Multi-Fuel Engine Control System for Degradation Detection
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Solution Overview
Problem
Existing engine systems fail to effectively account for degradation in fuel delivery systems over time, leading to performance issues and potential emissions problems, particularly in multi-fuel capable engines used in stationary power plants and vehicles.
Innovation Solution
A system comprising a liquid fuel system, a gaseous fuel system, and a control system that delivers both fuels over a range of engine operating points and performs tests to indicate degradation in the gaseous fuel system, ensuring optimal performance and minimizing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine operates over time without monitoring, then operational simplicity is maintained, but fuel system degradation occurs leading to performance deterioration
Solution Approach 1:
The control system performs preliminary testing of the gaseous fuel system at designated intervals before degradation affects engine performance. By proactively identifying degradation early through controlled fuel delivery and monitoring at various operating points, the system can maintain reliability without requiring continuous complex monitoring throughout all operational conditions.
Solution Approach 2:
The control system monitors engine output parameters (such as power, torque, or exhaust characteristics) and uses this feedback to detect changes in fuel system performance. By comparing current engine output against expected values and identifying deviations that indicate degradation, the system maintains fuel system reliability through continuous, simple feedback monitoring rather than complex proactive testing.
2Object-generated harmful factors
If fuel delivery systems are not tested regularly, then system simplicity is maintained, but emissions problems arise due to degraded performance
Solution Approach 1:
The control system performs preliminary fuel system testing at predetermined intervals or under specific conditions before emissions problems develop. By conducting controlled tests at various engine operating points and comparing actual fuel delivery against expected performance, the system can identify and address degradation early, preventing emissions problems without requiring continuous extensive testing.
Solution Approach 2:
The control system varies operating parameters (such as engine load, fuel type ratio, or temperature) during testing to stress different components of the fuel system. By conducting tests across a range of operating conditions rather than at a single point, the system can comprehensively assess fuel delivery performance and detect degradation that would lead to emissions problems, while limiting testing time through targeted parameter variation.
3Ease of operation
If the system operates at a fixed fuel delivery rate, then operational simplicity is maintained, but performance deteriorates due to unaccounted system degradation
Solution Approach 1:
The control system dynamically adjusts fuel delivery rates based on detected system performance and operating conditions. Rather than maintaining a fixed delivery rate, the system monitors engine output and fuel system response, then modifies fuel delivery to compensate for degradation. This dynamic adjustment maintains engine performance reliability while keeping the control logic simple through condition-based adjustments rather than continuous complex optimization.
Solution Approach 2:
The control system continuously monitors engine output parameters and uses this feedback to detect changes in fuel delivery system performance. By comparing actual engine response against expected values and adjusting fuel delivery accordingly, the system maintains optimal performance despite degradation. The feedback mechanism keeps control simple by using direct engine output measurements rather than complex predictive models.
Data Source
AI summary
Various methods and systems are provided for a multi-fuel capable engine. The system includes a liquid fuel system to deliver liquid fuel to an engine, a gaseous fuel system to deliver gaseous fuel to the engine, and a control system. The control system, during a gaseous fuel system test mode, controls the liquid fuel system and the gaseous fuel system to deliver the liquid fuel and the gaseous fuel to the engine over a range of engine operating points, and indicate degradation of the gaseous fuel system based on engine output at each of the engine operating points.