Platooning Control Feedforward Zeroing for Gear Shift Stability
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Solution Overview
Problem
During platooning, gear shifting in lead vehicles can cause unpredictable changes in intervehicle distance, leading to increased fuel efficiency consumption due to mismatches between required and actual accelerations.
Innovation Solution
A platooning control apparatus that detects acceleration and shifting in lead vehicles through V2V communication, sets a feedforward control input value of the host vehicle to zero during gear shifting, and gradually increases it to match the required acceleration of the lead vehicle, using a processor to manage intervehicle distance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the feedforward control input value is set to match the required acceleration of the lead vehicle during gear shifting, then the intervehicle distance control responds quickly to acceleration demands, but the intervehicle distance becomes unstable due to mismatches between required and actual accelerations during gear shifting
Solution Approach 1:
The controller detects gear shifting status in advance through V2V communication and applies a counteracting control by setting the feedforward control input value to zero during the gear shifting period. This preliminary anti-action prevents the instability caused by acceleration mismatches before it occurs, while maintaining quick response capability through rapid detection and control adjustment.
2Stability of the object's composition
If the feedforward control input value is set to zero during gear shifting to maintain stable intervehicle distance, then the intervehicle distance remains stable, but the response to acceleration demands becomes delayed
Solution Approach 1:
The controller dynamically adjusts the feedforward control input value based on the real-time gear shifting status of the lead vehicle. During normal operation, the feedforward control responds quickly to acceleration demands. During gear shifting, it temporarily sets the value to zero to maintain stability. This dynamic adaptation allows the system to optimize between speed and stability according to operating conditions.
3Use of energy by moving object
If the distance between platooning vehicles is kept as short as possible to maximize fuel efficiency, then fuel efficiency is improved, but the system becomes more sensitive to acceleration mismatches during gear shifting
Solution Approach 1:
The system uses V2V communication to receive real-time information about the lead vehicle's gear shifting status and incorporates this feedback into the control decision-making process. By detecting gear shifting events through feedback from the lead vehicle and adjusting the feedforward control input accordingly, the system maintains reliable distance control even at short platooning distances, thereby preserving fuel efficiency without sacrificing reliability.
Data Source
AI summary
A platooning control apparatus may include a processor configured to detect the occurrence of acceleration and shifting of a vehicle in front of a host vehicle based on information received from the vehicle in front during platooning, and to set a feedforward control input value of a host vehicle to zero for controlling an inter-vehicle distance with the vehicle in front in a section in which the acceleration and the shifting of the vehicle in front occurs; and a storage configured to store data and algorithms driven by the processor.