Method for Power Control of a Fuel Cell System in a Vehicle

Patent metadata

Field	Value
Publication number	US-2018108928-A1
Application number	US-201615565042-A
Country	US
Kind code	A1
Filing date	Mar 2, 2016
Priority date	Apr 9, 2015
Publication date	Apr 19, 2018
Grant date	—

Abstract

A method for power control of a fuel cell system in a vehicle is disclosed. The requested fuel cell system power by the vehicle is converted into a power request made of the fuel cell by an expected power of auxiliary drives of the fuel cell system at the requested fuel cell system power being added to the requested fuel cell system power. A media supply of the fuel cell which corresponds to the power request made of the fuel cell is requested. The electrical loading of the fuel cell with current is performed in accordance with a model of the cathode dynamics such that a control variable of the control operation is matched to the media dynamics, and the power release is performed such that the fuel cell is loaded only when the adequate media supply is ensured.

First claim

1 .- 10 . (canceled)

11 . A method for power control of a fuel cell system in a vehicle, comprising the steps of:
providing fuel cell system power (PFCS) starting from a requested fuel cell system power (PVEH,soll) by the vehicle; wherein the requested fuel cell system power (PVEH,soll) is converted into a power request (PFC,soll) made of the fuel cell by adding an expected power (PAUX,soll) of auxiliary drives of the fuel cell system at the requested fuel cell system power (PVEH,soll) to the requested fuel cell system power (PVEH,soll); wherein a media supply of the fuel cell which corresponds to the power request (PFC,soll) made of the fuel cell is requested; wherein electrical loading of the fuel cell with current (IFC) is performed in accordance with a model of cathode dynamics such that a control variable of a control operation is matched to media dynamics and wherein power release is performed such that the fuel cell is loaded only when adequate media supply is ensured; and wherein the expected power (PAUX,soll) of the auxiliary drives of the fuel cell system is determined by a characteristic field as a function of at least one of a variable of power, pressure and/or temperature.

12 . The method according to claim 11 , wherein the characteristic field is re-adapted in a static mode of the fuel cell system.

13 . The method according to claim 11 , wherein, in a case of a request for the media supply, pressure and either mass flow or volume flow of a respective medium are predetermined.

14 . The method according to claim 13 , wherein the request for the media supply takes place on a basis of a current setpoint (IFC,soll) of the power request (PFC,soll) made of the fuel cell.

15 . The method according to claim 14 , wherein the current setpoint (IFC,soll) is determined by a polarization curve of the fuel cell from the power request (PFC,soll) made of the fuel cell.

16 . The method according to claim 15 , wherein the polarization curve is approximated linearly under at least one predetermined condition.

17 . The method according to claim 14 , wherein air mass flow to a cathode is measured and the current setpoint (IFC,soll) is limited on a basis of the measured air mass flow.

18 . The method according to claim 14 , wherein the current setpoint (IFC,soll) passed to the media supply is adapted to a current value (lFC) drawn from the fuel cell if the vehicle does not take off the current or does not take off the current completely.

19 . The method according to claim 15 , wherein the current setpoint (IFC,soll) transmitted to the media supply and/or a setpoint for a current load of the fuel cell are limited such that a permitted operating range (OR) in a diagram of the polarization curve of the fuel cell, starting from a point of maximum power (PFC,max), is in a direction of higher current intensities or in a direction of lower current intensities (lFC).

Assignees

• Daimler Ag

Inventors

• Wiesner Peter
• Schmalzriedt Sven

Classifications

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• B60L11/1883

  Operations & Transport · mapped topic

• H01M8/04619

  of fuel cell stacks · CPC title

• H01M8/04753

  of fuel cell reactants · CPC title

• H01M8/04992 Primary

  characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence · CPC title