Dual-Tank Fuel System Temperature Control via Segmentation
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Solution Overview
Problem
Current fuel systems for combustion engines face challenges in reducing fuel consumption and minimizing the risk of damage due to hot returned fuel, which can lead to overheating and paraffination, affecting the engine and fuel system components.
Innovation Solution
A fuel system with a dual-tank configuration, where a smaller 'technology tank' is connected to a main tank via a main feed pump driven by an electric motor, and a transfer pump, allowing for controlled temperature management by directing fuel flow from either tank to regulate temperature and prevent overheating, using a valve or thermostat to divert hot fuel back to the main tank if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot pressurized fuel is returned to the fuel tank to protect the combustion engine and injection system, then the risk of paraffination is reduced, but the fuel in the fuel tank becomes too warm which can affect parts of the fuel system negatively
Solution Approach 1:
The fuel tank system is divided into two separate tanks: a main fuel tank for bulk storage and a technology tank for controlled fuel management. This segmentation allows hot returned fuel to be directed to the technology tank rather than the main tank, preventing overheating of the main fuel storage while still utilizing the heat for beneficial purposes.
Solution Approach 2:
The technology tank acts as an intermediary between the fuel return line and the main fuel tank. It receives hot pressurized fuel from the combustion engine, allows it to cool down, and then supplies cooled fuel to the main tank or directly to the injection system, thus mediating the temperature issue.
2Reliability
If a technology tank with smaller volume than main tanks is used to facilitate starting, then cold fuel availability is improved, but the system complexity increases
Solution Approach 1:
The technology tank serves multiple functions: it facilitates cold starting by providing access to cold fuel, acts as a temperature buffer for hot returned fuel, and can supply fuel directly to the injection system. This multi-functionality justifies the additional component by providing several benefits from a single addition.
Solution Approach 2:
The system includes dynamic control elements such as a control unit and actuators that can redirect fuel flow between the main tank and technology tank based on operating conditions. This dynamic capability allows the system to adapt to different scenarios (cold start, normal operation, overheating) without requiring completely different system configurations.
3Temperature
If multiple fuel tanks are used for temperature control, then fuel temperature management is improved, but the device complexity increases
Solution Approach 1:
Different regions of the fuel system have different temperature characteristics: the main fuel tank maintains ambient temperature for bulk storage, while the technology tank experiences temperature variations from hot fuel returns. This local quality differentiation allows each tank to serve its specific purpose optimally.
Solution Approach 2:
The control unit monitors temperature conditions and fuel levels in both tanks, using this feedback information to make intelligent decisions about fuel transfer and return routing. This feedback mechanism automates temperature management, reducing the need for complex manual control systems.
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 configuration enables flexible control of fuel supply, reduces parasitic losses, and minimizes the risk of damage to the combustion engine and fuel system components by maintaining optimal fuel temperatures, thus enhancing fuel efficiency and system reliability.
Implementation Method 1
a main feed pump that feeds fuel from the first fuel tank
Implementation Method 2
a transfer pump that feeds fuel from the second fuel tank to the first fuel tank
Implementation Method 3
a fuel return line that returns pressurized fuel from the high-pressure system to the first fuel tank
Implementation Method 4
a first electric motor that drives the main feed pump
Data Source
Figure 1
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AI summary
The invention concerns a fuel system (4) that comprises a first fuel tank (20) and a second fuel tank (22). The fuel is conducted from the first fuel tank (20) to a high-pressure system (19). A main feed pump (26) feeds fuel from the first fuel tank (20) via a second line (40) and a transfer pump (28) feeds fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36). A first electric motor (M1) drives the main feed pump (26), and is arranged in the first fuel tank (20). The first fuel tank (20) holds a smaller volume than the second fuel tank (22). A fuel return line (13) is arranged so as to return pressurized fuel from the high-pressure system (19) to the first fuel tank (20). The fuel system (4) further comprises an arrangement for controlling the fuel temperature in the first fuel tank (20) by controlling the flow of fuel to the first fuel tank (20). The invention also concerns a combustion engine (20) and a vehicle (1) that contains the system, and a method for controlling a fuel system (4).