Adaptive Brake Assistance Threshold Adjustment
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Solution Overview
Problem
Conventional brake assistance systems fail to effectively recognize and respond to emergency braking situations, particularly when braking pressure and pressure gradient do not exceed predefined threshold values, leading to increased stopping distances and accident risks.
Innovation Solution
The method adjusts braking pressure and pressure gradient threshold values based on various factors such as environmental hazards, external temperature, vehicle roll stability, and yaw rate, using sensors like cameras, infrared, or radar systems, to initiate emergency braking cycles even when traditional thresholds are not met, thereby enhancing the system's ability to detect and react to emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fixed threshold values for braking pressure and pressure gradient are used, then the brake assistance system operates reliably under normal conditions, but it fails to detect emergency braking situations when thresholds are not exceeded
Solution Approach 1:
The patent implements dynamic threshold adjustment where the braking pressure threshold and pressure gradient threshold are no longer fixed values but are continuously adapted based on detected driving situations. The controller modifies these thresholds according to factors such as vehicle speed, road conditions, and environmental hazards, allowing the system to maintain high detection reliability across varying operating conditions while improving adaptability to different driving scenarios.
Solution Approach 2:
The system changes the parameters (threshold values) based on the detected driving situation. When an emergency situation is detected through environmental sensors or driving pattern analysis, the controller adjusts the threshold parameters to be more sensitive, enabling detection of braking situations that would otherwise fall below conventional fixed thresholds. This parameter adaptation resolves the contradiction by maintaining reliability through systematic adjustment rather than arbitrary changes.
2Reliability
If the brake assistance system activates only when both braking pressure and pressure gradient exceed predefined thresholds, then false activations are minimized, but emergency braking situations are missed when thresholds are not met
Solution Approach 1:
The patent adds another dimension to the detection criteria by incorporating environmental hazard detection and driving situation analysis alongside the traditional braking pressure and pressure gradient measurements. Instead of relying solely on the two-dimensional threshold comparison, the system evaluates multiple dimensions including sensor data from cameras, radar, or other environmental sensors. This multi-dimensional approach allows the system to activate in emergency situations even when traditional thresholds are not exceeded, improving detection precision without causing false activations.
3Measurement precision
If threshold values are lowered to detect more emergency situations, then detection sensitivity improves, but false activations increase
Solution Approach 1:
The system employs feedback mechanisms where the controller continuously monitors multiple parameters including braking pressure, pressure gradient, environmental sensor data, and vehicle dynamics. This feedback loop allows the system to distinguish between genuine emergency situations requiring activation and normal braking events. The feedback from environmental sensors and driving pattern analysis provides context that prevents false activations while maintaining high detection sensitivity through adaptive threshold adjustment.
Data Source
AI summary
A method of operating a brake assistance system in a vehicle is disclosed. The method includes determining a braking operation as an emergency braking situation, which in turn includes sensing a braking pressure applied to a brake pedal, determining a braking pressure gradient of the braking pressure, and evaluating at least one factor of the driving situation, checking whether that factor indicates an emergency braking situation. If that factor indicates an emergency braking situation, adjustments to a braking pressure threshold value and a braking pressure gradient threshold value are carried out, reducing those threshold values by a predetermined amount. Thereafter, if both the braking pressure and the braking pressure gradient exceed the adjusted braking pressure threshold value and the adjusted braking pressure gradient threshold value, respectively, the braking operation is identified to be an emergency braking situation, accompanying activation of an emergency braking cycle.