US 12,134,995 B2
Method for controlling combustion system, combustion system, and internal combustion engine
Xuguang Tan, Shandong (CN); Dehui Tong, Shandong (CN); Peng Zhou, Shandong (CN); Xiaoxin Liu, Shandong (CN); and Bin Pang, Shandong (CN)
Assigned to WEICHAI POWER CO., LTD., Shandong (CN)
Appl. No. 18/276,926
Filed by WEICHAI POWER CO., LTD, Shandong (CN)
PCT Filed Dec. 13, 2021, PCT No. PCT/CN2021/137391
§ 371(c)(1), (2) Date Aug. 11, 2023,
PCT Pub. No. WO2022/262218, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. 202110669921.7 (CN), filed on Jun. 17, 2021.
Prior Publication US 2024/0117780 A1, Apr. 11, 2024
Int. Cl. F02D 41/40 (2006.01); F02D 41/24 (2006.01); F02D 41/38 (2006.01)
CPC F02D 41/402 (2013.01) [F02D 41/2432 (2013.01); F02D 41/2467 (2013.01); F02D 41/3836 (2013.01); F02D 2041/389 (2013.01); F02D 2200/024 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for controlling a combustion system, wherein the combustion system comprises a piston, a fuel injector and a cylinder, the fuel injector injects a main fuel into the cylinder in succession in a main fuel injection stage to drive the piston to work, and the method for controlling a combustion system comprises:
controlling the fuel injector to
execute a first-stage main fuel injection in a compression stroke to allow a cylinder pressure in the cylinder to reach a target pressure peak value, wherein the first-stage main fuel injection comprises at least one injection and lasts to a power stroke; and
execute a second-stage main fuel injection before the cylinder pressure in the cylinder is at a descending critical point to allow the cylinder pressure in the cylinder to be maintained at the target pressure peak value for a predetermined time, wherein the second-stage main fuel injection comprises at least one injection, and fuel injected in the second-stage main fuel injection and fuel injected in the first-stage main fuel injection are superimposed;
wherein a calibration parameter of a single main fuel injection is a parameter of the single main fuel injection calibrated when fuel consumption of an internal combustion engine is minimized and nitrogen oxide emission of the internal combustion engine is minimized under a condition of meeting an emission requirement of nitrogen oxides, the calibration parameter of the single main fuel injection comprises a calibration injection quantity of the single main fuel injection, and total injection quantity of the first-stage main fuel injection and the second-stage main fuel injection is equal to the calibration injection quantity of the single main fuel injection;
wherein an injection quantity of the first-stage main fuel injection is Q1, an injection quantity of the second-stage main fuel injection is Q2, and Q2 is equal to 0.05Q1 to 0.5Q1;
wherein a duration of the first-stage main fuel injection is determined according to the injection quantity of the first-stage main fuel injection and an injection pressure of the first-stage main fuel injection, and a duration of the second-stage main fuel injection is determined according to the injection quantity of the second-stage main fuel injection and an injection pressure of the second-stage main fuel injection;
wherein the calibration parameter of the single main fuel injection further comprises a calibration injection pressure of the single main fuel injection, the injection pressure of the first-stage main fuel injection is greater than the calibration injection pressure of the single main fuel injection, and the injection pressure of the second-stage main fuel injection is greater than or equal to the injection pressure of the first-stage main fuel injection.