FUEL CELL POWER CONTROL BY OFFSET ESTIMATION

摘要

A system and method for managing power flow in a fuel cell vehicle. The method provides a difference between a power limit signal and an actual power signal to a PI controller to generate a power offset signal. The method determines whether a fuel cell stack is able to provide enough power to satisfy a power request, and if so, adds the power request and the power offset signal to generate a stack power request signal to cause the upper power limit signal to move towards and be matched to the actual power signal. If the stack is not able to provide enough power to satisfy the load power request signal, the method subtracts the power offset signal from the power limit signal to provide a load limit signal to cause the actual stack power signal to move towards and be matched to the upper power limit signal.

主权项

1. A method for providing power control in a fuel cell system, said fuel cell system including a fuel cell stack and controlled and uncontrolled system loads, said method comprising:
providing power from the fuel cell stack on a power bus to power the system loads; measuring the power on the power bus to provide an actual stack power signal; providing a difference between an upper power limit signal and the actual power stack signal to a controller to generate a power offset signal; determining whether the fuel cell stack is able to provide enough power to satisfy a load power request signal; adding the load power request signal and the power offset signal to generate a stack power request signal and causing the upper power limit signal to move towards and be matched to the actual stack power signal if the fuel cell stack is able to provide enough power to satisfy the load power request signal; and subtracting the power offset signal and the upper power limit signal to provide a first power limit signal to limit the power draw of the controlled system loads so that the actual stack power signal moves towards and is matched to the upper power limit signal if the fuel cell stack is not able to provide enough power to satisfy the load power request signal.