Triple Fuel Injection Strategy for Combustion Engine Pre-Ignition Control
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Solution Overview
Problem
Internal combustion engines face pre-ignition issues due to uncontrolled ignition before the planned ignition point, leading to high cylinder pressures, wear, and potential failure, especially under conditions of high compression temperatures and low to medium engine speeds.
Innovation Solution
A method involving a triple fuel injection strategy, where a first quantity of fuel is injected during the intake stroke and two partial quantities during the compression stroke, optimizing injection timing and quantities to prevent pre-reactions and reduce pre-ignition frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high compression ratios and high levels of supercharging are used to achieve high compression temperatures, then pre-ignition occurs more frequently, but engine power and efficiency are improved
Solution Approach 1:
The fuel injection process is segmented into three distinct phases: a first injection during the intake stroke, and second and third injections during the compression stroke. This segmentation allows different portions of fuel to be introduced at different times, creating a stratified charge that prevents pre-ignition while maintaining high compression ratios and supercharging levels for improved engine power.
Solution Approach 2:
The first quantity of fuel is injected during the intake stroke before the compression stroke begins. This preliminary action allows the fuel to be distributed in the combustion chamber ahead of time, creating a lean mixture that reduces the risk of pre-ignition during compression while still enabling powerful combustion when ignited.
2Device complexity
If a single fuel injection is performed during the intake stroke, then the injection system is simple, but pre-ignition cannot be effectively prevented under high load conditions
Solution Approach 1:
The fuel injection is divided into three separate injection events with different quantities and timing: first quantity during intake stroke, and second and third quantities during compression stroke. This segmentation enables effective pre-ignition prevention through stratified combustion while using a single injection system, avoiding the need for multiple complex injection systems.
Solution Approach 2:
The injection system performs periodic injection events at specific intervals within the engine cycle: one injection during the intake stroke and two additional injections during the compression stroke. This periodic action pattern allows the system to maintain simplicity while achieving reliable pre-ignition prevention through properly timed fuel delivery.
3Ease of operation
If fuel is injected late during the compression stroke, then the injection timing is simple, but pre-reactions and pre-ignition cannot be effectively avoided
Solution Approach 1:
The first quantity of fuel is injected during the intake stroke, performing a preliminary action that begins the fuel distribution process before compression begins. This early injection creates a foundation for stratified combustion that prevents pre-ignition while maintaining simple timing control through a single injector.
Solution Approach 2:
The compression stroke injection is segmented into two separate injection events: a second quantity injected during early compression and a third quantity injected during late compression. This segmentation provides effective pre-ignition avoidance by creating proper fuel distribution and temperature gradients, while the timing is automatically controlled by the engine's compression cycle.
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
The method effectively minimizes pre-ignition frequency, reducing engine wear and damage by controlling the air-fuel mixture temperature and distribution, thereby ensuring reliable ignition and preventing premature ignition.
Implementation Method 1
a first quantity of fuel is injected into a combustion chamber of a cylinder of the internal combustion engine during an intake stroke of the cylinder. Furthermore, a second quantity of fuel is injected in fractional quantities of fuel into the combustion chamber during a compression stroke
Data Source
Figure 1~2
AI summary
The method involves injecting a fuel quantity in a combustion chamber of a cylinder (12) of an internal combustion engine (11) during an intake stroke of the cylinder. Another fuel quantity is injected in the combustion chamber during a compression stroke of the cylinder. The injection of the latter fuel quantity in the combustion chamber has an injection of a portion of fuel quantity and another portion of fuel quantity in the combustion chamber. An independent claim is included for a device for controlling a fuel injection in an internal combustion engine of a vehicle.