Stuck Fuel Injector Detection via Transition Waveform Deviation
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Solution Overview
Problem
Conventional control systems for internal combustion engines face challenges in detecting stuck fuel injectors efficiently, which can lead to increased emissions and reduced combustion efficiency, as they often rely on misfire diagnostic systems that impose constraints on fuel injection pulse duration.
Innovation Solution
A control system and method that includes a transition period waveform monitor module and a stuck fuel injector detection module to measure and analyze the electrical signal of a fuel injector upon deactivation, detecting a stuck injector when the accumulated deviation from a parameterized estimated reference waveform exceeds a predetermined range, allowing for adaptive fuel injection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If misfire diagnostic systems are used to detect stuck fuel injectors, then detection capability is provided, but fuel injection pulse duration is constrained and combustion efficiency is reduced
Solution Approach 1:
The system performs preliminary detection of stuck fuel injectors by monitoring the electrical signal during the transition period immediately after injector deactivation. By detecting abnormalities in this early phase before combustion occurs, the system can identify stuck injectors without needing to constrain fuel injection pulse duration, thereby maintaining combustion efficiency while providing reliable detection capability.
2Reliability
If conventional misfire diagnostic systems are used, then stuck fuel injector detection is achieved, but oxygen sensor feedback is required which increases system complexity and response time
Solution Approach 1:
The invention extracts the detection function from the conventional misfire diagnostic system that relies on oxygen sensor feedback. By isolating and monitoring only the electrical signal during the transition period after injector deactivation, the system achieves stuck fuel injector detection accuracy without requiring oxygen sensors or complex feedback loops, thereby reducing system complexity and improving response time.
3Measurement precision
If fuel injection pulse duration is constrained by misfire diagnostic systems, then detection sensitivity is improved, but emissions increase and combustion efficiency decreases
Solution Approach 1:
The system implements feedback by continuously monitoring the electrical signal characteristics during the transition period after injector deactivation. This real-time feedback allows for accurate detection of stuck injectors through analysis of signal deviation from expected patterns, enabling the system to maintain normal fuel injection pulse durations while achieving high detection sensitivity, thereby preventing increased emissions and maintaining combustion efficiency.
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
Enables accurate detection and control of stuck fuel injectors without oxygen sensor feedback, improving combustion efficiency and reducing emissions by allowing for precise adjustment of fuel injection parameters, applicable to both ballistic and non-ballistic fuel injectors.
Implementation Method 1
measuring an electrical signal of the fuel injector upon deactivation of the fuel injector
Data Source
AI summary
A control system for an engine is presented. The control system can include a transition period waveform monitor module, a stuck fuel injector detection module, and a fuel injection control module. The transition period waveform monitor module measures an electrical signal of a fuel injector upon deactivation of the fuel injector. The stuck fuel injector detection module detects a stuck fuel injector when an accumulated deviation of the electrical signal from a parameterized estimated reference waveform is outside of a predetermined range. The fuel injection control module controls fuel injection in the engine based on the detection of the stuck fuel injector.