ELEVATOR SAFETY SUPERVISING ENTITY WITH TWO UNITS HAVING AN OPTION FOR E.G. AUTONOMOUS PASSENGER EVACUATION

摘要

An elevator safety supervising entity (SSE) (33) is proposed. It comprises - a car safety supervising unit (SSU) (35) controlling functions of car safety components (30, 31) and comprising at least one car sensor (17, 19, 21) for sensing car-related parameters, - a head SSU (37) controlling functions of shaft safety components (14, 16) and comprising at least one shaft sensor (23, 25) for sensing shaft-relatedparameters and - a data linkage (38) for transmitting signal data between the car SSU (35) and the head SSU (37). Both the car SSU (35) and the head SSU (37) are adapted to detect a failure in the other one of the car SSU (35) and the head SSU (37) and to detect a failure in signal data transmission via the data linkage (38) and to switch from a normal operation mode to a failure operation mode upon detecting such failure. In the failure operation mode, the car SSU (35) and the head SSU (37) are adapted for operating autonomously and the car SSU (35) is adapted for controlling at least the functions of the car safety components (30, 31) based on information derived from sensed car-related parameters but excluding shaft- related parameters sensed by shaft sensors(23, 25) of the head SSU (37) and the head SSU (37) is adapted for controlling at least the functions of shaft safety components (14, 6) based on information derived from sensed shaft related parameters but excluding car- related parameters sensed by car sensors (17, 19, 21) of the car SSU (35). Thereby, the elevator (1) may be kept operative at least temporarily with a sufficiently high safety even when functions of the elevator SSE (33) are disturbed due to failures and e.g. passengers may be evacuated from the elevator car (3) before completely stopping elevator operation.