Gas Fuel Injector Layout in Intake Passage to Prevent Abnormal Combustion
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Solution Overview
Problem
Fuel gas remaining in the air supply passage can lead to abnormal combustion due to unintended ignition, which is not adequately addressed in existing engine designs.
Innovation Solution
The engine configuration includes a surge tank positioned above the intake port, with a communication passage connecting it to the intake port, and gas fuel injectors placed below the central axis of this passage, ensuring quick discharge of gas fuel and preventing residual fuel ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fuel gas is injected into the air supply passage, then the fuel gas can be supplied to the combustion chamber, but the fuel gas may remain in the air supply passage and cause abnormal combustion
Solution Approach 1:
The injection port is positioned asymmetrically on the lower side of the communication passage rather than at the center, creating an asymmetric flow pattern that directs fuel gas toward the intake port and prevents pooling in the surge tank
Solution Approach 2:
The injection port is positioned not only laterally but also vertically (in the up-down direction) below the central axis, utilizing the vertical dimension to create a downward flow direction that leverages gravity and pressure differential to quickly discharge fuel gas from the communication passage
2Device complexity
If the fuel gas remains in the air supply passage, then the system is simple, but abnormal combustion occurs due to unintended ignition
Solution Approach 1:
The invention converts the potential harm of residual fuel gas into a benefit by positioning the injection port to create a flow pattern where the injected fuel gas itself acts as a purge mechanism, pushing remaining fuel gas toward the intake port and preventing accumulation that could lead to abnormal combustion
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 configuration effectively prevents gas fuel from remaining and suppresses abnormal combustion, improving discharge performance and reducing the risk of unintended ignition.
Implementation Method 1
a gas fuel injector that injects a gas fuel; wherein an injection port of the gas fuel injector is provided in the communication passage
Implementation Method 2
the gas fuel can be prevented from remaining and the occurrence of abnormal combustion can be suppressed
Data Source
AI summary
To provide an engine capable of avoiding remaining of gas fuel and suppressing the occurrence of abnormal combustion. An engine includes: a cylinder head; an intake port that is formed in the cylinder head; a surge tank placed on one side in an up-down direction with respect to an inlet portion of the intake port; a communication passage that communicates between the surge tank and the intake port; and a gas fuel injector that injects a gas fuel. An injection port of the gas fuel injector is provided in the communication passage only on an other side in the up-down direction with respect to a central axis of the communication passage.