Fuel Injection Variation Correction via Pressure Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for correcting injection quantity variations in fuel injection valves of internal combustion engines fail to accurately reflect changes during transient operations, leading to incorrect corrections and potential misalignment of injection quantities across cylinders.
Innovation Solution
A control device that utilizes a fuel pressure sensor to calculate and correct injection quantity variations based on fuel pressure decreases during stationary engine operations, ensuring accurate reflection and precise correction without interference from operational state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If injection quantity variation correction is performed based on fuel pressure decrease during transient operation, then the system attempts to correct injection variations, but the correction becomes inaccurate because injection quantity changes with operational state
Solution Approach 1:
The patent segments the operation conditions into stationary and transient states, applying correction only during stationary operations where fuel pressure decrease accurately reflects injection quantity variation. This segmentation prevents wrong corrections during transient operations while maintaining correction effectiveness during stable conditions.
Solution Approach 2:
The system dynamically adjusts the correction strategy based on operational state detection. When transient operation is detected, correction is suspended; when stationary operation is detected, correction is applied. This dynamic adaptation ensures accuracy across varying operational conditions.
2Productivity
If correction is applied during all operations including transient states, then continuous correction is maintained, but wrong corrections occur due to operational state changes affecting fuel pressure decrease
Solution Approach 1:
The system performs preliminary detection of operational state before applying correction. By detecting whether the engine is in stationary or transient operation before executing correction, the system prevents wrong corrections from occurring in the first place, ensuring reliability without sacrificing necessary correction frequency.
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 allows for precise correction of injection quantity variations during stationary engine operations, preventing wrong corrections and maintaining optimal fuel injection across cylinders, thereby enhancing engine performance and efficiency.
Implementation Method 1
a fuel pressure sensor detecting a fuel pressure in the high-pressure fuel passage
Data Source
AI summary
It is determined whether the execution conditions for the injection quantity variation correction are met, based on whether all of following conditions are satisfied: the engine operation is the stationary operation, the injection quantity of a fuel injection valve falls within the predetermined range, and the fuel pressure falls within the predetermined range. When the execution conditions are met, the fuel pressure decrease caused by the fuel injection of the fuel injection valve for each cylinder is calculated based on the output of a fuel pressure sensor, and the injection quantity variation correction to correct the injection quantity variation of the fuel injection valve for each cylinder is performed based on the fuel pressure decrease caused by the fuel injection of each cylinder. Thus, the fuel pressure decrease can be accurately calculated, the injection quantity variation of each cylinder is precisely corrected.