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 Vehicle security system

Details
Inventors: Talbot, Kevin Trevor; Burdock, William;
Assignee: Rover Group Limited (Birmingham, GB2)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Ganjian; Peter
Attorney, Agent or Firm: Davis and Bujold

The security system comprises a coil (34) close to the vehicle ignition lock (38), a control unit (10) for energizing the coil and a transponder which comprises a coil (32), a transistor (30) and a transmitter (24) and a power supply (26). In use the coil (32) picks up a conventional alternating magnetic signal emitted by the coil (34), and provides sufficient power to activate the transistor (30) which connects the power supply (26) to the transmitter (24) causing it to transmit an enabling signal to the control unit. The control unit may be programmed to re-mobilize the vehicle engine on receiving of the correct signal.

DETAILED DESCRIPTION We claim: 1.
A security system for a vehicle which includes a component, the system comprising: a portable transmitter unit comprising a transmitter for transmitting a coded signal, a power source for the transmitter, and manual actuation means for causing the transmitter to transmit the coded signal; a receiver for mounting on the vehicle; control means arranged to enable or disable said component in response to receipt of the coded signal by the receiver; an ignition lock for the vehicle; a key for operating the ignition lock; and means for producing an energy field if the key is used in the ignition lock while said component is disabled, wherein the transmitter unit further comprises switch means which can be operated by the energy field to connect the transmitter to the power supply to cause the transmitter to transmit the coded signal for reception by the receiver.
2.
A system according to claim 1 wherein the energy producing means is mounted in the vehicle near to the ignition lock.
3.
A system according to claim 1 further comprising key detection means for detecting use of the key in the ignition lock wherein the control means is arranged to produce the energy field only if the detection means detects use of the key in the ignition lock.
4.
A system according to claim 1 wherein the control means is arranged to produce the energy field only if the component is disabled.
5.
A system according to claim 3 wherein the transmitter unit is attached to the key.
6.
A system according to claim 1 wherein said energy field is an alternating magnetic field.
7.
A system according to claim 1 wherein said energy field comprises electromagnetic radiation.
8.
A system according to claim 1 wherein the means for producing said energy field comprises a coil.
9.
A system according to claim 1 wherein the switch means includes a coil for producing an electromotive force in response to said energy field.
10.
A system according to claim 1 wherein the energy field comprises a magnetic field of substantially constant direction


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