Dual-Control Vehicle Braking for Emergency Redundancy
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Solution Overview
Problem
Existing motor vehicle braking systems lack redundancy in emergency braking functions, particularly in autonomous vehicles that may not include manual braking members, leading to safety concerns in case of failures in the hydraulic or electric braking circuits.
Innovation Solution
A braking system with dual electronic control devices controlling both hydraulic and electric actuators, ensuring emergency parking and driving braking capabilities even in the event of control device failures, without the need for a manual braking member, by switching between control devices in case of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual braking member is included to guarantee emergency braking redundancy, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The braking system is divided into two independent control devices: a first electronic control device for normal operation and a second electronic control device specifically for emergency braking functions. This segmentation allows the emergency braking function to be isolated and controlled separately, providing redundancy without requiring a complete manual braking system
Solution Approach 2:
The second electronic control device is designed to perform multiple emergency functions including emergency dynamic braking, emergency parking braking, and hill hold control. This multi-functionality consolidates what would traditionally require separate manual braking mechanisms into a single integrated electronic control unit
2Ease of operation
If autonomous vehicle operation is implemented without manual braking members, then ease of operation is improved, but safety in case of control failure deteriorates
Solution Approach 1:
The second electronic control device is pre-configured and continuously monitored during normal operation. In the event of control device failure, it can immediately take over without requiring manual intervention, thus maintaining autonomous operation while ensuring safety through pre-established backup control capabilities
Solution Approach 2:
The system implements continuous monitoring and feedback mechanisms where the first and second electronic control devices can detect each other's status. When a failure is detected in the primary control device, the system automatically switches to the backup control device, providing fail-safe operation for autonomous vehicles
Data Source
AI summary
A braking system for a motor vehicle including a main braking circuit, an auxiliary electric braking circuit configured to perform parking braking, a first electronic control device which controls i) the main braking circuit to actuate a first braking member and a second braking member, and ii) in the auxiliary electric braking circuit, a first electric actuator of the first braking member, and a second electronic control device which controls, in the auxiliary electric braking circuit, a second electric actuator of the second braking member. A motor vehicle including such a braking system and to methods for controlling such a braking system.