Ford Global Technolgoies, LLC

Syun Kyung Lee

Ashok E Rodrigues

John Antoni Glab

Peter James Barrette

Dana Joseph Katinas

Todd Allen Brown

Richard David Bruns

Nancy Michelle Atkinson

A method for reducing oscillations in a vehicle driveline includes transmitting torque to secondary wheels of the vehicle, determining a first rate of change in speed between the secondary wheels and primary wheels, if a second rate of change in speed between secondary wheels and primary wheels is greater than the first rate of change, reducing torque transmitted to the secondary wheels proportional to a ratio of the first rate of change and the second rate of change, and if the second rate of change is less than the first rate of change, using differential and proportional control to change said torque.

Reducing oscillations in a motor vehicle driveline

A four wheel drive assemblyincluding a torque transfer assemblywhich operates under the control of the controllerand which receives and selectively transfers a certain desired amount of torque to a front axlesand to the rear axlesThe amount of transferred torque varies depending upon the occurrence of a sensed slip condition the use of a pre-emptive slip control mode of operation in which the controllerdetermines that it is likely that a slip may occur. Particularly, controlleris allowed to enter the preemptive mode of operation only after an actual slip has occurred and the controllerexits this preemptive mode of operation upon the occurrence of a certain event or condition or upon the passage of a certain amount of time.

Four wheel drive assembly and a method for utilizing the same

A method and apparatus for overcoming negative torque transfer in a passive coupling ( ) in a vehicle ( ) having all wheel drive. The vehicle ( ) includes a front driveshaft ( ), a rear driveshaft ( ), with the passive coupling ( ) connecting the front driveshaft ( ) and the rear driveshaft ( ). The vehicle ( ) also includes a transmission ( ) operatively connected to the passive coupling ( ). The method includes determining negative torque transfer in the passive coupling ( ) and requesting the vehicle ( ) to increase transmission output equal to the negative torque transfer.

Stability control throttle compensation on vehicles with passive all wheel drive systems

A method and system for controlling a transfer case of a four-wheel drive vehicle . The vehicle includes a front driveshaft and a rear driveshaft . Transfer case control system includes a conventional microcontroller or controller having a memory unit and operating under stored program control. Controller is communicatively coupled to sensors to a driver-operated control , and to a transfer case clutch . Controller operates transfer case in several modes including an automatic four-wheel drive mode and a &ldquo;locked&rdquo; four-wheel drive high mode. Controller estimates the amount of heat generated by clutch by monitoring the difference in the speed between driveshafts and and by monitoring the position of the vehicle's throttle. Controller automatically shifts from the automatic four-wheel drive mode to the locked four-wheel drive high mode when the estimated amount of heat exceeds a certain threshold level.

System and method for controlling an automatic four-wheel drive transfer case which prevents excessive slippage

A transfer case control system or apparatus is provided for use on a four-wheel drive vehicle of the type having a transfer case , a front driveshaft and a rear driveshaft . Transfer case control system includes a conventional microcontroller or controller having a memory unit and operating under stored program control. Controller is communicatively coupled to sensors , and to transfer case . Controller selectively transmits a torque control or minimum duty cycle signal to transfer case , which is at least partially based upon the angular position of the vehicle's steering wheel and the speed of driveshafts

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Ann Arbor, MI, United States of America

Syun Kyung Lee