JP6465290B2 - Control device for electric vehicle - Google Patents

Description

  The present invention relates to a control device for an electric vehicle that promotes normal charging so that the battery capacity of the secondary battery can be estimated more accurately in an electric vehicle that runs on the power of the secondary battery.

  A battery mounted on an electric vehicle such as an electric vehicle or a plug-in hybrid vehicle is configured to be supplied with electric power by, for example, ordinary charging using a household power source or rapid charging using a dedicated power source. The battery capacity (SOC) of the battery is estimated by a control device mounted on the electric vehicle. When the battery capacity decreases, a display prompting charging is displayed in the combimeter. Looking at this display, the driver is performing normal charging or quick charging.

  Usually, in an electric vehicle, current and voltage are not stable during rapid charging, and thus an accurate battery capacity cannot be estimated. Therefore, the estimation of the battery capacity is not performed at the time of quick charge but is performed at the time of normal charge. As described above, since the battery capacity is not estimated at the time of rapid charging, the difference between the actual battery capacity and the estimated battery capacity becomes significant when the rapid charging is repeated.

  Therefore, when charging is required, it is preferable to select normal charging if possible. This is because the battery capacity is estimated by performing normal charging, and thus the deviation in battery capacity is eliminated.

  However, the driver is only informed that charging should be performed as described above, and the driver cannot know whether normal charging should be selected in order to eliminate the deviation in battery capacity. For this reason, depending on the driver, only rapid charging may be repeated, and there is a possibility that the deviation in battery capacity will not be resolved.

  In addition, a battery charging device that counts the number of times of rapid charging and prohibits rapid charging when a predetermined number of times is reached has been proposed (for example, see Patent Document 1). In such an apparatus, although rapid charging, which causes battery capacity deviation, is prohibited, there is no mechanism for prompting the driver to perform normal charging, and the battery capacity deviation is not eliminated.

JP 2001-218378 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a control device for an electric vehicle that can recommend normal charging in order to display an accurate battery capacity.

A first aspect of the present invention that solves the above-described problem is a control device for an electric vehicle that includes a battery that is charged by normal charging or quick charging that is charged with a current larger than that of normal charging, and information presentation means that presents information. Battery capacity estimating means for estimating the battery capacity of the battery when normal charging is performed, and a normal charging recommendation counter is incremented by one when quick charging is performed, and the battery capacity estimating means increments the battery by the battery capacity estimating means. When the battery capacity is estimated, counting means for decrementing the normal charging recommendation counter by one , and normal charging for prompting the information presentation means to perform normal charging when it is determined that the normal charging recommendation counter exceeds a predetermined value An electric vehicle control apparatus comprising: a determination unit that presents recommended information.

  In the first aspect, when the quick charge is repeated, the normal charge recommendation information for recommending the normal charge can be presented in order to display the accurate battery capacity.

A second aspect of the present invention is the control apparatus for an electric vehicle as described in the first embodiment, before Symbol battery, when variation occurs in the voltage of the plurality of battery cells of the battery, the variation is small the balancer circuit the battery cell is charged and discharged is provided such that, the counting means is in a predetermined condition which may have a voltage variation between the battery cells, the balancer skip indicating that balancer circuit is not driven The counter is incremented by one, and a balancer drive counter indicating that the balancer circuit is driven when normal charging is performed is incremented by one, and the determination means has a ratio of the balancer skip counter to the balancer drive counter. An electric vehicle characterized by causing the information presentation means to present the normal charging recommendation information when it is determined that a predetermined value has been exceeded The control apparatus.

  In the second aspect, when the balancer circuit is not driven a sufficient number of times, the voltage between the battery cells varies, and this is the reason why the accurate battery capacity cannot be displayed. Normal charging recommendation information that recommends charging can be presented.

  According to a third aspect of the present invention, in the control device for an electric vehicle described in the second aspect, the predetermined condition that may cause a voltage variation between the battery cells is a predetermined time or more after the ignition switch is turned off. In the control apparatus for an electric vehicle,

  In the third aspect, a predetermined time or more has elapsed since the ignition switch was turned off, and the balancer circuit is not driven a sufficient number of times, resulting in variations in the voltage between the battery cells. When the capacity cannot be displayed, the normal charging recommendation information for recommending the normal charging can be presented in order to display the accurate battery capacity.

  According to a fourth aspect of the present invention, in the control device for an electric vehicle described in the second aspect, the predetermined condition that may cause a voltage variation between the battery cells is less than a predetermined time after the ignition switch is turned off. And the electric current value of the battery is not more than a predetermined value.

  In the fourth aspect, when the current value of the battery is equal to or less than a predetermined value, the battery voltage / current is stable, and the battery capacity estimated by the battery capacity estimating means is highly accurate. However, when the balancer circuit is not driven enough times, the voltage between the battery cells varies, and it is not possible to display the exact battery capacity due to this, so normal charging is recommended to display the accurate battery capacity. Charging recommendation information can be presented.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus of the electric vehicle which can recommend normal charge in order to display an exact battery capacity is provided.

It is a figure which shows schematic structure of the control apparatus of an electric vehicle. It is a block diagram which shows schematic structure of the control apparatus of an electric vehicle. It is a figure which shows the processing flow of a control apparatus. It is a figure which shows the processing flow of a control apparatus.

Hereinafter, modes for carrying out the present invention will be described. In addition, description of embodiment is an illustration and this invention is not limited to the following description.
FIG. 1 is a diagram showing a schematic configuration of a control device for an electric vehicle, and FIG. 2 is a block diagram showing a schematic configuration of the control device for an electric vehicle.

  The electric vehicle 1 includes a battery 2 that is a secondary battery and a motor 3 that operates by supplying power from the battery 2. The motor 3 is connected to drive wheels (front wheels in this embodiment) 5 via a drive mechanism 4.

  The electric power stored in the battery 2 is converted from direct current to alternating current by an inverter (not shown) and flows into the motor 3, thereby driving the motor 3. Further, the regenerative power generated when the electric vehicle 1 is decelerated is converted from alternating current to direct current by the inverter, flows into the battery 2, and is charged into the battery 2. These controls are performed by the control device 10 that performs integrated control of the vehicle.

  Further, the battery 2 can be charged by an external power source corresponding to two methods of quick charging and normal charging. Rapid charging is a charging method performed by passing a large current through the battery 2 for the purpose of charging the battery 2 in a short time. The normal charging is a charging method that is performed by causing the battery 2 to pass a smaller current than the rapid charging.

  When charging, the user selects one of the charging methods and connects the external power source to the battery 2 to charge. The electric vehicle 1 is provided with a charging port (not shown) to which an external power source is connected, but the physical shape is not particularly limited. The charging port may be provided individually for each of the two systems, or may be provided in common for the two systems.

  In the present embodiment, although not particularly illustrated, the electric vehicle 1 is provided with a quick charging port for performing quick charging and a normal charging port for performing normal charging. The normal charging port is a connection port for connecting a household commercial power supply (AC 100V, 200V or the like), and is connected to the battery 2 via a DC-DC converter (not shown).

The quick charging port is a connection port to which an external power supply for quick charging is connected, and is connected to the battery 2 without going through a voltage converter or the like. The quick charge port is provided with a signal line terminal as well as a power line terminal. When the quick charging nozzle is connected to the quick charging port from the external power source for quick charging, the control device 10 and the control unit of the external power source for quick charging are connected via the signal line, and a request signal from the control device 10 Is sent to the controller of the external power supply. The external power supply supplies charging power to the battery 2 in accordance with a request signal from the control device 10.
The control device 10 can detect whether the quick charge or the normal charge is performed via the quick charge port or the normal charge port.

The battery 2 includes a plurality of battery cells connected in series and a balancer circuit 6. The balancer circuit 6 is a circuit that equalizes the voltage between the battery cells, and can suppress a substantial decrease in the charge capacity of the battery 2. That is, in the battery 2, while the charge / discharge cycle is repeated, the voltage between the battery cells is likely to vary due to a difference in temperature state or deterioration state between the battery cells. When the variation in the voltage between the battery cells in the battery 2 increases, the substantial charge capacity of the battery 2 decreases as a result. For this reason, the balancer circuit 6 which has the function to discharge from the battery cell whose voltage is higher than another battery cell is provided so that a voltage difference may not arise between each battery cell.
The balancer circuit 6 is driven in response to a command from the control device 10, and performs the above-described equalization of the voltage between the battery cells.

  In addition, the electric vehicle 1 is provided with a combimeter 7 as an example of an information presentation unit. The combimeter 7 includes a plurality of indicator lamps that indicate various information related to the electric vehicle 1. The indicator lamp is controlled by the control device 10 to display various states.

  The combimeter 7 is provided with an indicator lamp 8 on which a graphic indicating that normal charging is recommended is drawn. In the present embodiment, the indicator lamp 8 has a shape imitating a normal charging cable connected to a household power source.

  Note that the information presenting means is not limited to such a combination meter 7, but may be any device that can transmit various information related to the electric vehicle 1 to a driver or the like. For example, a display device such as a liquid crystal display that displays various types of information as images based on control by the control device 10 can be used as the information presentation means. Further, an acoustic device such as a speaker may be used as the information presenting means, and various types of information may be transmitted as sound or warning sound.

  The control device 10 mounted on the electric vehicle 1 is configured as, for example, an LSI device or an embedded electronic device in which a microprocessor, a ROM, a RAM, and the like are integrated, and is connected to a communication line of an in-vehicle network provided in the vehicle. On the in-vehicle network, various known electronic control devices such as a brake control device, a transmission control device, a vehicle stability control device, an air conditioning control device, and an electrical component control device are connected so as to communicate with each other.

  Such a control device 10 includes a count unit 11, a battery capacity estimation unit 12, and a determination unit 13. In the present embodiment, the count unit 11, the battery capacity estimation unit 12, and the determination unit 13 are implemented as functions of a program executed by the control device 10. Of course, it is not limited to such an aspect, The count part 11, the battery capacity estimation part 12, and the determination part 13 may be mounted as an electronic circuit (hardware).

  As will be described in detail later, the counting unit 11 detects that the battery 2 has been rapidly charged and counts the number of times, detects that the balancer circuit 6 has been driven and counts the number of times, or Count the number of times it was not driven.

  The battery capacity estimation unit 12 estimates the battery capacity of the battery 2. The battery capacity of the battery 2 can be estimated by a known method. For example, a map indicating the relationship between the battery voltage and the battery capacity is stored in the memory in advance and corresponds to the voltage acquired from the battery 2. The battery capacity can be estimated by reading the battery capacity from the map.

  Further, the battery capacity estimation unit 12 performs normal charging, when a predetermined time or more has passed since the ignition switch was turned off, or less than a predetermined time after the ignition switch was turned off, and the battery 2 is below a predetermined value. At some point, the battery capacity is estimated.

  The determination unit 13 determines display / non-display of the indicator lamp 8 for prompting normal charging based on various parameters counted by the counting unit 11.

  The various parameters include a normal charge recommendation counter that is increased each time the battery is rapidly charged and decreased each time the battery capacity is estimated. Other parameters include a balancer drive counter and a balancer skip counter that count that the balancer circuit 6 is driven or not driven.

First, the case where the normal charging recommendation counter is used will be described in detail.
The count unit 11 increments the normal charge recommendation counter by one when the battery 2 is rapidly charged. As described above, the control device 10 has a function of detecting that the battery 2 is rapidly charged. Therefore, the count unit 11 increments the normal charge recommendation counter by one when the control device 10 detects the quick charge. In addition, when the battery capacity is estimated by the battery capacity estimation unit 12, the count unit 11 decrements the normal charge recommendation counter by one.

  When the determination unit 13 determines that the normal charge recommendation counter exceeds a predetermined value, the determination unit 13 causes the combimeter 7 to present the indicator lamp 8 having a shape indicating that the normal charge is urged.

  The indicator lamp 8 having such a shape is an example of normal charging recommendation information, and is not limited to such an aspect. As the normal charging recommendation information, a character, a figure, a symbol, or a combination thereof that allows the user of the electric vehicle 1 to recognize that normal charging is recommended can be adopted. Further, the normal charging recommendation information is not limited to information that is visually recognized, such as characters, but may be information that is recognized by hearing, such as voice and warning sounds.

  The battery capacity estimation unit 12 estimates the battery capacity of the battery 2, but if rapid charging is repeated, the battery capacity estimation unit 12 does not perform estimation, and the difference between the estimated battery capacity and the actual battery capacity becomes significant. . Therefore, a value that causes a significant shift in battery capacity when the normal charge recommendation counter exceeds a predetermined value is set as the predetermined value. Such a predetermined value is obtained in advance by simulation or actual measurement, for example, and is stored in the memory of the control device 10.

  Then, the determination unit 13 reads and compares the predetermined value with the normal charging recommendation counter counted by the counting unit 11. When the determination unit 13 determines that the normal charge recommendation counter exceeds a predetermined value, it means that the battery capacity deviation starts to become significant. Therefore, the determination unit 13 causes the combimeter 7 to display the indicator lamp 8 that recommends normal charging.

  Conversely, if the battery capacity is estimated by the battery capacity estimating unit 12, it means that the battery capacity shift is eliminated. Therefore, the normal charge recommendation counter is decreased by the counting unit 11 in accordance with the estimation of the battery capacity, and the indicator lamp 8 is displayed when the determination unit 13 determines that the normal charge recommendation counter is equal to or less than the predetermined value. The indicator lamp 8 that has been displayed or not displayed is not displayed.

  If the user of the electric vehicle 1 performs normal charging according to the indicator lamp 8, the balancer circuit 6 equalizes the voltage as well as the battery 2 is charged. Since the battery capacity is estimated by the battery capacity estimator 12 during normal charging with the voltage variation between the battery cells eliminated in this way, the estimated value of the battery capacity is highly accurate.

  In the control device 10 of the present embodiment, when the determination unit 13 determines that the normal charge recommendation counter exceeds a predetermined value, the control for prohibiting the rapid charge is not performed. As a result, a quick charge option can be left for a user in an environment where normal charge cannot be performed. Of course, the control device 10 of the present invention can also control the charging of the battery 2 that prohibits rapid charging when the determination unit 13 determines that the recommended normal charging counter exceeds a predetermined value.

Next, the case where the indicator lamp 8 for prompting normal charging is displayed or hidden using the balancer drive counter and the balancer skip counter will be described.
The balancer drive counter is a counter that is incremented by one when the balancer circuit 6 provided in the battery 2 is driven. The balancer circuit 6 is performed when the battery 2 is normally charged. For this reason, the balancer drive counter is substantially equal to the number of times of normal charging.

  The balancer skip counter is a counter that is incremented by one when the battery capacity estimation unit 12 estimates the battery capacity under the condition that the voltage is likely to vary between the battery cells of the battery 2.

  Such conditions include (i) a predetermined time or more after the ignition switch is turned off, and (ii) less than a predetermined time after the ignition switch is turned off, and the battery current value is a predetermined value. There are two conditions:

  In the case of (i), since the predetermined time has passed since the ignition switch was turned off, the voltage / current of the battery 2 is stable, and the battery capacity estimated by the battery capacity estimation unit 12 is accurate. Is expensive. However, it is not the battery capacity estimated when the voltage variation between the battery cells is equalized by the balancer circuit 6 during normal charging. Therefore, there is a possibility that the estimation accuracy of the battery capacity is lowered due to the voltage variation between the battery cells.

  The predetermined value of (ii) refers to a value that stabilizes the voltage if the current value of the battery 2 is equal to or less than the predetermined value. When the current value of the battery 2 is equal to or less than the predetermined value, the voltage / current of the battery 2 is stable, and the battery capacity estimated by the battery capacity estimating unit 12 is highly accurate. However, it is not the battery capacity estimated when the voltage variation between the battery cells is equalized by the balancer circuit 6 during normal charging. Therefore, there is a possibility that the estimation accuracy of the battery capacity is lowered due to the voltage variation between the battery cells.

  As the balancer drive counter described above increases, there is a high possibility that the variation in voltage between the battery cells of the battery 2 by the balancer circuit 6 is eliminated, and the accuracy of the estimated battery capacity is also high. On the other hand, the more balancer skip counters, the higher the possibility that the voltage between the battery cells of the battery 2 varies, and the estimated battery capacity is less accurate.

  If such a balancer drive counter is sufficiently larger than the balancer skip counter, it can be determined that there is no voltage variation between the battery cells of the battery 2 and the battery capacity estimation accuracy is high. On the contrary, if the balancer skip counter is sufficiently larger than the balancer drive counter, it can be determined that there is a variation in voltage between the battery cells of the battery 2 and the battery capacity estimation accuracy is low.

Based on such a principle, the count unit 11 and the determination unit 13 function as follows.
As described in (i), the count unit 11 decrements the normal charge recommendation counter by one when the battery capacity is estimated after a predetermined time or more has elapsed after the ignition switch is turned off, and sets the balancer skip counter to 1. Increase one more.

  In addition, as described in (ii), the count unit 11 sets the normal charge recommendation counter when the ignition switch is turned off and less than a predetermined time and when the battery capacity of the battery 2 is equal to or less than a predetermined value. Decrease by 1 and increase the balancer skip counter by 1.

That is, the count unit 11 reduces the normal charge recommendation counter because the battery capacity estimation accuracy tends to increase when the battery capacity is estimated under both conditions (i) and (ii). However, since there may be a variation in voltage between battery cells, the count unit 11 increases the balancer skip counter by one.
Further, the count unit 11 increments the balancer drive counter by one when the battery 2 is normally charged.

  When the determination unit 13 determines that the ratio (M / N) of the balancer skip counter (M) to the balancer drive counter (N) exceeds a predetermined value, the determination unit 13 indicates that the combination meter 7 is urged to perform normal charging. The shape indicator lamp 8 is presented. If the ratio exceeds a predetermined value, the balancer skip counter is sufficiently larger than the balancer drive counter, and voltage variation occurs between the battery cells of the battery 2 and it is determined that the estimation accuracy of the battery capacity is low. it can.

  If the user of the electric vehicle 1 performs normal charging according to the indicator lamp 8, the balancer circuit 6 equalizes the voltage as well as the battery 2 is charged. Since the battery capacity is estimated by the battery capacity estimator 12 during normal charging with the voltage variation between the battery cells eliminated in this way, the estimated value of the battery capacity is highly accurate.

  Here, the processing flow of the control device 10 will be described with reference to FIGS. 3 and 4. 3 and 4 are diagrams illustrating a processing flow of the control device.

First, the control device 10 determines whether the ignition switch (IG) is on (ON) (step S1). If the ignition switch is off (step S1; No), it is determined whether the charge that is currently being performed or the most recently completed charge is a normal charge (step S2). If it is not normal charging (step S2; No), that is, if it is quick charging, the normal charging recommendation counter is incremented by one (step S3). Next, an elapsed time is set (step S4). The elapsed time means the time from when the ignition switch is turned off. As described above, since the ignition switch is off (turned off from on) in step S1, the elapsed time measurement (counting start) is started.
Thus, after the normal charge recommendation counter is incremented and the elapsed time is measured, the process returns to the start.

Here, it is assumed that the ignition switch is turned on by the user of the electric vehicle 1. Then, the control device determines that the ignition switch is on (step S1; Yes), and then determines whether the elapsed time is a predetermined time, here, less than one hour (step S5). Here, it is assumed that the elapsed time is less than 1 hour (step S5; Yes). Next, it is determined whether the normal charging recommendation counter is a predetermined number of times, here, less than 5 (step S6). If the above-described steps S1 to S2 to S3 to S4, that is, the quick charge is performed five times or more with the ignition switch turned off (step S6; No), the indicator lamp 8 for prompting the normal charge is turned on (step S7) Return to start.
That is, as a result of repeating the quick charge, when the normal charge recommendation counter reaches a predetermined number of times, the indicator lamp 8 that prompts the normal charge is turned on.

  When the ignition switch is turned off (Step S1; No) and normal charging is performed (Step S2; Yes), the battery capacity (SOC) is estimated (Step S8; Yes), and normal charging is performed. The prompt indicator lamp 8 is turned off (step S9), the number of times the balancer is driven, which is the number of times the balancer circuit 6 is driven along with the normal charge, is counted (step S10), and the normal charge recommendation counter is reset (S11).

  In other words, since the battery capacity is estimated with sufficiently high accuracy by performing normal charging, the indicator lamp 8 for prompting normal charging is not displayed and the normal charging recommended counter is reset.

  Next, using the balancer drive counter and the balancer skip counter, a processing flow related to the above-mentioned condition (i) “after a predetermined time has elapsed since the ignition switch was turned off” will be described. First, when the ignition switch is off (step S1; No), normal charging is performed (step S2; Yes), and when the battery capacity is not estimated (step S8; No), the measurement of elapsed time starts. (Step S4). Alternatively, when the ignition switch is off (step S1; No), if rapid charging is performed (step S2; No), measurement of elapsed time is started (step S4).

  Then, returning to the start, when the ignition switch is turned on next (step S1; Yes), it is determined whether or not the elapsed time has passed one hour or more (step S5). The elapsed time is measured when the ignition switch is turned off. Then, when it is switched from off to on, the elapsed time that was off is determined. If the elapsed time is one hour or more (step S5; No, conditions (i)), the battery capacity is estimated (step S12). Since the estimation of the battery capacity has been performed, it can be said that the estimation accuracy of the battery capacity tends to increase, so the normal charge recommendation counter is decreased by one (step S13). Next, the balancer skip counter is incremented by one (step S14).

Next, it is determined whether the ratio of the balancer skip counter to the number of times of balancer driving is less than 10 (step S15). When it is determined that the number of balancer skips is 10 or more, that is, the number of times of balancer skip is sufficiently larger than that of the balancer drive counter (step S15; No), it is considered that the estimation accuracy of the battery capacity is low due to the voltage variation between the battery cells. Therefore, the indicator lamp 8 for prompting normal charging is turned on (step S16). If it can be determined that the number of balancer skips is sufficiently smaller than the balancer drive counter (step S15; Yes), the elapsed time is reset (step S17) and the process returns to the start.
The numerical value to be compared with the ratio of the balancer skip counter with respect to the number of times the balancer is driven is not limited to 10. A numerical value that determines that the number of balancer skips is sufficiently larger than the balancer drive counter may be arbitrarily determined.

  That is, since the ignition switch is off for a sufficiently long time (1 hour or longer, step S5; No), the battery capacity is estimated, but the balancer circuit 6 is not driven sufficiently. In addition, in a situation where the estimation accuracy of the battery capacity is not sufficiently high, the indicator lamp 8 can be turned on to prompt the user to perform normal charging.

  Next, using the balancer driving counter and the balancer skip counter, the processing related to the above-mentioned condition (ii) “It is less than a predetermined time since the ignition switch is turned off and the battery current value is equal to or less than the predetermined value”. The flow will be described. First, when the ignition switch is off (step S1; No), normal charging is performed (step S2; Yes), and when the battery capacity is not estimated (step S8; No), the measurement of elapsed time starts. (Step S4). Alternatively, when the ignition switch is off (step S1; No), if rapid charging is performed (step S2; No), measurement of elapsed time is started (step S4).

  Then, returning to the start, when the ignition switch is turned on next (step S1; Yes), it is determined whether or not the elapsed time has passed one hour or more (step S5). If the elapsed time is less than 1 hour (Step S5; condition of Yes, (ii)), it is determined whether the normal charge recommendation counter is less than 5 times (Step S6). If the normal charging recommendation counter is 5 times or more, the indicator lamp 8 is turned on as described above (step S7).

  If the normal charge recommendation counter is less than 5 times (step S6; Yes), the normal charge indicator is turned off or kept off (step S18). Next, the current in the battery 2 is measured (step S19). Determination is made based on whether or not the current value of the battery 2 is equal to or less than a predetermined value (step S20). If the current value of the battery 2 is not less than the predetermined value (step S20; No), the process is returned to the start.

  On the other hand, when the current value of the battery 2 exceeds the predetermined value (step S20; Yes), the battery capacity is estimated (step S12). Since the estimation of the battery capacity has been performed, it can be said that the estimation accuracy of the battery capacity tends to increase, so the normal charge recommendation counter is decreased by one (step S13). Next, the balancer skip counter is incremented by one (step S14). Thereafter, as described in the condition (i), the processes of steps S15 to S17 are executed.

  That is, the battery capacity is estimated for the battery 2 whose ignition switch is off for a short time and the current value is equal to or less than the predetermined value, but the balancer circuit 6 is not sufficiently driven. In a situation where the capacity estimation accuracy is not sufficiently high, the indicator lamp 8 can be turned on to prompt the user to perform normal charging.

  As described above, according to the control device 10 according to the present embodiment, the conditions under which the estimation accuracy of the battery capacity is lowered, specifically, when the quick charge is repeated, or the balancer circuit 6 is operated a sufficient number of times. In the case where the battery is not driven, an indicator lamp 8 (normal charging recommendation information) for recommending normal charging can be presented in order to display an accurate battery capacity.

  If the user of the electric vehicle 1 performs normal charging according to the indicator lamp 8, the balancer circuit 6 equalizes the voltage as well as the battery 2 is charged. Since the battery capacity estimation unit 12 estimates the battery capacity during normal charging in a state where the voltage variation between the battery cells of the battery 2 is eliminated in this way, the estimated value of the battery capacity is highly accurate. .

  As mentioned above, although one embodiment of the present invention has been described, of course, the present invention is not limited to the above-described embodiment, and addition, omission, replacement, etc., of a configuration is possible without departing from the spirit of the present invention. And other changes are possible. For example, in the control device 10 according to the above-described embodiment, the normal charge recommendation counter, the balancer drive counter, and the balancer skip counter are used in combination, but each may be used alone.

  The present invention can be used in the industrial field of automobiles.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Battery 6 Balancer circuit 7 Combimeter (information presentation means)
8 Indicator light (Normal charging recommended information)
10 Control device 11 Count unit (counting means)
12 Battery capacity estimation unit (battery capacity estimation means)
13 Determination part (determination means)

Claims (4)

A control device for an electric vehicle comprising a battery charged by normal charging or rapid charging for charging with a current larger than normal charging and an information presenting means for presenting information,
Battery capacity estimating means for estimating the battery capacity of the battery when normal charging is performed;
Counting means for incrementing a normal charge recommendation counter by one when quick charge is performed and decrementing the normal charge recommendation counter by one when the battery capacity of the battery is estimated by the battery capacity estimation means;
A control device for an electric vehicle, comprising: determination means for presenting normal charge recommendation information that prompts the information presentation means to perform normal charge when it is determined that the normal charge recommendation counter exceeds a predetermined value. In the control apparatus of the electric vehicle according to claim 1 ,
The front Symbol battery, when variation occurs in the voltage of the plurality of battery cells of the battery, the balancer circuit to which the variation is charging and discharging the battery cell so as to decrease is provided,
The counting means includes
In certain conditions that might voltage varies between the battery cells, incremented by one balancer skip counter indicating that the balancer circuit is not driven,
And increments a balancer drive counter indicating that the balancer circuit is driven when normal charging is performed, and
The control device for an electric vehicle, wherein when the determination unit determines that the ratio of the balancer skip counter to the balancer drive counter exceeds a predetermined value, the information presentation unit presents the normal charging recommendation information. In the control apparatus of the electric vehicle according to claim 2,
The control apparatus for an electric vehicle, wherein the predetermined condition with which the voltage may vary between the battery cells is after a predetermined time or more has elapsed since the ignition switch was turned off. In the control apparatus of the electric vehicle according to claim 2,
The predetermined condition with which the voltage may vary between the battery cells is less than a predetermined time after the ignition switch is turned off, and the current value of the battery is equal to or less than a predetermined value. Control device.

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