Auto-Braking Override Threshold Coordination with Speed Limiter
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Solution Overview
Problem
Existing vehicle systems lack coordination between autonomous braking and speed limiter systems when both are activated, leading to potential loss of safety benefits due to uncoordinated override settings.
Innovation Solution
The vehicle's auto-braking system adaptively adjusts its override threshold to match or exceed the speed limiter system's override threshold when the speed limiter is active, ensuring safety benefits are maintained by synchronizing override controls through the engine's power output parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auto-braking system uses a lower override threshold to maintain safety, then collision prevention is improved, but driver convenience deteriorates because the driver cannot easily override the system when needed
Solution Approach 1:
The override threshold is made dynamic rather than fixed. The system automatically adjusts the threshold based on the operational state of the speed limiter system. When the speed limiter is active, the override threshold increases to match it, allowing easier driver override. When the speed limiter is inactive, the threshold remains lower to maintain safety. This dynamic adaptation resolves the contradiction between safety and driver convenience.
2Adaptability or versatility
If separate override thresholds are used for auto-braking and speed limiter systems, then each system can be optimized independently, but system coordination deteriorates leading to conflicting behaviors
Solution Approach 1:
The system merges the override threshold settings of the auto-braking system and speed limiter system by making them equal when the speed limiter is active. Instead of maintaining completely independent thresholds, the auto-braking threshold is adjusted to match the speed limiter threshold under specific conditions. This partial merging ensures coordinated behavior while preserving the independence to use different thresholds when the speed limiter is inactive.
Data Source
AI summary
A method of operating an auto-braking system of a vehicle in coordination with operation of a speed limiting system (SLS) of the vehicle to prevent undesired loss of auto-braking functionality. If: a) a driver input of an engine power control parameter (such as throttle setting) exceeds an activation threshold of the SLS so that the SLS is therefore limiting vehicle speed to a set-speed corresponding to the activation threshold; and b) the driver input of the power control parameter is below a SLS override threshold; and c) the SLS override threshold exceeds an auto-braking override threshold for the power control parameter; then the auto-braking override threshold is increased to at least equal the SLS override threshold. The speed limiter activation threshold may be determined from speed limit information supplied by a vehicle navigation system of by an image evaluating unit from images obtained by a camera of the vehicle.