US 12,188,404 B1
Electric turbocharger emissions control
Kenneth E Hardman, Clarkston, MI (US); and Ryan M Sturgeon, Rochester Hills, MI (US)
Assigned to FCA US LLC, Auburn Hills, MI (US)
Filed by FCA US LLC, Auburn Hills, MI (US)
Filed on Dec. 19, 2023, as Appl. No. 18/544,510.
Int. Cl. F02B 37/04 (2006.01); F02B 37/18 (2006.01); F02D 23/00 (2006.01)
CPC F02B 37/18 (2013.01) [F02B 37/04 (2013.01); F02D 23/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A control system for an engine having an electric turbocharger, the control system comprising:
a wastegate system having a wastegate valve configured to variably open and close to control a flow of exhaust gas in an exhaust system of the engine at a turbine of the electric turbocharger; and
a controller configured to:
obtain a set of parameters including an exhaust flow rate through the exhaust system;
using the set of parameters:
(i) determine, based on the exhaust flow rate through the exhaust system, a desired speed of the electric turbocharger to satisfy no flow of the exhaust gas through the turbine;
(ii) command the electric turbocharger to rotate in a reverse direction at the desired speed to achieve no flow of the exhaust gas through the turbine;
(iii) determine whether an exhaust gas treatment system (ETS) has reached a desired temperature; and
(iv) command the electric turbocharger to rotate in a forward direction based on the ETS reaching the desired temperature.