JP2002221559A - Vehicle battery diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle battery deterioration diagnostic device capable of improving a battery deterioration diagnostic precision by improving a diagnostic control means, and facilitating mounting or dismounting of each detector on the battery by compacting an arrangement structure of the detectors used for battery deterioration diagnosis, and enabling more appropriate driving control of a vehicle by removing an evil effect based on deterioration of the battery, concerning the vehicle battery deterioration diagnostic device for diagnosing the battery from a relation characteristic between a discharge current and a terminal voltage in consideration of a battery electrolyte temperature. SOLUTION: This vehicle battery diagnostic device is equipped with the battery, an operation part for operating the battery characteristic from the terminal voltage and the discharge current of the battery, a determination part for determining the battery deterioration state based on the battery characteristic and the battery electrolyte temperature, and a cranking determination part for determining cranking of an internal combustion engine starting device. The determination part determines the battery deterioration state at the cranking time based on determination by the cranking determination part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery diagnostic device for a vehicle, and more particularly to a battery diagnostic device for a vehicle in which a driver can easily diagnose deterioration of a battery mounted on the vehicle while the battery is mounted.

[0002]

2. Description of the Related Art Conventional diagnosis of a battery for a vehicle is performed by connecting a diagnostic load to the battery for several seconds at many gas stations and car repair shops nationwide to discharge the battery, and to determine the terminal voltage of the battery. Is compared with a reference battery terminal voltage to determine the quality of the battery (see, for example, Japanese Utility Model Laid-Open No. 1-67584).

In the battery diagnosis disclosed in Japanese Patent Publication No. 1-39069, a battery discharge current and a battery terminal voltage during a large current discharge are detected, and based on the detected values, an electromotive force and a short circuit of the battery are detected. Calculate the current and substitute it into a function that shows the correlation between the maximum output and the remaining battery capacity experimentally determined in advance, calculate the current remaining battery capacity, and use this remaining battery capacity to prevent the battery from running out and replace it. We predict the time. Also, JP-A-2000-2
The battery diagnosis method disclosed in Japanese Patent Application Laid-Open No. 06215 includes storage means for storing in advance the characteristic value of the battery at the time of abnormality, and determines whether or not the battery is abnormal based on the characteristic value at the time of abnormality, the battery terminal voltage value, and the discharge current value. It is determined whether or not.

[0004]

However, the conventional battery diagnosis performed at a number of gas stations and car repair shops nationwide is inconvenient because the diagnosis cannot be made unless the user goes to a specific place having the diagnostic equipment. There are issues. In addition, when starting the internal combustion engine, it is not possible to grasp the current state of deterioration of the battery, and there is a problem that it is not possible to cope with a traveling obstacle due to insufficient battery capacity.

Further, what is diagnosed from the relationship between the discharge current of the battery and the terminal voltage largely depends on the liquid temperature of the battery, and the open-circuit voltage and the short-circuit current tend to be lower at low temperatures than at high temperatures. Therefore, in the method of diagnosing based on the terminal voltage and the discharge current as in the battery diagnosis described above, accurate diagnosis may not be performed because temperature characteristics are not considered.

In view of the above, a technique for diagnosing a battery from the characteristic of the relationship between the discharge current and the terminal voltage in consideration of the battery fluid temperature has been proposed (JP-A-7-84015).
JP, JP-A-6-174808, JP-A-2000
However, it is desired to develop a battery diagnostic device capable of performing a more accurate diagnosis even when the battery is diagnosed from the relationship between the discharge current and the terminal voltage in consideration of the battery fluid temperature. .

[0007] Further, in relation to the operating state of the vehicle, it is necessary to diagnose the battery at a more appropriate operation time, and the arrangement of the detector for the discharge current, the terminal voltage, and the battery fluid temperature is also required. Care must be taken to make a more accurate diagnosis. Improving the arrangement structure of the respective detectors can also facilitate mounting and detachment of the respective detectors from the battery. Further, by connecting the signal of the battery diagnosis result and other operation control means of the vehicle in a controlled manner, it is possible to eliminate the adverse effects due to the deterioration of the battery and to enable more appropriate operation control of the vehicle. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a battery deterioration for a vehicle which diagnoses a battery based on a relationship characteristic between a discharge current and a terminal voltage in consideration of a battery fluid temperature. In the diagnostic device, the diagnostic control means is improved to improve the accuracy of the battery deterioration diagnosis, and the arrangement structure of the detector used for the battery deterioration diagnosis is made compact, so that the mounting and dismounting of each detector to and from the battery is facilitated. It is an object of the present invention to provide a vehicle battery deterioration diagnosis device capable of performing more appropriate vehicle operation control without eliminating the adverse effects due to battery deterioration.

[0009]

In order to achieve the above object, a vehicle battery diagnostic device according to the present invention basically comprises:
A battery, a calculation unit for calculating battery characteristics from a terminal voltage and a discharge current of the battery, a determination unit for determining a battery deterioration state based on the battery characteristics and the battery fluid temperature, and A cranking determination unit that determines that the battery is degraded when the cranking is performed based on the determination by the cranking determination unit.

[0010] The vehicle battery diagnostic device of the present invention configured as described above grasps the deterioration state from the characteristics of the battery liquid temperature, terminal voltage and discharge current, so that accurate diagnosis adapted to the battery temperature can be performed. Since the deterioration state is diagnosed at the time of cranking at the start of the internal combustion engine, it is possible to detect the deterioration of the battery before traveling, and to cope with a traveling obstacle due to insufficient battery capacity.

In a specific aspect of the vehicle battery diagnostic device according to the present invention, the battery diagnostic device includes a storage unit that stores a deterioration determination area for each battery fluid temperature, and the determination unit includes: A battery deterioration state is determined based on the deterioration determination area stored in the storage unit, and the deterioration determination area for each battery liquid temperature in the storage unit is a characteristic of a discharge current and a terminal voltage for each battery liquid temperature, It is characterized by being divided into three regions of "normal", "attention", and "abnormal" or more regions.

In the battery diagnostic apparatus for a vehicle according to the present invention configured as described above, the deterioration determination area for each battery fluid temperature in the storage unit is a characteristic of the discharge current and the terminal voltage for each battery fluid temperature. Since the area can be divided into three areas of "attention" and "abnormal" or more areas, the deterioration state can be qualitatively grasped by the judgment unit.

In another specific aspect of the vehicle battery diagnostic apparatus according to the present invention, a current sensor, a voltage sensor, and a temperature sensor of the battery are all provided integrally near a positive terminal of the battery. And the temperature sensor is attached to a battery liquid insertion port of the battery,
The current sensor is mounted on a conductive member connected to a positive terminal of a battery, and the current sensor is a Hall element type.

In the vehicle battery diagnostic device of the present invention having the above-described structure, the current sensor, the voltage sensor, and the temperature sensor are all provided integrally near the battery positive terminal, so that accurate battery discharge is achieved. The current, terminal voltage and liquid temperature can be detected, the space is small, and the battery can be easily removed when replacing the battery. In addition, since the temperature sensor is attached to the battery liquid insertion port of the battery, there is no need to modify the battery to install a new temperature detection unit, it is easy to remove, and the current sensor is connected to the battery positive terminal. Since it is mounted on the conductive member connected to the current sensor, it can be easily removed. Since the current sensor is a Hall element type current sensor, there is no risk of heat generation or burning when a large current is supplied.

Further, a vehicle control device provided with the battery deterioration diagnosis device according to the present invention includes a vehicle condition detection unit and an internal combustion engine control unit, and the vehicle condition detection unit is provided with the battery deterioration diagnosis device of the battery deterioration diagnosis device. A state determination result is input, and the internal combustion engine control unit determines the determination result of the battery deterioration state as one of idle stop permission conditions. It is characterized by a stop state.

In the vehicle battery diagnostic device of the present invention configured as described above, when the battery deterioration diagnostic device is applied to an idle stop vehicle, a determination result is sent to a vehicle status detecting unit, and when "normal", Is one of the idle stop permission conditions, it is possible to avoid a state in which restart is impossible due to a dead battery.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle battery deterioration diagnosis apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a control block diagram of a control system of a vehicle control device including the battery deterioration diagnosis device of the present embodiment. The vehicle is equipped with an internal combustion engine 1 for running the vehicle, a battery 3 for supplying power to each part of the vehicle, and a vehicle control device including the battery deterioration diagnosis device 4. 1, an internal combustion engine starting device 2 for starting the internal combustion engine 1 is mounted. Further, a display 5 for displaying a diagnosis result from the battery deterioration diagnosing device 4 is connected to the battery deterioration diagnosing device 4. In the control device, the deterioration state of the battery 3 is diagnosed by the battery deterioration diagnosis device 4, and the result of the diagnosis is output to the indicator 5 installed in the driver's seat or the like, and the driver is notified of the deterioration state. Battery deterioration diagnosis device 4 of the present embodiment
Is for diagnosing the deterioration state of the battery 3 based on the characteristics of the liquid temperature of the battery 3, the terminal voltage, and the discharge current.

FIG. 2 shows a configuration of a signal transmission connection between the vehicle battery deterioration diagnosis device 4 and the battery 3 of the present embodiment and a configuration of a power connection between each part of the electric equipment of the vehicle and the battery 3. It is. Specifically, each detection unit (temperature sensor 32, voltage sensor (copper plate)) of battery deterioration diagnosis device 4
38, current sensor 39, and detection device 50 integrated with each other.
Is shown in a state where is attached to the battery 3.

A Hall element type current sensor 39 is disposed above the copper plate 38 through which the battery discharge current, which also functions as a voltage sensor, flows.
A signal input / output harness 40 is mounted. Copper plate 3
The signal line for voltage detection 8 is also connected to the harness 40. The temperature sensor 32 is connected to a temperature sensor signal line 33 extending from the harness 40. Signal line 3
3 and a signal line 4 extending separately from the harness 40
Reference numeral 1 denotes an input / output line to each of the sensors 32, 38, and 39, which is connected to a later-described operation unit 14 or determination unit 15 of the battery deterioration diagnosis device 4.

The connection portion (signal transmission connection portion and power connection portion) is mounted on the battery 3 by connecting one end of a copper plate 38 to the positive terminal 37 of the battery 3 and connecting the other end of the copper plate 38 to a connection means 42. The main current line 43 inside the vehicle
Is connected to The temperature sensor 32 is mounted on the battery liquid insertion port 34 next to the battery positive terminal 37, and the inside of the battery 3 is sealed by the sealing means 35. The temperature is detected by the lower end 36 of the temperature sensor 32, and the lower end 36 is surely immersed in the battery fluid.

As described above, by using the detecting device 50 in which the detecting portions (the temperature sensor 32, the voltage detecting portion 38, and the current sensor 39) of the battery deterioration diagnosing device 4 are integrated, when the battery is replaced, etc. , Easily each sensor 32,3
8, 39 can be removed and the space can be reduced because of the integral type.

FIG. 3 is a schematic diagram of a control system inside the battery deterioration diagnosis device 4. The battery deterioration diagnosis device 4
Is a current detector 11 for detecting a discharge current of the battery 3.
And a voltage detector 12 for detecting a terminal voltage of the battery 3
A temperature detecting unit 13 for detecting a liquid temperature of the battery 3, a cranking determining unit 17 for determining that the internal combustion engine starting device 2 is operating and cranking, a current detecting unit 11, and a voltage detecting unit 12. A calculating unit 14 for calculating the characteristics of the battery 3 based on the information from the cranking determining unit 17; a storage unit 16 in which a deterioration determination area for each battery liquid temperature is stored in advance; a temperature detecting unit 13; Determining unit 1 that determines the state of deterioration of battery 3 based on information in storage unit 14 and storage unit 16
5.

FIG. 4 shows the drooping characteristics of the discharge current and the terminal voltage when the battery temperature is used as a parameter. As shown in FIG. 4, the drooping characteristic of the battery 3 greatly depends on the liquid temperature, and the characteristic gradient increases as the liquid temperature decreases, and the open-circuit voltage when the discharge current is zero tends to decrease. . Therefore, it is necessary to select a deterioration determination region corresponding to the battery fluid temperature.

FIG. 5 shows a battery deterioration judging area based on the discharge current and the drooping characteristics of the terminal voltage when the battery fluid temperature is T ° C. in the battery deterioration diagnostic apparatus of the present embodiment. In the present embodiment, the determination area is divided into three areas of “normal”, “caution”, and “abnormal”.

FIGS. 6 and 7 show control flowcharts of the deterioration diagnosis of the battery deterioration diagnosis device 4 of the present embodiment. In step 21, confirm that the engine has stopped,
In step 22, the cranking determination unit 17 determines whether cranking has started. If it is determined in step 22 that cranking has started, on the other hand, in step 23, the deterioration determination area (the battery deterioration determination area in FIG. 5) corresponding to the measured value T of the temperature detector 13 is determined from the storage unit 16. In step 24, the measurement of the elapsed cranking time t is started.

Next, in step 25, the cranking elapsed time t has reached the preset time t1 (t = t
1) It is determined whether or not the elapsed time t has reached the set time t1 (t = t1), on the other hand, the process proceeds to step 27, and based on the signals from the current detection unit 11 and the voltage detection unit 12, The battery discharge current I1 and the battery terminal voltage V1 are obtained.
On the other hand, the process proceeds to step 26, and similarly to step 25, it is determined whether or not the cranking elapsed time t has reached a preset time t2 (t = t2). If the elapsed time t has reached the set time t2 (t = t2), the process proceeds to step 28, where the battery discharge current I2 and the battery terminal voltage V2 are obtained based on the signals from the current detector 11 and the voltage detector 12. If the elapsed time t does not reach the set time t1 or the set time t2 in the steps 25 and 26, the process returns to the step 24 and the measurement of the elapsed time is continued. In step 29, the internal resistance R and the battery open-circuit voltage V are obtained from the battery discharge currents I1, I2 and the battery terminal voltages V1, V2 obtained in steps 27 and 28.
0 is calculated by the following equations (1) and (2).

[0027]

R = | (V2-V1) / (I2-I1) | (Formula 1) V0 = V1-RI1 (Formula 2) where R: internal resistance V0: battery release voltage

The reason why the calculation is performed at the time of cranking is that when the internal combustion engine is operating (when the engine is running), the generator linked to the internal combustion engine is generating power, and This is because the power generator 3 has a regenerative action of electric power by the generator, and a true discharge current value and a terminal voltage value from the battery 3 cannot be obtained.

In step 30, the current battery characteristics are obtained from the calculated internal resistance R and open circuit voltage V0 in the same manner as line 104 in FIG. In steps 31 and 32, it is determined whether the obtained battery characteristics belong to any of the deterioration determination areas in FIG. In step 31, it is determined whether or not the characteristic is in the "normal" region. In step 32, it is determined whether or not the characteristic is in the "attention" region.
In steps 4 and 35, the diagnosis result is obtained by distinguishing between “normal”, “caution”, and “abnormal”. Further, the respective diagnostic results are displayed on the display device 5.

Next, a battery deterioration diagnosis apparatus according to another embodiment of the present invention will be described. The battery deterioration diagnosis apparatus according to the embodiment is applied to an idle stop vehicle that automatically stops an internal combustion engine that is operating according to the situation of a vehicle.

FIG. 8 is an overall control block diagram in which the control system of the idle stop vehicle is applied to the control system of the vehicle control device including the battery deterioration diagnosis device of FIG. That is, the control system shown in FIG. 1 includes a vehicle situation detecting section 8 for detecting the situation of the vehicle, an internal combustion engine stopping device 6 for stopping the operating internal combustion engine 1, and an internal combustion engine based on information from the vehicle situation detecting section 8. A vehicle control device including an internal combustion engine control unit 7 for controlling a stop device is added.

The result of the diagnosis made by the judging unit 15 (see FIG. 3) of the battery deterioration diagnosing device 4 of the control system is transmitted to the vehicle condition detecting unit 8 and becomes one of the vehicle condition detecting data. The internal combustion engine control unit 7 determines whether or not to perform idle stop based on the vehicle status detection data from the vehicle status detection unit 8. In the case of the idle stop determination, the internal combustion engine stop device is activated to activate the idle stop. Stop state. The idle stop permission condition in the internal combustion engine controller 7 is as follows.

1) The wheel speed is zero. 2) The engine speed is the speed at idling. 3) The cooling water temperature is higher than a specified value. 4) Foot brake or side brake is applied. 5) The battery deterioration diagnosis result is “normal”. 6) The gear position is neutral. 7) The clutch is not engaged. 8) The accelerator is not depressed.

As described in item 5) of the above condition,
In the battery deterioration diagnosis result, only the “normal” state is set as the idle stop permission condition. FIG. 9 is a control flowchart showing a control state of the idle stop vehicle from normal running to idle stop in the control system of FIG.

Steps 61 to 62 for normal running
The program proceeds to step 62, where it is determined whether or not the idle stop permission condition is satisfied. If all the idle stop permission conditions are satisfied, the routine proceeds to step 63, where the internal combustion engine stopping device 6 is operated, and the vehicle is brought into the idle stop state at step 64. As described above, the two embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various designs may be made without departing from the spirit of the present invention described in the appended claims. Can be changed.

[0036]

As will be understood from the above description, the vehicle battery deterioration diagnosis apparatus according to the present invention grasps the deterioration state from the characteristics of the battery liquid temperature, the terminal voltage and the discharge current. Accurate diagnosis suitable for
In addition, since the deterioration state is diagnosed at the time of cranking at the start of the internal combustion engine, the deterioration of the battery can be detected before the vehicle travels, and it is possible to cope with a traveling obstacle due to a shortage of the battery capacity.

Further, since the current detecting section (sensor), the voltage detecting section (sensor), and the temperature detecting section (sensor) are all provided integrally near the battery positive terminal, an accurate battery discharging current and The terminal voltage and liquid temperature can be detected, the space is small, and it can be easily removed when replacing the battery. Furthermore, since the temperature detecting section is mounted in the battery liquid insertion port of the battery, it is not necessary to remodel the battery to newly mount the temperature detecting section, and the battery can be easily removed.

Furthermore, since the current detecting section is mounted on the conductive member connected to the battery positive terminal, removal is easy. Furthermore, since the current detecting section is a Hall element type current sensor, there is no risk of heat generation or burning when a large current is supplied.

Further, the deterioration judgment area for each battery fluid temperature in the storage unit is a characteristic of the discharge current and the terminal voltage with respect to each battery fluid temperature, and includes three areas of "normal", "caution", and "abnormal" or more. Since it can be divided into regions, the determination unit can qualitatively grasp the deterioration state. Furthermore, when the battery deterioration diagnosis device is applied to an idle stop vehicle,
The determination result is sent to the vehicle status detection unit, and becomes one of the idle stop permission conditions only when the status is "normal", so that a state in which the battery cannot be restarted due to an abnormality in the battery can be avoided.

[Brief description of the drawings]

FIG. 1 is a control block diagram showing a control system including a vehicle battery deterioration diagnosis device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state where each detection device of the vehicle battery deterioration diagnosis device of the embodiment of FIG. 1 is mounted on a battery;

FIG. 3 is a control block diagram of the vehicle battery deterioration diagnosis device of FIG. 1;

FIG. 4 is a graph showing drooping characteristics of a discharge current and a terminal voltage with the battery temperature as a parameter.

FIG. 5 is a diagram showing a drooping characteristic of a discharge current and a terminal voltage when a battery liquid temperature is T ° C., and a deterioration determination region.

6 is a control flowchart of the vehicle battery deterioration diagnosis device of FIG.

FIG. 7 is a control flowchart of the vehicle battery deterioration diagnosis device of FIG. 3, and is a latter part of the flowchart.

FIG. 8 is a vehicle battery deterioration diagnosis device according to another embodiment of the present invention, which is a control system of a vehicle control device including the battery deterioration diagnosis device of FIG. 1; FIG. 1 is an overall control block diagram to which is applied.

FIG. 9 is a control flowchart of the vehicle battery deterioration diagnosis device of FIG. 8;

[Description of Signs] 1 ... internal combustion engine, 2 ... internal combustion engine starting device, 3 ... battery, 4 ... battery deterioration diagnosis device, 5 ... indicator, 6
... internal combustion engine stop device, 7 ... internal combustion engine control unit, 8 ... vehicle condition detection unit, 11 ... current detection unit, 12 ... voltage detection unit, 13 ... temperature detection unit, 14 ... calculation unit, 15 ... determination unit, 16 ... Storage unit, 17 ... cranking determination unit,
32: temperature sensor 33: input / output line for temperature sensor
34 ... battery liquid insertion port, 35 ... sealing means, 36 ...
Temperature sensor lower end, 37 ... Battery positive terminal, 38
... copper plate, 39 ... current sensor, 40 ... harness, 4
1: signal line, 42: connecting means

Claims (8)

[Claims] An internal combustion engine includes: a battery; a calculation unit for calculating battery characteristics from a terminal voltage and a discharge current of the battery; a determination unit for determining a battery deterioration state based on the battery characteristics and battery fluid temperature; A battery diagnostic device for a vehicle, comprising: a cranking determining unit that determines that the starting device is cranking; wherein the determining unit determines whether the battery deteriorates during cranking based on the determination by the cranking determining unit. A vehicle battery diagnostic device for determining a state. 2. The battery diagnostic device according to claim 1, further comprising a storage unit storing a deterioration determination area for each battery fluid temperature, wherein the determination unit determines a battery deterioration based on the deterioration determination area stored in the storage unit. The vehicle battery diagnostic device according to claim 1, wherein the state is determined. 3. The deterioration judging area for each battery fluid temperature in the storage unit is a characteristic of a discharge current and a terminal voltage for each battery fluid temperature, and is a three areas of "normal", "caution", and "abnormal" or more. The vehicle battery diagnostic device according to claim 1, wherein the vehicle battery diagnostic device is divided into a number of regions. 4. A battery current sensor, voltage sensor,
The vehicle battery diagnostic device according to any one of claims 1 to 3, wherein the temperature sensor and the temperature sensor are all provided integrally near a positive terminal of the battery. 5. The vehicle battery deterioration diagnosis apparatus according to claim 4, wherein the temperature sensor is mounted on a battery liquid insertion port of the battery. 6. The vehicle battery deterioration diagnosis apparatus according to claim 4, wherein the current sensor is mounted on a conductive member connected to a positive terminal of the battery. 7. The vehicle battery deterioration diagnosis apparatus according to claim 6, wherein the current sensor is a Hall element type. 8. A vehicle control device comprising the battery deterioration diagnosis device according to claim 1, wherein the vehicle control device includes a vehicle condition detection unit, an internal combustion engine control unit, Wherein the vehicle condition detection unit inputs a determination result of the battery deterioration state of the battery deterioration diagnosis device, and the internal combustion engine control unit determines the determination result of the battery deterioration state as one of idle stop permission conditions. A control device for a vehicle, characterized in that when the permission condition is satisfied, the internal combustion engine stopping device is operated to enter an idle stop state.