Abstract: A hydraulic elevator system of an inverter control method directly controlling a flow amount of a pressed oil discharged from a hydraulic pump by a speed control of a motor driving the hydraulic pump, which can improve energy efficiency and stability. The hydraulic elevator system includes a reverse check valve connected between a hydraulic cylinder operated by the pressed oil to lift/lower an elevator car and a hydraulic pump driven to discharge the pressed oil, opened to pass the pressed oil by the pressure of the discharged pressed oil in a driving of the hydraulic pump, and closed to prevent the pressed oil from being reversed by using a pilot pressed oil of the hydraulic cylinder as a power source in a stopping of the hydraulic pump; and a pilot hydraulic cylinder operated by the pilot pressed oil from the hydraulic cylinder in order to apply an additional close force to the reverse check valve in the lifting/lowering or emergency stopping of the elevator car.

Abstract: Disclosed is an elevator door with an improved clutch device suitable for increasing clutch speed and decreasing clutch distance of a car door and a hatch door.

Abstract: A velocity instruction generating apparatus for a car of an elevator system and a velocity instruction generating method which make it possible to decrease a computation time, computation amount and computation error by computing a velocity instruction based on an integer number computation and control the velocity of the car in real time.

Abstract: An apparatus and a method for detecting a load amount of an elevator which detects the weight of the passengers of an elevator car in an elevator system including the steps of: setting an output data of a load detector for at least two load amounts between an no-load and full load; obtaining a non-linear relational function expression between the output data of the load detector and the load amounts on the basis of the set data; selecting one of the at least two functional expressions on the basis of the relational function expressions, and detecting and outputting a load amount for the passengers of the elevator car, and a method for detecting a load compensation amount of an elevator in which the initial starting torque of the drive motor is controlled according to passenger of the elevator car, including the steps of: setting load compensation amounts for at least two positions of an elevator car between the lowermost floor and the uppermost floor where the elevator is moved; obtaining a non-linear relatio