Engine Fuel Supply Control Strategy for Deceleration Events
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Solution Overview
Problem
Combustion engines face challenges in maintaining optimal air/fuel ratios due to varying operating conditions, such as load, altitude, and engine component differences, which can lead to inefficient engine operation and performance issues.
Innovation Solution
A method that determines engine deceleration events and adjusts the air/fuel mixture by comparing engine revolutions against thresholds, using an electrically actuated valve to make the mixture richer or leaner based on deceleration characteristics, ensuring optimal fuel efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air/fuel ratio is calibrated for a particular engine, then the engine operates optimally under specific conditions, but performance deteriorates when operating conditions vary (load, acceleration, deceleration, altitude, fuel type, filter condition, engine differences)
Solution Approach 1:
The patent implements dynamic adjustment of the air/fuel ratio based on real-time engine operating conditions. The system continuously monitors parameters such as engine speed, load, acceleration, and deceleration rates, then dynamically modifies fuel delivery through electrically actuated valves to maintain optimal combustion across varying conditions, resolving the contradiction between fixed calibration stability and adaptive performance
Solution Approach 2:
The system employs feedback mechanisms by monitoring engine performance parameters and using this information to adjust the air/fuel ratio. The controller receives data about actual engine operation and compares it against optimal values, then makes real-time adjustments to fuel delivery, enabling the system to adapt to changing conditions while maintaining reliable operation
2Productivity
If real-time adjustment of air/fuel ratio is implemented, then engine efficiency and performance are improved, but device complexity increases
Solution Approach 1:
The patent changes the operational parameters of existing components rather than introducing fundamentally new systems. It adjusts the timing and duration of valve actuation, modifies fuel delivery rates, and varies air intake characteristics based on operating conditions. This approach achieves real-time optimization while utilizing modified versions of conventional engine components, thereby limiting the increase in overall system complexity
Data Source
AI summary
In at least some implementations, a method of controlling a fuel-to-air ratio of a fuel and air mixture supplied to an engine, includes the steps of determining an engine deceleration event, determining the number of engine revolutions required for the engine speed to decrease from one speed threshold to another speed threshold, comparing the number of engine revolutions determined above against a revolution threshold, and making the fuel and air mixture richer if the number of engine revolutions determined above is greater than the revolution threshold. The method may also include determining if, before the engine stabilized at a stable engine speed (which may be an engine idle speed), the engine speed decreased below the stable engine speed as the engine decelerated to the stable engine speed from a speed above the stable engine speed, and making the fuel and air mixture leaner if the determination is affirmative.