Vehicle Brake System Parking Brake Load Isolation
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Solution Overview
Problem
Vehicle brake systems with combined hydraulic and electromechanical actuation face high collective load during parking brake activation, leading to overloading of components, particularly during the release of the parking brake function.
Innovation Solution
The control device isolates the hydraulic volume acting on the disk brake device before activating the parking brake function, allowing the hydraulic pressure to decrease as the electromechanical actuating device takes over, reducing the collective load and eliminating the need for hydraulic assistance during release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic preloading is maintained during parking brake activation, then the electromechanical actuating device requires lower power, but the collective load upon activation becomes excessively high causing component overloading
Solution Approach 1:
The control device isolates the hydraulic volume before activating the electromechanical actuating device, preparing the system in advance to prevent excessive collective load during activation while still allowing hydraulic assistance during the braking process
2Force
If hydraulic preloading is maintained during parking brake activation, then brake application force is enhanced, but the release of parking brake becomes more complex requiring hydraulic assistance
Solution Approach 1:
By isolating the hydraulic volume before activation, the system prepares the hydraulic pressure state in advance, allowing the electromechanical device to handle both application and release without requiring complex hydraulic assistance mechanisms during release
3Reliability
If the electromechanical actuating device is designed for high load rating, then reliability during parking brake activation is improved, but device complexity and size increase
Solution Approach 1:
The control device isolates the hydraulic volume in advance before activation, preparing the system to reduce collective load during electromechanical activation, thereby allowing the use of less powerful and simpler electromechanical components while maintaining reliability
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
This approach reduces the complexity and power requirements of the electromechanical actuating device, preventing overloading and allowing for simpler, less elaborate release of the parking brake function, as the braking forces are primarily electromechanically generated.
Implementation Method 1
a hydraulic volume which is currently acting in order to produce a hydraulic pressure that causes a service brake action
Implementation Method 2
an electromechanical actuating device for activating a parking brake function
Implementation Method 3
a friction lining arrangement comprising two opposing friction linings on either side of a brake disk
Data Source
AI summary
A vehicle brake system, comprising a hydraulically controllable disk brake device, which has an electromechanical actuating device for activating a parking brake function, wherein the vehicle brake system has a hydraulic circuit having a hydraulic pressure source and controllable hydraulic functional elements in order to hydraulically control the disk brake device according to a service brake action of a driver or according to an automatic activation of a driving assistance system, wherein the vehicle brake system further comprises a control device in order to control the electromechanical actuating device according to a parking brake action of the driver or according to an automatic activation of the parking brake function. In order to avoid overload states the control device is designed to control at least one of the hydraulic functional elements in such a way that, before the parking brake function is activated by controlling the electromechanical actuating device, a hydraulic volume currently acting on the disk brake device in order to produce a hydraulic pressure that causes a service brake action can be hydraulically isolated.