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Passive RF-RF entry system for vehicles

  • US 6,396,412 B1
  • Filed: 08/17/2001
  • Issued: 05/28/2002
  • Est. Priority Date: 08/23/2000
  • Status: Expired due to Fees
First Claim
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1. A passive entry system for a vehicle that uses a bi-directional signal between the vehicle and a passive driver'"'"'s ID device comprising:

  • a transmitter and receiver on a vehicle, and a transmitter and receiver in a passive driver'"'"'s ID device;

    said vehicle being provided with a vehicle lock and a control for said vehicle lock, said vehicle transmitter and receiver taking a reference level signal strength of said passive driver'"'"'s ID device at said vehicle transmitter and receiver and storing a threshold value based on said level signal strength, and when a request occurs for access to said vehicle lock, said vehicle transmitter and receiver taking a current signal strength of a passive driver'"'"'s ID device, and comparing said current to said threshold values to determine whether the request is authorized.

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