Fuel Injection Control Device Using Pressure Fluctuation Feedback
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Solution Overview
Problem
Conventional fuel injection control systems face challenges in accurately controlling fuel injection due to individual differences in engine components and aging effects, making it difficult to maintain optimal injection patterns over time.
Innovation Solution
A fuel injection control device with a fuel pressure sensing section, injection centroid detecting section, and injection varying section that adjusts injection commands based on detected fuel pressure fluctuations and geometric centroids to match actual and basic injection rate profiles, ensuring appropriate fuel injection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional map-based injection control is used, then initial injection accuracy is achieved, but individual component variations and aging effects cause deviation from optimum values over time
Solution Approach 1:
The system uses the engine's own fuel pressure fluctuations during injection as a self-diagnostic signal to detect actual injection characteristics. By monitoring the natural pressure variations in the fuel supply system, the ECU automatically identifies deviations from optimal injection patterns without requiring external testing equipment or manual adjustments.
Solution Approach 2:
The system establishes a feedback loop where the ECU continuously monitors fuel pressure fluctuations, compares actual injection characteristics against target values, and automatically adjusts injection commands to correct deviations. This closed-loop control ensures long-term maintenance of optimal injection patterns despite component aging and individual variations.
2Manufacturing precision
If adaptation values are obtained for all components through experiment, then individual differences are accounted for, but the work required becomes excessive for mass production
Solution Approach 1:
Instead of requiring pre-calibration of each component during manufacturing, the system enables each injection system to self-identify its characteristics through monitoring fuel pressure fluctuations during normal operation. This eliminates the need for time-consuming experimental determination of adaptation values for every component.
Solution Approach 2:
The system automatically detects and compensates for individual component variations through continuous feedback from fuel pressure sensors, eliminating the need for manual calibration during production while maintaining optimal injection patterns for each specific configuration.
3Reliability
If injection control is adjusted frequently, then optimal performance is maintained, but system complexity and control difficulty increase
Solution Approach 1:
The ECU continuously monitors fuel pressure fluctuations and automatically adjusts injection commands based on detected deviations, maintaining optimal performance through simple feedback control without requiring complex control algorithms or additional hardware.
Solution Approach 2:
The system uses readily available fuel pressure data from the fuel supply system to automatically detect injection characteristic changes and self-correct, avoiding the need for complex external monitoring systems or manual intervention.
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 solution enables precise and adaptive fuel injection control, improving engine output torque and emission characteristics by adjusting injection timings and pressures in real-time, effectively addressing component variations and aging effects.
Implementation Method 1
a fuel pressure sensor 20a is provided to a fuel inlet of the injector 20... sequentially senses fuel pressure fluctuating with the injection of the injector
Implementation Method 2
detects an injection centroid as a geometric centroid of a diagram as a profile of a transition of an injection rate
Data Source
AI summary
A fuel injection control device (ECU) for controlling injection supply of fuel to a target engine has a program for sequentially sensing fuel pressure fluctuating with injection of a predetermined injector a program for detecting an injection centroid of a diagram as a profile of a transition of an injection rate of the injector at a present time based on a transition of the sequentially sensed fuel pressure, and a program for varying an injection command (injection timing) of the injector based on the detected injection centroid and an injection centroid of a predetermined basic diagram such that a relative positional relationship between the injection centroids of the diagram as the actual profile of the injection rate transition and the basic diagram becomes a relationship, in which timings of the injection centroids are close to each other.