Fuel Injection Controller Variation Correction
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Solution Overview
Problem
Existing fuel injection systems struggle to achieve accurate injection characteristics inside an engine cylinder due to variations in injector data measured outside the cylinder, leading to excessive corrections and deviations from designed median values caused by in-cylinder pressure.
Innovation Solution
Incorporating in-cylinder pressure into injector individual data measured outside the cylinder for variation correction, allowing the fuel injection device to adjust injection parameters such as injection start delay, end delay, and rate to align with designed median values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If variation correction is performed using injector individual data measured outside the cylinder, then injection characteristics can be corrected to designed median values, but in-cylinder pressure causes excessive correction and deviation from designed values
Solution Approach 1:
The patent applies parameter changes by incorporating in-cylinder pressure data into the correction process. The correction value is adjusted based on the relationship between in-cylinder pressure and injection characteristics, transforming the correction approach from using only outside-cylinder measurement data to using a combination of outside-cylinder measurement data and in-cylinder pressure conditions. This resolves the contradiction by adapting the correction parameters to match actual in-cylinder operating conditions.
2Productivity
If highly accurate injection control is required for multi-injection, then engine performance and exhaust purification improve, but injection variation correction becomes difficult when injectors are mounted in the engine
Solution Approach 1:
The patent implements feedback by using in-cylinder pressure as a reference parameter to adjust the variation correction values. The system continuously monitors in-cylinder pressure conditions and uses this information to modify the correction applied to injection timing and duration. This feedback mechanism ensures that the injection control remains accurate under varying in-cylinder pressure conditions, enabling both high engine performance and precise injection control.
Solution Approach 2:
The patent changes the correction parameters dynamically based on in-cylinder pressure conditions. Instead of using fixed correction values derived from outside-cylinder measurements, the system adjusts correction parameters according to actual in-cylinder pressure, enabling accurate injection control that adapts to different operating conditions and achieves both high productivity and manufacturing precision.
3Reliability
If in-cylinder pressure is incorporated into variation correction, then accurate injection characteristics inside the cylinder are achieved, but correction complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the relationship between in-cylinder pressure and injection characteristics through outside-cylinder measurements. The correction methodology and parameter relationships are determined in advance during injector testing, allowing the control system to simply apply pre-calculated correction values based on measured in-cylinder pressure without requiring complex real-time calculations or additional hardware.
Data Source
AI summary
A fuel injection device calculates a variation correction value by incorporating in-cylinder pressure into injector individual data based on an injection rate of an injector measured outside a cylinder of an engine. The fuel injection device corrects a target injection amount and generation timing of a command signal of the injector based on the variation correction value. Thus, accurate injection characteristics substantially conforming to designed median values can be obtained inside the cylinder, and highly accurate injection control can be performed. Thus, the fuel injection device can perform accurate multi-injection, which requires extremely high accuracy, to simultaneously achieve reduction of engine vibration and engine noise, purification of exhaust gas and improvement of engine output and fuel consumption at high levels.