METHOD AND SYSTEM FOR GENERATING A SIGNAL INDICATING THE ROTATIONAL SPEED OF A DRUM

WIPO Patent Application WO/2017/072223

A3

The application concerns a system for measuring the rotational speed of a drum rotatably mounted to a mixer truck, rotating relatively to the mixer truck and having a main axis inclined relative to the mixer truck, even in case that the drum is empty. A sensor is mounted to the empty drum and generates a sinusoidal signal as the drum rotates; the sensor could be a load sensor experiencing forces due to the changing influence of gravity during rotation, or a light intensity sensor responsive e.g. to variations of ambient light during rotation. The sensor signal is transmitted over a wireless connection to a receiver. The frequency of the sinusoidal signal is measured and output as the rotational speed of the rotating drum. The application also concerns the determination of a direction of rotation, based on a phase shift between two periodic signals. One signal could be the periodic intensity variation on a first wireless transmission path during a full rotation. The other could be a periodic intensity variation on a second wireless transmission path, or a periodic variation of a sensed value such as the output of a load sensor or light intensity sensor.

BEAUPRE DENIS (CA)

PCT/EP2016/075917

August 03, 2017

October 27, 2016

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COMMAND ALKON DUTCH TECH B V (NL)

G01P3/48; B28C5/42; B28C7/02; G01P3/486; G01P13/04

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JP2006195798A	2006-07-27
FR2964745A1	2012-03-16
US20060142911A1	2006-06-29
US20120116607A1	2012-05-10

CABINET NOVITECH et al. (FR)

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