Adaptive Cruise Control Acceleration Limiting for Ride Comfort
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Solution Overview
Problem
In congested traffic conditions, adaptive cruise control systems often cause rapid acceleration or deceleration of vehicles, leading to ride discomfort for drivers.
Innovation Solution
An adaptive cruise control apparatus and method that utilize sensors to acquire information on surrounding vehicles, determining traffic conditions and limiting vehicle acceleration to prevent rapid changes, thereby maintaining ride comfort by controlling the power train based on calculated traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive cruise control is used to maintain safe following distance, then driving safety is improved, but rapid acceleration or deceleration occurs in congested traffic causing ride discomfort
Solution Approach 1:
The system dynamically adjusts acceleration limits based on detected traffic conditions. In congested traffic, the acceleration limit is reduced to prevent rapid acceleration, while in non-congested traffic, normal acceleration limits are maintained. This dynamic adaptation resolves the contradiction by making the cruise control system flexible enough to provide both safety and comfort according to situational context.
Solution Approach 2:
The system changes the acceleration parameter based on traffic condition detection. When congestion is detected through sensor data analysis (vehicle density, speed variations), the acceleration parameter is modified to be more restrictive. This parameter change allows the system to maintain safety margins while preventing uncomfortable rapid movements in congested conditions.
2Ease of operation
If acceleration is limited to prevent rapid changes, then ride comfort is improved, but response time to traffic changes may increase
Solution Approach 1:
The acceleration limit is not fixed but dynamically adjusted based on real-time traffic conditions. In congested traffic where comfort is prioritized, limits are stricter. However, when traffic conditions improve or change rapidly, the system can quickly adjust the acceleration limits to allow faster response, thus resolving the time-comfort contradiction through dynamic adaptability.
Solution Approach 2:
The system continuously monitors traffic conditions through sensors and provides feedback to the control algorithm. This feedback loop allows the system to detect changes in traffic flow and adjust acceleration behavior accordingly, ensuring that comfort limitations do not permanently delay necessary responses to changing traffic conditions.
Data Source
AI summary
An adaptive cruise control apparatus includes a sensor device for acquiring information on vehicles around a subject vehicle including information on a distance between a forward vehicle and the subject vehicle, and a controller for calculating an acceleration of the subject vehicle based on the information on vehicles around the subject vehicle, determining a traffic condition around the subject vehicle based on the information on vehicles around the subject vehicle, limiting the acceleration of the subject vehicle according to the determined traffic condition, and controlling a power train of the subject vehicle according to the limited acceleration.