Coasting Control Device Low Mu Road Recognition
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Solution Overview
Problem
Coasting control devices are ineffective on low μ roads due to instability in vehicle behavior, such as tire lock and slip, when the clutch is disengaged, leading to potential vehicle instability and the need for stabilization through engine or brake force.
Innovation Solution
A coasting control device that includes a low μ road running recognition unit, which uses speed sensors or ABS control units to detect low μ road conditions and prohibits coasting control to prevent vehicle instability, employing a coasting control determination map based on clutch rotation speed and accelerator opening degree to disengage the clutch only when conditions are met and safe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coasting control is executed by disengaging the clutch to save fuel, then fuel consumption is reduced, but vehicle stability deteriorates on low μ roads due to tire lock and slip
Solution Approach 1:
The coasting control determination map is used to predict and evaluate coasting control feasibility before actually executing coasting control. By assessing clutch rotation speed, accelerator opening degree, and other parameters in advance, the system determines whether coasting control should be permitted, preventing instability issues from occurring in the first place
Solution Approach 2:
The system continuously monitors clutch rotation speed, accelerator opening degree, and vehicle operating conditions, feeding this information back to the coasting control determination map. Based on this feedback, the system dynamically adjusts whether to permit or prohibit coasting control, ensuring vehicle stability while maximizing fuel savings
2Loss of energy
If the clutch is disengaged during coasting control, then engine work is reduced to zero and fuel is saved, but vehicle behavior becomes unstable particularly during clutch engagement transitions
Solution Approach 1:
The coasting control determination map evaluates whether coasting control should be permitted before the clutch is disengaged. By assessing current operating conditions including clutch rotation speed and accelerator opening degree, the system ensures that coasting control is only initiated when vehicle behavior will remain stable
Solution Approach 2:
The system monitors changes in key parameters such as clutch rotation speed, accelerator opening degree, and vehicle speed to determine appropriate timing for clutch engagement and disengagement. By carefully controlling these parameter transitions, the system maintains vehicle stability while achieving fuel savings
Data Source
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AI summary
A coasting control device capable of avoiding coasting control during running on low µ roads is provided. A low µ road running recognition unit 4 which recognizes that a vehicle is running on a low µ road and a unit 5 for prohibiting coasting control during low µ road running when the low µ road running recognition unit recognizes that the vehicle is running on a low µ road are provided.