Engine Oil Dilution Detection via Post-Injection Fuel Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The continuous post-injection of fuel in diesel engines leads to fuel dilution in engine oil, reducing oil viscosity and potentially damaging engine parts, while also making it difficult to simultaneously reduce nitrogen oxide (NOx) and particle materials (PM) emissions.
Innovation Solution
An engine control apparatus and method that calculates the inflow fuel amount adsorbed on the inner cylinder wall and introduced into the oil pan, determines the vaporization and consumption fuel amounts based on engine operating conditions, and calculates the dilution rate of engine oil. When the dilution rate exceeds a reference value, the system alerts the driver to exchange the engine oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If post injection of fuel is continued to regenerate DPF, then particle materials (PM) emission is reduced, but fuel amount in engine oil continuously increases and viscosity of engine oil is lowered
Solution Approach 1:
The control apparatus calculates the fuel amount incorporated into engine oil during post-injection and predicts the future fuel accumulation trend before it reaches harmful levels. By performing this calculation in advance, the system can proactively notify the driver to exchange oil before viscosity degradation affects lubrication performance, thus preventing the worsening effect while maintaining the beneficial post-injection regenerative process.
2Reliability
If post injection is performed to maintain DPF carrier temperature, then DPF regeneration is achieved, but engine oil is diluted and parts may be damaged
Solution Approach 1:
The control apparatus continuously monitors post-injection fuel amounts and calculates the corresponding fuel incorporation into engine oil. This feedback mechanism allows the system to quantify the exact amount of fuel diluting the oil and provide accurate predictions about future oil conditions, enabling informed driver notifications that balance DPF regeneration needs with engine oil protection.
3Object-generated harmful factors
If nitrogen oxide (NOx) reduction apparatus is installed, then NOx emission is reduced, but natural regeneration effect of DPF is significantly reduced
Solution Approach 1:
The control apparatus compensates for the reduced natural regeneration effect by calculating and predicting fuel incorporation during post-injection operations. Since NOx reduction apparatus limits natural regeneration, the system proactively monitors and predicts fuel accumulation in engine oil during forced regeneration cycles, allowing timely driver notifications to prevent oil dilution issues that would otherwise go undetected.
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
Prevents engine damage by notifying the driver of the need to exchange engine oil due to dilution, thereby reducing costs associated with damaged parts and maintaining engine performance.
Implementation Method 1
determining a vaporization fuel amount vaporized in the inflow fuel amount based on an operating condition of an engine
Implementation Method 2
determining an inflow fuel amount adsorbed on an inner wall of a cylinder, and introduced into an oil pan
Data Source
AI summary
An apparatus of controlling an engine includes a controller determining an inflow fuel amount adsorbed on an inner wall of a cylinder, and introduced into an oil pan based on the density of a combustion chamber and a post injection fuel amount, determining a vaporization fuel amount vaporized in the inflow fuel amount based on an operating condition of an engine, determining a consumption fuel amount consumed in the vaporization fuel amount based on the operating condition of the engine, and determining a dilution rate of the engine oil based on the inflow fuel amount, the vaporization fuel amount, and the consumption fuel amount; and a display providing an alarm to a driver when the dilution rate of the engine oil is equal to or more than a reference value.