Passive keyless entry system
First Claim
1. A keyless entry system for a vehicle having an electric door lock mechanism, and including:
- a portable beacon adapted to be carried by the operator of the vehicle and comprising transmitter means for transmitting a coded beacon signal; and
receiver means associated with the vehicle and including antenna means for receiving said beacon signal when said beacon is within a predetermined range and controller means for decoding said beacon signal and activating a predetermined function associated with the vehicle in response thereto, said controller means being further adapted to automatically activate said electric door lock mechanism to lock the doors of the vehicle after the operator leaves the vehicle and carries said beacon out of said predetermined range.
6 Assignments
0 Petitions
Accused Products
Abstract
A passive keyless entry system is disclosed that is specifically adapted for use with automotive vehicles. The system is designed to automatically unlock the vehicle as the operator approaches the vehicle. The system is further designed to automatically lock the vehicle as the operator, carrying the beacon, moves away from the vehicle. The system includes a portable beacon that is carried by the operator, a receiver/controller located in the vehicle, and an antenna connected to the receiver/controller for receiving the encoded transmission from the beacon. The beacon includes a motion sensor to conserve battery life when the beacon is stationary. Transmission between the beacon and the receiver/controller is characterized by a magnetically coupled radio frequency signal embodying differential phase encoded data with error correction coding of the data to enhance noise immunity and signal discrimination.
196 Citations
8 Claims
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1. A keyless entry system for a vehicle having an electric door lock mechanism, and including:
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a portable beacon adapted to be carried by the operator of the vehicle and comprising transmitter means for transmitting a coded beacon signal; and receiver means associated with the vehicle and including antenna means for receiving said beacon signal when said beacon is within a predetermined range and controller means for decoding said beacon signal and activating a predetermined function associated with the vehicle in response thereto, said controller means being further adapted to automatically activate said electric door lock mechanism to lock the doors of the vehicle after the operator leaves the vehicle and carries said beacon out of said predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification