US 12,331,672 B2
Dual-acting valve enabled catalyst bypass
Jeff Brand, Highland, MI (US); Michael P Schmidt, Highland, MI (US); David A Scott, Holly, MI (US); and Philip J Insalaco, Fenton, MI (US)
Assigned to FCA US LLC, Auburn Hills, MI (US)
Filed by FCA US LLC, Auburn Hills, MI (US)
Filed on Apr. 28, 2023, as Appl. No. 18/309,382.
Claims priority of provisional application 63/343,839, filed on May 19, 2022.
Prior Publication US 2023/0374926 A1, Nov. 23, 2023
Int. Cl. F01N 3/20 (2006.01); F16K 1/20 (2006.01)
CPC F01N 3/2053 (2013.01) [F16K 1/2007 (2013.01); F01N 2410/06 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An internal combustion engine comprising:
a cylinder head with an exhaust manifold configured to supply exhaust gas through a main exhaust outlet to a main exhaust aftertreatment system having a main catalytic converter,
a main outlet duct configured to receive exhaust gas flow from the exhaust manifold and define the main exhaust outlet:
a bypass passage in fluid communication with the exhaust manifold via a bypass port;
a bypass catalytic converter disposed within the bypass passage; and
a dual-acting valve assembly configured to move between a first position that seals the bypass port, and a second position that seals the main exhaust outlet,
wherein during cold start, long idle, and/or low main catalytic converter temperature conditions, the dual-active valve assembly is moved to the second position to direct exhaust flow through the bypass passage and the bypass catalytic converter to reduce emissions,
wherein the main outlet duct includes a recessed first valve seat formed around the bypass port, and
wherein in the first position, the dual-acting valve assembly is configured to seat flush within the recessed first valve seat to facilitate preventing obstruction of exhaust gas flow within the main outlet duct;
wherein the bypass passage is integrally formed within the cylinder head, and wherein the bypass catalytic converter is disposed within the bypass passage within the cylinder head.