Vehicle power supply system

Abstract

The vehicle power generation system, which is mounted on a vehicle having an internal combustion engine as a travel drive power source, and a cooling device for cooling the internal combustion engine by use of coolant containing one of alcohol and ether, includes a fuel cell generating electric energy by electrochemical reaction between one of alcohol and ether as fuel and oxidant in the fuel cell, and a fuel supply device operating to supply one of alcohol and ether contained in the coolant to the fuel cell.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings:

FIG. 1 is a diagram explaining an overall structure of a vehicle power generation system according to a first embodiment of the invention, which is mounted on a vehicle;

FIG. 2 is a diagram showing a structure of a fuel cell unit included in the vehicle power generation system shown in FIG. 1;

FIG. 3 is a diagram schematically showing a main part of a fuel cell included in the fuel cell unit shown in FIG. 2;

FIG. 4 is a diagram showing a structure of a voltage conversion circuit of a control unit included in the vehicle power generation system shown in FIG. 1;

FIG. 5 is a diagram explaining an overall structure of a vehicle power generation system according to a third embodiment of the invention;

FIG. 6 is a diagram showing a structure of a voltage conversion circuit of a control unit included in the vehicle power generation system according to a fourth embodiment of the invention;

FIG. 7 is a diagram explaining an overall structure of a vehicle power generation system according to a fifth embodiment of the invention;

FIG. 8 is a diagram explaining an overall structure of a vehicle power generation system according to a sixth embodiment of the invention; and

FIG. 9 is a diagram explaining an overall structure of a vehicle power generation system according to a seventh embodiment of the invention.

Claims

1. A vehicle power generation system mounted on a vehicle having an internal combustion engine as a travel drive power source, and a cooling device for cooling said internal combustion engine by use of coolant containing one of alcohol and ether, said vehicle power generation system comprising: a fuel cell generating electric energy by electrochemical reaction between one of alcohol and ether as fuel and oxidant in said fuel cell; anda fuel supply device operating to supply one of alcohol and ether contained in said coolant to said fuel cell.

2. The vehicle power generation system according to claim 1, wherein said fuel cell is configured to generate electric energy by electrochemical reaction between one of ethylene glycol, diethylene glycol, and triethylene glycol.

3. The vehicle power generation system according to claim 1, wherein said fuel supply device includes a separating device for separating ethylene glycol from ethylene glycol-containing coolant.

4. The vehicle power generation system according to claim 3, wherein said separating device includes a separation membrane allowing water to pass therethrough, and not allowing ethylene glycol to pass therethrough.

5. The vehicle power generation system according to claim 4, wherein said separating device includes a vibrator section for vibrating said separation membrane.

6. The vehicle power generation system according to claim 4, wherein said separating device includes a vibrator section for vibrating said coolant in said vibrating device.

7. The vehicle power generation system according to claim 1, wherein said fuel cell is configured to supply said electric energy generated by said electrochemical reaction to at least one of a rechargeable battery mounted on said vehicle to accumulate electric power required to start said internal combustion engine, and an electrical load consuming electric power while said internal combustion engine is stopped.

8. The vehicle power generation system according to claim 7 further comprising a control unit controlling supply one of alcohol and ether from said fuel supply device to said fuel cell such that said supply is started when a predetermined condition is satisfied.

9. The vehicle power generation system according to claim 8, wherein said predetermined condition is a lapse of a predetermined time from, when said internal combustion engine stops.

10. The vehicle power generation system according to claim 8, wherein said predetermined condition is that said internal combustion engine is in a stopped state.

11. The vehicle power generation system according to claim 7, wherein said fuel cell is constituted by a plurality of fuel-cell cells electrically connected in series.

12. The vehicle power generation system according to claim 7, further comprising voltage conversion circuit stepping up a generation voltage of said fuel cell.

13. The vehicle power generation system according to claim 11, wherein said voltage conversion circuit includes a plurality of voltage stepup circuits to step up said generation voltage in multiple stages.

14. The vehicle power generation system according to claim 12, wherein said voltage conversion circuit is configured to operate on electric power supplied from said rechargeable battery.

15. A vehicle power generation system mounted on a vehicle having an internal combustion engine as a travel drive power source, and a cooling device for cooling said internal combustion engine by use of coolant containing one of ethylene glycol, diethylene glycol, and triethylene glycol; said vehicle power generation system comprising: a fuel cell generating electric energy by electrochemical reaction between hydrogen as fuel and oxidant in said fuel cell; anda fuel supply device reforming said coolant to produce hydrogen, and supplying said produced hydrogen to said fuel cell.

16. The vehicle power generation system according to claim 15, wherein said fuel cell is configured to supply said electric energy generated by said electrochemical reaction to at least one of a rechargeable battery mounted on said vehicle to accumulate electric power required to start said internal combustion engine, and an electrical load consuming electric power while said internal combustion engine is stopped.

17. The vehicle power generation system according to claim 15 further comprising a control unit controlling supply of hydrogen from said fuel supply device to said fuel such that supply of said supply is started when a predetermined condition is satisfied.

18. The vehicle power generation system according to claim 17, wherein said predetermined condition is a lapse of a predetermined time from stop said internal combustion engine.

19. The vehicle power generation system according to claim 17, wherein said predetermined condition is that said internal combustion engine is in a stopped state.

20. The vehicle power generation system according to claim 15, wherein said fuel cell is constituted by a plurality of fuel-cell cells electrically connected in series.

21. The vehicle power generation system according to claim 15, further comprising voltage conversion circuit stepping up a generation voltage of said fuel cell.

22. The vehicle power generation system according to claim 21, wherein said voltage conversion circuit includes a plurality of voltage stepup circuits to step up said generation voltage in multiple stages.

23. The vehicle power generation system according to claim 21, wherein said voltage conversion circuit is configured to operate on electric power supplied from said rechargeable battery.