Continuous Injection Detection via Pressure Drop Analysis
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Solution Overview
Problem
Existing methods for detecting continuous injection in internal combustion engines, such as those involving passive pressure-limiting valves, are costly and complex, and fail to detect continuous injection events independently of quantity-limiting valves, leading to potential engine malfunctions and damage.
Innovation Solution
A method that monitors high-pressure changes over time in the injection system, using a high-pressure accumulator and deactivation valves to detect continuous injection by checking for a predetermined pressure drop within a specific time interval without relying on quantity-limiting valves, ensuring accurate detection by excluding other pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantity-limiting valves are installed to detect continuous injection, then detection reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the detection function from the quantity-limiting valve and implements it independently using a pressure sensor and control unit. The pressure sensor monitors rail pressure independently, and the control unit analyzes pressure changes over time to detect continuous injection, separating the detection function from the fuel limiting function.
Solution Approach 2:
The pressure sensor and control unit serve multiple functions: they monitor rail pressure for injection control and simultaneously detect continuous injection events by analyzing pressure drop patterns. This multi-functionality eliminates the need for separate quantity-limiting valves dedicated solely to detection.
2Reliability
If quantity-limiting valves are used for continuous injection detection, then detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The system uses its own existing pressure sensor and control unit to perform continuous injection detection, rather than requiring separate dedicated components. The existing pressure monitoring infrastructure serves dual purposes: injection control and anomaly detection, making the system self-sufficient for detection without additional hardware costs.
Solution Approach 2:
The control unit analyzes pressure data for multiple purposes including injection timing control and continuous injection detection. By making the control unit universal, the patent avoids the need for separate detection devices, thereby reducing manufacturing costs while maintaining detection capability.
3Device complexity
If high pressure monitoring with time-based analysis is used to detect continuous injection, then device complexity is reduced, but measurement precision requirements increase
Solution Approach 1:
The control unit stores pressure values over time in a buffer memory before analysis. By preliminarily collecting and storing pressure data points, the system can perform retrospective analysis of pressure drops, allowing detection based on time-based patterns rather than requiring extremely precise real-time threshold detection.
Solution Approach 2:
The control unit continuously monitors pressure drops and compares them against stored historical pressure data. This feedback mechanism allows the system to distinguish between normal pressure fluctuations and continuous injection events by analyzing pressure trends over time, reducing the need for ultra-precise single-point pressure measurements.
Data Source
AI summary
A method for detecting continuous injection during the operation of an internal combustion engine with an injection system having a high-pressure accumulator for a fuel, wherein—a high pressure in the injection system is monitored as a function of time, wherein—in order to detect continuous injection it is checked whether the high pressure has dropped by a predetermined continuous injection differential pressure value within a predetermined continuous injection time interval, wherein—it is checked whether a reduction valve which connects the high-pressure accumulator to a fuel reservoir has been triggered, and wherein—continuous injection is detected if—a reduction valve has not been triggered in a predetermined checking time interval before the dropping of the high pressure, and if—the high pressure has dropped by the predetermined continuous injection differential value amount within the predetermined continuous injection time interval.