US 12,359,638 B2
Control of injection pressure for high pressure direct injection systems
Gabriele Catalano, Hagerstown, MD (US)
Assigned to VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed by VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed on Oct. 10, 2023, as Appl. No. 18/483,901.
Claims priority of application No. 22201877 (EP), filed on Oct. 17, 2022.
Prior Publication US 2024/0125280 A1, Apr. 18, 2024
Int. Cl. F02D 41/30 (2006.01); F02D 19/02 (2006.01); F02D 35/02 (2006.01); F02D 41/00 (2006.01); F02D 41/14 (2006.01); F02D 41/24 (2006.01)
CPC F02D 41/1401 (2013.01) [F02D 35/023 (2013.01); F02D 41/0027 (2013.01); F02D 41/2422 (2013.01); F02D 41/2467 (2013.01); F02D 2041/1433 (2013.01); F02D 2200/0602 (2013.01); F02D 2200/0802 (2013.01); F02D 2200/1002 (2013.01); F02D 2200/101 (2013.01); F02D 2250/36 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A computer-implemented method for controlling direct injection of hydrogen fuel into an engine cylinder of a vehicle from a hydrogen tank via an injector system, the method comprising:
determining a present hydrogen pressure in the hydrogen tank;
determining a present requested engine torque and speed;
determining a target injection pressure for injecting hydrogen into the engine combustion chamber using a model that includes at least:
a mapping of engine fuel consumption as a function of injection pressure;
a mapping between NOx emission as a function of injection pressure,
a mapping of in-cylinder pressure as a function of engine torque and speed;
a mapping of compressor mechanical work required to eject and compress hydrogen from the hydrogen tank as a function of injection pressure;
wherein, the target injection pressure is the injection pressure that, according to the model, minimizes the mechanical work of the compressor, that provides an in-cylinder pressure sufficient for the engine to provide the requested engine torque and speed, that provides NOx emission below a predetermined maximum NOx emission level, and that reduces engine fuel consumption,
wherein the method further comprises:
adjusting the injector pressure according to the determined target injection pressure.