Patent ID: 6510923
Filing Date: 2003-01-28
Classification: B66B

Abstract:
A method for controlling a hydraulic elevator, the elevator car (1) of which is capable of being moved by means of a hydraulic drive consisting of a lifting piston (2) and of a lifting cylinder (3), in that hydraulic oil is capable of being conveyed through a cylinder line (4) into the hydraulic drive (2, 3) and out of the hydraulic drive (2, 3) by means of a pump (10) and with the cooperation of a first control valve unit (5) and a second control valve unit (15), the flow of hydraulic oil being capable of being checked by measuring means, the pressure in the cylinder line (4) being capable of being detected by means of a load-pressure sensor (18), and the function of the elevator being capable of being controlled and regulated by means of a control apparatus (20) carrying out the method, comprising:determining, with the elevator car (1) at a standstill, the load on the elevator car (1) by the load-pressure serisor (18) detecting the pressure PZ in the cylinder line (4), regulating the upward travel of the elevator car (1) by a variation in the activation of the second control valve unit (15), in that a desired traveling curve dependent on the load on the elevator car (1) and representing a time profile of the pressure in the cylinder line (4) is compared with the continuous changes in the pressure in the cylinder line (4), the controlling command for the second control valve unit (15) being generated from the control deviation, regulating the downward travel of the elevator car (l) by a variation in the activation of the first control valve unit (5), in that a desired traveling curve dependent on the load on the elevator car (1) and representing a time profile of the pressure; in the cylinder line (4) is compared with the continuous changes in the pressure in the cylinder line (4), the controlling command for the first control valve unit (5) being generated from the control deviation.