US 11,913,366 B2
Heating device for an exhaust system of an internal combustion engine
Marco La Sana, Turin (IT); Emanuele Milani, Sandigliano (IT); Mauro Brignone, Turin (IT); and Luigi Lubrano, Novara (IT)
Assigned to MARELLI EUROPE S.P.A., Corbetta (IT)
Filed by MARELLI EUROPE S.P.A., Corbetta (IT)
Filed on Dec. 22, 2021, as Appl. No. 17/558,720.
Claims priority of application No. 102021000001871 (IT), filed on Jan. 29, 2021.
Prior Publication US 2022/0243633 A1, Aug. 4, 2022
Int. Cl. F01N 3/20 (2006.01); F01N 13/00 (2010.01)
CPC F01N 3/2033 (2013.01) [F01N 13/008 (2013.01); F01N 2560/06 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A heating device (6) for an exhaust system (1) of an internal combustion engine (2); the heating device (6) comprises:
a tubular body (12), where a combustion chamber (7) is obtained on the inside;
a fuel injector (9), which is mounted through a base wall (14) of the tubular body (12) so as to inject fuel into the combustion chamber (7);
at least one inlet opening (18), which can be connected to a fan (8) so as to receive an air flow, which is directed to the combustion chamber (7) and gets mixed with the fuel;
a feeding channel (21), which is entirely contained inside the tubular body (12), receives air from the inlet opening (18), surrounds an end portion of the fuel injector (9) and ends with a nozzle (22), which is arranged around a spray tip of the fuel injector (9);
a spark plug (10), which is mounted through a side wall (16) of the tubular body (12) so as to trigger the combustion of a mixture of air and fuel; and
a static mixer (23), which is shaped like an annulus, is arranged along the feeding channel (21) and around the fuel injector (9) and is configured to generate turbulences, in particular a swirling motion, in the air flowing towards the nozzle (22);
wherein an axial distance (X), namely measured along a longitudinal axis (13) of the tubular body (12), between the spray tip of the fuel injector (9) and a longitudinal axis (30) of the spark plug (10) ranges from 33% to 100% of an inner diameter (D) of the tubular body (12).