Vehicle Collision Avoidance Re-Acceleration Control After Braking
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Solution Overview
Problem
Existing collision avoidance systems in vehicles experience undesirable sudden re-accelerations after deceleration interventions, leading to repeated interventions and driver discomfort due to unpredictable vehicle behavior, especially in mobile work machines with obscured paths of travel.
Innovation Solution
A method that decelerates a vehicle upon detecting a collision-relevant object, conditionally enables re-acceleration only if the object is determined to be less critical, and limits re-acceleration at the beginning of the release period to prevent sudden increases, using a controlled re-acceleration strategy based on time to collision (TTC) and vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full re-acceleration is enabled immediately after deceleration intervention, then vehicle availability and response time are improved, but driver comfort deteriorates due to sudden re-acceleration causing repeated interventions
Solution Approach 1:
The system performs preliminary assessment of the collision-relevant object during the deceleration period to determine if it is less critical before enabling re-acceleration. This preliminary action prevents sudden re-acceleration by ensuring the object will not cause immediate collision, thus improving driver comfort while maintaining vehicle availability.
Solution Approach 2:
The system dynamically adjusts the re-acceleration behavior based on the criticality assessment of the collision-relevant object. For less critical objects, full re-acceleration is enabled; for critical objects, re-acceleration is limited. This dynamic adaptation resolves the contradiction by making the system responsive to real-time conditions.
2Ease of operation
If re-acceleration is limited at the beginning of the release period, then driver comfort is improved by preventing sudden re-acceleration, but vehicle productivity deteriorates due to reduced acceleration availability
Solution Approach 1:
The system applies different re-acceleration strategies to different situations: full re-acceleration is enabled when the collision-relevant object is determined to be less critical, while limited re-acceleration is applied when the object remains critical. This local differentiation resolves the contradiction by tailoring the acceleration behavior to the specific risk level.
Solution Approach 2:
The system changes the acceleration parameter dynamically based on the criticality assessment. The acceleration capability is adjusted from limited to full based on the determined criticality of the collision-relevant object, thereby optimizing both driver comfort and vehicle productivity for each specific situation.
3Reliability
If the collision-relevant object is continuously monitored during the release period, then collision safety is improved by detecting critical objects, but system complexity increases due to continuous monitoring requirements
Solution Approach 1:
The system performs a partial assessment of the collision-relevant object during the deceleration period to determine if it is less critical, rather than continuous monitoring throughout the release period. This partial action is sufficient to prevent repeated interventions while reducing system complexity compared to continuous monitoring.
Data Source
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AI summary
A collision avoidance method (400) is proposed which comprises braking (420) a vehicle (1) during a braking period when a collision-relevant object (2) is detected in a collision monitoring area (3), and which comprises conditionally enabling (430) a restart of the vehicle (1) during a release period after the braking period, wherein the enabling (430) of the re-acceleration of the vehicle (1) is carried out under the condition that the collision-relevant object (2) is determined to be a less critical collision-relevant object (2), and wherein a limitation of the re-acceleration is carried out at the beginning of the release period if the collision-relevant object (2) is still detected in the collision monitoring area (3).