Particulate Filter Over-Temperature Mitigation Strategies

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Solution Overview

Problem

Exhaust gas treatment systems face challenges in accurately diagnosing and mitigating over-temperature during particulate filter regeneration, which can lead to damage or destruction of components in the exhaust gas treatment system and surrounding components.

Innovation Solution

A method is implemented to detect over-temperature during particulate filter regeneration, initiating mitigation strategies such as inhibiting regeneration, altering engine operating parameters, and activating a cooling fan, including shutting down the exhaust gas source after a delay, to prevent thermal damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high temperature soot burning is performed during particulate filter regeneration, then the filter is cleaned effectively, but excessive thermal energy causes damage to exhaust gas treatment system components and surrounding components

Engineering Contradiction:

Improveparticulate filter regeneration effectivenessVSAvoidthermal damage to components

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors exhaust gas temperature and filter temperature using sensors, and adjusts regeneration parameters in real-time based on feedback signals. When temperature approaches dangerous thresholds, the control system automatically reduces fuel injection or stops regeneration to prevent thermal damage while maintaining cleaning effectiveness.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes operational parameters such as fuel injection timing, injection quantity, and air-fuel ratio during regeneration. By adjusting these parameters, the system optimizes combustion temperature to achieve sufficient soot burning while preventing excessive heat that would damage components.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If engine control systems monitor thermal energy during regeneration, then component damage is prevented, but diagnostic accuracy is insufficient to reliably detect excessive thermal energy

Engineering Contradiction:

Improvecomponent protection reliabilityVSAvoidthermal energy diagnosis accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system introduces intermediate temperature sensors positioned strategically in the exhaust system to indirectly measure thermal conditions affecting components. These sensors provide more accurate thermal energy assessment than direct component temperature measurement, enabling better diagnostic precision and timely protection actions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The control system establishes predetermined temperature thresholds and safety margins before regeneration begins. When sensor readings approach these pre-set limits, the system proactively adjusts operations to prevent excessive thermal energy accumulation, ensuring component protection before damage occurs.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple mitigation strategies are initiated upon detecting over-temperature, then thermal damage is prevented, but system complexity increases

Engineering Contradiction:

Improveover-temperature mitigation effectivenessVSAvoidmitigation system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements a dynamic, hierarchical mitigation strategy where multiple protection measures are available but activated based on severity. The control system adjusts the number and type of mitigation actions (reducing fuel injection, stopping regeneration, activating cooling) according to real-time temperature conditions, maintaining reliability while avoiding unnecessary complexity.

Inventive Principle:

Principle #15Dynamics

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 effectively mitigates over-temperature conditions, allowing for safe regeneration of particulate filters even when soot loading is high, thereby preventing damage to the filter and other components.

Implementation Method 1

activating a cooling fan... The exhaust gas source can include a radiator, and the cooling fan can be located proximate the radiator

Methodology Applied

Scientific EffectForced Convection: Forced Convection

Implementation Method 2

All such methods impart substantial thermal energy to the exhaust gas system, and surrounding components

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10156174B2Methods for mitigating over-temperature during an exhaust gas system particulate filter device regeneration

Publication Date: 2018.12.18 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

Methods for mitigating over-temperature during an exhaust gas system particulate filter device regeneration are provided. The exhaust gas system can include an exhaust gas stream supplied by an exhaust gas source to a particulate filter device through an exhaust gas conduit. The methods can include detecting an over-temperature during a particulate filter regeneration, initiating one or more first mitigation strategies, and shutting down the exhaust gas source. The one or more first mitigation strategies can include inhibiting the particulate filter device regeneration, altering the exhaust gas source operating parameters, and activating a cooling fan. The exhaust gas source can include an internal combustion engine configured to power a vehicle, and the operating parameters can be altered by a torque limiter.