Systems and methods for virtual ignition detection

• US 8,489,271 B2
• Filed: 11/01/2010
• Issued: 07/16/2013
• Est. Priority Date: 10/31/2009
• Status: Active Grant

• Current Assignee: CalAmp Corporation
• Original Assignee: CalAmp Corporation
• Inventors: Hergesheimer, Peter D., Hall, Stephen, Whiteside, Joseph Brian
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US12/917,234
• Publication Number:
  US 20110106373A1
• Time in Patent Office: 988 Days
• Field of Search: 701/2, 701/32.3, 701/31.4, 180/173, 340/425.5, 340/426.1, 340/428, 340/428.13, 340/426.3, 340/426.19, 307/9.1
• US Class Current: 701/31.4
• 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
• CPC Class Codes: G06F 7/00 Methods or arrangements for processing data by operating upon the order or content of the data handled logic circuits H03K19/00
• CPC Class Codes: G07C 5/02 Registering or indicating driving, working, idle, or waiting time only apparatus forming part of taximeters G07B13/00

Abstract

Systems and methods for determining vehicle ignition state using a device added to the vehicle after the manufacture of the vehicle without a direct connection to the vehicle ignition line are disclosed. In a number of embodiments, a system includes a processor, a motion detector configured to detect vehicle motion and to enable the processor to obtain motion data, a Global Positioning System (GPS) receiver configured to determine location and to enable the processor to obtain at least speed data, and a radio transceiver configured to communicate with the processor. Additionally, the processor is configured to estimate the ignition state of a vehicle using at least the motion data and the speed data.

Claims

1. A system configured to estimate the ignition state of a vehicle without a connection to the ignition line of the vehicle, comprising:

a processor;

a motion detector configured to detect vehicle motion and to enable the processor to obtain motion data;

a Global Positioning System (GPS) receiver configured to determine location and to enable the processor to obtain at least speed data;

a radio transceiver configured to communicate with the processor;

a power supply configured to connect to a power line; and

a voltage detector configured to enable the processor to obtain voltage data, wherein the voltage data is indicative of voltage measurements at the power supply;

wherein the processor is configured to;

determine initial power supply voltage data using the voltage detector;

detect changed voltage data using the voltage data and the voltage detector;

estimate an ignition state of on for the vehicle using the initial power supply voltage data, the changed voltage data, the motion data, and the speed data when the changed voltage data is indicative of an increase in the voltage measurements at the power supply; and

estimate an ignition state of off for the vehicle using the initial power supply voltage data, the changed voltage data, the motion data, and the speed data when the changed voltage data is indicative of a decrease in the voltage measurements at the power supply.

2. The system of claim 1 wherein the motion detector is an accelerometer.

3. The system of claim 1 wherein the processor is configured to activate the GPS receiver upon detection of vehicle motion.

4. The system of claim 1 wherein the speed data is derived using the Doppler effect.

5. The system of claim 1 wherein the speed data is derived using differences in location over time.

6. The system of claim 1, wherein:

the processor is configured to start a timer when the motion data and the position data are below predetermined thresholds; and

the processor is configured to place the GPS receiver in a sleep mode when the motion data and the speed data remain below the predetermined thresholds for the duration of the timer.

7. The system of claim 1 wherein,

the processor is further configured to match the motion data against specific signatures indicative of a vehicle being towed.

8. The system of claim 1, further comprising:

a noise detector configured to enable the processor to obtain noise data, wherein the noise data is indicative of a running engine.

9. The system of claim 1, further comprising:

a vehicle bus detector configured to enable the processor to obtain bus data, wherein the bus data is indicative of voltage transitions on a vehicle data bus.

20. The system of claim 1, wherein the processor is further configured to:

store the estimated ignition state; and

iteratively estimate the ignition state of the vehicle based on the initial power supply voltage data, the changed voltage data, the motion data, the speed data, and the stored estimated ignition state.

10. A method for estimating the ignition state of a vehicle without connecting to the vehicle'"'"'s ignition line, the method comprising:

detecting vehicle motion using a motion detector;

detecting vehicle speed using a Global Positioning System (GPS) receiver;

detecting voltage using a voltage detector, wherein the voltage is indicative of voltage measurements at a power supply configured to connect to a power line;

estimating the ignition state of a vehicle using a processor based on at least the detected voltage, the detected vehicle speed and vehicle motion, where an increase in the detected voltage is indicative of the ignition state of the vehicle being on and a decrease in the detected voltage is indicative of the ignition state of the vehicle being off; and

transmitting the ignition state estimated by the processor to a remote device using a radio transceiver.

11. The method of claim 10 wherein the detecting vehicle motion further comprises using an accelerometer as a motion detector.

12. The method of claim 10 further comprising detecting vehicle speed in response to detection of vehicle motion.

13. The method of claim 10 wherein the speed data is derived using the Doppler effect.

14. The method of claim 10 wherein the speed data is derived using differences in location over time.

15. The method of claim 10, further comprising:

starting a timer after detection of motion when the detected vehicle motion and vehicle speed are below predetermined thresholds; and

sleeping the GPS receiver when the vehicle motion and vehicle speed remain below the predetermined thresholds for the duration of the timer.

16. The method of claim 10, further comprising:

detecting towing of the vehicle by matching the detected motion against specific signatures indicative of a vehicle being towed using the processor.

17. The method of claim 10, further comprising:

detecting noise using a noise detector, wherein the noise is indicative of a running engine; and

wherein the processor utilizes the detected noise when estimating the ignition state of a vehicle.

18. The method of claim 10, further comprising:

detecting voltage transitions using a vehicle data bus, wherein the voltage transitions is indicative of voltage transitions on a vehicle data bus; and

wherein the processor utilizes the detected voltage transitions when estimating the ignition state of a vehicle.

21. The method of claim 10, further comprising:

storing the estimated ignition state using the processor; and

iteratively estimating the ignition state of the vehicle based on the initial power supply voltage data, the changed voltage data, the motion data, the speed data, and the stored estimated ignition state using the processor.

19. A system configured to estimate the ignition state of a vehicle without a connection to the ignition line of the vehicle, comprising:

a processor configured to estimate the ignition state of a vehicle;

a motion detector configured to detect vehicle motion and to enable the processor to obtain motion data;

wherein the motion detector is an accelerometer;

a Global Positioning System (GPS) receiver configured to determine location and to enable the processor to obtain at least speed data;

wherein the speed data is derived using differences in location over time;

wherein the processor is configured to activate the GPS receiver upon detection of vehicle motion;

wherein the processor is configured to start a timer when the motion data and the position data are below predetermined thresholds; and

wherein the processor is configured to place the GPS receiver in a sleep mode when the motion data and the speed data remain below the predetermined thresholds for the duration of the timer;

a radio transceiver configured to communicate with the processor;

a power supply configured to connect to a power line;

a voltage detector configured to enable the processor to obtain voltage data, wherein the voltage data is indicative of voltage measurements at the power supply; and

wherein the processor is configured to;

determine initial power supply voltage data using the voltage detector;

detect changed voltage data using the voltage data and the voltage detector;

estimate an ignition state of on for the vehicle using the initial power supply voltage data, the changed voltage data, the motion data, and the speed data when the changed voltage data is indicative of an increase in the voltage measurements at the power supply; and

estimate an ignition state of off for the vehicle using the initial power supply voltage data, the changed voltage data, the motion data, and the speed data when the changed voltage data is indicative of a decrease in the voltage measurements at the power supply.