Patent ID: 6729426
Filing Date: 2004-05-04
Classification: B60K,B60W

Abstract:
A driving force controlling apparatus for a four-wheel drive vehicle, comprising:main driven wheels which are one of front and rear road wheels; auxiliary driven wheels which are the other of the front and rear road wheels; a slip detecting section that detects an acceleration slip quantity of the main driven wheels; a driving force demand determining section that determines whether there is a vehicular driver's demand on the driving force; an auxiliary driven wheel driving force distribution rate maximum value updating section that calculates a driving force distribution ratio between the front and rear road wheels in such a manner that a driving force distribution rate for the auxiliary driven wheels is updated to a maximum value on the basis of the acceleration slip quantity of the main driven wheels detected by the slip detecting section when the driving force demand determining section determines that there is the vehicular driver's demand on the driving force; a slip responsive driving force distribution ratio calculating section that calculates the driving force distribution ratio between the front and rear road wheels in accordance with the acceleration slip quantity when the driving force demand determining section determines that there is no vehicular driver's demand on the driving force; and a driving force adjusting section that variably adjusts the driving force between the front and rear road wheels, wherein the driving force adjusting section adjusts the driving force based on the driving force distribution ratio between the front and rear road wheels calculated by at least one of the auxiliary driven wheel driving force distribution rate maximum value calculating section and the slip responsive driving force distribution ratio calculating section.