JP6183157B2 - Charge control device - Google Patents

Charge control device Download PDF

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JP6183157B2
JP6183157B2 JP2013226179A JP2013226179A JP6183157B2 JP 6183157 B2 JP6183157 B2 JP 6183157B2 JP 2013226179 A JP2013226179 A JP 2013226179A JP 2013226179 A JP2013226179 A JP 2013226179A JP 6183157 B2 JP6183157 B2 JP 6183157B2
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charging
outside air
air temperature
electric vehicle
estimated
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JP2015089246A (en
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龍彦 梅谷
龍彦 梅谷
義幸 両國
義幸 両國
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Mitsubishi Motors Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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Description

本発明は、電動車のバッテリへの充電を制御する充電制御装置に関する。   The present invention relates to a charging control device that controls charging of a battery of an electric vehicle.

従来、電力を用いて走行する電気自動車やプラグインハイブリット自動車などの電動車では、車両の外装部に充電口を設け、この充電口から外部電源を供給することにより、車両内のバッテリの充電をおこなうようにしている。ここで、バッテリは温度によって特性が変化し、高温状態かつ高ＳＯＣ状態が継続すると劣化が進みやすくなることが知られている。すなわち、高温時に満充電状態となるまでバッテリを充電すると、ポリエチレン性のセパレータが酸化し、導電性を持つ事象（ポリエン化）が発生しやすくなる。このような充電によるバッテリの劣化を防止するため、たとえば下記特許文献１では、充電開始時における電動車周囲の外気温を検出し、外気温が所定値より高い場合には、充電量を小さくする、または充電速度を遅くするようにしている。   Conventionally, in an electric vehicle such as an electric vehicle or a plug-in hybrid vehicle that travels using electric power, a charging port is provided in the exterior of the vehicle, and an external power source is supplied from the charging port to charge the battery in the vehicle. I try to do it. Here, it is known that the characteristics of the battery change depending on the temperature, and the deterioration easily proceeds when the high temperature state and the high SOC state are continued. That is, when the battery is charged until the battery is fully charged at a high temperature, the polyethylene separator is oxidized, and a conductive event (polyene formation) is likely to occur. In order to prevent such deterioration of the battery due to charging, for example, in Patent Document 1 below, the outside air temperature around the electric vehicle at the start of charging is detected, and if the outside air temperature is higher than a predetermined value, the amount of charge is reduced. Or try to slow down the charging speed.

特開２０１３−５１８０９号公報JP 2013-51809 A

一般的に、ユーザは充電完了時にはバッテリが満充電状態となっていることを想定しており、また、航続可能距離を伸ばすためにも、バッテリの充電は可能な限り満充電状態となるまでおこなうことが好ましい。ここで、バッテリの劣化に影響を与えるパラメータとして、バッテリが高ＳＯＣ状態から満充電状態となる充電終盤期間の外気温が挙げられる。上記引用文献１では、バッテリの劣化が進みやすい充電終盤期間の外気温を考慮しておらず、適切な制御をおこなえない可能性がある。   In general, the user assumes that the battery is fully charged when charging is complete, and in order to extend the cruising range, the battery is charged until it is fully charged as much as possible. It is preferable. Here, as a parameter that affects the deterioration of the battery, the outside air temperature during the end of charge period in which the battery is in the fully charged state from the high SOC state can be cited. In the cited document 1, the outside air temperature during the end-of-charge period during which battery deterioration tends to proceed is not taken into consideration, and there is a possibility that appropriate control cannot be performed.

本発明は、上述した従来技術の問題点に鑑みてなされたものであり、バッテリの劣化を防止しつつ効率的に充電をおこなうことを目的とする。   The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to perform charging efficiently while preventing deterioration of the battery.

上述した問題を解決し、目的を達成するため、請求項１の発明にかかる充電制御装置は、外部電源を用いた電動車のバッテリへの充電を制御する充電制御装置であって、前記バッテリが満充電状態となる充電完了時刻を推定する充電完了時刻推定手段と、前記電動車の現在位置周辺における外気温の変化予測値を取得する予測値取得手段と、前記充電完了時刻推定手段によって推定された充電完了時刻と、前記予測値取得手段によって取得された変化予測値に基づいて、前記充電完了時刻における前記電動車の現在位置周辺の外気温である推定外気温を推定する外気温推定手段と、前記外気温推定手段によって推定された前記推定外気温に基づいて、前記バッテリの充電終了時機を決定する充電制御手段と、を備え、前記充電制御手段は、前記推定外気温が所定温度以上の場合、前記電動車への充電を前記バッテリが満充電状態となるよりも早く終了させ、前記推定外気温が所定温度未満の場合、前記バッテリが満充電状態となるまで前記電動車への充電を継続させる、ことを特徴とする。
請求項２の発明にかかる充電制御装置は、前記充電制御手段は、前記推定外気温が所定温度以上の場合には前記バッテリの充電率が１００％よりも小さい第１の所定値になると充電を終了させ、前記充電完了時刻推定手段は、前記充電率が前記第１の所定値以下である第２の所定値となった際に前記充電完了時刻を推定し、前記外気温推定手段は、前記充電率が前記第２の所定値となった際に前記推定外気温を推定し、前記充電制御手段は、前記充電率が前記第２の所定値となった際に前記充電終了時機を決定する、ことを特徴とする。
請求項３の発明にかかる充電制御装置は、前記充電完了時刻推定手段は、前記バッテリへの充電の開始時に前記充電完了時刻を推定し、前記外気温推定手段は、前記バッテリへの充電の開始時に前記推定外気温を推定し、前記充電制御手段は、前記バッテリへの充電の開始時に前記充電終了時機を決定する、ことを特徴とする。
請求項４の発明にかかる充電制御装置は、気象観測地点において過去に観測された所定時間毎の外気温の平均値を記憶する記憶手段をさらに備え、前記予測値取得手段は、ＧＰＳセンサを用いて前記電動車の現在位置を特定し、前記現在位置に最も近い前記気象観測地点における前記平均値を前記記憶手段から取得する、ことを特徴とする。
請求項５の発明にかかる充電制御装置は、前記外気温推定手段は、前記電動車の現在位置の標高を特定し、前記現在位置に最も近い前記気象観測地点との標高差に基づいて前記平均値を補正して前記推定外気温を推定する、ことを特徴とする。
請求項６の発明にかかる充電制御装置は、前記電動車の現在位置を含む地域の天気予報データを受信する受信手段をさらに備え、前記予測値取得手段は、ＧＰＳセンサを用いて前記電動車の現在位置を特定し、前記変化予測値としての前記天気予報データを前記受信手段を介して取得する、ことを特徴とする。
請求項７の発明にかかる充電制御装置は、前記電動車周辺の外気温を測定する外気温センサをさらに備え、前記外気温推定手段は、前記外気温センサによって測定された前記電動車周辺の外気温に基づいて前記変化予測値を補正して前記推定外気温を推定する、ことを特徴とする。 In order to solve the above-described problems and achieve the object, a charge control device according to the invention of claim 1 is a charge control device that controls charging of a battery of an electric vehicle using an external power source, and the battery includes Estimated by a charging completion time estimating means for estimating a charging completion time at which a fully charged state is obtained, a predicted value acquiring means for acquiring a predicted change in outside air temperature around the current position of the electric vehicle, and the charging completion time estimating means. An outside air temperature estimating means for estimating an estimated outside air temperature around the current position of the electric vehicle at the charging completion time based on the charging completion time and the predicted change value obtained by the predicted value obtaining means. Charging control means for determining when to end the charging of the battery based on the estimated outside air temperature estimated by the outside air temperature estimating means, and the charging control means comprises: When the estimated outside air temperature is equal to or higher than the predetermined temperature, the charging of the electric vehicle is terminated earlier than the battery is fully charged, and when the estimated outside air temperature is lower than the predetermined temperature, the battery is fully charged. The charging of the electric vehicle is continued until the above.
According to a second aspect of the present invention, there is provided the charging control device, wherein the charging control means performs charging when the estimated outside temperature is equal to or higher than a predetermined temperature when the charging rate of the battery becomes a first predetermined value smaller than 100%. The charging completion time estimating means estimates the charging completion time when the charging rate becomes a second predetermined value that is equal to or less than the first predetermined value, and the outside air temperature estimating means The estimated outside air temperature is estimated when the charging rate reaches the second predetermined value, and the charging control means determines the timing of completion of charging when the charging rate reaches the second predetermined value. It is characterized by that.
According to a third aspect of the present invention, the charging completion time estimating means estimates the charging completion time at the start of charging of the battery, and the outside air temperature estimating means is configured to start charging of the battery. The estimated outside air temperature is sometimes estimated, and the charging control means determines the charging end timing at the start of charging of the battery.
The charging control apparatus according to a fourth aspect of the present invention further includes storage means for storing an average value of the outside air temperature for each predetermined time observed in the past at a weather observation point, and the predicted value acquisition means uses a GPS sensor. Then, the current position of the electric vehicle is specified, and the average value at the weather observation point closest to the current position is acquired from the storage means.
In the charging control device according to the invention of claim 5, the outside air temperature estimating means specifies the altitude of the current position of the electric vehicle, and the average is based on an altitude difference from the weather observation point closest to the current position. The estimated outside air temperature is estimated by correcting the value.
The charging control apparatus according to a sixth aspect of the present invention further includes receiving means for receiving weather forecast data of a region including the current position of the electric vehicle, and the predicted value acquisition means uses a GPS sensor to detect the electric vehicle. A current position is specified, and the weather forecast data as the change prediction value is acquired via the receiving means.
The charging control apparatus according to the invention of claim 7 further includes an outside air temperature sensor that measures an outside air temperature around the electric vehicle, and the outside air temperature estimating means is an outside air temperature around the electric vehicle measured by the outside air temperature sensor. The estimated outside temperature is estimated by correcting the change prediction value based on the temperature.

請求項１の発明によれば、電動車が満充電状態となる充電完了時における推定外気温が所定温度以上の場合、電動車への充電をバッテリが満充電状態となるよりも早く終了させ（抑制充電）、推定外気温が所定温度未満の場合、バッテリが満充電状態となるまで電動車への充電を継続させる（フル充電）。これにより、バッテリの劣化につながる可能性がある高温時のフル充電を回避することができ、バッテリの性能を長期に渡って維持することができる。
請求項２の発明によれば、バッテリの充電率（ＳＯＣ）が第２の所定値になったタイミングで充電完了時刻の推定等をおこなうので、充電開始直後に上記推定等をおこなうよりも充電完了時刻や推定外気温の推定精度を向上させることができ、抑制充電をおこなうか否かを適切に判断することができる。また、バッテリの劣化が進みにくいため安全が確保される低ＳＯＣ状態では、外気温が所定温度以上であっても充電が許可されるので、必要最低限の航続距離を確保できる。
請求項３の発明によれば、充電開始時に充電完了時刻の推定や抑制充電をおこなうか否かの判断等をおこなうので、ユーザが充電開始時に充電所要時間や抑制充電をおこなうか否かを把握することができる。
請求項４の発明によれば、外気温の変化予測値として、気象観測地点において過去に観測された所定時間毎の外気温の平均値を用いるので、充電制御装置に各地域における外気温の変化予測値を記憶することができ、充電制御装置が通信手段を備えることなく外気温の変化予測値を得ることができる。
請求項５の発明によれば、電動車の現在位置と気象観測地点との標高差に基づいて外気温の平均値を補正して推定外気温を推定するので、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。
請求項６の発明によれば、外気温の変化予測値として天気予報データを用いるので、実際の気象条件を加味した変化予測値を得ることができ、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。
請求項７の発明によれば、電動車周辺の外気温に基づいて変化予測値を補正して推定外気温を推定するので、変化予測値と実際の外気温とのずれを補正することができ、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。 According to the first aspect of the present invention, when the estimated outside temperature at the completion of charging when the electric vehicle is fully charged is equal to or higher than a predetermined temperature, charging of the electric vehicle is terminated earlier than when the battery is fully charged ( When the estimated outside air temperature is lower than the predetermined temperature, charging of the electric vehicle is continued until the battery is fully charged (full charge). Thereby, the full charge at the time of high temperature which may lead to the deterioration of the battery can be avoided, and the performance of the battery can be maintained for a long time.
According to the invention of claim 2, since the charging completion time is estimated when the battery charge rate (SOC) reaches the second predetermined value, the charging is completed rather than performing the above estimation immediately after the start of charging. It is possible to improve the estimation accuracy of the time and the estimated outside air temperature, and to appropriately determine whether or not to perform suppressed charging. Further, in a low SOC state in which safety is ensured because the deterioration of the battery is difficult to proceed, charging is permitted even if the outside air temperature is equal to or higher than a predetermined temperature, so that the necessary minimum cruising distance can be ensured.
According to the invention of claim 3, since the charging completion time is estimated at the start of charging, or whether or not to perform suppression charging is performed, it is grasped whether the user performs charging required time or suppression charging at the start of charging. can do.
According to the invention of claim 4, since the average value of the outside air temperature at every predetermined time observed in the past at the weather observation point is used as the outside air temperature change predicting value, the charging control device changes the outside air temperature in each region. The predicted value can be stored, and the change control value of the outside air temperature can be obtained without the charge control device having communication means.
According to the invention of claim 5, since the estimated outside temperature is estimated by correcting the average value of the outside temperature based on the altitude difference between the current position of the electric vehicle and the weather observation point, the estimation accuracy of the estimated outside temperature is improved. Thus, it is possible to appropriately determine whether or not to perform suppression charging.
According to the invention of claim 6, since the weather forecast data is used as the predicted change value of the outside air temperature, it is possible to obtain a predicted change value that takes into account the actual weather conditions, and to improve and suppress the estimation accuracy of the estimated outside temperature. It is possible to appropriately determine whether or not to perform charging.
According to the invention of claim 7, since the estimated outside temperature is estimated by correcting the change predicted value based on the outside temperature around the electric vehicle, the deviation between the change predicted value and the actual outside temperature can be corrected. Therefore, it is possible to improve the estimation accuracy of the estimated outside air temperature and appropriately determine whether or not to perform the suppression charging.

実施の形態にかかる充電制御装置１０の構成を示すブロック図である。It is a block diagram which shows the structure of the charge control apparatus 10 concerning embodiment. 外気温の変化予測値の一例を示すグラフである。It is a graph which shows an example of the change predicted value of outside temperature. 図２の変化予測値に対して補正をおこなった結果を示すグラフである。It is a graph which shows the result of having corrected with respect to the change prediction value of FIG. 図３に示す変化予測値に基づく充電終了時機の判定結果を示す表である。It is a table | surface which shows the determination result of the charge end time based on the change estimated value shown in FIG. 充電制御装置１０の処理の手順を示すフローチャートである。4 is a flowchart showing a processing procedure of the charging control device 10. 充電制御装置１０の処理の手順を示すフローチャートである。4 is a flowchart showing a processing procedure of the charging control device 10.

以下に添付図面を参照して、本発明にかかる充電制御装置の好適な実施の形態を詳細に説明する。   Exemplary embodiments of a charge control device according to the present invention will be explained below in detail with reference to the accompanying drawings.

（実施の形態）
図１は、実施の形態にかかる充電制御装置１０の構成を示すブロック図である。本実施の形態では、充電制御装置１０は、電気自動車である電動車２０に搭載されている。電動車２０は、走行用バッテリ２０２に蓄積された電力を用いてモータ２０４を駆動して走行する。なお、電動車２０は、エンジンとモータとを用いて走行するプラグインハイブリット車であってもよい。 (Embodiment)
FIG. 1 is a block diagram illustrating a configuration of a charge control device 10 according to the embodiment. In the present embodiment, the charging control device 10 is mounted on an electric vehicle 20 that is an electric vehicle. The electric vehicle 20 travels by driving the motor 204 using the electric power stored in the traveling battery 202. The electric vehicle 20 may be a plug-in hybrid vehicle that travels using an engine and a motor.

電動車２０の走行用バッテリ２０２は、外部電源を供給する外部充電装置３０によって充電される。より詳細には、外部充電装置３０の充電装置側コネクタ３０２を、電動車２０の車体外部等に設けられた車両側コネクタ２０６に接続し、走行用バッテリ２０２の充電をおこなう。車両側コネクタ２０６を介して供給された電力は、充電器２０８を介して走行用バッテリ２０２に蓄電される。走行用バッテリ２０２には、バッテリ温度を検出するバッテリ温度センサ２１０が設けられている。なお、電動車２０には、走行用バッテリ２０２と別に車内の電装機器等を駆動させる補機用バッテリ（図示なし）が設けられている。補機バッテリの充電は、たとえば走行用バッテリ２０２に蓄積された電力を降圧して供給することによっておこなう。   The traveling battery 202 of the electric vehicle 20 is charged by the external charging device 30 that supplies external power. More specifically, the charging device side connector 302 of the external charging device 30 is connected to a vehicle side connector 206 provided outside the vehicle body of the electric vehicle 20 to charge the traveling battery 202. The electric power supplied via the vehicle-side connector 206 is stored in the traveling battery 202 via the charger 208. The traveling battery 202 is provided with a battery temperature sensor 210 that detects the battery temperature. In addition, the electric vehicle 20 is provided with an auxiliary battery (not shown) for driving electric equipment in the vehicle, in addition to the traveling battery 202. The auxiliary battery is charged by, for example, stepping down and supplying the electric power stored in the traveling battery 202.

充電制御装置１０は、外部電源を用いた電動車２０のバッテリ（走行用バッテリ２０２）への充電を制御する。より詳細には、充電制御装置１０は、走行用バッテリ２０２の充電率（ＳＯＣ：Ｓｔａｔｅ Ｏｆ Ｃｈａｒｇｅ）を監視しつつ、ＳＯＣが目標充電率となるように充電器２０８における充電電圧や充電電流量を制御する。
充電制御装置１０には、ＧＰＳセンサ２１２、外気温センサ２１４、高度計２１６、カレンダー２１８、温度情報データベース２２０が接続されている。
ＧＰＳセンサ２１２は、ＧＰＳ衛星からの発振電波を受信して、電動車２０の現在位置を特定する。ＧＰＳセンサ２１２は、たとえば電動車２０の現在位置を緯度経度情報として特定する。
外気温センサ２１４は、電動車２０周辺の外気温を測定する。
高度計２１６は、電動車２０の現在位置の標高を測定する。なお、高度計２１６として気圧計を用いてもよい。また、充電制御装置１０に各地点における標高データを含む地図データを記憶しておき、ＧＰＳセンサ２１２によって特定された現在位置の標高データを読み出すことによって現在位置の標高を特定してもよい。
カレンダー２１８は、現在の年月日および時刻を特定する。
温度情報データベース２２０（記憶手段）は、全国各地に設けられた気象観測地点において過去に観測された外気温の平均値を記憶する。温度情報データベース２２０には、各気象観測地点の位置情報（緯度経度情報）および過去所定期間における時間単位の外気温の平均値が月日ごとに記録されている。 The charging control device 10 controls charging of the battery (the traveling battery 202) of the electric vehicle 20 using an external power source. More specifically, the charging control device 10 monitors the charging rate (SOC: State Of Charge) of the battery 202 for traveling, and sets the charging voltage and the charging current amount in the charger 208 so that the SOC becomes the target charging rate. Control.
Connected to the charging control device 10 are a GPS sensor 212, an outside air temperature sensor 214, an altimeter 216, a calendar 218, and a temperature information database 220.
The GPS sensor 212 receives an oscillation wave from a GPS satellite and specifies the current position of the electric vehicle 20. The GPS sensor 212 specifies the current position of the electric vehicle 20 as latitude and longitude information, for example.
The outside air temperature sensor 214 measures the outside air temperature around the electric vehicle 20.
The altimeter 216 measures the altitude of the current position of the electric vehicle 20. A barometer may be used as the altimeter 216. Alternatively, map data including altitude data at each point may be stored in the charging control device 10, and the altitude data at the current position identified by the GPS sensor 212 may be read to identify the altitude at the current position.
The calendar 218 specifies the current date and time.
The temperature information database 220 (storage means) stores an average value of outside temperatures observed in the past at weather observation points provided in various places throughout the country. In the temperature information database 220, the position information (latitude / longitude information) of each weather observation point and the average value of the outside temperature in units of time in the past predetermined period are recorded for each month and day.

充電制御装置１０は、機能的には、充電完了時刻推定手段１０２、予測値取得手段１０４、外気温推定手段１０６および充電制御手段１０８を含んで構成される。
充電制御装置１０は、具体的には、ＣＰＵ、制御プログラムなどを格納・記憶するＲＯＭ、制御プログラムの作動領域としてのＲＡＭ、各種データを書き換え可能に保持するＥＥＰＲＯＭ、周辺回路等とのインターフェースをとるインターフェース部などを含んで構成される。上記各機能部は、前記ＣＰＵにより前記制御プログラムを実行することによって実現する。 Functionally, the charging control apparatus 10 includes a charging completion time estimation unit 102, a predicted value acquisition unit 104, an outside air temperature estimation unit 106, and a charging control unit 108.
Specifically, the charging control device 10 has an interface with a CPU, a ROM that stores and stores a control program, a RAM as an operation area of the control program, an EEPROM that holds various data in a rewritable manner, a peripheral circuit, and the like. It includes an interface unit and the like. Each of the functional units is realized by executing the control program by the CPU.

充電完了時刻推定手段１０２は、走行用バッテリ２０２が満充電状態となる充電完了時刻を推定する。充電完了時刻推定手段１０２は、現在時刻、走行用バッテリ２０２の現在のＳＯＣ、充電の種類（定電圧（ＣＶ）充電か定電流（ＣＣ）充電か、急速充電か普通充電かなど）、充電電流量等に基づいて、充電時に走行用バッテリ２０２のＳＯＣが１００％（満充電状態）となる充電完了時刻を推定する。   The charging completion time estimation means 102 estimates the charging completion time when the traveling battery 202 is fully charged. The charging completion time estimation means 102 includes the current time, the current SOC of the traveling battery 202, the type of charging (constant voltage (CV) charging or constant current (CC) charging, rapid charging or normal charging, etc.), charging current Based on the amount and the like, the charging completion time when the SOC of the traveling battery 202 becomes 100% (full charge state) at the time of charging is estimated.

予測値取得手段１０４は、電動車２０の現在位置周辺における外気温の変化予測値を取得する。本実施の形態では、外気温の変化予測値は、温度情報データベース２２０（記憶手段）に記録された過去に観測された外気温の平均値とする。予測値取得手段１０４は、ＧＰＳセンサ２１２を用いて特定された電動車の現在位置に基づいて、現在位置に最も近い気象観測地点における平均値を温度情報データベース２２０から取得する。より詳細には、予測値取得手段１０４は、カレンダー２１８を参照して現在の年月日および時刻を特定し、温度情報データベース２２０から現在の月日と同じ月日における時間単位の外気温の平均値を、少なくとも充電完了時刻を含む時刻分まで読み出す。   The predicted value acquisition unit 104 acquires a predicted change value of the outside air temperature around the current position of the electric vehicle 20. In the present embodiment, the predicted change value of the outside air temperature is the average value of the outside air temperatures observed in the past recorded in the temperature information database 220 (storage means). The predicted value acquisition unit 104 acquires an average value at the weather observation point closest to the current position from the temperature information database 220 based on the current position of the electric vehicle specified using the GPS sensor 212. More specifically, the predicted value acquisition unit 104 refers to the calendar 218 to identify the current date and time, and from the temperature information database 220, the average of the outside temperature in units of time on the same date as the current date The value is read up to the time including at least the charging completion time.

図２は、外気温の変化予測値の一例を示すグラフである。図２において、縦軸は外気温、横軸は時刻である。図２に示すように、変化予測値は、たとえば１時間ごとの外気温の値として得られる。変化予測値の周期は、１時間ごとに限らず、たとえば３時間ごとや３０分ごとなどであってもよい。   FIG. 2 is a graph showing an example of a predicted change in outside air temperature. In FIG. 2, the vertical axis represents the outside air temperature, and the horizontal axis represents the time. As shown in FIG. 2, the predicted change value is obtained, for example, as the value of the outside air temperature every hour. The period of the change prediction value is not limited to every hour, but may be every 3 hours or every 30 minutes, for example.

また、予測値取得手段１０４で取得する外気温の変化予測値は、電動車２０の現在位置を含む地域の天気予報データであってもよい。この場合、予測値取得手段１０４は、ＧＰＳセンサ２１２を用いて電動車の現在位置を特定し、無線通信装置（受信手段）等を用いて現在位置を含む地域の天気予報データを取得する。天気予報データには所定時間ごと（たとえば１時間ごと）の予想気温が含まれているため、気象状況を反映した外気温の変化予測値を得ることができる。   Further, the predicted change value of the outside air temperature acquired by the predicted value acquisition unit 104 may be weather forecast data for a region including the current position of the electric vehicle 20. In this case, the predicted value acquisition unit 104 specifies the current position of the electric vehicle using the GPS sensor 212 and acquires the weather forecast data of the area including the current position using a wireless communication device (reception unit) or the like. Since the forecast temperature is included in the weather forecast data every predetermined time (for example, every hour), a predicted change value of the outside temperature reflecting the weather condition can be obtained.

また、予測値取得手段１０４で取得する外気温の変化予測値は、外気温センサ２１４で測定し、記録した温度データであってもよい。たとえば、外気温センサ２１４で測定した温度データを、ＧＰＳセンサ２１２で特定した電動車２０の現在位置と関連付けて記録しておき、月日や季節ごとなどで統計することによって、外気温の変化予測値として用いることができる。特に、自宅等、毎回同じ場所で充電をおこなう場合には、ピンポイントの変化予測値を得ることができ、精度よく外気温を推定することができる。   Further, the predicted change value of the outside air temperature acquired by the predicted value acquisition unit 104 may be temperature data measured and recorded by the outside air temperature sensor 214. For example, the temperature data measured by the outside air temperature sensor 214 is recorded in association with the current position of the electric vehicle 20 specified by the GPS sensor 212, and the outside air temperature change prediction is performed by performing statistics for each month or day. Can be used as a value. In particular, when charging is performed at the same place, such as at home, a pinpoint change predicted value can be obtained, and the outside air temperature can be accurately estimated.

外気温推定手段１０６は、充電完了時刻推定手段１０２によって推定された充電完了時刻と、予測値取得手段１０４によって取得された変化予測値に基づいて、充電完了時刻における電動車２０の現在位置周辺の外気温（以下、「推定外気温」という）を推定する。
図２を用いて具体的に説明すると、充電完了時刻が１４時の場合は、充電完了時刻における推定外気温は約４７．５℃と推定することができる。 Based on the charge completion time estimated by the charge completion time estimation means 102 and the predicted change value acquired by the predicted value acquisition means 104, the outside air temperature estimation means 106 is based on the vicinity of the current position of the electric vehicle 20 at the charge completion time. The outside air temperature (hereinafter referred to as “estimated outside air temperature”) is estimated.
Specifically, when the charging completion time is 14:00, the estimated outside air temperature at the charging completion time can be estimated to be about 47.5 ° C.

このとき、外気温推定手段１０６は、外気温の変化予測値に対して補正をおこなった上で推定外気温を推定してもよい。
具体的には、たとえば、外気温推定手段１０６は、電動車２０の現在位置の標高を特定し、現在位置に最も近い気象観測地点との標高差に基づいて変化予測値（当該気象観測地点で観測された気温の平均値）を補正（高度補正）するようにしてもよい。より詳細には、たとえば温度情報データベース２２０の気象観測地点の位置情報に当該地点の標高も記憶しておき、電動車２０の現在位置との標高差を特定する。そして、高度が１００ｍ上がるごとに気温は０．６℃下がるものとして平均値に対して補正をおこなう。 At this time, the outside air temperature estimation means 106 may estimate the estimated outside air temperature after correcting the change predicted value of the outside air temperature.
Specifically, for example, the outside air temperature estimation means 106 identifies the altitude of the current position of the electric vehicle 20, and based on the altitude difference from the weather observation point closest to the current position, the change predicted value (at the meteorological observation point). The average value of the observed temperatures may be corrected (altitude correction). More specifically, for example, the altitude of the point is stored in the position information of the weather observation point in the temperature information database 220, and the altitude difference from the current position of the electric vehicle 20 is specified. Then, every time the altitude increases by 100 m, the temperature is reduced by 0.6 ° C., and the average value is corrected.

また、外気温推定手段１０６は、外気温センサ２１４によって測定された電動車２０周辺の外気温に基づいて変化予測値を補正するようにしてもよい。具体的には、現在事項の電動車２０周辺の外気温と現在時刻に対応する変化予測値とを比較して、その差分だけ現在時刻以降の変化予測値を補正する。   Further, the outside air temperature estimating means 106 may correct the predicted change value based on the outside air temperature around the electric vehicle 20 measured by the outside air temperature sensor 214. Specifically, the outside air temperature around the electric vehicle 20 in the current matter is compared with the change prediction value corresponding to the current time, and the change prediction value after the current time is corrected by the difference.

図３は、図２の変化予測値に対して補正をおこなった結果を示すグラフである。図３のグラフにおいて、縦軸は外気温、横軸は時刻である。
図３の曲線Ａが補正前の変化予測値（図２の曲線Ａ）であり、曲線Ｂ，Ｃ，Ｄが補正後の変化予測値である。曲線Ｂ，Ｃ，Ｄに示す補正後の変化予測値は、曲線Ａに示す補正前の変化予測値を、たとえば標高差や実際の外気温との差分に応じて平行移動させたものである。
このような補正をおこなうことによって、より正確な推定外気温を推定することが可能となる。図３を用いて具体的に説明すると、たとえば補正前の変化予測値が曲線Ａの場合、充電完了時刻が１４時とすると推定外気温は約４７．５℃である。一方、補正の結果、変化予測値が曲線Ｄとなった場合、充電完了時刻が１４時の場合は推定外気温は約４２．５℃と推定することができる。
また、補正前の変化予測値と補正後の変化予測値とが所定値以上（例えば１５℃以上）乖離している場合は、電動車２０が空調の効いた建物内で充電されていると判断して、充電目標ＳＯＣを満充電状態（ＳＯＣ１００％）に設定するようにしてもよい。 FIG. 3 is a graph showing a result of correcting the predicted change value shown in FIG. In the graph of FIG. 3, the vertical axis represents the outside air temperature, and the horizontal axis represents the time.
A curve A in FIG. 3 is a change predicted value before correction (curve A in FIG. 2), and curves B, C, and D are change predicted values after correction. The predicted change values after correction indicated by the curves B, C, and D are obtained by translating the predicted change value before correction indicated by the curve A according to, for example, an altitude difference or a difference from the actual outside air temperature.
By performing such correction, it is possible to estimate a more accurate estimated outside temperature. Specifically, using FIG. 3, for example, when the predicted change value before correction is curve A, the estimated outside air temperature is about 47.5 ° C. when the charge completion time is 14:00. On the other hand, when the predicted change value becomes the curve D as a result of the correction, the estimated outside air temperature can be estimated to be about 42.5 ° C. when the charging completion time is 14:00.
Further, if the change prediction value before correction and the change prediction value after correction are different from each other by a predetermined value or more (for example, 15 ° C. or more), it is determined that the electric vehicle 20 is charged in a building in which air conditioning is effective. Then, the charging target SOC may be set to a fully charged state (SOC 100%).

充電制御手段１０８は、外気温推定手段１０６によって予測された推定外気温に基づいて、走行用バッテリ２０２の充電終了時機を決定する。充電制御手段１０８は、推定外気温が所定温度以上の場合、電動車２０への充電を走行用バッテリ２０２が満充電状態となるよりも早く終了させ、推定外気温が所定温度未満の場合、走行用バッテリ２０２が満充電状態となるまで電動車２０への充電を継続させる。
図３を用いて具体的に説明すると、上記所定温度を４５℃とした場合、充電完了時刻における推定外気温が４５℃以上の場合は、走行用バッテリ２０２が満充電状態となるよりも充電を早く終了させる。また、充電完了時刻における推定外気温が４５℃未満の場合、走行用バッテリ２０２が満充電状態（ＳＯＣ１００％）となるまで電動車２０への充電を継続させる。
図４は、図３に示す変化予測値に基づく充電終了時機の判定結果を示す表であり、丸印（〇）は走行用バッテリ２０２が満充電状態となるまで充電を継続させることを示し、バツ印（×）は走行用バッテリ２０２が満充電状態となるよりも充電を早く終了させることを示す。
たとえば、充電完了時刻が１４時の場合、外気温の変化予測値が曲線Ｄの場合は走行用バッテリ２０２が満充電状態となるまで電動車２０への充電を継続させるが、これ以外の曲線Ａ，Ｂ，Ｃの場合は走行用バッテリ２０２が満充電状態となるよりも充電を早く終了させる。 Based on the estimated outside air temperature predicted by the outside air temperature estimating unit 106, the charging control unit 108 determines when to end the charging of the traveling battery 202. When the estimated outside air temperature is equal to or higher than the predetermined temperature, the charging control unit 108 terminates the charging of the electric vehicle 20 earlier than the traveling battery 202 is fully charged. When the estimated outside air temperature is lower than the predetermined temperature, the charging control unit 108 travels. The electric vehicle 20 is continuously charged until the battery 202 is fully charged.
Specifically, referring to FIG. 3, when the predetermined temperature is 45 ° C., when the estimated outside air temperature at the charging completion time is 45 ° C. or higher, the battery 202 for charging is charged more than the fully charged state. Finish early. When the estimated outside air temperature at the charging completion time is less than 45 ° C., charging of the electric vehicle 20 is continued until the traveling battery 202 is fully charged (SOC 100%).
FIG. 4 is a table showing the determination result of the charging end timing based on the predicted change value shown in FIG. 3, and a circle (◯) indicates that charging is continued until the traveling battery 202 is fully charged, The cross mark (x) indicates that charging is terminated earlier than the traveling battery 202 is fully charged.
For example, when the charge completion time is 14:00, when the predicted change value of the outside air temperature is the curve D, the electric vehicle 20 is continuously charged until the traveling battery 202 is fully charged. , B, and C, charging is terminated earlier than the traveling battery 202 is fully charged.

充電を早期に終了させる場合の充電終了タイミングは任意であるが、本実施の形態では走行用バッテリ２０２のＳＯＣが９５％となるまでとする。すなわち、充電制御手段１０８は、外気温が所定温度以上の場合には走行用バッテリ２０２のＳＯＣが１００％よりも小さい第１の所定値である９５％になると充電を終了させる。
また、充電完了時刻推定手段１０２は、充電中に走行用バッテリ２０２のＳＯＣが第１の所定値である９５％よりも小さい第２の所定値である９０％となった際に充電完了時刻を推定する。さらに、外気温推定手段１０６は、ＳＯＣが第２の所定値である９０％となった際に充電完了時刻における推定外気温を推定し、充電制御手段１０８は、ＳＯＣが第２の所定値である９０％となった際に充電終了時機を決定する。
すなわち、本実施の形態では、走行用バッテリ２０２のＳＯＣが９０％になるまで充電をおこない、ＳＯＣが９０％になった段階で満充電状態となるまで充電を継続させるか（フル充電）、満充電状態となるよりも充電を早く終了させるか（抑制充電）を判断する。
なお、本実施例では第２の所定値を第１の所定値よりも小さい値としたが、第１の所定値と第２の所定値とを等しくしても良い。この場合、推定外気温が所定温度以上であると判断された際は直ちに充電を終了させる。 The charging end timing when charging is terminated early is arbitrary, but in this embodiment, the SOC of the traveling battery 202 is 95%. That is, when the outside air temperature is equal to or higher than the predetermined temperature, the charging control unit 108 ends the charging when the SOC of the traveling battery 202 reaches 95%, which is a first predetermined value smaller than 100%.
Further, the charging completion time estimating means 102 sets the charging completion time when the SOC of the traveling battery 202 becomes 90% which is a second predetermined value which is smaller than 95% which is the first predetermined value during charging. presume. Furthermore, the outside air temperature estimating means 106 estimates the estimated outside air temperature at the charging completion time when the SOC reaches the second predetermined value of 90%, and the charging control means 108 determines that the SOC is the second predetermined value. When it reaches 90%, the end time of charging is determined.
That is, in the present embodiment, charging is performed until the SOC of the traveling battery 202 reaches 90%, and charging is continued until the SOC reaches 90% (full charge) until the SOC reaches 90%. It is determined whether charging should be terminated earlier than when the charging state is reached (suppressed charging).
In the present embodiment, the second predetermined value is set to a value smaller than the first predetermined value, but the first predetermined value and the second predetermined value may be equal. In this case, when it is determined that the estimated outside air temperature is equal to or higher than the predetermined temperature, the charging is immediately terminated.

図５は、充電制御装置１０による処理の手順を示すフローチャートである。
図５のフローチャートにおいて、充電制御装置１０は、電動車２０が停車されキーオフ状態となるまで待機する（ステップＳ５０２：Ｎｏのループ）。電動車２０がキーオフ状態となると（ステップＳ５０２：Ｙｅｓ）、外気温センサ２１４により検出された電動車２０周辺の外気温を取得するとともに（ステップＳ５０４）、バッテリ温度センサ２１０により検出された走行用バッテリ２０２のバッテリ温度を取得する（ステップＳ５０６）。また、ＧＰＳセンサ２１２によって特定された電動車２０の現在位置を取得する（ステップＳ５０８）。なお、電動車２０周辺の外気温およびバッテリ温度の検出は、キーオン状態時にも継続しておこなっている。また、この時点でバッテリ温度等に異常があった場合は、充電をおこなわないように運転者等に対して報知する。 FIG. 5 is a flowchart illustrating a processing procedure performed by the charging control apparatus 10.
In the flowchart of FIG. 5, the charging control device 10 stands by until the electric vehicle 20 stops and enters a key-off state (step S502: No loop). When the electric vehicle 20 enters the key-off state (step S502: Yes), the outside air temperature around the electric vehicle 20 detected by the outside air temperature sensor 214 is acquired (step S504), and the traveling battery detected by the battery temperature sensor 210 is acquired. The battery temperature of 202 is acquired (step S506). Further, the current position of the electric vehicle 20 specified by the GPS sensor 212 is acquired (step S508). The detection of the outside air temperature and the battery temperature around the electric vehicle 20 is continuously performed even in the key-on state. Further, if there is an abnormality in the battery temperature or the like at this time, the driver or the like is notified so as not to perform charging.

充電制御装置１０は、車両側コネクタ２０６に充電装置側コネクタ３０２が接続されて外部電源を用いた外部充電が開始されると（ステップＳ５１０：Ｙｅｓ）、走行用バッテリ２０２のＳＯＣが９０％以上となるまで（ステップＳ５１２：Ｎｏ）、充電を継続する（ステップＳ５１４）。なお、外部充電が開始されない場合には（ステップＳ５１０：Ｎｏ）、ステップＳ５０２に戻り、外気温などを検出しながら待機する。また、充電開始時には、充電目標ＳＯＣをたとえば１００％（通常充電）に設定する。   When the charging device side connector 302 is connected to the vehicle side connector 206 and external charging using an external power supply is started (step S510: Yes), the charging control device 10 has an SOC of the traveling battery 202 of 90% or more. Until it becomes (step S512: No), the charging is continued (step S514). If external charging is not started (step S510: No), the process returns to step S502 and waits while detecting the outside air temperature and the like. At the start of charging, the charging target SOC is set to 100% (normal charging), for example.

走行用バッテリ２０２のＳＯＣが９０％以上になると（ステップＳ５１２：Ｙｅｓ）、充電完了時刻推定手段１０２は、走行用バッテリ２０２が満充電状態となる充電完了時刻を推定する（ステップＳ５１６）。また、予測値取得手段１０４は、現在時刻から充電完了時刻までの外気温の変化予測値を温度情報データベース２２０から読み出す（ステップＳ５１８）。そして、外気温推定手段１０６は、充電完了時刻における電動車２０の現在位置周辺の推定外気温を推定する（ステップＳ５２０）。   When the SOC of traveling battery 202 reaches 90% or more (step S512: Yes), charging completion time estimating means 102 estimates the charging completion time at which traveling battery 202 is fully charged (step S516). Further, the predicted value acquisition unit 104 reads the predicted change value of the outside air temperature from the current time to the charging completion time from the temperature information database 220 (step S518). Then, the outside air temperature estimating means 106 estimates the estimated outside air temperature around the current position of the electric vehicle 20 at the charging completion time (step S520).

充電制御手段１０８は、ステップＳ５０２で推定された推定外気温が所定温度以上か否かを判断する（ステップＳ５２２）。推定外気温が所定温度以上の場合（ステップＳ５２２：Ｙｅｓ）、充電制御手段１０８は、充電目標ＳＯＣを９５％に設定する（ステップＳ５２４）。すなわち、走行用バッテリ２０２が満充電状態となるよりも充電を早く終了させるようにする。一方、推定外気温が所定温度未満の場合（ステップＳ５２２：Ｎｏ）、充電制御手段１０８は、充電目標ＳＯＣを１００％に設定する（ステップＳ５２６）。すなわち、走行用バッテリ２０２が満充電状態となるまで充電を継続させる。   The charging control unit 108 determines whether or not the estimated outside air temperature estimated in step S502 is equal to or higher than a predetermined temperature (step S522). When the estimated outside air temperature is equal to or higher than the predetermined temperature (step S522: Yes), the charging control unit 108 sets the charging target SOC to 95% (step S524). That is, charging is terminated earlier than the traveling battery 202 is fully charged. On the other hand, when the estimated outside air temperature is lower than the predetermined temperature (step S522: No), the charging control unit 108 sets the charging target SOC to 100% (step S526). That is, the charging is continued until the traveling battery 202 is fully charged.

充電制御手段１０８は、走行用バッテリ２０２のＳＯＣが充電目標ＳＯＣ以上になるまでは（ステップＳ５２８：Ｎｏ）、充電を継続させる（ステップＳ５３０）。そして、走行用バッテリ２０２のＳＯＣが充電目標ＳＯＣ以上になると（ステップＳ５２８：Ｙｅｓ）、走行用バッテリ２０２への充電を終了させ（ステップＳ５３２）、本フローチャートの処理を終了する。   The charging control unit 108 continues the charging until the SOC of the traveling battery 202 becomes equal to or higher than the charging target SOC (step S528: No) (step S530). Then, when the SOC of traveling battery 202 becomes equal to or higher than the charging target SOC (step S528: Yes), charging of traveling battery 202 is terminated (step S532), and the process of this flowchart is terminated.

以上説明したように、実施の形態１にかかる充電制御装置１０は、電動車２０が満充電状態となる充電完了時における推定外気温が所定温度以上の場合、電動車への充電を走行用バッテリ２０２が満充電状態となるよりも早く終了させ（抑制充電）、推定外気温が所定温度未満の場合、走行用バッテリ２０２が満充電状態となるまで電動車への充電を継続させる（フル充電）。これにより、走行用バッテリ２０２の劣化につながる可能性がある高温時のフル充電を回避することができ、走行用バッテリ２０２の性能を長期に渡って維持することができる。   As described above, the charging control apparatus 10 according to the first embodiment charges the electric vehicle when the estimated outside temperature at the completion of charging when the electric vehicle 20 is fully charged is equal to or higher than a predetermined temperature. 202 is terminated earlier than full charge (suppressed charge), and when the estimated outside air temperature is lower than a predetermined temperature, charging of the electric vehicle is continued until the traveling battery 202 is fully charged (full charge). . Thereby, the full charge at the time of the high temperature which may lead to deterioration of the traveling battery 202 can be avoided, and the performance of the traveling battery 202 can be maintained for a long time.

また、充電制御装置１０は、走行用バッテリ２０２のＳＯＣが第２の所定値（本実施の形態では９０％）になったタイミングで充電完了時刻の推定等をおこなうので、充電開始直後に上記推定等をおこなうよりも充電完了時刻や推定外気温の推定精度を向上させることができ、抑制充電をおこなうか否かを適切に判断することができる。
また、充電制御装置１０は、外気温の変化予測値として、気象観測地点において過去に観測された所定時間毎の外気温の平均値を用いるので、充電制御装置１０に各地域における外気温の変化予測値を記憶しておくことができ、充電制御装置１０が通信手段を備えていない場合でも外気温の変化予測値を得ることができる。 Further, the charging control device 10 estimates the charging completion time at the timing when the SOC of the traveling battery 202 reaches the second predetermined value (90% in the present embodiment). Thus, the estimation accuracy of the charging completion time and the estimated outside air temperature can be improved as compared to performing the above, and it is possible to appropriately determine whether or not to perform the suppression charging.
Moreover, since the charging control apparatus 10 uses the average value of the outside air temperature at every predetermined time observed in the past at the weather observation point as the predicted outside air temperature change value, the charging control apparatus 10 changes the outside air temperature in each region. A predicted value can be stored, and a predicted change value of the outside air temperature can be obtained even when the charging control apparatus 10 does not include a communication unit.

また、充電制御装置１０において、電動車の現在位置と気象観測地点との標高差に基づいて外気温の平均値を補正して推定外気温を推定するようにすれば、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。
また、充電制御装置１０において、外気温の変化予測値として天気予報データを用いるようにすれば、実際の気象条件を加味した変化予測値を得ることができ、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。
また、充電制御装置１０において、電動車２０周辺の外気温に基づいて変化予測値を補正して推定外気温を推定するようにすれば、変化予測値と実際の外気温とのずれを補正することができ、推定外気温の推定精度を向上させ、抑制充電をおこなうか否かを適切に判断することができる。さらに、空調が整備された建物や車庫等の内部で充電する際は、電動車２０周辺の外気温に基づいて変化予測値を補正することで、建物外部が高温であったとしても満充電状態まで充電が可能となる。 Further, if the charging control device 10 estimates the estimated outside temperature by correcting the average value of the outside temperature based on the altitude difference between the current position of the electric vehicle and the weather observation point, the estimation accuracy of the estimated outside temperature is estimated. It is possible to appropriately determine whether or not to perform suppression charging.
In addition, if the weather control data is used as the change prediction value of the outside air temperature in the charging control device 10, a change prediction value that takes into account actual weather conditions can be obtained, and the estimation accuracy of the estimated outside air temperature can be improved. It is possible to appropriately determine whether or not to perform suppression charging.
Further, in the charging control device 10, if the estimated outside temperature is estimated by correcting the change predicted value based on the outside temperature around the electric vehicle 20, the deviation between the predicted change value and the actual outside temperature is corrected. Therefore, it is possible to improve the estimation accuracy of the estimated outside air temperature and appropriately determine whether or not to perform suppressed charging. Furthermore, when charging inside an air-conditioned building or garage, the change prediction value is corrected based on the outside air temperature around the electric vehicle 20, so that the fully charged state is maintained even if the outside of the building is hot. Can be charged.

（実施の形態２）
実施の形態１では、充電制御装置１０は、走行用バッテリ２０２に対する充電をＳＯＣが第２の所定値となるまでおこなってからフル充電するか抑制充電するかを判断した。
実施の形態２では、走行用バッテリ２０２に対する充電の開始直後にフル充電するか抑制充電するかを判断する。すなわち、充電完了時刻推定手段１０２は、走行用バッテリ２０２への充電の開始時に充電完了時刻を推定し、外気温推定手段１０６は、走行用バッテリ２０２への充電の開始時に推定外気温を推定し、充電制御手段１０８は、走行用バッテリ２０２への充電の開始時に充電終了時機を決定する。
なお、実施の形態２における充電制御装置１０の構成は、実施の形態１と同様であるので、詳細な説明を省略する。 (Embodiment 2)
In the first embodiment, the charging control device 10 determines whether to charge the traveling battery 202 until the SOC reaches the second predetermined value and then perform full charging or suppression charging.
In the second embodiment, it is determined whether full charging or suppression charging is performed immediately after the start of charging of the traveling battery 202. That is, the charging completion time estimating means 102 estimates the charging completion time when charging of the traveling battery 202 is started, and the outside air temperature estimating means 106 estimates the estimated outside temperature when charging of the traveling battery 202 is started. The charging control means 108 determines a charging end time when charging of the traveling battery 202 is started.
In addition, since the structure of the charge control apparatus 10 in Embodiment 2 is the same as that of Embodiment 1, detailed description is abbreviate | omitted.

図６は、実施の形態２における充電制御装置１０の処理の手順を示すフローチャートである。
図６のフローチャートにおいて、充電制御装置１０は、電動車２０が停車されキーオフ状態となるまで待機する（ステップＳ６０２：Ｎｏのループ）。電動車２０がキーオフ状態となると（ステップＳ６０２：Ｙｅｓ）、外気温センサ２１４により検出された電動車２０周辺の外気温を取得するとともに（ステップＳ６０４）、バッテリ温度センサ２１０により検出された走行用バッテリ２０２のバッテリ温度を取得する（ステップＳ６０６）。また、ＧＰＳセンサ２１２によって特定された電動車２０の現在位置を取得する（ステップＳ６０８）。なお、電動車２０周辺の外気温およびバッテリ温度の検出は、キーオン状態時にも継続しておこなっている。また、この時点でバッテリ温度等に異常があった場合は、充電をおこなわないように運転者等に対して報知する。 FIG. 6 is a flowchart illustrating a processing procedure of the charging control apparatus 10 according to the second embodiment.
In the flowchart of FIG. 6, the charging control device 10 stands by until the electric vehicle 20 stops and enters a key-off state (step S602: No loop). When the electric vehicle 20 enters the key-off state (step S602: Yes), the outside air temperature around the electric vehicle 20 detected by the outside air temperature sensor 214 is acquired (step S604), and the running battery detected by the battery temperature sensor 210 is acquired. The battery temperature of 202 is acquired (step S606). Further, the current position of the electric vehicle 20 specified by the GPS sensor 212 is acquired (step S608). The detection of the outside air temperature and the battery temperature around the electric vehicle 20 is continuously performed even in the key-on state. Further, if there is an abnormality in the battery temperature or the like at this time, the driver or the like is notified so as not to perform charging.

充電制御装置１０は、車両側コネクタ２０６に充電装置側コネクタ３０２が接続されて外部電源を用いた外部充電が開始されると（ステップＳ６１０：Ｙｅｓ）、充電完了時刻推定手段１０２は、走行用バッテリ２０２が満充電状態となる充電完了時刻を推定する（ステップＳ６１２）。また、予測値取得手段１０４は、現在時刻から充電完了時刻までの外気温の変化予測値を温度情報データベース２２０から読み出す（ステップＳ６１４）。そして、外気温推定手段１０６は、充電完了時刻における電動車２０の現在位置周辺の推定外気温を推定する（ステップＳ６１６）。なお、ステップＳ６１０において、外部充電が開始されない場合には（ステップＳ６１０：Ｎｏ）、ステップＳ６０２に戻り、外気温などを検出しながら待機する。   When the charging device side connector 302 is connected to the vehicle side connector 206 and external charging using an external power supply is started (step S610: Yes), the charging control device 10 determines that the charging completion time estimation means 102 is a traveling battery. The charging completion time at which 202 is fully charged is estimated (step S612). Moreover, the predicted value acquisition means 104 reads the predicted change value of the outside air temperature from the current time to the charging completion time from the temperature information database 220 (step S614). Then, the outside air temperature estimating means 106 estimates the estimated outside air temperature around the current position of the electric vehicle 20 at the charging completion time (step S616). If external charging is not started in step S610 (step S610: No), the process returns to step S602 and waits while detecting the outside air temperature and the like.

充電制御手段１０８は、ステップＳ６１６で推定した推定外気温が所定温度以上か否かを判断する（ステップＳ６１８）。推定外気温が所定温度以上の場合（ステップＳ６１８：Ｙｅｓ）、充電制御手段１０８は、充電目標ＳＯＣを９５％に設定する（ステップＳ６２０）。すなわち、走行用バッテリ２０２が満充電状態となるよりも充電を早く終了させるようにする。一方、推定外気温が所定温度未満の場合（ステップＳ６１８：Ｎｏ）、充電制御手段１０８は、充電目標ＳＯＣを１００％に設定する（ステップＳ６２２）。すなわち、走行用バッテリ２０２が満充電状態となるまで充電を継続させる。   The charging control unit 108 determines whether or not the estimated outside air temperature estimated in step S616 is equal to or higher than a predetermined temperature (step S618). When the estimated outside air temperature is equal to or higher than the predetermined temperature (step S618: Yes), the charging control unit 108 sets the charging target SOC to 95% (step S620). That is, charging is terminated earlier than the traveling battery 202 is fully charged. On the other hand, when the estimated outside air temperature is lower than the predetermined temperature (step S618: No), the charging control unit 108 sets the charging target SOC to 100% (step S622). That is, the charging is continued until the traveling battery 202 is fully charged.

充電制御手段１０８は、走行用バッテリ２０２のＳＯＣが充電目標ＳＯＣ以上になるまでは（ステップＳ６２４：Ｎｏ）、充電を継続させる（ステップＳ６２６）。そして、走行用バッテリ２０２のＳＯＣが充電目標ＳＯＣ以上になると（ステップＳ６２４：Ｙｅｓ）、走行用バッテリ２０２への充電を終了させ（ステップＳ６２８）、本フローチャートの処理を終了する。   The charging control unit 108 continues the charging until the SOC of the traveling battery 202 becomes equal to or higher than the charging target SOC (step S624: No) (step S626). When the SOC of the traveling battery 202 becomes equal to or higher than the charging target SOC (step S624: Yes), the charging of the traveling battery 202 is terminated (step S628), and the processing of this flowchart is terminated.

以上説明したように、実施の形態２にかかる充電制御装置１０は、充電開始時に充電完了時刻の推定や抑制充電をおこなうか否かの判断等をおこなうので、ユーザが充電開始時に充電所要時間や抑制充電をおこなうか否かを把握することができる。   As described above, the charging control apparatus 10 according to the second embodiment estimates the charging completion time at the start of charging, determines whether to perform suppression charging, and the like. It is possible to grasp whether or not to perform suppressed charging.

１０……充電制御装置、２０……電動車、３０……外部充電装置、１０２……充電完了時刻推定手段、１０４……予測値取得手段、１０６……外気温推定手段、１０８……充電制御手段、２０２……走行用バッテリ、２０４……モータ、２０６……車両側コネクタ、２０８……充電器、２１０……バッテリ温度センサ、２１２……ＧＰＳセンサ、２１４……外気温センサ、２１６……高度計、２１８……カレンダー、２２０……温度情報データベース（記憶手段）、３０２……充電装置側コネクタ。   DESCRIPTION OF SYMBOLS 10 ... Charge control apparatus, 20 ... Electric vehicle, 30 ... External charging apparatus, 102 ... Charging completion time estimation means, 104 ... Predicted value acquisition means, 106 ... Outside temperature estimation means, 108 ... Charge control Means 202... Battery for driving, 204... Motor, 206... Vehicle side connector, 208... Battery charger, 210 ... Battery temperature sensor, 212 ... GPS sensor, 214 ... Outside temperature sensor, 216. Altimeter, 218... Calendar, 220... Temperature information database (storage means), 302.

Claims (7)

外部電源を用いた電動車のバッテリへの充電を制御する充電制御装置であって、
前記バッテリが満充電状態となる充電完了時刻を推定する充電完了時刻推定手段と、
前記電動車の現在位置周辺における外気温の変化予測値を取得する予測値取得手段と、
前記充電完了時刻推定手段によって推定された充電完了時刻と、前記予測値取得手段によって取得された変化予測値に基づいて、前記充電完了時刻における前記電動車の現在位置周辺の外気温である推定外気温を推定する外気温推定手段と、
前記外気温推定手段によって推定された前記推定外気温に基づいて、前記バッテリの充電終了時機を決定する充電制御手段と、を備え、
前記充電制御手段は、前記推定外気温が所定温度以上の場合、前記電動車への充電を前記バッテリが満充電状態となるよりも早く終了させ、前記推定外気温が所定温度未満の場合、前記バッテリが満充電状態となるまで前記電動車への充電を継続させる、
ことを特徴とする充電制御装置。 A charge control device for controlling charging of an electric vehicle battery using an external power source,
Charging completion time estimating means for estimating a charging completion time at which the battery is fully charged;
Predicted value acquisition means for acquiring a predicted change value of the outside air temperature around the current position of the electric vehicle;
Based on the charge completion time estimated by the charge completion time estimation means and the predicted change value acquired by the prediction value acquisition means, the estimated outside temperature around the current position of the electric vehicle at the charge completion time is not estimated. An outside temperature estimating means for estimating the temperature;
Charging control means for determining when to end charging of the battery based on the estimated outside air temperature estimated by the outside air temperature estimating means,
When the estimated outside air temperature is equal to or higher than a predetermined temperature, the charging control unit terminates the charging of the electric vehicle earlier than the battery is fully charged, and when the estimated outside air temperature is lower than the predetermined temperature, Continue charging the electric vehicle until the battery is fully charged,
The charge control apparatus characterized by the above-mentioned. 前記充電制御手段は、前記推定外気温が所定温度以上の場合には前記バッテリの充電率が１００％よりも小さい第１の所定値になると充電を終了させ、
前記充電完了時刻推定手段は、前記充電率が前記第１の所定値以下である第２の所定値となった際に前記充電完了時刻を推定し、
前記外気温推定手段は、前記充電率が前記第２の所定値となった際に前記推定外気温を推定し、
前記充電制御手段は、前記充電率が前記第２の所定値となった際に前記充電終了時機を決定する、
ことを特徴とする請求項１に記載の充電制御装置。 The charging control means terminates charging when the estimated outside air temperature is equal to or higher than a predetermined temperature when the charging rate of the battery reaches a first predetermined value smaller than 100%,
The charging completion time estimating means estimates the charging completion time when the charging rate becomes a second predetermined value that is equal to or less than the first predetermined value,
The outside air temperature estimating means estimates the estimated outside air temperature when the charging rate becomes the second predetermined value,
The charging control means determines the charging end timing when the charging rate reaches the second predetermined value;
The charge control device according to claim 1, wherein 前記充電完了時刻推定手段は、前記バッテリへの充電の開始時に前記充電完了時刻を推定し、
前記外気温推定手段は、前記バッテリへの充電の開始時に前記推定外気温を推定し、
前記充電制御手段は、前記バッテリへの充電の開始時に前記充電終了時機を決定する、
ことを特徴とする請求項１に記載の充電制御装置。 The charging completion time estimation means estimates the charging completion time at the start of charging the battery,
The outside air temperature estimating means estimates the estimated outside air temperature at the start of charging the battery,
The charging control means determines the charging end time at the start of charging the battery;
The charge control device according to claim 1, wherein 気象観測地点において過去に観測された所定時間毎の外気温の平均値を記憶する記憶手段をさらに備え、
前記予測値取得手段は、ＧＰＳセンサを用いて前記電動車の現在位置を特定し、前記現在位置に最も近い前記気象観測地点における前記平均値を前記記憶手段から取得する、
ことを特徴とする請求項１から３のいずれか１つに記載の充電制御装置。 A storage means for storing an average value of the outside air temperature for each predetermined time observed in the past at the weather observation point;
The predicted value acquisition means specifies a current position of the electric vehicle using a GPS sensor, and acquires the average value at the weather observation point closest to the current position from the storage means.
The charge control device according to claim 1, wherein the charge control device is a charge control device. 前記外気温推定手段は、前記電動車の現在位置の標高を特定し、前記現在位置に最も近い前記気象観測地点との標高差に基づいて前記平均値を補正して前記推定外気温を推定する、
ことを特徴とする請求項４に記載の充電制御装置。 The outside air temperature estimating means specifies the altitude of the current position of the electric vehicle, corrects the average value based on an altitude difference from the weather observation point closest to the current position, and estimates the estimated outside air temperature. ,
The charge control apparatus according to claim 4, wherein 前記電動車の現在位置を含む地域の天気予報データを受信する受信手段をさらに備え、
前記予測値取得手段は、ＧＰＳセンサを用いて前記電動車の現在位置を特定し、前記変化予測値としての前記天気予報データを前記受信手段を介して取得する、
ことを特徴とする請求項１から３のいずれか１つに記載の充電制御装置。 Receiving means for receiving local weather forecast data including the current position of the electric vehicle;
The predicted value acquisition means specifies a current position of the electric vehicle using a GPS sensor, and acquires the weather forecast data as the change predicted value via the receiving means.
The charge control device according to claim 1, wherein the charge control device is a charge control device. 前記電動車周辺の外気温を測定する外気温センサをさらに備え、
前記外気温推定手段は、前記外気温センサによって測定された前記電動車周辺の外気温に基づいて前記変化予測値を補正して前記推定外気温を推定する、
ことを特徴とする請求項１から６のいずれか一つに記載の充電制御装置。 An outside air temperature sensor for measuring outside air temperature around the electric vehicle;
The outside air temperature estimating means corrects the change predicted value based on the outside air temperature around the electric vehicle measured by the outside air temperature sensor, and estimates the estimated outside air temperature.
The charge control device according to any one of claims 1 to 6, wherein
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