CROSS CONDUCTION PROTECTION ON ANTENNAS
First Claim
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1. A method of limiting an active range of an identification device for a vehicle passive start and entry system comprising the steps of:
- a) determining an area within which a prompt signal to a remote identification device is desired; and
b) sending a neutral signal to prevent transmission of the prompt signal from another antenna corresponding to an area other than the desired area.
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Abstract
A passive entry and start system transmits a neutral signal over all the antennas except for that antenna that is proximate an area in which transmission to an identification device is desired. Accordingly, the area of a vehicle and those physical features that are proximate and associated with the area is isolated to prevent undesired operation of other vehicle mechanisms.
12 Citations
14 Claims
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1. A method of limiting an active range of an identification device for a vehicle passive start and entry system comprising the steps of:
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a) determining an area within which a prompt signal to a remote identification device is desired; and b) sending a neutral signal to prevent transmission of the prompt signal from another antenna corresponding to an area other than the desired area. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A passive start and entry system for a motor vehicle comprising:
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a controller; and a plurality of antennas for transmitting a challenge signal from the controller, wherein each of the plurality of antennas is associated with a corresponding area of the vehicle and the control module sends transmissions over each of the plurality of antennas to select which of the plurality of antennas transmits a challenge signal to a remote identification device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification