JPH11102732A - Residual capacity measuring device of power battery for moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the remaining capacity of a power battery for a moving body continuously, in real time according to the voltage change of the battery. SOLUTION: A voltage-measuring part 1 for measuring the voltage of a power battery 2 for a moving body, a remaining capacity determining part 1 for determining the remaining capacity of the power battery 2 by using the voltage value measured with the voltage-measuring part 1, and a residual capacity meter 4 for displaying the residual capacity of the power battery 2 determined with the residual capacity determining part 1 are installed. The residual capacity determining part 1 has a voltage value accumulating means for accumulating the voltage values measured with the voltage-measuring part, a mean value calculating means for calculating a mean value from the accumulated voltage values, and a first determining means for determining the residual battery capacity cased on the mean value calculated with the mean value calculating means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the remaining amount of a battery, and more particularly to an apparatus for measuring the remaining amount of a battery for moving a vehicle. Examples of the moving object include an electric vehicle, an electric motorcycle, and an electric assist bicycle. The present invention mainly relates to a technique suitable for a remaining amount measuring device that displays a remaining amount in eight or more stages.

[0002]

2. Description of the Related Art Conventionally, in order to inform a driver of the remaining amount of a power battery of a moving body such as an electric vehicle, the correlation between the voltage of the power battery and the remaining amount of the battery is used. The needle of the power battery fuel gauge was swung accordingly.

[0003]

However, when the electric vehicle accelerates, the battery voltage sharply drops, so that the needle of the fuel gauge suddenly swings toward the empty side, and conversely, the battery voltage sharply increases during regeneration. As a result, the needle of the fuel gauge suddenly returns to the full side, which makes it difficult to know how much the remaining power battery power is.

[0004] In general, the battery voltage is high immediately after charging, and then gradually decreases with time to reach a constant value. Therefore, even when charging is insufficient, the voltage is high immediately after charging. Therefore, even if the travelable distance is short, the needle of the fuel gauge indicates the full state.

[0005]

An object of the present invention is to improve the disadvantages of the prior art, and more particularly, to an electric vehicle capable of displaying the remaining amount of a power battery of a moving body continuously and in real time in accordance with the characteristics of voltage change. It is an object of the present invention to provide a power battery remaining amount display device.

[0006]

Therefore, according to the present invention, there is provided a voltage measuring section for measuring the voltage of a mobile power battery, and the remaining power of the power battery is measured by using the voltage value measured by the voltage measuring section. And a fuel gauge for displaying the remaining power of the power battery determined by the remaining capacity determining unit. In addition, the remaining amount determining unit stores a plurality of voltage values measured by the voltage measuring unit, and an average value calculating unit that calculates an average value from the plurality of voltage values stored by the voltage value storing unit. And first determining means for determining the remaining battery level based on the average value calculated by the average value calculating means. This aims to achieve the above-mentioned object.

Here, the average value calculating means calculates an average value of the plurality of voltage values accumulated by the voltage value accumulating means, and the first judging means calculates the remaining battery level with reference to the average value. Therefore, even if there is an instantaneous voltage change during driving of the moving body, a stable voltage value that absorbs the instantaneous voltage change is calculated.

Further, according to the present invention, a voltage measuring section for measuring the voltage of the moving body power battery, and a remaining capacity determination for determining the remaining capacity of the power battery using the voltage value measured by the voltage measuring section. Unit, and a fuel gauge for displaying the remaining amount of the power battery determined by the remaining amount determining unit at the position of the needle, and the remaining amount determining unit is configured to perform the operation based on the voltage value measured by the voltage measuring unit. A target position calculating means for calculating a target hand position, and an actual position calculating means for calculating a needle driving amount from a relationship between the target hand position calculated by the target position calculating means and a current actual hand position, The configuration is adopted. This also
It is intended to achieve the above-mentioned object.

Here, the target position calculating means calculates the target hand position based on the voltage value, and the actual position calculating means does not immediately set the target hand position based on the voltage value as the actual hand position. In order to calculate the amount of needle drive from the relationship between the needle position and the target needle position, for example, when the battery is not charged but the battery level has apparently increased when the voltage has returned, Actually, processing such as setting the needle drive amount to “0” becomes possible.

[0010]

Next, an embodiment of the present invention will be described. The device for measuring the remaining amount of the driving battery according to the present embodiment includes:
A voltage measuring unit that measures the voltage of the moving body power battery, a remaining amount determining unit that determines a remaining amount of the power battery using the voltage value measured by the voltage measuring unit, and a remaining amount determining unit. And a fuel gauge for displaying the determined remaining power of the power battery. The remaining amount determination unit includes a voltage value storage unit that stores a plurality of voltage values measured by the voltage measurement unit, and an average value calculation unit that calculates an average value from the plurality of voltage values stored by the voltage value storage unit. And first determining means for determining the remaining battery level based on the average value calculated by the average value calculating means. By calculating the remaining battery level based on this average value, a stable display of the remaining battery level is performed.

[0011] In one embodiment, the remaining amount determination unit includes:
Immediately after the driving battery is charged or when the average voltage of the power battery falls below a predetermined first threshold value, the remaining battery level is determined based on the instantaneous voltage measured by the voltage measuring unit. It is preferable to provide a second determination unit that performs the determination. In other words, if the power is turned on immediately after the driving battery is charged, it is not possible to measure the voltage value for calculating the average value, so the maximum voltage value and the like that have reached during charging are taken into account. hand,
It is desirable to measure the remaining battery level from the current instantaneous voltage value. Further, when the average value falls below a first threshold value (Vmin) slightly higher than the discharge end voltage for stopping the electric vehicle, the instantaneous voltage is preferably used to sequentially display the voltage values.

Further, in a configuration in which the fuel gauge is provided with a hand for indicating the remaining capacity, or in a configuration in which the digital display is performed in eight or more stages or when the full charge is set to 100%, the remaining capacity determining unit includes a voltage measuring unit. A target needle position calculating means for calculating a target needle position based on the voltage value measured in step (a), and a needle driving amount is calculated from a relationship between the target needle position calculated by the target position calculating means and the current actual needle position. It is preferable to include an actual position calculating unit. If the target needle position at the voltage value is immediately set to the actual needle position, for example, when the voltage is restored, the remaining amount is displayed as increasing without charging, but by providing this actual position calculating means, In addition, it is possible to perform stable and reliable remaining amount display in consideration of voltage characteristics.

The actual position calculating means has a drive speed adjusting function for adjusting the speed at which the needle is driven from the actual needle position to the target needle position in accordance with the difference between the target needle position and the actual needle position. Good. This is a process of, for example, driving the hand at a high speed when the target hand position is far from the actual hand position, thereby making it easier to see the hand of the fuel gauge.

In many cases, the voltage is higher than usual immediately after charging the battery. Then, when the remaining amount is measured with this higher voltage value, the remaining amount that is larger than the actual remaining amount is displayed. Then, it may be assumed that the user may mistakenly think that the battery is completely charged by displaying the remaining amount larger than the actual remaining amount, even though the charging is incomplete. Therefore, in the case immediately after charging, the remaining battery level may be determined by referring to the voltage value during charging.

[0015] The voltage measuring section may include:
Charging time voltage storage means for storing whether or not a plurality of threshold values corresponding to the remaining battery amount which increases during predetermined charging during charging are provided; A post-charging needle position calculating function for calculating a target needle position based on a remaining amount determined to be charged during charging according to information stored in the means and a current voltage value measured by a voltage measuring unit. Good. As a result, the remaining battery level due to charging can be specified for each current value, and if necessary, the user can be properly notified of insufficient charging.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an electric vehicle driving battery remaining amount measurement device according to the present embodiment includes a controller 1 that determines a remaining amount of a power battery based on a voltage value of a power battery 2,
The fuel cell system further includes a fuel gauge 4 for displaying the remaining amount of the power battery determined by the controller. A V / F converter for converting the voltage value of the power battery into a pulse is connected between the power battery 2 and the controller 1. The controller 1 operates as a voltage measuring unit and a remaining amount determining unit.

The controller 1 includes a port 6 for connecting the V / F converter 3 and a power supply for control or backup, a port 7 for connecting the fuel gauge 4, and storage means such as a ROM (not shown). A CPU 8 that reads out a program and executes various controls, a RAM 9 serving as a main storage device of the CPU, a timer 10, and a D / D that converts the digital remaining amount of the driving battery 2 calculated by the CPU 8 into an analog voltage. A converter 11 is provided.

The power for driving the controller 1 is supplied from the auxiliary battery 5. When the key switch 12 provided between the auxiliary battery 5 and the controller 1 is turned on,
Control power is supplied from the auxiliary battery 5 to the controller 1. In addition to the key switch 12, a backup power supply is always supplied to back up control parameters stored in the RAM 9 or the like, for example, the last remaining battery level.

The fuel gauge 4 may be configured to display the remaining value as a digital value, but in the present embodiment, the remaining is determined by the swing of the needle with Full being the right side and Empty being the left side. Is displayed. Therefore, C
PU1 supplies an analog voltage for driving the needle of the fuel gauge through port 7.

The CPU 8 implements the following functions in accordance with the driving battery remaining amount measurement program. First, as a function for stabilizing the hand deflection, the average value of the battery voltage of the power battery is calculated, and based on this average value, the hand of the fuel gauge 4 is swung to the Empty side. Also, as a function for further improving the reliability of the remaining amount display, first, once the Empty
The needle swung to the side may not return to the full side. As a result, even when the time average voltage of the power battery increases due to a long stop or regeneration, no indication that the remaining amount has increased is displayed. Second, when the key switch 12 is turned off and then turned on again, the key switch 12 is turned off unless the battery is forcibly charged or the power battery or the auxiliary battery is replaced while the key switch 12 is turned off. Display the same remaining amount as the hour. When the auxiliary battery is replaced, the backed up memory is lost. Therefore, when the key switch 12 is turned on, the remaining amount is measured again. Then, in the present embodiment, the CPU 8 displays an appropriate remaining amount according to the relationship with the discharge end voltage and the charging method.

A pulse whose frequency indicates the voltage of the power battery is input from the V / F converter 3 to the controller 1. Then, the timers 10 are used to measure the fixed times T1 and T2. The fixed time T1 is, for example, 0.5
Seconds, and T2 is, for example, 50 seconds. The number of pulses input within a certain time T1 is converted into a voltage, which is used as the instantaneous voltage of the power battery. Further, the number of pulses input within a certain time T2 is converted into a voltage, which is set as a time average voltage. This allows
The controller 1 functions as a voltage measurement unit.

Further, the controller 1 stores whether or not the instantaneous voltage of the power battery has become equal to or more than Vchrg1 or Vchrg2, which is a threshold value corresponding to the current value during charging, during charging. Also, it stores whether or not the key switch 12 has been turned on after charging. Further, it stores whether or not the instantaneous voltage of the power battery has fallen below Vmin after charging. These pieces of information are stored in, for example, the RAM 9 and are retained even after the key switch 12 is turned off by the backup power supply.

Further, the controller 1 calculates a digital value representing a target needle position of the fuel gauge in, for example, 256 steps. In this case, based on the instantaneous voltage or the average voltage of the battery voltage, the target value of the remaining battery level may be determined using a predetermined map from the relationship between the motor current value and the temperature at that time. Thereby, the controller 1 functions as a remaining amount determination unit.

The controller 1 stores a digital value representing the current actual needle position of the fuel gauge, and refers to the current actual needle position and the target needle position to determine the fuel gauge. The next hand position is calculated. At this time, the next hand position is stored as the current hand position. Then, the digital value representing the needle position is converted into an analog voltage, and this analog voltage is output to the fuel gauge 4 to drive the actual needle.

FIG. 2 is a flowchart showing an example of the fuel gauge driving process. As shown in FIG. 2, first, the instantaneous voltage value of the power battery 2 is measured (S1). The CPU 8 stores the instantaneous voltage value in the RAM 9. Next, the timer 10
With reference to the output, it is confirmed whether or not a predetermined time has elapsed (S2). When a certain period of time has elapsed, since a plurality of instantaneous voltage values are stored in the RAM 9, the time average voltage value of the power battery 2 is calculated (S9).
3). Next, the target needle position is calculated using the average voltage or the instantaneous voltage (S4). FIG. 3 shows an example of the calculation process of the target needle position. Next, based on the relationship between the target needle position and the previous needle position, for example, the actual needle position is changed under various conditions (S5). Details of step S5 are shown in FIG.

On the other hand, if the predetermined time has not elapsed in step S2, the target voltage is calculated when the target voltage should be calculated with the instantaneous voltage (S4), and the actual hands are driven (S5). However, when the target hand position is to be calculated by the average value, the target hand position is not actually calculated until a certain time has elapsed.

As shown in FIG. 3, in the process of calculating the target needle position, first, it is confirmed whether or not the movement of the needle is a Full → Empty process (S11). As shown in FIG. 4A, the Empty → Full process is a display of the remaining amount immediately after the key switch 12 is turned on, and as shown in FIG.
The ll → Empty process is a remaining amount display when the driving battery is gradually consumed during running or after a stop and the remaining amount is decreasing. Empt
If it is the y → Full process, it is checked whether the key switch 12 is turned on for the first time after charging (S12).

If the key switch 12 is turned on for the first time after charging, it is checked whether or not the reference voltage Vchrg1 has been reached during charging (S13). The highest voltage during charging is the reference voltage V
If it has not reached chrg1, the position of the hand before charging is set as the target hand position (S14). On the other hand, when the voltage reaches Vchrg1 during charging, it is subsequently confirmed whether or not the voltage has reached the reference voltage Vchrg2 (S15). If the reference voltage Vchrg1 has been reached but not the reference voltage Vchrg2, the needle position before charging and the center of Empty and Full
Is set as the target needle position (S16). Further, if the reference voltage Vchrg2 is exceeded, the target needle position is calculated based on the instantaneous voltage of the power battery measured in step S1 of FIG. 2 (S17).

It is preferable to provide two types of reference voltages Vchrg1 and Vchrg2 as shown in FIG. First reference voltage Vchrg1
Is set slightly higher than the convergence value of the battery voltage after full charge. If the highest voltage during charging has not reached this reference voltage Vchrg1, either charging has not actually taken place or has been charged by a small amount. Therefore, in step S14 shown in FIG. 3, the position of the hand before charging is set as the target hand position. Second reference voltage Vch
rg2 is a voltage at which the remaining amount of the battery can be secured at 70% to 90%. For example, in the case of a lead battery, Vchrg2 is set to a value slightly lower than 1.2 times the nominal voltage of the battery. Therefore, the fact that the maximum voltage during charging has reached this reference value Vchrg2 indicates that at least 70% of the battery remaining capacity at the time of full charge has been secured. In this case, in step S17 shown in FIG. 3, the remaining amount is determined using the current instantaneous voltage. On the other hand, if the maximum voltage during charging has not reached Vchrg2, either charging has not actually been performed, or charging has been performed but charging is still insufficient. The second reference voltage Vchrg2 may be a constant current-constant voltage charge or a constant current-constant shown in FIG. 5B in addition to the two-stage constant current shown in FIG.
The present invention is also applicable to the case where constant voltage-constant current charging is performed. In the case of two-stage constant current charging, the value of Vchrg2 is near the peak of the voltage at a low current.

When the maximum voltage during charging reaches Vchrg1 but does not reach Vchrg2, charging is not actually performed, or charging is performed but charging is still insufficient. Therefore, in step S16 of FIG.
Even if the instantaneous voltage after turning on the key switch is high, firstly, when the remaining battery level before charging is less than half, the target hand position is stopped at half the position, and secondly, the battery before charging is charged. When the remaining amount is half or more, the target hand position is set to be the same as the hand position before charging. Actually, charging is not performed when the electric vehicle and the charger are mechanically connected but are not charged due to, for example, forgetting to turn on the power of the charger.

When it is determined in step S12 of FIG. 3 that the first key switch 12 is not turned on after charging, the position of the hand immediately before the key switch 12 is turned off is set as the target hand position. Thus, it is possible to avoid a display in which the remaining battery capacity increases due to the return of the voltage even though the battery is not charged.

In the processing of steps S12 to S17, since it is necessary to drive the fuel gauge immediately after the key switch is turned on, there is no time for calculating the time average of the voltage. The fuel gauge is driven based on the instantaneous voltage at the time of the operation. However, the battery has a high voltage immediately after charging, and the voltage tends to decrease with time and to a constant value. That is, if the time from the end of charging to the time when the key switch 12 is turned on is short, the instantaneous voltage when the key switch is turned on increases. Then, when the remaining amount is calculated based on this instantaneous voltage, the displayed remaining amount becomes larger than the actual one. The difference between the actual remaining amount and the calculated remaining amount due to the higher voltage is:
It becomes more problematic when the remaining amount is small. For this reason, in this embodiment, the fuel gauge is driven based not only on the instantaneous voltage when the key switch 12 is turned on, but also on the maximum value of the voltage during charging.

The processing shown in steps S12 to S16 in FIG. 3 will be described again with reference to FIGS. FIG.
Is a display example when the maximum voltage value during charging is smaller than Vchrg1, and in this case, the actually charged amount is zero or close to zero. Therefore, in the display example of FIG. 6 corresponding to step S14 of FIG. 3, the target position 32 of the needle 31 is the same as the position 33 before the charge, regardless of whether the remaining amount before charging is less than half or more than half. The same position.

FIG. 7 shows a display example in the case where the maximum voltage value during charging is smaller than Vchrg2. In this case, the remaining battery charge after charging is still insufficient. Therefore, step S1 in FIG.
In the display example of FIG. 7 corresponding to No. 6, when the remaining amount before charging is less than half, the target position 32 is set to a half position.
When the remaining amount before charging is more than half, it is the same as the needle position 33 before charging.

When the maximum value of the battery being charged is equal to or higher than Vchrg2, the battery is almost fully charged, and the difference in remaining capacity /
Since the value of the remaining amount is small, the remaining amount is driven based on the instantaneous voltage when the key switch 12 is turned on.

Referring to FIG. 3 again, the movement of the needle becomes Full →
In the case of Empty, the instantaneous voltage of the power battery is the reference voltage Vm
It is checked whether or not the value has become in or less (S1
9). If the instantaneous voltage of the power battery falls below the reference voltage Vmin, there is a possibility that the voltage drops below the discharge end voltage for stopping the electric vehicle. Therefore, in the example shown in FIG. (S21).

On the other hand, if the reference voltage is not lower than Vmin, the target hand position is calculated from the map in accordance with the time average voltage of the power battery (S20). Therefore, the vertical movement at the instantaneous voltage can be absorbed, and the stable calculation of the target hand position can be performed. In this step S20, when the instantaneous voltage is not lower than the reference value, the target needle position is always calculated by the average voltage value. However, a plurality of target needle positions for calculating the average value in step S2 of the flowchart of FIG. If the fixed time for accumulating the instantaneous values has not elapsed, the target hand position is not calculated in step S20 in FIG. However, for example, when accumulating ten instantaneous values and calculating an average value, the method of calculating the average value of the ten most recent values every time the instantaneous value is measured is described in FIG.
In step S2, the target hand position is calculated even if the fixed time has not elapsed.

FIG. 8 is a graph showing an example in which the reference for determining the remaining amount is switched from the average value to the instantaneous value when the instantaneous voltage of the battery approaches the discharge end voltage. In order not to shorten the life of the battery, it is conceivable to perform control to stop the electric vehicle when the instantaneous voltage value of the battery falls below the discharge end voltage. However, when the fuel gauge is operated at the average voltage, as shown in FIG. 8, when the average voltage is high, but the instantaneous voltage suddenly drops, the electric vehicle stops operating before the fuel gauge indicates Empty. There is a danger that the display will be unnatural to the driver. For this reason, in the present embodiment, as shown by reference numeral 24 in FIG. 8, once the instantaneous voltage falls below the reference value Vmin, the subsequent calculation of the target value is performed using the instantaneous voltage.
Therefore, it is possible to display on the fuel gauge that the battery voltage is approaching the discharge end voltage.

FIG. 9 is a flowchart showing the details of the process of changing the actual needle position with reference to the target needle position (step S5 in FIG. 2). In the process shown in FIG. 9, it is determined whether or not the charging has been performed properly. Further, in consideration of the fact that the voltage becomes high immediately after the charging, the target needle position calculated from the voltage value is corrected and the actual Needle position. Specifically, first, it is confirmed whether or not the movement of the needle is a Full → Empty process (S31). If it is not a Full → Empty process, it is checked whether the target needle position is on the Full side from the current needle position, and if it is on the Full side, the needle is moved to the full side (S3).
3). On the other hand, if the target hand position is not on the Full side of the current hand position, the target hand position is
Side, or whether a certain time has elapsed since the key switch was turned on (S34). If the target hand position is on the Empty side of the current hand position, or if the certain time If the time has elapsed, the operation mode is changed from Full to Empty (S35). If the target hand position matches the current hand position, the operation mode is not changed.

If it is determined in step S31 that the movement of the hand is a Full → Empty process, it is determined whether the target hand position is on the Empty side of the current hand position (step S31). Step S36). If it is on the Empty side, gradually move the needle to the Empty side. At this time, when the target hand position is close to Empty, or when the difference between the target hand position and the current hand position is large, the speed of hand movement is increased. This is adjusted by an analog voltage output from the controller 1 to the fuel gauge 4. Next, the current needle position is stored (S38).

In step S36, when the target hand position is on the Full side of the current hand position,
As a temporary increase in the voltage value, the actual needle is kept at the current needle position, and the position is updated (S38). The current hand position is maintained by using the backup power supply even if the key switch is turned off.

The control of the current needle position is shown in FIGS.
This will be described again with reference to FIG. FIG. 10A shows the movement of the needle.
FIG. 10B shows a case where the movement of the needle is an Empty → Full process. In the figure, reference numeral 31 indicates the actual needle position (the position stored as the current needle position), and reference numeral 32 indicates the target needle position. FIG.
In step S31, it is determined which of the two modes shown in FIG. 10 is in progress. Empty → F
The ull process is a process of displaying the current remaining battery level based on the instantaneous voltage immediately after turning on the key switch.

FIG. 11 is an explanatory diagram showing a specific example corresponding to steps S32 to S35. FIG. 11A shows a case where the target needle position is on the Full side from the current position. The needle is swung to Full side (S3
3). FIG. 11B shows a case where the target position of the needle is the same as the current position. In this case, the current position is updated as it is in step S34 even if the fixed time has not elapsed. FIG. 11C shows a case where the target needle position is on the Empty side of the current position. In this case, the operation mode is changed from Full to Empty (S3).
5).

FIG. 12 is an explanatory diagram showing a specific example corresponding to steps S36 to S38. FIG. 12A shows a case where the target needle position is on the Empty side of the current needle position. At this time, the needle is swung to the Empty side (S3).
7). On the other hand, in the case where the needle position is the same as the previous position shown in FIG.
Side, the needle is not actually moved (S3
8).

As described above, according to the present embodiment, the remaining amount is calculated based on the time average of the power battery, except when it is better to use the instantaneous voltage. Needle instructions are easier to see. And once Empt
Since the needle swung to the y side does not return to the full side until charging is performed, the reliability of the needle indication is improved.
There are several speeds to move the needle from the side to the Empty side, so the needle indication is more accurate, and furthermore, the width of the needle swing is limited according to the maximum value of the battery voltage during charging,
The user can be notified of the lack of charge.

[0046]

Since the present invention is constructed and functions as described above, according to this, the average value calculating means calculates the average value of the plurality of voltage values accumulated by the voltage value accumulating means. Even if there is a momentary voltage change during driving of
By absorbing this, a stable voltage value can be calculated, and the first determination means calculates the battery remaining amount with reference to the average of the voltage values. It is possible to provide an unprecedented excellent device for measuring the remaining amount of a power battery of a moving body, which does not vibrate finely due to a large voltage change and can perform a stable display corresponding to the actual remaining amount. . Further, in the configuration in which the remaining amount is displayed by the hand, the target position calculating means calculates the target hand position based on the voltage value, and does not immediately set the target hand position based on the voltage value as the actual hand position. Since the position calculating means calculates the needle driving amount from the relationship between the current needle position and the target needle position, for example, when the battery has not been charged but the voltage has been restored, the battery remaining amount becomes apparently large. In the case where the needle has actually been driven, the actual driving amount of the needle is set to “0”. By doing so, it is possible to provide an unprecedented excellent remaining amount measuring device capable of preventing an inconvenient display that the remaining amount has increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of a fuel gauge driving process performed by the configuration illustrated in FIG. 1;

FIG. 3 is a flowchart showing details of a target needle position calculation process shown in FIG. 2;

4 is an explanatory diagram showing a relationship between an actual hand position and a target hand position according to the flowchart shown in FIG. 3, and FIG.
FIG. 4B is a diagram showing an empty (empty) → full (full) process, and FIG. 4B is a diagram showing a full → empty process.

5 is a waveform diagram showing two thresholds shown in FIG. 3, FIG. 5 (A) is a diagram showing a case of two-stage constant current charging, and FIG. 5 (B) is a constant current constant voltage charging; FIG.

FIG. 6 is an explanatory diagram illustrating an example of driving a needle when the maximum voltage value during charging is smaller than Vchrg1, and FIG. 6A is a diagram illustrating a case where the remaining amount before charging is less than half; FIG. 6B is a diagram showing a case where the remaining amount before charging is more than half.

FIG. 7 is an explanatory diagram showing an example of driving a needle when the maximum voltage value during charging is smaller than Vchrg2, and FIG. 7A is a diagram showing a case where the remaining amount before charging is less than half; FIG. 7B is a diagram showing a case where the remaining amount before charging is more than half.

FIG. 8 is a waveform diagram showing a relationship between a discharge end voltage and a first threshold (Vmin).

FIG. 9 is a flowchart illustrating an example of an actual needle position calculation process illustrated in FIG. 2;

FIGS. 10A and 10B are explanatory diagrams showing an example of changing the actual movement of the needle. FIG. 10A is a diagram showing an empty → full process, and FIG. 10B is a diagram showing a full → empty process. .

FIG. 11 is an explanatory diagram showing an example of actual needle movement;
FIG. 11A shows a case where the target hand position is on the full side of the current hand position, and FIG. 11B shows an example where the target hand position and the current hand position are the same. 11
(C) is a diagram showing an example of a case where the target hand position is on the empty side of the current hand position.

12A and 12B are explanatory diagrams illustrating another example of actual needle movement. FIG. 12A illustrates an example in which the target needle position is on the empty side of the current needle position, and FIG. Is a diagram showing an example when the target hand position is the same as the current hand position,
FIG. 12C is a diagram showing an example in which the target hand position is on the full side of the current hand position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Controller (voltage measurement part, remaining amount judgment part) 2 Battery for power 3 V / F converter 4 Fuel gauge 5 Auxiliary battery

Claims (5)

[Claims] A voltage measuring unit for measuring a voltage of the mobile power battery; a remaining amount determining unit for determining a remaining amount of the power battery using a voltage value measured by the voltage measuring unit; A remaining power meter that displays the remaining amount of the power battery determined by the remaining amount determining unit. Voltage value accumulating means for accumulating a plurality of measured voltage values, average value calculating means for calculating an average value from the plurality of voltage values accumulated by the voltage value accumulating means, and an average calculated by the average value calculating means A first determining means for determining the remaining battery level based on a value of the remaining battery level. 2. The method according to claim 1, wherein the remaining amount determination unit determines the voltage when the power battery is charged or when a voltage average value of the power battery becomes equal to or less than a predetermined first threshold value. The remaining amount measuring device according to claim 1, further comprising a second determining unit that determines the remaining amount of the battery based on the instantaneous voltage measured by the measuring unit. 3. A voltage measuring unit for measuring a voltage of a mobile power battery, a remaining amount determining unit for determining a remaining amount of the power battery using a voltage value measured by the voltage measuring unit, And a fuel gauge for displaying the remaining amount of the power battery determined by the remaining amount determining unit at the position of a needle. Target position calculating means for calculating a target needle position based on the voltage value measured by the voltage measuring unit,
And a real position calculating means for calculating a needle driving amount from a relationship between the target hand position calculated by the target position calculating means and the current actual hand position. measuring device. 4. A drive for adjusting the speed at which the actual position calculating means drives the needle from the actual needle position to the target needle position according to a difference between the target needle position and the actual needle position. 4. The vehicle according to claim 3, further comprising a speed adjusting function.
A battery remaining power measuring device according to the above. 5. The charge voltage storage means for storing whether or not a plurality of threshold values according to a remaining amount of a battery which increases at the time of predetermined charging has been exceeded during charging, wherein the voltage measuring unit includes: The target hand position calculating means is based on a remaining amount determined to be charged during the charging according to information stored in the charging voltage storage means and a current voltage value measured by the voltage measuring unit. 5. The apparatus according to claim 4, further comprising a post-charging needle position calculating function for calculating a target needle position.