CACC Speed Profile Optimization for Fuel Efficiency
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Solution Overview
Problem
Cooperative adaptive cruise control (CACC) systems face challenges in maintaining fuel efficiency due to frequent acceleration and deceleration when adjusting to the speed of a target vehicle, leading to reduced fuel efficiency and increased driving costs.
Innovation Solution
A control apparatus and method that utilizes V2X communications and sensors to dynamically adjust the target speed profile of a subject vehicle based on the speed of a target vehicle, optimizing fuel efficiency by managing the driving speed through throttle and brake control, and setting a new target speed profile that considers road information and the current speed of the subject vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CACC system performs deceleration driving to maintain a predetermined distance to the target vehicle, then the safety and collision prevention are improved, but the fuel efficiency deteriorates due to frequent acceleration and deceleration control
Solution Approach 1:
The system pre-calculates a deceleration trajectory that allows the vehicle to reach the target vehicle's speed before decelerating to maintain safety distance. This preliminary speed adjustment reduces the need for frequent braking and subsequent acceleration, thereby improving fuel efficiency while maintaining collision prevention capability
Solution Approach 2:
The control system dynamically adjusts the target speed profile based on the relative position and speed of the target vehicle. By making the target speed adaptive rather than fixed, the system optimizes the balance between maintaining safety distance and minimizing fuel consumption through reduced acceleration-deceleration cycles
2Adaptability or versatility
If the CACC system frequently adjusts acceleration and deceleration to match the target vehicle speed, then the adaptability to target vehicle is improved, but the fuel efficiency and driving cost worsen
Solution Approach 1:
The system performs preliminary speed adjustment by accelerating to match the target vehicle's speed before initiating deceleration to maintain safety distance. This proactive speed management reduces frequent acceleration-deceleration cycles and improves fuel efficiency while maintaining adaptability to the target vehicle
Solution Approach 2:
The control system changes the target speed parameter dynamically based on the target vehicle's speed and the subject vehicle's current state. By optimizing the target speed profile rather than rigidly following the target vehicle's speed, the system reduces unnecessary acceleration and deceleration while maintaining adequate adaptability
Data Source
AI summary
Disclosed herein is a control apparatus and method for improving fuel efficiency in a CACC system, which can improve fuel efficiency through control of a vehicle speed so that a vehicle travels using an optimized cost in consideration of a target vehicle speed, current vehicle speed, minimum driving speed set in the vehicle, and a deceleration distance if the vehicle that uses the CACC system senses a forward vehicle and enters into a CACC active mode. The control method for improving fuel efficiency in a CACC system includes setting a target speed profile based on a target speed of the subject vehicle and an expected driving path, determining whether a target vehicle to be followed by the subject vehicle exists, and controlling the driving speed of the subject vehicle according to the set target speed profile depending on whether or not the target vehicle exists.