JP2000012103A - Battery capacity meter control device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a control device for a battery capacity meter that can contribute to improving the accuracy of a battery capacity meter mounted on an electric vehicle. When a vehicle is running, a power capacity representing a dischargeable output of a battery and an integrated capacity at the time of charging / discharging the battery are obtained (S30).
For each D, a set rate s for correcting the integrated capacity according to the power capacity is stored in the internal ROM in advance, and the set rate s corresponding to the depth of discharge at the time of stopping traveling is stored in the internal ROM.
(S90), and then, based on the set rate s and the power capacity calculated in advance, the integrated capacity of the battery is corrected (S95). To calculate the remaining capacity of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery capacity control device for calculating the remaining capacity of a battery mounted on a vehicle and presenting the calculated remaining capacity to a battery capacity meter on a meter panel.

[0002]

2. Description of the Related Art Conventionally, in an electric vehicle, the remaining capacity of a battery as a power source has been presented to a battery capacity meter on a meter panel.

[0003] The remaining capacity of this battery is determined by the depth of discharge DOD (De-
The control device is controlled so that the power capacity and the integrated capacity are reset to DOD = 0% when fully charged, and reset to DOD = 100% when fully discharged.

[0004]

However, in general, when driving an electric vehicle, charging is performed while there is a running capacity before the remaining capacity indicated on the battery capacity meter becomes 0%. Was used as such.

[0005] For this reason, if the supplementary charging and the discharging by traveling are repeated within a range in which the reset processing performed at the time of full charge or full discharge is not performed, an error is accumulated in the integrated power value,
As a result, there is a problem that the value indicated by the battery capacity meter presented on the meter panel is shifted.

[0006] The present invention has been made in view of the above,
It is an object of the present invention to provide a battery capacity meter control device that can contribute to improving the accuracy of a battery capacity meter mounted on an electric vehicle.

[0007]

According to the first aspect of the present invention,
In order to solve the above-mentioned problem, a power capacity calculating means for calculating a first capacity from a relationship between a discharge power amount of a battery mounted on a vehicle and an output power of the battery, and integrating power charged and discharged by the battery. Integrated capacity calculating means for calculating the remaining capacity of the battery, and remaining capacity calculating means for calculating the remaining capacity of the battery based on the first and second capacities, and displaying the calculated remaining capacity on the display means. It is a gist of the present invention to have an integrated capacity correcting means for correcting the integrated capacity calculating means at the start of charging based on the remaining capacity of the battery calculated during running of the vehicle.

According to a second aspect of the present invention, in order to solve the above problem, the remaining capacity calculating means calculates a remaining capacity of the battery by weighting each of the first and second capacities with a predetermined weight, The gist is that weights of the first and second capacities are changed based on the size of the remaining capacity.

According to a third aspect of the present invention, in order to solve the above-mentioned problem, the integrated capacity calculating means sets a correction rate for correcting the second capacity according to the first capacity for each remaining capacity of the battery. A setting rate storage means for storing in advance, and a remaining capacity storage means for storing a remaining capacity of the battery calculated during traveling of the vehicle, and a latest remaining capacity of the battery stored in the remaining capacity storage means at the start of charging. The gist of the present invention is to read the capacity, read a correction rate corresponding to the read remaining capacity of the battery from the set rate storage means, and correct the integrated capacity calculation means according to the read compensation rate.

[0010]

According to the first aspect of the present invention, the first capacity is calculated from the relationship between the discharge power of the battery mounted on the vehicle and the output power of the battery, and the battery is charged and discharged. The power is integrated to calculate the second capacity. Next, the remaining capacity of the battery is calculated based on the first and second capacities, and the remaining capacity is displayed. At the start of charging based on the remaining capacity of the battery calculated while the vehicle is running, Calculates the remaining capacity of the battery based on the first capacity and the corrected second capacity by correcting the second capacity calculated by integrating the powers charged and discharged. The remaining capacity can be displayed, which can contribute to the improvement of the accuracy of the battery capacity meter.

According to the second aspect of the present invention, the first
And the second capacity is given a predetermined weight to calculate the remaining capacity of the battery, and the weights of the first and second capacities are changed based on the magnitude of the remaining capacity, so that the battery can be accurately changed. Based on the first and second capacities, the remaining capacity of the battery can be calculated and displayed, which can contribute to the improvement of the accuracy of the battery capacity meter.

According to the third aspect of the present invention, a correction factor for correcting the second capacity in accordance with the first capacity is stored in advance for each remaining capacity of the battery, and the correction rate is calculated during traveling of the vehicle. The remaining capacity of the used battery is stored. Here, at the start of charging, the latest remaining capacity of the battery stored is read, the correction rate corresponding to the read remaining capacity of the battery is read, and the power charged and discharged by the battery is integrated according to the read compensation rate. By correcting the calculated second capacity, the remaining capacity of the battery can be accurately calculated based on the first capacity and the corrected second capacity, and this accurate remaining capacity can be displayed. This can contribute to improving the accuracy of the battery capacity meter.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a control device 1 for a battery capacity meter according to an embodiment of the present invention.

As shown in FIG. 1, a motor 29 serving as a load is connected to the battery 3 via an inverter 27. The DC current from the battery 3 is converted by the inverter 27 into a desired three-phase AC current. The motor 29 is driven.

The voltage detector 5 converts the battery 3 to the inverter 2
7 is detected. Current detector 7
Is the DC current I supplied from the battery 3 to the inverter 27.
Is detected. Temperature detector 8 detects battery temperature T of battery 3.

The battery control unit 9 includes a CPU, a ROM, and a RAM.
(Memory unit), a timer, etc., based on the DC current I of the battery 3 detected by the current detector 7 and the DC voltage V across the battery 3 detected by the voltage detector 5, the output power of the battery 3 The remaining capacity is obtained by performing a calculation or Wh integration calculation, and the remaining capacity is output to the battery capacity meter 11 on the meter panel.

The charger 13 is, for example, a commercial power source A at the time of charging.
The power from C100V or AC200V is converted to DC and supplied to the battery 3 for charging. The vehicle speed sensor 15 is composed of a rotary encoder attached to wheels, and outputs a vehicle speed pulse signal to the motor control unit 25 and the battery control unit 9.

The motor control unit 25 generates a PWM signal according to a torque command value corresponding to an accelerator opening from the accelerator 21 or a shift position from the shift lever 23 as a driver's operation amount, and generates a PWM (pulse) signal. Width modulation) control. The inverter 27 has a plurality of switching elements inside, and the switching elements are connected to the motor control unit 2.
The DC current from the battery 3 is converted into a three-phase AC current by ON / OFF control in accordance with the PWM signal output from the control unit 5, and the output torque of the motor 29 is controlled by the drive control of the switching element. It can be performed.
A motor control unit 25 is connected to the inverter 27, and a switching element in the inverter 27 is ON / OFF controlled in accordance with a PWM signal from the motor control unit 25, and a desired three-phase AC current is supplied to the motor 25. Supplied.
Motor 29 drives the vehicle according to the three-phase alternating current supplied from inverter 27. The motor 29 and the like
In the present embodiment, it is considered as a simple load, and a detailed description is omitted.

Next, discharge characteristics of the battery 3 will be described with reference to FIGS.

Generally, the output power P of the battery 3 is as shown in FIG.
As shown in (a), the dischargeable output P of the battery 3 depends on the discharge depth DOD indicating the current discharge degree.

The output power P of the battery 3 is shown in FIG.
As shown in (b), for example, when the depth of discharge DOD is less than 50%, the internal resistance R is small and the difference between each depth of discharge DOD is small, so the reliability is low, and the depth of discharge DOD is 50%. % Or more, the internal resistance R is large and the difference for each depth of discharge DOD is large, so that the reliability is high.

On the other hand, the Wh integrated amount of the battery 3 is equal to the discharge depth D
If the OD is less than 50%, the integration error after reset is small, so the reliability is high. If the depth of discharge DOD is 50% or more, the integration error increases, and the reliability is low. Come.

Next, with reference to FIG. 3, the error of the calculated value of the discharge power of the battery will be qualitatively described. FIG. 3 (a)
FIG. 3B shows the case where the Wh integration method is used, and FIG. 3B shows the case where the power calculation method is used. In the figure, the vertical axis represents the discharge power calculation value (Wh calculation value), the horizontal axis represents the true value of the discharge power Wh, and a1 and a2 indicate error ranges.

In the Wh integration method shown in FIG. 3A, since the accumulation of current and voltage errors at the time of measuring the discharge power is a factor of the error, the error increases as the Wh operation value increases. In the example of the figure, when the Wh operation value is large (when the depth of discharge DOD is approximately 100%), the error is ± 8.
%. Usually, the calculation accuracy is required to be about ± 5%. Therefore, the required accuracy cannot be satisfied at a place where the depth of discharge DOD is deep, that is, at the end of discharge.

On the other hand, in the case of the power calculation method shown in FIG. 3B, the error increases when the calculated Wh value is small (the depth of discharge is small), and the error decreases as the calculated Wh value increases. In the example of the figure, the error is about ± 10% where the Wh calculation value is almost zero, and the depth of discharge D
It can be seen that the required accuracy is not satisfied at a place where the OD is shallow.

Next, referring to FIGS. 6 to 12, FIGS.
The operation of the battery capacity meter control device 1 will be described with reference to the flowchart shown in FIG. It should be noted that the control program shown in this flowchart is executed by the R provided in the battery control unit 9.
It is stored in the OM and is processed every predetermined sampling time by the timer.

First, in step S10, the battery control unit 9
Determines whether the vehicle speed pulse signal output from the vehicle speed sensor 15 is "0" and the vehicle has stopped. If the vehicle is not stopped but running, the process proceeds to step S20. On the other hand, when the vehicle is stopped, the process proceeds to step S50.

When the vehicle is running, in step S20, a subroutine S20 is executed to perform a remaining capacity calculation process.
Call 0. Referring to FIG. 5, each step of the subroutine S200 is processed.

First, in step S210, a change in the current of the running battery is detected, a discharge current I and a discharge voltage V are sampled, and stored in the internal RAM.

In step S220, the maximum output P of the battery is determined based on the sampled discharge current I and discharge voltage V.
Calculate max.

In the power calculation method, as shown in FIG. 6A, the IV characteristic is linearly regressed from a plurality of measured discharge currents I and discharge voltages V to calculate the IV characteristic and the discharge end voltage Vmin.
The maximum output Pmax of the battery at that time is calculated from the intersection with.

Therefore, when an error of ± ΔV occurs in the voltage V, an error ± ΔImax occurs in the current Imax obtained from the regression line, as shown in FIG. As an error in Pmax,

ΔP = Vmin × ΔImax (1) In FIG. 6 (a), the internal resistance R of the battery indicated by the straight line B1 is smaller than the internal resistance R of the battery indicated by the straight line B2, and the battery performance is better. ± △ Imax increases.
When the error ± ΔImax occurs, as shown in FIG.
An error ΔWh also occurs in the discharge power obtained from the Wh-P characteristic according to the error ΔP. Here, when comparing the region C1 with a shallow discharge depth DOD with the region C2 with a deep discharge depth, it can be seen that the error ΔWh is larger when the DOD is shallower.

The maximum output Pmax is a dischargeable power (power calculation value) of the vehicle, and is not synonymous with the maximum output P'max of the battery alone. That is,
The power of the battery is expressed by the following equation using the discharge current I and the discharge voltage V.

[0035]

[Number 2] P = IV = I (E- V) / R = - (V 2 -EV) / R = {- I (V-E / 2) 2 / R} + E 2 / 4R ... (2) However , E is the open circuit voltage of the battery, and R is the internal resistance of the battery.

Therefore, the maximum output of the battery alone is V = E /
2 is uniquely determined by P′max = E ² / 4R.

On the other hand, the operating voltage range of the battery in the vehicle is V =
E / 2 or more, and the maximum output P'max of the battery is not used. However, the lower limit value V of the working voltage of the vehicle
min is determined from the following factors: (a) the lower limit voltage of the working voltage range (discharge end voltage) in consideration of the battery life; and (b) the lower limit voltage of the working voltage range that can guarantee the performance and function of the vehicle-mounted unit. The power that reaches this voltage Vmin is the maximum output of the vehicle, Pmax = Imax × Vmin. Here, Imax is a current value at the time of Vmin.

Then, in step S230, a characteristic formula Wh (Pmax) for the power calculation value Pmax of the discharge power Wh is calculated according to the battery characteristics. Note that the discharge power amount W
When calculating h (Pmax), h (Pmax) is calculated by the following equation (3) in consideration of battery charging and regenerative charging.

[0039]

Wh (Pmax) = Wh (Pmax1) − (∫Id × Vec × φ) (3) That is, the charge amount is subtracted using the latest discharge power amount Wh (Pmaxl) before charging as a reference value. . In equation (3), the integral of the second term is the charging current integration, where Vec is the discharge power conversion voltage (a constant according to the depth of discharge), and φ is the charging / discharging efficiency (a constant according to the current). Note that the discharge power amount W during charging is
h (Pmax) is a provisional value.

In step S240, the minimum guaranteed power Pmin is calculated, and the full capacity Wh (Pm
in) is calculated.

The full capacity Wh (Pmin) is a value obtained by substituting the minimum guaranteed power Pmin into the expression Wh (P) representing the Wh-P characteristic shown in FIG.

In step S250, the capacity WhC of the remaining capacity meter when the EMPTY lamp is turned on is calculated by the following equation (4).
It is calculated as follows.

[0043]

WhC = Wh (Pmin)-△ Wh (4) Here, △ Wh is the amount of power guaranteed after EMPTY is turned on by △ Wh shown in FIGS. 7 and 8 even if the remaining capacity meter displays EMPTY. It is.

Then, in step S260, the constant IV
Are actually measured and integrated, and the discharge power amount WhR up to the present is integrated.

Then, in step S270, a new P
Every time max1 is obtained, the discharge power amount Wh (Pmaxl) up to the present is calculated by substituting it into the characteristic expression Wh (Pmax).

When calculating the amount of discharged electric power Wh (Pmax), it is calculated by the above equation (3) in consideration of the case of battery charging and regenerative charging. Further, the discharge power amount Wh (Pmax) at the time of charging is a provisional value, and is updated (reset) when the power calculation is obtained again after the discharge marriage.
Further, when the full charge condition is completed at the time of charging when the vehicle stops, Wh (Pmax) is set to 0 and the SOC is reset.

In step S280, the averaged discharge power amount WhE is calculated. The discharge power WhE is the discharge power WhR obtained by the Wh integration method.
And Wh (Pmax) calculated by the power calculation method, and is calculated by the following equation (5).

[0048]

WhE = WhR × M (DOD) + Wh (Pmax) × {1-M (DOD)} (5) where the weight M (DOD) is a function of the depth of discharge DOD, and Wh (Pmax) Is the discharge power amount up to the present calculated by the power calculation method. For example,

## EQU6 ## If M (DOD) = 1-DOD (6), the weight M is equal to the depth of discharge D as shown in FIG.
As OD becomes deeper, it decreases from 1 to zero, and FIG.
As shown in (b), the discharge power WhE is changed from WhR to Wh (Pma
x).

In FIG. 9B, the vertical axis represents the amount of discharge power, and the horizontal axis represents power P. FIG. 9 (c) is the same as FIG.
DOD and M (DO) when switching from the Wh integration method to the power calculation method at a predetermined depth of discharge DOD as shown in FIG.
D) shows the relationship.

Therefore, in the above-described remaining capacity estimation method, the amount of discharge power is calculated by using both the power calculation method and the Wh integration method.

As an example, as shown in FIG. 10, when the depth of discharge (DOD) is 50%, the system is switched from the Wh integration method to the power calculation method. That is, the depth of discharge (DOD) is 0
Up to 50% is calculated by the Wh integration method, and the depth of discharge (DO
D) is calculated by the power calculation method up to 50 to 100%. By switching the calculation method as shown in FIG.
The target of the error of the Wh operation value is set to ±
It can be suppressed to about 5%.

In FIG. 10, the depth of discharge (DOD) is 50%
Is switched from the Wh integration method to the power calculation method at the time of, but the respective weights when these two methods are used in combination are selected according to the error situation of each method. At this time, the following two factors can be considered as switching factors.

Then, in step S290, the remaining capacity of the battery is calculated by the following equation (7), and the subroutine returns to the main routine.

[0054]

(Residual capacity) = WhC-WhE (7) Note that the full charge ramp point / extinguishing of the residual capacity meter 11 is performed when the normal end condition of the normal charge control is satisfied (this is defined as Ura charge). Then, the discharge power amount is set to WhR = 0, and the delayed charging lamp is turned on. When WhR> the specified discharge power amount, the lamp is turned off. Here, the reason why WhR is used is that WhR uses the power calculation method in a state near full charge.
This is because (Pmax) has insufficient resolution.

Returning to FIG. 4, in step S30, the depth of discharge DOD is calculated and stored in the internal RAM.

The depth of discharge DOD of the battery is a value calculated according to a known calculation processing method. That is, battery 3
Is calculated based on the DC current I, the DC voltage V, and the discharge time t when the battery is discharging, and from the full charge capacity Efull determined by the battery temperature T,

DOD = {E / Efull (T)} × 100 (8)

In step S30, step S2
70, the discharge power amount Wh up to the present (Pmax
1) is defined as the power capacity, and the discharge power amount WhR up to the present time obtained in step S260 is defined as the integrated capacity and the internal RA
Store it in M.

Then, in step S40, the battery control section 9 outputs the remaining capacity calculated in step S290 to the battery capacity meter 11 provided on the panel meter and presents the remaining capacity, and then returns to step S10.

On the other hand, if the vehicle is stopped, step S5
In the case of 0, it is determined whether the charge start switch 14 is pressed and the SW signal is in the ON state in order to perform the supplementary charging of the battery 3 using the charger 13. When the SW signal is turned on, in step S60, the auxiliary charging of the battery 3 by the charger 13 is started.

Then, in step S70, the battery control section 9 uses the charger 13 to determine whether or not the battery 3 is in the fully discharged state immediately before the auxiliary charging of the battery 3 is started. Calculate the remaining capacity. Remaining capacity Z of battery 3
Is the full charge capacity F of the battery 3, the ratio X determined by the depth of discharge DOD, the power capacity P that can be output at present,
Based on the integrated power capacity D,

Z = F− {X · P + (100−X) · D} (9) Here, when Z = 0, the battery is in a fully discharged state.
Since the reliability of the power capacity P is high, the process proceeds to step S100. On the other hand, if Z ≠ 0, it is not in the fully discharged state, and the process proceeds to step S80.

Then, in step S80, the latest discharge depth DOD at the time when the vehicle is stopped, which is stored in the internal RAM (memory unit) of the battery control unit 9, is read and referred to, and the discharge depth DOD is calculated as shown in FIG. As shown in (1), for example, it is determined whether or not it is in the range of 50 ≦ DOD. If the depth of discharge DOD is outside this range, the process proceeds to step S100.

On the other hand, if the depth of discharge DOD is within this range, the process proceeds to step S90. In step S90,
The set rate s for correcting the integrated capacity in accordance with the depth of discharge DOD is referred from the internal ROM. The setting rate s is
It is assumed that the conversion table is stored in the internal ROM of the battery control unit 9 in advance.

As shown in FIG. 11, when the depth of discharge DOD is in the range of, for example, 50 to 70%, the setting ratio s is 0 ≦ s ≦ 1, and the depth of discharge DOD becomes, for example, 70% or more. S = 1.

Next, in step S95, the latest power capacity and integrated capacity stored in the internal RAM are read, and the integrated capacity of the battery is corrected based on the set rate s and the power capacity.

In this case, the corrected power integrated capacity D1 of the battery 3 is calculated based on the power capacity P0 before correction that can be currently output and the power integrated capacity D0 before correction.

D1 = (D0−P0) × s + P0 (10) The integrated capacity Z at that time is

Z = F− {XP + (100−X) × D1} (11)

As a result, the integrated capacity Z, the power capacity P, and the integrated power capacity D of the battery 3 are newly corrected, and the battery control unit 9
Is stored in the internal RAM.

In step S100, the battery control unit 9 determines the DC current I of the battery 3 detected by the current detector 7 and the DC voltage V across the battery 3 detected by the voltage detector 5.
, A power integration calculation of the battery 3 is performed and stored in the internal RAM. Then, the process proceeds to step S110, and it is determined whether or not the depth of discharge DOD becomes 0% and the charging is completed.
If the charging has not been completed, the process returns to step S100, and this process is repeated until the charging is completed.

Therefore, since the power integrated capacity D stored in the internal RAM of the battery control unit 9 uses a newly corrected value at the time of auxiliary charging, as shown in FIG. Accumulation is prevented. The error (a) shown in FIG. 5 is a graph showing a case where the error is accumulated for each supplementary charge as in the conventional example.

As described above, the battery control unit 9 obtains the depth of discharge DOD indicating the current degree of discharge from the output power P when the battery 3 is fully charged, and calculates the integrated capacity DOD according to the depth of discharge DOD. Setting rate s for correcting the
In the internal ROM. Here, when the vehicle stops and starts auxiliary charging, the set rate s corresponding to the calculated depth of discharge DOD is read, and the integrated capacity D of the battery is corrected based on the set rate s and the power capacity. Thus, the integrated capacity Z of the battery can be accurately newly calculated and output to the battery capacity meter 11 on the meter panel, which can contribute to the improvement of the accuracy of the battery capacity meter.

That is, as shown in FIG. 2B, for example, when the depth of discharge DOD is less than 50%, since the internal resistance is small, the reliability of the output power P of the battery 3 is low. On the other hand, since the reliability of the integrated amount of Wh of the battery 3 is high, the correction is made to use the integrated amount of Wh of the battery 3 in this region. On the other hand, the depth of discharge DOD is 50%
In the case described above, the output power P of the battery 3 is high in reliability because the internal resistance is low, but the reliability of the Wh integrated amount of the battery 3 is low. Is corrected so as to adopt the output power P.

In the above-described embodiment, the case where the control device of the battery capacity meter is applied to the electric vehicle has been described. However, the present invention is not limited to such an electric vehicle, and the present invention is not limited to such an electric vehicle. Can be similarly applied.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a control device for a battery capacity meter according to an embodiment of the present invention.

FIGS. 2A and 2B are a diagram illustrating a discharge characteristic of a battery and a diagram illustrating the reliability of a power capacity and an integrated power amount of the battery; FIGS.

3A and 3B are diagrams qualitatively showing an error in a discharge power calculation value, where FIG. 3A shows a case where a Wh integration method is used, and FIG. 3B shows a case where a power calculation method is used.

FIG. 4 is a flowchart for explaining the operation of the control device of the battery capacity meter.

FIG. 5 is a flowchart showing a subroutine for performing a remaining capacity calculation process of a battery.

6A and 6B are diagrams illustrating an error factor of the power calculation method, in which FIG. 6A is a diagram illustrating a linear regression line of an IV characteristic, and FIG.
Is a diagram illustrating the error ΔP, and FIG. 3C is a diagram illustrating the error ΔWh.

FIG. 7 is a diagram showing a discharge power amount with respect to a power characteristic.

FIG. 8: Discharge depth DOD and origin of residual capacity meter (EMPTY)
FIG.

9A and 9B are diagrams illustrating an averaging process, wherein FIG. 9A illustrates a relationship between a depth of discharge DOD and a weight M, FIG. 9B illustrates a qualitative change in WhE, and FIG. 9C illustrates a depth of discharge DOD. And weight M
Another example of the relationship is shown below.

FIG. 10 is a diagram for explaining a discharge power amount by using both a power calculation method and a Wh integration method.

FIG. 11 is a graph (map) showing a set rate s corresponding to a depth of discharge DOD.

12A and 12B are a graph showing a state in which accumulation of an error (b) is prevented and a graph showing a state in which an error (a) is accumulated for each auxiliary charge as in the conventional example.

[Explanation of symbols]

 3 Battery 5 Voltage Detector 7 Current Detector 9 Battery Control Unit 11 Battery Capacity Meter 13 Charger 15 Vehicle Speed Sensor

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2G016 CA03 CB12 CB13 CB21 CB22 CB23 CB31 CB32 CB33 CC01 CC04 CC06 CC14 CC27 CC28 CE08 5G003 AA01 AA07 BA01 CA05 CA11 CA20 DA04 DA15 EA05 FA06 GB06 GC05 5H030 AA04 AAFF FF08 FF08 BB06 CC01 CC16 DD03 FF05 HA02 HA05 HA06 HB01 HB09

Claims (3)

[Claims] 1. A power capacity calculating means for calculating a first capacity from a relationship between a discharge power amount of a battery mounted on a vehicle and an output power of the battery; Control means for calculating the remaining capacity of the battery based on the first and second capacities; and displaying the calculated remaining capacity on the display means. An apparatus for controlling a battery capacity meter, comprising an integrated capacity correcting means for correcting the integrated capacity calculating means at the start of charging based on the remaining capacity of the battery calculated while the vehicle is running. 2. The remaining capacity calculating means calculates a remaining capacity of a battery by weighting each of the first and second capacities with a predetermined weight, and assigns a weight of the first and second capacities to the remaining capacity. The control device for a battery capacity meter according to claim 1, wherein the control is changed based on the size of the battery capacity meter. 3. The vehicle according to claim 1, wherein said integrated capacity calculating means includes: a set rate storing means for storing in advance a correction rate for correcting the second capacity according to the first capacity for each remaining capacity of the battery; Remaining capacity storage means for storing the remaining capacity of the battery calculated therein, at the time of starting charging, reading the latest remaining capacity of the battery stored in the remaining capacity storage means, and corresponding to the read remaining capacity of the battery. Reading the correction rate from the set rate storage means,
3. The control device for a battery capacity meter according to claim 1, wherein the integrated capacity calculating means is corrected in accordance with the read-out compensation rate.