Fuel Pump Mixing Region for High-Pressure Cooling
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Solution Overview
Problem
Existing fuel supply systems for internal combustion engines face challenges in maintaining optimal fuel temperature and cooling the high-pressure fuel pump, leading to potential overheating and damage.
Innovation Solution
A pump device with a mixing region that combines fuel from the low-pressure outlet with fresh fuel from the low-pressure fuel pump upstream of the high-pressure fuel pump, ensuring the fuel supplied to the engine is at a lower temperature, effectively cooling the high-pressure fuel pump and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If fuel is supplied through the high-pressure fuel pump, then fuel delivery pressure is improved, but fuel temperature increases causing overheating
Solution Approach 1:
The fuel flow path is segmented into multiple channels: a first channel supplies fuel to the high-pressure fuel pump, while a second channel supplies cooled fuel from the mixing region to the low-pressure port. This segmentation allows different fuel paths with different temperature characteristics, resolving the contradiction between pressure delivery and temperature control.
Solution Approach 2:
The mixing region acts as an intermediary component that receives hot fuel from the high-pressure fuel pump and mixes it with cooler fuel from the low-pressure fuel pump. This intermediary mixing process reduces the fuel temperature before it reaches the low-pressure port, solving the overheating problem while maintaining the high-pressure delivery function.
2Temperature
If fuel is cooled by mixing with fresh fuel, then fuel temperature is reduced, but device complexity increases
Solution Approach 1:
The mixing region merges the hot fuel flow from the high-pressure fuel pump with the cool fuel flow from the low-pressure fuel pump in a single integrated component. This merging approach achieves temperature control without requiring separate cooling systems, thereby limiting the increase in device complexity while effectively reducing fuel temperature.
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 ensures a reliable and efficient fuel supply to the internal combustion engine by maintaining fuel at a low temperature, effectively cooling the high-pressure fuel pump and preventing overheating, thus ensuring a consistent and safe operation.
Implementation Method 1
at least one mixing region (64) for mixing the fuel flowing through the low-pressure outlet (37) with fuel fed to the mixing region (64) from the low-pressure fuel pump (28) upstream of the high-pressure fuel pump (10)
Data Source
AI summary
A pump device for an internal combustion engine, having a high-pressure fuel pump for supplying fuel to a first injection device, having at least one low-pressure inlet, via which the fuel is fed to the high-pressure fuel pump from a low-pressure fuel pump, having at least one low-pressure outlet for conducting the fuel conveyed by the low-pressure fuel pump and fed via the low-pressure inlet to the high-pressure fuel pump out of the high-pressure fuel pump, and having at least one low-pressure port, for conducting fuel conveyed by the low-pressure fuel pump to a second injection device. At least one mixing region mixes the fuel flowing through the low-pressure outlet with fuel fed to the mixing region from the low-pressure fuel pump upstream of the high-pressure fuel pump. The low-pressure port is fluidically connected to the mixing region, and the low-pressure inlet is supplied with fuel from the mixing region.