Electromagnetic Soot Detection for Exhaust Filter Regeneration

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Solution Overview

Problem

Existing exhaust particulate filter systems face inefficiencies and cost penalties in regenerating filters due to inaccurate soot detection, with current electromagnetic-based methods being computationally challenging and poorly suited for field conditions.

Innovation Solution

A method and system that transmit electromagnetic energy through an exhaust particulate filter to detect soot and ash levels by determining the attenuation of the energy, using a data processor to calculate an ash value and output a regeneration suitability signal, thereby optimizing regeneration timing and reducing energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electromagnetic energy transmission methods are used to detect soot levels, then soot detection capability is provided, but computational complexity and hardware cost increase

Engineering Contradiction:

Improvesoot detection accuracyVSAvoidhardware and computational complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the essential measurement capability by using a simple electromagnetic transmitter and receiver pair to measure attenuation, eliminating complex spectral analysis hardware and computational algorithms while maintaining sufficient soot detection accuracy for regeneration control

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs inexpensive electromagnetic transmitters and receivers that can be easily replaced or recalibrated, avoiding investment in expensive, complex measurement systems that would require sophisticated maintenance and calibration infrastructure

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If regeneration is performed frequently to maintain filter effectiveness, then filter performance is maintained, but energy consumption and operational efficiency decrease

Engineering Contradiction:

Improvefilter effectivenessVSAvoidenergy consumption during regeneration

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a feedback control system where electromagnetic attenuation measurements continuously monitor soot load levels, and regeneration is triggered only when attenuation exceeds a threshold indicating sufficient soot accumulation, optimizing the balance between filter effectiveness and energy consumption

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces dynamic adaptation by adjusting the attenuation threshold based on measured ash accumulation levels, allowing the regeneration trigger point to vary with filter aging and operating conditions, thereby maintaining optimal filter performance while minimizing unnecessary regeneration events

Inventive Principle:

Principle #15Dynamics

3Device complexity

If ash accumulation is not accounted for in soot detection, then detection system remains simple, but soot measurement accuracy deteriorates

Engineering Contradiction:

Improvedetection system simplicityVSAvoidsoot measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces ash accumulation measurement as an intermediary parameter that mediates between the simple electromagnetic attenuation measurement and the accurate determination of soot load, allowing the system to maintain simplicity while achieving accurate soot quantification by compensating for ash interference

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enables more accurate soot detection and optimized regeneration, improving engine efficiency by accounting for ash accumulation and temperature variations, thus reducing the frequency of filter regeneration and maintaining filter effectiveness.

Implementation Method 1

transmitting electromagnetic energy through an exhaust particulate filter containing trapped soot and ash, and attenuating the transmitted electromagnetic energy in response to the trapped soot

Methodology Applied

Scientific EffectElectromagnetic radiation absorption: Absorption (EM radiation)

Data Source

PatentUS9062576B2Exhaust particulate filter system and operating method therefor

Publication Date: 2015.06.23 CATERPILLAR INC

AI summary

Operating an exhaust particulate filter system for an internal combustion engine includes transmitting electromagnetic energy, for example having a frequency above about 2 GHz, through an exhaust particulate filter containing trapped soot. The transmitted electromagnetic energy may be attenuated in response to the trapped soot, and a filter soot loading value calculated based at least in part upon a correlation among an attenuation of the electromagnetic energy, a temperature of the filter, and a mass of the trapped soot. An algorithm based upon a partial derivative of an equation representing the correlation may be used in calculating the filter soot loading value, and a resulting soot mass. The calculated soot mass is used to determine a relative soot loading state of the filter in conjunction with information as to ash loading. Responsive to determining the relative soot loading state satisfies regeneration suitability conditions, a regeneration initiation command may be outputted.