Fuel Injection Control Device for Engine Cylinder Correction
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Solution Overview
Problem
Existing fuel injection control devices in multicylinder engines face issues with abrupt fluctuations in fuel injection amounts during inter-cylinder correction, leading to increased combustion noise, degraded exhaust gas performance, and reduced temperature increase for post-treatment devices.
Innovation Solution
A fuel injection control device that calculates basic injection amounts for main and sub-injections, divides inter-cylinder correction amounts into separate components for each injection type, and adjusts these amounts based on engine load to minimize abrupt fluctuations, ensuring stable fuel injection and optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-cylinder correction is performed by distributing correction amounts to main injection and sub-injection according to basic injection amounts, then fuel injection amount correction among cylinders is achieved, but combustion noise increases and exhaust gas performance deteriorates due to abrupt fluctuations in sub-injection amount
Solution Approach 1:
The patent segments the inter-cylinder correction amount into two distinct components: a first divided correction amount applied only to main injection, and a second divided correction amount applied to both main injection and sub-injection. This segmentation prevents abrupt fluctuations in sub-injection amount by isolating the correction impact, thereby reducing combustion noise while maintaining effective inter-cylinder fuel injection correction.
2Reliability
If inter-cylinder correction is performed by adding all correction amounts to main injection only, then fuel injection amount correction among cylinders is achieved, but temperature increase performance of post-treatment device decreases due to reduced main injection amount
Solution Approach 1:
The patent divides the inter-cylinder correction amount into first and second divided correction amounts, where the first divided correction amount is applied exclusively to main injection. This ensures that sufficient fuel is maintained in main injection to achieve the necessary temperature increase for post-treatment device operation, while the second divided correction amount provides additional correction where appropriate.
3Reliability
If inter-cylinder correction is performed with equal distribution to main injection and sub-injection, then fuel injection amount correction among cylinders is achieved, but injection control precision deteriorates due to lack of differentiated correction
Solution Approach 1:
The patent applies different correction strategies to different injection stages based on local requirements: the first divided inter-cylinder correction amount is applied specifically to main injection where temperature generation is critical, while the second divided correction amount is applied to both main and sub-injection where balanced correction is appropriate. This localized differentiation maintains high injection control precision across different operating conditions.
Data Source
AI summary
Increase in combustion noise and deterioration of exhaust gas performance caused by inter-cylinder correction are prevented, and decrease in temperature rise performance of a diesel particulate removal device caused by inter-cylinder correction is prevented. A fuel injection control device of an engine comprises inter-cylinder correction amount calculation means 5 for calculating, for each cylinder, an inter-cylinder correction amount for correcting by increasing/decreasing a fuel injection amount in each cylinder according to a difference in engine revolution speed between the cylinders, inter-cylinder correction amount division means 6 for dividing the inter-cylinder correction amount into a first divided inter-cylinder correction amount for correcting by increasing/decreasing the basic injection amounts of main injection and sub-injection and a second divided inter-cylinder correction amount for correcting by increasing/decreasing only the basic injection amount of main injection, first correction means 7 for distributing the first divided inter-cylinder correction amount to main injection and sub-injection according to the basic injection amount of main injection and sub-injection, and second correction means 8 for adding the second divided inter-cylinder correction amount to the basic injection amount of main injection.