High Pressure Fuel Pump Leakage Detection via Rail Pressure Monitoring
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Solution Overview
Problem
Existing technologies fail to effectively detect fuel leakage tendencies in high-pressure fuel pumps of vehicles, which is crucial for maintaining engine performance and efficiency, especially in gasoline direct injection engines.
Innovation Solution
A method and device that utilize a controller to monitor the fuel rail pressure and pressure reach time, triggering a message for the user to inspect the high-pressure fuel pump when certain conditions are met, indicating potential leakage by tracking engine restarts due to low fuel rail pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing detection technologies are used, then the system structure remains simple, but fuel leakage detection capability is insufficient
Solution Approach 1:
The patent introduces a controller as an intermediary component that mediates between the fuel rail pressure sensor and the user interface. The controller processes pressure data, determines leakage conditions based on reference comparisons, and triggers appropriate responses. This intermediary approach enables sophisticated leakage detection without requiring complex additional hardware, as the controller utilizes existing sensor data through intelligent processing algorithms.
2Reliability
If continuous monitoring of fuel rail pressure is implemented, then fuel leakage can be detected early, but energy consumption increases
Solution Approach 1:
The system implements periodic monitoring of fuel rail pressure rather than continuous monitoring. The controller checks pressure at specific intervals (e.g., during engine operation cycles or at predetermined time points) to determine if leakage conditions exist. This periodic approach maintains reliable detection capability by sampling pressure at critical moments while significantly reducing overall energy consumption compared to continuous monitoring schemes.
3Measurement precision
If reference pressure reach time is measured to detect leakage, then detection accuracy improves, but calculation time increases
Solution Approach 1:
The system performs preliminary actions by pre-establishing reference pressure values and reference time thresholds before actual leakage detection occurs. These reference parameters are determined in advance based on normal operating conditions and stored for quick comparison. When monitoring, the system only needs to measure current pressure, calculate time to reach reference pressure, and compare against pre-stored references, rather than performing complex real-time analysis. This approach maintains high detection accuracy while minimizing calculation time during operation.
Data Source
AI summary
A method for detecting leakage of a high pressure fuel pump of a vehicle includes: turning off starting of an engine; after the starting of the engine is turned off, determining whether restarting of the engine occurs by a fuel rail pressure condition in which internal fuel pressure of a fuel rail connected between the high pressure fuel pump and an injector of the engine is less than or equal to a reference pressure; when the restarting of the engine occurs by the fuel rail pressure condition, determining whether a reference pressure reach time of the internal fuel pressure of the fuel rail is less than or equal to a reference time; and when the reference pressure reach time of the internal fuel pressure of the fuel rail is less than or equal to the reference time, storing a number of times of restarting of the engine.