Hydrogen Engine Fuel Port Timing for Backfire Suppression
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Solution Overview
Problem
Hydrogen engines face issues with backfire due to its wide combustible range and fast combustion speed, leading to potential damage to intake paths and decreased engine efficiency when fuel is supplied through the intake port.
Innovation Solution
A hydrogen engine design with a separate fuel supply port and intake port, utilizing a valve train that synchronizes the opening and closing of intake and fuel supply valves, with the fuel supply valve opening timing retarded relative to the intake valve, and incorporating a collar or cover portion to prevent backfire and unburned fuel discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hydrogen fuel is injected into the intake port, then fuel supply is simplified, but backfire occurs and intake path damage risk increases
Solution Approach 1:
The patent divides the fuel supply system into two separate paths: a main fuel supply port for primary hydrogen injection and a sub-fuel supply port for supplementary injection. This segmentation allows the main port to be positioned away from the intake port to prevent backfire, while the sub-port provides additional fueling capability without compromising safety.
Solution Approach 2:
The patent introduces a sub-fuel supply port as an intermediary element between the main fuel supply system and the combustion chamber. This sub-port is strategically positioned to provide fuel supplementation while maintaining safe distances from the intake port, thus mediating between the need for efficient fuel delivery and backfire prevention.
2Object-affected harmful factors
If fuel gas is supplied from the fuel supply port to the combustion chamber, then backfire is suppressed, but unburned fuel may be discharged from the exhaust port decreasing engine efficiency
Solution Approach 1:
The patent employs a valve train that operates the sub-fuel supply valve in conjunction with the intake valve, ensuring that sub-fuel injection occurs only when the intake valve is open and the exhaust valve is closed. This preliminary coordination of valve operations prevents unburned fuel from being discharged through the exhaust port while maintaining backfire suppression.
Solution Approach 2:
The patent implements coordinated control of multiple valves through a shared valve train mechanism, where the operation of the sub-fuel supply valve is feedback-linked to the position of the intake and exhaust valves. This ensures fuel injection timing is optimized based on real-time valve positions, preventing both backfire and unburned fuel discharge.
3Object-affected harmful factors
If a separate fuel supply port is provided, then backfire is suppressed, but device complexity increases
Solution Approach 1:
The patent combines the control of the sub-fuel supply valve with the existing intake valve mechanism through a shared valve train. By merging the actuation systems rather than creating entirely separate control mechanisms, the patent reduces the increase in device complexity while still achieving backfire suppression through the separate fuel supply port.
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
The design effectively suppresses backfire and maintains high engine efficiency by ensuring fuel is supplied directly to the combustion chamber without passing through the intake port, reducing the risk of flame travel and minimizing unburned fuel discharge.
Implementation Method 1
a valve train commonly provided for the intake valve and the fuel supply valve, and configured to open and close the intake valve and the fuel supply valve in conjunction with each other
Implementation Method 2
The hydrogen engine is configured such that a valve opening timing of the fuel supply valve is more retarded than a valve opening timing of the intake valve
Implementation Method 3
a cover portion configured to cover at least a part of an outlet portion of the fuel supply port on a side of the exhaust port in at least a part of a valve opening period of the fuel supply valve
Implementation Method 4
intake air flowing in the intake port and the hydrogen fuel injected from the injector are mixed and supplied to a combustion chamber
Data Source
AI summary
A hydrogen engine using fuel gas containing hydrogen, including: a cylinder; a piston movable within the cylinder; a cylinder head forming a combustion chamber with the piston, and including an intake port connected to the combustion chamber and a fuel supply port connected to the combustion chamber; an intake valve for opening and closing the intake port; a fuel supply valve for opening and closing the fuel supply port; and a valve train commonly provided for the intake valve and the fuel supply valve, and configured to open and close the intake valve and the fuel supply valve in conjunction with each other. The hydrogen engine is configured such that a valve opening timing of the fuel supply valve is more retarded than a valve opening timing of the intake valve.