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 CACC system that utilizes V2X communications and sensors to dynamically adjust the target speed profile based on the current speed of the subject vehicle, the target vehicle's speed, and road information, allowing for optimized throttle and brake control to maintain a safe distance while minimizing unnecessary deceleration.
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 collision prevention is improved, but fuel efficiency deteriorates due to frequent acceleration and deceleration control
Solution Approach 1:
The system dynamically adjusts the target speed profile based on real-time conditions including target vehicle speed, current speed, minimum driving speed, and deceleration distance. This dynamic adaptation allows the system to optimize fuel efficiency while maintaining safety by avoiding unnecessary deceleration and frequent acceleration-deceleration cycles
Solution Approach 2:
The control apparatus changes key operating parameters (target speed, acceleration rate, deceleration distance) based on the detected state of the target vehicle and road conditions. By adjusting these parameters dynamically, the system resolves the contradiction between maintaining safe following distance and minimizing fuel consumption from frequent speed changes
2Reliability
If the CACC system adjusts speed based on target vehicle speed to maintain inter-vehicle distance, then safety is improved, but driving cost increases due to stiff control with frequent acceleration and deceleration
Solution Approach 1:
The system performs preliminary deceleration in advance when the target vehicle is detected, rather than reacting with frequent stiff control. By proactively adjusting speed based on predicted deceleration distance and minimum driving speed, the system reduces the need for subsequent frequent acceleration and deceleration cycles, thereby lowering driving costs while maintaining safety
Solution Approach 2:
The control apparatus continuously monitors the inter-vehicle distance, target vehicle speed, and subject vehicle speed, and uses this feedback to dynamically adjust the target speed profile. This closed-loop feedback mechanism enables smooth speed adjustments that maintain safety margins while avoiding the energy-wasting stiff control patterns of frequent acceleration and deceleration
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.