Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2001-10-16
2003-04-15
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C180S446000, C192S0120BA
Reexamination Certificate
active
06547031
ABSTRACT:
BACKGROUND
Motor vehicle handling instabilities are generally a function of a combination of the yaw rate and lateral acceleration of the motor vehicle and the motor vehicle speed. Such instabilities may result in an oversteer or an understeer condition being experienced by the vehicle. The encounter of the motor vehicle with such a condition generally provides less than optimal handling of the motor vehicle.
Various arrangements for compensating for oversteer and understeer of motor vehicles have been attained by relating the yaw behavior of the motor vehicle to the braking function. One particular arrangement involves the comparison of a vehicle yaw angular velocity required value and an actual vehicle yaw angular velocity of the motor vehicle. In such an arrangement, the required value and the actual yaw rate are measured, and the difference is minimized through the application of independent braking.
SUMMARY
A variable control steering actuator for mechanically adjusting an angle of the steerable wheels of a motor vehicle and a method for compensating for an oversteer or understeer condition in the operation of a motor vehicle are described herein. The variable control steering actuator includes a controller, a braking device in operable communication with the controller, and a clutch device associated with the braking device. The clutch device is disposed on an input pinion of the steering shaft. The input pinion is in operable mechanical communication with the steerable wheel through both the clutch device and the braking device.
The method for mechanically adjusting an angle of the steerable wheels of the motor vehicle in order to control the motor vehicle includes disengaging the clutch device disposed between the input pinion and the upper portion of the steering shaft and rotating the steering shaft independently of an input from an operator of the motor vehicle. The rotation of the steering shaft may be effectuated through a drive motor disposed in operable communication with the steering shaft and in informational communication with the controller.
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patent: 6148977 (2000-11-01), Backmak
patent: 6442469 (2002-08-01), Matsuno
Anderson Edmund P.
Delphi Technologies Inc.
Morris Lesley D.
Winner Tony
LandOfFree
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