Fuel Injection Apparatus Deposit Removal Control
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Solution Overview
Problem
Existing fuel injection apparatuses for internal combustion engines with multiple cylinders face challenges in maintaining the target air-fuel ratio during deposit removal operations, as increasing fuel injection pressure and reducing injection frequency can lead to deviations in air-fuel ratio due to incomplete mode switching from divided to single injection modes.
Innovation Solution
A fuel injection apparatus with an electronic control unit that sequentially controls fuel injectors to switch from divided to single injection modes and increases fuel pressure only after all injectors are in the single injection mode, ensuring precise deposit removal without air-fuel ratio deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of fuel injection times is reduced to remove deposits, then deposit removal effectiveness is improved, but total fuel injection amount increases causing air-fuel ratio deviation
Solution Approach 1:
The patent changes the fuel injection pressure parameter during deposit removal operations. By increasing fuel pressure, the system achieves effective deposit removal with fewer injection cycles while maintaining control over total fuel quantity, thus resolving the contradiction between deposit removal effectiveness and air-fuel ratio precision.
2Reliability
If fuel injection pressure is increased to remove deposits, then deposit removal effectiveness is improved, but air-fuel ratio control precision deteriorates
Solution Approach 1:
The patent applies preliminary action by determining deposit adhesion status before executing injection operations. The ECU decides whether to perform deposit removal based on detected conditions, and only then adjusts pressure and injection parameters. This preliminary determination prevents unnecessary pressure increases that would disrupt air-fuel ratio control, thus resolving the contradiction between deposit removal effectiveness and air-fuel ratio precision.
3Reliability
If the number of injection times is reduced for all cylinders, then deposit removal is improved, but total fuel amount increases leading to air-fuel ratio deviation
Solution Approach 1:
The patent applies local quality by enabling deposit removal operations for individual cylinders based on their specific conditions rather than uniformly for all cylinders. The ECU can selectively perform deposit removal on cylinders where deposits are detected, while maintaining normal injection operations on other cylinders. This localized approach prevents excessive total fuel injection and maintains air-fuel ratio precision while still achieving effective deposit removal where needed.
Data Source
AI summary
A fuel injection apparatus for injecting fuel to an engine having cylinders, includes: injectors corresponding to the cylinders; a regulator for fuel pressure supplied to the injectors; and a processor. The processor performs: deciding to start a deposit removal for removing deposits adhering to injector-nozzles; and controlling each injector to inject fuel in a single injection mode for injecting one time or a divided injection mode for injecting multiple times in one combustion cycle and control the regulator based on engine operation condition. The controlling includes, when controlling each injector to inject fuel in the divided injection mode based on the engine operation condition, sequentially controlling each injector to reduce injection number in one combustion cycle when the deposit removal is decided to be started, and then controlling the regulator to increase fuel pressure.