Method and system for correcting sensor offsets
First Claim
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1. A sensor offset correction method for a vehicle comprising;
- generating a first offset correction signal for a vehicle dynamic sensor at a sensor power-up, and in response to the vehicle moving prior to completion of power-up, averaging a maximum and a minimum of offset values acquired during vehicle operation and using said average of said maximum and said minimum as said first offset correction signal;
generating a second offset correction signal for said vehicle dynamic sensor when the vehicle is moving; and
correcting said vehicle dynamic sensor in response to at least one of said first offset correction signal and said second offset correction signal.
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Abstract
A control system (18) for an automotive vehicle (19) having a vehicle body includes a cluster (16) of vehicle dynamic sensors (27, 28, 30, 31), the output signals from the sensors (Yaw Rate Sensor, Roll Rate Sensor, Longitudinal Acceleration Sensor, Lateral Acceleration Sensor) are corrected for errors by removing the zero output DC bias. Such bias constitutes an error that may occur as a result of temperature changes, manufacturing defects, or other factors. The system (18) also compensates for the drift in the sensor output signals that occur during vehicle operation.
227 Citations
22 Claims
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1. A sensor offset correction method for a vehicle comprising;
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generating a first offset correction signal for a vehicle dynamic sensor at a sensor power-up, and in response to the vehicle moving prior to completion of power-up, averaging a maximum and a minimum of offset values acquired during vehicle operation and using said average of said maximum and said minimum as said first offset correction signal; generating a second offset correction signal for said vehicle dynamic sensor when the vehicle is moving; and correcting said vehicle dynamic sensor in response to at least one of said first offset correction signal and said second offset correction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A sensor offset correction method for a vehicle comprising:
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generating a first offset correction signal for a vehicle dynamic sensor at a sensor power-up in response to a DC bias; generating a temperature drift signal for said sensor; generating a second offset correction signal for said vehicle dynamic sensor when the vehicle is moving in response to said temperature drift signal; generating a third offset correction signal for said vehicle dynamic sensor when the vehicle is at rest and said vehicle dynamic sensor is below an accuracy threshold; correcting said vehicle dynamic sensor in response to said first offset correction signal, said second offset correction signal and said third offset correction signal; generating said third offset correction signal in response to said vehicle dynamic sensor indicating a change in lateral acceleration or longitudinal acceleration; delaying generating said third offset correction signal until vehicle turning has ceased; compensating for an initialization occurring during a vehicle turn table event when the vehicle is standing still following said initialization; and pausing offset compensation in response to continuous vehicle turning for a specified time; detecting a non-zero roll rate value signal; compensating for said roll rate value signal continuously by an amount substantially equal to a maximum temperature drift rate of said roll rate value signal; detecting a non-zero yaw rate value signal; detecting a non-zero value for a road bank angle signal; adjusting a lateral acceleration offset, such that lateral acceleration drives said road bank angle signal to zero; detecting a non-zero value for a average road pitch angle signal; and adjusting a longitudinal acceleration offset, such that lateral acceleration drives said road bank angle signal to zero. - View Dependent Claims (21)
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22. A control system for an automotive vehicle having a vehicle body comprising:
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a cluster of vehicle dynamic sensors positioned within the vehicle body adapted to generate a plurality of vehicle dynamic signals; and a controller adapted to receive said plurality of vehicle dynamic signals, said controller further adapted to generate a first offset correction signal for one of said cluster of said vehicle dynamic sensors in response to a DC bias and at a sensor power-up, said controller further adapted to generate said first offset correction signal such that a filtered roll rate is approximately zero and a filtered yaw rate is approximately zero; said controller, in response to the vehicle moving prior to completion of initialization, adapted to average offset values previously acquired and use them as said first offset correction signal; said controller further adapted to generate said first offset approximately equal to a previously stored sensor signal from a previous driving cycle, said controller further adapted to generate a second offset correction signal for said one of said cluster of said vehicle dynamic sensors in response to a signal equivalent to a temperature drift signal and when the vehicle is moving, said controller further adapted to generate a third offset correction signal for said one of said cluster of said vehicle dynamic sensors when the vehicle is at rest and said one of said cluster of said vehicle dynamic sensors is below an accuracy threshold, said controller further adapted to correct said one of said cluster of said vehicle dynamic sensors in response to said first offset correction signal, said second offset correction signal and said third offset correction signal, said controller further adapted to pause an offset correction when an RSC sensor disturbance flag is set or during events from at least one of ABS, AYC, TCS, or RSC.
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Specification