VEHICLE-ELECTRICAL-SYSTEM ASSEMBLY AND METHOD FOR OPERATING A VEHICLE ELECTRICAL SYSTEM OF AN ELECTRICALLY DRIVABLE MEANS OF TRANSPORTATION HAVING A FUEL CELL

• US 20170225590A1
• Filed: 06/29/2015
• Published: 08/10/2017
• Est. Priority Date: 08/06/2014
• Status: Active Grant

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: SCHRDER, Hendrik, DVEL, Marc, WESS, Alexander, AKTAS, zgr
• Granted Patent: US 10,076,972 B2
• Time in Patent Office: Days
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/02 to electric heating circuits
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 58/30 for monitoring or controlling fuel cells
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

A vehicle-electrical-system assembly and a method for operating a vehicle electrical system of an electrically drivable transportation unit. The method includes determining a present electrical power consumption of a component having dynamic power-consumption behavior at a first time, providing a base value by smoothing the power-consumption behavior over time, defining a power reserve for the component by adding a static power offset to the base value, and limiting a vehicle-electrical-system power available for a traction machine of the transportation unit to provide the defined power reserve for the component.

Claims

1. A method for operating an electrically driven transportation vehicle electrical system, the method comprising:

ascertaining a current electrical power consumption of a traction machine of the electrically driven transportation vehicle with dynamic power consumption behavior at a first time;

providing a base value by smoothing the power consumption behavior over time;

defining a power reserve for the component by adding a static power offset to the base value; and

limiting a vehicle electrical system power available for the traction machine of the electrically driven transportation vehicle for providing the defined power reserve.

2. The method of claim 1, further comprising:

identifying that the current electrical power consumption of the traction machine at a second time is greater than the power reserve, and in response to this,

increasing the power reserve at least to a value corresponding to the current electrical power consumption of the component at the second time.

3. The method of claim 2, further comprising correcting the base value at those points at which the current electrical power consumption of the component at the second time is greater than the power reserve.

4. The method of claim 3, further comprising using the corrected base value at a later third time as a base value.

5. The method of claim 1, further comprising:

identifying a stationary operating state of the component, in which state the component consumes a maximum electrical power, and in response to this

reducing the power reserve, to the electrical power currently consumed by the component.

6. The method of claim 5, wherein the power reserve is reduced in increments over time.

7. The method of claim 5, wherein the power reserve is reduced after a predefined time period since the stationary operating state was identified.

8. The method of claim 5, wherein the power reserve is reduced continuously.

9. The method of claim 1, wherein the component is selected from the following list:

air-conditioning compressor,

turbocompressor,

screw-type compressor,

hydraulic assembly,

(PTC) heater,

electric motor,

power electronics system,

charging device.

10. The method of claim 1, wherein

electrical energy is supplied to the island electrical system by a fuel cell, and

the electrical component comprises an auxiliary assembly of the fuel cell in the form of a turbocompressor.

11. The method of claim 1, wherein, during smoothing, edge gradients of the power consumption behavior over time are reduced such that sections with a positive gradient are smoothed to a lesser extent than sections with a negative gradient.

12. An island electrical system arrangement for an electrically driven transportation vehicle, the arrangement comprising:

a component with dynamic power consumption behavior;

an electrical energy source for supplying the island electrical system;

a processing unit; and

a detection unit,

wherein the island electrical system arrangement;

ascertains a current electrical power consumption of a traction machine of the electrically driven transportation vehicle with dynamic power consumption behavior at a first time;

provides a base value by smoothing the power consumption behavior over time defining a power reserve for the component by adding a static power offset to the base value; and

limits a vehicle electrical system power available for the traction machine of the the electrically driven transportation vehicle for providing the defined power reserve.

13. An electrically driven transportation vehicle comprising an island electrical system arrangement as claimed in claim 12.