Fuel Pump Bracket Integrating Pressure Valves
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Solution Overview
Problem
Conventional fuel feed apparatuses face constraints in installation due to the limited positioning of pressure-retention and pressure-control valves, leading to a lack of commonality in mounting structures across different vehicle types, and often require modification based on the presence or absence of these valves.
Innovation Solution
A fuel feed apparatus with a pressure-control valve and a pressure-retention valve connected to a pump bracket, where the pressure-control valve controls fuel pressure to be equal to or less than a first pressure, and the pressure-retention valve maintains pressure at a second pressure less than the first, allowing for flexible valve placement and commonality in mounting structures across various vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pressure-retention valve and pressure-control valve are provided to specific pipes within the vehicle, then fuel pressure control function is achieved, but installation location is constrained and commonality across vehicle types cannot be achieved
Solution Approach 1:
The patent combines the pressure-retention valve and pressure-control valve into a single integrated assembly that is mounted on the fuel pump body. This merging of valve functions and their consolidation onto the pump bracket eliminates the need for separate pipe installations throughout the vehicle, thereby achieving universal applicability across different vehicle types while reducing installation complexity.
Solution Approach 2:
The fuel pump assembly is designed with multi-functionality by integrating both pressure-retention and pressure-control valves directly onto the pump bracket. This universal design allows the same fuel pump assembly to be installed in various vehicle configurations without modification, achieving adaptability across different vehicle types while maintaining proper fuel pressure control.
2Productivity
If fuel pump discharges fuel at high pressure, then fuel supply speed to engine is improved, but fuel pressure exceeds safety limit and causes harmful effects
Solution Approach 1:
The pressure-control valve provides continuous feedback control by monitoring fuel pressure in the discharge line and automatically diverting excess fuel back to the tank when pressure exceeds the predetermined threshold. This feedback mechanism ensures that fuel supply speed remains high during normal operation while preventing dangerous pressure buildup, thus eliminating the harmful effects of excessive pressure.
Solution Approach 2:
The pressure-control valve acts as an intermediary between the high-pressure fuel discharge system and the fuel tank. It mediates the pressure by providing a controlled relief path that redirects excess fuel flow, thereby protecting the system from harmful high-pressure effects while maintaining efficient fuel delivery to the engine during normal operation.
3Reliability
If pressure-retention valve blocks fuel passage to maintain pressure, then fuel pressure is maintained when pump stops, but fuel flow to jet pump is blocked
Solution Approach 1:
The pressure-retention valve is designed with dynamic characteristics that allow it to respond to pressure changes in real-time. When the fuel pump stops and pressure drops below the retention threshold, the valve automatically opens to allow fuel flow to the jet pump. When pressure exceeds the threshold during pump operation, the valve closes to maintain pressure. This dynamic response ensures both reliable pressure maintenance and uninterrupted fuel flow when needed.
Solution Approach 2:
The pressure-retention valve operates autonomously based on the pressure conditions in the fuel passage, without requiring external control signals. It self-regulates by opening or closing according to the instantaneous pressure state, thereby maintaining pressure when the pump stops while automatically allowing fuel flow to the jet pump when pressure conditions require it, ensuring continuous system functionality.
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 efficient fuel supply to internal combustion engines, reduces installation constraints, and allows for commonality in fuel feed apparatus designs across different vehicle types by decoupling valve placement from specific pipe locations.
Implementation Method 1
a jet pump for generating suction pressure by jetting fuel, which is discharged from the fuel pump, partially through a nozzle
Data Source
AI summary
A fuel feed apparatus includes a fuel pump for pumping fuel from a fuel tank to an internal combustion engine. A pressure-control valve controls pressure of fuel, which is discharged from the fuel pump, to be equal to or less than a first pressure. A jet pump generates suction pressure by jetting fuel, which is discharged from the fuel pump, partially through a nozzle. A pressure-retention valve is provided in an upstream of the jet pump with respect to fuel flow from the fuel pump for maintaining pressure of fuel in the upstream at a second pressure, which is less than the first pressure. A pump bracket holds the fuel pump. The pressure-control valve and the pressure-retention valve are connected to the pump bracket.