Hydraulic elevator having microprocessor-based, distributed cont

Details Hydraulic elevator having microprocessor-based, distributed cont Hydraulic elevator having microprocessor-based, distributed cont

1987-01-20

1988-11-29

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187101, B66B 100

Patent

active

047874813

ABSTRACT:
A hydraulic elevator system includes a hydraulic jack for raising and lowering the car and a distributed intelligence microprocessor control system, containing a number of subsystems, each having designated control responsibilities. A door operator microprocessor subsystem initiates stored open and close cycles responsive to external commands. A selector microprocessor subsystem determines target floor and distance values, produces slowdown interrupt signals when the car nears a target floor, and produces levelling signals for stopping the car at a landing. A car logic controller includes a microprocessor for issuing run commands to a relay-based power controller, issuing door open and door closed commands to the door operator microprocessor, issuing run signals to the selector microprocessor, and controlling elevator slowdown. A serial communications link is provided among the various microprocessors in the system.

REFERENCES:
patent: 4367810 (1983-01-01), Doane et al.
patent: 4436185 (1984-03-01), Ludwig et al.
patent: 4534452 (1985-08-01), Ogasawara et al.

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