Ford Motor Company Limited

Scott O Campbell

John F Kennedy

David P Laude

Lawrence P Kirk

Luke Aaron Perkins

William David Treharne

Paul Simmons

Michael A Thomas

An anti-theft system for a removable accessory has a transponder with a transponder security code located in the removable accessory. A remote sensing coil is operatively coupled to the transponder. A memory stores a security code corresponding to the transponder. A control module coupled to the remote sensing coil and the memory generates an interrogate signal and receives a response signal through the remote sensing coil. The transponder generating a response signal in the form of a transponder security code in response to the interrogate signal. The control module compares the transponder security code to the stored security code. If the transponder security code is not equal to the stored security code, a predetermined function is disabled. An output means is coupled to the control module for providing an indication to a vehicle operator of the disabled predetermined function.

Anti-theft sysem for a removable accessory of an automotve vehicle

A security system utilizing a key-mounted transponder achieves fast and accurate charging of the transponder by using a frequency search and acquisition phase which attempts partial charging pulses at a plurality of spaced frequencies. After a successful partial charging, a frequency calibration signal is received from the transponder which provides a reference in the transceiver for producing a pulse for fully charging the transponder. Frequency search and acquisition allows robust system operation while using low cost and low tolerance parts.

Charging a transponder in a security system

A key-in-ignition lock reminder system uses a key having a transponder with an identification code. An ignition lock for receiving the key has an adjacent antenna. A door proximity switch connected to the door generates a door open signal when the door is open. A control module is connected to a door lock control, the door proximity switch and a memory storing at least one identification code. The control module energizes the antenna coil which energizes a transponder. The transponder then transmits an identification code which is received by the antenna. The control module generates a control signal if the code from the transponder is equivalent to an identification code stored in the memory and the door proximity switch indicates the door is open. An indicator connected to the control module receives the control signal and generates an indication that the key is in the ignition lock.

Key-in-ignition lock reminder system

A circuit and method of demodulating an FSK signal uses digital circuitry to convert the received signal into count values. For each reception an adaptive reference count value is determined by averaging the duration of received pulses during the preamble of the transmission. The adaptive reference count corresponds to a demodulated logic '1' or logic level '0'. The counts from the coded portion of the transmission are compared to the adaptive reference count. If the count is within predetermined windows from the reference count, the count value is converted to the corresponding digital signal.

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Canton, MI, United States of America

Scott O Campbell