Correction of factors in vehicle accelerometer signals
First Claim
1. A method for measuring and storing values of sensor bias in acceleration values for a vehicle, the acceleration values obtained from a sensor over a plurality of time periods, the sensor having a specified range of expected variability of sensor bias values, the method comprising:
- (a) measuring a first value of sensor bias in acceleration values obtained from the sensor during operation of the vehicle in a first time period;
(b) storing the measured first value of sensor bias for use in one or more subsequent time periods;
(c) measuring a second value of sensor bias in acceleration values obtained from the sensor during operation of the vehicle in a second time period;
(d) subtracting the measured second value of sensor bias from the stored first value of sensor bias, thereby generating a sensor bias difference; and
(e) storing the measured second value of sensor bias, for reference in one or more subsequent time periods, if the sensor bias difference is within the specified range of expected variability of sensor bias values.
12 Assignments
0 Petitions
Accused Products
Abstract
A method for measuring and storing values of sensor bias in acceleration values for a vehicle, obtained over a plurality of time periods from a sensor having a specified range of expected variability of sensor bias values, includes measuring a first value of sensor bias obtained during operation of the vehicle in a first time period, storing the measured first value of sensor bias for use in one or more subsequent time periods, measuring a second value of sensor bias obtained during operation of the vehicle in a second time period, subtracting the measured second value of sensor bias from the stored first value of sensor bias, thereby generating a sensor bias difference, and storing the measured second value of sensor bias, for reference in one or more subsequent time periods, if the sensor bias difference is within the specified range of expected variability of sensor bias values.
9 Citations
20 Claims
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1. A method for measuring and storing values of sensor bias in acceleration values for a vehicle, the acceleration values obtained from a sensor over a plurality of time periods, the sensor having a specified range of expected variability of sensor bias values, the method comprising:
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(a) measuring a first value of sensor bias in acceleration values obtained from the sensor during operation of the vehicle in a first time period; (b) storing the measured first value of sensor bias for use in one or more subsequent time periods; (c) measuring a second value of sensor bias in acceleration values obtained from the sensor during operation of the vehicle in a second time period; (d) subtracting the measured second value of sensor bias from the stored first value of sensor bias, thereby generating a sensor bias difference; and (e) storing the measured second value of sensor bias, for reference in one or more subsequent time periods, if the sensor bias difference is within the specified range of expected variability of sensor bias values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining a value for an environmental condition effect in acceleration values in a present time period for a vehicle using sensor data obtained over a plurality of time periods, the method comprising:
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(a) measuring an acceleration value for the present time period; (b) retrieving a stored sensor bias value from a previous time period; and (c) calculating, using a processor, an environmental condition value for the present time period, calculated at least in part from the measured acceleration value for the present time period and the stored sensor bias value from the previous time period. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for measuring acceleration values and condition values for a vehicle over a plurality of time periods, the apparatus comprising:
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a sensor configured to measure an acceleration value for a present time period; and a processor configured to; retrieve a stored sensor bias value from a previous time period; and calculate an environmental condition value for the present time period, calculated at least in part from the acceleration value for the present time period and the stored sensor bias value from the previous time period. - View Dependent Claims (20)
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Specification