Dual Injector Fuel Distribution for Low-Load Precision
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Solution Overview
Problem
Conventional dual injector engines face challenges in precisely controlling the air-fuel ratio during low-load driving conditions, particularly at high-temperature idle or high-concentration purge states, due to the inability to control fuel injection time below the minimum injection time, leading to excessive fuel injection and imprecise air-fuel ratio control.
Innovation Solution
A fuel amount distribution method that dynamically switches between single and dual injection operations based on the required fuel injection time, using a controller to set the minimum injection time or required fuel injection time as the fuel injection time, and employing compensation maps and hysteresis to ensure precise air-fuel ratio control, allowing for periodic alternation between injectors to maintain engine durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the minimum injection time of the dual injector is used for fuel injection, then the injector can operate reliably within its design parameters, but the fuel injection amount cannot be controlled precisely in low-load conditions where the required injection time is shorter than the minimum injection time
Solution Approach 1:
The patent divides the fuel injection task from a single dual injector into separate injections from individual injectors. When the required injection time is shorter than the minimum injection time of one dual injector, the system switches to single injector operation, effectively segmenting the injection function to achieve both reliable operation and precise control of small fuel amounts.
2Ease of operation
If the fuel injection time is fixed at the minimum controllable injection time of the dual injector, then the injector operates within its controllable range, but the injected fuel amount becomes larger than the required fuel injection amount in low-load conditions
Solution Approach 1:
The patent implements dynamic switching between dual injector operation and single injector operation based on the required injection time. This dynamic adjustment allows the system to adapt to different operating conditions, preventing excessive fuel injection in low-load conditions while maintaining simple control logic through automated mode switching.
3Device complexity
If both injectors of the dual injector operate simultaneously with equal fuel amount distribution, then the system maintains symmetry and simplicity in control, but the required fuel injection amount cannot be precisely controlled when the total required injection time is less than the minimum injection time of each injector
Solution Approach 1:
The patent segments the fuel injection function by switching from simultaneous dual injector operation to single injector operation when the required injection time is below the minimum threshold. This segmentation resolves the contradiction by allowing precise control of small fuel amounts through selective activation of one injector rather than forcing both to operate with equal distribution.
Solution Approach 2:
The patent changes the operational parameter from dual injector mode to single injector mode based on the required injection time parameter. This parameter-based switching enables the system to maintain simple control architecture while achieving precise fuel injection control by adjusting which injector operates and for how long.
Data Source
AI summary
A fuel amount distribution method is provided to distribute fuel to a plurality of injectors on each of multiple cylinders of an engine with a dual injector. The fuel amount distribution method includes performing, by a controller, a single injection operation in which a single injector of the plurality of injectors constituting the dual injector injects fuel into a corresponding cylinder when a required fuel injection time of the dual injector of at least one cylinder of the multiple cylinders is less than a minimum injection time of each injector of the plurality of injectors of the dual injector. Thereby, precise air-fuel control in a low fuel rate section is achieved.