Method for charging a transponder

• US 5,696,485 A
• Filed: 11/06/1996
• Issued: 12/09/1997
• Est. Priority Date: 11/06/1996
• Status: Expired due to Term

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Treharne, William David
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): Pope, Daryl C.
• Application Number:
  US08/746,058
• Time in Patent Office: 398 Days
• Field of Search: 340/825.54, 340/825.31, 340/825.72, 340/825.34, 340/547, 340/425.5, 340/426, 340/543, 340/572, 235/382, 235/382.5, 342/51, 342/30, 342/44, 307/10.5, 307/10.4, 307/9.1-10.8
• US Class Current: 340/505
• CPC Class Codes: B60R 25/00 Fittings or systems for preventing or indicating unauthorised use or theft of vehicles locks for vehicles E05B77/00-E05B85/00
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G07C 2009/00603 by power transmission from lock
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 2209/61 Signal comprising different frequencies, e.g. frequency hopping
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks
• CPC Class Codes: G07C 9/00817 where the code of the lock can be programmed

Abstract

A method for charging a transponder using a transceiver, the method including the steps of powering the transceiver, emitting a transmit pulse from the transceiver, powering the transponder using the transmit pulse, generating a calibration signal with the transponder, transmitting the calibration signal to the transceiver, calibrating the transceiver based on the calibration signal received from the transponder, emitting a charge pulse from the transceiver to the transponder, and charging the transponder with the charge pulse.

Claims

1. A method for charging a transponder using a transceiver, the method including the steps of:

powering the transceiver;

emitting a transmit pulse from the transceiver;

powering the transponder using the transmit pulse;

generating a calibration signal with the transponder;

transmitting the calibration signal to the transceiver;

calibrating the transceiver based on the calibration signal received from the transponder;

emitting a charge pulse from the transceiver to the transponder; and

charging the transponder with the charge pulse.

2. A method as set forth in claim 1 including the step of generating a coded signal using the transponder.

3. A method as set forth in claim 2 including the step of transmitting the coded signal to the transceiver to determine whether the transponder is coded to the transceiver.

4. A method as set forth in claim 1 wherein the step of generating a calibration signal includes the step of discharging the transponder.

5. A method as set forth in claim 1 wherein the transmit pulse extends for a period in a range between five milliseconds and ten milliseconds.

6. A method as set forth in claim 1 wherein the charge pulse extends for a period in the range between forty milliseconds and fifty milliseconds.

7. A method for charging a transponder using a transceiver, the method including the steps of:

emitting a transmit pulse having a first pulse period from the transceiver;

powering the transponder using the transmit pulse;

generating a calibration signal with the transponder;

transmitting the calibration signal to the transceiver;

calibrating the transceiver based on the calibration signal received from the transponder;

emitting a charge pulse from the transceiver to the transponder, the pulse having a second pulse period greater than the first pulse period for the transmit pulse; and

charging the transponder with the charge pulse.

8. A method for charging a transponder using a transceiver, the method including the steps of:

emitting a transmit pulse having a first pulse period from the transceiver;

powering the transponder using the transmit pulse;

generating a calibration signal with the transponder;

transmitting the calibration signal to the transceiver;

calibrating the transceiver based on the calibration signal received from the transponder;

emitting a charge pulse from the transceiver to the transponder, the charge pulse having a second pulse period greater than the first pulse period for the transmit pulse;

charging the transponder with a charge pulse;

extending the transmit pulse for a period in the range of five milliseconds and ten milliseconds; and

extending the charge pulse for a period in the range between forty milliseconds and fifty milliseconds.

9. A method as set forth in claim 8 including the step of generating a coded signal using the transponder.

10. A method as set forth in claim 9 including the step of transmitting the coded signal to the transceiver to determine whether the transponder is coded to the transceiver.