Eaton Corporation

Delphi Technologies, Inc.

Jean-Paul Corbier

Lawrence J Ryczek

Roger James Briggs

Philippe Zeraffa

Patrick L Clairet

Christine Couronne

The invention concerns a method for indirect and sequential measuring of the absolute position of an element ( ) comprising a binary coding produced by means of coding units ( ) of the same surface, relatively moving with respect to an element provided with a device for reading said coding ( ), said coding ( ) delimiting differentiated sectors each comprising an identical separating zone, called separator, and an zone identifying a single sector, called identifier, the list of the identifier codes being contained in a memory zone accessible via a device for processing binary data transmitted sequentially bit by bit by said reading device when the elements are relatively moving. The invention is characterised in that the separator coding comprises a binary sequence which is excluded from the identifier coding, thereby immediately identifying a separator, whose knowledge of the whole code indicates the identifier following it, then the position of its corresponding sector by scanning the memory zone containing the list of identifier codes.

Device and method for digital position measuring

A rotor disk or color wheel received on a shaft to be sensed has an annular band of dual color (red/green) filter material having opposite circumferential gradient. A printed circuit board on one axial side of the rotor disk has the dual color LED, emitting light to a reflector on the opposite axial side of the rotor disk. Some reflected light from the LED passes through the filter which transmits, according to the amount of single color filter material present at the particular rotor station to a photodetector on the circuit board. Other rays of the emitted light are reflected directly to a second detector for ambient compensation. The amount of light transmitted by the filter causes the detector current to vary the charge rate of a capacitor charged to a reference level, and when reached the LED is switched to the other of the dual color emission. The time required to charge the capacitor to the reference level determines the fraction of the duty cycle of the output signal which may be correlated with known data on the color gradient to determine the rotor angular position. A second color wheel is indexed or geared up or down as an integrator for counting the number of full revolutions of the shaft color wheel.

Rotary position sensor/transducer employing rotor having color filtering

Operational diagnostic system for an angle detector (C) which measures the angle of a rotating part (2) via at least two dual-state logic signals (A, B) processed by an electronic device which encodes them as the weighted sum of their voltages in order to produce an analog signal at a voltage which is always greater than a predefined threshold when angle detector (C) functions normally, in such a way that the value of the measured angle is transmitted over a single electrical connection (S) connecting the output of angle detector (C) to a processing device (U) of the processor type, and the connection (S) is also used by the processing device (U) to transmit the command signal to start testing of the operation of the detector (C), and to transmit the result information from the detector (C) to the processing device (U), and features the following:

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Beausoleil, France

Jean-Paul Corbier