Transmission Control Device Parameter Segmentation for Hybrid Drivetrain Gearshifts
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Solution Overview
Problem
Existing transmission control devices lack the ability to optimally control gearshifts during both purely electric motor power and hybrid driving modes due to changes in drivetrain mass moment of inertia, which affects gearshift performance.
Innovation Solution
Storing duplicate sets of parameters in the transmission control device, specifically for electric motor-only and hybrid driving modes, to account for the varying mass moment of inertia and coordinate gearshifts effectively between the internal combustion engine and electric motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single set of parameters is stored for gearshift control, then the device complexity is reduced, but the gearshift control accuracy deteriorates under different driving modes
Solution Approach 1:
The parameter set is segmented into mode-specific subsets: parameters for electric motor-only driving and parameters for hybrid driving. The control device selects and applies the appropriate parameter subset based on the current driving mode, ensuring accurate gearshift control for each mode without requiring a single compromised parameter set
Solution Approach 2:
Multiple parameter sets are pre-calculated and stored in the control device for different driving modes. The system performs preliminary preparation by storing both electric motor-only parameters and hybrid driving parameters, so that when a mode change occurs, the appropriate parameters are already available for immediate application
2Reliability
If parameters are optimized for hybrid driving mode, then gearshift performance during hybrid operation is improved, but gearshift performance during electric motor-only driving deteriorates
Solution Approach 1:
The control device dynamically adapts its behavior by selecting different parameter sets based on the current driving mode. When hybrid driving is detected, the hybrid-optimized parameters are applied; when electric motor-only driving is detected, the electric motor-specific parameters are applied. This dynamic adaptation ensures optimal gearshift performance for each mode without compromise
Data Source
AI summary
A transmission control device (7) of a transmission (3) for a drivetrain which includes, in addition to the transmission (3), a hybrid drive with an internal combustion engine (1) and an electric motor (2). The transmission control device (7) stores parameters which form the basis of the manner with which gearshifts are controlled or regulated. At least some parameters are stored in duplicate, firstly, for operating the transmission (3) under purely electric-motor power using only the electric motor (2), and secondly for operating the transmission (3) during hybrid driving using both the internal combustion engine (1) and the electric motor (2).