Diesel Engine Fuel Injection Pressure Control for Vegetable Oil
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Solution Overview
Problem
Modern diesel engines optimized for diesel fuel struggle to operate efficiently with vegetable oil due to differences in viscosity and ignition point, requiring different engine control parameters, which complicates operation and increases NOx emissions, and the lack of comprehensive vegetable oil supply hinders market penetration.
Innovation Solution
Adapting diesel engines to adjust injection pressure and duration based on the fuel type, with sensors detecting fuel properties to automatically adjust control parameters, allowing for efficient operation with both diesel fuel and vegetable oil while maintaining low NOx emissions, by lowering injection pressure in high-load ranges and increasing it in low-load ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine is optimized for diesel fuel operation, then diesel fuel efficiency and performance are improved, but the engine cannot efficiently operate with vegetable oil due to different viscosity and ignition point properties
Solution Approach 1:
The control parameters of the engine are made dynamically adjustable based on the detected fuel type. The electronic control unit automatically adapts injection pressure, injection timing, and other parameters according to whether diesel fuel or vegetable oil is detected, allowing the engine to maintain optimal efficiency across different fuel types
Solution Approach 2:
The invention changes key operational parameters (injection pressure, injection timing, air-fuel ratio) based on the fuel type detected. When vegetable oil is detected, the system adjusts these parameters to compensate for its higher viscosity and ignition point, thereby maintaining engine efficiency and performance
2Productivity
If different engine control parameters are used for vegetable oil operation, then combustion efficiency is improved, but NOx emissions increase
Solution Approach 1:
The invention carefully adjusts multiple parameters including injection pressure, injection timing, and air-fuel ratio when operating with vegetable oil. By optimizing the combination of these parameters rather than changing just one, the system achieves good combustion efficiency while controlling NOx emissions through balanced control
3Device complexity
If manual switching between fuel types is required, then control simplicity is maintained, but user convenience and comfort are reduced
Solution Approach 1:
The electronic control unit automatically detects the fuel type using sensors and autonomously adjusts the engine control parameters without requiring manual intervention from the user. The system performs self-diagnosis and self-adjustment, eliminating the need for users to manually switch between fuel modes while maintaining control system simplicity
Solution Approach 2:
The system uses sensors to detect fuel properties and provides feedback to the electronic control unit, which then automatically adjusts control parameters. This closed-loop feedback mechanism enables automatic fuel type recognition and parameter adaptation, improving user convenience without significantly increasing system complexity
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a diesel internal combustion engine, which can be operated with a fuel having a lower ignition temperature and with a fuel having a higher ignition temperature, comprising at least one fuel tank (1), a high-pressure pump (11), an injection system (12), and an electronic controller (17), in which different control parameters for the operation with the fuel having the lower ignition temperature and the operation with the fuel having the higher ignition temperature are stored. According to the invention, control parameters (19, 20) for the injection pressure are stored in the electronic controller (17), wherein the injection pressure for the fuel having the higher ignition temperature is reduced compared to the fuel having the lower ignition temperature in the medium-load range and/or high-load range and is increased compared to the fuel having the lower ignition temperature or remains the same in the low-load range and/or medium-load range.