US 7,746,031 B2Granted

Monitoring device for power supply system

AssigneeToyota Jidosha Kabushiki Kaisha

InventorTeruo Ishishita

Life of this patent

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Abstract

A battery monitoring unit and sensors are supplied with a common operating supply voltage to operate. Detection values from sensors are sent to a control circuit by the battery monitoring unit. The control circuit monitors the operating supply voltage using a voltage sensor and additionally determines whether or not the detection values from the sensors before the relay connection falls within a normal range to more accurately detect a power supply reduction abnormality of the battery monitoring unit. Therefore, abnormalities can be detected accurately when the sensor and the battery monitoring unit provided for the secondary battery cannot operate normally due to a reduced operating supply voltage.

Claims12

Dependent claims

A monitoring device for a power supply system including a secondary battery, a load receiving power supply from said secondary battery, and a relay arranged between said secondary battery and said load, said monitoring device comprising:

a sensor for measuring a quantity of state of said secondary battery;
a battery monitoring unit supplied with an operating supply voltage common to said sensor and operating to monitor a state of said secondary battery;
first sensing means for sensing that a measurement value obtained by said sensor falls outside a prescribed normal range in a state before connection of said relay;
second sensing means for sensing that said operating supply voltage is below a prescribed operation guaranteed value of said battery monitoring unit;
and
abnormality sensing means for sensing an abnormality of said battery monitoring unit when said first sensing means senses that the measurement value obtained by said sensor falls outside said normal range before connection of said relay and when said second sensing means senses that said operating supply voltage is below said operation guaranteed value.

3 more elements

a sensor for measuring a quantity of state of said secondary battery;
a battery monitoring unit supplied with an operating supply voltage common to said sensor and operating to monitor a state of said secondary battery;
a first sensing portion sensing that a measurement value obtained by said sensor falls outside a prescribed normal range in a state before connection of said relay;
a second sensing portion sensing that said operating supply voltage is below a prescribed operation guaranteed value of said battery monitoring unit;
and
an abnormality sensing portion sensing an abnormality of said battery monitoring unit when said first sensing portion senses that the measurement value obtained by said sensor falls outside said normal range before connection of said relay and when said second sensing portion senses that said operating supply voltage is below said operation guaranteed value.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/884,009Filed 23 Feb 2006
Priority: JP 2005-07728417 Mar 2005
Published: US 2008/0129249 A15 Jun 2008
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02J 7/663
Including safety or protection arrangements: using battery or load disconnect circuits
G01R 35/00
Testing or calibrating of apparatus covered by the other groups of this
H01M 10/44
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: methods for charging or discharging
H01M 10/48
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators combined with arrangements for…

Family

US 2008/0129249 A1Pre-grant publication · published 5 Jun 2008
US 7,746,031 B2This patent

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

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