Roll rigidity controller of vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYuichi Mizuta
Life of this patent
Estimating the term…
Abstract
A target roll angle of the vehicle is computed based on an actual lateral acceleration at the centroid of the vehicle, and the lateral acceleration of the vehicle at the centroid is corrected by use of lateral acceleration correction amounts based on a yaw rate of the vehicle, whereby the lateral accelerations of the vehicle at the front wheel position and the rear wheel position are computed. Subsequently, target anti-roll moments at the front wheel position and the rear wheel position are computed based on the target roll angle and the accelerations of the vehicle at the front wheel position and the rear wheel position, and active stabilizer apparatuses of the front and rear wheels are controlled based on these target anti-roll moments.
Claims11
A roll rigidity control apparatus for a vehicle which includes roll rigidity changing means at a front wheel position or a rear wheel position, the apparatus comprising:
- lateral acceleration acquisition means for acquiring a lateral acceleration of the vehicle at the centroid thereof;
- yaw rate acquisition means for acquiring a yaw rate of the vehicle about the centroid;
- lateral acceleration computation means for computing a lateral acceleration of the vehicle at the front wheel position or the rear wheel position on the basis of the lateral acceleration, the yaw rate, a yaw inertial moment of the vehicle, a vehicle speed coefficient based on a vehicle speed, and the rear wheel position or the front wheel position, respectively, measured along a front-rear direction of the vehicle;
- and
- control means for computing a target anti-roll moment at the front wheel position or the rear wheel position on the basis of the lateral acceleration of the vehicle at the front wheel position or the rear wheel position, correspondingly, and controlling the roll rigidity changing means at the front wheel position or the rear wheel position on the basis of the target anti-roll moment at the front wheel position or the rear wheel position, correspondingly
- wherein the vehicle speed coefficient is between 0 and 1, the vehicle speed coefficient equals 0 when the vehicle speed is less than a first reference value, the vehicle speed coefficient equals 1 when the vehicle speed is greater than a second reference value, and the vehicle speed coefficient increases with the vehicle speed when the vehicle speed is greater than the first reference value and less than the second reference value.
A roll rigidity control apparatus for a vehicle which includes roll rigidity changing means at a front wheel position or a rear wheel position, the apparatus comprising:
- lateral acceleration acquisition means for acquiring a lateral acceleration of the vehicle at the centroid thereof;
- yaw rate acquisition means for acquiring a yaw rate of the vehicle about the centroid;
- lateral acceleration computation means for computing a lateral acceleration of the vehicle at the front wheel position or the rear wheel position on the basis of the lateral acceleration and the yaw rate;
- and
- control means for computing a target anti-roll moment at the front wheel position or the rear wheel position on the basis of the lateral acceleration of the vehicle at the front wheel position or the rear wheel position, correspondingly, and controlling the roll rigidity changing means at the front wheel position or the rear wheel position on the basis of the target anti-roll moment at the front wheel position or the rear wheel position, correspondingly,
- wherein the vehicle includes the roll rigidity changing means at each of the front wheel position and the rear wheel position;
- the lateral acceleration computation means computes lateral accelerations of the vehicle at the front wheel position and the rear wheel position on the basis of the lateral acceleration and the yaw rate;
- and the control means computes target anti-roll moments at the front wheel position and the rear wheel position on the basis of the lateral accelerations of the vehicle at the front wheel position and the rear wheel position, respectively, and controls the roll rigidity changing means at the front wheel position and the rear wheel position on the basis of the target anti-roll moments at the front wheel position and the rear wheel position, respectively,
- wherein the control means computes a target roll angle of the vehicle on the basis of at least the lateral acceleration of the vehicle at the centroid;
- computes, on the basis of the lateral acceleration of the vehicle at the front wheel position and a previously set front-rear distribution ratio of roll rigidity, the target anti-roll moment at the front wheel position which renders a roll angle of the vehicle coincident with the target roll angle;
- and computes, on the basis of the lateral acceleration of the vehicle at the rear wheel position and the previously set front-rear distribution ratio of roll rigidity, the target anti-roll moment at the rear wheel position which renders the roll angle of the vehicle coincident with the target roll angle.
Dependencies are inferred from the claim text.