Method and apparatus for real-time estimation of four wheel...

Details Method and apparatus for real-time estimation of four wheel... Method and apparatus for real-time estimation of four wheel...

2009-05-15

2011-11-01

Thompson, Jewel V (Department: 2855)

Measuring and testing

Rotor unbalance

Reexamination Certificate

active

08047061

ABSTRACT:
A system and method for determining whether a particular wheel on a vehicle is un-balanced during operation of the vehicle. The method includes providing wheel angle signals from the wheels of the vehicle and providing a vibration measurement signal from a response point on the vehicle, such as from an accelerometer on a steering column of the vehicle. The method also includes generating a regression vector using the wheel angle signals. The method also includes generating an estimated parameter vector using a recursive least squares algorithm, the regression vector and the vibration measurement signal. The method then calculates an imbalanced magnitude value of each wheel of the vehicle using the estimated parameter vector. The method uses a persistency of excitation test to determine whether the parameter vector has converged to a true value to determine whether the calculated imbalanced magnitude values are accurate.

REFERENCES:
patent: 5025662 (1991-06-01), Hultberg
patent: 6244108 (2001-06-01), McInnes et al.

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