Fuel Rail Pressure Detection During Engine Ramp-Up
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Solution Overview
Problem
Current fuel leak detection methods in internal combustion engines fail to adequately detect moderate or small leaks and may falsely diagnose leaks, especially in systems that recirculate leaked fuel, leading to engine de-rating and premature pump failure due to cavitation damage.
Innovation Solution
A fuel leak detection system that includes a sensor to measure rail pressure during engine ramp-up and a controller to determine if a fuel leak exists by comparing the measured rail pressure to a desired pressure threshold, outputting an indication of the leak when the difference exceeds a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current leak detection methods are used, then relatively large leaks can be detected, but moderate or small leaks cannot be adequately detected and false diagnoses occur
Solution Approach 1:
The system performs leak detection during engine ramp-up before normal operation begins. By detecting leaks during this preliminary phase when the fuel system is pressurizing, the system can identify moderate and small leaks that would be missed during steady-state operation, thereby improving detection precision without compromising reliability
Solution Approach 2:
The system continuously monitors rail pressure during ramp-up and compares it against expected pressure values. This feedback mechanism allows the system to detect pressure deviations indicating leaks and provide corrective action before the engine reaches operating conditions where leaks would cause damage, resolving the contradiction between detection precision and reliability
2Productivity
If the pump pumps more fuel to compensate for leaks, then the engine demand is met, but the pump life decreases due to cavitation damage
Solution Approach 1:
The system detects fuel leaks during engine ramp-up before the pump needs to compensate for extended periods. By identifying leaks early in the ramp-up phase, the system can alert the operator or initiate corrective actions before the pump undergoes prolonged cavitation damage, thereby preserving pump life while ensuring engine demand can be met
Solution Approach 2:
The system prevents cavitation damage by detecting leaks before they cause significant pump wear. The early detection during ramp-up allows for preliminary anti-action through operator alert or system shutdown, preventing the pump from operating under cavitation conditions that would reduce its lifespan
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
Accurately detects fuel leaks, including moderate or small ones, during engine ramp-up, reducing false negatives and positives, and enabling proactive maintenance to prevent engine de-rating and pump failure.
Implementation Method 1
measuring rail pressure of a fuel rail during the ramp up
Data Source
AI summary
Fuel leak detection systems and methods are disclosed. A method for detecting a fuel leak for a fuel system of an engine includes detecting a ramp up of the engine. The method includes measuring rail pressure of a fuel rail during the ramp up. The method also includes determining a fuel leak exists in the fuel system based on the measured rail pressure during the ramp up. In accordance with a determination that a fuel leak exists, the method includes outputting an indication of the fuel leak in the fuel system.