Dual Fuel Injector Error Differentiation
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Solution Overview
Problem
Existing systems fail to accurately distinguish between fueling errors in dual fueling engine systems with direct and port fuel injectors, often misidentifying errors as common errors, leading to incorrect adjustments and potential disabling of non-degraded injectors.
Innovation Solution
A method that differentiates errors by calculating the rate of change of air-fuel ratio error relative to the fraction of fuel injected via direct and port fuel injectors, using adapted fuel multipliers to determine individual injector errors and common errors, allowing for distinct compensations and reducing erroneous disabling of fuel injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If port and direct fuel injector errors are determined by calculating a ratio of change in fuel multiplier values and change in fraction of fuel injected, then fuel injector errors can be identified, but individual fueling errors of direct and port fuel injectors cannot be distinguished from common errors
Solution Approach 1:
The patent segments the error analysis into three distinct components: direct injector error, port injector error, and common error. By calculating separate fueling slope errors for direct and port injection systems and comparing their differences, the method distinguishes individual injector errors from common fuel system errors, preventing misdiagnosis and inappropriate corrective actions.
2Reliability
If transfer function adjustment is made based on injector error, then air-fuel error can be corrected, but the error persists when the error is due to common fuel system errors
Solution Approach 1:
The patent segments the error correction process into distinct paths: when individual injector error is detected, transfer function adjustment is applied to that specific injector; when common error is detected, the system identifies this separately and applies appropriate common error correction, preventing ineffective individual injector adjustments from being applied to common problems.
Solution Approach 2:
The patent implements a feedback mechanism where the calculated fueling slope errors and their differences are continuously monitored. Based on this feedback, the system determines whether to apply transfer function adjustments or identify common errors, creating a closed-loop control system that adapts corrective actions based on the actual error source.
3Reliability
If fuel injector is disabled due to detected error, then engine performance can be protected, but non-degraded injectors may be erroneously disabled
Solution Approach 1:
The patent segments the error diagnosis to distinguish between individual injector failures and common system failures. By calculating the difference in fueling slope errors between direct and port injection systems, the method accurately identifies which specific injector (if any) is degraded, preventing erroneous disabling of healthy injectors while still protecting engine performance through targeted corrections or selective disabling.
Data Source
AI summary
Systems and methods for determining air-fuel error in an engine fueled via direct and port fuel injection. Errors associated with individual fuel injection systems are distinguished from a common error based on trends in the error correction coefficients of the individual fuel injection systems. Adaptive fuel multipliers for each injection system are updated to account for the common error.