Boots – shoes – and leggings
Patent
1981-06-09
1984-02-14
Ruggiero, Joseph F.
Boots, shoes, and leggings
364161, 364186, 371 9, G05B 903, G05B 2302, G06F 1546
Patent
active
044320485
ABSTRACT:
In a multiple digital controller system which comprises a main or first digital controller and at least one stand-by or second digital controller and in which the main digital controller normally applies the control signal to an object to be controlled, and the stand-by digital controller applies the control signal to the controlled object when the main digital controller is disabled, an improvement is made so that an undesirable level variation may not substantially occur in the control signal applied to the controlled object during the transient state of switch-over from the main digital controller to the stand-by digital controller. In the improved multiple digital controller system according to the present invention, the integral calculation to be carried out in the stand-by digital controller in a period n (n=2, 3, . . . ) is executed on the basis of the data representing the result of integral calculation carried out in the preceding period (n-1) in the main digital controller and transmitted from the main digital controller, in order to eliminate the influence of the difference in conversion error occurring in the A/D converters of the digital controllers.
REFERENCES:
patent: 3939328 (1976-02-01), Davis
patent: 3940594 (1976-02-01), Bleak et al.
patent: 4059745 (1977-11-01), Gaertner
patent: 4236202 (1980-11-01), Giles et al.
Arita Setsuo
Ito Tetsuo
Hitachi , Ltd.
Ruggiero Joseph F.
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