Generator Current Feedback for Engine Fuel Control
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Solution Overview
Problem
Existing engine control methods struggle to accurately adjust fuel delivery based on torque output, leading to inefficiencies and increased emissions, particularly during cold start conditions where the actual air/fuel ratio deviates significantly from the commanded ratio.
Innovation Solution
A method that measures current to/from a generator mechanically coupled with the engine to determine actual and expected torque outputs, allowing a controller to adjust fuel delivery based on a ratio of these torques, thereby maintaining optimal air/fuel ratios and minimizing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fuel control methods are used, then the engine can operate, but the air/fuel ratio deviates from commanded ratio leading to increased emissions
Solution Approach 1:
The system measures current to or from the generator, which is indicative of actual torque output. This measured torque feedback is used to adjust the amount of fuel provided to the engine, creating a closed-loop control system that maintains precise air/fuel ratio and reduces emissions
Solution Approach 2:
The patent replaces direct mechanical torque measurement with an electrical measurement approach. By measuring current to or from the generator (an electrical parameter) and using it as a proxy for torque output, the system avoids complex mechanical torque sensors while achieving precise fuel control
2Object-generated harmful factors
If fuel delivery is adjusted based on generator current, then emissions are reduced, but the system complexity increases
Solution Approach 1:
The generator serves multiple functions: it is both a power generation device and a torque measurement sensor. By measuring current to or from the generator, the system obtains torque information without adding separate measurement devices, thereby reducing overall system complexity while achieving emission reductions
Solution Approach 2:
The generator provides its own measurement capability through its current draw or output. The existing generator components are utilized for dual purposes (power generation and torque sensing), eliminating the need for additional dedicated sensors and simplifying the control system architecture
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 ensures precise fuel adjustment, reducing engine emissions and roughness by maintaining a narrow operational window around stoichiometric conditions, thereby optimizing engine performance and reducing emissions.
Implementation Method 1
measuring a current to or from a generator mechanically coupled with the engine
Data Source
AI summary
A method for operating an engine in a vehicle includes measuring a current to or from a generator mechanically coupled with the engine and determining at least one operating parameter of the engine. The method also includes providing an amount of fuel to the engine based on the current and the at least one operating parameter.