Otis Elevator Company

Gary K Roberts

John C Doane

J Mark Deric

An elevator includes a microprocessor-based cab controller mounted on the elevator car to monitor calls for service by passengers in the car, controls the opening and closing of the door, monitors the position of the car relative to an adjacent landing and communicates with a microprocessor-based car controller, disposed at the top of the shaftway, which controls the motion of the car in the shaftway and provides commands to the cab controller, such as door opening and closing demands relating to calls at the landings, and the like. The cab controller monitors the viability of communications which it receives from the car controller, monitors the position of the door relative to the position of the car with respect to floor landings and provides a signal to enable applying power to the sheave-driving motor and the brake pick-up coils in the machine room only in the event that such monitoring indicates no safety problems. Similarly, the cab controller monitors the elevator door and all of the hoistway doors, and in dependence upon the position of the elevator with respect to a floor landing and the speed of the elevator, determines unsafe conditions and directly opens the power circuit to the door motor. An exemplary elevator system, including an exemplary microprocessor-based cab controller, a general door control program flowchart, illustrative of a system in which the present invention may be practiced, and detailed apparatus and flowcharts for practicing the present invention are all disclosed.

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Enfield, CT, United States of America

Gary K Roberts