Dual Electronic Braking Control Circuits for Fail-Safe Vehicle Systems
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Solution Overview
Problem
Modern vehicle braking systems lack sufficient fail-safety and reliability to perform advanced functions like ABS and ASR, as they are prone to faults that can affect the entire braking system, particularly when one control circuit fails.
Innovation Solution
A dual-braking system with isolated but communicative electronic control circuits, each with its own power supply, that can rapidly take over control from a faulty circuit, ensuring continued operation of critical wheels by coordinating pneumatic brake actuators and exchanging parameters, allowing for seamless transition from electropneumatic to purely electrical control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electronic braking control system is used, then the device complexity is reduced, but the reliability and fail-safety deteriorate because a fault in one control circuit can affect the entire braking system
Solution Approach 1:
The braking control system is divided into two independent control circuits (first and second electronic braking control circuits), each capable of independently controlling braking. This segmentation ensures that a fault in one circuit does not affect the other, thereby improving fail-safety while maintaining manageable complexity through modular design
2Reliability
If brake actuators are assigned to different braking control systems with overlap, then the reliability improves through redundancy, but the device complexity increases due to coordination requirements
Solution Approach 1:
The system segments brake actuator control between two independent electronic braking control circuits, where each circuit can control at least one common brake actuator. This segmentation creates redundancy without requiring complex coordination mechanisms
Solution Approach 2:
The system changes the operational parameter state by allowing brake actuators to be controllable by multiple circuits simultaneously, creating a redundant control architecture where the same actuator can receive control signals from either the first or second electronic braking control circuit depending on operational conditions
3Reliability
If isolated power supplies are used for each control circuit, then the fail-safety improves, but the loss of time increases during fault detection and takeover
Solution Approach 1:
The system performs preliminary actions by continuously monitoring the operational status of both electronic braking control circuits and maintaining readiness states. When a fault is detected in one circuit, the other circuit is already prepared and can immediately take over control without delay, thus maintaining fast response time while improving fail-safety
Data Source
AI summary
A braking system for vehicles, including at least one first brake circuit, and at least one second brake circuit, in which the at least one first brake circuit and the at least one second brake circuit each have an electrical control circuit, which respectively has an electronic control unit and its own power supply device, and brake actuating devices which are activatable by the electronic control units, at least one of the brake actuating devices being activatable by more than one of the electronic control units, in which the brake circuits are electrically activatable via a foot brake valve, and the foot brake valve has two electrical braking transmitter devices which are each connected to the electronic control units so that they are DC-isolated.