Hybrid Torque Intervention Control via Adaptive Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional torque intervention control methods for power split-parallel hybrid vehicles cause issues in vehicle operation by failing to deliver desired torque and causing the sun gear and carrier to spin freely, leading to offset reaction torques from motor generators.
Innovation Solution
A method that determines whether torque intervention is requested and controls driving sources to output a final requested torque by maintaining the current driving mode when the intervention time is short, or changing the mode when the time exceeds a reference, using a planetary gear set with specific torque allocation between motor generators based on driving modes like EVT, EV, and OD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If torque intervention is controlled by reducing torque of the second motor generator (MG2) as in TMED-type hybrid vehicle, then torque intervention is achieved, but engine reaction torque and reaction torque of the first motor generator (MG1) are offset causing problem in operating the vehicle
Solution Approach 1:
The patent applies dynamics by making the torque intervention control strategy adaptive based on the duration of the intervention request. When the torque intervention request time is short (below reference time), the system maintains the current driving mode while controlling torque. When the request time exceeds the reference time, the system changes to a driving mode corresponding to the final requested torque. This dynamic adjustment resolves the contradiction by adapting the control strategy to the specific operational context, preventing torque offset issues while ensuring vehicle operability.
Solution Approach 2:
The patent changes the control parameter from simply reducing MG2 torque to a more sophisticated approach that considers the torque intervention request time duration. By introducing the reference time parameter and adjusting the control strategy based on whether the intervention duration is below or above this threshold, the system optimizes torque distribution among driving sources. This parameter-based adaptation allows the system to achieve torque intervention while maintaining proper reaction torque balance for vehicle operability.
2Reliability
If torque intervention request time is short (below reference time) and current driving mode is maintained, then vehicle operability is preserved, but torque delivery may be insufficient without mode optimization
Solution Approach 1:
The patent applies partial action by implementing different levels of control intervention based on the duration of the torque intervention request. For short-duration requests (below reference time), the system applies a lighter control intervention by maintaining the current driving mode, which is sufficient for brief torque adjustments. For longer-duration requests (exceeding reference time), the system applies full intervention by changing to a driving mode optimized for the final requested torque. This graduated approach ensures vehicle operability is preserved for minor adjustments while providing adequate torque delivery when needed.
3Power
If torque intervention request time exceeds reference time and driving mode is changed, then optimal torque delivery is achieved, but vehicle operability may be affected by mode transition
Solution Approach 1:
The patent uses dynamics by implementing conditional mode transitions based on the torque intervention request time duration. The system dynamically evaluates whether the intervention duration exceeds the reference time threshold before deciding to change driving modes. This dynamic decision-making ensures that mode transitions occur only when necessary for sustained torque intervention requests, optimizing torque delivery while minimizing disruptions to vehicle operability. The conditional approach allows the system to adapt to varying operational requirements in real-time.
Data Source
AI summary
A method for controlling torque intervention in a power split-parallel hybrid vehicle comprises a determination step, in which whether the torque intervention for controlling the driving force of the vehicle is requested. Upon the torque intervention request, a driver's requested torque and an intervention torque for the torque intervention are determined in a decision step. When a torque intervention request time during which torque intervention is requested is below a reference time, each of driving sources is controlled together to output the driver's requested torque plus the intervention torque as a final requested torque on the basis of a current driving mode which is maintained as a driving mode just before the torque intervention is requested.