Method for controlling a hydraulic brake system of a motor vehicle
AssigneeFord Global Technologies, LLC
InventorThomas Svensson
Life of this patent
Estimating the term…
Abstract
A method of controlling a brake system of a motor vehicle having a braking assistance function. The brake system including a master brake cylinder, activated with a brake pedal. A distance s between a valve piston connected to the brake pedal, and a transmission element, connected to a pressure piston of the master brake cylinder is sensed and the brake system is controlled as a function of the sensed distance s. Within the scope of this monitoring process, brake pedal release is detected even when the pressure-generating unit is activated. In addition, despite an active braking assistance function, consistent interplay occurs between activation by the driver and assistance-side activation of the brakes given satisfactory pedal feedback.
Claims15
A method for controlling a hydraulic brake system comprising:
- providing a master brake cylinder having a pressure piston and a reaction disk engaging the pressure piston;
- providing a valve body, said valve body contacting said reaction disk and a valve piston, said valve piston moving independent of and relative to said valve body, said valve piston continually separated and spaced from said reaction disk at some distance s wherein the distance s is sensed, said valve piston engaging said reaction disk only through said valve body;
- wherein activation of a brake assist system changes the distance s to a value different from an initial value s0 occurring in a non-activated state of the brake pedal;
- and
- controlling brake pressure in the brake system as a function of the sensed distance s and initial value s0.
A method for controlling a hydraulic brake system of a motor vehicle having a braking assistance function comprising:
- providing a master brake cylinder having a pressure piston and a transmission element connected to the pressure piston;
- providing a brake booster having a valve piston and a valve body, said valve body engaging said transmission element;
- providing a continuous and uninterrupted space extending from said valve piston to said transmission element wherein said valve piston is continually separated and spaced from said transmission element at some distance s apart from one another;
- determining a distance s0 between the valve piston and the transmission element;
- comparing the distance s between the valve piston and the transmission element with the distance s0;
- and
- moving said valve body of said brake booster to increase brake pressure corresponding to the comparison between the distance s and the distance s0 wherein the brake system is controlled as a function of the sensed distance s.
A hydraulic brake system comprising:
- a master brake cylinder including a pressure piston;
- a brake booster including a valve body and a valve piston;
- a transmission element disposed between said valve body and said pressure piston;
- an uninterrupted space extending at a distance s from said transmission element to said valve piston;
- and
- at least one sensor for sensing the distance s.
Dependencies are inferred from the claim text.