Dual Axle Brake System Segmentation and Data Link
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Solution Overview
Problem
Dual circuit-type motor vehicle brake systems face challenges in ensuring controlled deceleration when one circuit fails, particularly in the absence of a common master brake cylinder and with complex hydraulic line configurations, which can lead to inefficiencies and space constraints.
Innovation Solution
A brake system with two independent hydraulic brake devices, each controlling a motor vehicle axle, communicates through a data channel to enable autonomous pressure buildup and control, eliminating the need for a common master brake cylinder and reducing hydraulic line complexity, while allowing for ABS and ESP functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common master brake cylinder is used in dual circuit brake systems, then the system structure is simplified, but the space requirements increase and hydraulic line complexity increases
Solution Approach 1:
The brake system is divided into two independent hydraulic brake devices, each with its own master brake cylinder and control unit. The first hydraulic brake device controls wheels on a first axle, while the second hydraulic brake device controls wheels on a second axle. This segmentation eliminates the need for a shared master brake cylinder and complex hydraulic line configurations, reducing overall space requirements while maintaining dual-circuit safety.
2Device complexity
If hydraulic lines connect both axles through a common system, then braking force distribution is simplified, but the hydraulic line complexity and space requirements increase
Solution Approach 1:
The hydraulic system is segmented into two independent circuits: the first hydraulic brake device with its own master brake cylinder and hydraulic lines for the first axle, and the second hydraulic brake device with its own master brake cylinder and hydraulic lines for the second axle. This eliminates the need for long hydraulic lines spanning between axles, reducing space requirements and hydraulic line complexity.
3Reliability
If control units are fully independent without communication, then system reliability increases, but coordination between axles deteriorates
Solution Approach 1:
The first control unit and second control unit are coupled via a communication channel that enables bidirectional data exchange. Each control unit receives data relevant to braking operation and transmits processed information to the other control unit. This feedback mechanism allows coordinated braking control between axles while maintaining the reliability benefits of independent hydraulic circuits, as each control unit can operate autonomously if communication fails.
4Ease of operation
If electronic communication is added between control units, then braking coordination is improved, but system complexity increases
Solution Approach 1:
The communication channel between control units uses electrical/electronic signaling instead of mechanical linkages or hydraulic connections. This substitution provides efficient data exchange for coordinated braking control while maintaining the independence and reliability of the hydraulic brake circuits, adding minimal complexity compared to mechanical alternatives.
Data Source
AI summary
A brake system for a motor vehicle, having a first hydraulic brake device configured to brake wheels on a first axle of the motor vehicle, a first control unit configured to control the braking operation of the wheels on the first axle; and a second hydraulic brake device configured to brake the wheels on a second axle of the motor vehicle, and a second control unit configured to control the braking operation of the wheels on the second axle. The first control unit is coupled with the second control unit via a communication channel. The first control unit and the second control unit are each configured to receive data that are relevant for the control of the braking operation, the first control unit furthermore being configured to transmit a data signal on the basis of the received data via the communication channel to the second control unit.