Patent Document ID: 7637355
Application ID: 12068861
Patent Flag: 1

Claim One:
1. A method for improving the performance of an elevator system, said elevator system including at least one elevator, said elevator including at least one elevator door and at least one door operator for opening and closing said elevator door, the method comprising: measuring the torque of a door motor moving said at least one elevator door and at least one of the acceleration and velocity of the elevator door; creating for the elevator door a dynamic model incorporating the forces acting on the elevator door; estimating kinetic parameters of the elevator door via the use of the aforesaid measured acceleration or the aforesaid measured velocity and the aforesaid measured torque and the dynamic model of the elevator door; modeling in the dynamic model of the elevator door the acceleration or velocity of the elevator door as a function of one or more kinetic parameters, said parameters being mass of the elevator door, frictional force acting on the elevator door, force caused by the tilt angle of the elevator door and operational state of the closing device; calculating a first error function either as the difference between the measured instantaneous acceleration of the elevator door and the instantaneous elevator door acceleration modeled in the model or as the difference between the measured instantaneous velocity of the elevator door and the instantaneous elevator door velocity modeled in the model; calculating a second error function by squaring the first error function and summing the squared first error functions obtained over a certain time interval with desired weighting coefficients; calculating one or more of the aforesaid parameters by minimizing the second error function; feeding back the calculated parameters to the dynamic model for use in the next calculation cycle; and optimizing the operation of the elevator door via the use of the estimated kinetic parameters to improve the performance of the elevator system.