Gaseous Fuel Engine Derating via Intake Manifold Pressure Control
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Solution Overview
Problem
Conventional derating strategies for internal combustion engines often overcompensate by reducing engine load more than necessary to prevent detonation, leading to prolonged operation at suboptimal levels and slow recovery once detonation subsides.
Innovation Solution
A method and system that determine the detonation level in combustion cylinders, calculate a detonation error, and adjust the engine intake manifold air pressure to limit the engine load to a derated level, allowing for more precise control and rapid recovery from detonation events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional derating strategies reduce engine load to prevent detonation, then detonation is mitigated, but engine load is reduced more than necessary leading to prolonged operation at suboptimal levels
Solution Approach 1:
The system continuously monitors detonation levels and dynamically adjusts engine load accordingly. When detonation is detected, the control system reduces engine load to a derated level, and when detonation subsides, the system rapidly increases load back to desired levels. This closed-loop feedback mechanism prevents both over-derating and prolonged suboptimal operation.
Solution Approach 2:
The derating strategy transitions from static, predetermined load reduction to dynamic, real-time load adjustment based on actual detonation conditions. The system continuously adapts engine load to match current combustion conditions, enabling rapid recovery once detonation ceases rather than maintaining fixed conservative derated levels.
2Reliability
If conventional derating strategies reduce engine load to prevent detonation, then detonation is mitigated, but recovery to desired load levels is slow
Solution Approach 1:
The control system continuously monitors detonation levels and uses this feedback to determine when it is safe to increase engine load. Once detonation subsides below threshold levels, the system rapidly increases load back to desired operating levels, minimizing recovery time while maintaining protection against detonation recurrence.
Solution Approach 2:
The system enables rapid transition from derated load levels back to full operating capacity once detonation conditions resolve. Rather than gradually increasing load over an extended period, the control system quickly restores desired load levels, effectively skipping through the intermediate recovery phase to minimize time loss.
3Reliability
If conventional derating strategies reduce engine load considerably below safe levels, then detonation is prevented, but engine efficiency is reduced
Solution Approach 1:
The system dynamically adjusts engine load to match actual detonation conditions rather than operating at fixed conservative derated levels. When detonation is present, load is reduced to prevent damage; when detonation subsides, load is rapidly increased to maintain optimal efficiency. This dynamic approach ensures engine operates at highest possible efficiency while maintaining protection.
Solution Approach 2:
The control system changes the engine load parameter in real-time based on detected detonation levels. Rather than maintaining a statically reduced load parameter, the system continuously adjusts the load parameter to reflect current combustion conditions, enabling the engine to operate at optimal efficiency levels whenever detonation risk is low while maintaining protection when risk is high.
Data Source
AI summary
Operating a gaseous fuel engine system includes determining a detonation level in combustion cylinders in an engine in the gaseous fuel engine system, comparing the detonation level to a detonation level limit, calculating a detonation error, and limiting an engine load of the engine to a derated engine load level based on a reduction to intake manifold air pressure (IMAP) that is performed responsive to the detonation error. The gaseous fuel engine system can be operated at a reduced, derated engine load, rather than being shut down, and permitted to increase in engine load level as detonation events clear. Related control logic and structure are disclosed.