Outboard Motor Fuel Controller Deceleration Stability
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Solution Overview
Problem
Conventional outboard motor fuel controllers rely solely on engine speed for fuel reduction during deceleration, leading to instability in engine speed due to variations in deceleration manners specific to boats, resulting in either excessive or insufficient fuel feed.
Innovation Solution
An outboard motor fuel controller that determines deceleration using a deceleration determining section, detects engine speed and load, and calculates a compensation factor to optimize fuel feed, ensuring smooth and accurate deceleration by presetting initial fuel compensation values and performing dividing calculations at intervals to adjust fuel amounts based on detected conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel amount is controlled according to only engine speed during deceleration, then the control system is simple, but the engine speed becomes unstable due to variations in deceleration manners
Solution Approach 1:
The patent segments the fuel control system into multiple independent detection components: engine speed detection, engine load detection, and deceleration determination. Each component independently monitors a specific parameter, and their combined information enables stable fuel control during deceleration without excessive system complexity.
Solution Approach 2:
The patent performs preliminary determination of deceleration state and engine load conditions before adjusting fuel amount. By pre-identifying the deceleration phase and load level, the system can proactively adjust fuel compensation amounts to prevent engine speed instability rather than reacting after instability occurs.
2Speed
If fuel compensation amount is adjusted rapidly during deceleration, then deceleration response is fast, but fuel control becomes inaccurate leading to instability
Solution Approach 1:
The patent implements dynamic fuel control by continuously adjusting the fuel compensation amount based on real-time engine speed and load conditions during deceleration. The controller dynamically recalculates the appropriate fuel reduction percentage at each control cycle, enabling both rapid response to deceleration and precise fuel management to maintain stability.
Solution Approach 2:
The patent changes multiple control parameters simultaneously during deceleration: engine speed threshold for deceleration detection, engine load percentage for compensation calculation, and fuel injection amount. By coordinating changes in these parameters, the system achieves both fast deceleration response and accurate fuel control precision.
3Loss of energy
If fuel feed amount is reduced too much during deceleration, then fuel economy improves, but engine speed becomes unstable
Solution Approach 1:
The patent employs feedback control by continuously monitoring engine speed and load during deceleration and using this information to adjust fuel compensation amounts. The system calculates the actual engine load percentage and uses it as feedback to determine the appropriate fuel reduction level, preventing excessive fuel cuts that would cause instability while still improving fuel economy.
Solution Approach 2:
The patent performs preliminary calculation of the appropriate fuel compensation amount based on detected engine load conditions before actually reducing fuel feed. By pre-determining the optimal fuel reduction percentage based on current load, the system ensures fuel economy improvement while maintaining enough fuel to prevent engine speed instability.
Data Source
AI summary
To enable smooth, highly accurate deceleration in various usage conditions of an outboard motor and realize stabilized engine speed after deceleration, a fuel controller for controlling the amount of fuel fed to an engine of an outboard motor mounted on a boat includes a deceleration determining section arranged to determine deceleration of the boat, an engine speed detecting section arranged to detect the engine speed of the engine, an engine load detecting section arranged to detect the load on the engine, and a controller arranged to control the amount of fuel fed to the engine when the boat is in deceleration according to the detected engine speed and engine load.