Jet Pump Fuel Supply System for Heavy-Duty Vehicles
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Solution Overview
Problem
Conventional fuel tank systems for heavy-duty vehicles with separate fuel tanks face challenges in seamlessly supplying fuel to a single engine, as the connection tube is not designed for continuous fuel transfer, preventing high flow rates and causing overflow issues.
Innovation Solution
A fuel supply system incorporating a jet pump that receives fuel from a secondary tank and returns it to a primary tank, with a shut-off valve to regulate flow and prevent overflow, allowing for efficient fuel distribution from both tanks to the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection tube is provided to establish fluid communication between the tanks for pressure balancing, then pressure balancing is achieved, but the connection tube is positioned above the fill limit level and is not designed for continuous fuel carrying capability, preventing high flow rate fuel transfer
Solution Approach 1:
The system segments the fuel transfer function from the pressure balancing function. The connection tube remains dedicated to pressure balancing while a separate jet pump system handles fuel transfer, allowing each component to be optimized for its specific function without compromise
Solution Approach 2:
The jet pump acts as an intermediary device between the two fuel tanks, enabling high flow rate fuel transfer without requiring the connection tube to be redesigned. The jet pump receives fuel from the first tank and delivers it to the second tank, bridging the functional gap
2Productivity
If a jet pump setup is used to constantly supply high flow rate fuel from the secondary tank to the primary tank, then high flow rate fuel supply is achieved, but excess or overflow fuel in the primary side cannot freely flow back to the secondary tank
Solution Approach 1:
The system dynamically adjusts fuel flow directions based on operational needs. The jet pump can operate in forward mode (primary to secondary) or reverse mode (secondary to primary), and the shut-off valve enables dynamic control of flow paths to prevent overflow and maintain system adaptability
Solution Approach 2:
The system incorporates feedback control through the shut-off valve that responds to fuel level conditions. When the primary tank reaches appropriate fuel levels, the valve prevents further inflow, and the system can reverse flow direction if needed, creating a self-regulating fuel management system
3Duration of action of stationary object
If fuel is pumped from the first fuel tank to drive a jet pump that returns fuel to the first tank, then continuous fuel circulation is achieved, but the jet pump return line requires flow regulation to prevent overflow
Solution Approach 1:
The jet pump system is self-regulating to a large extent. The shut-off valve provides automatic overflow prevention by closing when the primary tank reaches appropriate fuel levels, and the jet pump's suction side automatically draws fuel from the secondary tank when needed, reducing the need for complex external control mechanisms
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
The system ensures continuous fuel supply to the engine by regulating the flow rate between tanks, preventing overflow and maintaining consistent fuel levels, thereby optimizing fuel distribution from multiple tanks.
Implementation Method 1
A jet pump is configured to receive an auxiliary supply of fuel from the fuel pump and to return the auxiliary supply of fuel plus an additional flow of fuel drawn from a second fuel storage location to the first fuel storage location
Data Source
AI summary
A fuel supply system includes a fuel pump configured to pump fuel from a first fuel storage location to an engine. A jet pump is configured to receive an auxiliary supply of fuel from the fuel pump and to return the auxiliary supply of fuel plus an additional flow of fuel drawn from a second fuel storage location to the first fuel storage location. A jet pump supply line has an inlet in fluid communication with an outlet of the fuel pump and has an outlet coupled to an inlet of the jet pump. A jet pump return line has an input coupled to an outlet of the jet pump and has an outlet adjacent to the fuel pump. A shut-off valve operates to selectively limit fuel flow through the jet pump return line.