Hydraulic elevator control system using a plurality of solenoid

Details Hydraulic elevator control system using a plurality of solenoid Hydraulic elevator control system using a plurality of solenoid

1989-12-15

1992-12-08

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 904

Patent

active

051700212

ABSTRACT:
Hydraulic elevator system with a hydraulic actuator equipped with a piston, movable in both directions, to raise and lower a cab, a tank of hydraulic fluid and a pump for fluid, a bypass shutter, to control ascent of the piston, and a down shutter to control its descent, a microprocessor for controlling the valves. To compensate variations in load, temperature and pressure of the hydraulic fluid, solenoid valves are provided, driving the shutters, with on/off pulses of variable duration, depending on the information on the behavior and conditions of the system, obtained by feedback of pressure and temperature of the hydraulic fluid and the position and velocity of the elevator car.

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patent: 4757879 (1988-07-01), Rita
patent: 4785914 (1988-11-01), Blain et al.
patent: 4932502 (1990-06-01), Blain et al.

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