High-Pressure Fuel Pump Cooling via Feed Pipe Conduction
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Solution Overview
Problem
Existing internal combustion engine designs face challenges in cooling the high-pressure fuel pump effectively, particularly when operating in low load zones, leading to potential heat-up and faulty operations due to the lack of a simple structure that allows for efficient fuel cooling and heat dissipation.
Innovation Solution
The design incorporates a high heat conductivity feed pipe that branches fuel from the fuel tank to both the cylinder inside fuel injection valve and the intake passage fuel injection valve, with a projected part extending to the base for enhanced heat transmission and cooling, allowing the high-pressure fuel pump to be cooled even in MPI mode, and enabling common usage across different engine modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the high pressure fuel pump is provided with a fuel outlet and fuel passage for feeding low pressure fuel to the intake passage fuel injection valve, then the high pressure fuel pump can be cooled with the fuel, but the structure of the housing becomes more complex and component commonality is reduced
Solution Approach 1:
The feed pipe is designed to serve multiple functions: it introduces fuel to the high pressure fuel pump, cools the pump through thermal conduction via its projected part contacting the housing, and provides structural support. This multi-functionality eliminates the need for separate cooling structures, thereby cooling the pump while maintaining housing simplicity and component commonality.
Solution Approach 2:
The fuel flowing through the feed pipe automatically performs the cooling function as it passes through the system. The feed pipe itself serves as the heat transfer medium and cooling pathway, eliminating the need for dedicated cooling systems or additional components. The fuel's flow through the feed pipe inherently cools the high pressure fuel pump through thermal conduction.
2Adaptability or versatility
If the high pressure fuel pump is fixed to the cylinder head and operated with cam shaft rotation, then the pump can be integrated into the engine structure, but heat from the cylinder head transmits to the fuel pump causing heat-up
Solution Approach 1:
The feed pipe acts as an intermediary thermal management component between the fuel source and the high pressure fuel pump. By positioning the feed pipe's projected part to contact the housing near the fuel pump, it creates a thermal conduction pathway that introduces cooler fuel to the pump area, thereby mediating the heat transfer from the cylinder head and cooling the fuel pump.
3Temperature
If fuel is fed only to the intake passage fuel injection valve, then the high pressure fuel pump can be cooled, but this mode cannot support high load operation requiring cylinder inside fuel injection
Solution Approach 1:
The feed pipe structure with its projected part contacting the housing is designed to support both cooling function and dual fuel injection modes. The same feed pipe configuration enables the system to operate in MPI mode (cooling the pump) and DI mode (high load operation) without requiring structural modifications, thereby providing adaptability across different operating conditions while maintaining thermal management.
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 solution effectively cools the high-pressure fuel pump and base, reducing heat transmission from the cylinder head, preventing faulty operations, and allowing for cost-effective use across various engine modes by maintaining the high-pressure fuel pump's integrity and performance.
Implementation Method 1
a high heat conductivity feed pipe that branches fuel from the fuel tank to both the cylinder inside fuel injection valve and the intake passage fuel injection valve, with a projected part extending to the base for enhanced heat transmission and cooling
Data Source
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AI summary
An internal combustion engine including an intake passage fuel injection valve for injecting fuel into an intake passage and a cylinder inside fuel injection valve for injecting fuel into a combustion chamber, includes: a fuel pump pressurizing and feeding fuel, which is fed from a fuel tank, to the cylinder inside fuel injection valve; a securing part provided on a cylinder head member of the internal combustion engine to secure the fuel pump; an introducing member having heat conductivity, the introducing member connected to the fuel pump and formed with: a first introducing path for introducing fuel from the fuel tank to the fuel pump; and a second introducing path for introducing fuel from the fuel tank to the intake passage fuel injection valve; and a heat transmitting member transmitting heat between the introducing member and the securing part.