Hydrogen Engine Controller for Embrittlement Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In hydrogen engines, the permeation of hydrogen gas can cause metal components around the combustion chamber to become brittle, leading to potential engine performance issues due to excessive in-cylinder pressure and temperature, which existing technologies have not adequately addressed.
Innovation Solution
A controller for a hydrogen engine that calculates the peak in-cylinder pressure before ignition and adjusts the ignition timing and fuel injection timing to ensure the pressure remains within a safe threshold, limiting hydrogen embrittlement by advancing the ignition timing and potentially retarding the fuel injection timing or delaying the intake valve closing, thereby controlling the hydrogen partial pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If hydrogen gas is used as fuel in the engine, then high efficiency and clean combustion are achieved, but metal components around the combustion chamber become brittle due to hydrogen permeation
Solution Approach 1:
The patent applies parameter changes by controlling the peak in-cylinder pressure to remain below a specific threshold value. This pressure parameter control prevents excessive hydrogen partial pressure that would cause hydrogen permeation into metal components, thereby maintaining component durability while still using hydrogen as fuel for efficient combustion
2Power
If the in-cylinder pressure is increased to improve power output, then engine power increases, but the risk of hydrogen embrittlement in metal components increases
Solution Approach 1:
The patent establishes and maintains a threshold value for peak in-cylinder pressure. By controlling the pressure parameter to stay below this threshold, the patent prevents hydrogen embrittlement while still allowing the engine to operate at sufficient power levels for practical applications
Solution Approach 2:
The patent employs feedback control by calculating the peak in-cylinder pressure based on the operating state and comparing it against the threshold value. When the pressure approaches or exceeds the threshold, the control content is adjusted to bring the pressure back within safe limits, creating a closed-loop control system that prevents hydrogen embrittlement
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
Effectively reduces the risk of hydrogen embrittlement in metal components by managing the in-cylinder pressure to prevent excessive hydrogen partial pressure, enhancing engine stability and performance.
Implementation Method 1
metal components around a combustion chamber may become brittle due to permeation of hydrogen
Data Source
AI summary
The ECM calculates a peak value of an in-cylinder pressure before ignition based on the operating state of the hydrogen engine. When the peak value of the in-cylinder pressure before ignition exceeds a threshold value, the ECM performs an advancement correction of the ignition timing such that the peak value becomes less than or equal to the threshold value.