Energy efficient passive entry system
First Claim
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1. A passive entry system for a vehicle comprising:
- a vehicle-based communication system mounted in a vehicle; and
a portable communication device;
wherein said vehicle-based communication system includes a transmitter for transmitting a challenge signal to said portable communication device when in a polling state to determine a presence of said portable communication device for allowing access to said vehicle;
wherein said portable communication device includes a receiver for receiving said challenge signal, and wherein said portable communication device is responsive to said challenge signal when in a response state and non-responsive to said challenge signal when in a non-response state, said portable communication device being placed into said non-response state in response to receiving a lock-out signal from said vehicle based communication system.
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Abstract
A passive entry system for a vehicle is provided that includes a vehicle-based communication module mounted in the vehicle and a portable communication device. The vehicle-based communication module includes a transmitter for transmitting a challenge signal to the portable communication device when in a polling state to determine a presence of the portable communication device for allowing access to the vehicle. The portable communication device includes a receiver for receiving the challenge signal and is responsive to the challenge signal when in a response state and non-responsive to the challenge signal when in a non-response state.
39 Citations
20 Claims
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1. A passive entry system for a vehicle comprising:
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a vehicle-based communication system mounted in a vehicle; and a portable communication device; wherein said vehicle-based communication system includes a transmitter for transmitting a challenge signal to said portable communication device when in a polling state to determine a presence of said portable communication device for allowing access to said vehicle; wherein said portable communication device includes a receiver for receiving said challenge signal, and wherein said portable communication device is responsive to said challenge signal when in a response state and non-responsive to said challenge signal when in a non-response state, said portable communication device being placed into said non-response state in response to receiving a lock-out signal from said vehicle based communication system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for conserving power in a portable communication device of a vehicular passive entry system, the method comprising the steps of:
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broadcasting a challenge signal from a vehicle base communication module to said portable communication device; broadcasting a response signal in response to said challenge signal; determining if said portable communication device is within an interior region of said vehicle; and broadcasting a lockout signal for placing said portable communication device into a non-response state it said portable communication device is within said interior of said vehicle. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification