Intermittent Fuel Pump Control for Marine Engine Starting
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Solution Overview
Problem
Marine propulsion systems with unvented fuel supply modules face issues of continuous pump operation, leading to excessive electrical load and potential battery charging inefficiencies, which can result in hard starting or non-starting engines due to high current draw, especially at low speeds.
Innovation Solution
A system and method that intermittently operate the first pump to minimize electrical power consumption and maintain a minimum fuel level in the reservoir, using a control circuit to manage pump operation based on predetermined time periods and fuel thresholds, ensuring efficient fuel supply while reducing electrical load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first pump operates continuously to fill the fuel reservoir, then the fuel supply is maintained, but excessive electrical power is consumed and pump wear increases
Solution Approach 1:
The first pump operates intermittently rather than continuously, with the control circuit activating it only when the fuel level in the reservoir falls below a threshold amount. This periodic operation maintains fuel supply reliability while significantly reducing electrical power consumption and pump wear.
Solution Approach 2:
The system uses a feedback mechanism where the control circuit monitors the fuel level in the reservoir (either directly or through engine fuel consumption data) and activates the first pump only when the fuel level drops below a predetermined threshold, optimizing power usage while ensuring continuous fuel availability.
2Reliability
If the first pump operates continuously, then fuel supply is ensured, but electrical load increases causing hard starting or non-starting engines at low speeds
Solution Approach 1:
The pump operates periodically rather than continuously, with the control circuit enabling it only when fuel level thresholds are not met. This reduces the overall electrical load on the system, preventing starting issues at low speeds while ensuring fuel supply is maintained when needed.
3Reliability
If the pump operates continuously, then fuel reservoir is always full, but pump wear increases and service life decreases
Solution Approach 1:
The first pump operates periodically based on fuel level thresholds rather than continuously. The control circuit activates the pump only when the fuel level falls below a predetermined threshold, which maintains adequate fuel supply while significantly reducing pump operating hours, wear, and extending service life.
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 reduces electrical power consumption, decreases pump wear, and enhances engine starting reliability by managing fuel supply efficiently, particularly at low speeds, thereby improving overall system performance and extending pump life.
Implementation Method 1
a first pump that pumps fuel from a supply tank into the fuel reservoir
Data Source
AI summary
A system for providing fuel to an internal combustion engine comprises a fuel reservoir for containing fuel for use by the internal combustion engine; a first pump that pumps fuel from a supply tank into the fuel reservoir; and a battery that provides electrical power to the first pump. A control circuit sends signals to selectively run the first pump so as both to minimize a total amount of electrical power consumed by the system and to maintain at least a minimum amount of fuel in the reservoir. Methods for filling a fuel reservoir that contains fuel for use by an internal combustion engine are also provided.