US 12,092,000 B2
Determining an estimate of soot load in a diesel particulate filter using a radio frequency sensor
Antony J. Eager, Peterborough (GB)
Assigned to Perkins Engines Company Limited, Peterborough (GB)
Appl. No. 17/601,770
Filed by Perkins Engines Company Limited, Peterborough (GB)
PCT Filed Apr. 7, 2020, PCT No. PCT/EP2020/025164
§ 371(c)(1), (2) Date Oct. 6, 2021,
PCT Pub. No. WO2020/207628, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 1905247 (GB), filed on Apr. 12, 2019.
Prior Publication US 2022/0195909 A1, Jun. 23, 2022
Int. Cl. F01N 11/00 (2006.01); F01N 3/021 (2006.01); G01N 22/00 (2006.01)
CPC F01N 11/00 (2013.01) [F01N 3/021 (2013.01); G01N 22/00 (2013.01); F01N 2550/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An engine assembly for determining an estimate of soot load in a diesel particulate filter of the engine assembly, the engine assembly comprising an engine control module and a radio frequency soot sensor, the engine control module configured to:
receive a first mean attenuation value derived from attenuation values for each of a first plurality of radio frequencies within a first band of radio frequencies detected by the radio frequency sensor;
receive first standard deviation data for the mean attenuation value relating to the first plurality of radio frequencies within the first band of radio frequencies;
determine whether the first standard deviation data exceeds a standard deviation threshold;
(a) in the event that the first standard deviation data does not exceed the standard deviation threshold:
use the first mean attenuation value to infer a value for soot load in the diesel particulate filter;
(b) in the event that the first standard deviation data exceeds the standard deviation threshold:
receive a second mean attenuation value derived from attenuation values for each of a second plurality of radio frequencies within a second band of radio frequencies;
receive second standard deviation data relating to the mean attenuation value for a second plurality of radio frequencies within the second band of radio frequencies detected by the radio frequency sensor; and
in the event that the second standard deviation data does not exceed the standard deviation threshold:
use the second mean attenuation value to infer the value for soot load in the diesel particulate filter.