Empty elevator car determination

Details Empty elevator car determination Empty elevator car determination

1979-12-27

1981-11-10

Moses, R. L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 300

Patent

active

042993091

ABSTRACT:
An elevator system includes a microprocessor-based cab controller mounted directly on an elevator car. The activity of passenger-actuatable switches within the elevator car, such as car call, open door, emergency stop switches, and the like, is monitored as an indication of the presence of passengers within the elevator car. Without such activity, the car is determined, preliminarily, to be empty. If the conditions exist for a period of time, the car is determined to be really empty, in a second level determination of the empty status of the car. The utilization of passenger load weight, along with passenger actuatable switch activity, is also disclosed as a determination of the empty status of the car. An exemplary elevator system, an exemplary microprocessor-based controller, and a logic flowchart illustrative of the details of the invention are disclosed herein.

REFERENCES:
patent: 2776733 (1957-01-01), Drexler
patent: 3219151 (1965-11-01), Henker
patent: 3556256 (1971-01-01), Sprague
patent: 3616874 (1971-11-01), Stichweh et al.

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