Hydrogen Engine Controller Water Reduction Process
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Solution Overview
Problem
Existing hydrogen engine technologies fail to sufficiently reduce moisture in the exhaust passage after engine stoppage, leading to potential wetting of exhaust system components.
Innovation Solution
A controller for the hydrogen engine that executes a water reduction process by adjusting the air-fuel ratio to a leaner setting and extending the engine operation time after a stop request, reducing the proportion of water vapor in exhaust gas before shutting down, thereby minimizing moisture left in the exhaust passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the hydrogen engine is stopped immediately without additional operation, then the engine response time is improved, but the amount of moisture remaining in the exhaust passage increases
Solution Approach 1:
The controller executes the water reduction process as a preliminary action before actually stopping the engine. By adjusting the air-fuel ratio to a leaner setting and extending operation time after the stop request, the system prepares to reduce moisture content in exhaust gas before shutdown, thereby resolving the contradiction between quick response and moisture reduction.
2Quantity of substance
If the air-fuel ratio is adjusted to a leaner setting during the water reduction process, then the proportion of water vapor in exhaust gas is reduced, but the engine operation time must be extended
Solution Approach 1:
The controller changes the air-fuel ratio parameter to a leaner setting during the water reduction process. This parameter change reduces the proportion of water vapor in exhaust gas while the controller simultaneously extends the operation time to ensure sufficient moisture reduction before shutdown.
3Quantity of substance
If the engine operates longer after the stop request, then the moisture reduction effect is improved, but the energy consumption increases
Solution Approach 1:
The controller extends engine operation time partially beyond the immediate stop request to achieve sufficient moisture reduction. By operating longer than strictly necessary for immediate shutdown, the system achieves the moisture reduction effect while the energy consumption increase is minimized and justified by preventing component wetting.
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 amount of water vapor in the exhaust passage after engine stoppage, preventing exhaust system component wetting and optimizing moisture release.
Implementation Method 1
In hydrogen engines that use hydrogen gas as fuel, a large amount of moisture is generated during combustion
Data Source
AI summary
A controller for a hydrogen engine is provided. Control circuitry performs, after a stop request for the hydrogen engine, a water reduction process that reduces a proportion of water vapor in exhaust gas. The control circuitry stops the hydrogen engine after operating the hydrogen engine with the water reduction process executed.