Method for enhancing vehicle stability
First Claim
1. A method of enhancing vehicle response and stability in a vehicle having an active roll control system with front and rear suspensions each including an anti-roll bar, and the control system being capable of providing an anti-roll moment on the vehicle which may be proportioned between the front and rear anti-roll bars, the method comprising:
- a) determining the vehicle speed;
b) determining the steering wheel angle;
c) calculating the desired vehicle yaw rate based upon the determined speed and steering wheel angle;
d) sensing the actual yaw rate;
e) comparing the desired yaw rate to the actual yaw rate;
f) increasing the percentage of the anti-roll moment provided to the rear anti-roll bar if the actual yaw rate is less than the desired yaw rate, thereby decreasing understeer, increasing yaw rate, and enhancing vehicle response; and
g) increasing the percentage of the anti-roll moment provided to the front anti-roll bar if the actual yaw rate is greater than the desired yaw rate, thereby increasing understeer, decreasing yaw rate, and enhancing vehicle stability.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of enhancing vehicle stability and response in a vehicle having an active roll control system with front and rear suspensions each including an anti-roll bar, and the control system including a hydraulic system for providing an anti-roll moment which acts on the vehicle by means of hydraulic cylinders connected to the anti-roll bars, includes the following steps: a) determining the vehicle speed; b) determining the steering wheel angle; c) calculating the desired vehicle yaw rate based upon the determined speed and steering wheel angle; d) sensing the actual yaw rate; e) comparing the desired yaw rate to the actual yaw rate; f) increasing the percentage of the anti-roll moment provided to the rear anti-roll bar if the actual yaw rate is less than the desired yaw rate, thereby decreasing understeer, increasing yaw rate, and enhancing vehicle response; and g) increasing the percentage of the anti-roll moment provided to the front anti-roll bar if the actual yaw rate is greater than the desired yaw rate, thereby increasing understeer, decreasing yaw rate, and enhancing vehicle stability. The anti-roll moment distribution is further adjusted for steering precision enhancement.
-
Citations
6 Claims
-
1. A method of enhancing vehicle response and stability in a vehicle having an active roll control system with front and rear suspensions each including an anti-roll bar, and the control system being capable of providing an anti-roll moment on the vehicle which may be proportioned between the front and rear anti-roll bars, the method comprising:
-
a) determining the vehicle speed; b) determining the steering wheel angle; c) calculating the desired vehicle yaw rate based upon the determined speed and steering wheel angle; d) sensing the actual yaw rate; e) comparing the desired yaw rate to the actual yaw rate; f) increasing the percentage of the anti-roll moment provided to the rear anti-roll bar if the actual yaw rate is less than the desired yaw rate, thereby decreasing understeer, increasing yaw rate, and enhancing vehicle response; and g) increasing the percentage of the anti-roll moment provided to the front anti-roll bar if the actual yaw rate is greater than the desired yaw rate, thereby increasing understeer, decreasing yaw rate, and enhancing vehicle stability. - View Dependent Claims (2)
-
-
3. A method of enhancing steering precision in a vehicle having an active roll control system with front and rear suspensions each including an anti-roll bar, and the control system being capable of providing an anti-roll moment on the vehicle which may be proportioned between the front and rear anti-roll bars, the method comprising:
-
determining the vehicle speed; determining the steering wheel angle; calculating the desired vehicle yaw rate based upon the determined speed and steering wheel angle; sensing the actual yaw rate; comparing the desired yaw rate to the actual yaw rate to determine a difference therebetween; multiplying the difference by a gain factor to generate an error signal indicative of steering precision adjustment; and adjusting the distribution of anti-roll moment between the front and rear anti-roll bars based upon the error signal, thereby adjusting understeer and yaw rate and enhancing steering precision. - View Dependent Claims (4)
-
-
5. A method of enhancing vehicle stability and steering precision in a vehicle having an active roll control system with front and rear suspensions each including an anti-roll bar, and the control system being capable of providing an anti-roll moment on the vehicle which may be proportional between the front and rear anti-roll bars, the method comprising:
-
determining the vehicle speed; determining the vehicle steering wheel angle; calculating the desired vehicle yaw rate based upon the determined speed and steering wheel angle; sensing the actual yaw rate; comparing the desired yaw rate to the actual yaw rate to determine a difference therebetween; increasing the percentage of the anti-roll moment provided to the rear anti-roll bar if the actual yaw rate is less than the desired yaw rate, thereby decreasing understeer and increasing yaw rate; increasing the percentage of the anti-roll moment provided to the front anti-roll bar if the actual yaw rate is greater than the desired yaw rate, thereby increasing understeer and decreasing yaw rate; multiplying the difference by a gain factor to generate an error signal indicative of steering precision adjustment; and adjusting the distribution of anti-roll moment between the front and rear anti-roll bars based upon the error signal, thereby further adjusting understeer and yaw rate and enhancing steering precision. - View Dependent Claims (6)
-
Specification