Fuel Pump Coolant Cap Assembly Thermal Management
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Solution Overview
Problem
The mounting of high-pressure fuel pumps in engine cylinder heads leads to elevated fuel temperatures due to conductive heat transfer, which becomes more pronounced as emissions requirements increase fuel pressures, causing temperature and emissions issues.
Innovation Solution
A fuel pump coolant cap assembly with a flanged bottom surface, a fuel pump support structure, and a fuel cooling ring forming a sealed coolant cavity, along with a thermal barrier layer and phase change fluid injection, to reduce heat transfer and maintain a sealed coolant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fuel pump is mounted in the cylinder head to achieve compact design and efficient space utilization, then the engine assembly achieves better integration and reduced overall size, but conductive heat transfer through the pump mounting interface causes elevated fuel temperature and boiling issues
Solution Approach 1:
The mounting interface is segmented into multiple functional layers: a thermal barrier layer (such as a gasket or coating) between the cylinder head and fuel pump, and a separate coolant cooling structure. This segmentation allows the compact mounting arrangement to be maintained while introducing thermal isolation mechanisms that prevent direct heat transfer to the fuel pump and fuel, thereby resolving the contradiction between compact design and temperature control.
Solution Approach 2:
A thermal barrier layer acts as an intermediary element between the hot cylinder head and the fuel pump. This intermediary layer (gasket, coating, or other thermal isolation material) blocks conductive heat transfer paths, allowing the fuel pump to be mounted close to the cylinder head for compactness while preventing excessive heat from reaching the fuel pump and causing fuel temperature rise.
2Manufacturing precision
If fuel pressure is increased to meet emissions requirements for direct-injection engines, then fuel injection precision and emissions control improve, but the combination of higher pressure and conductive heat transfer causes elevated fuel temperature and boiling issues
Solution Approach 1:
The thermal barrier layer serves as a protective intermediary that shields the fuel pump and fuel from heat generated by the cylinder head. This allows the system to operate at high fuel pressures required for direct-injection emissions control without the fuel temperature rising to boiling points, thus maintaining both injection precision and temperature safety.
Solution Approach 2:
The coolant cooling structure utilizes phase change (evaporation/condensation) of coolant to absorb excess heat from the fuel pump mounting interface. This phase transition mechanism provides active cooling that prevents fuel temperature rise even under high-pressure operating conditions, allowing emissions-optimized fuel injection to proceed without thermal side effects.
3Temperature
If a coolant cooling structure is added to reduce heat transfer from the cylinder head, then fuel temperature control improves, but the device complexity and number of components increase
Solution Approach 1:
The coolant cooling structure is merged with the existing cylinder head and fuel pump mounting architecture. The cooling passages are integrated into the cylinder head or fuel pump support structure, and the thermal barrier layer is incorporated into the existing gasket or mounting interface. This merging approach provides effective heat management while minimizing additional components and structural complexity.
Solution Approach 2:
The thermal barrier layer is applied locally at the critical heat transfer interface between the cylinder head and fuel pump, rather than cooling the entire engine assembly. This localized approach targets the specific problem area (fuel pump mounting interface) with minimal added complexity, providing effective temperature control only where needed.
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
Effectively addresses fuel temperature and emissions issues by reducing heat transfer from the engine block to the fuel pump, maintaining a sealed coolant flow, and using thermal barriers to manage heat effectively.
Implementation Method 1
a sealed coolant cavity is formed by a portion of an external surface of the fuel pump support structure and an internal surface of the fuel cooling ring
Implementation Method 2
conductive heat transfer through the pump mounting interface
Implementation Method 3
a thermal barrier layer disposed between a top surface of the fuel cooling ring and the flanged bottom surface of the fuel pump cap
Implementation Method 4
a phase change fluid injection port in communication with the sealed coolant cavity
Data Source
AI summary
A fuel pump coolant assembly includes a fuel pump cap having a flanged bottom surface and a fuel pump support structure. A fuel cooling ring disposed between the fuel pump cap and the fuel pump support structure, wherein a sealed coolant cavity is formed by a portion of an external surface of the fuel pump support structure and an internal surface of the fuel cooling ring.