Digital Valve Leak Rate Control for Engine Testing
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Solution Overview
Problem
Current engine leak testing methods are inefficient and labor-intensive, requiring numerous manual adjustments and trials to determine the optimal leak rate, making them unsuitable for rapid adaptation to new engine designs and manufacturing efficiency.
Innovation Solution
A method involving a leak tester development system that uses a digital valve to control the leak rate of pressurized air from an engine, allowing for sequential testing programs to determine the best-suited program for assembly line use, which automates the process of measuring pressure drops to establish leak rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment of leak rate is used, then testing can be performed, but the development time and labor required increase significantly
Solution Approach 1:
The patent replaces manual mechanical adjustment of orifices with an automated digital valve system controlled by a microprocessor. The digital valve electronically adjusts the leak rate based on programmed parameters, eliminating the need for manual intervention and significantly reducing development time while maintaining testing capability
Solution Approach 2:
The system performs self-testing and self-adjustment through automated trial runs. The microprocessor automatically sequences multiple trials at different leak rates, collects pressure decay data, and determines the optimal leak rate without requiring operator intervention for each trial, enabling the system to develop its own testing program
2Measurement precision
If multiple trials are run to determine optimal leak rate, then accurate leak detection is achieved, but the number of iterations required becomes unmanageable
Solution Approach 1:
The system employs periodic trial runs with systematically varying leak rates. The microprocessor automatically sequences multiple trials at different predetermined leak rates, measures pressure decay during each trial, and uses the collected data to identify the optimal leak rate, achieving both accuracy and efficiency through structured periodic testing
Solution Approach 2:
The system incorporates feedback mechanisms where pressure decay measurements from each trial are fed back to the microprocessor. The microprocessor analyzes this feedback data to determine which leak rates provide the best measurement signals, then adjusts subsequent trials accordingly to rapidly converge on the optimal leak rate for the specific engine being tested
3Measurement precision
If wait time between trials is extended to allow pressure dissipation, then measurement accuracy is maintained, but total testing time increases
Solution Approach 1:
The system performs preliminary actions by actively venting the engine between trials using the digital valve before the next trial begins. This preliminary venting action ensures that pressure is dissipated and the engine is ready for the next trial without requiring extended passive wait times, maintaining measurement accuracy while reducing total testing time
4Measurement precision
If testing program is specific to individual engine types, then accurate leak detection is achieved, but adaptability to new engine designs requires complete program redevelopment
Solution Approach 1:
The system transitions from static, hard-coded testing programs to dynamic, adaptive programming. The microprocessor automatically adjusts testing parameters including leak rates, trial sequences, and measurement intervals based on real-time pressure decay characteristics of the specific engine being tested, enabling accurate leak detection across different engine types without complete program redevelopment
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 method significantly reduces the time and labor required to develop testing programs, enabling efficient selection of the optimal testing program for engine leak detection, thereby improving manufacturing efficiency and adaptability to new engine designs.
Implementation Method 1
the supply of pressurized air to the engine is discontinued and a digital valve is opened to allow pressurized air to leak from the engine at a predetermined controlled rate
Implementation Method 2
while the engine pressure is measured for a predetermined period of time. The measured pressure drop is used to establish the rate at which the engine leaks
Data Source
AI summary
A method and apparatus for developing a test for determining if an engine has oil seal leaks. The engine is charged with a predetermined pressure of air and monitored by a leak tester. A digital valve is set to provide a certain leak rate based upon signals received from a digital valve controller. Thereafter, based upon signals received from a PC and a main control unit, a variety of trials are completed. The results and programs are stored in the PC. Results of the trials allow an optimized testing program to be selected that would be best suited for use on a manufacturing assembly line.