Sensor offset calibration using map information
First Claim
1. A method of calibrating an onboard sensor of a vehicle having a control system, the method comprising:
- collecting, with the control system, vehicle status data generated by onboard instruments, measurement devices, sensors, and/or transducers during operation of the vehicle;
obtaining navigation map data with the control system during operation of the vehicle, the navigation map data comprising road data that characterizes road geometry, including road curvature, road grade, road contour, and/or road banking angle;
analyzing the collected vehicle status data and the obtained navigation map data to determine that calibration initiation conditions are satisfied for purposes of performing a zero value offset calibration of the onboard sensor to reduce sensor error associated with baseline or zero condition readings of the onboard sensor;
checking the road data of the navigation map data to determine whether current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor;
calculating, with the control system, a current zero offset value for the onboard sensor based on the collected vehicle status data and the obtained navigation map data, wherein the calculating is triggered only in response to satisfaction of the calibration initiation conditions, and only when the checking step determines that the current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor; and
calibrating, with the control system, the onboard sensor using the current zero offset value, wherein the calculated current zero offset value is applied to adjust nonzero raw sensor values associated with baseline or zero condition readings of the onboard sensor.
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Accused Products
Abstract
Systems, processes, and techniques for calibrating an onboard sensor of a vehicle are presented here. The vehicle has a control system that is capable of performing at least some of the tasks related to the calibration procedure. An exemplary methodology collects vehicle status data and obtains navigation map data during operation of the vehicle. A current calibration factor is calculated for the onboard sensor, based on the collected vehicle status data and the obtained navigation map data. More specifically, the vehicle status and navigation map data can be used to determine when the current conditions are suitable for performing calibration. When the current conditions are satisfactory, the calibration factor is calculated. Thereafter, the onboard sensor can be calibrated in response to the current calibration factor.
8 Citations
19 Claims
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1. A method of calibrating an onboard sensor of a vehicle having a control system, the method comprising:
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collecting, with the control system, vehicle status data generated by onboard instruments, measurement devices, sensors, and/or transducers during operation of the vehicle; obtaining navigation map data with the control system during operation of the vehicle, the navigation map data comprising road data that characterizes road geometry, including road curvature, road grade, road contour, and/or road banking angle; analyzing the collected vehicle status data and the obtained navigation map data to determine that calibration initiation conditions are satisfied for purposes of performing a zero value offset calibration of the onboard sensor to reduce sensor error associated with baseline or zero condition readings of the onboard sensor; checking the road data of the navigation map data to determine whether current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor; calculating, with the control system, a current zero offset value for the onboard sensor based on the collected vehicle status data and the obtained navigation map data, wherein the calculating is triggered only in response to satisfaction of the calibration initiation conditions, and only when the checking step determines that the current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor; and calibrating, with the control system, the onboard sensor using the current zero offset value, wherein the calculated current zero offset value is applied to adjust nonzero raw sensor values associated with baseline or zero condition readings of the onboard sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer readable storage media comprising executable instructions capable of performing a method of calibrating on onboard sensor of a vehicle, the method comprising:
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collecting, with a control system of the vehicle, vehicle status data generated by onboard instruments, measurement device, sensors, and/or transducers during operation of the vehicle; obtaining navigation map data with the control system during operation of the vehicle;
the navigation map data comprising road data that characterizes road geometry, including road curvature, road grade, road contour, and/or road banking angle;analyzing the collected vehicle status data and the obtained navigation map data to determine whether calibration initiation conditions are satisfied for purposes of performing a zero value offset calibration of the onboard sensor to reduce sensor error associated with baseline or zero condition readings of the onboard sensor; checking the road data of the navigation map data to determine whether current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor; calculating, with the control system, a current zero offset value for the onboard sensor based on the collected vehicle status data and the obtained navigation map data, wherein the calculating is performed only when the calibration initiation conditions are satisfied, and only when the checking determines that the current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor; and calibrating the onboard sensor using the current zero offset value, wherein the calculated current zero offset value is applied to adjust nonzero raw sensor values associated with baseline or zero condition readings of the onboard sensor. - View Dependent Claims (12, 13, 14)
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15. A vehicle comprising:
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an onboard sensor configured to generate raw sensor values; and a control system comprising at least one processor device to collect vehicle status data generated by onboard instruments, measurement devices, sensors, and/or transducers during operation of the vehicle, obtain navigation map data during operation of the vehicle, the navigation map data comprising road data that characterizes road geometry, including road curvature, road grade, road contour, and/or road banking angle, analyze the collected vehicle status data and the obtained navigation map data to determine whether calibration initiation conditions are satisfied for purposes of performing a zero value offset calibration of the onboard sensor to reduce sensor error associated with baseline or zero condition readings of the onboard sensor, check the road data of the navigation map data to determine whether current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor, calculate a current zero offset value for the onboard sensor based on the collected vehicle status data, wherein the current zero offset value is calculated only when the calibration initiation conditions are satisfied, and only when the checking step determines that the current road conditions are suitable for purposes of initiating zero value offset calibration of the onboard sensor, and calibrate the onboard sensor with the current zero offset value, wherein the calculated current zero offset value is applied to adjust nonzero raw sensor values associated with baseline or zero condition readings of the onboard sensor. - View Dependent Claims (16, 17, 18, 19)
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Specification