Fuel Injector Phase Correction for Multiple Injection Control
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Solution Overview
Problem
In multiple injection modes of internal combustion engines, the accuracy of fuel quantity control is compromised due to pressure pulsations in injectors, leading to variations in the interval period between fuel injections, which are not accurately accounted for by existing correction methods.
Innovation Solution
A system that calculates and corrects the phase difference between reference and actual fuel spray characteristics to ensure precise fuel quantity control by shifting the reference characteristic to match the actual behavior, thereby improving accuracy throughout the target interval period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If multiple injection mode is used to reduce combustion noise and emissions, then engine emissions and noise are improved, but pressure pulsations occur in the injector causing fuel quantity control accuracy to deteriorate
Solution Approach 1:
The system measures the actual interval period between fuel injections and compares it with the target interval period to calculate a phase difference. This feedback mechanism allows the control apparatus to correct the reference I-Q characteristic data, thereby compensating for pressure pulsation effects and maintaining accurate fuel quantity control despite the multiple injection mode's inherent pressure variations.
Solution Approach 2:
The system changes the parameter of reference I-Q characteristic data by applying phase correction based on the measured phase difference. This parameter adjustment allows the system to adapt to actual injector behavior under pressure pulsation conditions, resolving the contradiction between multiple injection benefits and fuel control precision.
2Manufacturing precision
If reference I-Q characteristic data is used to correct fuel spray characteristics, then fuel quantity control is improved, but extensive learning is required to correct the data accurately
Solution Approach 1:
The system performs preliminary measurement of the actual interval period and calculation of phase difference during normal operation. By continuously updating the phase correction based on these preliminary measurements, the system avoids the need for extensive initial learning while maintaining high accuracy in fuel spray characteristic correction.
Solution Approach 2:
The system uses its own operational data (actual interval period measurements) to automatically correct its reference characteristics. This self-service approach eliminates the need for external learning processes or extensive calibration procedures, achieving accurate fuel spray control through the system's inherent operational feedback.
3Stability of the object's composition
If interval period is extended to allow pressure pulsations to settle, then fuel spray stability is improved, but engine operating flexibility deteriorates
Solution Approach 1:
The system dynamically adjusts the reference I-Q characteristic data based on real-time measurement of actual interval periods. This dynamic correction allows the system to maintain fuel spray stability across varying interval periods without requiring a fixed extended interval, thereby preserving engine operating flexibility while ensuring spray consistency through adaptive phase correction.
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
This approach enhances the accuracy of fuel quantity control in multiple injection modes by accounting for variations in actual interval periods, reducing the impact of pressure pulsations and fabrication/aging-related deviations, leading to more precise fuel injection.
Implementation Method 1
The injector is normally designed to move a valve to open a port to thereby spray a quantity of fuel into a corresponding cylinder
Implementation Method 2
water hammer occurs in the injector at the moment when the valve closes the port of the injector to stop the shot of fuel in each stage injection, resulting in pressure pulsations in the injector
Data Source
AI summary
In an apparatus, an actual fuel spray characteristic obtaining unit obtains, based on an operation of a learning fuel injection instructing unit in a learning mode, an actual fuel spray characteristic of an injector relative to a variable of a target interval period within at least one section in a usable range therefor. A phase difference calculating unit calculates a phase difference between a reference fuel spray characteristic and the obtained actual fuel spray characteristic. A phase correcting unit shifts the reference fuel spray characteristic by the calculated phase difference such that the reference fuel spray characteristic is corrected to approach the obtained actual fuel spray characteristic.