Integrated High Pressure Pump for PFI and GDI Fuel Systems
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Solution Overview
Problem
The complexity of designing both low pressure and high pressure fuel supply lines in fuel systems for complex injection engines, where port fuel injection (PFI) and gasoline direct injection (GDI) are combined, leads to intricate designs and increased complexity.
Innovation Solution
Incorporating a low pressure fuel supply line within a high pressure pump to simplify the design of fuel supply lines, which includes a pressure unit, damper, flow control valve, and outlets to manage fuel flow and pressure, allowing for the integration of both low and high pressure fuel systems in a unified pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both low pressure fuel supply line and high pressure fuel supply line are designed separately, then fuel supply functionality is complete, but device complexity increases
Solution Approach 1:
The patent merges the low pressure fuel supply line and high pressure fuel supply line into a single integrated fuel pump unit. The fuel pump body contains both low pressure fuel supply passages and high pressure fuel supply passages, allowing one component to serve dual purposes for both PFI and GDI fuel delivery systems, thereby reducing overall system complexity
Solution Approach 2:
The fuel pump is designed with multi-functionality to handle both low pressure fuel supply for PFI injection and high pressure fuel supply for GDI injection. The pump includes a fuel tank, low pressure fuel supply passages, high pressure fuel supply passages, and respective outlets, enabling a single device to perform multiple fuel delivery functions that would traditionally require separate dedicated systems
2Adaptability or versatility
If separate low pressure and high pressure fuel supply lines are used, then fuel delivery requirements are met, but ease of manufacture decreases
Solution Approach 1:
By combining both fuel supply lines into one integrated pump unit with a single fuel tank and unified pump body, the manufacturing process is simplified. Instead of producing and assembling separate low pressure and high pressure supply lines, the patent creates one manufactured unit that includes all necessary passages and outlets, reducing assembly steps and manufacturing complexity
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 simplifies the design and implementation of fuel supply lines in complex injection engines by integrating the low pressure fuel supply line into the high pressure pump, reducing complexity and enhancing the efficiency of fuel delivery.
Implementation Method 1
a pressure unit that applies pressure to low pressure fuel flowing in from a low pressure fuel inlet to generate high pressure fuel
Implementation Method 2
a damper that dampens a pulsation generated when applying the pressure to the low pressure fuel
Data Source
AI summary
A high pressure pump for complex injection engines is provided. A body of the high pressure pump includes a first flow path that transports the low pressure fuel flowing in through the low pressure fuel inlet and a low pressure fuel storage chamber that is disposed in a lower portion of the body to store the low pressure fuel transported from the first flow path. A second flow path transports the low pressure fuel stored in the low pressure fuel storage chamber and a flow control valve is disposed over the low pressure fuel storage chamber to discharge the low pressure fuel, transported through the second flow path, to the pressure unit or the damper disposed in an upper portion of the body based on an opening or closing operation. A low pressure fuel outlet discharges the low pressure fuel, transported through the damper, to a low pressure fuel rail.