Dual-Controller Electronic Parking Braking Failover Control
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Solution Overview
Problem
Existing electronic parking braking systems face issues with failure safety due to single EPB ECUs, leading to potential accidents and increased hardware costs when one ECU fails, without adequate redundancy to ensure safe parking functions.
Innovation Solution
A dualized electronic parking braking system with a main and auxiliary parking braking controller, connected through multiple communication channels, ensuring that if one controller fails, the other can take over to maintain parking braking functionality, thus guaranteeing safety and reducing hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two EPB ECUs are provided to implement safety protection, then the reliability of parking braking is improved, but the hardware cost and system volume increase
Solution Approach 1:
The auxiliary EPB ECU is designed to perform multiple functions: it can serve as a backup controller when the main ECU fails, and it can also handle normal parking braking operations. This multi-functionality allows the system to maintain high reliability without requiring dedicated redundant hardware for all scenarios, thereby reducing overall hardware costs and system volume.
Solution Approach 2:
The auxiliary EPB ECU is pre-configured and kept in standby mode, ready to take over immediately if the main ECU fails. This preliminary preparation ensures that safety protection is already in place without requiring additional hardware activation or complex real-time decision-making, thus maintaining reliability while minimizing system complexity.
2Reliability
If one EPB ECU breaks down, then the reliability of the system deteriorates, but adding more ECUs increases hardware cost
Solution Approach 1:
The system incorporates a preliminary cushioning mechanism by having the auxiliary EPB ECU in standby mode, ready to compensate for main ECU failure. This prior cushioning ensures that when the main ECU breaks down, the auxiliary ECU can immediately take over, maintaining system reliability without requiring additional hardware beyond the single auxiliary unit.
3Reliability
If additional EPB ECUs and relays are added, then the failure safety is improved, but the hardware cost and system volume increase
Solution Approach 1:
The auxiliary EPB ECU is designed with universal functionality to handle both normal operations and failure compensation scenarios. By eliminating the need for separate relays and additional ECUs, the system achieves high failure stability while minimizing hardware costs and system volume.
Data Source
AI summary
In an electronic parking braking system and a control method thereof, the system includes a transmission apparatus, a main parking braking controller and an auxiliary parking braking controller. The transmission apparatus sends a parking request signal when a parking (P) stage is input. The main parking braking controller determines whether being capable of performing a main parking braking control upon receiving the parking request signal, performs the main parking braking control upon determining that the main parking braking controller can perform the main parking braking control, and sends a failure signal to the transmission apparatus upon determining that the main parking braking controller cannot perform the main parking braking control. When the transmission apparatus receives the failure signal, the auxiliary parking braking controller may perform an auxiliary parking braking control. The auxiliary parking braking controller performs an auxiliary parking braking control based on the parking request signal in an activation state.