Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Reexamination Certificate
2008-11-24
2011-12-13
Black, Thomas (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
C702S142000
Reexamination Certificate
active
08078351
ABSTRACT:
A system and method for estimating surface coefficient of friction in a vehicle system. The method includes providing a kinematics relationship between vehicle yaw-rate, vehicle speed, vehicle steering angle and vehicle front and rear axle side-slip angles that is accurate for all surface coefficient of frictions on which the vehicle may be traveling. The method defines a nonlinear function for the front and rear axle side-slip angles relating to front and rear lateral forces and coefficient of friction, and uses the nonlinear function in the kinematics relationship. The method also provides a linear relationship of the front and rear axle side-slip angles and the front and rear lateral forces using the kinematics relationship. The method determines that the vehicle dynamics have become nonlinear using the linear relationship and then estimates the surface coefficient of friction when the vehicle dynamics are nonlinear.
REFERENCES:
patent: 5353225 (1994-10-01), Tsuyama et al.
patent: 5906650 (1999-05-01), Tsuno et al.
patent: 5948961 (1999-09-01), Asano et al.
patent: 6615124 (2003-09-01), Adachi
patent: 6922624 (2005-07-01), Isaji et al.
patent: 7117730 (2006-10-01), Karrer et al.
patent: 7406863 (2008-08-01), Ogawa
patent: 2001/0029419 (2001-10-01), Matsumoto et al.
patent: 2003/0028308 (2003-02-01), Ishikawa et al.
patent: 2003/0130775 (2003-07-01), Lu et al.
patent: 2006/0041365 (2006-02-01), Mori
patent: 2007/0222289 (2007-09-01), Fukuda et al.
patent: 2010/0131165 (2010-05-01), Salman et al.
Moshchuk Nikolai K.
Nardi Flavio
O'Dea Kevin A.
Ryu Jihan
Black Thomas
GM Global Technology Operations LLC
Marc-Coleman Marthe
Miller John A.
Miller IP Group, PLC
LandOfFree
Estimation of surface lateral coefficient of friction does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Estimation of surface lateral coefficient of friction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimation of surface lateral coefficient of friction will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4270749