Dual Injection Valve Control for Engine Fuel Accuracy
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Solution Overview
Problem
In internal combustion engines using both direct and port fuel injection valves, maintaining accurate fuel injection control becomes complicated when individual valve control is required, leading to potential clogging issues with port injection valves if they are not operated frequently enough.
Innovation Solution
A control method where the direct injection valve adjusts its fuel injection amount based on engine operation conditions, while maintaining the port injection valve at a fixed amount in a predetermined operation region, ensuring the port injection valve is not idle for extended periods and simplifying fuel injection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fuel injection amounts of both direct injection and port injection valves are individually controlled according to engine operation conditions, then the fuel injection control accuracy is improved, but the control complexity increases
Solution Approach 1:
The patent extracts the control variable from the port injection valve by fixing its fuel injection amount to a predetermined value. This removes the port injection valve from the dynamic control loop, leaving only the direct injection valve to be individually controlled according to engine operation conditions, thereby maintaining control accuracy while reducing control complexity
Solution Approach 2:
The patent segments the fuel injection function into two parts: a fixed portion handled by the port injection valve and a variable portion handled by the direct injection valve. This segmentation allows the system to maintain the benefits of dual injection while simplifying the control strategy by assigning different control modes to different components
2Ease of operation
If the port injection fuel injection valve is not operated frequently, then the direct injection can maintain superior responsiveness and controllability, but the port injection valve tends to clog
Solution Approach 1:
The patent establishes a predetermined fuel injection amount for the port injection valve that ensures periodic operation. This preliminary设定 of a fixed injection amount guarantees that the valve will operate regularly under various engine conditions, preventing clogging while allowing the direct injection valve to handle the variable control demands
Solution Approach 2:
The patent ensures continuous useful action by maintaining a predetermined fuel injection amount through the port injection valve across multiple operation regions. This continuous operation prevents the valve from idle periods that would lead to clogging, while the direct injection valve continues to provide responsive and controllable fuel injection adjustment
Data Source
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AI summary
Internal combustion engine (1) has direct injection fuel injection valve (8) and port injection fuel injection valve (9). A requested fuel injection amount is calculated according to an engine operation condition. When the requested fuel injection amount is in first operation region (R1) in which the minimum fuel injection amount of direct injection fuel injection valve (8) is exceeded, a direct injection fuel injection valve (8) fuel injection amount is adjusted based on the requested fuel injection amount and a fixed amount, while maintaining a port injection fuel injection valve (9) fuel injection amount at the fixed amount. First operation region is at least a region in which the requested fuel injection amount exceeds the direct injection fuel injection valve minimum fuel injection amount. In first operation region, the port injection fuel injection valve fuel injection amount is fixed at the minimum fuel injection amount of port injection fuel injection valve.