Automated Manual Transmission Reference Position Setting
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Solution Overview
Problem
Conventional automated manual transmissions require position sensors to accurately recognize the position of shifting actuators, increasing costs and package weight, and existing initialization methods are not guaranteed to place fingers at reference positions accurately, leading to noise and inefficiency.
Innovation Solution
A reference position setting method that moves a finger simultaneously in selecting and shifting directions, checks for diagonal movement, and adjusts to choose a reference position, minimizing relative movement and noise, allowing for accurate and rapid initialization without sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position sensor is used to recognize the position of the finger, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the motor's own operation characteristics and built-in sensors to determine finger position, eliminating the need for separate position sensors. The controller calculates position based on motor rotation data and gear ratios, making the system self-sufficient without external measurement devices.
Solution Approach 2:
The patent replaces the mechanical position sensor system with a computational approach using motor operation data and mathematical calculations. The position is determined through software algorithms based on motor rotation counts and gear ratios rather than physical sensors.
2Measurement precision
If the finger is moved to the reference position during initialization, then measurement precision is improved, but noise and operation time increase
Solution Approach 1:
Instead of moving the finger to the extreme reference position, the system moves it only partially to a position that provides sufficient measurement accuracy without triggering noise-generating contacts. This partial action achieves the necessary precision while avoiding harmful effects.
Solution Approach 2:
The system rapidly moves the finger through the initialization process to a sufficient position without dwelling at extreme positions that generate noise. The quick traversal minimizes the time spent in noise-prone zones while still achieving accurate position recognition.
3Measurement precision
If the finger is moved to the reference position during initialization, then measurement precision is improved, but operation time increases
Solution Approach 1:
The system moves the finger only to the extent necessary for accurate position recognition rather than to the full reference position. This partial movement reduces initialization time while maintaining sufficient measurement precision for operational purposes.
Solution Approach 2:
The initialization process rapidly traverses to a sufficient position without unnecessary delays or extreme movements. The quick positioning achieves adequate accuracy for fast system startup and operation.
Data Source
AI summary
A reference position setting method for an automated manual transmission is allowed to initialize an accurate reference position while minimizing relative movement of a finger, and to reduce noise generated when the finger moves to an end of a shifting direction to secure quieter and faster operation capability.