Fuel Injection Control for Spark-Ignition Engines
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Solution Overview
Problem
In spark-ignition internal combustion engines with intra-cylindrical direct fuel injection, fuel often attaches to the piston crown surface during idling, leading to increased particulate numbers due to constant fuel spray collision at the same position, which is not effectively addressed by existing timing correction methods.
Innovation Solution
A fuel injection control system that dynamically changes fuel injection timing and pressure on a cycle-by-cycle basis to shift the fuel spray collision position on the piston crown surface, preventing continuous collision at the same spot and reducing fuel attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fuel injection timing is advanced during compression process, then fuel attachment to piston crown surface is reduced, but fuel spray continuously collides with the same position causing accumulation
Solution Approach 1:
The fuel injection timing is made variable rather than fixed. The control device changes the fuel injection timing dynamically based on engine operating conditions (idle state detection, accumulation determination). This dynamic adjustment prevents the fuel spray from continuously colliding with the same position on the piston crown surface, thereby reducing fuel accumulation while still maintaining reduced attachment benefits.
Solution Approach 2:
The injection timing parameter is changed based on detected engine state. When idle state and fuel accumulation are determined, the control device advances the fuel injection timing further than under normal conditions. This parameter change optimizes the balance between reducing fuel attachment and preventing continuous collision at the same position.
2Object-affected harmful factors
If constant advancing correction is applied during idling, then fuel attachment is initially reduced, but fuel spray continuously collides with the same position increasing attachment
Solution Approach 1:
The control device incorporates feedback mechanisms to detect idle state and determine fuel accumulation on the piston crown surface. Based on this feedback information, the system adjusts the fuel injection timing dynamically. This closed-loop control ensures that the advancing correction is optimized for each operating condition, preventing the degradation that occurs with constant correction.
Solution Approach 2:
The system transitions from static constant correction to dynamic variable correction. The fuel injection timing is continuously adjusted based on real-time detection of engine state and fuel accumulation conditions, making the control system adaptive rather than fixed, thereby maintaining effectiveness under varying idle conditions.
Data Source
AI summary
A fuel injection control device controls a spark-ignition engine of an intra-cylindrical direct fuel injection type. The engine includes a fuel injection valve configured to directly inject a fuel to an interior of a cylinder, and a spark plug configured to ignite, by a spark, an air-fuel mixture inside the cylinder. When the injected fuel collides with a portion in a predetermined low-temperature state, the fuel is injected while changing a fuel injection condition under predetermined operating conditions so as to restrain a fuel spray from keeping colliding with the same position continuously.