High Pressure Fuel Pump Thermal Management via Discharge Line

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Solution Overview

Problem

Existing high-pressure fuel pumps experience an increase in temperature due to heated fuel flowing into the pump interior, which can lead to inefficiencies and potential issues.

Innovation Solution

A fuel discharge line is used to convey fuel from the pump interior to the upper tappet chamber, with a throttle or valve to control the flow, ensuring that heated fuel is not fed back into the pump interior, and a connecting channel connects the tappet chambers for efficient fuel management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If fuel is fed into the upper tappet chamber via a fuel supply line, then the upper tappet chamber is supplied with fuel, but heated fuel flows into the pump interior causing temperature increase

Engineering Contradiction:

Improvefuel supply to upper tappet chamberVSAvoidfuel temperature in pump interior

Core Design Contradiction:

Quantity of substanceVSTemperature

Solution Approach 1:

The patent inverts the conventional fuel flow direction by using a fuel discharge line instead of a fuel supply line to connect the pump interior with the upper tappet chamber. This reversal prevents heated fuel from the tappet chamber from entering the pump interior, thereby resolving the temperature increase problem while maintaining proper fuel supply

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If a fuel line connects the pump interior to the upper tappet chamber, then fuel can flow between chambers, but it is difficult to control the fuel flow and prevent heating

Engineering Contradiction:

Improvefuel flow controlVSAvoidfuel temperature

Core Design Contradiction:

Ease of operationVSTemperature

Solution Approach 1:

The patent changes the flow direction parameter by converting the fuel line from a supply line to a discharge line. This parameter change fundamentally alters the fuel flow characteristics, ensuring that fuel flows from the pump interior to the upper tappet chamber rather than the reverse, thereby preventing heat transfer to the pump interior

Inventive Principle:

Principle #35Parameter changes

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 prevents heated fuel from entering the pump interior, maintaining optimal fuel temperature and ensuring a targeted flow, thereby enhancing the pump's efficiency and performance.

Implementation Method 1

a throttle or valve to control the flow

Methodology Applied

Scientific EffectThrottling: Pressure Drop

Implementation Method 2

Fuel is conveyed from the pump interior into the upper tappet chamber and discharged from there via the fuel discharge line

Methodology Applied

Scientific EffectFluid flow control:

Data Source

PatentEP2697501B1High pressure fuel pump for a fuel injection system of an internal combustion engine

Publication Date: 2019.05.01 ROBERT BOSCH GMBH

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AI summary

The invention relates to a high pressure fuel pump for a fuel injection system of an internal combustion engine having a pump housing 1, having an interior pump chamber 2 to which fuel is supplied, and having at least one pump element actuated by a pump shaft 3, which is rotatably mounted in the pump housing 1, via a roller plunger 5, which is slide bearing mounted in a guide, forming an upper plunger chamber 9, wherein the interior pump chamber 2 is fluidically connected to the plunger chamber 9. According to the invention, a high pressure fuel pump is provided by which a specific fuel flow of the at least one plunger chamber 9 is ensured. According to the invention, said aim is accomplished in that the plunger chamber 9 is connected to a fuel line 13 effecting a fuel throughput.