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

Claim 9:
10. A device 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:
a detection circuit for detecting an insulation fault between the battery and the body, the detection circuit comprising a controllable DC voltage source, configured to apply a voltage setpoint between a single first terminal of the battery and the body, 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, a second resistor connected in series between the first resistor and said voltage source and a measurement device configured to measure the voltage across the terminals of the second resistor; and
a control unit configured to controlling the application, by said voltage source, of different successive voltage setpoint values between the body and the single first terminal of the battery, of 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, and of calculating a value of the insulation resistance on the basis of said voltage measurement signal, wherein said control unit comprises an adaptive filtering module configured to implement the method as claimed in claim 1.