Additive Dispensing Device with Mobile Fluidtight Wall
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Solution Overview
Problem
Existing systems for dispensing additives into internal combustion engine fuel circulation circuits require large reservoirs and complex electronic control systems, leading to increased weight, fuel consumption, and maintenance challenges, particularly in regions where consistent additive supply is uncertain.
Innovation Solution
A device with a flexible pouch or membrane acting as a mobile and fluidtight wall between the additive reservoir and the fuel circulation circuit, allowing for precise additive release without significant pressure variation, integrated into the fuel tank or distribution lines, enabling compact and controlled additive distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large reservoirs (2-3 liters) are used to hold additive supply, then sufficient additive is available for PF regeneration, but the device weight and fuel consumption increase
Solution Approach 1:
The additive reservoir is divided into two separate chambers: a first chamber containing the additive and a second chamber containing fuel. This segmentation allows the additive to be transported in a compact form without requiring a large single reservoir, thereby reducing weight while maintaining sufficient additive supply for PF regeneration.
Solution Approach 2:
The additive reservoir is integrated within the fuel tank structure, with the first chamber positioned inside the fuel tank and the second chamber forming part of the fuel circulation circuit. This nesting approach eliminates the need for separate external reservoirs, reducing overall device weight and space requirements.
2Measurement precision
If high precision dosing pumps are used to control additive injection, then accurate additive concentration is maintained in fuel, but the device complexity and cost increase
Solution Approach 1:
The system uses the natural mixing properties of the fuel circulation circuit to achieve uniform additive distribution. The additive is introduced into the fuel stream through the first chamber, and the existing fuel pump and circulation system automatically mix and distribute the additive throughout the fuel system, eliminating the need for complex external dosing pumps and control electronics.
Solution Approach 2:
The fuel circulation system performs multiple functions: it transports fuel to the engine, mixes the additive with fuel through the first chamber, and distributes the combined fuel-additive mixture throughout the system. This multi-functionality eliminates the need for separate dedicated dosing equipment, reducing device complexity.
3Extent of automation
If additional ECU control units are added to manage dosing, then additive injection is precisely controlled, but the system becomes more complex and maintenance-difficult
Solution Approach 1:
The system leverages the existing ECU's control of the fuel pump and injection system to indirectly control additive distribution. The ECU manages fuel flow rates and injection timing, which naturally regulates additive introduction into the fuel stream, eliminating the need for separate ECU control units dedicated to additive dosing.
Solution Approach 2:
The control functions for fuel management and additive distribution are merged into a single integrated system. The existing ECU control logic is extended to manage the first chamber additive introduction points, combining multiple control functions into one unified control architecture, thereby reducing overall system complexity.
4Ease of manufacture
If the additive reservoir is filled through external connectors, then refilling is possible, but the process is difficult and unreliable in developing regions
Solution Approach 1:
The additive reservoir is pre-filled during manufacturing under controlled conditions, and the first chamber is designed with a fixed volume that can be accurately replicated. This preliminary action eliminates the need for field refilling operations, ensuring consistent additive supply throughout the vehicle's service life without requiring complex filling connectors or procedures.
Solution Approach 2:
The first chamber additive reservoir is designed as a disposable or limited-life component with a fixed volume. Once the additive is consumed, the entire first chamber can be replaced as a single unit, eliminating the need for complex refilling infrastructure and connectors. This approach simplifies operation in regions with limited technical support resources.
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
Enables precise and controlled release of additives, reducing weight and maintenance complexity while maintaining consistent additive concentration, suitable for various additive types and compositions, and adaptable to different engine technologies.
Implementation Method 1
maintains equal pressure between the additive in the additive reservoir and the fuel in the additive chamber
Implementation Method 2
at least one mobile and fluidtight wall between said additive chamber and the additive reservoir which, on the one hand, provides a fluidtight division, and on the other hand, maintains equal pressure
Data Source
AI summary
The invention relates to a device for dispensing a liquid additive into a fuel circulation circuit for an internal combustion engine, comprising a reservoir (12) of liquid additive allowing an additive to be distributed into the fuel circulation circuit by means of a distribution line (16), characterized in that it comprises an additive chamber (22) in communication with the fuel circulation circuit and at least one wall (32) that is mobile and fluidtight between said additive chamber and the additive reservoir which, on the one hand, provides a fluidtight division and, on the other hand, maintains equal pressure between the additive in the additive reservoir and the fuel in the additive chamber.