Adaptive Cruise Control Velocity Profile for Fuel Efficiency
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Solution Overview
Problem
Adaptive cruise control systems face challenges in maintaining fuel efficiency when a preceding vehicle is present, as they often require inflexible acceleration or deceleration controls, leading to deteriorated fuel efficiency and an inability to respond to user requests for fuel-efficient driving.
Innovation Solution
A control method that sets a new target velocity profile based on the current vehicle velocity, preceding vehicle velocity, lowest driving velocity, and deceleration distance, allowing for fuel-efficient driving by comparing driving costs and adjusting vehicle speed through auxiliary deceleration or braking to maintain optimal fuel efficiency without collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACC system performs deceleration driving to maintain a predetermined distance from the preceding vehicle, then collision prevention is ensured, but fuel efficiency deteriorates due to frequent acceleration and deceleration control
Solution Approach 1:
The system dynamically switches between two control modes: velocity profile-based control for fuel efficiency and deceleration control for safety. The controller adjusts the control strategy in real-time based on the inter-vehicle distance, transitioning from economic velocity profile following when distance is sufficient to active deceleration when distance becomes critical, thereby optimizing both fuel efficiency and collision prevention
Solution Approach 2:
The system changes the control parameter from strictly following the economic velocity profile to applying deceleration based on the inter-vehicle distance. When the distance is greater than the predetermined distance, the system uses the velocity profile; when the distance is less than or equal to the predetermined distance, the system switches to deceleration control to maintain safety while minimizing fuel consumption
2Use of energy by moving object
If the ACC system controls vehicle output or braking force based on velocity variation through velocity profile, then fuel efficiency is improved, but the system cannot respond to user requests for fuel efficiency driving when distance conditions change
Solution Approach 1:
The control system is designed to be dynamic and adaptive, continuously monitoring the inter-vehicle distance and switching between two control strategies. The system can transition from velocity profile-based control to deceleration control based on real-time distance conditions, providing versatility in responding to changing driving conditions while maintaining fuel efficiency
Data Source
AI summary
A control method for improving fuel efficiency in an adaptive cruise control system includes: setting a target velocity profile based on a current velocity and position when a vehicle is driven by the adaptive cruise control system; determining, by the controller, whether the preceding vehicle exists while driving by the target velocity profile; comparing, by the controller, a minimum distance for preventing a collision between the preceding vehicle and the following vehicle in a case of applying the target velocity profile with a first distance between the preceding vehicle and the following vehicle when the preceding vehicle exists; and performing, by the controller, fuel efficiency driving of the following vehicle when the minimum distance is larger than the first distance and performing driving of the following vehicle according to the target velocity profile when the minimum distance is smaller than the first distance.