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Method of estimating soot using a radio frequency sensor

A soot, radio frequency technology, applied in the field of radio frequency sensing measurement such as soot in diesel particulate filters, can solve the problem of incorrect inference detection and correction

Pending Publication Date: 2021-05-25
PERKINS ENGINES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Furthermore, because in a derivative model the next value is based on a change from the previous value, incorrect inferences will persist and have potentially significant consequences without inherent means for detection and correction

Method used

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  • Method of estimating soot using a radio frequency sensor
  • Method of estimating soot using a radio frequency sensor
  • Method of estimating soot using a radio frequency sensor

Examples

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Embodiment Construction

[0032] figure 1 Shown is the hardware arrangement of an engine assembly 100 comprising an internal combustion engine 200 and an aftertreatment device 300 including a radio frequency soot sensor 350 for use in accordance with the method of the present invention.

[0033] In addition to an internal combustion engine and an aftertreatment device, engine assembly 100 may also include a turbocharger 400 and an exhaust gas recirculation circuit 500 .

[0034] The exhaust gas recirculation loop includes an EGR precooler 510 , an EGR valve 520 , an EGR cooler 530 and an EGR mixer 540 .

[0035] Internal combustion engine 200 may include a combustion chamber in which fuel may be combusted with air to generate kinetic energy. Air may be supplied to the combustion chamber via an air cleaner (filter) 430 , a compressor 410 of the turbocharger 400 , an air cooler 440 , and an EGR mixer 540 of the EGR circuit 500 .

[0036] Exhaust gas from combustion in the combustion chamber may be reci...

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Abstract

The invention provides a method of calibrating a soot load estimating function for a diesel particulate filter using measurements of radio frequency attenuation and temperature. The method comprises identifying a mean attenuation that exceeds a standard deviation threshold and using this as a reference value, using a data library to obtain a gradient corresponding to a linear approximation between mean attenuation and soot load for a given temperature, and using the reference value to determine an axis intercept value for use as an offset value for calibrating measurements of the soot load. The method can be extended to incorporate further gradient values at different temperatures. This method serves to limit the effect of resonant frequencies on the value of the mean attenuation, and accurately determines an initial inference for soot load.

Description

technical field [0001] The present invention relates to the field of measuring soot in eg diesel particulate filters using radio frequency (RF) sensing. Background technique [0002] It is known to use radio frequency sensors to infer the soot load in diesel particulate filters. This arrangement utilizes a radio frequency sensor comprising a radio frequency transmitter and a radio frequency receiver. The radio frequency waves are sent by the transmitter into the diesel particulate filter by sweeping frequency. Once through the DPF, the radio frequency waves are picked up by the receiver. Soot in the DPF affects the radio frequency waves during its passage through the DPF. The radio frequency waves received by the receiver are then interpreted to determine the degree of soot loading within the diesel particulate filter. [0003] Typically, a processor—which may be part of the engine management system—receives radio frequency data from the sensors and interprets that data ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N11/002F01N2900/1606F02D41/1467F02D41/1466F02D41/146F02D2200/0802F02D2200/0812F02D41/2474F01N9/002F01N2550/04F01N2560/12F02D41/2432
Inventor J·惠特克D·菲奇A·J·伊格C·布拉德利P·K·米什拉
Owner PERKINS ENGINES