ANTI-LOCK BRAKING SYSTEM CONTROLLER FOR ADJUSTING SLIP THRESHOLDS ON INCLINES
First Claim
1. A method of operating a vehicle anti-lock braking system including a brake pedal and a brake modulator that reduces braking pressure by a initial pressure reduction after detecting insipient wheel lock, comprising:
- measuring vehicle deceleration as a function of brake pedal position;
updating a first table with said vehicle deceleration and said brake pedal position;
estimating a coefficient of friction of a road surface based on said first table; and
estimating a slip target for at least one wheel that is based on an estimated maximum slip of said at least one wheel before losing traction minus an estimated potential for vehicle rollover.
12 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for operating a vehicle anti-lock braking system includes a brake pedal and a brake modulator that reduces braking pressure by an initial pressure reduction after detecting insipient wheel lock. Vehicle deceleration is measured as a function of brake pedal position. A first table is updated with the vehicle deceleration and the brake pedal position. A coefficient of friction of a road surface is estimated based on the first table. A slip target for at least one wheel is estimated and is based on an estimated maximum slip of the at least one wheel before losing traction minus an estimated potential for vehicle rollover. A deceleration target for at least one wheel is estimated and is based on an estimated maximum deceleration of the at least one wheel before losing traction minus the estimated potential for vehicle rollover.
-
Citations
20 Claims
-
1. A method of operating a vehicle anti-lock braking system including a brake pedal and a brake modulator that reduces braking pressure by a initial pressure reduction after detecting insipient wheel lock, comprising:
-
measuring vehicle deceleration as a function of brake pedal position;
updating a first table with said vehicle deceleration and said brake pedal position;
estimating a coefficient of friction of a road surface based on said first table; and
estimating a slip target for at least one wheel that is based on an estimated maximum slip of said at least one wheel before losing traction minus an estimated potential for vehicle rollover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A vehicle anti-lock braking system, comprising:
-
a brake pedal;
a brake modulator; and
a controller that communicates with said brake modulator and that measures vehicle deceleration as a function of brake pedal position, updates a first table with said vehicle deceleration and said brake pedal position, estimates a coefficient of friction of a road surface based on said first table, and estimates a slip target for at least one wheel that is based on an estimated maximum slip of said at least one wheel before losing traction minus an estimated potential for vehicle rollover. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification