Vehicle attitude angle estimation using sensed signal blending
First Claim
1. A method for estimating an attitude angle of a vehicle, said method comprising the steps of:
- sensing angular attitude rate of a vehicle and producing an output signal indicative thereof;
sensing one of lateral and longitudinal acceleration of the vehicle and producing an output signal indicative thereof;
producing an attitude angle estimate;
updating said attitude angle estimate as a function of said sensed angular attitude rate;
determining an acceleration-based attitude angle as a function of said sensed acceleration;
providing a blending coefficient; and
generating a current vehicle attitude angle estimate as a function of said updated attitude angle estimate, said acceleration-based attitude angle, and said blending coefficient.
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Abstract
An attitude angle estimator and method of estimating attitude angle of a vehicle. According to one embodiment, an angular attitude rate sensor senses angular attitude rate of a vehicle, and an accelerometer detects lateral or longitudinal acceleration. An attitude angle estimate is produced and is updated as a function of the sensed angular attitude rate. An acceleration-based attitude angle is determined as a function of the sensed acceleration, and a blending coefficient is provided. A *current vehicle attitude angle estimate is generated as a function of the updated attitude angle estimate, the acceleration-based attitude angle, and the blending coefficient. According to a second embodiment, both a roll angle estimate and a pitch angle estimate are determined.
152 Citations
25 Claims
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1. A method for estimating an attitude angle of a vehicle, said method comprising the steps of:
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sensing angular attitude rate of a vehicle and producing an output signal indicative thereof;
sensing one of lateral and longitudinal acceleration of the vehicle and producing an output signal indicative thereof;
producing an attitude angle estimate;
updating said attitude angle estimate as a function of said sensed angular attitude rate;
determining an acceleration-based attitude angle as a function of said sensed acceleration;
providing a blending coefficient; and
generating a current vehicle attitude angle estimate as a function of said updated attitude angle estimate, said acceleration-based attitude angle, and said blending coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for estimating a roll angle of a vehicle, said method comprising the steps of:
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sensing angular roll rate of a vehicle and producing an output signal indicative thereof;
sensing lateral acceleration of the vehicle and producing an output signal indicative thereof;
producing a roll angle estimate;
updating said roll angle estimate as a function of said sensed angular roll rate;
determining an acceleration-based roll angle as a function of said sensed lateral acceleration;
providing a roll blending coefficient; and
further updating said roll angle estimate as a function of said acceleration-based roll angle and said roll blending coefficient to generate a current vehicle roll angle estimate. - View Dependent Claims (12, 13, 14, 15, 16, 17)
sensing angular pitch rate of the vehicle and producing an output signal indicative thereof;
sensing longitudinal acceleration of the vehicle and producing an output signal indicative thereof;
producing a pitch angle estimate;
updating said pitch angle estimate as a function of said sensed angular pitch rate;
determining an acceleration-based pitch angle as a function of said sensed longitudinal acceleration;
providing a pitch blending coefficient; and
further updating said pitch angle estimate as a function of said acceleration-based pitch angle and said pitch blending coefficient to generate a current vehicle pitch angle estimate.
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13. The method as defined in claim 11 further comprising the step of detecting a rough road condition of the vehicle, and adjusting said roll blending coefficient as a function of said detected rough road condition.
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14. The method as defined in claim 11 further comprising the step of detecting an airborne condition of the vehicle, and adjusting said roll blending coefficient as a function of said detected airborne condition.
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15. The method as defined in claim 12 further comprising the step of detecting a rough road condition of the vehicle, and adjusting said pitch blending coefficient as a function of said detected rough road condition.
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16. The method as defined in claim 11, wherein said step of updating said roll angle estimate includes a step of integrating said sensed angular roll rate over a time period, and adding said integration to said roll angle estimate.
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17. The method as defined in claim 11, wherein said step of further updating said roll angle estimate comprises multiplying said roll blending coefficient by the difference between said acceleration-based roll angle and said updated roll angle estimate, and further adding said multiplication to said updated roll angle estimate.
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18. A vehicle attitude angle estimator for use in a vehicle, said vehicle angle estimator comprising:
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an angular attitude rate sensor for sensing angular attitude rate of a vehicle and producing an output signal indicative thereof;
an accelerometer for detecting one of lateral and longitudinal acceleration of the vehicle and producing an output signal indicative thereof;
a controller for producing an attitude angle estimate and updating said attitude angle estimate as a function of said sensed angular attitude rate;
said controller determining an acceleration-based attitude angle as a function of said sensed acceleration, said controller further providing a blending coefficient and generating a current vehicle attitude angle estimate as a function of said updated attitude angle estimate, said acceleration-based attitude angle, and said blending coefficient.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
an angular pitch rate sensor for sensing angular pitch rate of the vehicle and producing an output signal indicative thereof;
a longitudinal accelerometer for detecting longitudinal acceleration of the vehicle and producing an output signal indicative thereof; and
said controller produces a pitch angle estimate and updates said pitch angle estimate as a function of said sensed angular pitch rate, and said controller determines an acceleration-based pitch angle as a function of said sensed longitudinal acceleration, said controller further providing a blending coefficient and generating a current vehicle pitch angle estimate by further updating said pitch angle estimate as a function of said acceleration-based pitch angle and said pitch blending coefficient.
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23. The vehicle angle estimator as defined in claim 18, wherein said angular attitude rate sensor comprises an angular pitch rate sensor for sensing angular pitch rate and said accelerometer comprises a longitudinal acceleration for detecting longitudinal acceleration, said controller producing a pitch angle estimate and updating said pitch angle estimate as a function of said sensed angular pitch rate, and said controller determining an acceleration-based pitch angle as a function of said sensed longitudinal acceleration, said controller further providing a pitch blending coefficient and further updating said pitch angle estimate as a function of said acceleration-based pitch angle and said pitch blending coefficient to generate a current vehicle pitch angle estimate.
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24. The vehicle angle estimator as defined in claim 18, wherein said controller generates said current vehicle attitude angle estimate by multiplying said blending coefficient by the difference between the acceleration-based angle estimate and the updated attitude angle estimate, said controller further adding said multiplication to the updated attitude angle estimate.
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25. The vehicle angle estimator as defined in claim 18, wherein said rough road detector detects the rough road condition of the vehicle as a function of said acceleration-based attitude angle.
Specification