Vehicle theft detection device and method

• US 20040160314A1
• Filed: 02/18/2003
• Published: 08/19/2004
• Est. Priority Date: 02/18/2003
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Proefke, David T., Utter, Thomas E.
• Granted Patent: US 6,950,011 B2
• Time in Patent Office: Days
• US Class Current: 340/426.1
• CPC Class Codes: B60R 25/042 operating on the fuel supply
• CPC Class Codes: B60R 25/045 by limiting or cutting the electrical supply to the propulsion unit
• CPC Class Codes: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001
• CPC Class Codes: B60R 25/102 a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner

Abstract

A vehicle-motion based vehicle theft detection device uses preexisting vehicle motion sensors in combination with an engine immobilizer system to detect and deter potential vehicle theft. Depending on whether or not a valid ignition key is in use, the engine immobilizer system sends signals to an electronic module to enter either a “disarmed” or “armed” state. When a vehicle sensor relays a signal to an electronic module, the electronic module determines, based on this signal, if the vehicle is in motion. If a valid key is in use, the electronic module is in a disarmed state and takes no further action, as the motor vehicle is authorized for motion. If, however, a valid key is not in use, the electronic module is in an armed state, and activates the vehicle alarm system which, in turn, may activate an audible or visual alarm, activate a remote notification device, generate a tracking signal, and/or store evidence of unauthorized vehicle motion in memory.

Claims

1. A vehicle theft detection device comprising:

a vehicle motion sensor;

an authorized user detection mechanism;

an unauthorized motion notification function; and

a central control unit coupled to receive a first signal from the vehicle motion sensor and a second signal from the authorized user detection mechanism and configured to send a third signal to the unauthorized motion notification function in response to receiving both the first signal and the second signal.

2. The vehicle theft detection device of claim 1 wherein the vehicle motion sensor comprises a wheel speed sensor.

3. The vehicle theft detection device of claim 2 wherein the wheel speed sensor comprises a portion of an anti-lock brake sensor.

4. The vehicle theft detection device of claim 1 wherein the vehicle motion sensor comprises a tire pressure monitoring device capable of detecting wheel movement.

5. The vehicle theft detection device of claim 4 wherein the vehicle motion sensor comprises a centrifugal roll switch.

6. The vehicle theft detection device of claim 1 wherein the vehicle motion sensor comprises a global positioning satellite (GPS) system based position detection system.

7. The vehicle theft detection device of claim 1 wherein the authorized user detection system comprises an ignition switch and a key position sensor.

8. The vehicle theft detection device of claim 7 wherein the authorized user detection system comprises an engine immobilizer system coupled to the key position sensor.

9. The vehicle theft detection device of claim 8 wherein the key position sensor is configured to transmit encoded signals to the engine immobilizer system indicating the identity of a key inserted in the ignition switch and wherein the engine immobilizer is configured to determine from the encoded signals the presence or absence of a valid key in the ignition switch.

10. The vehicle theft detection device of claim 1 wherein the unauthorized motion notification function comprises a function selected from the group consisting of:

audible alarm, visual alarm, remote notification device, tracking signal device, and data logger memory.

11. A method for motor vehicle theft detection comprising the steps of:

receiving a first signal indicative of motion of a motor vehicle;

receiving a second signal indicative that a valid ignition key is not in use; and

activating a notification device in response to receiving both the first signal and the second signal.

12. The method of claim 11 wherein the step of receiving a first signal comprises the step of receiving a first signal from a sensor selected from the group consisting of a tire pressure monitoring device, a wheel speed sensor, and a GPS based position detection system.

13. The method of claim 11 further comprising the step of recording a record of the receipt of both the first signal and the second signal.

14. The method of claim 11 wherein the step of receiving a second signal comprises the steps of:

transmitting a key identifying signal from a key position sensor;

receiving the key identifying signal at an engine immobilizer system;

generating an invalid key signal at the engine immobilizer system; and

receiving the invalid key signal at a controller configured to receive the invalid key signal and the first signal.

15. A method for motor vehicle theft detection comprising the steps of:

generating a first signal indicative of motion of a motor vehicle;

generating a second signal indicative that a valid ignition key is in use;

generating a third signal indicative that a valid ignition key is not in use; and

generating a fourth signal activating an alarm if the first and third signals are detected, but not if the first and second signals are detected.

16. The method of claim 15 further comprising the step of logging a record of detection of the first and third signals.

17. A motor vehicle theft detection device comprising:

a vehicle motion sensor selected from the group consisting of a tire pressure monitoring device capable of detecting wheel movement, a wheel speed sensor, and a GPS based position detection system;

the vehicle motion sensor configured to transmit a first signal indicative of vehicle movement;

a vehicle immobilizer system coupled to an authorized user detection system and configured to send a second signal if a valid ignition key is inserted in the authorized user detection system and to send a third signal if a valid ignition key is not inserted in the authorized user detection system;

an alarm system configured for activation upon receipt of a fourth signal; and

a controller configured to receive the first signal, the second signal, and the third signal and to generate and send the fourth signal upon receipt of the first signal and the third signal, but to not generate the fourth signal upon receipt of the first signal and the second signal.

18. The motor vehicle theft detection device of claim 17 wherein the controller comprises a portion of a motor vehicle central control unit.

19. The motor vehicle theft detection device of claim 17 further comprising a memory coupled to the controller and configured to record the receipt of the first signal and the third signal.