Fuel Injector Control via Pressure Transient Analysis
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Solution Overview
Problem
High pressure fuel injectors experience delay periods and variations in injector response, affecting fuel injection accuracy and engine performance, making direct feedback measurement difficult with commercially available hardware.
Innovation Solution
A method and system for diagnosing and adjusting fuel injector control using a controller with modules that model fuel injection parameters, such as rate shape characteristics, to estimate and adjust fuel quantity delivered based on operating conditions, incorporating a fuel amount virtual sensor for real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct feedback measurement hardware is used to measure injector opening and closing events, then measurement precision can be improved, but device complexity and cost increase beyond commercially reasonable levels
Solution Approach 1:
The patent introduces a pressure sensor as an intermediary device that indirectly measures injector opening and closing events by detecting pressure changes in the fuel system. This mediator approach allows measurement of injector events without requiring direct feedback hardware on the injector itself, thus maintaining measurement precision while avoiding excessive device complexity and cost
Solution Approach 2:
The patent replaces direct mechanical/electrical feedback measurement systems with a pressure-based measurement approach. By using pressure sensors to detect injector events through pressure transients in the fuel system, the invention substitutes complex direct measurement hardware with simpler pressure sensing technology that achieves the same measurement objectives
2Manufacturing precision
If injector response variations are not compensated, then device complexity remains low, but fuel injection accuracy and engine performance deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where pressure sensor measurements of actual injector opening and closing events are used to update and refine the injector model parameters. This feedback loop allows the system to compensate for injector response variations and improve fuel injection accuracy by continuously adapting the model to match actual injector behavior under different operating conditions
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting injector model parameters (such as opening delay, closing delay, and injection duration) based on measured pressure data and operating conditions. This allows the system to compensate for injector variations without requiring complex hardware modifications, simply by adapting the control parameters
3Manufacturing precision
If injector model parameters are updated in real-time, then fuel injection accuracy improves, but processing time and computational load increase
Solution Approach 1:
The patent applies partial action by updating only the necessary injector model parameters (opening delay, closing delay, injection duration) based on specific measured events rather than continuously recalculating all possible parameters. This selective parameter update approach maintains fuel injection accuracy while reducing computational load and processing time
Data Source
AI summary
A method includes determining a stored injection relationship that includes a number of fuel performance parameters. In one form the fuel performance parameters are related to a particular shape, and may be related to a particular operating condition. The method includes determining a fuel performance outcome during a fuel injection event, and updating the stored injection relationship in response to the fuel performance outcome. The fuel performance outcome can be an injected fuel quantity.