Patent ID: 7451034
Filing Date: 2008-11-11
Classification: B60T

Abstract:
1. A method for controlling slip of a driven wheel of a motor vehicle comprising the steps of: (a) determining the current magnitude of static tire friction potential; (b) setting a lower magnitude of commanded tire force that is less than a current magnitude of static tire friction potential; (c) determining a current magnitude of maximum dynamic tire friction potential; (d) determining a magnitude of demanded tire torque; (e) using the magnitude of demanded tire torque and the current magnitude of maximum dynamic tire friction potential to set an upper magnitude of commanded tire force; (f) changing the magnitude of commanded tire force in a sequence of saw-tooth pulses, each pulse including a ramp of increasing magnitude of commanded tire force from the lower commanded tire force to the upper commanded tire force, the ramp having a predetermined slope, and a step in which the magnitude of commanded tire force is reduced following each ramp to the lower commanded tire force.