US 5,857,754 AGranted

Vehicle motion control system

AssigneeAisin Seiki Kabushiki Kaisha

InventorsMasanobu Fukami, Kenji Tozu, Yoshiyuki Yasui, Takayuki Itoh, Norio Yamazaki

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Abstract

The present invention is directed to a vehicle motion control system for maintaining vehicle stability by controlling the braking force applied to at least one of the driven wheels and non-driven wheels of a vehicle. A vehicle motion control is performed by applying the braking force to at least one wheel, on the basis of a condition of the vehicle in motion and irrespective of depression of a brake pedal. The braking force is applied to at least one wheel so as to cause an increase in turning radius, when an excessive oversteer occurs during vehicle motion. Whereas, the braking force is applied to at least one wheel so as to cause a decrease in turning radius, when an excessive understeer occurs during vehicle motion. In the case where an excessive braking to at least one of the driven wheels is detected, when an engine brake is exerted on the vehicle, a correction control is performed to increase the braking force applied to at least one of the non-driven wheels. For example, when an excessive slip rate of at least one of the driven wheels is detected, a desired slip rate of at least one of the non-driven wheels is corrected.

Claims7

Dependent claims

A vehicle motion control system for maintaining stability of an automotive vehicle when said vehicle in motion, by controlling a braking force applied to one of driven wheels and non-driven wheels of said vehicle, comprising:

vehicle condition monitor means for monitoring a condition of said vehicle in motion;
braking means for applying a braking force to each wheel of said vehicle, said braking means actuated in response to depression of a brake pedal, and said braking means actuated on the basis of an output of said monitor means and irrespective of depression of said brake pedal;
motion control means for actuating said braking means to apply the braking force to at least one of said wheels on the basis of the output of said monitor means and irrespective of depression of said brake pedal, said motion control means actuating said braking means to apply the braking force to at least one of said wheels so as to cause an increase in turning radius, when an excessive oversteer occurs during vehicle motion, and said motion control means actuating said braking means to apply the braking force to at least one of said wheels so as to cause a decrease in turning radius, when an excessive understeer occurs during vehicle motion;
excessive braking detection means for detecting an excessive braking to at least one of said driven wheels;
and
correction control means for controlling said motion control means to increase the braking force applied to at least one of said non-driven wheels, when said excessive braking detection means detects the excessive braking to the one of said driven wheels.

3 more elements

Dependencies are inferred from the claim text.