Boots – shoes – and leggings
Patent
1982-10-06
1985-12-31
Smith, Jerry
Boots, shoes, and leggings
364187, 371 9, G06F 1546
Patent
active
045625280
ABSTRACT:
A backup control apparatus comprises a main control system (1) and a backup control system (2), coupled in parallel, and correcting circuits (61 to 64). If and when the main control system is in an abnormal state, the abnormal state of the main control system is determined by a switch control portion (3). A drive portion (5) coupled to the output of the main control system is switched by a switch portion (4) in response to the determined output to be coupled to the output of the backup control system. A tracking signal obtained from proportional integrating elements (17, 19) included in the main control system abruptly fluctuates as a function of the abnormal state of the main control system. The fluctuation of the tracking signal is mitigated by the correcting circuit including a dead time component or a first order lag component, whereupon the same is applied to proportional integrating elements (27, 29) included in the backup control system. The drive portion is controlled in response to the control signal based on the tracking signal after correction during a period of time when the switch portion is switched from the main control system to the backup control system.
REFERENCES:
patent: 3636331 (1972-01-01), Amrehm
patent: 3978659 (1976-09-01), Smith et al.
patent: 4029952 (1977-06-01), Giras et al.
patent: 4351023 (1982-09-01), Richer
MacDonald Allen
Mitsubishi Denki & Kabushiki Kaisha
Smith Jerry
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