Cruise Control Using ADAS Slope Data
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Solution Overview
Problem
Cruise control systems face inefficiencies in fuel consumption and driving performance due to frequent acceleration and deceleration on roads with slope variations, as they struggle to maintain a constant speed effectively on uphill and downhill roads.
Innovation Solution
A cruise control system that utilizes advanced driver assistance system (ADAS) map information to analyze road slopes and adjust vehicle speed by setting control target speeds based on slope variations between consecutive sections, implementing acceleration, deceleration, and gear-shifting to maintain optimal speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cruise control system maintains a constant target vehicle speed on roads with slope variations, then the system operates simply without using complex map information, but the actual vehicle speed exceeds the target speed by an allowable variation and frequent acceleration or deceleration control is required, deteriorating fuel efficiency and driving performance
Solution Approach 1:
The system performs preliminary analysis of map information regarding road slopes before the vehicle reaches those sections. By obtaining slope data for upcoming road sections and calculating required acceleration or deceleration in advance, the system can proactively adjust the target vehicle speed to match future road conditions, thereby reducing the need for frequent reactive acceleration and deceleration controls that waste fuel.
Solution Approach 2:
The system dynamically adjusts the target vehicle speed based on varying road slope conditions rather than maintaining a fixed constant speed. The controller modifies the target speed according to the analyzed slope information, allowing the vehicle to operate at optimal speeds for each road section, which reduces unnecessary acceleration and deceleration events and improves overall fuel efficiency.
2Speed
If the cruise control system frequently accelerates or decelerates to maintain the set target vehicle speed on roads with slope variations, then the target speed is maintained, but fuel efficiency and driving performance deteriorate
Solution Approach 1:
The system calculates the required acceleration or deceleration in advance by analyzing map information for upcoming road sections. This preliminary calculation allows the controller to adjust the target vehicle speed before the vehicle encounters the slope variation, reducing the need for frequent reactive speed adjustments and improving fuel efficiency.
Solution Approach 2:
The system changes the target vehicle speed parameter based on road slope conditions. Instead of maintaining a fixed target speed, the controller adjusts the target speed parameter according to the analyzed slope information, allowing the vehicle to operate at optimal speeds for each road section and reducing unnecessary acceleration and deceleration events.
3Loss of energy
If the cruise control system uses map information to adjust target vehicle speed based on road slopes, then fuel efficiency improves, but the device complexity increases due to additional controllers and analysis units
Solution Approach 1:
The system integrates multiple functions into a unified cruise control apparatus that combines map information analysis, slope calculation, and target speed adjustment capabilities. By making the cruise control system multi-functional, it can process various types of road information and adapt to different driving conditions without requiring separate dedicated systems, thus improving fuel efficiency while limiting the increase in overall device complexity.
4Measurement precision
If the cruise control system analyzes map information of three consecutive forward sections, then the accuracy of speed control improves, but the processing complexity and time requirements increase
Solution Approach 1:
The system divides the road ahead into three consecutive forward sections and analyzes map information for each segment separately. This segmentation allows the controller to calculate slope variations and determine appropriate target speeds for each specific section, improving the precision of speed control by considering local road conditions rather than treating the entire route as a single uniform section.
Data Source
AI summary
A cruise control system, the vehicle including the same, and the method of controlling the cruise control system are provided to improve fuel efficiency by changing control target vehicle speeds by continuously predicting vehicle speeds and variations in required driving forces on roads with various slope variations. Additionally, driving performance is improved by using kinetic energies and preventing unnecessary acceleration and deceleration in comparison with conventional vehicles. Driver convenience and satisfaction is also improved by preventing an unintended operation stop of the cruise control system caused by frequent acceleration and deceleration on roads with substantial slope variations in advance and by preventing unintended acceleration/deceleration on roads with frequent slope variations.