AMT Sleeve Clamping Control via Adaptive Pushing Load
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Solution Overview
Problem
Automated Manual Transmissions (AMTs) face challenges in ensuring timely and effective clamping of sleeves to free rotatable gears, leading to potential drivability issues and transmission damage due to delayed shift operations and sticking phenomena caused by insufficient pushing load or lubrication issues.
Innovation Solution
A control system that includes balk abutment determination means to assess if the sleeve stays within a predetermined range and pushing load increasing means to enhance the pushing load when necessary, ensuring proper clamping and synchronizing of sleeves with free rotatable gears, and retry control mechanisms to address sticking and synchronization failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve pushing load is once diminished to release sticking, then the sleeve can be moved again, but the shift operation is delayed and drivability worsens
Solution Approach 1:
The control system dynamically adjusts the pushing load based on real-time detection of shift operation status. When sleeve sticking is detected, the load is temporarily reduced to release the sticking, then immediately increased again to complete the shift, creating an adaptive load profile rather than a static one
Solution Approach 2:
The control system continuously monitors shift operation progress and detects when the sleeve fails to move to the target position. This feedback triggers automatic adjustment of the pushing load - first reducing it to release sticking, then increasing it to complete the shift, forming a closed-loop control system
2Speed
If the sleeve pushing load is increased to effect quick clamping, then shift speed improves, but the sleeve may stick to the balk ring due to insufficient lubrication
Solution Approach 1:
The control system applies pushing load in a staged manner - first with an initial load to move the sleeve toward the target, then with an increased load only when needed to complete the clamping. This preliminary action with moderate load reduces the risk of immediate sticking while still achieving the shift goal
Solution Approach 2:
The control system changes the pushing load parameter dynamically during the shift operation. It starts with a baseline load, detects insufficient progress, then adjusts the load parameter upward to overcome resistance, and finally adjusts it again based on whether the shift is complete, optimizing both speed and reliability
3Productivity
If the sleeve pushing load is maintained at high level, then clamping is achieved quickly, but the load on the shift actuator mechanism increases
Solution Approach 1:
The control system applies pushing load selectively - using high load only when and where needed to complete the clamping operation, rather than maintaining high load throughout the entire shift process. This partial application of excessive force achieves the goal while minimizing overall actuator stress
Data Source
AI summary
A worsening of drivability is to be kept to a minimum by making a fail-safe control taking the state in the event of failure of a shifting operation into account. When clamping a sleeve to a free rotatable gear and during the period after instructing movement of the sleeve to a clamping position until movement of the sleeve to a predetermined positional range which makes it possible to judge that the sleeve has been clamped to the free rotatable gear, a pushing load for the sleeve is increased if the sleeve is in a fixed state near the balk ring, while if the sleeve is in a fixed state near the free rotatable gear, the sleeve is once returned to a neutral position thereof and is re-clamped to the free rotatable gear. Further, the number of times the sleeve is re-clamped to the free rotatable gear is counted and the use of the free rotatable gear is inhibited in accordance with the counted number of times.