Adaptive Cruise Control Driving Time Consistency
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Solution Overview
Problem
Adaptive cruise control systems that aim to minimize fuel consumption often result in varying driving times compared to traditional cruise controls, leading to potential driver dissatisfaction and reduced perceived fuel savings due to increased average speeds.
Innovation Solution
An adaptive cruise control system that calculates and adjusts the desired speed to match the driving time of a conventional non-adaptive cruise control, eliminating time differences by identifying sections where engine output is sufficient and simulating a traditional cruise control to maintain consistent driving times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If adaptive cruise control varies vehicle speed to minimize fuel consumption, then fuel efficiency is improved, but driving time becomes inconsistent compared to traditional cruise control
Solution Approach 1:
The system continuously monitors actual driving time and compares it with the reference driving time from traditional cruise control. Based on this feedback, the computing unit dynamically adjusts the desired speed values sent to the cruise control regulator, ensuring driving time consistency while maintaining fuel efficiency benefits.
Solution Approach 2:
The system changes the speed parameter dynamically by calculating adjusted desired speed values that compensate for time differences. The computing unit modifies speed commands to the cruise control regulator based on real-time comparisons between adaptive and traditional cruise control performance, maintaining both fuel efficiency and time consistency.
2Loss of time
If adaptive cruise control increases average speed to reduce driving time, then time efficiency is improved, but fuel consumption savings are cancelled out
Solution Approach 1:
The system uses feedback from both time and fuel consumption measurements to adjust speed commands. When the system detects that average speed increases are cancelling out fuel savings, the computing unit modifies desired speed values to maintain the fuel efficiency advantage while accepting minimal time variation.
Solution Approach 2:
The system applies partial speed adjustments rather than maximizing speed increases. By making moderate, calculated speed modifications instead of aggressive speed increases, the system maintains fuel consumption savings while achieving acceptable time efficiency improvements.
3Use of energy by moving object
If adaptive cruise control adjusts speed based on road topology, then fuel consumption is reduced, but driver acceptance decreases due to perceived time loss
Solution Approach 1:
The system provides feedback to the driver through the display unit, showing the reference driving time and actual driving time. This transparency helps drivers understand the system's behavior and maintains acceptance by demonstrating that the system is working as intended to provide fuel savings.
Solution Approach 2:
The computing unit acts as an intermediary between the fuel efficiency goals and driver expectations. It calculates adjusted speed commands that balance fuel consumption reduction with maintaining acceptable driving times, mediating between conflicting requirements to preserve driver acceptance.
Data Source
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AI summary
The invention refers to a system and a method for maintaining driving times with an adaptive cruise control comprising a cruise control regulator in a motor vehicle whose control system is regulated by the cruise control regulator. The system for maintaining driving times comprises: an input unit for indicating desired speed values v set for the adaptive cruise control; a computing unit adapted to identify a section Sj of a driven run S during which the driving time is to be determined; to calculate the time t cc it would have taken to drive the section Sj when using a conventional non-adaptive cruise control; to determine the time t adapt actually taken to drive the section S i with the adaptive cruise control; to calculate the time difference between t cc and tadapt ,' and to calculate an adjusted control signal v setkorr to be used as control signal to the cruise control regulator so that said time difference disappears as the vehicle continues its journey; v setkorr being used as control signal to the adaptive system's cruise control regulator.