US 12,129,628 B2
Control architecture for prime mover stall prevention
Mahesh K Jadhav, Pune (IN); and Kedar Rugge, Pune (IN)
Assigned to DANFOSS A/S, Nordborg (DK)
Appl. No. 17/997,320
Filed by Danfoss A/S, Nordborg (DK)
PCT Filed Apr. 30, 2021, PCT No. PCT/EP2021/025167
§ 371(c)(1), (2) Date Oct. 27, 2022,
PCT Pub. No. WO2021/219253, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202011018679 (IN), filed on May 1, 2020.
Prior Publication US 2023/0167629 A1, Jun. 1, 2023
Int. Cl. E02F 9/22 (2006.01); F15B 11/16 (2006.01); F15B 21/08 (2006.01)
CPC E02F 9/2221 (2013.01) [E02F 9/2228 (2013.01); E02F 9/2235 (2013.01); E02F 9/226 (2013.01); F15B 11/161 (2013.01); F15B 11/163 (2013.01); F15B 11/165 (2013.01); F15B 21/087 (2013.01); E02F 9/2246 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/6651 (2013.01); F15B 2211/6652 (2013.01); F15B 2211/6654 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for preventing prime mover stall for a work machine including a hydraulic system having a plurality of control valves served by a hydraulic pump, the method comprising:
determining, at a controller, an actual required flow rate value for the plurality control valves;
determining, at the controller, a total maximum flow rate to the plurality of control valves that will enable the prime mover to operate without stalling; and
operating the plurality of control valves, with the controller, such that a combined total flow of the plurality control valves is at or below the total maximum flow rate such that the pump operates at a condition below which prime mover stall will occur;
wherein the step of determining the total maximum flow rate includes referencing a first map correlating prime mover speed with prime mover torque and further includes generating a second map correlating pump flow with pressure at one or more prime mover speeds based on the first map.
 
6. A method for preventing prime mover stall for a work machine including a hydraulic system, the method comprising:
receiving, at a control system, a prime mover speed requirement and a hydraulic system inlet pressure value associated with one or more control valves of the hydraulic circuit;
calculating, at the control system, an actual required flow rate value of the hydraulic circuit;
referencing a map, with the control system, using the prime mover speed setting, the actual required flow rate, and the inlet pressure value to return a maximum flow rate setting;
continuously or repeatedly monitoring an actual prime mover speed and updating the maximum flow rate setting based on the actual prime mover speed;
operating the one or more control valves, with the control system, such that the lesser of the actual required flow rate and the maximum flow rate setting is not exceeded; and
controlling a pump of the hydraulic system with a load-sense control to de-stroke the pump to meet the maximum flow rate setting to prevent stalling of the prime mover.