Hybrid Powertrain Mode Switching with Torque-Speed Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hybrid electric vehicles face challenges in efficiently and smoothly switching between series and parallel driving modes due to complex clutch control and motor configurations, leading to inefficiencies in fuel consumption and performance.
Innovation Solution
A method for controlling driving mode switching in hybrid electric vehicles that adjusts engine torque and rotation speed to match the driving motor's state before engaging or disengaging the clutch, ensuring seamless transitions between series and parallel modes by synchronizing torque and rotation speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent series-parallel switching control is implemented to meet varying vehicle operating conditions, then adaptability is improved, but system complexity and control difficulty increase
Solution Approach 1:
The control method performs preliminary actions by pre-adjusting engine torque and driving motor torque before clutch engagement/disengagement. The controller calculates target torque values for the engine and driving motor in advance, ensuring that torque balance is achieved before the switching action occurs. This preliminary torque coordination prevents power interruptions and simplifies the switching control process.
Solution Approach 2:
The control system continuously monitors the operating state of the hybrid electric vehicle and uses feedback to determine appropriate switching timing. The controller adjusts engine torque and driving motor torque based on real-time feedback from vehicle sensors, ensuring smooth transitions between series and parallel modes while adapting to varying operating conditions.
2Stability of the object's composition
If engine torque and rotation speed are adjusted to match driving motor state before clutch engagement, then switching smoothness is improved, but control time and coordination complexity increase
Solution Approach 1:
The controller performs preliminary torque adjustment by calculating and applying target torque values for the engine and driving motor before clutch engagement. This ensures that torque balance is achieved in advance, preventing power interruptions during switching while minimizing the time required for coordination.
Solution Approach 2:
The control method dynamically adjusts engine torque and driving motor torque parameters to match the operating state before switching. By changing these parameters in a coordinated manner, the system achieves smooth transitions while optimizing the time required for torque coordination.
3Loss of energy
If electric generator torque is reduced to zero during series-to-parallel switching, then energy loss is reduced, but torque transfer continuity may be affected
Solution Approach 1:
Before reducing electric generator torque to zero, the controller performs preliminary adjustments by increasing engine torque and driving motor torque to compensate for the upcoming torque reduction. This ensures that total torque output remains continuous throughout the switching process, preventing power interruptions while allowing the electric generator to be disengaged.
Data Source
Figure 1
Figure 2
AI summary
A method for controlling driving mode switching of a hybrid electric vehicle, the method comprising: when the driving mode of a hybrid electric vehicle is switched from a series driving mode to a parallel driving mode, adjusting a torque of an engine (1) to a target torque in the parallel driving mode, and adjusting the rotation speed of the engine to be the same as the current rotation speed of a driving electric motor (4); closing a clutch (3); and reducing a torque of an electric generator (2) to zero and synchronously reducing a torque of the driving electric motor by an adjustment amount of the torque of the electric generator; and when the driving mode of the hybrid electric vehicle is switched from the parallel driving mode to the series driving mode, increasing the torque of the electric generator to absorb the torque of the engine, and transferring, to the driving electric motor and with the same amplitude, the torque absorbed by the electric generator; releasing the clutch; and adjusting the torque and the rotation speed of the engine to a target torque and a target rotation speed of the engine in the series driving mode respectively. Also disclosed are a vehicle and a storage medium.