A MULTIPOWER PASSIVE ENTRY FOB
First Claim
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1. A passive entry unit, the unit comprising:
- a passive entry input configured to generate a passive entry signal;
at least one user selectable control button configured to generate a control button signal;
a transmitter configured to transmit wireless signals; and
a controller configured to control transmission of the wireless signals as a function of the passive entry and control button signals, wherein the wireless signals are transmitted at a first power level for wireless signals associated with the passive entry signal and at a second power level for wireless signals associated with the control button signal.
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Abstract
Method and system of passive entry. The method and system relating to controlling signal power levels. The method and system may include limiting signal power levels so as to limit re-radiation interference.
34 Citations
20 Claims
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1. A passive entry unit, the unit comprising:
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a passive entry input configured to generate a passive entry signal;
at least one user selectable control button configured to generate a control button signal;
a transmitter configured to transmit wireless signals; and
a controller configured to control transmission of the wireless signals as a function of the passive entry and control button signals, wherein the wireless signals are transmitted at a first power level for wireless signals associated with the passive entry signal and at a second power level for wireless signals associated with the control button signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless, passive entry key fob device configured for use with a vehicle, the device including a passive entry portion to control passive entry to the vehicle and a remote control portion to control operation of at least one vehicle function, the device comprising:
a controller configured to control wireless signals transmitted from the device, wherein the controller is configured to facilitate transmission of wireless signals associated with passive entry at first power level and to transmit wireless signals associated with remote control at a second power level. - View Dependent Claims (11, 12, 17, 18)
- 13. The device of claim 13 wherein the controller issues signals to the transmitter to control the power level of the wireless signals.
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15. The device of claim 15 wherein the attenuator circuit limits power to an antenna associated with the transmitter when active such that only wireless signals associated with the first power level are transmitted if the attenuator circuit is active.
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16. The device of claim 16 wherein wireless signals associated with remote control are transmitted at the first power level instead of the second power level if the attenuator circuit is active.
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19. A method of limiting interference to a passive entry fob by a secondary RF unit, the method comprising:
configuring the fob to transmit wireless signals at multiple power levels such that wireless signals associated with passive entry are transmitted at a first power level and wireless signals associated with non-passive entry are transmitted at a second power level, the first power level being less than the second power level so as to limit re-radiation from the secondary RF unit, and thereby, interference with the passive entry fob. - View Dependent Claims (20)
Specification