Cruise Control Speed Deviation Adaptation
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Solution Overview
Problem
Cruise control systems, particularly 'look-ahead' cruise controls, often limit drivers' ability to prioritize certain vehicle speeds over fuel efficiency in specific driving situations, such as overtaking, leading to unsatisfactory driving experiences and potential safety issues.
Innovation Solution
Implementing a method that limits the permissible deviation between the set speed and the reference speed during and after detected specific driving situations, allowing the cruise control to behave more intuitively like an experienced driver, thereby enabling safe and efficient overtaking maneuvers and addressing other driving scenario challenges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the cruise control allows large deviation between set speed and reference speed to save fuel, then fuel efficiency is improved, but driver satisfaction and safety deteriorate due to unnatural driving behavior
Solution Approach 1:
The system dynamically adjusts the reference speed based on detected driving situations. When a specific driving situation is detected, the deviation between set speed and reference speed is limited, making the cruise control behave more naturally. When no specific situation is detected, larger deviations are permitted to optimize fuel consumption. This dynamic adaptation resolves the contradiction between fuel efficiency and driver satisfaction.
Solution Approach 2:
The system changes the parameter of permissible speed deviation based on the detected driving situation. By monitoring driving patterns and situational context, the system adjusts the reference speed parameter to either allow fuel-saving deviations or constrain them to match natural driving behavior, thereby resolving the contradiction between energy efficiency and ease of operation.
2Reliability
If the cruise control maintains strict adherence to set speed for safety, then safety is improved, but fuel efficiency deteriorates due to inability to exploit running resistance variations
Solution Approach 1:
The system dynamically determines the level of speed adherence based on the detected driving situation. In normal conditions, the system allows reference speed to deviate from set speed to exploit running resistance variations and save fuel. When specific driving situations are detected, the system increases adherence to set speed to ensure safety. This dynamic adjustment resolves the contradiction between safety and fuel efficiency.
Solution Approach 2:
The system changes the parameter of speed deviation permission based on situational context. By analyzing driving situations, the system adjusts how strictly the reference speed must adhere to the set speed, allowing greater flexibility for fuel efficiency in normal conditions while maintaining strict adherence for safety in specific situations.
3Use of energy by moving object
If the cruise control allows reference speed to drop below set speed before downgrades to save fuel, then fuel efficiency is improved, but driving performance deteriorates due to delayed acceleration response
Solution Approach 1:
The system dynamically adjusts the reference speed behavior based on detected driving situations. When specific situations indicating need for acceleration response are detected, the system prevents reference speed from dropping below set speed, ensuring rapid acceleration response. In other conditions, the system allows reference speed to drop to save fuel. This dynamic adjustment resolves the contradiction between fuel efficiency and acceleration response.
Solution Approach 2:
The system changes the parameter of permissible reference speed deviation based on driving situation detection. By analyzing whether the driving situation requires rapid acceleration response, the system adjusts whether reference speed is allowed to drop below set speed, thereby resolving the contradiction between fuel efficiency and speed response characteristics.
Data Source
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AI summary
The present invention relates to a method and a system for control of a cruise control, which cruise control supplies a reference speed v ref for control of a propulsion system. The reference speed v ref is here based on a set speed v set chosen by a driver of a vehicle which is provided with the propulsion system, and it is possible for said cruise control to allow deviation between the reference speed v ref and the set speed v set . The present invention detects whether there is at least one particular driving situation, this detection being based on how the driver acts when the vehicle is in motion. If there is at least one particular driving situation, a first limitation of the permissible deviation is applied during the at least one particular driving situation. According to the invention, a second limitation of the permissible deviation is also applied during a period of time T A after the end of the at least one particular driving situation.