Nearly every car manufacturer has a passive entry system as optional equipment for his vehicles in his program in the meantime. Passive means in this case, that you do not need to press any button on a remote key for unlocking your car. Instead you only have to approach the door handle with your hand up to a few centimeters. Provided that the authorized user carries a card or so called ID-device with him. When taking this ID-device into the car it fulfils the job of a common ignition key only with the difference that you do not need to put it into the cylinder of the ignition switch. In such systems it is very important to have special door handles with sensors and switches. Huf Hulsbeck & Furst GmbH & Co. KG has done a lot of basic and detail research in this field of business. This has resulted in a large number of contracted businesses for so called "Passive-Entry Door Handles" (14 in total) and made Huf the top address world wide for this product. The following article explains the functionality of Passive-Entry-Systems and the different design principles of such door handles.
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