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AssigneeMannesmann VDO AG
InventorsHans-Peter Lässle, Dietmar Schmid
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An improved receiver (5) of a remote control system, in particular for closing systems of a motor vehicle, and a method for operating such a remote control system are proposed. Modern motor vehicle closing systems are equipped with remote control systems which, in addition to the central locking of the doors, also perform so-called comfort functions such as the closing of the windows or of the sunroof. For safety reasons, such a comfort function must be terminated as soon as a signal fails to be received. If the remote control system is activated at the limit of its range, the response threshold of the receiver (5) may be undershot as a result of the transmitter (1) moving. This leads to undesired breaking off of the comfort function, or to jerky operation of the comfort function. According to the invention, it is therefore proposed to implement the response threshold of the receiver so that it is capable of being switched over. By virtue of the response threshold which is relatively high in the position of rest (status A) of the receiver, the remote control has a smaller range. After the detection of a signal, the comfort function is activated (status B) and the response threshold lowered (status C), so that the sensitivity and the range of the remote control system are then increased. The response threshold can be switched over, for example, by means of an attenuator (9).
A receiver of a remote control system, suitable for the closing system of a motor vehicle, is operative to receive signals of an associated transmitter, and is operative further to drive one or more actuators when signal levels above its response threshold are present, the receiver comprising means for determining if a signal level exceeds the response threshold, and means for automatically changing the response threshold of the receiver to a new threshold based on a value of the signal level, the new threshold level urging retention of a present state of activation of said one or more actuators.
A method for operating a remote control system, suitable for motor vehicles, the system comprising a transmitter and a receiver with response threshold which can be switched over, said method including the method steps of:
Dependencies are inferred from the claim text.