Split Fuel Injection Control for Lambda-Corrected Pattern Switching
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Solution Overview
Problem
Existing fuel injection systems in internal combustion engines suffer from variance in injection amounts due to bouncing motions of valve elements, affecting exhaust characteristics and combustion efficiency, and there is a need for accurate methods to switch injection patterns based on engine operating conditions.
Innovation Solution
A fuel injection control device that performs split injection control, computing request values, applying corrections to compensate for deviations in actual and requested fuel amounts, and deciding injection patterns based on the discrepancy between these values to ensure accurate fuel injection patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If full lift injection is used (valve element reaches fully opened position), then injection amount can be increased, but bouncing motion of valve element causes variance in injection amount
Solution Approach 1:
The patent applies dynamics by making the injection control strategy adaptive rather than fixed. The control device dynamically switches between full lift injection and partial lift injection modes based on real-time operating conditions (engine load, speed, temperature). This dynamic adaptation allows the system to optimize between injection quantity and precision for different operating scenarios, resolving the contradiction between achieving sufficient fuel delivery and maintaining precise control.
Solution Approach 2:
The patent changes the control parameter from a fixed injection strategy to a variable one based on multiple engine parameters. By monitoring engine load, speed, temperature and other parameters, the control device adjusts the injection mode (full lift vs. partial lift) and injection timing accordingly. This parameter-based control enables the system to maintain precise injection control while achieving required fuel quantities across different operating conditions.
2Manufacturing precision
If partial lift injection is used (shorter application time), then injection amount precision is improved, but total injection amount is reduced
Solution Approach 1:
The patent segments the fuel injection process into multiple injection events (split injection) rather than attempting to deliver the entire required fuel amount in a single partial lift injection. By dividing the total injection into multiple smaller injections, the system can use precise partial lift control for each injection event while achieving the cumulative fuel quantity required for proper combustion. This segmentation resolves the contradiction between precision and total quantity.
Solution Approach 2:
The patent employs periodic action through split injection, where fuel is delivered in multiple periodic injection events rather than a single continuous injection. This allows the system to use precise partial lift injection for each periodic event while accumulating the required total fuel quantity over multiple cycles, thereby resolving the contradiction between injection precision and total fuel delivery.
3Productivity
If injection pattern is changed to improve combustion efficiency, then exhaust characteristics improve, but control complexity increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring engine operating parameters (load, speed, temperature, air-fuel ratio) and using this information to automatically adjust the injection pattern. The control device receives feedback from various sensors and dynamically modifies injection timing, duration, and split injection strategies to optimize combustion efficiency. This feedback mechanism manages control complexity by using automated closed-loop control rather than requiring complex manual or open-loop control strategies.
Solution Approach 2:
The patent applies universality by designing a control device that can handle multiple injection patterns (single injection, split injection, full lift, partial lift) within a single unified control system. This multi-functional control device adapts its behavior based on operating conditions, eliminating the need for separate control systems for different injection modes. The universal control approach manages complexity by consolidating multiple functions into one intelligent control unit that automatically selects the appropriate injection strategy.
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
Enables setting of appropriate injection patterns according to engine operation states, effectively suppressing fuel adhesion to engine surfaces and improving combustion efficiency.
Implementation Method 1
a valve element that opens in response to application of electricity to an electromagnetic solenoid incorporated therein
Data Source
AI summary
An injection amount after λ correction corresponding to a command value of the fuel injection amount is calculated by applying correction for compensating a deviation between the request value and an amount of fuel actually burned to an injection amount before λ correction, which is a request value of an amount of fuel to be burned. In PL multi-injection control for performing the split injection, when it is determined whether or not the discrepancy of the injection amount before and after the λ correction is in a small state, the injection pattern of the split injection is decided based on the injection amount before the λ correction, and when it is determined that the discrepancy is not in a small state, the injection pattern of the split injection is decided based on the injection amount after the λ correction.