Hybrid Propulsion Control Mode Switching
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Solution Overview
Problem
Existing hybrid propulsion systems face delays in powertrain dynamics due to sequential management of engine start and gear shift operations, which cannot adapt dynamically to changing driver requirements, leading to inefficient performance and responsiveness.
Innovation Solution
A method that allows switching between different operating modes during ongoing operations, enabling parallelization of engine start and gear shift, and dynamically adjusting control strategies based on current powertrain state and driver inputs, thereby optimizing engine start and gear shift operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If engine start and gear shift operations are managed sequentially, then system complexity is reduced and control is simplified, but powertrain response time increases and productivity decreases
Solution Approach 1:
The control system dynamically adjusts the operating mode (sequential or parallel) based on real-time driver requirements and powertrain state, rather than being fixed. This allows the system to optimize between complexity and response speed by selecting parallel operation when rapid response is needed and sequential operation when simplicity suffices
2Productivity
If engine start and gear shift are executed in parallel, then powertrain response speed improves, but control complexity increases and reliability may deteriorate
Solution Approach 1:
The control system performs preliminary assessment of driver requirements and powertrain state before executing parallel operations. By predicting the need for simultaneous engine start and gear shift based on current conditions, the system prepares control strategies in advance, reducing the complexity burden during actual execution while maintaining fast response
3Ease of operation
If the control strategy is determined at the start of operations, then control simplicity is maintained, but adaptability to changing driver requirements deteriorates
Solution Approach 1:
The control system continuously monitors powertrain state and driver inputs throughout the operation sequence, using feedback to dynamically adjust control strategies. This allows the system to maintain simplicity in normal operation while adapting to changing requirements when detected, resolving the contradiction between ease of operation and adaptability
Data Source
AI summary
A method of controlling a vehicle hybrid propulsion system is provided. The propulsion system includes an internal combustion engine, first and second clutches, an electric motor, and a gearbox having an input shaft and an output shaft connected to drive wheels. The method includes a first operating mode of starting the engine by the motor, a second operating mode of actuating a gear shift, and a third operating mode which actuates starting of the engine and the gear shift. The method includes passing from the first to the third operating modes even if starting of the engine has not been completed, or passing from the second to the third operating modes even if actuation of the gear shift has not been completed, so that the transition from one operating mode to another can be freely actuated at any time, depending upon operating conditions of the hybrid propulsion system.