Method and device for correction temperature-dependent changes in the mechanical properties of a mobile closing part of a vehicle

A device 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 of the motor vehicle, comprising

• a control switch,
• a control unit,
• a direct current motor activated by the control unit via a driver,
• a mobile closing part driven by the direct current motor,
• a memory for storing the anti-trap algorithm, and
• a reference characteristic non-volatile memory,
• wherein the reference characteristic memory has a number of memory areas operable to store a respective reference characteristic assigned to a corresponding different temperature, and
• the control unit including a microcomputer programmed to dynamically modify at least one of the reference characteristics over time to account for changes in the mechanical properties of the movable closing part over time 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 a stored respective reference characteristic based at least in part on the mechanical properties.

A system 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 of the motor vehicle, comprising:

• means for 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,
• a non-volatile memory storing the mechanical properties in the form of a first reference characteristic,
• wherein the stored first reference characteristic is compared with a calculated characteristic while the motor-vehicle is running, and
• wherein, while the motor-vehicle is running, the means are further operable to adaptively determine one or more second reference characteristics and to store the one or more second reference characteristics in the non-volatile memory, adaptively determining the one or more second reference characteristics 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 no trapping is occurring, updating the first reference characteristic and the second reference characteristic based at least in part on the current force value, and
• storing the one or more second reference characteristics in the non-volatile memory and associating it with a specific ambient temperature.