JP2003214248A - Battery deterioration detector of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery deterioration detector of a vehicle, for detecting the deterioration of a battery mounted on the vehicle. <P>SOLUTION: When the battery is deteriorated, the falling slope of a battery voltage becomes larger than that of a normal battery when an electric load is applied thereto. As shown in Fig. 10 (a), when the electric load Vld is inputted, the varied amount of a battery voltage between a time T1 and a time T2 is calculated as shown in Fig. 10 (b). The calculated varied amount of the battery voltage is compared with a specified determination value. When the value exceeds the specified determination value, the battery is determined to be deteriorated. Thus the deterioration of the battery is accurately detected according to the input of the electric load Vld. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deterioration warning device for a battery mounted on a vehicle.

[0002]

2. Description of the Related Art It has been conventionally known that when a battery mounted on a vehicle is deteriorated, a starting failure or an engine stall due to the exhaustion of the battery occurs.

On the other hand, in the technology of the vehicle battery deterioration warning device disclosed in Japanese Patent Laid-Open No. 7-63114, a system down occurs due to a voltage drop, especially in a vehicle equipped with a small battery. As disclosed, it is disclosed that the battery voltage is detected at the time of starting, and when the voltage falls below a set value within a predetermined range, a warning process is executed.

[0004]

However, in the technique disclosed in Japanese Unexamined Patent Publication No. 7-63114, only the voltage drop of the battery is detected, and the deterioration over time is detected as the deterioration of the battery. I can't. That is, only by detecting the battery voltage, it is not possible to determine whether the battery voltage has dropped due to deterioration of the battery over time or the battery charge amount has dropped and the battery voltage has dropped. Incidentally, this Japanese Patent Laid-Open No. 7-63
Japanese Patent Publication No. 114 does not disclose any description regarding deterioration of the battery over time. Therefore, JP-A-7-63114
When the technology of the publication is applied to an internal combustion engine, the warning is issued only on the basis of the voltage drop of the battery, so even if the battery does not actually deteriorate with time, it will start due to the deterioration of the battery with time. If a defect or engine stall occurs, there is a risk that a warning will be issued by mistake.

Therefore, an object of the present invention is to detect the deterioration of the battery over time as the deterioration of the battery with high accuracy to promptly warn the driver of a situation such as a start failure or an engine stall due to the exhaustion of the battery. Another object of the present invention is to provide a battery deterioration warning device for a vehicle.

[0006]

According to the results of experiments conducted by the inventors of the present invention, it has been clarified that the deterioration with time of the battery depends on the voltage change of the battery. More specifically, the deterioration of the battery over time is a phenomenon in which the charge capacity of the battery decreases and the voltage output instantaneously decreases. Even if the decrease of the charge capacity of the battery and the decrease of the output voltage instantaneously occur independently, even if they independently occur, the following phenomenon occurs as the change of the output voltage of the battery voltage with respect to the electric load. . Compared with the output of the battery voltage before the deterioration with time, the slope of the drop of the battery voltage becomes large and the amount of the drop of the battery voltage increases.

Therefore, according to the first aspect of the invention, when the electric load is input, the voltage change of the battery voltage detected thereafter is calculated, and the calculated voltage change of the battery voltage and the predetermined judgment value are calculated. The battery deterioration is determined by comparing

Thus, the deterioration of the battery is detected based on the voltage change when the electric load is input and the predetermined judgment value, so that the deterioration with time of the battery can be accurately detected.

As the electric load, an air conditioner for adjusting the temperature inside the vehicle, as in the invention of claim 2,
At least one of the power steering devices for assisting the steering operation force by the driver is preferable.

Thus, when the electric load generated by driving the air conditioner or the power steering is input, the deterioration of the battery can be determined by the voltage change of the battery voltage. Further, in particular, in the case where the input signal of the air conditioner switch is input to the microcomputer, the battery deterioration determination means is executed according to the presence or absence of the input signal to appropriately determine the battery deterioration every time the electric load by the air conditioner is input. Can be executed.

By the way, as described above, the deterioration with time of the battery depends on the slope of the voltage change of the battery and on the other hand, on the amount of drop of the battery voltage with respect to the electric load. Therefore, in the inventions of claim 3 and claim 4, a specific method of the voltage change amount calculating means is shown.
In the voltage change amount calculating means of the third aspect, the voltage change of the battery is calculated based on the voltage change of the battery voltage for a predetermined period immediately after the electric load is input. Similarly, the voltage change amount calculating means of claim 4 calculates the voltage change of the battery based on the battery voltage immediately before the electric load is input and the minimum battery voltage after the electric load is input.

With this configuration, by using the voltage change amount calculating means according to the third aspect, it is possible to detect the deterioration of the battery over time as the change of the voltage in a predetermined period, that is, the slope of the voltage change, so that the deterioration of the battery can be accurately performed. Can be detected. Further, by using the voltage change amount calculating means of the fourth aspect, it is possible to detect deterioration of the battery over time as a drop in the voltage with respect to the electric load, and therefore it is possible to accurately detect deterioration of the battery.

By the way, the deterioration of a battery over time changes depending on its temperature. Specifically, the higher the temperature of the battery, the larger the charging capacity and the instantaneously output power, and the lower the battery temperature, the lower the charging capacity of the battery and the instantaneously output power.

Therefore, as described in the invention of claim 5, the predetermined judgment value is corrected based on the temperature of the battery or a parameter having a correlation with the temperature. As a result, even if the charge capacity of the battery and the instantaneous power of the battery change depending on the temperature change of the battery, the predetermined judgment value can be corrected based on the temperature, so that the deterioration of the battery can be accurately judged. You can

Further, according to the invention of claim 6, the deterioration determination of the battery is executed when the temperature of the battery or a parameter correlated with the temperature is within a predetermined range. If the temperature of the battery is too high or too low, it may not be possible to accurately determine the deterioration of the battery. Therefore, the battery deterioration can be accurately determined by executing the battery deterioration determination only within the predetermined range.

By the way, when the deterioration of the battery is judged only once, the deterioration of the battery is judged by the voltage change immediately after the electric load is input. However, if noise is superimposed on the voltage at this time, the battery deterioration determination may not be performed accurately.

Therefore, when the deterioration of the battery is determined, the number of times the deterioration is determined is counted, and when the count value exceeds a predetermined number, the battery is finally deteriorated. Determine that

As a result, the battery deterioration determination is executed a plurality of times, and when the result of the determination is that the battery deterioration is determined to be the predetermined number or more, it is finally determined that the battery is deteriorated. The deterioration can be accurately executed.

Further, according to the invention of claim 8, the battery deterioration determining means prohibits charging of the battery when the deterioration of the battery is judged based on the voltage value when the electric load is input. As a result, the influence of the charging voltage of the battery charging means is not exerted, so that the deterioration of the battery can be accurately determined.

Further, according to the invention of claim 9, claim 7 is provided.
The battery is charged every time the battery deterioration determining means determines that the battery is deteriorated. As a result, the charging is executed when the deterioration of the battery is determined, so that the battery capacity can always be maximized for each determination of the battery deterioration. Therefore, when the battery deterioration determination is executed, the battery deterioration determination can be always executed under the same condition, and the battery deterioration determination can be executed accurately.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> An embodiment of the present invention will be described below with reference to the drawings. First, an overall schematic configuration diagram of the engine control system will be described with reference to FIG. An air cleaner 13 is provided on the most upstream side of an intake pipe 12 of an engine 11 which is an internal combustion engine, and an air flow meter 14 for detecting the intake air amount is provided downstream of the air cleaner 13. In addition, this air flow meter 1
An intake air temperature sensor for detecting the intake air temperature is built in 4 and the intake air temperature supplied to the combustion chamber is detected by the intake air temperature sensor. Further, on the downstream side of the air flow meter 14, a throttle valve 15 whose opening is adjusted by a DC motor or the like and a throttle opening sensor 16 which detects the throttle opening are provided.

Further, a surge tank 17 is provided on the downstream side of the throttle valve 15.
7, an intake pipe pressure sensor 18 for detecting the intake pipe pressure is provided. Further, the surge tank 17 is provided with an intake manifold 19 for introducing air into each cylinder of the engine 11, and a fuel injection valve 20 for injecting fuel is attached near the intake port of the intake manifold 19 of each cylinder. There is. Further, a spark plug 21 is attached to the cylinder head of the engine 11 for each cylinder, and the air-fuel mixture supplied into the cylinder is ignited by the spark discharge of each spark plug 21.

The intake valve 28 and the exhaust valve 29 of the engine 11 are provided with variable valve timing mechanisms 30 and 31 for varying the valve timing. Further, the intake valve 28 and the exhaust valve 29 may be provided with a variable valve lift mechanism that varies the valve lift amount of each valve.

On the other hand, the exhaust pipe 22 of the engine 11 is provided with a catalyst 23 such as a three-way catalyst for purifying CO, HC, NOx, etc. in the exhaust gas, and the exhaust gas is provided upstream of the catalyst 23. Air-fuel ratio sensor 24 (linear air-fuel ratio sensor, oxygen sensor, etc.) that detects the air-fuel ratio or rich / lean
Is provided. Further, in the cylinder block of the engine 11, a cooling water temperature sensor 25 for detecting the cooling water temperature,
Crank angle sensor 26 for detecting the rotation speed of the engine
Is attached.

The outputs of these various sensors are input to an engine control circuit (hereinafter referred to as "ECU") 27. The ECU 27 is driven by using the voltage from the battery 32 and connects one wiring to the ground and the other wiring to the ECU 27. The ECU 27 determines the injector 20 and the spark plug 21 based on the above-mentioned various sensor signals.
Control is performed to control the engine 11, and when the charge capacity of the battery is reduced based on the voltage signal of the battery 27, the warning lamp 33 is turned on to warn the driver of the deterioration of the battery. .

Next, a schematic configuration diagram of the ECU 27 is shown in FIG.
Will be explained. First, the battery voltage of the battery 32 and the various sensor signals shown in FIG.
It is input to the / D conversion unit 34. Here, the A / D converter 3
At 4, the input analog signal is converted into a digital signal, and the converted digital signal is output to the determination processing unit 35. The determination processing unit 35 includes a memory unit 36 including a read only memory (ROM) and a random access memory (RAM) arranged in the ECU 27.
Calls the data of as needed. And engine 1
Fuel injection amount and ignition timing for control of 1, intake valve 2
The opening timing of 8 and the closing timing of the exhaust valve 29 are calculated and output to the output unit 36, respectively.
0, spark plug 21, intake valve 28, exhaust valve 29
The engine 11 is accurately controlled by appropriately driving the engine according to the operating state of the engine 11.

On the other hand, the judgment processing section 35 carries out the judgment of battery deterioration, which is a feature of this embodiment. In the battery deterioration determination, the determination processing unit 35 uses the A / D conversion unit 34.
The deterioration of the battery is detected based on the battery voltage signal digitally converted by and the data called from the memory unit 37 as appropriate, and a signal for lighting the warning lamp 33 is output to the output unit 36.

Next, the program relating to the battery deterioration warning of the present embodiment will be described in detail with reference to the drawings. In the present embodiment, the driver is warned of the charge capacity of the battery and the drop of the instantaneous voltage of the battery as the deterioration of the battery, and FIG. 3 shows a main program of the battery deterioration warning. This program is a program that is started every predetermined crank angle of the engine (in the case where the engine ECU 27 includes a timer, it may be started every predetermined time).

First, in step S100, a counter Count for counting the number of temporary determinations of battery deterioration is performed.
reset t. When the process of step S100 is completed, the process proceeds to step S200, where the intake air temperature THA detected by the intake air temperature sensor built in the air flow meter 14 is set in a preset temperature range (THAmin <
It is detected whether THA <THAmax). This temperature range is a temperature range set in order to carry out an accurate deterioration determination because the battery voltage depends on the temperature.
THAmin is the lower limit of intake air temperature, and THAmax
Is the upper limit of intake air temperature.

In this step S200, the intake air temperature THA
If is out of the temperature range for battery determination, the routine is finished as it is. On the other hand, if it is determined that the intake air temperature THA is within the temperature range for battery determination, the process proceeds to step S300, and the voltage change ΔVb due to the electric load is increased.
Perform measurement processing. At this time, the charging of the battery 32 may be prohibited to eliminate the influence of the voltage due to the battery charging. This process is started by executing the subroutine shown in FIG. In this subroutine, a process of detecting a decrease in charge capacity and a decrease in instantaneous voltage of the battery as deterioration of voltage with time is executed. When detecting a drop in the charge capacity or a drop in the instantaneous voltage, it is determined whether the remaining charge level is low or the battery's charge capacity is low or the instantaneous voltage is low, even if it is determined only by the voltage value. Can not do it. However, according to the experimental results by the inventors of the present invention, the decrease in the charge capacity of the battery and the instantaneous voltage of the battery have an influence on the slope and the amount of decrease in the battery voltage when an electric load is input. It was clarified.

Therefore, in the subroutine of FIG. 4, the deterioration with time of the battery is detected based on the slope of the drop of the battery voltage. First, in step S310, the voltage signal V from the battery 32 is detected, and the process proceeds to step S320. In step S320, it is determined whether or not there is an electric load Vld. As a method of determining the presence or absence of the electric load Vld, it may be determined whether an air conditioner switch of an air conditioner (not shown) is turned on, or whether the voltage signal V has changed significantly.

If the electric load Vld is not input in step S320, the process proceeds to step S330.
The voltage signal V is input as the voltage value Vfr before the change of the voltage signal V and stored in the memory unit 36. This process is repeatedly executed until the electric load Vld is input, and the voltage value Vfr before the change is updated. On the other hand, step S320
If it is determined that the electric load Vld is input, the process proceeds to step S340. In step S340, it is determined whether a predetermined period has elapsed since the electric load Vld was input. If the predetermined period has not elapsed, the process proceeds to step S350, and the voltage signal V is the minimum voltage value Vmin.
Is smaller than. The minimum voltage value Vmin is
It is a value that is repeatedly updated within a predetermined period, and a value that exceeds the maximum value of the battery voltage is input as the initial value.

If the voltage signal V is equal to or higher than the minimum value Vmin of the battery voltage in this step S350, this routine is finished as it is. On the other hand, if it is smaller than the voltage signal V in step S350, the determination in step S350 is negative (NO), and the process proceeds to step S360. In step S360, the current voltage signal V is input to the minimum value Vmin of the battery voltage, and this routine ends.

On the other hand, in step S340, the electric load V
If the period from the input of ld exceeds the predetermined period, the process proceeds to step S370. In step S370, in order to calculate the voltage change according to the electric load Vld, by subtracting the minimum value Vmin of the voltage signal within a predetermined period from the voltage signal Vfr immediately before the electric load Vld is input,
The slope of the voltage drop per predetermined period, that is, the voltage change ΔVb is calculated, the present routine is terminated, and the process proceeds to step S400 of the main program in FIG.

At step S400, it is determined whether or not the calculated voltage change ΔVb is larger than a preset determination value ΔVerr. As described above, the deterioration of the battery over time depends on the value of the voltage change ΔVb. Therefore, the determination value ΔVerr is set to a value for detecting deterioration of the battery over time due to conformity or the like. Here, when the voltage change ΔVb is equal to or less than the determination value ΔVerr, it is determined that the influence of the deterioration of the battery over time is small, and this routine is ended.
When the voltage change ΔVb is larger than the determination value ΔVerr, the process proceeds to step S500.

In step S500, when the voltage change ΔVb is larger than the determination value ΔVerr, it is temporarily determined that the degree of deterioration of the battery over time is large, and the counter Count for counting the number of temporary determinations of battery deterioration is incremented. And proceeds to step S600. Then, in step S600, it is determined whether or not the counter Count is larger than the preset number of determinations Cerr. Here, the temporary determination number of battery deterioration is the determination number Ce
If it is less than or equal to rr, the process proceeds to step S800 and the battery charging process is executed.

Here, the battery charging process will be described. The charging control of the battery 32 normally transmits the rotation of a timing pulley (not shown) of the engine 11 to an alternator (not shown) via a timing belt (not shown). Then, the alternator is rotated by the timing belt to generate a magnetic field and finally generate electric power to charge the battery 32. However, when the voltage of the battery 32 is equal to or higher than a predetermined value and the operating state of the engine 11 is acceleration or fuel cut, the battery 32 is
Assuming that the charging of the battery 32 is unnecessary, the charging of the battery 32 is cut by turning off a relay switch (not shown) of the alternator in order to prohibit the charging of the battery 32. In the battery charging process of the present invention, the control for cutting the power generation by the alternator such as fuel cut is prohibited, and the charging control for the battery 32 is prioritized.

When the battery charging process of the present invention is completed in this way, step S20 of the main program shown in FIG.
Returning to 0, the voltage change ΔVb due to the electric load Vld is calculated again, and it is determined in step S400 whether this value is larger than the preset determination value ΔVerr. As a result, when the state of charge of the battery is restored by the battery charging process in step S800, this routine is finished as it is, and when the next electric load Vld is input, the number of times of temporary determination of battery deterioration is determined in step S100. The counter Count that counts is reset.

On the other hand, the state of charge of the battery is not recovered even by the battery charging process in step S800, and the voltage change ΔVb with respect to the electric load Vld is still the determination value Δ.
If it is larger than Verr, the counter Co that counts the number of temporary determinations of battery deterioration in step S500
unt is incremented. Then, step S6
If the value of the counter Count is larger than the preset determination count Cerr at 00, step S
The routine proceeds to 700, the warning lamp 33 is turned on, and this routine is ended.

As described above, in order to determine the deterioration over time as the deterioration determination of the battery 32, the charging process for the battery 32 is executed every time the temporary determination of the deterioration of the battery 32 is performed. Then, despite the charging process, the battery 32
When the value of the counter Count becomes larger than the number of determinations Cerr after the number of temporary determinations of the deterioration of the battery 32 is incremented, it is determined that the battery 32 has deteriorated with time, and thus the charge capacity of the battery 32 is reduced or the battery 32 instantaneously decreases. A voltage drop can be detected.

Next, the voltage change ΔV used in this embodiment
The detection method of b will be described with reference to the time chart shown in FIG. FIG. 10A shows the electric load Vld. When this electric load Vld is switched from the off state to the on state at time T1, the voltage signal V drops in accordance with the degree of deterioration of the battery 32 over time, as shown in FIG. On the other hand, in the present embodiment, a predetermined period is set, the minimum value Vmin of the voltage signal V in the predetermined period is detected, and the deviation from the value Vfr immediately before the electric load Vld is input is calculated. This deviation is the voltage change ΔVb from time T1 to time T2. Since the value of the voltage change ΔVb during this predetermined period increases in accordance with the degree of deterioration of the battery 32 over time, the deterioration over time as battery deterioration is accurately determined by comparison with a preset determination value ΔVerr. can do.

As a method of determining the deterioration of the battery 32 over time, a method based on the time chart shown in FIG. 11 may be used. FIG. 11 (a) is shown in FIG. 10 (a).
And the state of the electric load Vld is shown. When the electric load Vld is input and the voltage signal V drops at time T3 as shown in FIG. 11 (b), it becomes the minimum value Vmin of the voltage signal V at time T4. This time T3 and time T
The amount of voltage drop with 4 may be the voltage change ΔVb.

That is, since the degree of deterioration of the battery 32 with time depends on the amount of drop of the voltage load with respect to the electric load Vld, the degree of deterioration of the battery 32 with time can be accurately calculated by calculating the voltage change ΔVb by the above method. Can be detected. At this time, the preset judgment value ΔVerr is also the voltage change ΔV by this method.
It goes without saying that it is set as a value for determining b.

Further, in the present embodiment, the temperature of the battery 32 is substituted on the basis of the intake air temperature THA by the intake air temperature sensor in order to judge whether or not the deterioration of the battery 32 is to be judged. A temperature sensor may be provided and it may be determined whether or not to perform the battery deterioration determination based on the temperature sensor provided in the battery 32.

<Second Embodiment> In the present embodiment,
It is characterized in that the determination value ΔVerr is corrected based on the battery temperature, focusing on the fact that the decrease in the charge capacity of the battery 32 and the decrease in the instantaneous voltage depend on the battery temperature. Hereinafter, description will be made with reference to the flowchart of FIG. The first
The same processes as those of the embodiment are given the same reference numerals, and the description thereof will be omitted. Only different processes will be described. First, in step S210, the determination value ΔVerr is corrected based on the intake air temperature detected by the intake air temperature sensor. The higher the temperature, the larger the battery charge capacity and instantaneous voltage,
The lower the battery temperature, the smaller it becomes. Therefore, the determination value ΔVerr is corrected so that the determination value ΔVerr becomes smaller as the intake air temperature becomes higher, and the determination value ΔVerr becomes lower as the intake air temperature becomes lower than the determination value ΔVerr set at room temperature.
Is corrected so that

As described above, by correcting the determination value ΔVerr for determining the deterioration of the battery 32 with time, the correction value ΔVerr is corrected according to the intake air temperature, so that the battery charging capacity and the instantaneous voltage change according to the battery temperature. The battery deterioration can be detected with high accuracy. Instead of the intake air temperature, a temperature sensor may be provided directly on the battery 32 to detect the battery temperature.

(Other Embodiments) The flowchart of FIG. 6 is a program for determining the deterioration of the battery 32 over time, and the intake air temperature detected by the intake air temperature sensor is set to a predetermined value as compared with the first embodiment. Whether or not it is a region is not judged. In this way, the deterioration determination of the battery 32 may be simply performed.

Further, in the flowchart of FIG. 7, the provisional determination of deterioration of the battery 32 is not performed, as compared with the second embodiment.
Step S70 based on the comparison result of the voltage change ΔVb when the electric load Vld is input and the determination value ΔVerr.
The warning process of 0 may be executed.

Further, the flowchart of FIG. 8 is different from the first embodiment in that the provisional determination of deterioration of the battery 32 is not performed,
Step S70 based on the comparison result of the voltage change ΔVb when the electric load Vld is input and the determination value ΔVerr.
The warning process of 0 may be executed.

Further, in the flowchart of FIG. 9, the voltage change ΔVb due to the electric load Vld is calculated, and the voltage change ΔVb is calculated.
The warning process in step S700 may be executed based on Vb and the determination value ΔVerr.

In the deterioration determination programs of FIGS. 6 to 9, the voltage change ΔVb due to the electric load Vld is also used.
The calculation method may be performed by any one of the methods shown in the time charts of FIGS. 10 and 11, and the deterioration over time may be detected based on the parameter that changes according to the temperature of the battery 32. You can

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of the present invention.

FIG. 2 is a control block of an ECU of the present invention.

FIG. 3 is a main program according to the first embodiment of the present invention.

FIG. 4 is a voltage change Δ in the first embodiment of the present invention.
It is a program for calculating Vb

FIG. 5 is a main program according to the second embodiment of the present invention, which is a determination value ΔVer for determining deterioration.
This is a program for correcting r based on the intake air temperature.

FIG. 6 is a main program for determining deterioration of a battery over time according to the present invention and other embodiments.

FIG. 7 is a main program for determining deterioration of a battery over time according to the present invention and other embodiments.

FIG. 8 is a main program for determining deterioration of a battery over time in the present invention and other embodiments.

FIG. 9 is a main program for determining deterioration of a battery over time in the present invention and other embodiments.

FIG. 10 is a time chart showing calculation of voltage change ΔVb.

FIG. 11 is a time chart showing calculation of voltage change ΔVb.

[Explanation of symbols]

11 ... Engine (internal combustion engine), 15 ... Throttle valve, 20 ... Fuel injection valve, 21 ... Spark plug, 26 ... Crank angle sensor, 27 ... ECU, 28 ... intake valve, 29 ... Exhaust valve, 30, 31 ... Variable valve timing mechanism, 32 ... Battery, 33 ... Warning light.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3G084 DA27 EA11 EB23 FA03                 5G003 BA01 DA04 DA17 EA06 EA08                       GC05                 5H030 AA03 AA04 AS08 BB01 FF43                       FF44

Claims (9)

[Claims] 1. A battery deterioration determination device for a vehicle, comprising: a battery mounted on the vehicle; and an electric load driven by using the voltage of the battery; battery voltage detection means for detecting the voltage of the battery; A battery voltage change calculating means for calculating a voltage change of the battery voltage detected by the battery voltage detecting means when the electric load is input; and a voltage change of the battery voltage calculated by the battery voltage change calculating means and a predetermined value. A battery deterioration determination device for a vehicle, comprising: a battery deterioration determination means for determining battery deterioration based on a determination value. 2. The electric load is an air conditioner for adjusting a temperature in a vehicle compartment, a power steering device for assisting an operation force of a steering operation by a driver, a headlight,
The vehicle battery deterioration determination device according to claim 1, wherein at least one of a brake lamp and a radiator fan is provided. 3. The voltage change calculation means calculates the voltage change of the battery based on the voltage change of the battery voltage detected by the battery voltage detection means immediately after the electric load is input for a predetermined period. The battery deterioration determination device for a vehicle according to claim 1, wherein the device is a battery deterioration determination device. 4. The voltage change calculation means detects the battery voltage detected by the battery voltage detection means immediately before the electric load is input, and the battery voltage detection means detected by the battery voltage detection means after the electric load is input. The battery deterioration determination device for a vehicle according to claim 1, wherein the battery voltage change is calculated on the basis of the minimum battery voltage. 5. The method according to claim 1, wherein the predetermined determination value is corrected based on a temperature of the battery or a parameter correlated with the temperature. Vehicle battery deterioration determination device. 6. The battery deterioration determination means performs the determination when the temperature of the battery or a parameter having a correlation with the temperature is within a predetermined range. The battery deterioration determination device for a vehicle according to one. 7. The battery deterioration determining means comprises battery deterioration counting means for counting deterioration of the battery, and finally when the count value counted by the battery deterioration counting means exceeds a predetermined number of times. The battery deterioration determination device for a vehicle according to claim 1, wherein the deterioration of the battery is determined. 8. A battery charging unit for recovering the charge of the battery, wherein the battery deterioration detecting unit prohibits charging of the battery by the battery charging unit when the electric load is input. The battery deterioration determination device for a vehicle according to any one of claims 1 to 7. 9. A battery charging means for recovering the charge of the battery is provided, and the battery charging means charges the battery every time the deterioration of the battery is counted by the battery deterioration determining means. The battery deterioration determination device for a vehicle according to claim 7.