Automatic Transmission Oil Pressure Learning Error Correction
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Solution Overview
Problem
Automatic transmission systems face learning errors due to individual differences in hydraulic friction engaging mechanisms and control valves, leading to variations in control results that affect gear shifting accuracy.
Innovation Solution
An automatic transmission system is designed with hydraulic friction engaging mechanisms, control valves, oil pressure detection units, learning units, and determination units to detect and correct oil pressure differences, ensuring the engaging time aligns with a target time by excluding control results from the learning process when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a learning function is used to eliminate individual differences in hydraulic friction engaging mechanisms, then control accuracy is improved, but learning errors occur when control results are influenced by factors other than assumed variation factors
Solution Approach 1:
The system implements feedback by detecting actual oil pressure with an oil pressure detection unit and comparing it with instructed oil pressure. The determination unit uses this feedback to identify abnormal control results, and the learning unit adjusts learning targets based on this information, preventing learning errors while maintaining control accuracy through continuous monitoring and adjustment
Solution Approach 2:
The determination unit acts as an intermediary between the oil pressure detection unit and the learning unit. It filters abnormal control results before they reach the learning unit, ensuring that only valid data is used for learning. This intermediary function protects the learning accuracy while preserving the benefits of the learning system
2Device complexity
If control results are used as learning targets without verification, then learning process is simplified, but learning errors occur due to abnormal control results from unassumed factors
Solution Approach 1:
The system performs preliminary verification by comparing instructed oil pressure with actual detected oil pressure before feeding control results to the learning unit. This preliminary action identifies and excludes abnormal control results in advance, preventing learning errors without significantly complicating the learning process
Solution Approach 2:
The determination unit selectively processes only abnormal control results for exclusion, rather than verifying all control results. This partial verification approach maintains learning accuracy while avoiding excessive complexity in the learning process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces learning errors by accurately adjusting oil pressures and maintaining the engaging time within a target range, enhancing gear shifting precision and ride comfort.
Implementation Method 1
an oil pressure detection unit configured to detect the oil pressure of the hydraulic oil supplied by the control valve
Implementation Method 2
a plurality of hydraulic friction engaging mechanisms configured to switch a transmission path of a driving force and establish a plurality of gears
Data Source
AI summary
An automatic transmission includes hydraulic friction engaging mechanisms for establishing a plurality of gears, at least one control valve for controlling oil pressures of hydraulic oils supplied to the engaging mechanisms, an oil pressure detection unit for detecting the oil pressure of the hydraulic oil supplied by the control valve, a learning unit for learning a correction value of an instructed oil pressure to the control valve such that an engaging time becomes a target engaging time, and a determination unit which determines, based on a difference between the instructed oil pressure to the valve and an oil pressure detection result obtained by the detection unit from the hydraulic oil supplied by the valve in correspondence with the instructed oil pressure, whether to exclude a control result by the instructed oil pressure from a learning target of the learning unit.