Common Rail Fuel Injection System Leak Detection and Pressure Control

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Solution Overview

Problem

Current fuel injection systems for piston engines, particularly common rail systems, face inefficiencies in fuel management and leak detection, leading to suboptimal engine operation due to uncontrolled fuel leaks and pressure imbalances.

Innovation Solution

A fuel injection system incorporating a pressure accumulator network with integrated leak detection and a leakage channel arrangement, featuring a leak detector to identify excessive fuel leaks, and a return pipe system to manage fuel pressure and prevent over-pressure, ensuring efficient fuel injection and leak removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a common rail fuel injection system is used to improve engine operation, then fuel injection performance is improved, but fuel leak management and pressure control become problematic

Engineering Contradiction:

Improveengine operation efficiencyVSAvoidfuel leak control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism by connecting a leak detector to the common rail system. The detector monitors fuel leaks in real-time and provides signals to the control unit, which then adjusts the injection strategy or activates warning systems. This closed-loop feedback enables continuous monitoring and active management of fuel leaks, resolving the reliability issue while maintaining productivity improvements.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary leakage channel arrangement between the high-pressure fuel system and the environment. This intermediary system provides a controlled path for leak detection and management, allowing the system to identify and respond to leaks without compromising the primary fuel injection function. The intermediary acts as a buffer that enables safe monitoring and control of potential fuel escape.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If pressure accumulators are used to maintain fuel pressure, then injection pressure stability is improved, but over-pressure risks increase

Engineering Contradiction:

Improvefuel pressure stabilityVSAvoidover-pressure damage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent applies beforehand cushioning by implementing a leakage channel arrangement that is pre-configured to activate when over-pressure conditions occur. This preventive measure allows excess pressure to be safely discharged through controlled leakage paths before damage can occur to the pressure accumulators or other system components. The system is designed in advance to handle pressure excursions safely.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent implements a mechanism to discard excess fuel through the leakage channel arrangement when over-pressure conditions are detected. The control unit monitors pressure levels and activates the leakage path to discard surplus fuel, thereby protecting the pressure accumulators from over-pressure damage. This selective discarding maintains pressure stability while preventing harmful over-pressure effects.

Inventive Principle:

Principle #34Discarding and recovering

3Reliability

If leak detection is added to the fuel injection system, then fuel leak management is improved, but system complexity increases

Engineering Contradiction:

Improveleak detection capabilityVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent achieves universality by designing the leakage channel arrangement to serve multiple functions simultaneously. The same structural elements that manage fuel pressure and enable controlled leakage also provide the detection pathway. The control unit integrates leak detection with existing pressure management functions, reducing the need for entirely separate detection systems and minimizing overall complexity while improving reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The system enhances engine efficiency by accurately controlling fuel pressure and detecting leaks, thereby maintaining optimal engine operation and preventing damage from over-pressure, while ensuring reliable fuel injection and leak management.

Implementation Method 1

at least one pressure accumulator for pressurized fuel

Methodology Applied

Scientific EffectPressure accumulation: Hydraulic Accumulator

Implementation Method 2

The leakage channel arrangement is provided with a leak detector for detecting a fuel leak

Methodology Applied

Scientific EffectPressure detection: Pressure Gradient

Data Source

PatentEP2297448B1Fuel injection system for a piston engine

Publication Date: 2012.01.25 WARTSILA FINLAND OY

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AI summary

The invention relates to a common rail fuel injectionsystem(1) for a piston engine with several cylinders (12). The fuel injection system (1) comprises at least one pressure accumulator (7, 8, 18) for pressurized fuel, injectors (6) for injecting pressurized fuel into the cylinders (12) and a leakage channel arrangement (24) for removing fuel leaking from the injectors (6). The leakage channel arrangement (24) is provided with a leak detector (28) for detecting a fuel leak.