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Patent Issued for Method and System for Performing Calibration of an Accelerometer of a Telematics Device during Installation in a Vehicle

July 16, 2014



By a News Reporter-Staff News Editor at Telecommunications Weekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventor Willis, Richard Ernest (Surrey, CA), filed on October 4, 2011, was published online on July 1, 2014.

The patent's assignee for patent number 8768560 is Webtech Wireless Inc. (Burnaby, CA).

News editors obtained the following quote from the background information supplied by the inventors: "An AVL or 'locator' in a vehicle must undergo an alignment procedure to allow it to represent, without error, the dynamic movements of the vehicle itself, such as vehicle acceleration, forward braking, and turning maneuvers, in the vehicles Cartesian coordinate frame. More particularly, the alignment procedure must perform a transform calibration of an accelerometer in the locator.

"One method of transform calibration of the accelerometer is that currently performed in accordance with the invention of the cross-referenced application after the locator is installed in the vehicle. It is done by putting the locator into a calibration state and then driving the vehicle in a prescribed manner. More particularly, this current transform calibration method involves both static and dynamic components. The dynamic component requires the vehicle to be driven on a flat surface and then braked to a stop.

"Although this current method of transform calibration works satisfactory, it is time consuming. Also, it requires skill and training of personnel as well as confirmation that it worked by calling a support person at a remote service center. There is, therefore, a need for an innovation that will avoid the restrictions of aforementioned accelerometer transform calibration method."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "The subject matter of the present invention provides such an innovation by enabling the performance of transform calibration of the accelerometer of a telematics device during the time the device is being installed in a vehicle while the latter is stationary. The entire accelerometer transform calibration is performed merely through physical manipulation and relocation of the telematics device during such installation. The present invention thus provides a simplified transform calibration method with local feedback to the installer regarding the success or failure of the transform calibration in that it removes the restrictions that the vehicle must be moved or be on level ground to transform calibrate the accelerometer and that a remote service technician must verify the success of the transform calibration. In other words, the present invention enables performance of the transform calibration entirely locally and along with local confirmation of the completion of a successful transform calibration.

"One aspect of the present invention is a method for performing transform calibration of an accelerometer of a telematics device during installation in a vehicle. The method includes placing a telematics device in a vehicle at an initial position having a known alignment with respect to a given frame of reference of the vehicle, moving the telematics device from the initial position to a final installation position in the vehicle with the telematics device concurrently tracking and integrating the angle changes of the moving telematics device to provide a set of coordinates of the final installation position, and transform calibrating an accelerometer of the telematics device using the set of coordinates so as to leave the telematics device installed at the final position in the vehicle with its accelerometer transform calibrated with respect to the given frame of reference of the vehicle. Further, the method includes employing a tri-axial rate gyroscope in the telematics device to track and integrate the angle changes of the moving telematics device and employing a computer in the telematics device to optimize the angle changes into the set of coordinates to create a solution that is recognizable to a Euler-based transform engine in the telematics device.

"Another aspect of the present invention is a system for performing calibration of an accelerometer of a telematics device during installation in a vehicle. The system includes a locator having an accelerometer capable of being transform calibrated, and a calibration tool operatively mounted with the locator to form a telematics device adapted to be moved from an initial aligned position in a vehicle to a final installation position therein. The calibration tool also is electrically coupled to the locator for supplying electrical power to the locator and transferring data from the calibration tool to the locator to facilitate transform calibration of the accelerometer in the locator. The calibration tool also is capable of concurrently tracking and integrating angle changes of the moving telematics device to provide a set of coordinates of the final installation position. More particularly, the calibration tool includes a tri-axial rate gyroscope to track and integrate the angle changes of the moving telematics device, and a computer to optimize the angle changes into the set of coordinates to create a solution that is recognizable to a Euler-based transform engine in the telematics device."

For additional information on this patent, see: Willis, Richard Ernest. Method and System for Performing Calibration of an Accelerometer of a Telematics Device during Installation in a Vehicle. U.S. Patent Number 8768560, filed October 4, 2011, and published online on July 1, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8768560.PN.&OS=PN/8768560RS=PN/8768560

Keywords for this news article include: Webtech Wireless Inc.

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Source: Telecommunications Weekly


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