US 12,133,484 B2
Grain cleaning system and method of controlling such
Dan Hermann, Randers (DK); and Morten Leth Bilde, Langaa (DK)
Assigned to AGCO International GmbH, Neuhausen (CH)
Appl. No. 17/417,100
Filed by AGCO International GmbH, Neuhausen (CH)
PCT Filed Nov. 22, 2019, PCT No. PCT/EP2019/082250
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/126308, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 1820713 (GB), filed on Dec. 19, 2018.
Prior Publication US 2022/0046856 A1, Feb. 17, 2022
Int. Cl. A01D 41/127 (2006.01); A01F 12/18 (2006.01); A01F 12/28 (2006.01); A01F 12/44 (2006.01); A01F 12/48 (2006.01); A01F 12/52 (2006.01); G01P 5/24 (2006.01)
CPC A01D 41/1276 (2013.01) [A01D 41/1272 (2013.01); A01F 12/181 (2013.01); A01F 12/28 (2013.01); A01F 12/444 (2013.01); A01F 12/448 (2013.01); A01F 12/48 (2013.01); A01F 12/52 (2013.01); G01P 5/248 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A grain cleaning system comprising:
a screening apparatus having a duct and a sieve disposed in the duct;
a fan arranged to generate a cleaning airstream through the duct;
an ultrasonic sensing device comprising:
a transmitter configured to transmit a base signal through the cleaning airstream; and
a receiver spaced from the transmitter and configured to receive and transduce a modified signal that comprises a modified portion of the base signal and;
an electronic control unit (ECU) that is in communication with the sensing device, wherein the ECU is configured to generate control signals based upon a phase shift value which is determined from a parameter of the base signal and a parameter of the modified signal,
wherein the receiver is configured to transduce a signal reflected off of airborne particles in the cleaning airstream, and wherein the ECU is configured to generate a value for the particle velocity from a Doppler frequency which is determined from a frequency of the base signal and a frequency of the reflected signal.