Engine Control Device for Fuel Injection Deposit Management
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Solution Overview
Problem
Conventional methods fail to accurately predict and timely clean deposits on the injection holes of fuel injection valves in direct-injection engines, particularly due to the adhesion of flowing-back fuel, which affects fuel injection performance.
Innovation Solution
An engine control device and method that adjusts fuel pressure and timing to estimate and correct the deposition amount of deposits, using a controller to integrate deposition data and adjust fuel pressure when the estimated deposition exceeds a threshold, and correcting the unit deposition amount based on the fuel injection timing relative to the piston's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fuel injection timing is set closer to top dead center, then combustion efficiency is improved, but deposition amount of deposits on injection hole increases due to fuel flowing back and adhering
Solution Approach 1:
The patent changes the fuel injection timing parameter to be away from top dead center, sacrificing some combustion efficiency to prevent fuel from flowing back and adhering to the injection hole, thereby reducing deposit formation
Solution Approach 2:
The patent performs preliminary cleaning control by increasing fuel pressure before deposits significantly accumulate, preventing the worsening of injection hole deposition rather than addressing it after the fact
2Manufacturing precision
If fuel pressure is increased to clean deposits, then deposit removal is achieved, but fuel injection performance temporarily deteriorates and energy consumption increases
Solution Approach 1:
The patent implements periodic cleaning control where fuel pressure is increased at specific intervals based on accumulated deposition amounts, alternating between normal injection and cleaning modes to balance deposit removal with maintaining injection performance
Solution Approach 2:
The patent uses feedback from integrated deposition amount data to determine when cleaning is necessary, adjusting fuel pressure based on actual deposit accumulation rather than using fixed schedules
Data Source
AI summary
A controller for controlling a fuel injection valve and a fuel pressure adjustment mechanism integrates a deposition amount of deposits per unit time, and estimates a deposition amount of deposits on an injection hole of the fuel injection valve. The controller causes the fuel pressure adjustment mechanism to increase a fuel pressure, when the estimated deposition amount exceeds a predetermined value, and corrects the unit deposition amount acquired by the deposition amount estimation according to the set fuel injection timing of the fuel injection valve. The controller corrects such that as compared with the unit deposition amount when the fuel injection timing is set to a first timing away from a top dead center of the piston by a first period, the unit deposition amount decreases when the fuel injection timing is set to a second timing away by a second period longer than the first period.