Vehicle handling control method for antilock braking
First Claim
1. In a vehicle having an antilock brake system, a method of enhancing cornering ability during antilock brake operation comprising the steps of:
- measuring vehicle deceleration;
determining a wheel slip of each wheel;
sensing an amount of steering wheel rotation and calculating the rate of said steering wheel rotation;
calculating for each wheel a peak slip value which can generate the highest amount of surface adhesion;
calculating a cornering term for each wheel as a function of said steering wheel rotation;
calculating an evasive term as a function of said calculated rate of said steering wheel rotation and said measured vehicle deceleration;
calculating a target slip value of each wheel as a function of the evasive term, the cornering term and the peak slip value; and
regulating each wheel to the respective target slip value.
12 Assignments
0 Petitions
Accused Products
Abstract
An algorithm is provided for improved lateral force during cornering while in antilock braking mode. For each wheel, the peak slip value at which maximum adhesion between tire and road occurs is determined, and the peak value is reduced by offsets (or factors) to increase lateral force according to the cornering maneuver in progress to derive a target slip value. A cornering offset and an evasive offset are functions of steering wheel angle and steering wheel rotation rate, respectively, and of vehicle deceleration. When slip is determined using average vehicle speed, a geometry correction term which is a function of steering angle, vehicle speed and deceleration is added to the target value. The offsets and the correction term have different values for inside and outside wheels.
-
Citations
15 Claims
-
1. In a vehicle having an antilock brake system, a method of enhancing cornering ability during antilock brake operation comprising the steps of:
-
measuring vehicle deceleration; determining a wheel slip of each wheel; sensing an amount of steering wheel rotation and calculating the rate of said steering wheel rotation; calculating for each wheel a peak slip value which can generate the highest amount of surface adhesion; calculating a cornering term for each wheel as a function of said steering wheel rotation; calculating an evasive term as a function of said calculated rate of said steering wheel rotation and said measured vehicle deceleration; calculating a target slip value of each wheel as a function of the evasive term, the cornering term and the peak slip value; and regulating each wheel to the respective target slip value. - View Dependent Claims (2, 3)
-
-
4. In a vehicle having an antilock brake system, a method of enhancing cornering ability during antilock brake operation comprising the steps of;
-
measuring vehicle deceleration; determining a wheel slip of each wheel; sensing an amount of steering wheel rotation and calculating the rate of said steering wheel rotation; calculating for each wheel a peak slip value which can generate the highest amount of surface adhesion; calculating a cornering offset for each wheel as a function of said steering wheel rotation; calculating an evasive offset as a function of said calculated rate of said steering wheel rotation and said measured vehicle deceleration; calculating a target slip value of each wheel as the sum of the evasive offset, the cornering offset and the peak slip value; and regulating each wheel to the respective target slip value. - View Dependent Claims (5, 6, 7, 8, 9, 10)
-
-
11. In a vehicle having an antilock brake system, a method of enhancing cornering ability during antilock brake operation comprising the steps of:
-
measuring vehicle deceleration; determining a wheel slip of each wheel; sensing an amount of steering wheel rotation and calculating the rate of said steering wheel rotation; calculating for each wheel a peak slip value which can generate the highest amount of surface adhesion; calculating a cornering reduction ratio for each wheel as a function of said steering wheel rotation, calculating an evasive reduction ratio as a function of said calculated rate of said steering wheel rotation and said measured vehicle deceleration; calculating a target slip value of each wheel as the product of the evasive reduction ratio, the cornering reduction ratio and the peak slip value; and regulating each wheel to the respective target slip value. - View Dependent Claims (12, 13, 14, 15)
-
Specification