JP2003035176A - Battery-mounted vehicle, vehicle having idling stop function, and device for and method of determining condition of battery mounted on the vehicle having idling stop function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely determine the condition of a battery mounted on a vehicle with a simple constitution, without depending on the type of battery. SOLUTION: When the charging and discharging are performed from the battery 1 mounted on the vehicle to an alternator 2, starter 3 and electrical equipment load 4, the charge/discharge currents are detected by a current detector 6, and then they are integrated in a period from the start or restart of the starter 3 to next restart by a device 8 for determining battery charging condition. By comparing the integrated value with the threshold level of balanced amount of preset charge/discharge currents, the charged condition or remaining capacity of the battery 1 is determined. An idling stop treatment means 7 determines whether or not engine stop is performed when the vehicle is stopped or temporarily stopped according to the charged amount or remaining capacity of the battery 1 determined by the device 8; when it is possible to stop, the engine is stopped and the starter 3 is activated, when restarting the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for calculating the state of charge of a storage battery in a vehicle such as an automobile equipped with the storage battery, and a method for determining the state of charge of a vehicle storage battery having an idling stop function.

[0002]

2. Description of the Related Art Various methods have been developed for inspecting the state of charge and deterioration of a storage battery. For example, a method is known in which a storage battery is completely discharged, the capacity is measured, and the deterioration state is determined from the capacity. However, this method is not a practical method because it is difficult to apply this method to a storage battery in use because the storage battery needs to be completely discharged and the measurement time is long. In particular, it is extremely difficult to use this method for automobile storage batteries. Therefore, various methods for inspecting the storage battery in a short time have been developed. An example of such a method is given below.

When the storage battery to be inspected is a lead storage battery, as an example of a method for performing the inspection in a short time, there is known a method of inspecting the remaining capacity by using the specific gravity of the electrolytic solution of the lead storage battery as an index. However, this method has a problem in that the concentration distribution of the electrolytic solution may become non-uniform and the remaining capacity of the lead storage battery cannot be accurately obtained.

In recent years, a sealed lead-acid battery with an extremely small amount of electrolytic solution is being adopted. In such a lead-acid battery, it is theoretically difficult to measure the specific gravity of the electrolytic solution, and the residual capacity of the storage battery is inspected by the specific gravity. Is impossible.

As another method developed as a short-time inspection method for a storage battery, a method for measuring the internal impedance of the storage battery is known. As a specific example, for example, the method disclosed in Japanese Patent No. 2536257 will be described. According to the method disclosed in Japanese Patent Publication No. 2536257, the measurement result of the internal impedance of the lead storage battery is used to calculate the inductance component L of the lead storage battery, the electrolyte resistance RΩ, the charge transfer resistance R _ct , the electric double layer capacitance C _d ,
An optimum solution is obtained by applying an equivalent circuit composed of the Warburg impedance W and the Warburg coefficient σ to L, R
It is said that the life of the storage battery can be determined by comparing at least one of Ω, R _ct , C _d , W and σ with an initial value. However, when the method disclosed in Japanese Patent Publication No. 2536257 is used for inspecting the state of a lead storage battery mounted on a vehicle such as an automobile, the influence of a generator (alternator) operating with the rotation of the engine, And
Since it is difficult to measure the internal impedance of the lead storage battery due to the load fluctuation of equipment such as an electric load mounted on the vehicle, it is difficult to inspect the state of the lead storage battery. Further, the device for realizing the method disclosed in Japanese Patent Publication No. 2536257 has a problem that it is not practical to mount it on an automobile because it has a considerably large configuration and is expected to be expensive.

As another method developed as a short-time inspection method for a storage battery, a method of constantly measuring a current value discharged or charged from the storage battery and integrating the measured current values to obtain the remaining capacity of the storage battery (hereinafter, referred to as Current integration method) is known. However, in such a current integration method, the error of the integrated value (or the balance amount (hereinafter, also referred to as “balance amount” in this specification)) gradually increases due to the measurement error of the current value, and the state of the storage battery becomes accurate. There was a problem that I could not ask for.

Therefore, when the current integration method is used, the remaining capacity of the storage battery is measured by another method at an appropriate timing, and the measured value and the value of the remaining capacity obtained by integrating the current are referred to each other. , It was necessary to develop a method to correct the remaining capacity.

The development of the method for correcting the remaining capacity in the current integration method has been vigorously carried out in the development of electric vehicles. As a specific example thereof, Japanese Patent Publication No. 2791
The methods disclosed in Japanese Patent Application No. 751 and Japanese Patent Application Laid-Open No. 9-171065 will be described.

According to the method disclosed in Japanese Patent Laid-Open No. 9-171065, a data table of the terminal voltage and the remaining capacity of a storage battery in constant current discharge at a specific discharge current value is prepared in advance, and the specific discharge current is set. This is a method of obtaining the remaining capacity of the storage battery by referring to the data table for the terminal voltage at the time of becoming.

In the method for inspecting the remaining capacity of a lead storage battery for an electric vehicle by the current integration method disclosed in Japanese Patent Publication No. 2791751, the internal impedance is measured at the time of completion of full charge and at the time of temporary stop during traveling, A method is disclosed in which the value of the remaining capacity of the storage battery obtained by the current integration method is corrected by the discharge rate derived from the impedance.

[0011]

Problems to be Solved by the Invention Patent Publication No. 27917
The method disclosed in No. 51 is a useful method as an inspection method for the remaining capacity of lead acid batteries for automobiles, but it is necessary to perform the measurement by the internal impedance in addition to the measurement by the current integration method. When a measuring device that realizes the above is manufactured, the cost of the device rises, so that there is a problem that it is not suitable for mounting on a mass-produced automobile.

In order to improve this, Japanese Patent Laid-Open No. 9-1710
According to the method disclosed in Japanese Patent Laid-Open No. 65, a data table of the terminal voltage and the remaining capacity of a storage battery in constant current discharge at a specific discharge current value is prepared in advance, and the storage battery at the time of reaching a specific discharge current It is proposed that the terminal voltage be referenced to a data table to determine the remaining capacity of the storage battery. However, in a normal automobile, there is a problem that it is difficult to properly set the above specific discharge current value. That is, in an ordinary automobile, there is little chance that a specific current value that frequently continues for a certain period of time during traveling of the automobile appears, so that there is a very small chance of obtaining the remaining capacity of the storage battery. .

As a method of solving this problem, it is considered that a plurality of data tables of the terminal voltage and the remaining capacity of the storage battery are prepared so that the remaining capacity of the storage battery can be determined by a plurality of current values. However, in order to realize this method, it is necessary to prepare an extremely large amount of data, and therefore, there is a problem that the price rises to realize it and it is not suitable for application to mass-produced automobiles.

Further, in a normal automobile, the storage battery is charged from the generator (alternator) while the vehicle is running, and the terminal voltage of the storage battery rises to the output voltage of the generator. Even when the battery is temporarily stopped and a discharge current flows from the storage battery, it takes time for the terminal voltage of the storage battery to change and stabilize.

In the above method in which the terminal voltage of the storage battery when the specific discharge current is reached is referred to in the data table as described above, the remaining capacity of the storage battery is often obtained before the terminal voltage of the storage battery is stabilized. However, there is a problem that an error occurs in the obtained remaining capacity.

In order to overcome the above-mentioned problems, an object of the present invention is to provide a vehicle equipped with a storage battery, which can accurately determine the state of the storage battery, for example, the state of charge or the state of charge / discharge. is there. In particular, an object of the present invention is to provide a method and apparatus capable of accurately and easily determining the state of a storage battery mounted on a vehicle having an idling stop function. A further object of the present invention is to provide a method and apparatus that can determine the state of the storage battery, which has an idling stop function, accurately and simply without depending on the type of the storage battery mounted on the vehicle.

[0017]

Means for Solving the Problems As a result of intensive studies by the inventors of the present invention in order to solve the above problems, the following inventions have been completed. (1) Considering the period from engine start or restart to the next engine restart as one unit period, current integration is measured from the time point after engine start, and the amount of charge and discharge during running and idling stop Is added.
Considering the charge current as positive (+) and the discharge current as negative (-), if the sign of the value obtained by adding the discharge amount at the engine start to the total value of the current integration shows a positive value, This means that the capacity of the storage battery has not decreased from the time when the engine was started. Therefore, as long as the sign of the value obtained by adding the discharge amount at the engine start to the total value of the current integration shows a positive value, it is possible to determine that the engine restart can be reliably performed after the idling stop.

In particular, according to the present invention, since the integrated current value is reset when the engine is restarted after each idling stop, it is possible to avoid the problem that current measurement errors are accumulated in the conventional integrated current measurement. In the present invention,
Since the battery capacity that was able to start or restart the engine is considered as the standard for current integration, the accuracy of the engine restart judgment is high, and the engine restart after idling stop is performed without obtaining the absolute value of the battery capacity. Can be reliably determined.

Therefore, according to the first aspect of the present invention, a rechargeable storage battery, an alternator connected to the storage battery, a starter connected to the storage battery, or an inverter is connected. A starter that is, an electrical load that is connected to the storage battery, a current detector that detects a charge / discharge current when the storage battery and the alternator are charged / discharged between the starter and the electrical load, and the current. A vehicle having a storage battery charge state determination means for determining the state of charge of the storage battery based on the detection result of the detector, the storage battery charge state determination means, from the start or restart of the starter of the next starter Means for integrating the charge / discharge current detected by the current detector during the period until restart, and the charging state of the storage battery according to the integrated value Others have a means for determining the remaining capacity, the vehicle equipped with the battery is provided.

Preferably, the means for determining the remaining capacity compares the preset threshold value of the integrated value of the charging / discharging current with the integrated value of the charging / discharging current to charge the storage battery. Alternatively, the remaining capacity is determined.

Further, preferably, the threshold value of the integrated value of the charging / discharging current is in the range of 0 to +10 Ah.

More preferably, when the vehicle is stopped or temporarily stopped, it is determined whether or not the engine is stopped according to the state of charge or the remaining capacity of the storage battery which is the result of the determination by the storage battery charge state determination means. It further has an idling stop processing means for stopping these when the vehicle can be restarted and for activating the starter when the vehicle restarts.

More preferably, it is determined whether the engine is to be stopped when the vehicle is stopped or temporarily stopped according to the state of charge of the storage battery or the state of charge of the storage battery, which is the determination result of the storage battery state of charge determination means. When the vehicle is stopped or the engine is stopped while the vehicle is stopped or stopped, depending on the state of charge of the storage battery or the remaining capacity, which is the determination result of the storage battery state of charge determination means. It further includes idling stop processing means for deciding whether to start the starter and, if necessary, starting the engine while the vehicle is stopped or temporarily stopped.

According to a second aspect of the present invention, a chargeable / dischargeable storage battery, an alternator connected to the storage battery, a starter connected to the storage battery, and an electrical load connected to the storage battery. And a storage battery that determines the state of charge or the remaining capacity of the storage battery of a vehicle equipped with a current detector that detects a charge / discharge current when the storage battery charges and discharges the alternator, the starter, and the electrical load. A state of charge determination device, wherein the storage battery state of charge determination device is means for accumulating charge / discharge currents detected by the current detector in a period from the start or restart of the starter to the restart of the next starter. Further, there is provided a storage battery charge state determination device having means for determining the charge state or the remaining capacity of the storage battery according to the integrated value.

According to a third aspect of the present invention, in a vehicle having an idling stop function for stopping the engine while the vehicle is temporarily stopped, the charging current or discharging current of a storage battery mounted on the vehicle is measured. Idling, characterized by calculating the integrated value of the charging / discharging current in the period from the engine start or restart to the next engine restart, and determining the state of charge of the storage battery by the calculated integrated value of the charging / discharging current. Provided is a method for determining the state of charge of a storage battery mounted on a vehicle having a stop function.

According to a fourth aspect of the present invention, in a vehicle having an idling stop function for stopping the engine while the vehicle is temporarily stopped, the charging current or discharging current of a storage battery mounted on the vehicle is measured. Calculate the integrated value of the charging / discharging current of the storage battery during the period from engine start or restart to the next engine restart, and set the preset threshold value of the integrated value of the charging / discharging current and the charging / discharging current of the storage battery. There is provided a method for determining the state of charge of a storage battery mounted on a vehicle having an idling stop function, which is characterized by comparing and evaluating a value and determining the state of charge of the storage battery. That is, the integrated value obtained by cumulatively accumulating the charge / discharge current of the storage battery is compared and evaluated with the preset integrated value of the charging current every moment to determine the state of charge or the remaining capacity of the storage battery. The integrated value of this charge / discharge current is reset at the timing of engine restart.

Preferably, the engine can be restarted when the integrated value of the charging / discharging current of the storage battery in the period from the engine start or restart to the next engine restart is larger than a preset threshold value. It is characterized by determining that

Further, preferably, when the integrated value of the charging / discharging current of the storage battery in the period from the engine start or restart to the next engine restart is smaller than a preset threshold value, the state of charge of the storage battery is It is characterized in that processing is performed so that the value does not decrease.

The processing for preventing the state of charge of the storage battery from deteriorating includes restarting the engine, disconnecting the electrical load mounted on the vehicle from the storage battery or suppressing the power supply from the storage battery, or Includes a display that calls attention.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION A vehicle equipped with the storage battery of the present invention,
Embodiments of a vehicle having an idling stop function, a storage battery charge state determination device mounted on a vehicle having the idling stop function, and a method thereof will be described with reference to the accompanying drawings.

FIG. 1 is a graph showing a current waveform of a storage battery mounted on a vehicle having an idling stop function as an embodiment of the present invention. A vehicle having an idling stop function has a current waveform illustrated in FIG. 1 by performing processing of period 1: engine start → period 2: running → period 3: idling stop, and normally,
The cycle of period 1 → period 2 → period 3 is repeated.

When the engine is started in the period 1, a very large discharge current flows from the storage battery to the engine starter for a very short time. During traveling of period 2, electric power is supplied from the generator (alternator) mounted on the vehicle to the electrical load, and during normal traveling, charging current flows to the storage battery due to the power generation of the alternator. In the idling stop period of the period 3, the engine is temporarily stopped while the vehicle is stopped due to an intersection, traffic jam, or the like. At this time, the generator (alternator) of the vehicle is stopped, so that electric power is supplied from the storage battery to the electrical load of the vehicle. That is, the discharge current flows from the storage battery to the electrical equipment load. After idling stop, a large discharge current will flow from the storage battery to the engine starter again for restarting the engine in the period 1.

The electric capacity that can be taken out from the storage battery is also called the remaining capacity of the storage battery, and its unit is represented by the integrated value [Ah] of the current. In period 1 of FIG. 1, a very large discharge current flows from the storage battery to the engine starter for an extremely short time, so that the integrated current value during traveling in period 1 becomes −. In period 2, electric power is supplied from the generator (alternator) mounted on the vehicle to the electrical load, and during normal driving, the alternator charges the storage battery, so the charging current to the storage battery flows. , The current integrated value during traveling in the period 2 becomes +. During the period 3, idling is stopped, so that power is supplied from the storage battery to the electrical load of the vehicle, and a discharge current flows from the storage battery. As a result, the integrated current value becomes negative.

By sequentially summing the integrated current value in the period 1, the integrated current value in the period 2, and the integrated current value in the period 3, the balance of the battery capacity in and out of the process of the period 1 → the period 2 → the period 3 is calculated. It can be calculated. When the charge / discharge capacity shows +, the charge capacity is larger than the discharge capacity, and when the charge-discharge capacity is −, the discharge capacity is larger than the charge capacity. The charge state of the storage battery can be determined by comparing and evaluating a preset threshold value of the balance amount of charge / discharge current (balance amount of charge / discharge capacity) and the sequentially calculated current integrated value. it can. If the threshold value set in advance is increased indefinitely due to the problem of cumulative error due to current integration, the accuracy of the balance amount of charge / discharge current (balance amount of charge / discharge capacity) will decrease. Further, even if the same threshold value is used, a small current value, for example, about several A is integrated over a long time, and a large current value, for example, about 60 A is integrated for a short period of time. The included error rates differ. Therefore, the threshold value is most preferably 0Ah, and is preferably set between 0Ah and + 10Ah considering the margin such as charging efficiency.

When it is determined that the remaining capacity of the storage battery is equal to or more than the threshold value, it can be determined that the engine can be reliably restarted after the idling stop. If it is determined that the remaining capacity of the storage battery is less than the threshold value, it cannot be determined that the engine can be reliably restarted after the idling stop.Therefore, it is necessary to perform processing to prevent the remaining capacity of the storage battery from decreasing. preferable. For example, the display may be a restart of the engine, a disconnection of the electrical load mounted on the vehicle from the storage battery, a suppression of power supply from the storage battery, or a display for calling attention to these.

While the vehicle is traveling, a series of cycles of period 1 → period 2 → period 3 is repeated, but in a general traveling state, this charge / discharge capacity often shows +, and in practical use. By applying the determination method of the present invention, restart after idling stop can be ensured.

If the electric load in period 3 continues to be discharged for a long time due to heavy traffic, etc., the present invention is applied during the period in which the charge / discharge capacity is above the threshold value.
At the time when the charge / discharge capacity starts to show less than the threshold value, a known remaining capacity determination method may be used to determine whether or not the battery capacity required for engine restart is secured. In particular, after the point when the charge / discharge capacity starts to show less than the threshold value, the battery state of the storage battery is relatively stable because the discharge from the storage battery is relatively continuous, and in that respect Also, it is easy to apply the known remaining capacity determination method,
Highly accurate judgment is possible.

FIG. 2 shows a vehicle equipped with the storage battery of the present invention.
It is a block diagram of an embodiment. A vehicle 10 illustrated in FIG. 2 is equipped with a storage battery 1, and the storage battery 1 is connected to a bus 5
Power is supplied to the alternator 2, the starter 3, the electrical load 4, the idling stop processing means 7 and the storage battery charge state determination device 8 via the. The electric power supplied from the storage battery 1 to the alternator 2, the starter 3, the electrical load 4, the idling stop processing means 7 and the storage battery charge state determination device 8 and the electric power returned from the alternator 2 to the storage battery 1 are charged by the current detector 6. It is detected as a discharge current.

The starter 3 activates the engine to enable the vehicle to start. At this time, for a short period of time, a large starting current is supplied from the storage battery 1 as illustrated in FIG. The alternator 2 generates electric power by driving the engine during normal running of the vehicle, supplies the electric power thus generated to the electric load, or charges the storage battery 1. The electrical load 4 receives power from the alternator 2 or the storage battery 1. Examples of the electrical load 4 include various lights, air conditioners, radios, CD devices, clocks, and the like.

The storage battery charge state determination device 8 will be described in detail later, but the charge / discharge current of the storage battery 1 is monitored to detect the storage battery 1.
Calculates charge / discharge capacity or remaining capacity (measurement or judgment)
To do. The storage battery charge state determination device 8 has, for example, a microcomputer and a storage means, and uses the microcomputer to perform signal processing and arithmetic processing described in detail later.

The idling stop processing means 7 determines whether or not to stop the engine when the vehicle is stopped or temporarily stopped according to the state of charge or the remaining capacity of the storage battery 1 which is the result of the determination by the storage battery charge state determination device 8. If it is possible to stop these, they are stopped, and the starter 3 is started when the vehicle restarts. Further, depending on the state of charge and the remaining capacity of the storage battery, which is the determination result of the storage battery charge state determination device 8, when the vehicle is stopped or temporarily stopped, it is determined whether or not to stop the engine, and these are If these are stopped when they can be stopped, and the engine is stopped while the vehicle is stopped or temporarily stopped, depending on the state of charge or the remaining capacity of the storage battery that is the determination result of the storage battery state of charge determination device 8, It is determined whether or not the starter is to be activated, and if necessary, the starter 3 is activated while the vehicle is stopped or temporarily stopped. The details of the idling stop processing means 7 are omitted in this specification.

As described above, when starting or restarting the engine, a large current flows from the storage battery 1 to the starter 3 to start the engine. During normal traveling of the vehicle, the electric power generated by the alternator (generator) 2 charges the storage battery 1 via the bus 5 and is supplied to the electrical equipment load. During idling stop of the vehicle, the alternator 2 stops generating power by stopping the engine, and the storage battery 1 supplies power to the electrical component load 4.

The charge / discharge current of the storage battery 1 is detected by the current detector 6 provided so as to detect the current flowing through the storage battery 1 connected to the bus 5. The current signal detected by the current detector 6 is input to the storage battery charge state determination device 8.
Further, an activation timing signal for restarting the engine is input to the storage battery charge state determination device 8. The storage battery charge state determination device 8 determines the charge state of the storage battery 1, and the determination result is input to the idling stop processing means 7. The idling stop processing means 7 stops the engine according to the result of the determination of the charge state of the storage battery 1 by the storage battery charge state determination device 8. Whether the starter is started or not depending on the state of charge or the remaining capacity of the storage battery which is the determination result of the storage battery state of charge determination device 8 when the engine is stopped while the vehicle is stopped or temporarily stopped. If necessary, starter 3 while the vehicle is stopped or temporarily stopped
Output the signal to activate. As a result, the engine starts.

The current detection signal input from the current detector 6 to the storage battery charge state determination device 8 is integrated in the storage battery charge state determination device 8 at any time, and the current is detected by inputting a start timing signal for engine restart. The integrated value is reset. Therefore, the storage battery charge state determination device 8 calculates the balance amount of the charging / discharging current from the engine start or restart to the next engine start. A threshold value is set in advance for the balance amount of the charging / discharging current in the storage battery charge state determination device 8, and when the balance amount of the charging / discharging current of the storage battery 1 is below the threshold value, the determination result is It is input to the idling stop processing means 7. The idling stop processing means 7 outputs a signal for activating the starter 3 when a signal that the balance amount of the charging / discharging current of the storage battery 1 is determined to be below the first threshold value is input, Start the engine. Alternatively, the engine may be restarted, the electrical load 4 may be disconnected from the storage battery 1, or the storage battery 1 may be disconnected.
The power supply from the power supply will be suppressed or a display will be displayed to call attention to them.

Experimental Example As an experimental example (example) of the present invention, a vehicle having an idling stop function as illustrated in FIG. 2 was used to perform a test for simulating a running pattern at night. With the nighttime driving pattern used in the test, idling stop running was carried out by repeating engine start, vehicle running, idling stop, and engine restart. The running time was set to about 60 seconds and the idling stop time was set to about 60 seconds.

First, the waveform of the charging / discharging current flowing through the storage battery 1 was measured when these idling stop runs were performed without applying the storage battery charge state determination device 8. The waveform is shown in FIG. In FIG. 3, (+) is shown when the storage battery 1 is charged, and (-) is shown when the storage battery 1 is discharged.

From the diagram of FIG. 3, when the engine is started, a large discharge current temporarily flows from the storage battery 1 to the starter 3,
At the same time when the engine starts, the alternator 2 normally shifts to charging the storage battery 1, and the current waveform continues to show + because the alternator 2 charges the storage battery 1 even while the vehicle is running. During idling stop, the storage battery 1 is discharged, and the current waveform shows 1.
It takes about 1 second to start the engine, and the maximum discharge current is about 840A. About 10-2 during the first 10 seconds while driving
The battery is charged at 0 A and 0 to 10 A for the next 50 seconds, and discharged at 10 A during idling stop.

FIG. 4 is a graph in which the charging / discharging current waveform in FIG. 3 is divided into the charging state and the discharging state to calculate the charging / discharging capacity (charging / discharging current balance amount) when the current is integrated. From the diagram in Fig. 4, 0.03 when the engine starts
The discharge is 7 Ah, the charge is 0.152 Ah during traveling, and the discharge is 0.18 Ah during idling stop. As described above, although the discharge current is 0.037 Ah due to the large current discharged at the time of starting the engine for a short time, the discharge capacity at the time of starting the engine is not negligible.

FIG. 5 is a graph showing the result of calculating the charge / discharge capacity from the engine start or restart to the next engine start. When one cycle of engine start, vehicle running, and idling stop is performed once, the discharge is about 0.065 Ah.

Next, the waveform of the charging / discharging current flowing in the storage battery 1 was measured when the storage battery charge state determination device 8 was applied and the same idling stop running as described above was performed. The first threshold value in the balance amount of the charging / discharging current in the storage battery charge state determination device 8 was set to 0 Ah. The result of obtaining the charge / discharge capacity from the measured current waveform is shown in FIG. Further, FIG. 6 shows the result of determining whether the storage battery charge state determination device 8 has fallen below the first threshold value and outputting the starter start signal for restarting the engine.

From the diagram of FIG. 6, the charge / discharge capacity becomes 0 A at 40 seconds after the idling stop of the first cycle.
Below h, the starter start signal for engine restart is output. Therefore, the engine is restarted and the storage battery is charged when the vehicle is stopped. Then, when about 20 seconds passed, the vehicle started to run for the second cycle, and after running for about 60 seconds, the idling stop for the second cycle was performed. During the second idling stop, the charge / discharge capacity fell below 0 Ah at about 52 seconds.

Similarly, in the third and subsequent cycles, the charge / discharge capacity fell below 0 Ah when about 50 seconds had elapsed after idling stop. Thus, it was possible to confirm that the storage battery charge state determination device 8 determines that the battery capacity during idling stop running does not fall below the initial state of charge.

In an automobile having an idling stop function, the storage battery 1 during idling stop
The biggest concern is that the discharge of the vehicle will gradually decrease from the initial state of charge to a state of charge in which the engine cannot be restarted, and eventually the engine cannot be restarted, which is a dangerous condition for traffic safety. Is. However, by using the storage battery state-of-charge determination device 8 of the embodiment of the present invention, the state of charge below this state of charge can be set on the basis of the battery capacity at which the engine can be started without quantitatively obtaining the absolute value of the battery capacity. Since the state of charge is determined so that it will not occur, it is possible to reliably restart the engine after idling has stopped, and the determination accuracy (accuracy)
Is also high.

The above example was conducted by a test simulating a nighttime running pattern in which the discharge capacity during idling stop was relatively large. Storage battery 1 during idling stop
In the daytime running pattern in which the discharge capacity is smaller, the charge capacity often exceeds the discharge capacity, but the method of the present invention can be applied as it is.

In the idling stop running in the nighttime traffic where the discharge capacity during idling stop is larger than that of the simulation test this time, the idling stop time tends to be shortened, but the idling stop can be stopped without any problem. It is possible and practically applicable enough.

In order to further enhance the idling stop function for increasing the idling stop time during stop, the storage battery charge state determination device according to the embodiment of the present invention determines the battery capacity at which the engine can be started. As a reference, a known remaining capacity determination may be used at the timing when it is determined that the state of charge is lower than this state of charge. The determination timing at this time is that the discharge from the storage battery 1 was continued, and the change in the battery voltage of the storage battery 1 is stable. Therefore, at these determination timings, a known remaining capacity determination method is independently used by quantitatively determining the absolute value of the battery capacity by a known remaining capacity determination and determining whether or not it is within the lower limit capacity required for engine starting. It is possible to obtain a further effect as compared with the case of using.

[0057]

INDUSTRIAL APPLICABILITY According to the vehicle equipped with the storage battery of the present invention, the vehicle equipped with the storage battery and having the idling stop function, and the storage battery state determination device and method mounted on the vehicle having the idling stop function, the idling stop running Of the battery capacity of the storage battery by calculating the balance balance by cumulatively integrating the charge and discharge capacities of the storage battery from the engine start or engine restart in the middle to the next engine restart and comparing the balance balance with a preset threshold value. Since the state of charge is determined without quantitatively obtaining the absolute value, it is possible to reliably restart the engine after idling stop. Therefore, it is possible to reliably determine the engine restart after the idling stop without falling into a very dangerous situation in traffic safety such that the engine cannot be restarted after the idling stop and the engine is stuck at an intersection or the like.

Further, since the present invention is based on the battery capacity of the storage battery whose engine can be restarted in advance, the accuracy of the determination of the state of the storage battery is high. Moreover, in the present invention, since only the charging / discharging current of the storage battery is measured, the size can be reduced as compared with the conventional remaining capacity determination device. Also,
Since the present invention does not depend on the type and characteristics of the storage battery, there is no need to make corrections corresponding to differences in manufacturers and lots, and the present invention can be applied even if the user replaces the battery, and the performance of the storage battery deteriorates. Alternatively, even if the battery temperature changes, it can be applied without any problem.

Further, in the present invention, as the vehicle having the idling stop function, the exact same device according to the present invention can be applied to a large bus, a large truck, a hybrid vehicle, an ordinary car or a light vehicle having the idling stop function. Therefore, it is possible to make the device price very low by mass production, and the effect of the present invention is very great.

[Brief description of drawings]

FIG. 1 is a diagram showing a waveform example of a charging / discharging current of a storage battery mounted on a vehicle having an idling stop function of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a vehicle equipped with the storage battery of the present invention.

FIG. 3 is a waveform diagram of a charge / discharge current of a storage battery of a vehicle having an idling stop function as an embodiment of the present invention.

FIG. 4 is a graph showing the charge / discharge capacity of the charge / discharge current of the storage battery calculated for each charge / discharge period.

FIG. 5 is a graph showing a transition of charge / discharge capacity calculated by accumulating charge / discharge current of a storage battery.

FIG. 6 is a graph showing a charge / discharge capacity (remaining capacity) of a storage battery calculated by accumulating charge / discharge currents of the storage battery when the storage battery charge state determination device according to one embodiment of the present invention is applied. .

[Explanation of symbols]

..Vehicles with idling stop function 1 ... Storage battery, 2 ... Alternator 3 ... Starter, 4 ... Electrical load 5 ... Bus, 6 ... Current detector 7. Idling stop processing means 8 ... Storage battery charge state determination device 9 ... Engine ECU 10 ... Engine

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiyuki Sato             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Hideto Nakamura             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Tetsuya Kano             Fukushima Prefecture Iwaki City Joban Shimo-Funao Pile 23-6               Furukawa Battery Co., Ltd., Iwaki Plant F term (reference) 2G016 CA03 CB12 CB21 CB22 CB31                       CB32 CC01 CC02 CC03 CC04                       CC27                 3G092 AC02 AC03 EA08 EB03 GA01                       GA04 GA10 GB10 HF01Z                       HF02Z                 3G093 AA07 AA16 BA21 BA22 CA02                       DB19 DB20 DB26 DB28 EB09                 5G060 AA04 CB06                 5H030 AS08 BB10 FF42

Claims (16)

[Claims] 1. A rechargeable storage battery, an alternator connected to the storage battery, a starter connected to the storage battery, or a starter connected via an inverter, connected to the storage battery. An electrical load that is, a current detector that detects a charge / discharge current when charging / discharging between the storage battery and the alternator, the starter, and the electrical load, and the storage battery based on the detection result of the current detector. A vehicle having a storage battery charge state determination means for determining a state of charge, wherein the storage battery charge state determination means, the current detector in the period from the start or restart of the starter until the restart of the next starter It has means for integrating the detected charging / discharging current and means for determining the state of charge or the remaining capacity of the storage battery according to the integrated value. That, a vehicle equipped with a storage battery. 2. The state of charge of the storage battery or the state of charge of the storage battery is compared by comparing a preset threshold value of the integrated value of the charging / discharging current with a preset integrated value of the charging / discharging current. A vehicle equipped with the storage battery according to claim 1, which determines a capacity. 3. The threshold value of the integrated value of the charge / discharge current is 0 to
A vehicle equipped with the storage battery according to claim 2, which is in a range of +10 Ah. 4. When the vehicle is stopped or temporarily stopped, it is determined whether or not to stop the engine according to the state of charge or the remaining capacity of the storage battery, which is the determination result of the storage battery charge state determination means, and the vehicle is stopped. The vehicle equipped with the storage battery according to any one of claims 1 to 3, further comprising an idling stop processing means for stopping these when possible and activating the starter when the vehicle restarts. 5. When the vehicle is stopped or temporarily stopped, it is determined whether the engine is to be stopped or not depending on the state of charge or the remaining capacity of the storage battery, which is the determination result of the storage battery charge state determination means. If possible, stop these, when the vehicle is stopped or the engine is stopped during the temporary stop, depending on the state of charge or the remaining capacity of the storage battery which is the determination result of the storage battery state of charge determination means, A vehicle equipped with the storage battery according to any one of claims 1 to 4, further comprising idling stop processing means for deciding whether to start the starter and, if necessary, starting the engine while the vehicle is stopped or temporarily stopped. . 6. A chargeable / dischargeable storage battery, an alternator connected to the storage battery, a starter connected to the storage battery, an electrical load connected to the storage battery, the storage battery to the alternator, the A storage battery charge state determination device that determines a charge state or a remaining capacity of the storage battery of a vehicle equipped with a starter and a current detector that detects a charging / discharging current when the electrical load is charged / discharged. The storage battery charge state determination device integrates the charge / discharge current detected by the current detector in the period from the start or restart of the starter to the restart of the next starter,
A storage battery charge state determination device having means for resetting the integrated value at the next restart and integrating the charge / discharge current again, and means for determining the state of charge or the remaining capacity of the storage battery according to the integrated value. 7. The state of charge of the storage battery or the state of charge of the storage battery is determined by comparing a preset threshold value of an integrated value of charge / discharge current with a preset integrated value of the charge / discharge current. The storage battery charge state determination device according to claim 6, wherein the capacity is determined. 8. The threshold value of the integrated value of the charge / discharge current is 0 to
The storage battery charge state determination device according to claim 7, which is in a range of +10 Ah. 9. Whether to stop the engine of the vehicle when the vehicle is stopped or temporarily stopped according to the state of charge or the remaining capacity of the storage battery which is the determination result of the storage battery charge state determination device. The storage battery according to any one of claims 6 to 8, further comprising an idling stop processing means for stopping the starter and restarting the starter when the vehicle restarts. Charge state determination device. 10. Whether the engine is stopped when the vehicle is stopped or temporarily stopped according to the state of charge or the remaining capacity of the storage battery which is the determination result of the storage battery charge state determination device. When the vehicle is stopped or the engine is stopped while the vehicle is stopped or temporarily stopped, charging of the storage battery which is the determination result of the storage battery charge state determination device The idling stop processing means for deciding whether to start the starter according to the state or the remaining capacity and starting the engine when the vehicle is stopped or temporarily stopped is further mounted, if necessary. The storage battery charge state determination device according to any one of 6 to 8. 11. In a vehicle having an idling stop function for stopping the engine while the vehicle is temporarily stopped, the charging current or the discharging current of a storage battery mounted on the vehicle is measured, and then the engine is restarted or restarted. A storage battery installed in a vehicle having an idling stop function, which is characterized by calculating an integrated value of charge / discharge current until the engine restarts and determining the state of charge of the storage battery based on the calculated integrated value of charge / discharge current. How to determine the state of charge. 12. A vehicle having an idling stop function for stopping the engine while the vehicle is temporarily stopped while the vehicle is running, the charge current or the discharge current of a storage battery mounted on the vehicle is measured, and the next engine is started or restarted. The integrated value of the charge / discharge current of the storage battery in the period until restart is calculated, and the threshold value of the integrated value of the preset charge / discharge current and the integrated value of the charge / discharge current of the storage battery are comparatively evaluated to evaluate the storage battery. A method for determining a state of charge of a storage battery mounted on a vehicle having an idling stop function, which is characterized by determining a state of charge. 13. The method for determining the state of charge of a storage battery mounted on a vehicle having an idling stop function according to claim 12, wherein the predetermined threshold value is within a range of 0 to +10 Ah. 14. The engine can be restarted when an integrated value of charging / discharging current of the storage battery in a period from the engine start or restart to the next engine restart is larger than a preset threshold value. The method for determining the state of charge of a storage battery mounted on a vehicle having an idling stop function according to claim 12 or 13, characterized in that it is determined. 15. The state of charge of the storage battery decreases when an integrated value of charge / discharge currents of the storage battery in a period from the engine start or restart to the next engine restart is smaller than a preset threshold value. 15. The method for determining the state of charge of a storage battery mounted on a vehicle having an idling stop function according to claim 13 or 14, characterized by performing a process that does not. 16. The process for preventing the state of charge of the storage battery from decreasing includes restarting the engine, disconnecting an electrical load mounted on the vehicle from the storage battery, or suppressing power supply from the storage battery, or 16. The method for determining the state of charge of a storage battery mounted on a vehicle having an idling stop function according to claim 15, further comprising a display for calling attention.