US 10,120,009 B2Granted

Ground-fault determination apparatus

AssigneeDenso Corporation

InventorsTomomichi Mizoguchi, Hayato Mizoguchi

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Abstract

A ground-fault determination apparatus, which is for use in a vehicle power supply system including a DC power source and a DC supply circuit, includes an acquisition unit that applies an AC signal to the DC supply circuit through a series connection of a resistor and a capacitor to acquire a peak value of the AC signal divided by a resistance of the resistor and an insulation resistance of the DC supply circuit, a ground-fault determination unit that determines presence of a ground-fault based on a comparison between a determination threshold and the peak value, an estimation unit that estimates at least one of a maximum output voltage of the DC supply circuit and a common capacitance between the DC supply circuit and a vehicle body, and a setting unit that sets the determination threshold based on at least one of the maximum output voltage and the common capacitance.

Claims8

Dependent claims

A ground-fault determination apparatus for use in a vehicle power supply system including a DC power source and a DC supply circuit having at least one electrical load which charges the DC power source or is charged by the DC power source, the DC power source and the DC supply circuit being insulated from a vehicle body, the ground-fault determination apparatus comprising:

a resistor;
a capacitor connected in series to the resistor and the DC supply circuit;
a processor connected to the DC supply circuit via a component of the resistor and capacitor series, the processor being configured to:
apply an AC signal to the DC supply circuit through the resistor and capacitor series to acquire a peak value of the AC signal divided by a resistance of the resistor and an insulation resistance of the DC supply circuit;
determine presence or absence of a ground-fault based on a comparison between a predetermined determination threshold and the acquired peak value;
estimate at least one of a maximum output voltage of the DC supply circuit and a common capacitance between the DC supply circuit and the vehicle body;
and
set a value of the determination threshold based on at least one of the maximum output voltage and the estimated common capacitance.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/982,635Filed 29 Dec 2015
Priority: JP 2015-0028579 Jan 2015
Published: US 2016/0202301 A114 Jul 2016
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01R 31/52
Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections: testing…
G01R 31/005
Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by…
G01R 31/007
On road vehicles, e.g. automobiles or trucks: using microprocessors or computers
G01R 31/42
Testing power supplies: aC power supplies

Family

US 2016/0202301 A1Pre-grant publication · published 14 Jul 2016
US 10,120,009 B2This patent

From the US filing history. Foreign family members aren’t listed.

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