Motor vehicle with a central locking unit and a remote control for its operation
First Claim
1. In a motor vehicle with a central locking system connected with a plurality of door locks, a remote-actuation unit including at least one transmitter acting as a key for the central locking system and having a coder, at least one receiver responsive to the transmitter and connected to the central locking system and having a decoder complementary to the coder and operating with high-frequency frequency modulation, whereby for operating the central locking system, commands are transmitted and received in a communications protocol, the improvement wherein:
- the remote-actuation unit is configured as a bandspread remote actuating device with a multiplicity of M channels and with N channels used in a frequency hopping spread spectrum mode, where (M≦
SN);
switching is effected from one channel to another channel of the N channels in accordance with a timing pattern determined by a timing algorithm and with a certain time interval Izs ;
the time interval Izs of the timing pattern is greater than a duration Δ
t of the communications protocol;
each timing pattern of the transmitter and the receiver is determined by a respective counter setting and to establish synchronism of the timing patterns after each operation of said system the counter state of the transmitters is transferred to the receiver;
a reference clock generator 16 provided for a carrier frequency generated by said transmitter; and
said reference clock generator has a temperature compensator to maintain a precise temperature compensated clock frequency thereof.
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Accused Products
Abstract
A central locking system of a motor vehicle is provided with communication between the transmitter of the remote actuation unit and the receiver of the central locking system in a frequency-hopping spread spectrum mode where M channels are used of a total of N channels of the spread spectrum frequency band chosen, for example, an I/S/M band of 433 MHz to 435 MHz. Switching is effected from one channel to another channel of the N channels in accordance with a timing pattern in which the timing interval Izs is greater than the duration Δt of the communication protocol.
33 Citations
10 Claims
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1. In a motor vehicle with a central locking system connected with a plurality of door locks, a remote-actuation unit including at least one transmitter acting as a key for the central locking system and having a coder, at least one receiver responsive to the transmitter and connected to the central locking system and having a decoder complementary to the coder and operating with high-frequency frequency modulation, whereby for operating the central locking system, commands are transmitted and received in a communications protocol, the improvement wherein:
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the remote-actuation unit is configured as a bandspread remote actuating device with a multiplicity of M channels and with N channels used in a frequency hopping spread spectrum mode, where (M≦
SN);switching is effected from one channel to another channel of the N channels in accordance with a timing pattern determined by a timing algorithm and with a certain time interval Izs ; the time interval Izs of the timing pattern is greater than a duration Δ
t of the communications protocol;each timing pattern of the transmitter and the receiver is determined by a respective counter setting and to establish synchronism of the timing patterns after each operation of said system the counter state of the transmitters is transferred to the receiver; a reference clock generator 16 provided for a carrier frequency generated by said transmitter; and said reference clock generator has a temperature compensator to maintain a precise temperature compensated clock frequency thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification
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- Resources
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Current AssigneeKiekert AG (Lingyun Industrial Corporation Limited)
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Original AssigneeKiekert AG (Lingyun Industrial Corporation Limited)
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InventorsKulik, Klaus, Bartel, Peter, Welskopf, Fred
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Primary Examiner(s)Gaffin, Jeffrey
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Assistant Examiner(s)KAPLAN, JONATHAN STUART
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Application NumberUS08/966,460Time in Patent Office537 DaysField of Search307/9.1-10.6, 340/825.03, 340/825.2, 340/825.3, 340/825.31, 340/825.34, 340/825.39, 340/825.58, 340/825.69, 340/825.72, 375/200, 375/202US Class Current340/5.26CPC Class CodesB60R 25/2072 with means for preventing j...B60R 25/24 using electronic identifier...G07C 2009/00198 the keyless data carrier ha...G07C 2009/00793 by Hertzian wavesG07C 2209/61 Signal comprising different...G07C 9/00182 operated with unidirectiona...
