Brake-By-Wire Axle Controller Redundancy for Brake Boosting
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Solution Overview
Problem
In brake-by-wire systems, the failure of a central control unit leads to reduced vehicle controllability and safety risks, as brake boosting cannot be maintained.
Innovation Solution
A brake system design with two axle controllers, each comprising two control units, ensures redundancy and fault tolerance by allowing one control unit to take over if another fails, maintaining brake boosting and vehicle controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central control unit is used to control all wheel brakes, then the device complexity is reduced and cost is lowered, but the reliability decreases because a single point of failure disables the entire brake system
Solution Approach 1:
The brake control system is segmented into multiple independent control units, each responsible for specific wheel brakes. This segmentation eliminates the single point of failure in a central control unit, as a failure in one control unit does not affect the operation of other control units, thereby improving reliability while maintaining manageable system complexity through modular architecture
2Reliability
If redundant control units are implemented to maintain brake boosting after failure, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
Multiple control units are merged into a single distributed control architecture where each control unit can independently manage its assigned wheel brakes. This merging approach provides redundancy and fault tolerance without requiring a fully centralized system, balancing reliability improvement with controlled complexity through shared communication infrastructure and coordinated control logic
Data Source
AI summary
A brake system includes a dry brake pedal with a pedal sensor for detecting the driver input. The brake system also includes four electrically controllable wheel brake modules, each including an electrically controllable wheel brake.A first axle controller is assigned two wheel brake modules and a second axle controller is assigned two further wheel brake modules. Each of the axle controllers is connected to the brake pedal on a signal input side Each of the axle controllers includes two control units, which each control one wheel brake.