Fuel Injector Diagnostics via Static Flow Rate and Speed Fluctuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods cannot accurately diagnose errors in individual fuel injectors of internal combustion engines, leading to potential deviations in static flow rates and running smoothness, which can affect emissions and engine performance, and often require global corrections rather than targeted troubleshooting.
Innovation Solution
A method that assesses a representative value of static flow rate and rotational speed fluctuation for each fuel injector, allowing for error detection and assignment to specific injectors or other components/operating phases, with threshold-based deviation analysis to differentiate and address issues effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If global corrections are applied to all fuel injectors based on lambda control, then emission compliance is improved, but the ability to detect and correct individual injector deviations is lost
Solution Approach 1:
The patent divides the global correction approach into individual injector-level diagnostics. By calculating a first representative value for each specific fuel injector's static flow rate and comparing it against reference values, the system can identify deviations at the individual component level rather than applying blanket corrections to all injectors. This segmentation enables precise localization of problematic injectors while maintaining overall emission compliance.
Solution Approach 2:
The invention implements local quality control by assessing each fuel injector's static flow rate characteristics individually. The control unit calculates representative values for each injector and compares them against reference values, enabling targeted corrections for specific injectors with deviations. This local approach allows precise troubleshooting and correction of individual injector issues without affecting the performance of other healthy injectors.
2Measurement precision
If representative values for static flow rate are calculated for each fuel injector, then diagnostic precision is improved, but the complexity of the control system increases
Solution Approach 1:
The control unit utilizes existing sensor data and its own processing capabilities to calculate representative values for each fuel injector's static flow rate. The system self-diagnoses by comparing calculated values against stored reference values, eliminating the need for external diagnostic equipment or complex additional hardware. This self-service approach maintains diagnostic precision while minimizing system complexity.
Solution Approach 2:
The control unit performs multiple functions: it manages fuel injection timing, calculates static flow rate representative values, compares them against reference values, and identifies deviations. By consolidating these diagnostic and control functions within the existing control unit rather than adding separate dedicated systems, the patent achieves high diagnostic precision without proportionally increasing system complexity.
3Stability of the object's composition
If individual injector deviations are detected and corrected, then running smoothness is improved, but the time and resources required for diagnostics increase
Solution Approach 1:
The system continuously monitors and calculates representative values for each fuel injector's static flow rate during normal operation. By performing diagnostics continuously rather than requiring separate diagnostic sessions, the system maintains running smoothness through real-time detection and correction while minimizing the time lost to diagnostics. The diagnostic process becomes an integrated part of normal engine operation.
Data Source
AI summary
A method is described for diagnosing errors in an internal combustion engine in which fuel is injected from a high-pressure accumulator into associated combustion chambers with the aid of multiple fuel injectors, a first value (Rstat,2) which is representative of a static flow rate of fuel through one of the fuel injectors being ascertained, a second value (Δn) which is representative of a running smoothness of the internal combustion engine being ascertained, if at least one of the two values (Rstat,2, Δn) deviates from the particular associated reference value (R′stat, Δn0), an error (F) being deduced, and the error (F) being assigned to the fuel injector and/or at least one further component and/or at least one operating phase of the internal combustion engine on the basis of deviations of the two representative values (Rstat,2, Δn) from the particular associated reference value (R′stat, Δn0).