Vehicle dynamics control system
First Claim
1. A vehicle dynamics control system for a four-wheel-drive vehicle employing a brake control system regulating braking forces applied to road wheels independently of each other and a differential mechanism controlling a differential motion between front and rear wheel axles, comprising:
- a braking-force compensation section that compensates for a braking force of at least one of a first wheel, which is subjected to vehicle dynamics control, and a second wheel to which a transferred braking force substantially corresponding to the braking force applied to the first wheel is transferred from the first wheel through the differential mechanism, to reduce a braking force of the second wheel by an excess of the braking force of the second wheel over a lateral grip limit of the second wheel during the vehicle dynamics control;
a turning-behavior state variable detection section that detects a state variable of turning behavior of the vehicle;
a control section that controls a braking force applied to each of the road wheels so that the state variable of turning behavior is brought closer to a desired value;
a braking-force application device that applies a braking force to each of the road wheels, which is produced by a driver'"'"'s brake-pedal depression;
whereinthe braking-force compensation section reduces the braking force of the second wheel, on which the transferred braking force acts, to prevent a sum of the braking force applied to the second wheel, produced by the driver'"'"'s brake-pedal depression, and the transferred braking force, transferred from the first wheel via the differential mechanism to the second wheel, from exceeding a lateral grip limit of the second wheel, in presence of the driver'"'"'s brake-pedal depression during the vehicle dynamics control.
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Accused Products
Abstract
In a vehicle dynamics control (VDC) system for a four-wheel-drive vehicle employing a brake control system regulating braking forces applied to road wheels independently of each other and a differential mechanism controlling a differential motion between front and rear wheel axles, a VDC controller controls a braking force of each road wheel depending on whether the vehicle is in oversteering or understeering. The VDC controller includes a braking-force compensation section that compensates for a braking force of at least one of a first wheel, which is subjected to vehicle dynamics control, and a second wheel to which a transferred braking force is transferred from the first wheel through the differential mechanism, to reduce a braking force of the second wheel and to prevent the braking force of the second wheel from exceeding a lateral grip limit of the second wheel during the vehicle dynamics control.
25 Citations
12 Claims
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1. A vehicle dynamics control system for a four-wheel-drive vehicle employing a brake control system regulating braking forces applied to road wheels independently of each other and a differential mechanism controlling a differential motion between front and rear wheel axles, comprising:
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a braking-force compensation section that compensates for a braking force of at least one of a first wheel, which is subjected to vehicle dynamics control, and a second wheel to which a transferred braking force substantially corresponding to the braking force applied to the first wheel is transferred from the first wheel through the differential mechanism, to reduce a braking force of the second wheel by an excess of the braking force of the second wheel over a lateral grip limit of the second wheel during the vehicle dynamics control; a turning-behavior state variable detection section that detects a state variable of turning behavior of the vehicle; a control section that controls a braking force applied to each of the road wheels so that the state variable of turning behavior is brought closer to a desired value; a braking-force application device that applies a braking force to each of the road wheels, which is produced by a driver'"'"'s brake-pedal depression;
whereinthe braking-force compensation section reduces the braking force of the second wheel, on which the transferred braking force acts, to prevent a sum of the braking force applied to the second wheel, produced by the driver'"'"'s brake-pedal depression, and the transferred braking force, transferred from the first wheel via the differential mechanism to the second wheel, from exceeding a lateral grip limit of the second wheel, in presence of the driver'"'"'s brake-pedal depression during the vehicle dynamics control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification