Fuel Injection Control Device Cold Startup Correction
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Solution Overview
Problem
During cold startup of an internal combustion engine, fuel vaporization failures and adhesion to wall surfaces occur, leading to inefficient fuel injection as existing systems struggle to accurately adjust direct and port injection modes to optimize fuel contribution to combustion.
Innovation Solution
A fuel injection control device that calculates and adjusts 'increase-after-startup correction values' and 'basic warmup increase correction values' based on the number of combustion cycles and coolant temperature, prioritizing port injection over direct injection to address fuel adhesion and vaporization issues, ensuring appropriate fuel injection amounts across different modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel injection amount in direct injection and port injection are increased in the same manner during the cold time, then the fuel vaporization failure and adhesion to wall surface are addressed, but the amount of fuel that contributes to actual combustion becomes excessive or insufficient
Solution Approach 1:
The patent applies local quality by differentiating the correction strategy between direct injection and port injection. Different correction values are calculated based on the injection area (direct injection into combustion chamber vs. port injection into intake port), allowing each injection type to receive appropriate correction tailored to its specific characteristics and failure modes during cold operation.
Solution Approach 2:
The patent segments the fuel injection correction into two distinct correction values: one for direct injection and another for port injection. This segmentation allows independent optimization of correction amounts for each injection type based on their respective areas and vaporization characteristics, rather than applying a uniform correction to both.
2Reliability
If the fuel injection amount is increased during cold time, then fuel vaporization failure is addressed, but fuel adhesion to wall surface increases
Solution Approach 1:
The patent applies local quality by differentiating the correction strategy between direct injection and port injection. Different correction values are calculated based on the injection area (direct injection into combustion chamber vs. port injection into intake port), allowing each injection type to receive appropriate correction tailored to its specific characteristics and failure modes during cold operation.
Data Source
AI summary
A cold-time fuel increasing section calculates, as increase correction values for a required injection amount, an increase-after-startup correction value, which attenuates with an increment of the number of times of combustion carried out after startup of the internal combustion engine, and a basic warmup increase correction value, which attenuates with an increase in a temperature of coolant in the internal combustion engine. The cold-time fuel increasing section calculates the increase correction values such that the increase-after-startup correction value when the port injection mode is selected is greater than the increase-after-startup correction value when the single direct injection mode is selected, and that the basic warmup increase correction value when the port injection mode is selected is less than the basic warmup increase correction value when the single direct injection mode is selected.