JP2018042392A - Power receiving device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively control a power supply amount from a power supply unit with respect to the drive power of a vehicle in response to transmission efficiency between the power supply unit and a power receiving unit.SOLUTION: A power receiving device for a vehicle comprises: a power receiving unit 11 for receiving power from a power supply unit F which is installed outside a vehicle 1; necessary drive power amount calculation means 12 for calculating a necessary drive power amount X according to a drive state of the vehicle 1; and required power supply amount calculation means 13 for calculating a required power supply amount Z to the power receiving unit 11 on the basis of the necessary drive power amount X. When the necessary drive power amount X exceeds a preset first prescribed power amount α, the required power supply amount calculation means 13 performs second control for setting the required power supply amount Z small with respect to the necessary drive power amount X, and when the necessary drive power amount X goes below a second prescribed power amount β which is set to a value smaller than the first prescribed power amount α, setting the required power supply amount Z large with respect to the necessary drive power amount X.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle power receiving device provided on a vehicle side for receiving power for traveling from a power supply unit provided outside the vehicle.

    In recent years, research and development of technology for receiving electric power from a power supply unit provided on the outside of a vehicle, for example, on a road surface or a side wall, and traveling the vehicle with the received electric power have been advanced. In the future, it is expected that power supply during running of electric vehicles and plug-in hybrid vehicles will be put into practical use.

    The power supply during traveling has advantages and disadvantages in terms of convenience in power transmission, transmission efficiency, cost, and the like, compared with normal power supply (charging) while parking. For this reason, when power is supplied during traveling, it is necessary to take advantage of the merit and control well to reduce the demerit.

  For example, in Patent Document 1, a motor torque is determined in accordance with the accelerator pedal depression amount (required torque) of the driver and the vehicle speed, and is supplied from a plurality of batteries provided in the vehicle corresponding to the motor torque. And distribution of power supplied from an external power supply unit is determined. Thus, the amount of power supplied from the external power supply unit can be set to an appropriate amount (see paragraphs 0074 to 0077 of FIG. 7 and FIG. 7).

JP 2009-296848 A

  Vehicle power receiving devices that support power supply during traveling include a wireless power transmission method that receives power from an external power supply unit in a wireless manner, and a wired power transmission method that receives power in a wired manner.

  In general, in the wired power transmission system, the transmission efficiency at the time of power transmission decreases as the feed power increases. That is, power loss (current × current × resistance) during power transmission increases, and power supply efficiency tends to decrease due to the power loss.

  In this regard, in the invention described in Patent Document 1, no consideration is given to the power feeding efficiency between the power feeding unit provided outside and the vehicle power receiving device provided on the vehicle side. For this reason, it can be said that the merit and demerit of the electric power supply during driving are not properly used.

  Therefore, an object of the present invention is to efficiently control the amount of power supplied from the power supply unit to the driving power of the vehicle in correspondence with the transmission efficiency between the power supply unit and the power reception unit.

  In order to solve the above-described problems, the present invention provides a power receiving unit that receives power from a power feeding unit installed outside the vehicle, and a required driving power amount calculation that calculates a required driving power amount according to the driving state of the vehicle. And a required power supply amount calculating means for calculating a required power supply amount to the power receiving unit based on the required drive power amount, wherein the required power supply amount calculating means is based on the required drive power amount. Thus, a vehicle power receiving device that sets a ratio of the required power supply amount to the required drive power amount is employed.

  Here, the required power supply amount calculating means sets the required power supply amount to be smaller than the required drive power amount when the required drive power amount exceeds a preset first predetermined power amount. The structure which performs can be employ | adopted.

  In addition to or instead of the first control, the required power supply power amount calculation means requests the required drive power amount when the required drive power amount is lower than a preset second predetermined power amount. It is possible to employ a configuration in which the second control for setting the amount of power supply to be large is performed.

  In the case where the first control is performed, the battery includes a battery for supplying driving power to the vehicle, and the required power supply amount calculation unit is configured so that the charge amount of the battery exceeds a preset first predetermined charge rate. Only the configuration for performing the first control can be employed.

  In addition, when performing the second control, a battery that supplies driving power to the vehicle is provided, and the requested power supply amount calculation unit is configured such that a charge amount of the battery is lower than a second predetermined charge rate that is set in advance. A configuration in which the second control is performed only in such a case can be employed.

  Here, in the first control, the required power supply amount calculation means employs a configuration in which the required power supply amount is set small within a range in which the required drive power amount does not become less than a preset first predetermined power amount. be able to.

  Further, the required power supply amount calculation means adopts a configuration in which the required power supply amount is set large in a range in which the required drive power amount does not exceed a preset second predetermined power amount in the second control. Can do.

  In the present invention, since the ratio of the required power supply amount to the required drive power amount is set according to the required drive power amount according to the driving state of the vehicle, power supply between the power supply unit and the power reception unit is performed. The accompanying power loss can be minimized. That is, the amount of power supplied from the power supply unit for the driving power of the vehicle can be efficiently controlled according to the transmission efficiency.

Schematic which shows an example of the vehicle provided with the power receiving apparatus for vehicles which concerns on this invention Schematic showing how power is supplied from the power supply unit to the vehicle in a wired manner Graph showing the relationship between drive power (required drive power) and transmission efficiency The graph which shows the case where request | requirement electric power (required electric power supply amount) is correct | amended with respect to drive electric power (required drive electric energy) The graph which shows the case where request | requirement electric power (required electric power supply amount) is correct | amended with respect to drive electric power (required drive electric energy) A flowchart showing an example of a flow for determining required power (required power supply amount)

  FIG. 1 shows a schematic diagram of a vehicle 1 including a vehicle power receiving device 10 according to the present invention. Here, an electric vehicle is illustrated as the vehicle 1, but the vehicle power receiving device 10 is provided outside the vehicle 1, such as a plug-in hybrid vehicle equipped with an engine, in addition to the electric vehicle. The present invention can be widely applied to all types of vehicles 1 that drive the motor 21 with the power supplied from the power supply unit F (see FIG. 2) or the power charged in the battery 20.

  As shown in FIG. 1, the vehicle 1 includes a vehicle power receiving device 10 (hereinafter simply referred to as a power receiving device 10) that receives power from an external power supply unit F, a battery 20, a motor 21, wheels 22, an alternating current. / DC converter 23, DC / DC converter 24, inverter 25, etc. are provided. Further, although the motor 21 and the like are provided on the front wheel side and the rear wheel side of the vehicle 1, all the wheels 22 may be driven by a single motor 21.

  The battery 20 functions as one of drive power sources that supplies power for driving the motor 21 together with power supplied from the external power supply unit F.

  As shown in FIG. 2, the exchange of electric power between the power supply unit F and the power receiving apparatus 10 is performed by a contact type wired system. In this wired power supply, the power supply unit F includes, for example, a long contact member such as a power transmission line or a power transmission rail on the ground side, and the power receiving device 10 includes a contact such as a power transmission arm L made of a conductor. Power is sent from the power supply unit F to the power receiving device 10 through these contacts and contact members.

  Since the contact member of the power supply unit F is provided continuously or intermittently along the traveling direction of the road, when the contactor contacts the contact member, the power supply unit F and the vehicle power receiving device 10 Power is supplied while the power is on.

  The electric power supplied from the power supply unit F to the power receiving device 10 is sent to the motor 21 via the AC / DC converter 23, the DC / DC converter 24 and the inverter 25. In some cases, the DC / DC converter 24 may be omitted.

  In addition, the AC / DC converter 23 between the power receiving device 10 and the battery 20 can charge the battery 20 by converting the power supplied from the power supply unit F to the power receiving device 10 as an AC current into a DC current. . Note that, when a direct current is supplied from the power supply unit F to the power receiving device 10, the AC / DC converter 23 can be omitted.

  The power receiving device 10 receives power from the power supply unit F, and calculates the necessary drive power amount X according to the driving state of the vehicle 1 in addition to the power receiving unit 11 that sends the received power to the motor 21 and the battery 20. A required drive power amount calculating means 12 and a required power supply power amount calculating means 13 for calculating a required power supply power amount Z to the power receiving unit 11 based on the required drive power amount X are provided.

  The required drive power amount calculation means 12 and the required power supply power amount calculation means 13 can be provided in an electronic control unit that controls the overall functions of the vehicle 1 or in a computer or the like separate from the electronic control unit. .

  The required drive power amount calculation means 12 calculates the required drive power amount X required for traveling of the vehicle 1 based on the power actually supplied to the motor 21 or information from the motor 21 and peripheral devices. Can do. The required power supply amount calculation means 13 is configured to set the ratio of the required power supply amount Z to the required drive power amount X based on the required drive power amount X necessary for traveling of the vehicle 1. Here, the required power supply amount Z ÷ the required drive power amount X = the correction coefficient Y, and the correction coefficient Y is set according to the conditions.

  For example, as shown in FIG. 3, the required drive power amount X varies with the passage of time shown on the horizontal axis. Here, the operation region in the vicinity indicated by the symbol A in the graph of FIG. 3 is a transmission efficiency decrease region A in which the required drive power amount X is relatively large, power loss during power transmission increases, and transmission efficiency decreases. is there. On the other hand, the driving region in the vicinity indicated by the symbol B is a transmission efficiency improving region B in which the required drive power amount X is relatively small, the power loss during power transmission is reduced, and the transmission efficiency is improved.

  In general, the required drive power amount X varies depending on the amount of depression of the accelerator pedal during traveling. Since the required power supply amount Z is set larger as the required drive power amount X is larger, the transmission efficiency tends to deteriorate as the amount of power supplied increases.

  When requesting power supply, normally, the required power supply amount Z is set equal to or greater than the required drive power amount X. However, when the amount of power to be supplied is less than the required drive power amount X, the power from the battery 20 is used for driving the motor 21 and the like.

  Therefore, when receiving power from the power supply unit F, as shown in FIG. 4, the required power supply power amount calculation means 13 takes into account the transmission efficiency and the first predetermined power in which the required drive power amount X is preset. When the amount α is exceeded, the first control for setting the required power supply power amount Z to be smaller than the required drive power amount X is performed. At this time, it is preferable that the required power supply amount Z is set in a range that does not become less than the first predetermined power amount α.

  Further, the required power supply amount calculation means 13 determines the required drive power amount X when the required drive power amount X is lower than the second predetermined power amount β set to a value lower than the first predetermined power amount α. Second control for setting the required power supply amount Z large is performed. At this time, it is preferable that the required power supply amount Z is set in a range not exceeding the second predetermined power amount β.

  That is, in the transmission efficiency lowering area A where the transmission efficiency is poor, the first control is performed and power is supplied to less eyes than usual, and in the transmission efficiency improving area B where the transmission efficiency is good, the second control is performed and more eyes than usual. Supply power. It is desirable that both the first control and the second control are executed in the corresponding operation region. However, depending on the specifications and applications of the vehicle 1, only the first control is necessary. Alternatively, only the second control may be executed in each corresponding operation region.

  However, when there is no allowance for the charge amount of the battery 20, that is, the ratio of the amount of electricity that is charged at that time to the battery capacity (State of charge), that is, the charge rate for the fully charged state of the battery 20 is If the required drive power amount X is less than the predetermined ratio, it is not necessary to forcibly reduce the required power supply amount Z in a large power range where the required drive power amount X is relatively large. May be good. For this reason, the first control for suppressing the required power supply power amount Z is performed only when the charge amount of the battery exceeds a preset first predetermined charge rate and there is a margin in the charge amount. Good.

  Further, when there is a margin in the charge amount of the battery 20, that is, the ratio of the amount of electricity charged at that time to the battery capacity (State of charge), that is, the charge rate with respect to the fully charged state of the battery 20 When the predetermined ratio is exceeded, it is considered unnecessary to increase the required power supply amount Z forcibly in a small power range where the required drive power amount X is relatively small. Therefore, the second control for increasing the required power supply amount Z is set to be performed only when the charge amount of the battery 20 falls below a preset second predetermined charge rate and there is no allowance for the charge amount. You may be made to do.

  Here, the full charge rate of the battery 20 (for example, 100%)> first predetermined charge rate> second predetermined charge rate> battery use limit charge rate (for example, 0%).

  Instead of the control of FIG. 4, the control shown in FIG. 5 may be adopted. In the control of FIG. 5, the second predetermined power amount β and the first predetermined power amount α are set to γ that is the same value. That is, the first predetermined power amount γ is employed as the reference power amount for performing the first control, and the second predetermined power amount γ is employed as the reference power amount for performing the second control.

  In the control shown in FIG. 5, in consideration of transmission efficiency, the required power supply power amount calculation means 13 sets the required drive power amount X when the required drive power amount X exceeds a preset first predetermined power amount γ. On the other hand, the first control for setting the required power supply amount Z small is performed. The required power supply amount calculation means 13 requests the required drive power amount X when the required drive power amount X is lower than the second predetermined power amount γ set to the same value as the first predetermined power amount γ. Second control is performed to set the power supply amount Z large.

In each of these embodiments, the ratio of the required power supply amount Z to the required drive power amount X in the first control, that is, the above-described correction coefficient Y may be set to increase or decrease according to the required drive power amount X. Good. For example, when the required drive power amount X exceeds the first predetermined power amounts α and γ, the larger the required drive power amount X, the smaller the ratio of the required feed power amount Z to the required drive power amount X, and the required drive. As the power amount X is smaller, the ratio of the required power supply amount Z to the required drive power amount X can be set larger.

  For example, as shown in the leftmost part of FIG. 5, when the required drive power amount P1 is reached, the required drive power with respect to the ratio P1 ′ / P1 (<1) of the required feed power amount P1 ′ with respect to the required drive power amount P1. The ratio P2 ′ / P2 (<1) of the required power supply amount P2 ′ with respect to the required drive power amount P2 in the case of the power amount P2 can be set large. Here, P1> P2, and (P1 ′ / P1) <(P2 ′ / P2).

  Similarly, the ratio of the required power supply amount Z to the required drive power amount X in the second control, that is, the correction coefficient Y may be set to increase or decrease according to the required drive power amount X. For example, when the required drive power amount X is lower than the second predetermined power amounts β and γ, the smaller the required drive power amount X is, the larger the ratio of the required feed power amount Z to the required drive power amount X is. As the power amount X is larger, the ratio of the required power supply power amount Z to the required drive power amount X can be set smaller.

  For example, as shown in the right side portion of FIG. 5, when the required drive power amount P3 is reached, the required drive power with respect to the ratio P3 ′ / P3 (> 1) of the required feed power amount P3 ′ with respect to the required drive power amount P3. The ratio P4 ′ / P4 (> 1) of the required power supply amount P4 ′ with respect to the required drive power amount P4 in the case of the power amount P4 can be set small. Here, P3 <P4 and (P3 '/ P3)> (P4' / P4).

  When the power supply amount is set in consideration of the charge amount of the battery 20, the required power supply power amount calculation means 13 is a type of the vehicle 1, for example, the vehicle 1 is an electric vehicle or a plug-in hybrid vehicle. Depending on how, the setting condition of the required power supply amount may be changed.

For example, when the vehicle 1 is an electric vehicle not equipped with an engine, it is desirable to maintain the charge amount of the battery 20 higher than that of a plug-in hybrid vehicle equipped with an engine. An electric vehicle cannot run on the spot if the amount of charge of the battery 20 is insufficient, whereas a plug-in hybrid vehicle continues to run with the driving force of the engine even if the amount of charge of the battery 20 is insufficient. Because it is possible. For this reason, in the case of an electric vehicle under the same vehicle conditions and the same driving conditions except for the difference in whether or not the engine is mounted, the required power supply electric energy for the required drive electric energy X is greater than in the case of a plug-in hybrid vehicle. It is desirable to set the Z ratio high.

  Further, as described above, when the amount of power to be fed is less than the required drive power amount X, the vehicle 1 cannot be driven only by the power supplied from the power feeding unit F. For this reason, the insufficient amount of electric power is supplied from the battery 20. The instruction to supply the insufficient power amount from the battery 20 is such that the control means included in the power receiving device 10 requires the required drive power amount X and the required supply power amount from the required drive power amount calculation means 12 and the required supply power amount calculation means 13. This can be done based on information such as Z.

  An example of control by the power receiving apparatus 10 will be described based on the flowchart of FIG.

  In step S1, control is started. In step S2, the required drive power amount X is calculated, and it is determined whether the required drive power amount X exceeds the first predetermined power amount α (or the first predetermined power amount γ).

  If the required drive power amount X exceeds the first predetermined power amount α, the process proceeds to step S8. In step S8, the first control is performed in which the correction coefficient Y, which is the ratio of the required power supply amount Z to the required drive power amount X, is set to less than 1, and the required power supply amount Z is lower than the required drive power amount X. It can be suppressed.

  If the required drive power amount X does not exceed the first predetermined power amount α, the process proceeds to step S3. In step S3, it is determined whether or not the required drive power amount X is less than the second predetermined power amount β (or may be the second predetermined power amount γ).

  If the required drive power amount X is not less than the second predetermined power amount β, the process proceeds to step S6. In step S6, the correction coefficient Y, which is the ratio of the required power supply amount Z to the required drive power amount X, is set to 1, and the required power supply power amount Z is set equal to the required drive power amount X.

  If the required drive power amount X is less than the second predetermined power amount β, the process proceeds to step S4. In step S4, it is determined whether or not the state of charge of the battery 20 exceeds the first predetermined charging rate C (%).

  If the state of charge of the battery 20 exceeds the first predetermined charging rate C (%), the process proceeds to step S5. In step S5, the correction coefficient Y, which is the ratio of the required power supply amount Z to the required drive power amount X, is set to 1, and the required power supply amount Z is set equal to the required drive power amount X.

  If the state of charge of the battery 20 does not exceed the first predetermined charging rate C (%), the process proceeds to step S7. In step S7, the correction coefficient Y, which is the ratio of the required power supply amount Z to the required drive power amount X, is set to be greater than 1, and the required power supply power amount Z is set to be higher than the required drive power amount X.

  That is, the required power supply amount Z is calculated by multiplying the required drive power amount X by the correction coefficient Y. When the setting of the required power supply amount Z is completed, power supply based on the required power supply amount Z is started. The process returns from step S9 to step S1, and the same control is repeated.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Vehicle power receiving apparatus 11 Power receiving unit 12 Required drive electric energy calculation means 13 Required electric power supply calculation means 20 Battery 21 Motor 22 Wheel 23 AC / DC converter 24 DC / DC converter 25 Inverter L Power transmission arm F Power supply unit

Claims (7)

A power receiving unit that receives power from a power supply unit installed outside the vehicle;
A required drive power amount calculating means for calculating a required drive power amount according to the driving state of the vehicle;
A required power supply amount calculation means for calculating a required power supply amount to the power receiving unit based on the required drive power amount;
With
The required power supply amount calculation unit is a vehicle power receiving device that sets a ratio of the required power supply amount to the required drive power amount based on the required drive power amount. The required power supply amount calculation means performs a first control for setting a required power supply amount to be smaller than the required drive power amount when the required drive power amount exceeds a preset first predetermined power amount. Item 14. The vehicle power receiving device according to Item 1. The required power supply amount calculation means performs second control for setting the required power supply amount to be larger than the required drive power amount when the required drive power amount is lower than a preset second predetermined power amount. Item 3. The vehicle power receiving device according to Item 1 or 2. A battery for supplying driving power to the vehicle;
The vehicle power receiving device according to claim 2, wherein the requested power supply amount calculation unit performs the first control only when a charge amount of the battery exceeds a preset first predetermined charge rate. A battery for supplying driving power to the vehicle;
4. The vehicle power receiving device according to claim 3, wherein the required power supply amount calculation unit performs the second control only when a charge amount of the battery is lower than a second predetermined charge rate set in advance. 5. The vehicle according to claim 2, wherein the required power supply amount calculation means sets the required power supply amount small in the first control in a range where the required drive power amount does not become less than a preset first predetermined power amount. Power receiving device. The vehicle according to claim 3, wherein the required power supply amount calculation means sets the required power supply amount large in a range in which the required drive power amount does not exceed a preset second predetermined power amount in the second control. Power receiving device.

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