Patent ID: 11894588
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 18:
19. The process as recited in claim 17, further comprising:
determining, using the at least one processor, a rate of change of the pressure drop of the coolant;
comparing, using the at least one processor, the rate of change of the pressure drop to a calibratable threshold;
defining the delta temperature feedback as a measured delta temperature based on the temperature signal, in response to the at least one processor determining that the rate of change of the pressure drop is less than the calibratable threshold; and
defining the delta temperature feedback as an estimated delta temperature based on the pressure signal, in response to the at least one processor determining that the rate of change of the pressure drop is above the calibratable threshold;
wherein setting the delta temperature feedback as the estimated delta temperature comprises:
determining, using the at least one processor, a waste heat generated by the fuel cell stack based on an ideal voltage from the fuel cell stack, an actual voltage from the fuel cell stack, an actual current generated by the fuel cell stack, and a latent heat;
determining, using the at least one processor, an estimated flow rate of the coolant through the coolant passage based on the pressure drop, a coefficient of laminar flow associated with the coolant, a viscosity of the coolant at the average temperature of the coolant, a coefficient of turbulent flow associated with the coolant, and the density of the coolant; and
determining, using the at least one processor, the estimated delta temperature based on the waste heat, the estimated flow rate, a density of the coolant, and a specific heat capacity of the coolant.