US 11,835,010 B2
Four-stroke internal combustion engine and method of operating four-stroke internal combustion engine
Andreas Dahl, Nyköping (SE); and Michael Vallinder, Mölnbo (SE)
Assigned to Scania CV AB, Södertälje (SE)
Appl. No. 17/431,186
Filed by Scania CV AB, Södertälje (SE)
PCT Filed Feb. 17, 2020, PCT No. PCT/SE2020/050179
§ 371(c)(1), (2) Date Aug. 16, 2021,
PCT Pub. No. WO2020/171759, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 1950212-9 (SE), filed on Feb. 20, 2019.
Prior Publication US 2022/0145823 A1, May 12, 2022
Prior Publication US 2023/0212999 A9, Jul. 6, 2023
Int. Cl. F02D 41/40 (2006.01); F02D 41/00 (2006.01); F02D 13/02 (2006.01)
CPC F02D 41/402 (2013.01) [F02D 13/0249 (2013.01); F02D 41/009 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of controlling operation of a four-stroke direct injection internal combustion engine during regeneration of a particulate filter of an exhaust gas treatment system connected to the internal combustion engine, wherein said internal combustion engine comprises at least one cylinder arrangement, a crankshaft, and a camshaft, the cylinder arrangement comprising a combustion chamber, a fuel injector, an exhaust valve, a cylinder bore, and a piston configured to reciprocate in the cylinder bore and being connected to the crankshaft, wherein the camshaft is configured to control the opening and closing of the exhaust valve, wherein a timing of the camshaft is controllable, and wherein the method comprises the steps of:
a) adjusting the timing of the camshaft to advance a closing of the exhaust valve at least sixty (60) crankshaft angle degrees;
b) controlling the fuel injector to inject fuel into the cylinder bore during a compression stroke of the piston within a range of −40 to −15 crankshaft angle degrees in relation to zero (0) crankshaft angle degrees being at top dead center fire; and
c) controlling the fuel injector to inject fuel into the cylinder bore three separate instances during a power stroke of the piston as follows:
controlling the fuel injector to inject fuel into the cylinder bore at a first instance after the power stroke of the piston has been initiated;
controlling the fuel injector to inject fuel into the cylinder bore at a second instance after the first instance and within a range of 30 to 50 degrees crankshaft angle in relation to zero (0) crankshaft angle degrees being at top dead center fire; and
controlling the fuel injector to inject fuel into the cylinder bore at a third instance after the second instance and after an opening of the exhaust valve during the power stroke,
wherein the combination of controlling the fuel injector to inject fuel at steps b) thru c), while controlling the timing of the camshaft to advance closing of the exhaust valve in step a) thereby causes at least one of an increase in: (i) a temperature of an exhaust gas exiting the internal combustion engine, or (ii) a content of nitrogen oxide in the exhaust gas.