JPS62180284A - On-vehicle battery diagnosing device - Google Patents

Abstract

PURPOSE:To easily check a battery by providing an on-vehicle battery voltage detecting means which detects the output voltage of the on-vehicle battery right after the start of electric feeding is started and a voltage comparing means which compares the detected voltage with a reference voltage set according to detected temperature. CONSTITUTION:The output voltage of the on-vehicle battery 10 is supplied to a CPU 24 from the output side of a test switch 14 through a resistance 20 at the start of electric feeding to an on-vehicle load 12, which is detected by a processing circuit 22. The output voltage of the battery 10 and the electrolyte temperature detection signal of the battery obtained by a temperature sensor 26 are supplied through the CPU 24 and an A/D converter 28 and the CPU 24 performs processes based upon the detected voltage and temperature by using a RAM 32 according to the storage contens of a ROM 30. A control signal obtained by said processes is supplied to an alarm circuit 34 and an engine control unit 36. Then, a circuit 34 perpforms illumination control over a green lamp 38, a yellow lamp 40, and a red lamp 42 and also controls a buzzer 44 and the unit 36 increases an engine rotating speed for a specific period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a battery monitoring device, and more particularly to an on-vehicle battery diagnostic device for diagnosing a vehicle battery.

BACKGROUND OF THE INVENTION Battery testers are commonly used to accurately check whether a battery has sufficient remaining capacity or whether it is time to replace the battery.

This battery tester utilizes the change in battery internal resistance that occurs during large current discharge, and therefore the battery voltage during discharge is measured to check this.

The voltage measurement is carried out 5 seconds after the start of discharge, the temperature of the electrolyte at that time is -15℃, and the discharge current is 150A, 300A, depending on the type (model) of the battery.
It is divided into 500A.

In the battery tester shown in Japanese Patent Publication No. 48-41340@, measurements are performed by adjusting the temperature adjustment dial to the temperature of the battery electrolyte measured using a thermometer.
This facilitates its handling.

However, in vehicles, there has been a problem in that it is difficult for general vehicle users to prepare a battery tester and use it to check the vehicle battery.

(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems, and
The purpose is to provide an on-vehicle battery monitoring device that makes it possible to easily check an on-vehicle battery without preparing a battery tester.

(Summary of the Invention) In order to achieve the above object, an apparatus according to the present invention is constructed as shown in FIG.

The start of energization of a predetermined on-vehicle load that consumes a large current using the on-board battery is detected by the energization start detection means a shown in the figure, and the temperature of the electrolyte of the on-vehicle battery immediately after the detection of the start of energization is The output voltage is detected by the battery fluid temperature detection means and the battery voltage detection means C, respectively.

The reference voltage set according to the detected temperature and the detected voltage are compared in the voltage comparing means d.

(Description of Embodiments) Hereinafter, preferred embodiments of the apparatus according to the present invention will be described based on the drawings.

In FIG. 2, an on-vehicle load 12 is
The energization is started when the test switch 14 is turned on and the relay 16 and the electromagnetic switch 18 are turned on.

At the start of energization, the output voltage of the on-vehicle battery 10 is supplied from the output side of the test switch 14 to the CPU 24 of the processing circuit 22 via the resistor 20, and the start of energization to the on-vehicle load 12 is caused by the voltage on the processing circuit 22 side. has been detected.

Further, the output voltage of the vehicle battery 10 and the electrolyte temperature detection signal of the vehicle battery 10 obtained by the temperature sensor 26 are supplied to the CPU 24 of the processing circuit 22 via the A-return converter 28. Processing based on detected voltage and detected temperature is performed in RAM according to the memory contents.
This is done using 32.

The first control signal obtained through the processing is sent to the warning circuit 34.
A second control signal is also provided to the engine control unit 36, respectively.

The warning circuit 34 turns on the green lamp 38. yellow lamp 4
0. The lighting control of the red lamp 42 and the drive control of the buzzer 44 are performed, and the engine control unit 3
6, the engine speed is increased for a predetermined period during engine idle link.

Note that a constant operating voltage is always supplied to the CPU 24 from a constant voltage power supply 46.

Further, in this embodiment, a headlamp is used as the on-vehicle load 12, but a pro-afan motor, a rear defogger, etc. may be used instead, or a combination of these may be used.

This embodiment has the above configuration, and its operation will be explained below.

FIG. 3 is a flowchart showing the procedure of the process performed by the CPU 24 of FIG. 2. First, it is determined whether the test switch 14 has been turned on (step 100).

The test switch 14 is turned on when the on-board loads other than the on-vehicle load 12 are not operating and the engine is stopped, and the start of energization to the on-vehicle load 12 due to the on-operation is performed via the test switch 14 and the resistor 20. When it is confirmed from the given output voltage of the vehicle battery 10 (affirmative determination in step 100), the electrolyte temperature of the vehicle battery 10 detected by the temperature sensor 26 and the output voltage of the vehicle battery 10 are read. (Step 102.1
04>.

Next, the vehicle battery 1 detected by the temperature sensor 26
The temperature of the electrolytic solution at 0 is in the range of 0''C or more, less than O'C in the range of 12°C or more, less than -2°C in the range of 18°C or more,
It is determined whether the range is below -8°C and above -13°C, below -13°C and above -16°C, or below -16°C and above -20°C (step 106, 1).
08,110,112.114,116>.

If the electrolyte temperature is in the temperature range of O'C or higher (affirmative determination in step 106), it is determined whether the battery voltage is 11.5V or higher (step 11).
8) When the battery voltage is 11.5 V or more, the green lamp 38 is lit (step 120).
V (negative determination in step 118), and 1
When the voltage is 1.0 V or more, the yellow lamp 40 is turned on and the engine speed is increased by the engine control unit 36 for a predetermined period during idling (affirmative determination in step 120, step 122>
, when the voltage is less than 11.0V, the red lamp 42 is lit and the buzzer 44 is activated, and the engine speed is increased by the engine control unit 36 for a predetermined period during idle linking (if the determination is negative in step 120, Step 124).

If the electrolyte temperature is less than 0°C and falls within the range of 12°C or more (negative determination in step 106, affirmative determination in step 108), it is determined whether the battery voltage is 11.3V or more. is determined (step 126>, 11.
When it is 3V or more (affirmative determination in step 126)
, the green lamp 38 is turned on (step 120).

Also, when the battery voltage is less than 11.3V and more than 10.8V (negative determination in step 126, step 128
positive judgment>, less than 10.8V (step 1
26 and step 128), the yellow lamp 40 is turned on and the engine speed is increased (step 122), the red lamp 42 is turned on, the buzzer 44 is driven, and the engine speed is increased (step 124). are carried out respectively.

Further, if the electrolyte temperature is in the range of less than 12°C and 8°C or more (negative determination in step 108, positive determination in step 110), the battery voltage is 11.1V.
It is determined whether or not this is the case (step 130).

At this time, if it is determined that the battery voltage is 11.1V or higher, the green lamp 38 is turned on (step 12).
0), and when the voltage is less than 11.1V and 10.6V or more, the yellow lamp 40 is turned on and the engine speed is controlled (negative determination in step 130, step 11).
If the voltage is less than 10.6V, the red lamp 42 is turned on, the buzzer 44 is driven, and the engine speed is controlled (Step 13).
0 for a negative determination, step 132 for a negative determination, step 124).

Further, if the electrolyte temperature is in the range of less than 18°C and more than 113°C (negative determination in step 110, positive determination in step 112), the battery voltage is 10.9°C.
It is determined whether it is equal to or greater than V (step 134).

At this time, if the battery voltage is 10.9V or higher, the green lamp 38 is lit (affirmative determination in step 134,
Step 120>, when it is less than 10.9V and 10.4V or more, a yellow lamp is lit and the engine speed is increased (negative determination in step 134, positive determination in step 136, step 122), .4V
When it is less than 1, the red lamp 42 is turned on, the buzzer 44 is driven, and the engine speed is controlled (step 134).
negative determination at step 136, negative determination at step 124).

If the electrolyte temperature is in the range of less than 113°C and more than 116°C, it is determined whether the battery voltage is 10°7V or more (step 138).

At this time, if the battery voltage is 10.7V or more, the green lamp 38 is lit (affirmative determination in step 138,
Step 120>, when the voltage is less than 10.7V and 10.2V or more, the yellow lamp 40 is turned on and the engine speed is controlled (step 138 is also negative, step 140 is positive, Step '122>
, when the voltage is less than 10°2V, the red lamp 42 lights up, the buzzer 44 is driven, and the engine speed is controlled (
Negative determination in step 138, negative determination in step 140, step 124).

Furthermore, if the electrolyte temperature falls below -16°C and exceeds -20'C (negative determination in step 144, positive determination in step 116), the battery voltage is 1.
It is determined whether the voltage is 0.5V or more (step 14).
2).

At this time, if the battery voltage is 10.5 or more, the green lamp 38 is lit (affirmative determination in step 142, step 120), and if the battery voltage is less than 10.5V and 10.0V or more, the yellow lamp 40 is lit and the engine is running. The number control is performed (negative determination in step 142, positive determination in step 144, step 122>, 10.0V
When the value is less than 1, the red lamp 42 is turned on, the buzzer 44 is driven, and the engine speed is controlled (step 14).
2, a negative determination in step 144, step 124).

In this embodiment, the above processing is performed, so that when the test switch 14 is turned on and power supply to the on-vehicle load 12 is started, and at the same time, the electrolyte temperature and output voltage of the on-vehicle battery 10 are read (step 102,10
4>, a stepped electrolyte temperature-battery voltage characteristic 200 for charging warning shown in FIG. 4 is prepared (step 11).
8, 126. 130, 134, 138, 142>, Electrolyte temperature for battery replacement, which is similarly stepped-
A battery voltage characteristic 202 is set (step 120,
128, 132, 136, 140° 144>, a determination is made using these.

Furthermore, due to the characteristics 204 and 206 in Fig. 4, the characteristic 200.2
02 is shown, and when the vehicle battery 10 is under no load, the battery voltage changes according to the electrolyte temperature according to the characteristic 208.

Here, when the vehicle battery 10 has hardly deteriorated, its remaining capacity is sufficient, and the electrolyte temperature is 20'C or higher (for example, 26°C), the test switch 1
4 is turned on to start energizing the on-vehicle load 12, the battery voltage changes as shown by the characteristic 210 in FIG. It decreases by 0.8V.

Since the voltage drop is small, the battery voltage is 11.5V
Therefore, the green lamp 38 is lit to confirm that the on-vehicle load 12 does not need to be charged or replaced.

Furthermore, when the remaining capacity of the on-board battery 10 is extremely low and the test switch 14 is turned on to start energizing the on-board load 12, the battery voltage increases as shown by characteristic 212 in FIG. 5(B). Change.

At the start of energization, the battery voltage drops by 1.0V or more, and as a result falls below 11.5V.

Therefore, the operating point determined by the electrolyte temperature and output voltage of the vehicle battery 10 is below the characteristic 200 in FIG. 36, the engine speed during idling is increased and the vehicle battery 10 is automatically charged (steps 118, 120, 122>).

Thereafter, when the on-vehicle battery 10 has been used for a long period of time and has significantly deteriorated and its remaining capacity is sufficient, when the test switch 14 is turned on and energization to the on-vehicle load 12 is started, the sixth The battery voltage changes as shown by characteristic 214 in Figure (A).

At the start of energization, the battery voltage drops by about 0.8V as in Fig. 5 (A>), and since the amount of voltage drop is small, the operating point determined by the electrolyte temperature and output voltage of the vehicle battery 10 is In Figure 4, it is above characteristic 200,
Therefore, the green lamp is lit.

Thereafter, when the remaining capacity of the on-vehicle battery 10 decreases and energization of the on-vehicle load 12 is started, the output voltage of the on-vehicle battery 10 changes as shown by characteristic 216 in FIG. 6(B).

At the start of energization, the battery voltage drops by 1.5V or more and falls below 11.0V.

In that case, the operating point determined by the electrolyte temperature and battery voltage of the vehicle battery 10 will be below the characteristic 202 in FIG. 1
At the same time, the engine speed is increased for a predetermined period during idling to automatically charge the vehicle battery 10 (steps 118, 120, and 124).

As explained above, according to this embodiment, when the start of energization using the on-board battery 10 to the on-board load 12 that consumes a large current is detected, the on-board disconnection 10
The electrolyte temperature and output voltage are detected and set according to the detected temperature (steps 106, 108, 110, 112,
114, 116) charging warning reference voltage for the vehicle-mounted battery 10 (steps 118, 126, 130, 134°138.142) and replacement warning reference voltage for the vehicle-mounted battery 10 (steps 120, 128, 132, 136,
140, 144> and the detected voltage, and according to the comparison results, the green lamp 38° and the yellow lamp 40. red lamp 4
Since the lighting control of 2 and the drive control of the buzzer 44 are performed, even a general vehicle user can easily check the necessity of charging and replacing the vehicle battery 10 without preparing a separate battery tester. It becomes possible to check quickly.

Further, according to this embodiment, when the remaining capacity of the on-board battery 10 is insufficient, the engine speed is increased for a predetermined period during idle link, and the on-board battery 10 is increased.
Since charging is performed automatically, it is not necessary to separately prepare a charger for the on-vehicle battery 10, and it is possible to reliably prevent the engine from becoming impossible to start due to insufficient remaining capacity of the on-vehicle battery 10.

Note that the red lamp 42 in FIG. It is also possible to omit the buzzer 44 and change the process shown in FIG. 3 to the process shown in FIG. 7.

In the process shown in FIG. 7, when the electrolyte temperature of the on-vehicle battery 10 is read after the start of energization to the on-vehicle load 12 is confirmed (steps 100, 102), t seconds (for example, 5 seconds) have elapsed since the start of energization. When the time has elapsed, the output voltage of the on-vehicle battery 10 is read (step 146), and therefore, the voltage set in the same way as a battery tester is used to check the on-vehicle battery 10.

In addition, in FIG. 7, the electrolyte temperature of the vehicle battery 10 is in a range of 4°C or more, a range of less than 4°C and 14°C or more,
-11°C range below -4°C, -16°C below -11°C
It is determined whether the temperature falls within a range of 120°C or higher, or a range of 20°C or higher below -16°C (step 148).
, 150, 152, 154° 156>, the electrolyte temperature is 4
9°5V when the temperature is above ℃, 9.3V when the temperature is below 4°C and above -4°C, and 9.1V when the temperature is below -4°C and above -11°C.

If it is less than -11°C or more than 16°C, G: is 8.9
V, = less than 16°C r - 20'C or more G:: C8
．． A charging warning reference voltage of 7V is set respectively (steps 158, 160, 162, 164, 168).

Therefore, for example, when the on-vehicle load 12 is changed and the on-vehicle battery 1
If the discharge current of 0 is 150A, the vehicle battery 1
When the operating point determined by the electrolyte temperature of 0 and the output voltage is above the characteristic 200 in FIG. 8, the green lamp 38 is lit (
Step 120), when it is on the lower side, the yellow lamp 40 is turned on to prompt charging, and the engine control unit 36 increases the engine speed during idling for a predetermined period of time to automatically charge the vehicle battery 10. (step 122).

(Effects of the Invention) As explained above, according to the present invention, the temperature of the electrolyte of the on-board battery changes immediately after the start of energization using the on-board battery is detected for a predetermined load that consumes a large current. Since the output voltage is detected and the detected voltage is compared with the reference voltage set according to the detected temperature, even general vehicle users can use the comparison results to determine the in-vehicle battery without preparing a separate battery tester. Checks can be easily performed.

Furthermore, using the comparison results, it is also possible to automatically issue charging warnings, battery replacement warnings, battery charging, etc.

[Brief explanation of drawings]

FIG. 1 is a complaint correspondence diagram, FIG. 2 is a circuit configuration diagram showing a preferred embodiment of the device according to the present invention, and FIG. 3 is a flowchart explaining the processing procedure of the CPtJ24 in FIG.
FIG. 4 is an electrolyte temperature-battery voltage characteristic diagram explaining the action of the embodiment shown in FIG. 2, FIGS. 5 and 6 are battery voltage characteristic diagrams explaining the action of the embodiment shown in FIG. 2, and FIG. CPU24
FIG. 8 is a flowchart illustrating another processing procedure, and FIG. 8 is an electrolyte temperature-battery voltage characteristic diagram when the processing of FIG. 7 is performed. 10... Vehicle battery 12... Vehicle load 14... Test switch 16... Relay 18... Electromagnetic switch 20... Resistor 22... Processing circuit 24... CPU 26... Temperature sensor 34... Warning circuit 36... Engine control unit 38... Green lamp 40... Yellow lamp 42... Red lamp 44... Buzzer patent applicant Nissan Motor Co., Ltd. '1 FL (V) B, Te 11 Kamezo Figure 6 No. 9 Te i Voltage (I Basola → IIE (V)

Claims (1)

[Claims] (1) Energization start detection means for detecting the start of energization performed using an on-vehicle battery for a predetermined on-vehicle load that consumes a large current, and a battery solution that detects the temperature of the electrolyte of the on-vehicle battery immediately after the start of energization is detected. A battery voltage detection means for detecting the output voltage of the vehicle battery immediately after detecting the start of energization; and a voltage comparison means for comparing the detected voltage with a reference voltage set according to the detected temperature. Characteristics of the in-vehicle battery diagnostic device.