Transmission Hydraulic Pressure Calibration for Fault Detection
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Solution Overview
Problem
Diagnosing faults in electro-hydraulic control systems for transmissions is challenging due to the interdependence of components, leading to time-consuming and costly trial-and-error methods.
Innovation Solution
An electro-hydraulic control system with a control main valve and clutch trim valve, along with an electronic control module, that adjusts main line pressure and detects faults based on status signals from a pressure switch, allowing for the detection of fluid supply issues and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional trial-and-error diagnostic methods are used to identify faulty components in electro-hydraulic control systems, then diagnostic accuracy can be achieved, but diagnostic time and cost increase substantially
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the system to establish baseline relationships between regulator control signals and main line pressure levels. This calibration data is stored and later used to rapidly compare against actual operating conditions, enabling quick fault identification without trial-and-error diagnostics. The calibration process performs preliminary measurements and stores reference values that accelerate subsequent diagnostic operations.
2Reliability
If multiple components are monitored to improve fault detection capability, then diagnostic accuracy improves, but system complexity increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the relationship between regulator control signals and main line pressure levels, comparing actual measurements against calibrated baseline values. The system provides feedback through diagnostic flags that indicate when deviations exceed predetermined thresholds, suggesting component faults. This feedback mechanism enables reliable fault detection while maintaining relatively simple system architecture by focusing monitoring efforts on critical parameter relationships rather than all possible component states.
Data Source
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AI summary
Various embodiments of methods, apparatus and systems that diagnose and/or detect faults of an electro-hydraulic control system for a transmission are presented. Some embodiments, adjust a main line pressure of the electro-hydraulic control system and detect faults based upon changes in a pressure switch resulting from such adjustments of the main line pressure. The pressure switch may be incorporated into a control main valve or a clutch trim valve of the electro-hydraulic control system.