Calibration of electric current and grip force relationship for electrically operated car windows using spring tensioned cables, uses variation in motor supply current and motor angular movement

摘要

The characteristic magnitude of the electric motor is the value of its supply current. The current variation ( DELTA I2) is measured between a minimum value (Im) and the value (Io) at the start of a stabilized phase. The force (F), applied by springs (8a,8b) due to stretching ( DELTA z) caused by current between (Im) and (Io), is measured by application of F = k * DELTA z., where DELTA z is determined from the angle of rotation of the motor. Method of calculating the relation K between motor (2) supply current variation driving a kinematic chain designed to displace a part (7) with respect to a support and the variation of the force applied by the motor on the moving part. The kinematic chain includes spring (8,8b) tensioned cables (5) having a known stiffness (k).