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US 2019/0293724 A1Published application
Determination of the insulation resistance of a fuel-cell system
AssigneeAudi AG
InventorsKai MÜLLER, Friedrich WILHELM, Stefan LÄNGLE
Life of this patent
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Abstract
The present disclosure relates to a method and a device for determining the insulation resistance of a fuel-cell system.
Claims5
A method for determining the insulation resistance of an HV system in a vehicle, which comprises a fuel-cell system cooled with a fuel-cell coolant, comprising:
- measuring an insulation resistance RISO of the HV system to ground;
- and
- from the measured insulation resistance RISO, by way of a compensation term RBZKM Modell(T,e−), which compensates for changes in the conductivity of the fuel-cell coolant due to temperature changes and/or changes in the number of ions in the coolant and/or in the concentration of contaminants in the coolant, determining a corrected insulation resistance of the HV system RISO korr according to:
- 1
- R
- ISO
-
-
- korr
- =
- 1
- R
- ISO
- +
- 1
- R
- BZKM
-
-
- Modell
-
- (
- T
- ,
- e
- -
- )
- .
25 more elements
A method for checking the operational safety of an HV system in a vehicle, which comprises a fuel-cell system cooled with a fuel-cell coolant, comprising:
- determining an insulation resistance RISO of the HV system to ground;
- comparing the determined insulation resistance RISO against a threshold value for the insulation resistance;
- and
- identifying an unsafe operating state of the HV system when the determined insulation resistance falls below the threshold value, wherein a corrected insulation resistance RISO korr is used to judge whether the HV system is in a safe operating state, the corrected insulation resistance RISO korr determined according to:
- 1
- R
- ISO
-
-
- korr
- =
- 1
- R
- ISO
- +
- 1
- R
- BZKM
-
-
- Modell
-
- (
- T
- ,
- e
- -
- )
- ,
- wherein RBZKM Modell(T,e−) is a compensation term, which compensates for changes in the conductivity of the fuel-cell coolant due to temperature changes and/or changes in the number of ions in the coolant and/or in the concentration of contaminants in the coolant.
27 more elements
A device for determining the insulation resistance of a HV system in a vehicle, which comprises a fuel-cell system cooled with a fuel-cell coolant, comprising:
- a fuel-cell controller, configured to determine, from a measured insulation resistance RISO of the HV system, by way of a compensation term RBZKM Modell(T,e−), which compensates for changes in the conductivity of the fuel-cell coolant due to temperature changes and/or changes in the number of ions in the coolant and/or in the concentration of contaminants in the coolant, a corrected insulation resistance of the HV system RISO korr according to
- 1
- R
- ISO
-
-
- korr
- =
- 1
- R
- ISO
- +
- 1
- R
- BZKM
-
-
- Modell
-
- (
- T
- ,
- e
- -
- )
- .
23 more elements
Dependencies are inferred from the claim text.