US 11,852,091 B1
Idle mode for engines with port fueld injection (PFI) and direct injection (DI) fuel systems
J. Michael Gwidt, Brighton, MI (US); and Matthew D. Defever, Berkley, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Aug. 24, 2022, as Appl. No. 17/822,007.
Int. Cl. F02D 41/16 (2006.01); F02D 41/38 (2006.01); F02D 41/14 (2006.01); F02D 41/32 (2006.01)
CPC F02D 41/16 (2013.01) [F02D 41/1498 (2013.01); F02D 41/32 (2013.01); F02D 41/38 (2013.01); F02D 2041/389 (2013.01); F02D 2200/1012 (2013.01); F02D 2200/501 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling operation of an engine of a vehicle during an idle mode of operation for the engine, the engine having a plurality of different types of fuel injectors and a combustion chamber, the plurality of different types of fuel injectors comprising a port fuel injector and a direct fuel injector, the method comprising:
obtaining, via one or more first sensors of the vehicle, first sensor data as to a speed of the vehicle;
obtaining, via one or more second sensors of the vehicle, second sensor data as to a measure of roughness of the engine; and
adjusting, via instructions provided by a processor of the vehicle, a fuel injection ratio of respective amounts of fuel provided by the plurality of different types of fuel injectors to the combustion chamber, based on both the speed of the vehicle and the measure of roughness of the engine, wherein the adjusting of the fuel injection ratio comprises adjusting the fuel injection ratio of the respective amounts of fuel provided by the port fuel injector and the direct fuel injector, respectively, based on both the speed of the vehicle and the measure of roughness of the engine, including by increasing a ratio of (a) fuel provided by the port fuel injector to the combustion chamber to (b) a total fuel provided by the port fuel injector and the direct fuel injector combined to the combustion chamber (the “PDI Ratio”) from an initial value to an increased value, when the speed of the vehicle is less than a non-zero predetermined threshold, wherein the non-zero predetermined threshold is greater than or equal to approximately five miles per hour (mph).