Multi-Disc Lock-Up Clutch Control Device Timing
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Solution Overview
Problem
In vehicle transmissions with multi-disc lock-up clutches, overlapping shift control and lock-up clutch engagement control timing leads to decreased fuel efficiency and direct steering feeling, and compromises the precision of lock-up clutch engagement hydraulic pressure learning control.
Innovation Solution
A control device that limits or prohibits lock-up clutch engagement control during certain shift stages, allowing precise hydraulic pressure learning control after shift completion, thereby minimizing fuel efficiency and steering feeling degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lock-up clutch engagement control is delayed until shift control completion, then learning control precision is improved, but fuel efficiency performance and direct steering feeling deteriorate
Solution Approach 1:
The patent applies dynamics by making the lock-up clutch engagement timing adaptive rather than fixed. The control device dynamically adjusts engagement timing based on whether shift control is being executed, allowing engagement during shift operations when appropriate while delaying only when necessary for learning precision. This dynamic adjustment resolves the contradiction between maintaining learning precision and preserving fuel efficiency.
2Use of energy by moving object
If lock-up clutch engagement control is executed during shift control, then fuel efficiency performance and direct steering feeling are improved, but learning control precision deteriorates due to turbine speed fluctuation
Solution Approach 1:
The patent applies preliminary action by checking the shift control execution status before initiating lock-up clutch engagement. When shift control is not being executed, the system performs preliminary engagement to improve fuel efficiency. When shift control is active, the system preliminarily determines that engagement should be delayed to avoid turbine speed fluctuations that would compromise learning precision. This preliminary assessment resolves the contradiction by proactively adjusting timing based on system state.
3Measurement precision
If lock-up clutch engagement control is limited in shift stage before execution, then learning control precision is guaranteed, but engagement response timing is delayed
Solution Approach 1:
The patent applies dynamics by making the engagement limitation adaptive rather than constant. The control device dynamically removes the limitation on lock-up clutch engagement in shift stages before execution when shift control is not being executed, allowing timely engagement to improve response timing. The limitation is applied only when shift control is active and learning precision is at risk. This dynamic approach resolves the contradiction between learning precision and engagement response timing.
Data Source
AI summary
Lock-up clutch engagement hydraulic pressure learning control can be precisely performed by starting lock-up clutch engagement control and executing the lock-up clutch engagement hydraulic pressure learning control after execution of shift control is completed, in a case where the lock-up clutch engagement control is limited in a shift stage before execution of the shift control, when the shift control is executed in a state where a multi-disc lock-up clutch is released. Meanwhile, a decrease in fuel efficiency performance and a direct steering feeling is minimized by starting the lock-up clutch engagement control during shift control in a case where the lock-up clutch engagement control is not limited.