US 12,264,610 B1
Cold start catalyst bypass system
Jeff Brand, Highland, MI (US); John D Frederick, Rochester Hills, MI (US); and Kenneth E Hardman, Clarkston, MI (US)
Assigned to FCA US LLC, Auburn Hills, MI (US)
Filed by FCA US LLC, Auburn Hills, MI (US)
Filed on Jan. 29, 2024, as Appl. No. 18/425,038.
Int. Cl. F01N 3/20 (2006.01); F01N 3/28 (2006.01); F02B 37/12 (2006.01); F02B 39/10 (2006.01)
CPC F01N 3/2006 (2013.01) [F01N 3/2892 (2013.01); F02B 37/12 (2013.01); F02B 39/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of operating an internal combustion engine system that comprises:
an internal combustion engine;
a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine;
a turbocharger turbine selectively rotatable in a first direction for a normal operation and an opposite second direction for a reverse rotation operation; and
a light-off catalyst bypass system with a bypass passage and a bypass catalytic converter configured to selectively receive exhaust gas from the internal combustion engine and bypass the turbine, wherein the bypass passage is absent a valve configured to selectively allow flow through the bypass passage, the method comprising:
monitoring, by a controller having one or more processors, a temperature of the main catalytic converter to determine if the temperature is below a predetermined light-off temperature;
rotating, by the controller, the turbine in the second direction when the temperature is below the predetermined light-off temperature to restrict or prevent exhaust gas from flowing through the turbine to facilitate directing the exhaust gas through the bypass passage and the bypass catalytic converter; and
rotating, by the controller, the turbine in the first direction when the temperature exceeds the predetermined light-off temperature to enable exhaust gas to flow through the turbine.