Fuel Dilution Quantification for Diesel Engine Oil Viscosity
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Solution Overview
Problem
The post-injection of fuel for diesel particulate filter (DPF) regeneration in diesel engines leads to fuel dilution of engine motor oil, reducing its viscosity and lubricating effectiveness, as unburned fuel is deposited on cylinder walls and returned to the oil supply.
Innovation Solution
A data processing system executes an algorithm that calculates the quantity of post-injected fuel retained in the engine motor oil film on the cylinder walls and returned to the oil supply, using data such as engine speed, in-cylinder pressure, and temperature, to quantify fuel dilution and estimate oil viscosity degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If post-injection of fuel is performed for DPF regeneration, then exhaust gas temperature is elevated to burn off trapped particulates, but fuel dilution of motor oil occurs reducing its viscosity and lubricating effectiveness
Solution Approach 1:
The system continuously monitors engine operating parameters including fuel injection quantity, injection timing, engine speed, and load to calculate the amount of fuel post-injected for DPF regeneration. This feedback information is used to quantify fuel dilution of motor oil and provide timely warnings when oil change is needed, allowing the system to adapt maintenance schedules based on actual fuel dilution conditions
Solution Approach 2:
The system uses the engine's own operating data and parameters to self-diagnose and quantify fuel dilution of motor oil. By utilizing existing sensors and control units already present in the engine management system, the patent enables the engine to monitor its own oil condition without requiring external diagnostic equipment
2Object-generated harmful factors
If post-injection of fuel is performed for DPF regeneration, then particulate matter is burned off in the DPF, but unburned fuel is deposited on cylinder walls and returned to the oil supply
Solution Approach 1:
The system performs preliminary calculation of fuel dilution by monitoring fuel injection parameters before actual fuel dilution significantly degrades oil quality. By calculating the expected fuel dilution based on post-injection quantity and engine operating conditions, the system can warn operators in advance and schedule oil changes before severe contamination occurs
Solution Approach 2:
The control unit acts as an intermediary between the fuel injection system and the oil lubrication system. It receives data from the fuel injection system, processes this information through algorithms that consider engine speed, load, and injection timing, and generates warnings about oil contamination levels, bridging the gap between these two systems
3Ease of operation
If traditional oil change intervals based on time and mileage are used, then oil change scheduling is simple, but they do not account for accelerated oil degradation from fuel dilution during DPF regeneration
Solution Approach 1:
The system changes the parameter basis for oil change scheduling from fixed time/mileage intervals to dynamic calculations based on actual fuel dilution conditions. By incorporating variables such as post-injection fuel quantity, engine speed, load, and temperature, the system adapts oil change intervals to reflect actual oil degradation rates, improving both precision and operational simplicity
Data Source
AI summary
A system and method for estimating the effect of forced regeneration of a diesel particulate filter (22) by post-injection of fuel on fuel dilution of engine motor oil.