Method and system for estimating load in elevator car

The invention provides a method and a system for estimating the load in an elevator car. The method for estimating the load in the elevator car comprises the following steps of acquiring a no-load reference torque value TN0 of an elevator during the zero-speed servo running process; acquiring a full-load reference torque value TN1 of the elevator during the zero-speed servo running process; acquiring a real-time torque value TNX of the elevator during the zero-speed servo running process; substituting the TN0, the TN1 and the TNX into a load estimation formula to calculate the proportion of the load in the elevator car. According to the method and the system for estimating the load in the elevator car provided by the invention, the no-load reference torque value TN0, the full-load reference torque value TN1 and the real-time torque value TNX of the elevator during the zero-speed servo running process are acquired through self acquiring modules of an elevator system; the TN0, the TN1 and the TNX are substituted into the load estimation formula to calculate the proportion of the load in the elevator car, and a specific load elasticity measuring device does not need, so that the estimation value of the load in the elevator car is more accurate.