Adaptive Cruise Control Speed Limit Dynamics
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Solution Overview
Problem
Existing cruise control systems limit fuel efficiency and driveability by restricting the variation of actual vehicle speed within predetermined limits, which can lead to suboptimal fuel consumption and driveability, especially when trying to maintain maximum speed limits set by authorities.
Innovation Solution
The system allows for automatic control of vehicle speed to vary within a larger interval than previously possible, limited by the maximum speed limit set by authorities, enabling extended use of higher gears and coasting, while preventing excessive speed breaches, by distinguishing between manual and automatic control speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actual vehicle speed is restricted to vary within a narrow predetermined interval to ensure compliance with speed limits, then speed limit compliance is improved, but fuel consumption increases and driveability deteriorates
Solution Approach 1:
The patent applies dynamics by making the speed limit adaptive rather than fixed. The system dynamically adjusts the maximum speed limit based on detected driving conditions such as downhill slopes, allowing the speed limit to vary in response to environmental factors. This enables the vehicle to exceed the normal speed limit temporarily when physics (gravity on downhill) naturally reduces fuel consumption, while still maintaining compliance under normal conditions.
Solution Approach 2:
The system changes the parameter of the speed limit itself based on detected conditions. When a downhill slope is detected, the maximum speed parameter is temporarily increased above the standard limit. This parameter change allows the vehicle to utilize gravitational acceleration to reduce engine load and fuel consumption, while the system continuously monitors to ensure the speed remains within safe and legal boundaries.
2Reliability
If the actual vehicle speed is restricted to vary within a narrow predetermined interval to ensure compliance with speed limits, then speed limit compliance is improved, but driveability deteriorates
Solution Approach 1:
The system dynamically adapts the speed limit to match driving conditions, making the vehicle respond more naturally to the environment. On downhill slopes, the vehicle is permitted to accelerate naturally without aggressive braking, providing a more intuitive and comfortable driving experience while maintaining overall compliance with speed limits through continuous monitoring and adjustment.
Solution Approach 2:
The vehicle's cruise control system automatically detects and adapts to terrain conditions without requiring driver intervention. The system self-adjusts the speed limit parameter based on detected downhill slopes, allowing the vehicle to serve itself by making intelligent speed adjustments that improve driveability while maintaining compliance, without the driver needing to manually adjust settings.
3Use of energy by moving object
If the maximum speed limit is set low to ensure fuel efficiency, then fuel consumption is reduced, but the ability to maintain optimal speeds for driveability deteriorates
Solution Approach 1:
The system transforms the static, fixed speed limit into a dynamic parameter that automatically adapts to terrain conditions. By detecting downhill slopes and temporarily increasing the maximum speed limit during these conditions, the system maintains fuel efficiency during normal operation while gaining the adaptability to optimize performance when physical conditions (gravity assistance) are favorable.
Solution Approach 2:
The patent implements parameter changes by modifying the maximum speed limit value based on detected conditions. The system monitors terrain and adjusts the speed parameter upward during downhill sections where gravitational force naturally reduces engine workload, thereby maintaining fuel efficiency while improving speed adaptation capability and overall vehicle versatility.
Data Source
AI summary
The present invention provides a system for the control of an actual speed for a vehicle, wherein the system is arranged to be able to carry out the control based on a manual control of the actual speed or based on an automatic control of the actual speed. According to the present invention, an automatic control device is arranged to permit that the automatic control may actively control the actual speed to a higher value than a manual control device is arranged to permit the manual control to actively control the actual speed to.