Braking System Control State Transitions for Emergency Stop
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Solution Overview
Problem
Vehicle braking systems face challenges in seamlessly transitioning between manual and automated control modes, particularly during emergencies or system failures, where ensuring safe and efficient deceleration is critical.
Innovation Solution
A braking system with multiple control states that includes a primary and secondary brake control module, allowing transitions between normal and degraded operation modes, and enabling emergency stop states, with a vehicle control module managing these transitions based on predefined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the braking system transitions between manual and automated control modes during operation, then the adaptability and versatility of the vehicle control system is improved, but the device complexity and difficulty of detecting and measuring system state increases
Solution Approach 1:
The braking control system is segmented into distinct functional modules: a vehicle control module that generates brake requests, a braking system controller that manages state transitions, and braking components that execute deceleration. This segmentation allows each module to have specialized responsibilities, making the complex transition logic manageable and maintainable while preserving adaptability across multiple control modes.
Solution Approach 2:
The braking system implements dynamic state transitions between manual and automated control modes based on real-time operating conditions. The system can switch between different control states (manual control state, automated control state, emergency stop state) depending on vehicle speed, brake request status, and system availability, allowing the control structure to adapt dynamically rather than being fixed.
2Reliability
If the braking system enters emergency stop state with multiple state entry conditions, then the reliability and safety of emergency braking is improved, but the device complexity and measurement precision requirements increase
Solution Approach 1:
The system performs preliminary validation of state entry conditions before transitioning to emergency stop state. The braking system controller checks multiple conditions (vehicle speed threshold, brake request status, current control state) before executing the emergency stop, ensuring that the transition is appropriate and safe. This preliminary action prevents premature or incorrect emergency braking activation.
Solution Approach 2:
The braking system implements continuous feedback monitoring of vehicle state parameters (speed, brake requests, control mode) to determine whether emergency stop conditions are met. The system constantly evaluates the relationship between current vehicle state and emergency stop criteria, allowing reliable detection of when emergency braking should be initiated based on real-time feedback rather than static thresholds.
3Ease of operation
If the braking system allows transition from manual to non-manual control state during normal operation mode, then the ease of operation and automation level is improved, but the loss of time for driver reaction and control increases
Solution Approach 1:
The braking system implements dynamic control state transitions that can occur rapidly in response to changing vehicle conditions or driver input. The system allows smooth transitions between manual and automated control states during normal operation, with the braking system controller managing the switch without requiring the driver to physically disengage or reconfigure the system, thereby minimizing control response time while maintaining ease of operation.
4Reliability
If the braking system prevents transition from manual to non-manual control state during degraded operation mode, then the reliability and safety of braking control is improved, but the adaptability and versatility of the control system decreases
Solution Approach 1:
The braking system implements preliminary anti-action by preventing transitions to automated control modes when the system is in a degraded state. The braking system controller detects degraded operation conditions (such as brake fluid level issues, sensor failures, or actuator problems) and blocks automated control state transitions to prevent unsafe operation. This protective measure ensures reliability by avoiding automated braking when system integrity is compromised, while still allowing manual control to maintain basic vehicle operation.
Data Source
AI summary
A method for controlling a vehicle includes operating a braking system in robotic control state, determining that an emergency stop state is to be entered by the braking system, entering the emergency stop state upon determining that all conditions from a group of state entry conditions are satisfied, decelerating the vehicle using the braking system while in the emergency stop state, determining, while in the emergency stop state, that all conditions from a group of state exit conditions are satisfied, and exiting the emergency stop state in response to determining that all conditions from the group of state exit conditions are satisfied.