Automatic Transmission Shift Controller Clutch Durability
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Solution Overview
Problem
Conventional automatic transmission control devices face durability issues with the dog clutch when a new shift request is generated during the shift control from low gear speed to high gear speed, leading to excessive torque on the clutch, which can decrease its durability.
Innovation Solution
The control device continues the shift control in response to the initial shift request after determining the engaging clutch has started to release, disregarding subsequent shift requests to prevent reengagement and thus avoid excessive torque on the clutch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the shift controller responds to a new shift request by reengaging the dog clutch during shift control from low gear to high gear, then the transmission can quickly adapt to changing driving conditions, but excessive torque acts on the dog clutch causing durability deterioration
Solution Approach 1:
The control device determines the releasing start of the engaging clutch in advance before actually completing the release. By detecting this preliminary state and using it as a trigger to ignore subsequent engagement requests, the system proactively prevents the harmful reengagement scenario before it can occur, thus protecting clutch durability while maintaining normal adaptability
Data Source
AI summary
A control device for an automatic transmission disposed in a vehicle driving system, the automatic transmission having an engaging clutch as shift element, has a shift controller that performs a shift control of the automatic transmission. The shift controller is configured such that, during a shift control to release the engaging clutch in response to a first shift request and after determination of a releasing start of the engaging clutch, when a second shift request to engage the engaging cutch is generated, the shift control in response to the first shift request will be continued.