Process for evaluating signals from an incremental transmitter

Details Process for evaluating signals from an incremental transmitter Process for evaluating signals from an incremental transmitter

1989-01-06

1991-05-07

Teska, Kevin J.

Boots, shoes, and leggings

364574, G01R 2902

Patent

active

050142151

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a process for evaluating signals from an incremental generator. An incremental generator is a component employed to digitally operate controls. It consists, for example, of a pulse generator in the form of a disk with a series of alternately optically and mechanically sensed indications on it that emit pulses when the component is activated, by rotating the disk for example. To make it possible to detect the direction that the disk is rotating in, the indications are radially displaced, such that two phase-shifted signals, in the form of square pulses for example, can be obtained at two output terminals of the generator. The direction that the disk is rotating in can then be detected by the phase of the two signals emerging from the generator. The pulses from one output terminal are employed to incrementally adjust controls that emit a control voltage that can be discontinuously varied higher or lower. The series of pulses obtained from the generator are processed such that every positive edge, for example, will vary a control parameter up or down to a prescribed extent.
Simple incremental generators, however, involve the drawback that the pulses they emit have noise at their edges that occurs when the equipment is jolted for example. The result is, for example, that every positive edge will vary one increment, that the controls will accordingly be varied to different extents even though the generator is set constant, and that several increments forward or backward for example will be processed even though only one pulse should have been generated and the generator is to be adjusted in only one direction.


SUMMARY OF THE INVENTION

The object of the invention, therefore, is to eliminate the effect of jolting on the very noisy switching edges of the pulses from a simple incremental generator in order to ensure unambiguous processing of the signals.
The invention will now be specified with reference to one embodiment by way of example.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 comprises graphs of the pulses derived from an incremental generator in accordance with the present invention.
FIG. 2 is a block diagram illustrating the apparatus.
FIG. 3 is a detail of the block diagram in FIG. 2.
FIG. 4 is a flow chart illustrating how the process operates.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 is a graph of pulses representing the signals at the output terminals A and B of an incremental generator. Since the point of departure for the present invention is a generator with output signals that are subject to jolting, the signals are subject to noise especially in the vicinities T of their edges. The jolting make decoding difficult or impossible without special measures being taken. These measures, however, are expensive. The process that will now be described is employed to avoid the expense. The process will now be described with reference to FIG. 2. It should be noted that the different stages of the process can easily be governed by a microprocessor, eliminating material costs in that the requisite program can be stored as will be explained hereinafter with reference to FIG. 4.
The signals a and b represented in FIG. 1 are at the output terminals A and B of the incremental generator 1 illustrated in FIG. 2. The sequence of signal illustrated in FIG. 1 occurs only when the generator is activated by means of knob 1', while incremental generator 1 is being adjusted. Otherwise any combination of 0 and 1 will be present at output terminals A and B. The incremental generator will release the following combinations, by way of example, to output terminals A and B in accordance with a rotation R to the right or L to the left: the sequence 00, 01, 11, 10, 00, . . . for one direction and the sequence 00, 10, 11, 01, 00, . . . for the other direction. It will be evident from this example that, no matter what direction the knob is turned in, the output signals will always occur in accordance with the sequence a=b=0, a.noteq.b, a=b=1, a.noteq.b, a=b=0,

REFERENCES:
patent: 3998088 (1976-12-01), Kazangey
patent: 4123750 (1978-10-01), Leney et al.
patent: 4308500 (1981-12-01), Avins
patent: 4486845 (1984-12-01), Duckworth
patent: 4534004 (1985-08-01), Vollmayr
patent: 4578748 (1986-03-01), Abe et al.
patent: 4669042 (1987-05-01), Henderson et al.

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