HEV Engine Clutch Lock-Up Control During Reverse Driving
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Solution Overview
Problem
Hybrid electric vehicles (HEVs) with transmissions without a reverse (R) gear face challenges in preventing reverse rotation of the engine and forward movement when the engine clutch is stuck in a lock-up state during reverse driving.
Innovation Solution
A control method is implemented in the hybrid electric vehicle to determine the state of the engine clutch by monitoring the rotation of the driving sources connected to the clutch. When the clutch is determined to be in a lock-up failure state or unknown state, the system prevents reverse driving and controls the transmission to be in a neutral position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine clutch is in a lock-up state during reverse driving, then the connection between motor and engine is stable, but reverse rotation of the engine and forward movement cannot be prevented
Solution Approach 1:
The transmission system dynamically switches between different operational states (neutral position and reverse driving position) based on the detected clutch condition. When clutch lock-up is detected during reverse driving, the system transitions to neutral position to prevent engine reverse rotation, and allows reverse driving when clutch is properly engaged, optimizing both safety and functionality
Solution Approach 2:
The control unit continuously monitors the clutch engagement state through feedback signals from sensors and actively controls the transmission position based on this feedback. This closed-loop control ensures that the transmission position matches the actual clutch state, preventing harmful reverse rotation while maintaining stable connection when appropriate
2Object-affected harmful factors
If the transmission is controlled to neutral position when clutch lock-up is detected, then engine reverse rotation is prevented, but reverse driving capability is lost
Solution Approach 1:
The transmission position is dynamically adjusted based on real-time clutch state detection. The system transitions to neutral position only when clutch lock-up is detected during reverse driving, and returns to reverse driving position when clutch engagement is confirmed, providing adaptive control that prevents engine damage while maintaining driving capability
Solution Approach 2:
The control unit detects clutch lock-up condition in advance during reverse driving and proactively transitions the transmission to neutral position before engine reverse rotation can occur. This preliminary protective action prevents harmful effects while the system monitors for clutch engagement to restore reverse driving capability
Data Source
AI summary
A hybrid electric vehicle includes a transmission without a reverse gear and a control method thereof. A situation in which a connection between the motor and the engine is stuck is overcome. When a predetermined condition is met, whether or not an engine clutch is in a specific state is determined. A first driving source is disposed on one end of the engine clutch, and a second driving source is disposed on the other end of the engine clutch. When the engine clutch is in the specific state, reverse driving is prevented. A transmission is controlled to be in a neutral position.