Dynamic PFI to DI Ratio Control for Engine Knock Mitigation
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Solution Overview
Problem
Internal combustion engines in vehicles often experience knocking, which existing technologies struggle to effectively control, particularly under varying conditions.
Innovation Solution
A method and system that utilize sensors to measure engine knocking intensity and adjust the fuel injection ratio between port fuel injectors and direct fuel injectors, reducing fuel from port injectors and increasing it from direct injectors based on knocking intensity, with adjustments facilitated by a processor and a look-up table, to mitigate engine knocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fuel injection ratio is adjusted to reduce knocking intensity, then knocking is mitigated, but fuel injection system complexity increases
Solution Approach 1:
The system dynamically adjusts the fuel injection ratio between port fuel injectors and direct fuel injectors based on real-time knock detection. The control system varies the PFI/DI fuel ratio according to operating conditions and knock intensity, transitioning from fixed ratio to dynamic adaptive ratio control, thereby mitigating knocking while managing system complexity through intelligent control algorithms
Solution Approach 2:
The invention changes the fuel injection parameters by adjusting the PFI/DI fuel ratio as a controllable variable. By modifying the proportion of fuel delivered through port injection versus direct injection, the system alters combustion characteristics to reduce knocking intensity, using parameter optimization to balance performance and complexity
2Object-affected harmful factors
If fuel from port injectors is reduced and direct injector fuel is increased to control knocking, then knocking intensity decreases, but fuel injection control complexity increases
Solution Approach 1:
The system implements a closed-loop feedback control mechanism where knock sensors continuously monitor combustion events, detect knocking intensity, and feed this information back to the control unit. The controller then adjusts the PFI/DI fuel injection ratio in response to knock feedback, creating an adaptive control system that reduces knocking while managing complexity through automated feedback-based adjustment
Solution Approach 2:
The control system performs self-adjustment of fuel injection ratios based on autonomous knock detection and processing. The ECU automatically determines optimal PFI/DI ratios without external intervention, using embedded algorithms to self-regulate fuel delivery and mitigate knocking, thereby reducing operational complexity while maintaining effective control
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 effectively reduces engine knocking intensity without reducing spark, maintaining optimal fuel economy and torque levels, and automatically adjusts fuel ratios to return to normal when knocking subsides.
Implementation Method 1
one or more sensors of the vehicle measure an intensity of engine knocking for the engine
Implementation Method 2
a ratio of port fuel injector (PFI) fuel to direct fuel injector (DI) fuel, also referred to herein as a PDI ratio, is controlled to reduce knocking for the engine
Data Source
AI summary
In accordance with exemplary embodiments, methods and systems are provided for controlling knocking for an engine of a vehicle having a plurality of different types of fuel injectors and a combustion chamber. In an exemplary embodiment, the system includes one or more sensors of the vehicle and a processor. The one or more sensors are configured to measure an intensity of engine knocking for the engine. The processor is coupled to the one or more sensors, and is configured to at least facilitate adjusting a fuel injection ratio of respective amounts of fuel provided by the plurality of different types of fuel injectors to the combustion chamber, based on the intensity of the engine knocking.