Outboard Motor Fuel Supply Device Preventing Catalyst Overheating
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Solution Overview
Problem
Outboard motors with catalyst members in the exhaust pipe can overheat due to uncombusted gases combusting when the air/fuel ratio becomes too lean, leading to engine misfires and catalyst overheating.
Innovation Solution
A fuel supply device with a fuel injection system, internal and external tanks, pipes, pumps, and a control unit that detects fuel quantity and adjusts engine operation to prevent catalyst overheating by reducing engine rotations when fuel is low, ensuring sufficient fuel supply and maintaining a safe air/fuel ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If fuel is supplied from an external tank to an internal tank and then to the fuel injection device, then the fuel supply system can operate continuously, but the catalyst member may overheat when fuel supply becomes insufficient
Solution Approach 1:
The control device performs preliminary action by detecting fuel supply quantity before fuel exhaustion occurs and controlling the engine rotation in advance to prevent catalyst overheating. When the fuel supply quantity detection device detects that fuel supply is insufficient, the control device reduces engine rotation before the internal tank is completely empty, thereby preventing uncombusted gas from igniting in the exhaust pipe and overheating the catalyst member.
2Stability of the object's composition
If the internal tank is used to temporarily store fuel, then fuel supply stability is improved, but engine misfire occurs when the internal tank runs out of fuel
Solution Approach 1:
The control device uses feedback from the fuel supply quantity detection device to monitor fuel supply status in real-time. When the detection device indicates insufficient fuel supply, the control device responds by controlling engine rotation to prevent misfire. This closed-loop feedback system ensures that the engine operates reliably by adjusting rotation based on actual fuel availability, preventing the air/fuel ratio from becoming too lean.
3Use of energy by moving object
If the fuel injection device injects fuel into the engine, then combustion efficiency is improved, but uncombusted gas ignites in the exhaust pipe when fuel is insufficient
Solution Approach 1:
The control device applies preliminary anti-action by reducing engine rotation before fuel exhaustion occurs. When the fuel supply quantity detection device detects insufficient fuel supply, the control device proactively controls engine rotation to prevent the air/fuel ratio from becoming too lean, thereby preventing uncombusted gas from igniting in the exhaust pipe and damaging the catalyst member.
Data Source
AI summary
A fuel supply device that supplies fuel from an external tank to an engine includes a fuel injection, an internal tank, a first pipe, a second pipe, a first pump, a fuel supply quantity detection device, and a control device. The internal tank stores fuel to be delivered to the fuel injection device. The first pipe is linked to the internal tank and delivers fuel from the external tank to the internal tank. The second pipe is linked to the fuel injection device and delivers fuel from the internal tank to the fuel injection device. The fuel supply quantity detection device is attached to the first pipe and detects a quantity of fuel supplied from the external tank via the first pipe to the internal tank. The control device implements a predetermined control when the quantity of fuel detected by the fuel supply quantity detection device is below a threshold.