Engine Speed Control Using Fuel Energy Feedback
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Solution Overview
Problem
Existing speed control systems for internal combustion engines are not adaptable to use multiple fuels and struggle with dynamic response, particularly when switching between different fuel types, due to reliance on external clutching signals and fixed controller parameters.
Innovation Solution
A closed-loop speed control system that uses total fuel energy as the correcting variable, with controller parameters adjusted based on internally available signals like engine speed and fuel energy, allowing for dynamic proportional coefficient calculation and improved response through load signal integration, enabling operation with multiple fuels like diesel and gasoline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external clutching signals are used to switch controller parameters, then the speed control can be adjusted during clutch engagement, but the system cannot operate with multiple fuel types and requires additional external signals
Solution Approach 1:
The controller automatically detects fuel type based on internally available signals (engine speed, fuel energy, speed control deviation) and self-adjusts controller parameters without requiring external clutching signals or manual intervention. The system serves itself by using its own operational data to determine the appropriate fuel type and adjust parameters accordingly.
Solution Approach 2:
The controller parameters are dynamically changed based on detected fuel type. The system monitors internally available signals and automatically adjusts the controller behavior to match the specific fuel being used, enabling seamless operation with different fuel types without external signal intervention.
2Speed
If fixed controller parameters are used, then the control system is simple to implement, but the dynamic response is poor especially when switching between fuel types
Solution Approach 1:
The controller parameters are made dynamic rather than fixed. The system continuously monitors internally available signals and automatically adjusts controller parameters in real-time based on the detected fuel type and operating conditions, enabling fast dynamic response without requiring external switching signals.
Solution Approach 2:
The controller uses feedback from internally available signals (engine speed, fuel energy, speed control deviation) to automatically adjust its parameters. This closed-loop approach enables the system to adapt its dynamic response characteristics based on the actual fuel type being used, improving performance without external intervention.
3Adaptability or versatility
If the correcting variable is set to injection quantity, then the speed control is straightforward, but the system cannot accommodate multiple fuels with different energy contents
Solution Approach 1:
The system introduces fuel energy as an intermediary variable between the injection quantity and the speed control objective. By using fuel energy (which accounts for the energy content of different fuel types) as the correcting variable, the controller can properly compensate for differences in fuel energy density while maintaining straightforward speed control functionality.
Solution Approach 2:
The correcting variable is changed from injection quantity to fuel energy. This parameter change enables the system to account for different fuel types with varying energy contents, as fuel energy inherently captures the energy density differences between fuels like diesel and gasoline, allowing proper speed control adaptation.
4Ease of operation
If controller parameters are switched based on external signals, then the control can adapt to operational changes, but the system loses independence and requires additional external signal infrastructure
Solution Approach 1:
The controller performs automatic fuel type detection and parameter adjustment using only its own internally available signals. The system is self-sufficient and does not require external clutching signals or additional external signal infrastructure, maintaining operational independence while achieving automatic adaptation to different fuel types.
Data Source
AI summary
A method for controlling the speed of an internal combustion engine and a speed control circuit for carrying out the method. For controlling, fuel energy is used as an output variable. The control units are calculated in accordance with a stationary proportion gain which is calculated proportionally to the fuel energy and inversely proportional to the engine speed.