Hydraulic Brake Booster with Integrated Piston for Feedback
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Solution Overview
Problem
The existing hydraulic vehicle brake systems lack driver feedback and are not compact or lightweight, with hydraulic boosters failing to provide adequate force enhancement.
Innovation Solution
A hydraulic vehicle brake system with a plate-shaped actuation piston and a control piston that allows two-stage throttling between the boosting and return flow chambers, providing feedback through pressure buildup and incorporating a spring-prestressed actuation piston for compact design and adjustable feedback, along with a nonreturn valve for mechanical fallback and an electrically driven pump for electrical fallback in heavy vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydraulic booster is used to enhance braking force, then the braking force is improved, but driver feedback becomes insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the control piston is guided in the working piston such that pressure buildup in the boosting chamber acts on the activation side as feedback for the driver. This allows the driver to perceive the braking force application while still receiving hydraulic assistance, resolving the contradiction between force enhancement and feedback provision.
2Force
If a traditional hydraulic booster design is used, then braking force is provided, but the system becomes bulky and heavy
Solution Approach 1:
The patent merges the control piston and working piston into a single integrated piston unit with a multi-component structure. The control piston is guided within the working piston, combining two separate components into one, which reduces the overall size and weight of the booster while maintaining its force-enhancing function.
3Weight of stationary object
If a compact booster design is implemented, then weight and size are reduced, but adjusting feedback and boosting factors becomes difficult
Solution Approach 1:
The patent employs a multi-component piston unit where the control piston and working piston can be configured with variable face areas. This dynamic configuration allows the feedback and boosting factors to be adjusted according to different customer requirements while maintaining a compact overall design, as the adjustability is achieved through component geometry rather than additional mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system offers improved driver feedback, compact design, and adjustable boosting factors, ensuring reliable braking with both mechanical and electrical fallback options, enhancing the overall performance and safety of the brake system.
Implementation Method 1
the actuation piston is provided prestressed against a stop by means of a spring element in the force outputting direction
Implementation Method 2
a hydraulic pressure of a hydraulic pressure source can be applied to the booster via an inlet for the purpose of boosting braking force
Implementation Method 3
two-stage throttling of the volume flow between the boosting chamber and the return flow chamber is made possible in order to build up pressure in the boosting chamber
Data Source
AI summary
A hydraulic vehicle brake system, which has a brake pressure signal generator which can be activated by a brake activation device, wherein the brake pressure signal generator can be connected to wheel brakes of the vehicle via at least one hydraulic line and is composed essentially of a master brake cylinder and a hydraulic booster which is connected upstream and which has a return flow chamber and a boosting chamber, a working piston arranged therein and a control piston, wherein the working piston is operatively connected in the force outputting direction to a master brake cylinder piston via an activation element, and a hydraulic pressure of a hydraulic pressure source can be applied to the booster via an inlet for the purpose of boosting braking force, wherein an outlet of the booster can be connected to a reservoir vessel.