fastened therewith. A bridge interconnects the clip portion. The bridge is less stiff than the clip portions whereby relative rotational displacement of the clip portions caused by torsional distortion of the body will cause proportional deflection of the bridge. Means, for example a SAW device (), are provided for measuring the deflection of the bridge to provide an indication of the torsional distortion which produces the deflection of the bridge. Also () for the interior all of a hollow body.

Measuring torsional distortion with an easily applied clip device (saw)

A surface acoustic wave (SAW) sensor includes a transducer (provided on a substrate (), wherein the transducer () is oriented on the substrate () so that the direction of acoustic wave propagation is such that the variation of sensor output with temperature, associated with the variation of the substrate third-elastic constants with temperature, substantially equal but opposite to the sum total of the variation of sensor output with temperature associated with the substrate linear temperature coefficient of expansion and with the variations with temperature of the substrate non-zero third order elastic constants, the substrate first-order elastic constants and the substrate density. The effect of temperature variation on sensor output is thereby minimized. This is achieved with a 35-degree arrangement or with reflective gratings inclined at an angle of 3.1 degrees to normal. Additionally, a robust package with a dish is given. Particular applications include the measurement of torque.

Temperatures stable saw sensor with third-order elastic constants

A pressure monitor has a base and a lid secured to the base to define a substantially fluid tight chamber. At least part of the lid is flexible and forms a diaphragm which deflects responsive to changes in fluid pressure surrounding the monitor. A projection provided on the diaphragm transmits movement thereof to a distortable substrate located within the chamber. A first SAW device is mounted on the distortable substrate, and at least a second and third SAW device are mounted within the chamber. The second SAW device carried on a reference substrate section has its direction of propagation inclined at an angle to the direction of propagation of at least one of the first and third SAW devices. This way movement of the diaphragm induced by a change in pressure in the zone surrounding the monitor results in distortion of the distortable substrate, which is measurable by the SAW device mounted thereon, without distorting said reference substrate section.

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Totton, United Kingdom

Mark Lee