Hydraulic Brake System Decoupling for Automated Pressure Control
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Solution Overview
Problem
Current hydraulic brake systems require driver input for braking and lack efficient mechanisms for individually adjusting wheel brake pressures, leading to suboptimal control and comfort during external braking operations like automatic emergency braking.
Innovation Solution
The method involves decoupling the master brake cylinder from the brake medium reservoir, using a sealing element and a plunger to adjust wheel brake pressures independently, allowing for silent and unnoticed pressure changes, and integrating an electromechanical brake booster for cost-effective and space-efficient control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the master brake cylinder remains connected to the brake medium reservoir, then brake medium can be compensated for pressure changes, but pressure cannot be individually adjusted in wheel brake cylinders without driver input
Solution Approach 1:
The brake system is segmented into independent wheel brake cylinder circuits that can be individually controlled. The master brake cylinder is decoupled from the brake medium reservoir via sealing elements, creating isolated pressure zones for each wheel that can be independently adjusted by brake medium delivery elements without requiring driver input.
Solution Approach 2:
A sealing element acts as an intermediary between the master brake cylinder and the brake medium reservoir, preventing brake medium displacement while allowing independent pressure control. The brake medium delivery element serves as an intermediary mechanism to deliver precise brake medium volumes to individual wheel brake cylinders.
2Extent of automation
If brake pressure is actively built up in wheel brake cylinders, then external power braking is achieved, but driver may notice pedal pull-in or reaction
Solution Approach 1:
The sealing element extracts or isolates the master brake cylinder from the brake medium reservoir, preventing the driver from perceiving pedal reactions during active pressure build-up. This decoupling removes the harmful feedback path that would otherwise transmit pressure changes to the driver through the brake pedal.
Solution Approach 2:
The sealing element serves as a mediator that blocks the transmission of pressure reactions from the wheel brake cylinders back to the master brake cylinder and brake pedal, allowing automated pressure build-up without driver perception of the action.
3Adaptability or versatility
If the master brake cylinder is decoupled from the brake medium reservoir, then independent wheel pressure control is enabled, but brake medium displacement for pressure compensation is prevented
Solution Approach 1:
The sealing element provides multiple functions: it decouples the master brake cylinder from the reservoir to enable independent pressure control, prevents brake medium displacement, and maintains system integrity. The brake medium delivery element serves both to deliver brake medium to wheels and to manage pressure balance without requiring additional compensation mechanisms.
4Extent of automation
If conventional brake systems are used, then driver braking force is required for all braking operations, but automated braking functions cannot be implemented
Solution Approach 1:
The brake system performs self-service through automated pressure control. The control device independently manages brake medium delivery to wheel brake cylinders without requiring driver input for automated braking functions. The system serves itself by detecting braking requirements and executing pressure adjustments autonomously.
Solution Approach 2:
The manual mechanical braking system is replaced with an automated electro-hydraulic system. The brake medium delivery elements and control device substitute for the driver's mechanical braking force, using electronic control signals to activate hydraulics for automated braking operations.
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
Enables independent adjustment of wheel brake pressures without driver input, improving comfort and control during external braking operations by eliminating noticeable pedal changes and reducing noise and vibration, thus enhancing driving experience and system interaction.
Implementation Method 1
the at least one sealing element is moved into a sealing position in relation to the at least one connecting channel
Implementation Method 2
an actual brake medium volume corresponding to the specified target delivery variable is delivered between at least one plunger storage chamber as at least one storage volume and a volume external to the storage of the at least one brake circuit
Data Source
AI summary
The invention relates to a method for operating a hydraulic brake system of a vehicle, comprising the following steps: receiving a specification (14) provided by a control system of the vehicle in regard to a target pressure change in at least one wheel brake cylinder (64a - 64d) of the hydraulic brake system (S1) connected to a master brake cylinder (50) by means of at least one brake circuit (62a, 62b); moving at least one sealing element (22) to a sealing position with respect to at least one connecting channel (54) of the master brake cylinder (50) to a brake medium reservoir (52) of the hydraulic brake system; determining a target delivery variable (32) for at least one brake medium delivery element (30, 88a, 88 ' a, 88b, 90) of the hydraulic brake system for delivering a brake medium volume between at least one store volume (100) of the hydraulic brake system and a volume of the at least one brake circuit external to the store taking into consideration the received specification (14) (S3); and controlling the at least one brake medium delivery element (30, 88a, 88 ' a, 88b, 90) according to the determined target delivery variable (32) (S4). The invention further relates to a control device by means of which the method is performed.