Fuel Injection Control Device for Engine Emission Correction
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Solution Overview
Problem
Internal combustion engines face variations in fuel injection amounts due to individual differences and deterioration of fuel injection valves, leading to deteriorated exhaust emissions and drivability, which existing technologies fail to accurately correct across varying engine temperatures and operational states.
Innovation Solution
A control device that includes a drive unit to supply electric power to fuel injection valves and a correction unit to adjust the injection amount by detecting current changes and learning from NOx purge conditions, ensuring accurate correction during lean states and stable combustion, thereby reducing variations in injection amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection valves are used to supply fuel to combustion chambers, then fuel injection function is achieved, but individual differences and deterioration cause variations in injection amounts
Solution Approach 1:
The patent changes the control parameter from fixed injection timing to variable injection timing based on detected combustion states. By adjusting the injection timing parameter according to actual combustion conditions (detected via ion current or pressure sensors), the system compensates for variations caused by individual valve differences and deterioration, thereby improving injection amount consistency and accuracy
Solution Approach 2:
The patent implements a feedback mechanism where combustion states are detected in real-time (using ion current sensors or pressure sensors) and this information is fed back to adjust subsequent fuel injection timing. This closed-loop control allows the system to continuously correct for valve variations and deterioration, improving both reliability and precision of injection amounts
2Manufacturing precision
If existing correction technologies are used, then some injection amount adjustments are made, but accurate correction across varying engine temperatures and operational states is not achieved
Solution Approach 1:
The patent transitions from static correction tables to dynamic real-time adjustment of injection timing based on detected combustion states. The system continuously adapts injection parameters according to actual engine conditions (temperature, load, combustion quality), enabling accurate correction across varying operational states while maintaining high adaptability to changing engine conditions
Solution Approach 2:
The patent dynamically changes injection timing parameters based on real-time combustion state detection. By adjusting the injection timing parameter according to actual combustion conditions rather than relying on pre-set correction tables, the system achieves both accurate correction and high adaptability to varying engine temperatures and operational states
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
The control device effectively corrects fuel injection amounts across different engine states, improving accuracy and reducing variations, leading to enhanced exhaust emissions and drivability by learning during NOx purge conditions and stable combustion in lean states.
Implementation Method 1
a drive unit configured to supply electric power to a fuel injection valve to perform valve open drive
Data Source
AI summary
A control device includes a drive unit configured to supply electric power to a fuel injection valve to perform valve open drive to supply fuel to a combustion chamber of an internal combustion engine; and a correction unit configured to correct a fuel injection amount of the fuel injection valve. The correction unit is configured to learn the fuel injection amount of the fuel injection valve when NOx purge is performed to reduce and purify the NOx occlusion catalyst.