US 12,116,916 B1
Exhaust assembly temperature regulation for shutdown
Chad Palmer Koci, Washington, IL (US); Chetan Kulkarni, West Lafayette, IN (US); Bradley Hodges, Ft Worth, TX (US); and Ryan Matthew Brown, West Lafayette, IN (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Jan. 8, 2024, as Appl. No. 18/407,357.
Int. Cl. F01N 3/04 (2006.01)
CPC F01N 3/046 (2013.01) 17 Claims
OG exemplary drawing
 
1. An exhaust assembly comprising:
an exhaust tube defining a central axis, the exhaust tube configured to direct an exhaust gas away from an engine to which the exhaust tube is fluidly connected; and
a coolant passage concentrically arranged about the exhaust tube, the coolant passage including an inner shell and an outer shell collectively defining a coolant volume,
wherein a first ratio of a first heat capacity of coolant in the coolant passage to a second heat capacity of metal forming the exhaust tube is greater than a first threshold so as to prevent boiling of the coolant in the coolant passage after engine shutdown.