Internal Combustion Engine Soot Suppression via Delayed Injection Timing
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Solution Overview
Problem
Existing gasoline direct injection engine technologies are inadequate in suppressing soot generation, particularly when combustion stoppage thresholds are reached, leading to increased soot production due to temperature changes in the combustion chamber.
Innovation Solution
An internal combustion engine control device and method that selectively performs single or split fuel injections within a predetermined stroke, with a combustion degree of stoppage determination unit to assess threshold conditions, and an internal combustion engine control unit that delays fuel injection timing in soot suppression control to minimize soot generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel injection timing is advanced to improve combustion efficiency, then power output increases, but soot generation increases when combustion stoppage reaches threshold degree
Solution Approach 1:
The patent applies dynamic adjustment of fuel injection timing based on real-time detection of combustion stoppage degree. The control unit dynamically switches between normal injection timing (for power) and delayed injection timing (for soot suppression) depending on whether combustion stoppage reaches the threshold degree, making the injection strategy adaptive rather than fixed
Solution Approach 2:
The patent changes the fuel injection timing parameter based on combustion stoppage conditions. When combustion stoppage reaches threshold degree, the injection timing is delayed relative to the normal timing, thereby changing the combustion characteristics to reduce soot formation while maintaining acceptable power output
2Object-generated harmful factors
If split injection is used to suppress soot, then soot generation decreases, but combustion stability deteriorates when combustion stoppage is severe
Solution Approach 1:
The patent dynamically selects between split injection and single injection modes based on combustion stoppage degree. When stoppage is mild, split injection is used for soot suppression; when stoppage reaches threshold degree, single injection with delayed timing is used to ensure combustion stability, making the injection strategy adaptive to combustion conditions
Solution Approach 2:
The patent substitutes the complex multi-stage split injection mechanism with a simpler single injection approach when combustion stoppage is severe. This replacement prioritizes combustion stability over soot suppression in extreme conditions, using delayed timing to achieve acceptable emissions while ensuring reliable combustion
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
Effectively suppresses soot generation by adapting injection strategies based on combustion stoppage thresholds, ensuring optimal fuel vaporization and reduced soot formation even during temperature changes.
Implementation Method 1
causes a fuel injection timing in the single injection of the soot suppression control to be delayed with respect to the fuel injection timing in the single injection of the normal control
Data Source
AI summary
An internal combustion engine control device includes a combustion degree of stoppage determination unit which determines whether stoppage of combustion of an internal combustion engine has reached a threshold degree, and an internal combustion engine control unit which performs a normal control in the case that the combustion of the engine is resumed in a state where stoppage of combustion has not reached the threshold degree, and performs a soot suppression control in the case that the engine combustion is resumed in a state where stoppage of combustion has reached the threshold degree. In the soot suppression control, the split injection or the single injection is carried out within the predetermined stroke, and the engine control unit causes a fuel injection timing in the single injection of the soot suppression control to be delayed with respect to the fuel injection timing in the single injection of the normal control.