Patent ID: 11959951
Assignee: RENAULT S.A.S.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A method for determining an insulation resistance between a point on a high-voltage battery of an electric or hybrid vehicle and the body of the vehicle, comprising:
providing a controllable DC voltage source connected to the body and to a single first terminal of the battery,
providing a first resistor connected in series with said voltage source between the single first terminal and the body, configured to limit a current incoming over the single first terminal of the battery,
providing a second resistor connected in series between the first resistor and said voltage source,
providing a measurement device configured to measure the voltage across the terminals of the second resistor,
applying, by said voltage source, different successive voltage setpoint values between the body and the single first terminal of the battery,
acquiring, by said measurement device, a voltage measurement signal representative of the measurements of the voltage across the terminals of said second resistor for each voltage setpoint value applied successively,
calculating a value of the insulation resistance based on said voltage measurement signal,
adaptive filtering of the voltage measurement signal,
estimating, in a recursive manner, a vector of the transfer function coefficients of the adaptive filter, and
providing an update of the filtering coefficients, the insulation resistance value being calculated on the basis of said estimate.