Automatic Calibration of Dual Fuel Engine Injection Timing
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Solution Overview
Problem
Dual fuel engines face inefficiencies due to variability in secondary fuels like natural gas, requiring time-consuming calibration to maintain optimal operation, leading to potential performance losses and increased costs.
Innovation Solution
A method and system where a controller monitors engine and cylinder parameters to adjust the start of injection timing dynamically, advancing or retarding it based on errors relative to predefined limits, ensuring efficient operation across varying fuel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual calibration is performed in laboratory to map acceptable gas substitution rates, then engine operating parameters can be maintained within hardware limits, but significant time is spent and possible losses in engine performance occur
Solution Approach 1:
The system performs self-calibration by automatically monitoring its own operating parameters (cylinder pressure, exhaust temperature, turbocharger speed) and adjusting fuel injection timing and quantity without external intervention. The controller continuously adapts the engine operation to maintain optimal performance while staying within hardware limits, eliminating the need for manual laboratory calibration.
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring operating parameters (cylinder pressure via sensor 142, exhaust temperature via sensor 150, turbocharger speed via sensor 140) and using this information to automatically adjust fuel injection timing and quantity. The controller compares actual parameters against predetermined limits and dynamically modifies injection events to maintain optimal operation, replacing time-consuming manual calibration processes.
2Reliability
If conservative calibration techniques are used to account for natural gas composition variability, then hardware limits are maintained, but engine performance losses occur
Solution Approach 1:
The system transitions from static conservative calibration to dynamic real-time adjustment. The controller continuously monitors operating parameters and dynamically adjusts fuel injection timing and quantity based on actual conditions. This allows the engine to operate closer to hardware limits safely, maximizing performance while adapting to variations in natural gas composition without requiring conservative margins.
Solution Approach 2:
The system automatically modifies critical operating parameters (fuel injection timing, injection quantity, gas substitution rate) in real-time based on monitored conditions. By dynamically changing these parameters rather than relying on fixed conservative calibration maps, the engine can maintain hardware limits while achieving optimal performance for varying fuel compositions.
3Reliability
If extensive laboratory calibration is performed to map acceptable gas substitution rates across operating range, then acceptable cylinder pressure and exhaust temperature are maintained, but cost and complexity increase
Solution Approach 1:
The engine system performs its own calibration by automatically monitoring operating parameters and adjusting fuel injection events without external laboratory equipment or expert intervention. The controller continuously adapts the system to maintain optimal operation, eliminating complex manual calibration procedures and reducing overall system complexity.
Solution Approach 2:
The system replaces complex manual calibration procedures with automated electronic control. Sensors (pressure sensor 142, temperature sensor 150, speed sensor 140) and an electronic controller work together to automatically adjust fuel injection timing and quantity, substituting manual mechanical calibration processes with automated electronic measurement and control systems.
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
This approach allows for automatic calibration and optimization of engine operation, maximizing efficiency and reducing costs by maintaining engine parameters within hardware limits, even with variable fuel quality.
Implementation Method 1
injecting a second fuel into the engine cylinder at a start of injection (SOI) timing
Implementation Method 2
A controller is disposed to receive the first signal and the second signal and operates to monitoring the global engine parameter and the cylinder-specific engine parameter
Implementation Method 3
the SOI timing with the controller for all engine cylinders is automatically advanced. When the local error indicates that the cylinder parameter is above the corresponding limit, the SOI timing for a particular cylinder is automatically retarded with the controller
Implementation Method 4
an engine operating to burn natural gas, the burning of which is initiated by a diesel pilot
Data Source
AI summary
A system and method for automatically calibrating an engine operating with a first fuel and a second fuel includes comparing each of a plurality of engine operating parameters with a corresponding limit, determining whether any of the plurality of engine operating parameters has exceeded its corresponding limit and, while none of the plurality of engine operating parameters has exceeded its corresponding limit, automatically and incrementally advance start of injection timing.