Fuel Injection Valve Drive Pulse Correction for Cylinder Variation
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Solution Overview
Problem
Internal combustion engines face variations in fuel injection amounts across cylinders due to manufacturing processes and secular degradation of fuel injection valves, affecting air-fuel ratio control and exhaust emission performance.
Innovation Solution
A control device calculates and corrects the drive pulse width of fuel injection valves based on valve-opening and valve-closing response delay times, ensuring consistent fuel injection amounts across cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control based on air-fuel ratio sensor is used to correct injection amount, then air-fuel ratio accuracy is improved, but response delay increases and cannot compensate for valve-opening/closing response variations
Solution Approach 1:
The system performs preliminary measurement and correction of valve-opening delay and valve-closing delay for each fuel injection valve, storing these characteristics in advance. This allows the control device to compensate for individual valve response variations before actual fuel injection occurs, eliminating the need for slow air-fuel ratio feedback while maintaining high accuracy.
2Manufacturing precision
If individual valve response correction is performed for each fuel injection valve, then injection amount consistency across cylinders is improved, but device complexity increases
Solution Approach 1:
Each fuel injection valve's control system uses its own measured valve-opening delay and valve-closing delay characteristics to automatically correct its drive pulse timing. The control device stores and applies individual correction values for each valve, enabling self-compensation without requiring complex external intervention or additional hardware beyond standard control components.
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 stabilizes fuel injection amounts, improving the accuracy of air-fuel ratio control and reducing variations, thereby enhancing engine performance and emission quality.
Implementation Method 1
A magnetic force generated by a current flowing to a coil built in the fuel injection valve for opening and maintaining an open state of the fuel injection valve
Data Source
AI summary
Provided is a control device for an internal combustion engine which can suppress a relative variation in the fuel injection amount for each cylinder. A drive pulse width to drive the fuel injection valve for injecting the fuel is calculated according to a driving state of the internal combustion engine, any one or both of a valve-opening response delay time and a valve-closing response delay time with respect to a drive pulse signal of the fuel injection valve for each fuel injection value are calculated, and the drive pulse width is corrected to make an injection amount of each fuel injection valve matched to a predetermined injection amount based on any one or both of the valve-opening response delay time and the valve-closing response delay time calculated for each fuel injection valve.