Engine Seal Damage Counting via Thermal Modeling

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Solution Overview

Problem

Existing engine control systems fail to effectively monitor and predict seal damage due to varying temperatures, lack applicability to cylinder liner seals, and become less accurate as engines wear, especially across multiple configurations.

Innovation Solution

A control system embedded within an engine that includes sensors to measure combustion process parameters, determines heat generation and flux, calculates seal temperature using thermal models, and tracks damage over time to provide a real-time damage count.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing control systems are used to monitor seal damage, then the system complexity is low, but the measurement precision of seal damage is insufficient

Engineering Contradiction:
Improveseal damage monitoring accuracyVSAvoidcontrol system complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The system segments the seal damage monitoring process into distinct computational stages: heat generation calculation from combustion parameters, heat flux determination through thermal conduction models, temperature prediction at seal locations, and damage accumulation tracking. This segmentation allows complex monitoring to be achieved through modular, manageable computational steps rather than a single complex measurement system.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The system introduces intermediate physical quantities as mediators between combustion processes and seal damage: heat generation serves as an intermediary between combustion parameters and thermal effects, heat flux acts as a mediator between heat generation and temperature rise, and temperature serves as an intermediary between heat flux and damage accumulation. These intermediaries enable indirect but accurate measurement of seal damage through readily available combustion parameters.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If existing temperature monitoring systems are applied to cylinder liner seals, then the system is simple to implement, but the adaptability to different engine configurations is poor

Engineering Contradiction:
Improveapplicability across engine configurationsVSAvoidsystem implementation complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system employs universal thermal conduction models and heat transfer equations that can be applied across different engine configurations. The same fundamental physics principles govern heat flow whether the engine is diesel or gasoline, naturally aspirated or turbocharged. By using these universal models with configuration-specific parameters, the system achieves broad adaptability without requiring configuration-specific hardware modifications.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system adapts to different engine configurations by changing input parameters rather than changing the underlying model structure. Combustion parameters such as heat release rates, thermal conductivity values, and geometric dimensions are adjusted according to the specific engine configuration, while the core thermal conduction model remains unchanged. This parameter-based adaptation enables universal applicability across diverse engine types.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If existing temperature monitoring systems are used, then the system is easy to operate, but the reliability for predicting seal damage under varying temperatures is insufficient

Engineering Contradiction:
Improveseal damage prediction reliabilityVSAvoidsystem complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary calculations of heat generation, heat flux, and temperature distribution before seal damage occurs. By continuously tracking the thermal history and accumulating damage metrics in advance, the system can predict seal damage before it becomes critical, enabling preventive maintenance. This preliminary action approach transforms reactive monitoring into proactive damage prediction.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously comparing predicted seal temperatures and damage accumulation against acceptable thresholds. The damage count calculated from thermal history feeds back into maintenance scheduling decisions, and the system can adjust operational parameters to reduce thermal loading when damage accumulation approaches critical levels. This closed-loop feedback enhances reliability by enabling real-time damage assessment and corrective action.

Inventive Principle:
Principle #23Feedback

4Loss of information

If existing systems monitor engine components, then the system is simple, but the ability to provide actionable maintenance insights is limited

Engineering Contradiction:
Improvemaintenance information qualityVSAvoidsystem complexity
Core Design Contradiction:
Loss of informationVSDevice complexity

Solution Approach 1:

The system replaces physical seal inspection with computational thermal modeling and damage prediction. Instead of mechanically examining seals during disassembly, the system uses computational models to predict seal condition based on thermal history and operating parameters. This substitution eliminates the need for invasive inspections and provides continuous information about seal health, transforming maintenance from reactive to predictive.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 increases engine reliability by accurately monitoring seal damage, providing actionable insights for maintenance and design improvements across various engine configurations, maintaining accuracy as the engine wears.

Implementation Method 1

at least one sensor configured to generate a signal indicative of a combustion process occurring inside the cylinder liner

Methodology Applied
Scientific EffectCombustion: Combustion

Implementation Method 2

determine a heat flux through the engine based on the amount of heat and a heat flux model of the engine

Methodology Applied
Scientific EffectHeat flux: Conduction (thermal)

Implementation Method 3

determine a temperature at the seal based on the heat flux and a thermal model of the cylinder liner

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS9958358B2Control system having seal damage counting
Publication Date: 2018.05.01 CATERPILLAR INC
  • US9958358B2 patent drawing
  • US9958358B2 patent drawing
  • US9958358B2 patent drawing

AI summary

An imbedded control system is disclosed for use with an engine having a cylinder liner and a seal. The control system may have at least one sensor configured to generate a signal indicative of a combustion process occurring inside the cylinder liner, and a controller in communication with the sensor. The controller may be configured to determine an amount of heat generated inside the cylinder liner based on the signal and a combustion model of the engine, to determine a heat flux through the engine based on the amount of heat and a heat flux model of the engine, and to determine a temperature at the seal based on the heat flux and a thermal model of the cylinder liner. The controller may also be configured to track a time at the temperature, and to determine a damage count of the seal based on the time at the temperature.