Fuel Injector Initialization via Engine Speed Fluctuation Analysis
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Solution Overview
Problem
Conventional methods for initializing fuel injectors in engines are prone to errors due to incorrect input of correction data, leading to non-uniform fuel injection quantities among cylinders.
Innovation Solution
A method and apparatus that utilize temporarily input correction data to determine and match the injection characteristics of each injector, with the ability to interchange data between injectors to ensure equalized fuel injection quantities, using an ECU to obtain and compare engine-speed fluctuations and adjust correction data as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operator manually inputs correction data for each injector, then initialization can be performed, but incorrect input may occur leading to non-uniform fuel injection quantities
Solution Approach 1:
The system automatically detects injector characteristics and computes correction values without requiring manual operator input. The ECU performs self-diagnosis by measuring engine speed fluctuations during sequential injector activation, eliminating human error in data entry while maintaining ease of initialization.
Solution Approach 2:
The system measures actual engine speed fluctuations caused by each injector activation and uses this feedback to automatically compute and store correction values. The feedback loop compares expected versus actual injection characteristics, allowing the system to self-correct and ensure uniform fuel injection across all cylinders.
2Force
If correction data is stored in storage medium beforehand, then initialization can be performed, but wrong correction data may be stored causing injection quantity non-uniformity
Solution Approach 1:
The patent replaces manual data entry and storage processes with an automated electronic detection and computation system. The ECU electronically measures injector characteristics through engine speed fluctuation analysis and automatically computes correction values, eliminating the need for manual data storage and preventing erroneous data entry.
Solution Approach 2:
The system performs preliminary detection and computation of correction values during the initialization phase before actual fuel injection operations begin. By pre-establishing accurate correction values through automated measurement, the system ensures uniform injection quantities from the start of operation.
3Productivity
If fuel-injection parameters are computed based on wrong correction data, then computation can be performed, but non-uniform fuel quantity distribution occurs
Solution Approach 1:
The system measures actual engine speed fluctuations during injector testing and uses this feedback to compute accurate correction values. The feedback mechanism ensures that correction data reflects real injector characteristics, preventing computation based on erroneous data and ensuring uniform fuel distribution.
Solution Approach 2:
The system uses engine speed fluctuation measurements as an intermediary parameter to indirectly assess injector performance. By measuring the effect of each injector on engine speed rather than directly measuring injection quantity, the system obtains accurate correction data for computing uniform fuel injection parameters.
Data Source
AI summary
In an apparatus for initializing injectors based on pieces of correction data each corresponding to one of the injectors, an obtaining unit obtains injection characteristics of the injectors using temporally-input pieces of data as the pieces of correction data. The temporarily-input pieces of data correspond to the individual injectors. The injection characteristic of each injector depends on the injection quantity thereof. A matching unit executes determination of whether the obtained injection characteristics are substantially matched with each other. The matching unit also executes interchange of at least two of the temporarily-input pieces of data with each other, thereby obtaining injection characteristics of the injectors based on the temporally-input pieces of data whose at least two pieces of data are interchanged with each other.