Transmission Electro-Hydraulic Pressure Switch Fault Calibration
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Solution Overview
Problem
Diagnostic techniques for electro-hydraulic control systems in vehicle transmissions are time-consuming and costly due to the complexity of identifying faulty components, as the operation of one component often depends on others, making it difficult to pinpoint issues without substantial trial and error.
Innovation Solution
A method and system that generate status signals based on the transition of a control main valve between regulating and non-regulating states in response to pressure level changes, allowing for the detection of faults through regulator control signals and pressure switch status signals, and calibrating regulator control signals to improve system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional diagnostic techniques are used to identify faulty components in electro-hydraulic control systems, then comprehensive component inspection can be performed, but diagnostic time and costs increase substantially
Solution Approach 1:
The system performs preliminary calibration during manufacturing or initial setup, establishing baseline relationships between regulator control signals and pressure switch status signals. This preliminary action stores reference data that enables rapid fault detection during operation without requiring time-consuming trial-and-error diagnostics
Solution Approach 2:
The system continuously monitors pressure switch status signals and compares them against stored calibration data to provide real-time feedback on system health. This feedback mechanism enables immediate fault identification by detecting deviations from expected behavior patterns, eliminating the need for extensive manual testing
2Reliability
If comprehensive component inspection is performed to identify faulty components, then reliable fault detection can be achieved, but diagnostic complexity and costs increase
Solution Approach 1:
The system extracts and stores only the critical calibration parameters and baseline relationships between key components (regulator control signals and pressure switch status) during initial setup. By focusing on these essential parameters rather than inspecting every component, the system achieves reliable fault detection while maintaining simplicity
Solution Approach 2:
The calibration data structure is designed to be universal, enabling a single set of calibration procedures to detect faults across multiple components and operating conditions. This multi-functional approach allows the same diagnostic system to identify various types of failures without requiring component-specific diagnostic routines
3Reliability
If trial and error methods are used to identify faulty components, then comprehensive testing can be performed, but diagnostic costs and time consumption increase
Solution Approach 1:
The system performs preliminary calibration during manufacturing or initial setup, establishing baseline relationships between regulator control signals and pressure switch status signals. This preliminary action stores reference data that enables rapid fault detection during operation without requiring time-consuming trial-and-error diagnostics
Solution Approach 2:
The system replaces manual trial-and-error diagnostic procedures with an automated electronic comparison system. The electronic control module automatically compares real-time pressure switch status signals against stored calibration data, substituting mechanical diagnostic processes with faster electronic analysis to improve diagnostic efficiency
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
Enables efficient fault detection and calibration of the electro-hydraulic control system, reducing diagnostic time and costs by providing clear status signals for fault identification and system optimization.
Implementation Method 1
A method and system that generate status signals based on the transition of a control main valve between regulating and non-regulating states in response to pressure level changes
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.