Dual Hydrogen Injectors for Internal Combustion Engine Load Adaptation
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Solution Overview
Problem
Existing hydrogen injection systems for internal combustion engines face challenges in achieving efficient hydrogen introduction, particularly in idling and low-load operations, due to limitations in direct injection methods that require high sealing pressures and are costly to implement, leading to restricted cylinder output and increased energy consumption.
Innovation Solution
A dual-gas injector system where one injector injects hydrogen into the intake pipe and another directly into the combustion chamber, allowing for flexible operation based on engine load states, with adjustable pressures and control units to optimize hydrogen delivery, reducing energy consumption and improving mixture formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct injection of gaseous hydrogen into combustion chamber is implemented, then hydrogen injection efficiency is improved, but device complexity and manufacturing cost increase due to requirement of very large sealing seat cross-sections and high injector dynamics
Solution Approach 1:
The patent divides the hydrogen injection function into two separate systems: a direct injection system for high-load operation and an indirect injection system via intake pipe for low-load operation. This segmentation allows each injector to be optimized for its specific operating range, reducing the complexity requirements for the direct injection system while maintaining overall injection efficiency across all load states.
Solution Approach 2:
The patent implements a dynamically switchable injection system that adapts between direct and indirect injection modes based on engine load state. This dynamic operation allows the system to use the simpler indirect injection method during low-load conditions, thereby reducing the operational demands and complexity requirements on the direct injection system.
2Power
If direct injection of gaseous hydrogen is implemented, then cylinder output is improved, but energy consumption increases due to high sealing pressures required
Solution Approach 1:
The system dynamically selects between direct and indirect injection based on engine load, using the energy-efficient indirect injection method during low-load operation where high cylinder output is not required, thereby reducing overall energy consumption while maintaining the capability for high power output when needed.
Solution Approach 2:
The patent changes the injection pressure parameter dynamically by using lower pressures in the indirect injection system compared to the direct injection system. This parameter change allows energy-efficient operation during low-load conditions while preserving the high-pressure direct injection capability for high-power demands.
3Measurement precision
If pure direct injection system is used, then hydrogen injection precision is improved, but adaptability to different load states deteriorates due to lack of rapid initial-pressure control
Solution Approach 1:
The patent segments the injection system into two pathways with different characteristics: direct injection for precision metering at high loads and indirect injection via intake pipe for rapid pressure adaptation at low loads. This segmentation allows each subsystem to be optimized for its specific function, improving overall system adaptability while maintaining injection precision where required.
Solution Approach 2:
The dual-injection system provides multi-functionality by enabling both direct and indirect injection modes within a single hydrogen supply system. This universality allows the system to adapt to different load states and operational requirements while maintaining precise hydrogen metering capability across the entire operating range.
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 enables efficient hydrogen injection across all load states, reduces energy consumption, and optimizes mixture formation, while allowing for cost-effective design and production by utilizing both injectors only as needed, thereby addressing the limitations of direct injection systems.
Implementation Method 1
a first pressure controller (14) is situated in a supply line to the first gas injector (3)... A first pressure controller 14 is situated in main line 12 in the flow direction from hydrogen tank 11 to first gas injector 3 downstream from the branching of branch line 13
Implementation Method 2
a second pressure controller (15) is situated in a supply line to the second gas injector (4)... A second pressure controller 15 is additionally situated in branch line 13
Implementation Method 3
the hydrogen injection system preferably also includes an ignition device such as a spark plug
Implementation Method 4
The present invention additionally relates to an internal combustion engine having a hydrogen injection system according to the present invention
Data Source
AI summary
A hydrogen injection system for an internal combustion engine having an intake pipe and a combustion chamber. The system includes a first gas injector, which is configured to carry out an injection of hydrogen into the intake pipe of the internal combustion engine, and a second gas injector, which is configured to carry out an injection of hydrogen directly into a combustion chamber of the internal combustion engine.