Method for venting of hydraulic brake system of vehicle and brake system controller

Abstract

The invention provides a method for exhaust of at least one part of a hydraulic brake system of a vehicle. The brake system comprises at least one brake circuit. The pressure of the brake circuit can be selectively increased through at least one motor propelled pump (14a,14b), especially an ESC pump. Under the condition that an exhaust valve is not opened, a given period for increased pressure can be applied to the partial brake system for exhaust through the pump (14a,14b).

Description

technical field [0001] The present invention relates to a method and a brake system controller for venting at least a portion of a hydraulic brake system of a vehicle, wherein the brake system comprises at least one brake circuit via at least one electric motor driven pump device, the brake circuit Pressure can be selectively increased. Background technique [0002] Proper venting of hydraulic braking systems used in vehicles, especially automobiles, is known to be very important. Air bubbles remaining in the system are compressed when the brake pressure increases, leading to an elastic behavior of the brake transmission path and thus to an increased pedal actuation travel, which is perceived by the driver as a nuisance and in extreme cases constitutes Security Risk. [0003] For various reasons, a perfect gas-free filling of the brake system cannot always be guaranteed, especially during the first filling of the brake system with hydraulic fluid during vehicle production....

AI Technical Summary

Problems solved by technology

Air bubbles remaining in the system are compressed when the brake pressure increases, leading to an elastic behavior of the brake transmission path and thus to an increased pedal actuation travel, which is perceived by the driver as a nuisance and in extreme cases constitutes Security Risk

[0003] For various reasons, a perfect air-free filling of the brake system cannot always be guaranteed, especially during the first filling of the brake system with hydraulic fluid during vehicle production

Even if the safety-critical threshold is not exceeded, this will lead to abnormally long pedal actuation travel and thus driver discomfort, which can lead to a period of time in the workshop, which should generally be avoided for new cars

[0004] However, the traditional venting process relies on introducing hydraulic fluid from a pressure source at one point in the brake system, opening one or more vent valves at other points, and then enforcing fluid flow until the vent valves no longer emit air bubbles , the process is relatively costly, and therefore, based on time and cost considerations, such a venting process is not practical as a necessary step in vehicle production

Images