Automated Transmission Shifting Optimization via Runtime Adaptation
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Solution Overview
Problem
Automated transmission shifting processes are affected by manufacturing tolerances and wear-related changes over time, leading to suboptimal shifting quality due to fixed initial application principles that do not account for settling and aging effects.
Innovation Solution
Implement a continuous runtime adaptation method that optimizes shifting parameters based on real-time evaluation indices, allowing the transmission to self-adjust and improve shifting behavior without relying on test cycles, by calculating idealized rotational speeds and adjusting control parameters to minimize deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a basic application principle is determined at the beginning of transmission life, then initial shifting quality is achieved, but shifting quality deteriorates over time due to wear and settling effects
Solution Approach 1:
The patent implements dynamic adaptation of the application principle by continuously monitoring actual rotational speed deviations during shifting operations and adjusting control parameters in real-time. This transforms the static basic application principle into a dynamic system that automatically compensates for wear and settling effects throughout the transmission's service life, resolving the contradiction between initial performance and long-term reliability.
Solution Approach 2:
The system employs feedback mechanisms by measuring actual rotational speed during shifting operations, comparing it with idealized rotational speed, and using the deviation signals to continuously optimize control parameters. This closed-loop feedback ensures shifting quality is maintained despite aging effects, addressing the contradiction between initial setup and long-term performance.
2Measurement precision
If teach-in routines are used to determine application principles, then shifting parameters are optimized at specific operating points, but the system cannot adapt to changes throughout the transmission's life
Solution Approach 1:
The patent replaces discrete teach-in routines with continuous optimization that operates throughout the transmission's service life. By continuously monitoring shifting operations and adapting control parameters in real-time, the system maintains optimization across all operating conditions rather than relying on periodic teach-in cycles, thereby achieving both precision and adaptability.
Solution Approach 2:
The system performs self-optimization by automatically detecting deviations from idealized rotational speed and adjusting its own control parameters without external intervention. This self-service capability eliminates the need for manual teach-in routines and enables continuous adaptation to aging effects throughout the transmission's life.
3Productivity
If extrapolation with offsets and performance characteristics is used, then the application principle is extended to the working range, but deterioration due to wear is not accounted for
Solution Approach 1:
The system uses real-time feedback from actual rotational speed measurements to continuously update control parameters across the entire working range. This replaces static extrapolation with dynamic adaptation that accounts for wear and settling effects, maintaining shifting quality consistency throughout the transmission's service life while preserving full working range coverage.
Data Source
AI summary
A method of optimizing shifting of a shifting element which fixes a shaft to another component of the drive-train. Three shifting processes are influenced by respective characteristic forms of a control parameter. The first and second characteristic forms are different from one another. Each shifting process has a distinct start and end time (tBeginn, tEnde). The rotational speed of the shaft is a function n(t) of time t. An idealized rotational speed nideal(t):=G{n(t)} is determined by a filter G. First and second evaluation indexes I:=I(t−Δt,t)/I (tBeginn−t, tBeginn) are calculated, in which tBeginn<t≦tEnde. I(ta, tb) is a measure of a deviation of the rotational speed n(t) from the idealized rotational speed nideal(t) over time [ta,tb]. The third characteristic form is chosen based on the first and second evaluation indexes I.