Hydrogen Direct Injection Pressure Control With Split Regulation
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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 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 device complexity is reduced, but control volume increases and response inertia increases
Solution Approach 1:
The single pressure-control unit is segmented into two separate units: 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 and response inertia of the second unit while maintaining the functionality of the first unit, thereby reducing response time without significantly increasing overall device complexity.
2Volume of moving object
If pressure-control unit is installed in engine compartment, then space utilization is improved, but mechanical and thermal stresses increase
Solution Approach 1:
The pressure-control system is segmented into two units with different placement strategies: the first pressure-control unit is installed outside the engine compartment to avoid mechanical and thermal stresses, while the second pressure-control unit is installed inside the engine compartment for compact space utilization. This segmentation allows each unit to be placed in the most suitable location for its specific function.
Solution Approach 2:
A flexible fluid connection acts as an intermediary between the two pressure-control units, allowing the system to span across the engine compartment boundary. This flexible connection transmits fuel at constant pressure while isolating the first pressure-control unit from the harmful mechanical and thermal stresses in the engine compartment.
3Speed
If control volume is reduced, then response inertia is reduced and pressure control dynamics are improved, but device complexity increases
Solution Approach 1:
The control system is segmented into two independent pressure-control units, each with its own control volume. The second pressure-control unit has a reduced control volume optimized for fast dynamic response, while the first unit handles stabilization. This segmentation enables fast pressure control without requiring the entire system to have reduced complexity, as each unit is optimized for its specific function.
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 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) which is disposed along the fluid connection (5) and is 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.