Coasting Control Device Turning Recognition Clutch Engagement
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Solution Overview
Problem
Coasting control during vehicle turning is undesirable as it can cause instability due to lateral acceleration, necessitating engine driving force or brake engagement for stabilization, which existing coasting control systems fail to avoid.
Innovation Solution
A coasting control device with a turning recognition unit that disengages the clutch and lowers engine RPM only when the vehicle is not turning, using a coasting control determination map to initiate and terminate coasting control based on clutch rotation speed and accelerator opening degree, and prohibiting coasting control during turning by recognizing wheel speed differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coasting control is executed by disengaging the clutch to reduce fuel consumption, then fuel efficiency is improved, but vehicle stability deteriorates during turning due to lateral acceleration
Solution Approach 1:
The control device continuously monitors vehicle speed and steering angle through sensors, and uses this feedback information to dynamically adjust clutch engagement status. When turning is detected (steering angle exceeds threshold), the system automatically engages the clutch to maintain stability, otherwise disengages for fuel savings.
Solution Approach 2:
The system dynamically adjusts clutch engagement based on real-time driving conditions rather than maintaining a fixed state. The clutch control unit changes engagement status according to varying vehicle speed and steering angle conditions, making the system adaptable to different driving scenarios.
2Loss of energy
If the clutch is disengaged during high-speed turning, then fuel consumption is reduced, but vehicle behavior becomes unstable due to centrifugal force
Solution Approach 1:
The system uses steering angle sensors to detect when the vehicle is turning, and based on this feedback, automatically engages the clutch to maintain reliable vehicle control during turns, preventing unstable behavior.
Solution Approach 2:
The control device engages the clutch before unstable vehicle behavior can occur by detecting turning conditions in advance through steering angle monitoring, ensuring stability is maintained proactively rather than reactively.
3Stability of the object's composition
If the clutch is continuously engaged to maintain vehicle stability during turning, then vehicle control is improved, but fuel consumption increases due to idle engine operation
Solution Approach 1:
The system dynamically switches clutch engagement status based on driving conditions - engaged during turns for stability, disengaged during straight driving for fuel savings - optimizing both stability and energy efficiency across different operating conditions.
Solution Approach 2:
The control strategy applies different clutch engagement requirements to different driving situations: stable engagement during turning maneuvers versus disengaged state during normal cruising, making the control approach context-specific rather than uniform.
4Loss of energy
If the engine is maintained at idle RPM during coasting control, then fuel waste is reduced, but engine noise increases making it audible to drivers
Solution Approach 1:
The system dynamically adjusts engine RPM based on driving conditions - maintaining idle RPM during coasting for fuel savings, but increasing RPM when clutch engagement is required for turning, thereby managing noise levels according to operational needs.
Data Source
AI summary
A coasting control device capable of avoiding coasting control during turning is provided. A turning recognition unit that recognizes that a vehicle is turning and a unit for prohibiting coasting control during turning that prohibits coasting control when the turning recognition unit recognizes that the vehicle is turning are provided.