Autonomous Vehicle Cut-In Response Using Adaptive Time-Gap Braking

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Solution Overview

Problem

Autonomous vehicles face challenges in safely responding to vehicles that cut in front of them, as determining the appropriate deceleration or braking behavior can be complex due to varying traffic conditions and human expectations of comfort and safety.

Innovation Solution

A system and method for an autonomous vehicle to determine a following behavior by calculating distance, time gap, and time to collision with a cut-in vehicle, using discrete braking levels to ensure safe and comfortable responses, including emergency, aggressive, moderate, recovery, and any braking based on predefined thresholds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the autonomous vehicle decelerates to maintain a safe time gap from a cut-in vehicle, then safety is improved, but travel time and productivity deteriorate

Engineering Contradiction:

ImprovesafetyVSAvoidtravel time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system dynamically adjusts the time gap parameter based on multiple factors including relative speed, distance to cut-in vehicle, and road conditions. By changing the safety parameter (time gap) adaptively rather than using a fixed value, the system maintains safety while minimizing unnecessary deceleration and travel time loss

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The autonomous vehicle's response is dynamic rather than static - it continuously monitors parameters like relative speed, distance, and road conditions to determine the appropriate deceleration level. This dynamic adjustment allows the vehicle to maintain safety margins while optimizing travel time based on real-time conditions

Inventive Principle:

Principle #15Dynamics

2Reliability

If the autonomous vehicle decelerates aggressively to respond to a cut-in vehicle, then safety is improved, but passenger comfort deteriorates

Engineering Contradiction:

ImprovesafetyVSAvoidpassenger comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system applies partial deceleration rather than always applying maximum braking. By using discrete braking levels (gentle, moderate, aggressive) and selecting the minimum necessary deceleration to maintain safety, the system ensures safety while minimizing passenger discomfort from excessive braking

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The deceleration response is segmented into discrete levels (gentle, moderate, aggressive braking) rather than being continuous. This segmentation allows the system to select the appropriate level of comfort versus safety based on the situation, applying only the necessary deceleration intensity

Inventive Principle:

Principle #1Segmentation

3Reliability

If the autonomous vehicle maintains a large time gap from the cut-in vehicle, then safety is improved, but traffic flow efficiency deteriorates

Engineering Contradiction:

ImprovesafetyVSAvoidtraffic flow efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system changes the time gap parameter dynamically based on relative speed, distance to cut-in vehicle, and road conditions. Rather than maintaining a consistently large time gap, the system adjusts the gap size to be just sufficient for safety, thereby improving traffic flow efficiency while maintaining safety margins

Inventive Principle:

Principle #35Parameter changes

4Reliability

If the autonomous vehicle responds immediately to a cut-in vehicle, then safety is improved, but energy consumption increases

Engineering Contradiction:

ImprovesafetyVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system applies partial deceleration rather than immediate maximum braking in all situations. By using discrete braking levels and selecting the minimum necessary deceleration to maintain safety, the system responds safely while minimizing energy consumption from aggressive braking maneuvers

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12448003B2Algorithm for the AV to safely respond to a cut-in vehicle

Publication Date: 2025.10.21 GM CRUISE HOLDINGS LLC

AI summary

Systems and methods are provided for determining a required following behavior when a road actor or vehicle cuts in front of an autonomous vehicle. The appropriate following behavior depends on various factors including road and weather conditions, recovery time gap, minimum time gap for the autonomous vehicle speed, distance between the autonomous vehicle and cut-in vehicle, speed of the autonomous vehicle at the time of cut-in, speed of the cut-in vehicle, time to collision threshold for hard braking, and time to collision threshold for normal braking. Types of following behaviors include emergency deceleration, aggressive deceleration, moderate deceleration, recovery deceleration, some deceleration or following without deceleration. In some examples, the recovery time gap can be set to 3 or more seconds. In some examples, it is set to below 3 seconds. As the recovery time gap increases, the following distance between the autonomous vehicle and a leading vehicle increases.