Hybrid Vehicle Reverse Control via Clutch State Detection
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Solution Overview
Problem
Hybrid electric vehicles with transmissions lacking a reverse (R) stage face challenges in determining the connection state between the engine and motor, leading to uncertainties that prevent R-stage driving, especially when the engine clutch state is unknown.
Innovation Solution
A control method for hybrid electric vehicles that determines the engine clutch state by monitoring the rotation of one driving source when another is active, allowing or prohibiting R-stage driving based on the clutch's open or closed state, ensuring safe operation by preventing reverse engine rotation or forward movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmission is designed without a reverse (R) stage to simplify the transmission structure, then the transmission complexity is reduced, but the vehicle cannot perform reverse operation when the engine clutch state is unknown
Solution Approach 1:
The control unit acts as an intermediary that mediates between the driver's reverse gear selection and the actual reverse driving execution. It monitors the engine clutch state and condition parameters, and only allows reverse driving when conditions are safe, thus enabling reverse capability without a mechanical R stage while maintaining safety
Solution Approach 2:
The system dynamically adjusts the availability of reverse driving based on real-time monitoring of engine clutch state and vehicle conditions. The reverse driving function is not statically enabled or disabled, but dynamically controlled based on whether the engine clutch is open, vehicle speed, and other parameters
2Adaptability or versatility
If reverse driving is permitted when the engine clutch state is unknown, then the reverse driving capability is improved, but the risk of unintended engine rotation or forward movement increases
Solution Approach 1:
Before allowing reverse driving, the control unit performs preliminary checks of multiple conditions including engine clutch state, vehicle speed, and gear position. This preliminary verification ensures that reverse driving is only permitted when safe, preventing unintended engine rotation or forward movement
Solution Approach 2:
The control unit continuously monitors engine clutch state and vehicle operating parameters during reverse driving, providing real-time feedback control. If the engine clutch closes or abnormal conditions occur during reverse driving, the system immediately terminates reverse operation, ensuring ongoing safety
3Reliability
If the engine clutch state is continuously monitored to ensure safe reverse driving, then the operational safety is improved, but the control system complexity increases
Solution Approach 1:
The control unit performs multiple functions including engine clutch state monitoring, condition parameter evaluation, reverse driving permission control, and real-time safety monitoring. By consolidating these functions into a single control unit, the patent avoids adding separate monitoring devices while achieving comprehensive safety control
Data Source
AI summary
Disclosed are a hybrid electric vehicle having a transmission without a reverse (R) stage and capable of coping with a situation in which a connection state between a motor and an engine is unknown, and a control method thereof. The method includes, if a preset condition is satisfied in a situation where a state of an engine clutch is unknown, driving any one of a first driving source disposed at one end of the engine clutch and a second driving source disposed at the other end of the engine clutch, determining whether the other one of the first driving source and the second driving source rotates, and determining whether the engine clutch is opened depending on the determination result.