Patent ID: 8620531

Claim:
A method for reducing the influence of temperature-dependent changes in the mechanical properties of a closing part of a motor vehicle able to be moved by a direct current motor, on an anti-trap algorithm executed by a microcomputer of the motor vehicle, comprising: determining the mechanical properties of the movable closing part during production of the motor vehicle during a closing process of the movable closing part at a first ambient temperature, storing the determined mechanical properties in the form of a first reference characteristic in a memory of the motor vehicle in a non-volatile manner, comparing the stored first reference characteristic to a characteristic calculated by the microcomputer while the motor-vehicle is running, and while the motor-vehicle is running, the microcomputer adaptively determining a second reference characteristic by: first obtaining a current characteristic point at a given temperature by applying linear interpolation between two previously stored characteristic points corresponding respectively to one temperature higher than the given temperature and one temperature lower than the given temperature, comparing the current characteristic point to a current drive force value of the direct current motor indicative of whether trapping is occurring, and if the comparison of the current characteristic point to the current drive force value shows that no trapping is occurring, updating the stored first reference characteristic and the second reference characteristic based at least in part on the mechanical properties, and storing the second reference characteristic in the memory of the motor vehicle in a non-volatile manner, wherein the second reference characteristic defines mechanical properties of the movable closing part during a closing process of the movable closing part at a different ambient temperature.