Abstract: 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.

Abstract: An elevator includes a microprocessor-based cab controller mounted on the elevator car to monitor calls for service by passengers in the car, such as are registered on car call buttons requesting stops at specific floors, door open and door close buttons and the like, 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 which is disposed at the top of the shaftway and 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 hall calls at the landings, and the like.

Abstract: An elevator system having a microprocessor-based elevator door motion controller controls door motion by means of the difference between actual door velocity and a dictated door velocity, which is dictated in a variety of ways in dependence on conditions of the elevator. The disclosed invention comprises sensing a door reversal demand and causing the dictated velocity to be in accordance with a reverse acceleration factor determined as the square of the velocity of the door at the time the door reverse demand is made divided by twice the distance within which it is desired that the door shall stop after the reversal demand is made, before accelerating in the reverse direction, and providing a door-stopping boost or kick current to the elevator door motor in order to assist the door in stopping, the current being a derivative lag function of the velocity of the door at the time the reversal demand is sensed.

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.

Abstract: An elevator employing a microprocessor-based cab controller, for controlling, among other things, the opening and closing of the elevator car door, provides a pair of dictated door velocity profile signals and selects the one having the lesser value, to dictate motor current in accordance with the selected desired door motion profile. A first one of the profiles includes acceleration up to a desired maximum velocity, and a second one of the door motion profiles consists of a deceleration profile generated as a function of the distance from the door to a desired target position. An exemplary elevator system and cab controller, along with an exemplary door control program for the cab controller, establishing an environment in which the invention may suitably be practiced, and detailed program steps for effecting the present invention in such an environment are disclosed.