System and method for monitoring vehicle parameters and driver behavior

  • US 8,630,768 B2
  • Filed: 05/22/2007
  • Issued: 01/14/2014
  • Est. Priority Date: 05/22/2006
  • Status: Active Grant
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First Claim
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1. A monitoring device for monitoring an operation of a vehicle, the monitoring device being configured for determining and using a relative orientation of the monitoring device, relative to the vehicle, for facilitating accurate monitoring of the vehicle, the monitoring device comprising:

  • a housing having a vertical orientation defined by a vertical axis and a horizontal orientation defined by a housing centerline;

    an accelerometer unit with at least one accelerometer;

    at least one processor which is communicatively coupled to the accelerometer unit; and

    an accelerometer module with computer-executable instructions configured to perform, when executed by the at least one processor, self-orienting of the monitoring device relative to the vehicle, wherein the self-orienting includes;

    observing one or more gravitational forces on the at least one accelerometer when it is determined that the vehicle is stopped;

    using the one or more observed gravitational forces to determine a gravity vector;

    calculating a first offset angle representing an angular difference between the gravity vector and the vertical axis of the housing;

    identifying one or more acceleration measurements detected by the at least one accelerometer while the vehicle is moving;

    using the one or more acceleration measurements to determine a line in which the vehicle is moving and associating the line in which the vehicle is moving with a centerline of the vehicle; and

    calculating a second offset angle representing an angular difference between the centerline of the vehicle and the housing centerline.

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