Patent ID: 9007185
Filing Date: 2015-04-14
Classification: B60R,G07C,G08C

Abstract:
1. A method for teaching a plurality of keys to an authorization device in a vehicle, comprising: transmitting a test signal to keys in a reception range of the authorization device, the test signal being transmitted by the authorization device; measuring a location dependent signal strength of the test signal, the signal strength being measured by the keys in the reception range such that each key in the reception range has a respective signal strength measurement dependent on a physical location of the key; for each key in the reception range, ascertaining a key-specific time window based on the respective signal strength measurement such that each key in the reception range has a respective key-specific time window; for each key in the reception range, sending a response signal in the respective key-specific time window; and recording each response signal in the authorization device.