Vehicle Brake System Fault Classification and Selective Actuator Switchover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current brake systems for vehicles often unnecessarily switch to a pneumatic backup mode upon faults in the electronic actuator, potentially reducing the safety level by not utilizing the higher safety capabilities of the electronic regulator, and may not always improve the system characteristic depending on the fault type.
Innovation Solution
A method that classifies fault signals into categories to determine whether switching from the electronic actuator to the pneumatic actuator improves brake pressure output, allowing for selective switchover based on fault type, and includes temporary testing to assess system characteristic improvements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic actuator is permanently switched to electrically deenergized state upon fault identification, then the pneumatic backup path ensures minimum safety, but the higher safety level of the electronic regulator remains unutilized and system characteristic is not optimized
Solution Approach 1:
The system dynamically adjusts the actuator operating state based on fault classification. Instead of a static deenergized state, the control device evaluates the fault type and selectively transitions between electrically energized and deenergized states, allowing the system to adapt its characteristics to maintain optimal safety and performance based on the specific fault condition
Solution Approach 2:
The control device changes the electrical parameter state (energized vs. deenergized) of the actuator based on the classified fault category. This parameter change allows the system to optimize its characteristic - maintaining electrical operation for certain faults while switching to pneumatic backup only when necessary, thereby preserving the higher safety level of the electronic regulator when applicable
2Reliability
If the actuator is switched to pneumatic backup path upon any fault, then minimum safety is ensured, but the system characteristic improvement is not always achieved depending on fault type
Solution Approach 1:
The fault space is segmented into different categories (first fault category and second fault category) based on whether pneumatic backup provides improvement. This segmentation allows the system to apply different responses - switching to pneumatic backup for faults where it improves characteristics, and maintaining electronic operation for faults where it does not, thereby optimizing overall system productivity and performance
3Reliability
If the electronic actuator is permanently deenergized upon fault, then the fault's impact is contained, but the higher safety capabilities of the electronic regulator are not utilized
Solution Approach 1:
The control device acts as an intermediary that mediates between the fault detection and the actuator state transition. It introduces a classification step that evaluates the fault type and determines the appropriate response, preventing premature or unnecessary deenergizing while ensuring safety capabilities are maintained through selective fault category-based decision making
Data Source
AI summary
A method for operating a vehicle brake system, including: classifying a fault signal, indicating a fault of an electronic actuating device of the brake system, the actuating device outputting a brake pressure for a brake of the vehicle in a normal operating mode and a pneumatic actuating device for outputting the brake pressure in a backup operating mode, as a fault signal of a first fault category if the fault is a fault in which a switchover from the electronic actuating device afflicted with the fault to the pneumatic actuating device leads to an improvement in the outputting of the brake pressure; and switching from the electronic actuating device to the pneumatic actuating device, to output the brake pressure using the pneumatic actuating device, if the fault signal is a fault signal of the first fault category. A related computer readable medium, apparatus and brake system are also described.