Closure system with adjustable sensitivity
First Claim
1. A closure system for a lock of a motor vehicle, said closure system being remotely controllable by transmitter signals, comprising:
- at least one portable transmitter for emitting transmitter signals activating the lock;
a predetermined range around said motor vehicle within which said transmitter must be located for controlling the closure system, said predetermined range having an upper limit and a lower limit, a distance between said motor vehicle and said upper limit of said predetermined range being less than a distance over which the transmitter can physically transmit;
a receiver for receiving the emitted transmitter signals, the receiver triggering a control signal in response to receiving the emitted transmitter signals when the transmitter is located in said predetermined range;
a locking element which is controlled by the control signal and by means of which the lock is activated;
the receiver measuring a signal strength of the received transmitter signals, comparing a measured value of signal strength to a rated value stored in the receiver and setting a reception sensitivity of the receiver dependent on a result of the comparison of the measured value of signal strength to the rated value, the reception sensitivity being reduced when the measured value of signal strength exceeds the rated value such that the lock is activatable only when the transmitter is located within said predetermined range.
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Accused Products
Abstract
Closure system remotely controllable by transmitter signals (I) for one or more locks (L) of one or more openings (T), having a portable transmitter (S) as key (S) for radiating the transmitter signals (I), namely the UNLOCK transmitter signals (I) which (I) initiate the unlocking (Z) of the relevant lock or locks (L), and/or the LOCK transmitter signals (I) which initiate the locking (Z) of these locks (L), having a receiver (E) which (E), if it is within range (W) of the transmitter (S), triggers a control signal (Z) after the reception of the transmitter signals (I), and having a locking element (B) which can be controlled by the control signal (Z), by means of which (B) the relevant lock (L) can be locked and/or unlocked. The receiver (E) monitors a parameter of at least individual ones of the received transmitter signals (I), such as their (I) power or field strength, and adjusts--at least from time to time--the range (W), namely the sensitivity of the receiver (E) and/or the transmitting power of the transmitter (S) in accordance with the parameter monitored.
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Citations
16 Claims
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1. A closure system for a lock of a motor vehicle, said closure system being remotely controllable by transmitter signals, comprising:
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at least one portable transmitter for emitting transmitter signals activating the lock; a predetermined range around said motor vehicle within which said transmitter must be located for controlling the closure system, said predetermined range having an upper limit and a lower limit, a distance between said motor vehicle and said upper limit of said predetermined range being less than a distance over which the transmitter can physically transmit; a receiver for receiving the emitted transmitter signals, the receiver triggering a control signal in response to receiving the emitted transmitter signals when the transmitter is located in said predetermined range; a locking element which is controlled by the control signal and by means of which the lock is activated; the receiver measuring a signal strength of the received transmitter signals, comparing a measured value of signal strength to a rated value stored in the receiver and setting a reception sensitivity of the receiver dependent on a result of the comparison of the measured value of signal strength to the rated value, the reception sensitivity being reduced when the measured value of signal strength exceeds the rated value such that the lock is activatable only when the transmitter is located within said predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A closure system for a lock of a motor vehicle, said closure system being remotely controllable with transmitter signals, comprising:
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at least one portable transmitter for emitting transmitter signals for activating the lock; a predetermined range around said motor vehicle within which said transmitter must be located for controlling the closure system, said predetermined range having an upper limit and a lower limit, a distance between said motor vehicle and said upper limit of said predetermined range being less than a distance over which the transmitter can physically transmit; a receiver for receiving the emitted transmitter signals, and the receiver triggering a control signal in response to receiving the emitted transmitter signals when the transmitter is located within said predetermined range; an auxiliary transmitter in the receiver and an auxiliary receiver in the portable transmitter; and a lock element which is controlled by the control signal and by means of which the lock is activated; and the receiver measuring a signal strength of the received transmitter signals, comparing a measured value of the signal strength to a rated value stored in the receiver and, dependent on a result of the comparison of the measured value of the signal strength to the stored rated value, transmitting a further signal via the auxiliary transmitter in the receiver to the auxiliary receiver in the portable transmitter, as a result whereof transmission power of the portable transmitter is modified dependent on the result of the comparison, the transmission power being reduced when the measured value of signal strength exceeds the rated value such that the lock is activatable only when the transmitter is located within said predetermined range. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification