Brake system for a motor vehicle and method for controlling the same
AssigneeRobert Bosch GmbH
InventorsHerbert Vollert, Reinhard Weiberle
Life of this patent
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Abstract
The invention relates to a hybrid brake system having a hydraulic service brake system and an electromechanical service brake system. According to the invention, a brake booster is designed as a pedal simulator, which can be used to boost power and to generate a pedal power which is counter to the direction of actuation. When the hydraulic service brake system fails, the electromechanical service brake system is used for braking and the brake booster generates a pedal power which allows or facilitates dosage of the brake actuation.
Claims15
A motor vehicle brake system, which includes a hydraulic service brake system and an additional service brake system, the hydraulic service brake system having a muscular force-actuatable master cylinder with a brake booster and one or more hydraulic wheel brakes that are connected to the master cylinder, the brake booster configured to produce a pedal force that counteracts an actuation force, wherein said brake booster includes;
- a push rod operable to actuate the master cylinder;
- a pedal rod connected to a muscular force-actuatable brake pedal and operable to apply an actuation force to said push rod upon actuation of the brake pedal;
- an actuator selectively engageable to produce the pedal force by engagement to a selected one of said pedal rod and said push rod;
- and
- a motor coupled to said actuator and operable to drive said actuator toward said pedal rod when said actuator is engaged to one of said pedal rod and said push rod, thereby applying a force on said pedal rod that counteracts the actuation force.
A method for controlling a motor vehicle brake system, which includes a hydraulic service brake system and an additional service brake system, the hydraulic service brake system having a muscular force-actuatable master cylinder with a brake booster and one or more hydraulic wheel brakes that are connected to the master cylinder, the brake booster including a push rod operable to actuate the master cylinder and a pedal rod connected to a muscular-force actuated brake pedal operable to apply an actuation force to the push rod, the method comprising the steps of:
- measuring a brake actuation travel of the brake pedal via an actuation sensor system;
- comparing the actuation force to an expected actuation force for the brake actuation travel;
- and
- if the actuation force achieved during the actuation travel is less than the expected actuation force, producing a pedal force that counteracts the actuation force via the brake booster.
Dependencies are inferred from the claim text.