Vehicle Brake System Maintenance Mode Control
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Solution Overview
Problem
Brake control systems can inadvertently build up brake pressure during maintenance or in unfilled states, posing risks of injury and contamination due to uncontrolled fluid leakage or unexpected actuation, and there is a need to safely manage brake pressure in both normal and maintenance modes.
Innovation Solution
A method and control unit that allow the brake system to operate in both normal and maintenance modes, where the maintenance mode inhibits brake pressure build-up, utilizing a non-volatile indicator to manage the mode switching based on user input or diagnostic unit connections, ensuring safe operation by preventing actuation of brake pressure generators during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pressure generator is allowed to operate automatically for braking functions and self-diagnosis, then braking performance and system functionality are improved, but risk of injury and contamination during maintenance increases
Solution Approach 1:
The brake control system dynamically switches between normal mode and maintenance mode based on the operational state. In normal mode, the brake pressure generator operates automatically for braking functions and self-diagnosis. In maintenance mode, automatic pressure build-up is inhibited. This dynamic adaptation resolves the contradiction by allowing full functionality during operation while preventing harmful effects during maintenance.
Solution Approach 2:
The system changes the operational parameter of the brake pressure generator based on the detected mode. In normal mode, the generator is enabled to build up brake pressure for braking functions. In maintenance mode, the generator is disabled to prevent unexpected pressure build-up. This parameter change resolves the contradiction by adjusting the system behavior according to the operational context.
2Speed
If brake system operates in normal mode with automatic pressure build-up, then braking responsiveness is improved, but system safety during unfilled state deteriorates
Solution Approach 1:
The system performs preliminary action by detecting the operational state (normal or maintenance mode) before allowing brake pressure build-up. In normal mode, the system is prepared to build up pressure quickly for responsive braking. In maintenance mode, the system is prepared to inhibit pressure build-up to ensure safety. This preliminary detection and preparation resolves the contradiction by ensuring the system is in the correct state before pressure build-up occurs.
3Object-affected harmful factors
If maintenance mode is always active to prevent pressure build-up, then safety during maintenance is improved, but braking functionality deteriorates
Solution Approach 1:
The system dynamically adjusts its operational mode based on the detected state. When in maintenance mode, the brake pressure generator is inhibited to prevent harmful effects. When in normal mode, the generator operates normally to provide full braking functionality. This dynamic switching resolves the contradiction by allowing the system to optimize for safety during maintenance and for functionality during normal operation.
Data Source
AI summary
A method for operating a brake system of a vehicle in a maintenance mode and in a normal mode includes providing a brake pressure in the brake system in the normal mode using a brake pressure generator. The method further includes preventing a provision of a brake pressure by the brake pressure generator in the maintenance mode.