Hybrid Vehicle Torque Filtering for DCT Gradient Constraints
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Solution Overview
Problem
In hybrid vehicles with a P2 architecture, the actual total torque responses of the electric motor and engine exceed the limitation requirement of the gradient of torque change of the dual clutch transmission (DCT), affecting drivability.
Innovation Solution
A method for torque control in hybrid vehicles that determines a target-total-torque-change-gradient, which is the minimum of the DCT's torque change gradient and the front-axle's total-torque-request-filter-gradient, to filter the torque request of the electric motor and ensure the gradient of torque change meets the DCT's limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque request of the engine and electric motor are controlled independently with their own gradient limitations, then each power source can operate within its individual torque change limits, but the actual total torque response exceeds the DCT's gradient limitation requirement
Solution Approach 1:
The patent merges the independent torque control of the engine and electric motor into a unified total torque control system. The vehicle controller integrates both torque requests and applies a unified gradient limitation that accounts for the DCT's capabilities, ensuring the combined torque response remains within acceptable bounds while maintaining individual power source reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the vehicle controller continuously monitors the actual torque responses of both the engine and electric motor, compares the total torque gradient against the DCT's limitation requirements, and dynamically adjusts the torque distribution to prevent excessive gradient changes that would harm the DCT.
2Reliability
If the torque gradient limitation is applied strictly to ensure DCT protection, then the DCT is protected from excessive torque changes, but the drivability and responsiveness of the hybrid vehicle is degraded
Solution Approach 1:
The patent applies dynamic torque gradient limitation rather than a fixed constraint. The vehicle controller continuously adapts the torque distribution and gradient limits based on real-time operating conditions, vehicle state, and DCT status, allowing maximum drivability within safe boundaries while providing DCT protection when necessary.
Solution Approach 2:
The patent dynamically changes the torque gradient parameters based on operating conditions. The controller adjusts the allowable torque change rates of the engine and electric motor according to the current vehicle state, DCT conditions, and driving requirements, optimizing the balance between protection and drivability.
Data Source
AI summary
The present disclosure relates to a method for a torque control of a hybrid vehicle, a storage medium and an electronic device. The method includes: determining a target-total-torque-change-gradient when a limitation requirement for a gradient of torque change of a DCT is received; determining a torque request of an electric motor and an actual-torque-response-change-gradient of an engine; and determining a gradient of torque change of the electric motor according to the target-total-torque-change-gradient and the actual-torque-response-change-gradient of the engine; and filtering the torque request of the electric motor according to the gradient of torque change of the electric motor. The limitation of the gradient of torque change of the DCT is considered, A problem that the actual total torque responses of the electric motor and the engine exceeds the limitation requirement of the gradient of torque change of the DCT is effectively solved, and a drivability of the whole vehicle is improved.