Hydrogen Engine Controller Pre-Ignition Backflow Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In internal combustion engines that use hydrogen as fuel, pre-ignition occurs frequently, leading to excessive in-cylinder pressure and potential damage to the fuel injection valve, as cooling the cylinder using fuel latent heat is ineffective.
Innovation Solution
A controller for the internal combustion engine that adjusts the fuel injection amount in subsequent cycles based on the backflow amount of combustion gas due to pre-ignition, reducing the fuel injection amount when the backflow is relatively small to prevent further pre-ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel injection amount is reduced in subsequent cycles, then the likelihood of pre-ignition is reduced, but the engine output and efficiency deteriorate
Solution Approach 1:
The fuel injection amount is dynamically adjusted based on the detected backflow amount. When pre-ignition occurs and combustion gas backflow is detected, the injection amount is reduced in subsequent cycles to prevent further pre-ignition. When no pre-ignition occurs, normal injection amounts are maintained, ensuring engine efficiency and output are preserved.
Solution Approach 2:
The control strategy changes the fuel injection parameter (injection amount) based on the detected backflow condition. By modifying this key parameter responsive to pre-ignition events, the system prevents pre-ignition while minimizing impact on overall engine performance through conditional rather than continuous reduction.
2Strength
If the fuel injection amount is reduced in subsequent cycles, then damage to the fuel injection valve is reduced, but the fuel consumption increases
Solution Approach 1:
The injection amount is dynamically adjusted only when pre-ignition is detected and backflow occurs. This temporary, conditional reduction protects the fuel injection valve from damage by hot combustion gases while minimizing fuel consumption impact by returning to normal injection levels in subsequent cycles when pre-ignition does not occur.
Solution Approach 2:
The control strategy applies a preventive measure by reducing fuel injection in the cycle following pre-ignition. This cushions against potential valve damage by preventing further pre-ignition events that would expose the valve to extreme temperatures, while the temporary nature of the reduction minimizes overall fuel consumption impact.
Data Source
AI summary
Processing circuitry controls a fuel injection amount of a direct injection valve provided in an internal combustion engine that uses hydrogen as fuel. An amount of combustion gas that flows back into the direct injection valve due to occurrence of pre-ignition is defined as a backflow amount. A single combustion cycle starting from a cylinder where fuel injection is performed subsequent to a cylinder where the pre-ignition has occurred is referred to as a subsequent cycle. The processing circuitry is configured to execute a process that reduces the fuel injection amount in the subsequent cycle when the backflow amount is relatively small compared with when the backflow amount is relatively large.