Method and device for controlling a hydraulic lift

An apparatus for controlling a hydraulic elevator, having a car (2), which is movable up and down along an elevator shaft (1), a reciprocating piston connected to the car (2), a reciprocating cylinder (3) for driving the reciprocating piston, an oil pump (40) for driving the car (2) by means of pressurized oil, a motor (39), supplied by a controllable power supply part (28), for driving the oil pump (40), a valve unit (43) which is built in between a pump line (42) and a cylinder line (44), a sensor (13) for sensing the speed of the car (2), and a control and governing unit (10), with which the movement of the car (2) can be varied, wherein the car (2) is operated at at least two rated speeds, namely at a first speed (fast speed) and a second speed (creep speed), and transitional phases between these two speeds on the one hand, and the second speed (creep speed) and a stop on the other, the transitional phases being distinguished by a continuous change in speed,

• characterized in that
• the control and governing unit (10) has means (12, 18, 19, 22, 27), with the aid of which the oil pump (40) and the valve unit (43) are triggerable in such a way that upon downward motion at a speed approximately equal to or less than the second speed (creep speed), the regulation of the speed of the car (2) by the control and governing unit (10) is effected on the basis of the signal of the sensor (13) in such a way that regulating action is exerted on the valve unit (43), while in downward motion with a speed approximately equal to or greater than the second speed (creep speed) and in upward motion, the regulation of the speed of the car (2) is effected in that regulating action is exerted on the power supply part (28) and thus on the motor (39) and the oil pump (40).