PEM fuel cell auxiliary power system and method for starting an internal combustion engine vehicle

• US 20090301802A1
• Filed: 06/05/2008
• Published: 12/10/2009
• Est. Priority Date: 06/05/2008
• Status: Abandoned Application

• Current Assignee: Bayerische Motoren Werke AG, United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX), Audi AG (Volkswagen AG)
• Original Assignee: Audi AG (Volkswagen AG)
• Inventors: LaRocco, Melanie A., Falkenberg, Ingo, Steinbugler, Margaret M., Strobl, Wolfgang
• Application Number:
  US12/156,798
• Publication Number:
  US 20090301802A1
• Time in Patent Office: Days
• US Class Current: 180/65.310
• CPC Class Codes: F02N 11/0866 comprising several power sources, e.g. battery and capacitor or two batteries
• CPC Class Codes: F02N 2011/0888 DC/DC converters
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An internal combustion engine vehicle includes a compact light weight PEM fuel cell auxiliary power system (2) which is used to provide electrical power for operating the vehicle starter (10) to start the vehicle, and for operating additional electrical equipment while the vehicle is running, or before the vehicle is running. A small light weight dry cell battery (4) is included in the vehicle for supplying startup power for the PEM fuel cell auxiliary power system. The conventional heavy and bulky twelve volt battery is not needed in the vehicle thereby eliminating the weight and size of the twelve volt battery from the vehicle. A bank of super capacitors (18) can be included in the vehicle which are operatively connected to the PEM fuel cell auxiliary power system and to the starter. The super capacitors can be charged by the PEM fuel cell auxiliary power system during operation of the vehicle, and can be activated to provide startup electrical power to the starter along with the PEM fuel cell auxiliary power system so as to start the vehicle in adverse ambient conditions, such as during subfreezing weather.

Claims

1. A system for starting an internal combustion engine-powered vehicle, said system comprising:

a) a PEM fuel cell auxiliary power system (2) mounted in the vehicle;

b) a small light weight battery (4) providing a maximum discharge current of about 20 amperes and an electrical power of about only about 200 watts for providing start up power for said PEM fuel cell auxiliary power system; and

c) a starter (10) operatively connected to said PEM fuel cell auxiliary power system whereby electrical power from said PEM fuel cell auxiliary power system can be directed to said starter to activate the latter to start the vehicle engine.

2. The system of claim 1 further comprising a converter (8) operatively connected to said PEM fuel cell auxiliary power system for converting the voltage output of said PEM fuel cell auxiliary power system to twelve volt output;

3. The system of claim 1 wherein said PEM fuel cell auxiliary power system produces about forty two volts at full power.

4. The system of claim 1 further comprising at least one supplemental source (18) of electrical power selectively connected to said starter, said supplemental source being activated when power from said converter is insufficient by itself to start the vehicle engine.

5. The system of claim 4 wherein said supplemental source of electrical power includes one or more capacitors.

6. The system of claim 5 wherein said capacitors are super capacitors.

7. The system of claim 6 wherein said supplemental source includes three super capacitors.

8. A method for energizing an internal combustion engine-powered vehicle starter so as to start the vehicle, said method comprising:

a) the step of providing a PEM fuel cell auxiliary power system (2) mounted in the vehicle;

b) the step of powering up said PEM fuel cell auxiliary power system so as to provide voltage output therefrom; and

c) the step of using the voltage output from said PEM fuel cell auxiliary power system to energize the vehicle starter (10) so as to start the vehicle engine.

9. The method of claim 8 further including the step of converting the voltage output from said PEM fuel cell auxiliary power system to twelve volts;

10. The method of claim 8 further comprising the step of producing about forty two volts with said PEM fuel cell auxiliary power system.

11. The method of claim 8 further comprising the step of activating at least one supplemental source (18) of electrical power selectively connected to said starter when power from said PEM fuel cell auxiliary power system is insufficient by itself to start the vehicle engine.

12. The method of claim 11 wherein said supplemental source of electrical power includes one or more capacitors.

13. The method of claim 12 wherein said capacitors are super capacitors.

14. The method of claim 13 wherein said supplemental source includes three super capacitors.