Hydrogen Intake Injection Layout for Low-Flow Fuel Metering
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Solution Overview
Problem
Conventional fuel injection systems for hydrogen-powered internal combustion engines struggle to supply fuel appropriately at low flow rates, as the minimum injection quantity of the fuel injection valve increases with maximum flow rate, leading to excessive fuel supply during idling.
Innovation Solution
A dual fuel injection system comprising a high-flow rate first fuel injection valve and a low-flow rate second fuel injection valve, controlled by an ECU, to manage fuel supply efficiently across varying engine loads, with the second valve operating during low flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum flow rate of the fuel injection valve is increased to supply sufficient fuel volume for hydrogen combustion, then the heat generation capability is improved, but the minimum injection quantity increases causing excessive fuel supply during idling
Solution Approach 1:
The fuel injection system is segmented into two separate fuel injection valves: a first fuel injection valve with high maximum flow rate for normal operation, and a second fuel injection valve with low minimum injection quantity for idling conditions. This segmentation allows each valve to be optimized for its specific operating range, resolving the contradiction between high power output capability and precise low-flow control.
2Device complexity
If a single fuel injection valve is used to simplify the system structure, then the device complexity is reduced, but the ability to appropriately supply fuel across varying flow rates deteriorates
Solution Approach 1:
The system dynamically switches between the first fuel injection valve and the second fuel injection valve based on the required fuel flow rate. The ECU determines which valve to activate according to operating conditions, enabling the system to adapt to varying flow rate requirements while maintaining relatively simple individual valve designs.
Data Source
AI summary
A fuel supply device for a four-cycle internal combustion engine using hydrogen as fuel and including cylinders, comprising: an intake passage including a branch portion branching from an upstream side toward a downstream side so as to correspond to the number of cylinders, a single pipe portion on an upstream side of the branch portion, and intake port portions on a downstream side of the branch portion; and a plurality of first fuel injection valves provided in each of the intake port portions, wherein a maximum injection period of the first fuel injection valve is corresponding to an opening period of an intake valve of the internal combustion engine, a second fuel injection valve is provided in the single pipe portion or the branch portion, and a minimum injection quantity of the second fuel injection valve is smaller than a minimum injection quantity of the first fuel injection valve.