公开(公告)号：US11921138B2

公开(公告)日：2024-03-05

申请号：US17340906

申请日：2021-06-07

Applicant: DENSO CORPORATION

Inventor： Masakazu Kouda ,  Ryota Kubokawa ,  Yusuke Shindo ,  Toru Wakimoto

IPC: G01R27/02 ,  B60L3/00 ,  G01R27/18 ,  G01R31/52

CPC classification number: G01R27/025 ,  B60L3/0046 ,  G01R27/18 ,  G01R31/52

Abstract: An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.

公开(公告)号：US11874339B2

公开(公告)日：2024-01-16

申请号：US17337957

申请日：2021-06-03

Applicant: DENSO CORPORATION

Inventor： Ryota Kubokawa ,  Masakazu Kouda ,  Toru Wakimoto ,  Yusuke Shindo ,  Akira Sumi

IPC: G01R31/52 ,  G01R27/18

CPC classification number: G01R31/52 ,  G01R27/18

Abstract: In an insulation resistance detection apparatus, a voltage determiner determines whether a detection voltage, which has changed by at least a preset value, becomes stable at around a changed voltage value. A resistance determiner determines a value of an insulation resistance between a ground portion and a power-supply path based on a currently sampled value of the detection voltage instead of a moving average in response to determination that the detection voltage, which has changed by at least the preset value, becomes stable at around the changed voltage value.