Four-wheel drive transfer case controller with compensation for

Details Four-wheel drive transfer case controller with compensation for Four-wheel drive transfer case controller with compensation for

1994-12-09

1998-09-15

Louis-Jacques, Jacques

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Control of power distribution between vehicle axis or wheels

701 74, 701 89, 701 90, 180197, 180233, 180248, 303147, G06F 770

Patent

active

058094431

ABSTRACT:
A four-wheel drive vehicle includes a transfer case for controlling the delivery of power between the front and rear wheels of the vehicle. A clutch in the transfer case controls the amount of power delivered to the front and rear wheels in response to a clutch PulseWidth Modulated (PWM) signal which is generated by an electronic powertrain controller. The powertrain controller receives a first signal which is indicative of the rotational speed of a front driveshaft, which transfers motive power from the transfer case to a pair of front wheels, and a second signal which is indicative of the rotational speed of a rear driveshaft, which transfers motive power from the transfer case to a pair of rear wheels. The powertrain controller compensates for wheels which have a different effective diameter by determining the difference between the first signal and the second signal, filtering the difference to remove low frequency components, and generating the clutch PWM signal as a function of the high frequency components.

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