Continuous Injection Detection via Pressure Drop Timing

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Solution Overview

Problem

Current methods for detecting continuous injection in internal combustion engines cannot accurately identify the specific combustion chamber or injector responsible, leading to costly and laborious replacements of all injectors, especially in large engines.

Innovation Solution

A method that senses high pressure in the injection system time-dependently to identify the start time of a pressure drop, allowing for the assignment of continuous injection to a specific combustion chamber or group, thereby enabling targeted replacement of defective injectors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous injection detection is performed without combustion chamber identification, then detection reliability is improved, but loss of information worsens (specific combustion chamber cannot be identified)

Engineering Contradiction:

Improvecontinuous injection detection reliabilityVSAvoidcombustion chamber identification information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments the detection process into two distinct stages: first detecting continuous injection occurrence, then identifying the specific combustion chamber responsible. This is achieved by dividing the time interval into multiple sub-intervals and analyzing pressure drops in each segment, allowing the system to pinpoint the exact combustion chamber without compromising detection reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent adds a temporal dimension to the detection process by analyzing pressure changes over time intervals. By introducing time-based segmentation and examining pressure drops at different time points, the system can identify which combustion chamber is responsible for continuous injection while maintaining the reliability of the initial detection

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If all injectors are replaced to ensure system reliability, then reliability is improved, but loss of substance worsens (unnecessary injector replacement)

Engineering Contradiction:

Improveinjection system reliabilityVSAvoidnumber of injectors replaced

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent extracts and identifies the specific defective injector by analyzing pressure drop patterns in different time intervals. Instead of replacing all injectors, the system isolates the single problematic injector through temporal analysis, removing only the necessary component while preserving functional ones

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses parameter changes in pressure over time to identify the defective injector. By monitoring how pressure changes in different time intervals after continuous injection detection, the system can determine which specific injector is faulty based on the timing and magnitude of pressure drops, enabling targeted replacement

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If comprehensive continuous injection detection is implemented, then detection capability is improved, but difficulty of detecting and measuring worsens (complexity of identifying specific injector)

Engineering Contradiction:

Improvecontinuous injection detection precisionVSAvoidinjector identification complexity

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent simplifies the measurement complexity by segmenting the time interval into discrete sub-intervals and assigning each to specific combustion chambers. This segmentation transforms a complex identification problem into a series of simpler, time-based measurements that can be systematically analyzed to pinpoint the defective injector

Inventive Principle:

Principle #1Segmentation

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 approach allows for quicker and more cost-effective identification and replacement of defective injectors by accurately pinpointing the affected combustion chamber or group, reducing unnecessary replacements and improving diagnostic efficiency.

Implementation Method 1

A high pressure in the injection system, in particular a high pressure in the high-pressure accumulator, is sensed in a time-dependent fashion

Methodology Applied

Scientific EffectPressure sensing:

Data Source

PatentUS10927783B2Method for ascertaining a continuous injection of a combustion chamber, injection system, and internal combustion engine comprising such an injection system

Publication Date: 2021.02.23 ROLLS ROYCE SOLUTIONS GMBH

AI summary

A method for identifying a continuously injecting combustion chamber of an internal combustion engine which has an injection system with a high-pressure accumulator for a fuel, having the following steps: time-dependent sensing of a high pressure in the injection system; starting a continuous-injection detection process at a starting time while the internal combustion engine is operating; identifying a start time of a pressure drop which occurs chronologically before the starting time and at which the high pressure in the injection system begins to drop if continuous injection has been detected; and identifying at least one combustion chamber to which the continuous injection can be assigned, on the basis of the start time of the pressure drop.