Electricity: motive power systems – Positional servo systems – 'sampling' systems including miscellaneous 'sampled data'...
Patent
1986-01-03
1988-11-15
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
'sampling' systems including miscellaneous 'sampled data'...
318599, 364178, G05B 2102
Patent
active
047852232
ABSTRACT:
A method of generating a sampling signal succesion for use in a control system utilizing pulse-length modulated control signals, especially for controlling the tension or position of a continuously advancing web, such as in rotary printing machines, includes sampling and storing an error signal after a time interval having a duration approximately equal to an equalization time of the controlled system and commencing with the termination of a preceding adjustment step while the control system is out of operation, generating a binary signal of a length in time which is proportional to the error signal, sampling and storing a sum of the error signal and a deviation error signal during an additional time interval considerably shorter than the time constant of the controlled system, and extending the binary signal proportionally to the deviation control signal. An arrangement for performing the method includes two sampling devices connected in parallel to the output of a comparator and each including a series arrangement of a normally open contact, a storage unit, and a normally closed contact, the output of one sampling device being connected directly to a first input of a summing device and through another contact of the other sampling device to a second input of the summing device, while the output of the other sampling device is connected directly to a third input of the summing device. The output of the summing device is connected to inputs of a pulse-length modulator and a signum-forming element, whose outputs are connected to a control device for a drive.
REFERENCES:
patent: 4494184 (1985-01-01), Crevel
patent: 4511830 (1985-04-01), Yamada et al.
patent: 4642542 (1987-02-01), McKeand
Hank Dietrich
Richter Friedrich
Dobeck Benjamin
Striker Michael J.
VEB Kombinat Polygraph "Werner Lamberz Leipzig"
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