JPS61223571A - Service life forecaster for storage battery carried on automobile - Google Patents

Abstract

PURPOSE:To prevent disable start of an engine, by memorizing a drop range of a terminal voltage of a storage battery at the startup of an engine detecting the current terminal voltage to display each state on an operator's seat. CONSTITUTION:As the life of a storage battery approaches the end of the life, the drop rang of the terminal voltage at the startup of engine increases. Because of this, it is so arranged that the output of IC2 composing a first terminal voltage detection circuit 1-1 reaches the H level, for example, when the terminal voltage falls below 9.0 V, the output of an IC3 reaches the H level, for example, when the terminal voltage falls below 8.0 V and the output of an IC4 reaches the H level, for example, when the terminal voltage falls below 7.0 V and light emitting diodes corresponding to each case are provided as L1: green, L2: orange,L3: red and L4: red to make a display on the operator's seat. The step where L3 is lighted, namely, where one red light come ON indicates that the light of the storage battery exceeds 90%, reaching the end of the life thereof thereby enabling a forecast on whether the storage battery reaches the end of life thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for predicting the lifespan of a storage battery, and more specifically to a device for predicting the lifespan of a storage battery mounted on an automobile.

Conventional technology and points of interest Storage batteries, especially those installed in automobiles, supply a large current when the engine is started, so the terminal voltage of the storage battery drops significantly, and as it approaches the end of its life, this drop becomes larger, making it difficult to start the engine. Sometimes it became impossible. Therefore, there is a need to predict in advance whether or not a storage battery is at the end of its lifespan in order to prevent the above-mentioned troubles.

As a solution to the above-mentioned drawbacks, for example,
As shown in Japanese Patent Publication No. B-48865, during the charging process of a storage battery, the charging voltage is changed. There is a device that connects a life evaluation vessel to a vessel and visually observes the life evaluation vessel from the outside to predict whether or not it is at the end of its life based on its corrosion state.

However, in the former case, the storage battery installed in the car is connected to the alternator in parallel with the load and charged in a floating manner, so fluctuations in the charging voltage are affected by load fluctuations, causing an inflection point in the charging voltage. was sometimes detected. In addition, in the latter case, the storage battery installed in the car is not only an opaque case made of merip resin, but also
The location where it is installed is often difficult to see,
In order to visually check the corrosion state of a chartered vessel for life evaluation, it was necessary to remove the storage battery, which was uneconomical.

Purpose of the Invention The present invention solves the above-mentioned drawbacks, and makes it possible to prevent the engine from starting by reliably predicting whether or not the storage battery installed in the vehicle is at the end of its life, and by displaying the status on the driver's seat, etc. The purpose is to prevent this from becoming impossible.

Structure of the Invention The present invention was made by focusing on the fact that the closer a storage battery installed in an automobile approaches the end of its life, the greater the drop in terminal voltage at the time of starting the engine. The amount of decrease in the battery is detected and stored by detecting the terminal voltage at that time, and the storage voltage is used to drive a display circuit, and the output of the display circuit is displayed on the driver's seat etc. to determine whether the storage battery is at the end of its life. It is something that allows us to predict or determine what is going on.

EXAMPLES The present invention will be explained below using examples. FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the battery life and the terminal voltage of the storage battery at the time of starting the engine. In FIG. 1, 1-1, 1-2 are respectively 1. A second terminal voltage detection circuit, 2 a memory circuit, 3 a display circuit, and 4 a power supply circuit, which includes a reference voltage (to be described later), the first and second terminal voltage detection circuits, a relay coil, a memory circuit, and a display circuit. Supplies power supply voltage to

01-05 are capacitors, D1-D4 are diodes, I
C1 to XO5 are integrated circuits such as operational amplifiers, the first terminal voltage detection circuit 1-1 is composed of 101 to I04, and the second terminal voltage detection circuit 1-2 is composed of 10IJ. L1 to L4 are light emitting diodes constituting the display circuit 3, R1 to R16 are fixed resistors, and RY1 is a relay coil. When the relay coil is energized, the meter contact S1 is turned on. T1 is a transistor, T
H1 to TH4 are lucayristors that constitute the memory circuit 2, vu
1 and VB2 are variable resistors, zD11ZD2 is a constant voltage diode, and PlsNl is an input terminal to which the terminal voltage of the storage battery is applied.

Next, the operation of the above embodiment will be explained.

Now, from the power supply circuit 4 to each non-inverting input terminal of xol, xa2, zo3, and IC4 that constitute the first terminal voltage detection circuit 1-1, the voltage of the constant voltage diode ZD2 is divided by R8 to R12y and VB2. The voltage of constant voltage diode=1 is applied as a reference voltage to the non-inverting input terminal of circuit C5 constituting the second terminal voltage detection circuit 1-2. The obtained voltage is applied as a reference voltage, and the value of each reference m pressure is set as 1 o for 101 and 9. for o V * IC2. Ov, 10g Cas, ov, 104 is 7. O.V.
, VRl , V so that IC5 becomes 11.5V
Adjust B2.

In this manner, the engine of the automobile is stopped, and the terminal P1. When the terminal voltage vB of the storage battery is applied between H1 with the polarity shown by the arrow, vB is about 12.5 V, so the I
The output voltage of C5 is approximately 2V (hereinafter referred to as L level), and transistor 't'1 is in an off state. When the engine is started, a cranking current flows, and the terminal voltage of the storage battery drops to about 9.7V, but as the engine starts, it is charged by the alternator, and although it once rises rapidly, it reaches about 14V due to the operation of the regulator. 5
It becomes stable at about V. The operation at this time will be explained below. When the terminal voltage of the storage battery drops significantly by about 9.7V, the output of Iol suddenly rises from about 2V to around the output voltage of the power supply circuit 4 (hereinafter referred to as H level), turning on the transistor T1 and attaching the relay coil RY1. to turn on the meter contact S1.

When the meter contact S1 is turned on, the reference voltage is supplied to the non-inverting input terminal of the terminal C4 that constitutes the first terminal voltage detection circuit 1-1, and the thyristor that constitutes the memory circuit 2 is supplied with power. A voltage is applied. If the terminal voltage of the storage battery at this time is less than the reference voltage of 10.0 V supplied to the non-inverting input terminal of the device C1, the output of Iol becomes H level, triggering the thyristor TH1 to turn it on and emit light. Turn on diode L1. When the storage battery is charged by the alternator and the terminal voltage rises rapidly and exceeds the reference voltage 11.5V applied to the non-inverting input terminal of 105, the output of 105 becomes L level, turning off the transistor T1 and turning off the relay coil. RY1 is deenergized and meter contact S1 is turned off. When the meter contact S1 is turned off, the power supply voltage is no longer applied to the thyristor TH1, so it is turned off and the light emitting diode L1 is turned off. In this way, when the light emitting diode L1 lights up when the engine starts, it is possible to detect that the terminal voltage of the storage battery has decreased to 10.0V or less, but the detection effect can be improved by lengthening the time that the light emitting diode L1 is turned on. In order to increase the power consumption, it is possible to appropriately determine the sizes of fixed resistor R6 and capacitor C5, and even if the output of 105 goes to L level, it is possible to keep transistor T1 ON for a time determined by its time constant. be. Furthermore, the same effect can be obtained by using a relay coil RYl with a delay instead of the capacitor C5.

Next, it will be explained with reference to FIG. 2 that the closer the storage battery comes to the end of its life, the greater the reduction in the terminal voltage when starting the engine. Figure 2 shows storage batteries that have reached their 1st life period, with the storage battery life on the horizontal axis being 100 arcs, and similarly 20%, 40%, 60-1
An engine starting test was carried out using an 80-cm storage battery,
The terminal voltage at startup is 1117). Here, 100% battery life means that the engine is started once a day and the 111 hours of charging continues for two years.

From Figure 2, the engine starts when the terminal voltage is 9.5V or higher until the storage battery life reaches 60%, but when it exceeds 80%, the terminal voltage at the time of engine starting drops rapidly, and the battery life reaches 60%.
It can be seen that when it gets close to 00%, it will finally start at around 6.5v to 7.5v, and when it reaches 100%, it will drop below 6.5v, making it impossible to start.

From this#! Terminal voltage detection circuit 1-1 The output of circuit C2 that constitutes 1 becomes H level when the terminal voltage is 9
．． When the voltage is below 0V, the output of xO,5 becomes H level when the terminal voltage becomes below 8.0V, and the output of XO4 becomes H level when the terminal voltage becomes below 7.0V. Since it is the time when the light emitting diode corresponding to each
l: green, L2: orange yL5: red, L4: red t,
It will be displayed that the storage battery has reached the end of its lifespan by exceeding 790%, and it is possible to predict or determine whether the storage battery is at the end of its lifespan.

In the above, the power supply circuit 4 is designed to be stable so that the reference voltage of the first terminal voltage detection circuit 1-1 does not fluctuate or the operation of the relay coil RY1 does not become unstable due to changes in the terminal voltage of the storage battery as described above. This is for supplying a power supply voltage.

As described in detail in the effect example of Ichimei, the present invention predicts or predicts whether or not a storage battery is at the end of its life by displaying different displays depending on the range of decrease in the terminal voltage of the storage battery when starting the engine of an automobile. It is possible to identify the engine and prevent troubles such as the inability to start the engine.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the battery life and the terminal voltage of the storage battery at the time of starting the engine. 1-1.1-2...First and second terminal voltage detection circuit 2...Storage circuit 3...Display circuit 4...
power circuit

Claims (1)

[Claims] (1) A first terminal voltage detection circuit that operates in stages according to the range of decrease in the terminal voltage of the storage battery when starting the engine, a memory circuit that stores the output state of the first terminal voltage detection circuit, and its memory. A display circuit that displays the status;
and a second terminal voltage detection circuit that detects engine starting and alternator operation, and the second terminal voltage detection circuit detects engine starting and connects the first terminal voltage detection circuit and the memory. A circuit and a display circuit are operated to display the range of decrease in terminal voltage of a storage battery for a certain period of time, and the operation of the memory circuit and display circuit is stopped by detecting the operation of an alternator. A lifespan prediction device for the installed storage battery.