Hybrid Transmission Shift Control for Unavailable Gear Faults
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Solution Overview
Problem
When a vehicle's gear shift is required but the hybrid transmission malfunctions, causing the unavailable gear, it typically shuts down the engine, leading to engine power loss and vehicle stalling, degrading driving safety.
Innovation Solution
A control method and device that determine a first gear to shift to based on state information and preset conditions, allowing the vehicle to switch to a suitable drive mode and gear to avoid power loss, ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle shuts down the engine when the required gear is unavailable during gear shift, then the gear shift problem is avoided, but engine power is lost and vehicle stalling occurs, degrading driving safety
Solution Approach 1:
The system dynamically adjusts the drive mode based on real-time gear availability. When the required gear is unavailable, the system transitions from the original drive mode to an alternative drive mode that can operate with available gears, maintaining vehicle power and preventing stalling while ensuring driving safety
Solution Approach 2:
The system changes the operational parameters by switching between different drive modes (e.g., from a mode requiring specific gear ratios to a mode that can operate with alternative gear configurations). This parameter change allows the vehicle to continue operating safely without engine shutdown
2Reliability
If the vehicle switches to a different drive mode and gear to avoid stalling, then driving safety is maintained, but the original gear shift action cannot be completed
Solution Approach 1:
The system performs preliminary detection of gear availability before executing the gear shift. When a gear is predicted to be unavailable, the system proactively switches to an alternative drive mode in advance, preventing the gear shift failure from occurring and maintaining both safety and operational continuity
3Ease of operation
If the vehicle maintains the current drive mode and attempts gear shift, then the original driving plan is followed, but vehicle stalling occurs when gear is unavailable
Solution Approach 1:
The system continuously monitors gear availability and vehicle operating conditions, using this feedback to determine whether to proceed with the original gear shift or switch to an alternative drive mode. This feedback mechanism ensures that driving safety is maintained while minimizing disruption to the driving plan
Data Source
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AI summary
The embodiments of the present application, which are applicable to the field of vehicle technologies, provide a control method for a vehicle, a device, and a vehicle. The method includes: determining a first gear to be shifted to when a target gear shift action is performed, where the target gear shift action includes one of a gear shift action when a drive mode of the vehicle remains unchanged and a gear shift action when the drive mode is switched; acquiring state information of the vehicle when the first gear is in a fault state; determining, based on the state information and a preset execution condition corresponding to the target gear shift action, a target vehicle control strategy; and controlling, based on the target vehicle control strategy, the vehicle. Using the above method, when the required gear during the gear shift action of the vehicle is unavailable, the drive mode may be switched to a suitable drive mode and a gear of the vehicle may be shifted to an available gear to avoid loss of vehicle power, thereby improving driving safety.