Integrated Electrohydraulic Brake Control Device for Automated Driving
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Solution Overview
Problem
Existing brake systems for motor vehicles, especially those designed for automated driving, face complexity and increased hydraulic connections which complicate the integration of additional electrohydraulic modules, leading to a higher number of connecting lines and potential mechanical adaptations issues.
Innovation Solution
A brake system design that integrates a second electrohydraulic brake control device downstream of the first, with a non-return valve connected in parallel to the outlet valve, allowing for unimpeded suction flow from the pressurizing-medium reservoir, reducing the need for additional hydraulic connections and simplifying the system's construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second electrohydraulic brake control device is integrated into the first brake control device, then the availability and functionality for automated driving is improved, but the number of hydraulic connections and system complexity increases
Solution Approach 1:
The patent merges the second electrohydraulic brake control device with the first brake control device into a single integrated unit. The second control device is positioned downstream of the first, sharing common hydraulic connections and structural elements. This integration allows both control devices to coexist within the same housing, reducing the overall number of external hydraulic connections while maintaining the functionality needed for both normal braking and automated driving operations.
2Adaptability or versatility
If additional hydraulic connections are provided for the second module, then the integration capability is improved, but the mechanical adaptation complexity and number of connecting lines increases
Solution Approach 1:
The integrated brake control device is designed with universal hydraulic connections that can serve multiple functions. The same hydraulic connections are used by both the first and second electrohydraulic control devices, allowing the system to adapt to different operating modes (normal braking, brake assist, automated driving) without requiring additional dedicated connections. This multi-functionality approach enables integration capability while avoiding the need for separate mechanical adaptation paths.
3Adaptability or versatility
If the second module is arranged at a spacing from the first brake control device, then the integration flexibility is improved, but the number of long connecting lines increases
Solution Approach 1:
The second electrohydraulic brake control device is nested within the same housing as the first brake control device, with the second device positioned downstream in an integrated arrangement. This nesting approach allows flexible positioning of the second module within the available space while keeping hydraulic connections short and compact. The integrated housing structure eliminates the need for long external connecting lines that would result from spacing the modules apart.
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 design simplifies the brake system construction by reducing hydraulic connections, enhancing system availability, and enabling seamless integration of autonomous driving features without compromising brake functionality, particularly by ensuring sufficient brake pressure can be maintained even in case of primary system failures.
Implementation Method 1
a non-return valve which opens in the direction of the first output pressure connection is connected in parallel with the outlet valve associated with the first output pressure connection
Data Source
AI summary
A brake system for vehicles, comprising hydraulically actuatable wheel brakes, a first electrohydraulic brake control device, having an associated pressure-medium. The first brake control device comprises a first pressure-providing device for supplying the wheel brakes. An inlet valve and an outlet valve for setting wheel-specific brake pressures, and a wheel-specific output pressure connection connected to the pressure-medium reservoir by the outlet valves. A second electrohydraulic brake control device, comprises a second pressure-providing device with a first pump having a suction side and a pressure side for supplying a first wheel brake of the wheel brakes. The second brake control device is connected downstream of the first brake control device and the suction side of the first pump is connected to a first of the output pressure connections of the first brake control device. A check valve is connected in parallel with the outlet valve of the first output pressure connection.