Methods for vehicle speed accuracy compensation
First Claim
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1. A method, comprising:
- adjusting a determination of speed of a motor vehicle responsive to character recognition of an image from an on-board camera of the vehicle, the image including a speed measurement source external to the vehicle, and controlling power output of a motor propelling the vehicle based in part on a difference between a desired vehicle speed and the adjusted determination of vehicle speed to achieve the desired vehicle speed.
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Abstract
A method and system for calibrating a speed displayed in a vehicle is provided. In one example, a method includes adjusting a determination of vehicle speed responsive to character recognition of an image from an on-board camera of the vehicle, the image including an external speed measurement source (such as a radar speed sign) displaying a speed measurement. The speed displayed in the vehicle may be corrected if the determined vehicle speed is outside of a threshold range generated from the speed measurement displayed on the external speed measurement source.
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Citations
16 Claims
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1. A method, comprising:
adjusting a determination of speed of a motor vehicle responsive to character recognition of an image from an on-board camera of the vehicle, the image including a speed measurement source external to the vehicle, and controlling power output of a motor propelling the vehicle based in part on a difference between a desired vehicle speed and the adjusted determination of vehicle speed to achieve the desired vehicle speed. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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determining a speed of a motor vehicle based in part on output of sensors positioned on-board the vehicle; determining a reference speed of the vehicle based in part on on-board character recognition of a speed measurement source external to the vehicle; and correcting the determined vehicle speed when the determined vehicle speed is outside of a threshold range, the threshold range generated from the determined reference speed responsive to an indication that the speed measurement source external to the vehicle is functional. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A system for a vehicle, comprising:
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an engine configured to propel the vehicle; a plurality of wheels; wheel speed sensors configured to measure a number of revolutions over time of each of the wheels; a camera; a radar system; a speedometer; and a controller storing instructions in non-transitory memory that, when executed, cause the controller to; receive images captured by the camera and determine an external speed measurement in the images using an image recognition module; calculate vehicle speed using a vehicle speed module and output from the wheel speed sensors; and apply a vehicle speed compensation to the vehicle speed module responsive to the calculated vehicle speed being outside of a threshold range determined from the external speed measurement, the calculated vehicle speed and the external speed measurement being time-matched speed values, to generate a corrected vehicle speed. - View Dependent Claims (13, 14, 15, 16)
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Specification