Turbocharged Engine Control With Staged Injection for Stable High-Idle
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Solution Overview
Problem
Existing engine control methods that retard fuel injection timing to quickly operate a turbocharger during high-idle lead to unstable combustion and increased HC discharge, limiting load application performance and environmental impact.
Innovation Solution
Implement a rotation speed increase mode with one stage of fuel injection, switch to a high-idle mode with two stages of fuel injection, and adjust the timing of the second stage fuel injection to retard it relative to the first stage, followed by a load application mode to stabilize combustion and reduce HC discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fuel injection timing is excessively retarded during high-idle to quickly operate turbocharger, then load application performance is improved, but combustion becomes unstable and HC discharge increases
Solution Approach 1:
The fuel injection process is divided into two distinct stages: a first stage injection and a second stage injection. This segmentation allows each injection to serve different functions - the first stage provides baseline combustion while the second stage, retarded relative to the first, enhances exhaust energy for turbocharger operation without compromising overall combustion stability.
Solution Approach 2:
The invention changes the timing parameter of the second stage fuel injection relative to the first stage injection. By retarding the second stage timing specifically (while maintaining the first stage timing), the system optimizes exhaust gas energy for turbocharger speed while controlling HC discharge through the dual-stage approach.
2Power
If fuel injection timing is retarded to increase exhaust energy, then turbocharger operation speed is improved, but HC discharge increases causing environmental impact
Solution Approach 1:
By segmenting fuel injection into two stages with different timing characteristics, the system can optimize exhaust energy generation (through the retarded second stage) while maintaining combustion stability (through the first stage injection), thereby reducing HC discharge compared to single-stage retarded injection.
Solution Approach 2:
The second stage fuel injection is applied partially - it is retarded to enhance exhaust energy but not excessively so, as the dual-stage approach allows the first stage to provide a foundation for stable combustion. This partial application of retardation achieves the desired exhaust energy without the full negative effects of excessive single-stage retardation.
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
This approach achieves satisfactory load application performance while suppressing HC discharge, maintaining stable combustion and reducing environmental impact by optimizing fuel injection timing and stages.
Implementation Method 1
a rotation speed increase mode execution unit configured to execute a rotation speed increase mode which is a mode for increasing a rotation speed of the engine
Data Source
AI summary
In this engine control device for controlling an engine with a turbocharger, a rotation speed increase mode includes at least one stage of fuel injection in one combustion cycle of the engine, a high-idle mode includes at least two stages of fuel injection in one combustion cycle of the engine, and a high-idle mode execution unit is configured to retard the timing of the second stage fuel injection in one combustion cycle of the engine in the high-idle mode, relative to the timing of the first stage fuel injection in one combustion cycle of the engine in the rotation speed increase mode.