Dual-Fuel Intake Sequencing to Reduce Engine Backfire Risk
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Solution Overview
Problem
Existing engines that use multiple types of fuel face damage from backfires due to the high explosive limits of certain fuels, which can cause ignition when fuel remains in the intake line after the intake valve closes.
Innovation Solution
The engine is equipped with two fuel lines and a control device that regulates the supply of fuels, ensuring the fuel with a lower explosive limit is introduced before the fuel with a higher explosive limit, reducing the amount of fuel remaining in the intake line and minimizing backfire risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of fuel are supplied to the combustion chamber, then the engine can operate with higher flexibility and adaptability, but the risk of backfires increases due to fuel remaining in the intake line
Solution Approach 1:
The control device opens the first fuel supply valve before opening the second fuel supply valve during the intake stroke, ensuring that the first fuel (with lower explosive limit) is supplied to the combustion chamber first. This preliminary sequencing action reduces the amount of fuel remaining in the intake line, thereby minimizing backfire risk while maintaining multi-fuel operational flexibility
Solution Approach 2:
The fuel supply system is divided into two separate fuel lines with independent control valves. The first fuel line supplies fuel with a lower explosive limit, while the second fuel line supplies fuel with a higher explosive limit. This segmentation allows independent control of each fuel type's supply timing, enabling the system to manage backfire risk while maintaining adaptability
2Object-affected harmful factors
If fuel with lower explosive limit is supplied first, then the amount of fuel remaining in the intake line is reduced, but the control complexity increases
Solution Approach 1:
The control device acts as an intermediary that manages the sequencing of the two fuel supply valves. By centrally controlling the opening timing of both valves based on engine operating conditions, the system achieves coordinated fuel supply without requiring complex mechanical sequencing mechanisms, thus reducing overall system complexity while effectively managing backfire risk
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 damage from backfires by controlling the fuel supply sequence, minimizing the risk of ignition and enhancing engine safety.
Implementation Method 1
a second fuel line configured to supply a second fuel having a lower explosive limit that is higher than that of the first fuel to the intake line
Data Source
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AI summary
An engine is provided with: an engine body; an intake line connected to a combustion chamber of the engine body; a first fuel line configured to supply a first fuel to the intake line; a second fuel line configured to supply a second fuel having a lower explosive limit that is higher than that of the first fuel to the intake line; a first flow regulating valve disposed in the first fuel line; a second flow regulating valve disposed in the second fuel line; and a control device configured to control the first flow regulating valve and the second flow regulating valve so that the first fuel is supplied to the combustion chamber before the second fuel is supplied to the combustion chamber in an intake process.