Hydrogen Direct Injection Pressure Layout for Faster Response
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Solution Overview
Problem
Existing direct injection systems for gaseous fuels in combustion engines face challenges with pressure control dynamics and flow rate precision, particularly due to large control volumes and high response inertia, which are exacerbated by the need for rapid pressure changes and limited space within the engine compartment.
Innovation Solution
A novel system design separates pressure-control and flow-control components, with the pressure-control unit reducing fuel pressure to a constant intermediate level and the flow-control valve adjusting it to the desired setpoint, minimizing control volume and response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure-control unit integrates both tank pressure stabilization and dynamic control, then the system is simpler in structure, but the control volume becomes large resulting in high response inertia and slow pressure response
Solution Approach 1:
The patent divides the pressure control function into two separate components: a first pressure control unit for tank pressure stabilization and a second pressure control unit for dynamic injection pressure control. This segmentation reduces the control volume of the second unit, enabling faster pressure response while maintaining system functionality.
2Volume of moving object
If the pressure-control unit is installed in the engine compartment, then the system is more compact, but it exposes the unit to vibrations, thermal stresses, and mechanical stresses
Solution Approach 1:
The patent separates the pressure control units from the engine compartment by positioning them in the vehicle body. The first pressure control unit is located near the gas reservoir, and the second unit is positioned to minimize exposure to engine compartment stresses, while flexible lines maintain the fluid connection.
3Loss of time
If the control volume is reduced to improve pressure control dynamics, then the response time decreases, but the component size and weight are reduced
Solution Approach 1:
By segmenting the pressure control system into two separate units with distinct functions, the patent enables the second unit to have a smaller control volume optimized for rapid response, while the first unit handles stabilization. This segmentation allows each unit to be sized appropriately for its specific function rather than requiring a large unified structure.
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 fast and accurate pressure control, reducing deviations and improving system responsiveness, while also reducing component size, weight, and complexity, thus optimizing engine performance.
Implementation Method 1
a pressure-control unit (2) which is designed to convert a supplied variable pressure level of the gaseous fuel into a fixed constant output pressure level
Implementation Method 2
a flow-control valve (6) disposed along the fluid connection (5) and designed to adjust the constant output pressure level of the gaseous fuel to a desired setpoint pressure
Data Source
AI summary
The present invention relates to a device for direct injection of a gaseous fuel, in particular hydrogen, which device comprises: a pressure-control unit which is designed to convert a supplied variable pressure level of the gaseous fuel into a fixed constant output pressure level; a distributor unit which is connected to at least one injector for direct injection of the gaseous fuel, which has been guided through the pressure-control unit, into a combustion chamber; and a fluid connection between the pressure-control unit and the distributor unit in order to guide the gaseous fuel at a constant output pressure downstream towards the distributor unit. The device is characterized in that a flow-control valve is disposed along the fluid connection and designed to adjust the constant output pressure level of the gaseous fuel to a desired target pressure not exceeding the output pressure level.