Fluid-pressure and analogous brake systems – Speed-controlled – Four-wheel drive or all wheel drive
Patent
1997-06-30
1999-01-19
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Four-wheel drive or all wheel drive
303186, B60T 862
Patent
active
058607102
ABSTRACT:
A method is provided to detect, without the use of G-sensors, possible cascade locking in a four-wheel drive vehicle equipped with wheel speed sensors. The method measures the speed of each wheel with the respective wheel-speed sensor, and derives an estimated vehicle speed and a front and rear speed difference between the front and rear wheel speeds from the wheel speeds. When the deceleration of the estimated vehicle speed is smaller than a first threshold value and the absolute value of the front and rear speed difference is larger than a second threshold value, and if the change in the speed of the front wheels is smaller than the change in the front and rear speed difference at a time when the absolute value of the difference diminishes, then cascade locking of the four wheels is deemed to be starting.
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Nisshinbo Industries Inc.
Oberleitner Robert J.
Schwartz Chris
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