JP2007099028A - Method and device for determining deterioration of storage battery for starting engine, and storage battery for starting engine with deterioration determining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely determine the deterioration of a storage battery for reflecting the startability of an engine using the pulsation of a voltage at the time of starting the engine. <P>SOLUTION: In determining the deterioration of a storage battery for starting the engine for supplying power to a cell motor for starting the engine, the pulsation of a voltage of the storage battery generated at the time of driving the cell motor is monitored, and an initial voltage bottom value VS1 immediately after the cell motor is started, and a n-th voltage bottom value VSn after the first time are measured so as to compare VS1 and VSn for determining the deterioration of the storage battery. For example, deterioration is determined according to a difference ΔVn(=VSn-VS1) of VSn and VS1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a storage battery deterioration determination device used for starting an engine such as a vehicle, and an engine start storage battery including the deterioration determination device.

  Lead storage batteries are mainly used as engine starting storage batteries including automobile storage batteries, and power is supplied to auxiliary machines such as cell motors for engine starting and lights. As a method for determining deterioration of an engine starting storage battery, a method based on an open circuit voltage of the storage battery or a discharge voltage at a predetermined load, or a method based on an electrolyte specific gravity (dilute sulfuric acid concentration) is widely used.

  Although these methods can grasp the deterioration state of the lead storage battery to a certain extent, except for open circuit voltage measurement, a dedicated discharge device and specific gravity measuring device are required, and general vehicle owners can easily deteriorate the storage battery. It is difficult to distinguish.

As a method for a general vehicle owner to easily determine the deterioration of the storage battery, Patent Document 1 discloses a state determination device attached to the storage battery to determine the engine start / running (operation) / stop state of the vehicle. The storage battery voltage in each state is used to determine whether the battery is deteriorated or discharged, or the vehicle is abnormal, and the storage battery voltage value at the start of the cell motor at the engine start or the voltage difference between this voltage and the open circuit voltage. State discrimination is shown.
JP 2003-327061 A

  However, in the storage battery state determination device of Patent Document 1, the engine starting voltage changes due to the influence of charging polarization depending on the state before the engine is started, for example, immediately after the engine is stopped or whether time has elapsed since the engine is stopped. As a result, the accuracy of state determination decreases.

  Also, since the engine starting voltage and the startable storage battery lower limit voltage differ depending on the type of engine, the deterioration of the storage battery can be accurately determined from the storage battery voltage value at the time of starting the cell motor as described above or the voltage difference between this voltage and the open circuit voltage. There was a problem that it was difficult to do.

  In order to solve the above-described problem, the invention according to claim 1 is a method for determining deterioration of an engine starting storage battery that supplies electric power to an engine starting cell motor. In the storage battery voltage pulsation generated when the cell motor is driven, A method for determining the deterioration of the storage battery for starting the engine by measuring the first voltage bottom value VS1 and the second and subsequent nth voltage bottom value VSn and comparing the VS1 and VSn to determine the deterioration of the storage battery. It is.

  Further, the invention according to claim 2 of the present invention is the method for determining deterioration of a storage battery for engine starting according to claim 1, wherein the deterioration of the storage battery is determined according to a difference ΔVn (= VSn−VS1) between VSn and VS1. Features.

  Further, the invention according to claim 3 of the present invention is characterized in that, in the deterioration determination method for the engine starting storage battery according to claim 1 or 2, the minimum value of the storage battery voltage measured over a predetermined time from the detection of VS1 is VSn. To do.

  Furthermore, the invention according to claim 4 of the present invention is a deterioration determination device for an engine starting storage battery that supplies electric power to an engine starting cell motor. In the storage battery voltage pulsation generated when the cell motor is driven, the initial voltage immediately after the cell motor is started. A voltage measurement unit that measures a bottom value VS1 and an n-th voltage bottom value VSn that is the second or later time, and a determination unit that compares VS1 and VSn to determine deterioration of a storage battery. 1 shows a deterioration determination device for an engine starting storage battery.

  Further, in the invention according to claim 5 of the present invention, in the deterioration determination device for the engine starting storage battery according to claim 4, the determination means causes the storage battery to deteriorate according to the difference ΔVn (= VSn−VS1) between VSn and VS1. It is characterized by discriminating.

  Further, the invention according to claim 6 of the present invention is the deterioration determination device for the engine starting storage battery according to claim 4 or 5, wherein the minimum value of the storage battery voltage measured over a predetermined time from the VS1 detection by the voltage measuring means is obtained. It is characterized by being VSn.

  An invention according to claim 7 of the present invention shows an engine start storage battery that is integrally provided with the engine start storage battery deterioration determination device according to any one of claims 4, 5, or 6.

  By having the above-described configuration, the present invention compares the initial voltage bottom value at the time of engine startup with the nth voltage bottom value for the second and subsequent times, particularly in various vehicles. From this viewpoint, it is possible to determine the deterioration of the storage battery with high accuracy.

  Hereinafter, a deterioration determination device and a deterioration determination method for an engine starting storage battery according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a state in which a deterioration determining device 1 for an engine starting storage battery according to a first embodiment of the present invention is connected to an engine starting storage battery 2 (hereinafter referred to as a storage battery 2) and mounted on a vehicle. . A cell motor 3 for starting an engine (not shown) is connected to the storage battery 2 via a start switch 4.

  The degradation determination device 1 of the present invention has voltage measuring means 11 that measures a storage battery voltage when the engine of the storage battery 2 is started. This voltage measuring means 11 measures the first voltage bottom value VS1 immediately after the start of the cell motor and the nth voltage bottom value VSn after the second time.

  FIG. 2 shows the change in the storage battery voltage when the cell motor is driven by the storage battery for starting the engine and the engine is started. Here, the initial state is a state in which the storage battery is not deteriorated, and shows a voltage change in a state having a good engine startability. Further, the deterioration progress state indicates a voltage change in a state in which the deterioration of the storage battery has progressed and the engine start performance has deteriorated.

  As shown in FIG. 2, when the cell motor is driven, the storage battery voltage exhibits periodic pulsations due to the vehicle structure and the like, such as the number of engine cylinders.

  In the present invention, the bottom value in the periodic voltage pulsation as shown in FIG. 2, in particular, the first bottom value VS1 and the second and subsequent nth bottom values are measured by the voltage measuring means 11 and discriminated from these values. The deterioration determination of the storage battery 2 is performed by the means 12.

  As shown in FIG. 2, when the storage battery is in an initial state where deterioration has not progressed and has a good engine startability, the first bottom value VS1 and the second and subsequent nth times When the bottom value VSn is compared, VS1 is larger than VSn.

  On the other hand, in a state where the deterioration of the storage battery has progressed and the engine startability is lowered, both VS1 and VSn are lowered, but the degree of reduction of VSn is larger than the degree of reduction of VS1. The present invention utilizes such a phenomenon, and by comparing VS1 and VSn, it is possible to accurately determine the degree of deterioration of the storage battery, particularly the degree of deterioration of the storage battery in consideration of engine startability.

  As a comparison method, a difference ΔVn (= VSn−VS1) between VS1 and VSn can be calculated, and deterioration determination can be performed by the determination unit 12 based on this value. For example, when the determination values Vr and Vr ′ (Vr> Vr ′) in the value of ΔVn are set and ΔVn> Vr, it is determined that the storage battery has good engine startability, and Vr ≧ ΔVn> Vr ′ In such a case, a warning display such as “Needs attention” and “Needs replacement” can be performed when Vr ′> ΔVn.

  In the conventional method for determining deterioration based on the VS1 value, the value of VS1 varies greatly depending on the vehicle design, such as engine characteristics and cell motor characteristics, so that accurate engine startability determination is difficult. On the other hand, in the method of comparing VSn and VS1 as in the present invention, in various vehicles, when engine startability is good, VS1 <VSn, and as engine startability decreases, VSn approaches VS1, and VS1> Since there is a tendency to become VSn, by utilizing this relationship, it is possible to provide a deterioration determination method and apparatus applicable to various vehicles.

  In addition, the open circuit voltage is easily affected by charge polarization, and even when the remaining capacity is the same, the open circuit voltage is higher when the engine is stopped and restarted immediately than when the engine is stopped for a long time. . Therefore, when the open circuit voltage is included in the parameters, a difference occurs in the deterioration determination due to the difference in charge polarization. In the present invention, since the open circuit voltage is not included in the parameters, it is possible to suppress the influence of the difference in charge polarization on the determination result.

  When the VSn value is measured, the n value is 2 or more. However, since the load of the cell motor is reduced at the same time as the engine is started and there is no significant pulsation of the storage battery voltage, n is set to a value of 2 to 4. Further, the pulsation of the storage battery voltage is subjected to voltage fluctuations of a shorter period in addition to the voltage pulsation whose bottom value-bottom value time is about 0.2 seconds, which is a detection target in the present invention. Therefore, as a method for detecting the bottom value, continuous voltage measurement is performed for a time period in which at least one bottom value is included except for the first bottom value VS1 from the time of starting the cell motor (in the example of FIG. 2, about 0.4 seconds). If the lowest value in the obtained voltage data is repeatedly adopted as the bottom value, the bottom value can be detected relatively easily.

(Second Embodiment)
As shown in FIG. 3, the storage battery 21 according to the second embodiment of the present invention is a battery that integrally includes the deterioration determination device 1 described in the first embodiment in a battery body.

  As an example of attachment of the deterioration determination device 1, the deterioration determination device 1 is stored in a storage portion 23 provided on the lid 22 of the storage battery 21, and the deterioration determination device 1 and the battery terminal 24 are connected by a connection lead 25. Furthermore, a protective cover 26 may be mounted on the deterioration determination device 1.

  In the storage battery 21 of the present invention, since the deterioration determination device 1 is provided integrally, the user does not need to connect the deterioration determination device 1 to the storage battery 21 separately. Further, erroneous connection such as reverse connection by the user can be prevented.

  According to the present invention, the deterioration of the storage battery is determined using the storage battery voltage pulsation at the start of the engine, which is suitable for many engine start storage batteries including those for vehicles.

The figure which shows the deterioration determination apparatus of the storage battery for engine starting of this invention The figure which shows an example of a time-dependent change of the storage battery voltage at the time of engine starting The figure which shows the lead acid battery by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Degradation discrimination device 2 Storage battery 3 Cell motor 4 Start switch 11 Voltage measurement means 12 Discrimination means 21 Storage battery 22 Lid 23 Storage part 24 Battery terminal 25 Connection lead 26 Protective cover

Claims (7)

It is a deterioration determination method of an engine starting storage battery that supplies electric power to the engine starting cell motor. In the storage battery voltage pulsation that occurs when the cell motor is driven,
The first voltage bottom value VS1 immediately after starting the cell motor,
Measure the voltage bottom value VSn of the nth time after the second time,
A method for determining deterioration of an engine starting storage battery, wherein the deterioration of the storage battery is determined by comparing the VS1 and the VSn. 2. The engine start storage battery deterioration determination method according to claim 1, wherein deterioration of the storage battery is determined according to a difference ΔVn (= VSn−VS1) between the VSn and the VS1. The method of determining deterioration of a storage battery for engine start according to claim 1 or 2, wherein the minimum value of the storage battery voltage measured over a predetermined time from the detection of VS1 is set as the VSn. This is a deterioration determination device for an engine starting storage battery that supplies electric power to the engine starting cell motor.
Voltage measuring means for measuring the first voltage bottom value VS1 immediately after the start of the cell motor and the nth voltage bottom value VSn after the second time;
An engine starting storage battery deterioration determination device, comprising: a determination unit that compares the VS1 and the VSn to determine deterioration of the storage battery. 5. The engine start storage battery deterioration determination device according to claim 4, wherein the determination means determines deterioration of the storage battery according to a difference ΔVn (= VSn−VS1) between the VSn and the VS1. 6. The engine start storage battery deterioration determination device according to claim 4, wherein the voltage measurement means sets the minimum value of the storage battery voltage measured over a predetermined time from the detection of the VS1 as the VSn. An engine start storage battery, which is integrally provided with the deterioration determination device for an engine start storage battery according to claim 4.

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