Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Of independently movable working members
Patent
1985-08-15
1986-12-02
Look, Edward K.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Of independently movable working members
91361, 91459, F15B 2102
Patent
active
046256229
ABSTRACT:
A system and method for pulse-width modulation of multiple solenoid-operated valves in an electrohydraulic servo system employing a microprocessor-based digital controller. Solenoid-energization pulse widths are identified by comparison of operator command input signals to feedback signals responsive to actual motion at the actuators and loads. During each modulation period, all solenoids are initially selectively simultaneously energized as a function of binary information stored in an energization control register, and the shortest energization pulse duration is identified. After a delay corresponding to such shortest duration, during which the microprocessor may perform other control functions, the solenoids associated with such shortest duration are selectively de-energized as a function of binary information stored in a de-energization control register. The next-shortest duration is then identified, and the process again delays for a time equal to the difference between such next-shortest duration and the previous duration. The process of identifying pulse durations of increasing length and correspondingly deenergizing the solenoids continues until all pulse durations have been accommodated or until the modulation period terminates, at which point the entire control process rebegins.
REFERENCES:
patent: 3421318 (1969-01-01), Falk
patent: 4037519 (1977-07-01), Miller et al.
patent: 4106390 (1978-08-01), Kodaira et al.
patent: 4416187 (1983-11-01), Nystrom
patent: 4539967 (1985-09-01), Nakajima et al.
Gunda Rajamouli
Rode Melvin A.
Look Edward K.
Vickers Incorporated
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