Window lifter system and method of controlling a plurality of window lifters

A method of controlling a plurality of window lifter motors which constitute a window lifter system comprising a first window lifter motor and a master control device for said first window lifter motor, said master control device being able to detect a position of a window pane driven by said first window lifter motor and to drive said first window lifter motor at a variable speed, at least one second window lifter motor and a slave control device for said second window lifter motor, said slave control device being able to detect a position of a window pane driven by said second window lifter motor and to drive said second window lifter motor at a variable speed, and a bus system by means of which said master and slave control devices are able to communicate with each other, said method comprising the following steps:

• said master control device moves a window pane driven by it at a speed which lies below an achievable maximum speed, from a fully open position into a fully closed position;
• there is measured a time which is needed for fully closing said window pane;
• said measured time is transferred to said slave control device as a set time and is stored there;
• said slave control device compares said set time with an actual time needed for the last closing action of said window pane driven by it, and appropriately corrects a drive speed;
• said corrected drive speed is stored and is used for the next closing action of said window pane.