US 12,281,606 B1
Cold start catalyst bypass system
Jeongyong Choi, Auburn Hills, MI (US); Michael A Barkey, Auburn Hills, MI (US); and William P Attard, Auburn Hills, MI (US)
Assigned to FCA US LLC, Auburn Hills, MI (US)
Filed by FCA US LLC, Auburn Hills, MI (US)
Filed on Aug. 30, 2024, as Appl. No. 18/820,571.
Int. Cl. F01N 3/20 (2006.01); B60W 10/10 (2012.01); F01L 1/34 (2006.01); F02D 23/02 (2006.01); F02D 29/02 (2006.01); F02D 43/04 (2006.01); F02P 5/15 (2006.01)
CPC F01N 3/2053 (2013.01) [B60W 10/10 (2013.01); F01L 1/34 (2013.01); F02D 23/02 (2013.01); F02D 29/02 (2013.01); F02D 43/04 (2013.01); F02P 5/15 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An internal combustion engine system, comprising:
an internal combustion engine including an intake camshaft and an exhaust camshaft;
a transmission;
a turbocharger including a compressor and a turbine;
a surge valve to allow intake air to selectively bypass the compressor;
a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine;
a light-off catalyst bypass system with a bypass valve configured to selectively provide exhaust gas to a bypass passage and a bypass catalytic converter; and
an emissions control system including a controller configured to operate in a cold catalyst mode, comprising:
monitoring, by the controller, a temperature of the main catalytic converter to determine if the temperature is below a predetermined light-off temperature;
moving, by the controller, the bypass valve to an open position to provide exhaust gas flow through the bypass passage and bypass catalytic converter when the main catalytic converter is below the predetermined light-off temperature; and
moving, by the controller, the surge valve to an open position to enable intake air to bypass the compressor to minimize pressure loss during the cold catalyst mode.