Electro-hydraulic Control System Diagnostics via Pressure Adjustment
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Solution Overview
Problem
Diagnostic techniques for electro-hydraulic control systems in transmissions are time-consuming and costly due to the difficulty in identifying faulty components, requiring substantial trial and error.
Innovation Solution
A method involving the adjustment of regulator control signals to detect faults in the electro-hydraulic control system by monitoring status signals from a pressure switch, including increasing and decreasing main line pressures to determine system functionality and detect issues such as fluid leakage or pressure switch failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional trial and error diagnostic techniques are used for electro-hydraulic control systems, then diagnostic completeness may be achieved, but diagnostic time and cost increase substantially
Solution Approach 1:
The system performs preliminary diagnostic actions by automatically monitoring pressure switch status signals against expected pressure conditions during predefined diagnostic pressure levels. This preliminary detection identifies potential faults before they manifest as transmission performance issues, eliminating the need for time-consuming trial and error diagnostics while maintaining comprehensive diagnostic coverage.
Solution Approach 2:
The diagnostic system continuously monitors pressure switch status signals and compares them against expected states based on current regulator control signals and predefined diagnostic pressure levels. This feedback mechanism automatically identifies deviations indicating faults, providing real-time diagnostic information without requiring manual intervention or extended diagnostic procedures.
2Reliability
If traditional trial and error diagnostic techniques are used for electro-hydraulic control systems, then diagnostic completeness may be achieved, but diagnostic cost increases substantially
Solution Approach 1:
The electro-hydraulic control system performs self-diagnostics by automatically monitoring its own pressure switch status signals and comparing them against expected conditions. The electronic control module independently evaluates diagnostic data and identifies faults without requiring external diagnostic equipment or specialist intervention, thereby reducing diagnostic costs while maintaining comprehensive fault detection capability.
Solution Approach 2:
The system implements continuous feedback monitoring of pressure switch status signals against predefined diagnostic pressure levels and expected states. This automatic feedback mechanism provides comprehensive diagnostic information in real-time, eliminating the need for costly manual diagnostic procedures and external diagnostic tools while ensuring complete fault detection.
3Measurement precision
If regulator control signals are adjusted to multiple pressure levels for diagnostics, then fault detection accuracy improves, but system complexity increases
Solution Approach 1:
The diagnostic system dynamically adjusts regulator control signals to different pressure levels based on the diagnostic phase and fault type being investigated. The electronic control module automatically transitions between predefined diagnostic pressure levels, and the pressure switch status signals are continuously monitored against the current expected state. This dynamic approach achieves high fault detection accuracy while the automated control logic prevents diagnostic procedure complexity from increasing.
Data Source
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.