Method for Preparation for the Start of a Parked Fuel Cell System

Patent metadata

Field	Value
Publication number	US-2021305601-A1
Application number	US-201917269757-A
Country	US
Kind code	A1
Filing date	Aug 14, 2019
Priority date	Aug 21, 2018
Publication date	Sep 30, 2021
Grant date	—

Abstract

A method for the start preparation of a fuel cell system in a vehicle having a fuel cell and a system bypass where an air flow is conveyed by parts of the fuel cell system in order to dry the fuel cell. In a first temporal phase of the method, a larger part of the air flow is led through the fuel cell and a smaller part of the air flow is led through the system bypass, after which, in a second temporal phase, a larger part of the air flow is led through the system bypass and a smaller part of the air flow is led through the fuel cell.

First claim

1 .- 10 . (canceled)

11 . A method of a start preparation routine of a fuel cell system in a vehicle, wherein the fuel cell system has a fuel cell and a system bypass, comprising the steps of:
conveying a larger part of an air flow through the fuel cell and a smaller part of the air flow through the system bypass in a first temporal phase; and conveying a larger part of the air flow through the system bypass and a smaller part of the air flow through the fuel cell in a second temporal phase which is after the first temporal phase.

12 . The method according to claim 11 , wherein a heating device in the fuel cell system is operated before the first temporal phase in a heating phase.

13 . The method according to claim 12 , wherein the heating device is operated until an end of the second temporal phase.

14 . The method according to claim 11 , wherein the air flow at a start of the first temporal phase is increased to a constant pressure and is held at the constant pressure until an end of the second temporal phase.

15 . The method according to claim 11 , wherein a cathode side of the fuel cell system is flowed through with the air flow.

16 . The method according to claim 11 , wherein during the first temporal phase and the second temporal phase, an anode chamber of the fuel cell is provided with hydrogen at a pulsating pressure when an anode outlet valve is open.

17 . The method according to claim 16 , wherein the air flow at a start of the first temporal phase is increased to a constant pressure and is held at the constant pressure until an end of the second phase and wherein the pulsating pressure is set to a value of the constant pressure.

18 . The method according to claim 17 , wherein an average of the pulsating pressure is greater than or equal to the value of the constant pressure.

19 . The method according to claim 11 , wherein a start of the first temporal phase depends on a temperature threshold value.

20 . The method according to claim 12 , wherein a start of the heating phase depends on a temperature threshold value and wherein the first temporal phase is started depending on a time after the start of the heating phase.

Assignees

• Daimler Ag

Inventors

• Pastor Nigorra Pere Antoni
• Schmalzriedt Sven
• Muetschele Armin

Classifications

• H01M8/04007

  related to heat exchange · CPC title

• H01M8/04225

  during start-up · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M8/04302 Primary

  applied during start-up · CPC title

• H01M8/04052

  Storage of heat in the fuel cell system · CPC title