Hybrid Power System Series-Parallel Mode Switching Control
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Solution Overview
Problem
Hybrid power vehicles experience sudden thrust or jerk during mode switching from series to parallel or parallel to series, causing discomfort due to insufficient switching fluency, leading to pitching movements.
Innovation Solution
A series-parallel coupling control method that adjusts the rotation speed and torque of power sources to smoothly transition between modes by connecting or disconnecting power sources and adjusting torque rates, ensuring synchronized operation to prevent sudden changes in power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hybrid power system switches from series mode to parallel mode or from parallel mode to series mode, then the power delivery changes from one power source to two power sources or vice versa, but this causes sudden thrust or jerk due to insufficient switching fluency
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the rotation speeds of power sources before mode switching occurs. Specifically, before switching from series to parallel mode, the system adjusts the rotation speed of the second power source to match the first power source, and before switching from parallel to series mode, it adjusts the rotation speed of the first power source to match the second power source. This preliminary speed synchronization prevents sudden thrust or jerk during mode transitions, thereby improving switching fluency while maintaining mode adaptability.
2Reliability
If the clutch is opened to convert to series mode when the clutch has poor joining or becomes too hot, then the clutch problems are avoided, but the vehicle loses the ability to operate in parallel mode
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the rotation speed parameter of power sources based on clutch condition. When the clutch is in poor joining state or overheated, the system changes the operating parameters (rotation speeds) of the power sources to enable smooth series mode operation. This allows the system to maintain reliability by avoiding clutch damage while preserving adaptability through the ability to switch between modes based on real-time clutch condition monitoring.
3Ease of operation
If the rotation speed of power sources is adjusted to achieve smooth mode switching, then sudden thrust and jerk are avoided, but the control complexity increases
Solution Approach 1:
The patent applies feedback by continuously monitoring the rotation speeds of power sources and using this information to adjust the speeds before mode switching. The control system receives feedback on the current rotation speeds, compares them with the target speeds required for smooth switching, and makes real-time adjustments. This feedback mechanism enables smooth mode transitions while keeping control complexity manageable through a systematic approach to speed regulation.
Data Source
AI summary
A series-parallel coupling control method and system for a hybrid driver are suitable for a hybrid power vehicle. The hybrid driver is used to produce a driving force to drive a load. The hybrid driver includes a first power generation unit, a second power generation unit, and a main controller. The main controller selectively controls the system to drive the load in a series power coupling mode or a parallel power coupling mode. The main controller switches between the series coupling mode and the parallel coupling mode by using rotation speed compensation or torque/power compensation. Therefore, the driven load will not suffer from sudden thrust or jerk.