Dynamic Abnormality Determination for Fuel Injection Control
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Solution Overview
Problem
Current injection control devices for internal combustion engines face challenges in accurately controlling fuel injection due to variations in energization current gradient, leading to potential excessive fuel injection and air-fuel ratio deviations, as they rely on fixed abnormality determination values for current area correction.
Innovation Solution
An injection control device that includes a fuel injection quantity command value output unit, a fuel injection quantity correction unit, and a controller executing current control based on an energization current profile, with an area correction abnormality determination unit that adjusts the abnormality determination value based on air-fuel ratio feedback to prevent excessive correction and maintain optimal fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed abnormality determination value is used for current area correction, then the control logic is simple, but excessive fuel injection occurs and air-fuel ratio deviations increase
Solution Approach 1:
The abnormality determination value is changed from a fixed parameter to a dynamic parameter that varies based on injection duration. The control unit selects different abnormality determination values according to the measured injection duration, allowing the system to adapt to varying operating conditions and prevent both excessive and insufficient fuel injection across different engine loads and temperatures.
Solution Approach 2:
The system changes the parameter (abnormality determination value) based on another parameter (injection duration). By establishing a relationship between injection duration and the appropriate abnormality determination value, the system optimizes injection accuracy for different operating conditions without requiring complex real-time calculations.
2Manufacturing precision
If current area correction is executed to compensate for lower energization current gradient, then fuel injection accuracy improves, but excessive correction occurs leading to over-injection
Solution Approach 1:
The system uses feedback from the measured injection duration to adjust the abnormality determination value. By monitoring how long the injection actually takes and comparing it against expected values, the system can determine whether current area correction is needed and to what extent, preventing both under-correction and over-correction.
Solution Approach 2:
The abnormality determination value dynamically adapts based on the measured injection duration. When injection duration indicates normal operation, a standard determination value is used. When injection duration deviates from expected ranges, the determination value is adjusted accordingly, allowing the system to respond appropriately to different operating conditions without excessive correction.
Data Source
AI summary
An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of the fuel injection valve; a fuel injection quantity correction unit that calculates an A/F correction amount and corrects the command value of the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction. The injection control device further includes an area correction abnormality determination unit that determines an area correction abnormality. The area correction abnormality determination unit changes the abnormality determination value.