JP2012034506A - Charging system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging system for a vehicle, capable of attaining power saving by surely performing charging start control and end control even for a different standby current value depending on a vehicle and preventing consumption of the standby current.SOLUTION: A charging system comprises a charging unit 6 including: a control section 7; a plug socket 9 to which power is supplied from a power source trunk line 13 and a power plug 8 of a vehicle 1 parked in a garage is connected; and a current sensor 15 for measuring a current value applied to the plug socket 9. The control section 7 sets a standby current value detected by the current sensor 15 at starting power supply as a threshold value and controls charging to be ended by determining completion of charging when the current value during the charging becomes less than the threshold value.

Description

  The present invention relates to a vehicular charging system, and more particularly to a vehicular charging system that can reliably perform charge start control and end control even when a standby current value varies depending on the vehicle.

  In recent years, electric vehicles have become widespread, and charging systems for electric vehicles have been developed. In such a charging system, a plurality of vehicles are charged when an electric vehicle is parked in a parking lot.

  Here, when charging a plurality of batteries, a technique is disclosed in which the charging capacity and the like are displayed based on the current value information when power is initially supplied (for example, Patent Document 1).

JP 2002-238178 A

  However, in the technique described in Patent Document 1, the object to be charged is a technique for a relatively small-capacity battery such as a portable video camera. For example, the vehicle is equipped with a large-capacity battery such as an electric vehicle. On the other hand, it is difficult to apply.

  On the other hand, as a means for charging the vehicle, household charging using a general household power source and rapid charging can be considered. However, rapid charging has a problem that although the charging time is short, the equipment becomes large and the equipment cost becomes high. In addition, home charging can be performed with general commercial power, but has a problem that charging takes time. In addition, by preparing multiple outlets, it is possible to charge multiple vehicles, but in order to handle multiple small amounts, a large amount of total power is required, and thick wires are used. There is a problem that it is necessary and the facility construction becomes large-scale.

  In addition, when charging the vehicle, the current value flowing through the outlet is detected, and when power supply is started, when the current value becomes 0, it is determined that charging is completed and charging is terminated. It is possible to determine the end of charging, but the standby current with a current value lower than the charging current is between the start of power supply and the start of charging and after the charging is completed. May flow. Therefore, when the current value becomes 0, the control that determines that the charging is completed has a problem that standby current is consumed and power is wasted.

  Therefore, it is possible to set a certain threshold value for the current value, and when the current value becomes lower than this threshold value, it can be determined that the charging is completed and the charging is terminated. Since the value varies depending on the type of vehicle and manufacturer, depending on the type of vehicle, the standby current value may become higher than the threshold value due to the setting of the threshold value. Have the problem of

  The present invention has been made in view of the above points, and even when the standby current value varies depending on the vehicle, the charging start control and end control can be reliably performed, and standby current consumption is prevented and saved. It is an object of the present invention to provide a vehicle charging system that can be powered.

In order to achieve the above object, the vehicle charging system according to the invention of claim 1 includes a plurality of vehicle compartments installed in a parking lot where an electric vehicle can be parked,
A power supply trunk line supplied with power from an external power source;
A control unit, a power receiving side connector connected to a power receiving side connector of a vehicle parked in the passenger compartment, and power is supplied from the power supply main line; a current sensor that measures a current value flowing through the power feeding side connector; A charging unit with
The control unit sets a standby current value detected at the start of power supply by the current sensor as a threshold value, and determines that charging is completed when the current value during charging becomes lower than the threshold value. It is characterized by controlling to finish.

  According to a second aspect of the present invention, in the first aspect, the charging unit includes a timer for measuring a charging time after the threshold value is exceeded, and the control unit has a constant charging time by the timer. Control is made so that charging is terminated when time elapses.

  According to a third aspect of the present invention, in the second aspect of the present invention, the timer measures a monitoring time of a predetermined time after the start of power feeding, and the control unit has a current value during the monitoring time. When the threshold value is not exceeded, the charging is controlled to end.

According to a fourth aspect of the present invention, in any one of the first to third aspects, when the current value exceeds the threshold value after the standby current flows after the power supply is started, a predetermined time period is reached. A charge start determination timer for starting the measurement of a charge end, and a charge end determination timer for starting the measurement for a predetermined time when the current value is equal to or less than the threshold value from the state where the charge current is flowing. ,
The control unit determines that charging is started when a charging current is flowing when a current value exceeds a threshold value and measurement by the charging start determination timer is started and a predetermined time has elapsed. At the same time, when the current value becomes equal to or less than the threshold value and measurement by the charge end determination timer is started and a predetermined time has passed and the standby current is flowing, it is determined that the charge has ended. Features.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the charging unit includes a voltage detection unit that detects a voltage value to be supplied.

  According to the first aspect of the present invention, the control unit sets the standby current value detected at the start of power supply by the current sensor as a threshold value, and charging is performed when the current value during charging becomes lower than the threshold value. Since it is determined that the charging is completed and the charging is terminated, the charging can be reliably terminated even when the standby current value varies depending on the vehicle. As a result, it is possible to prevent standby current from being consumed during charging, and to save power.

  According to the second aspect of the present invention, the control unit controls the charging to end when the charging time by the timer elapses for a fixed time. Even when it is not lower, charging can be completed in a certain time.

  According to the invention of claim 3, since the control unit controls the charging to be terminated when the current value does not exceed the threshold value during the monitoring time, for example, the fully charged state has already been reached. In the case where charging is unnecessary, charging can be properly terminated.

  According to the invention according to claim 4, when the control unit starts the measurement by the charge start determination timer when the current value exceeds the threshold value, and the charging current flows when a certain time has elapsed, It is determined that charging has started, and when the current value falls below the threshold value and measurement by the charging end determination timer is started, and when a certain period of time has elapsed, charging has ended when standby current is flowing Therefore, even when a noise current flows in a state where a standby current or a charging current is flowing, it is possible to appropriately determine the start or end of charging.

  According to the invention of claim 5, since the voltage detection unit for detecting the supplied voltage value is provided in the charging unit, the connection failure is detected by detecting the voltage value supplied by the voltage detection unit. It is possible to detect abnormalities such as short circuit and short circuit and electric leakage.

1 is a schematic configuration diagram showing a first embodiment of a vehicle charging system according to the present invention. It is explanatory drawing which shows the change of the charging current in 1st Embodiment of the charging system for vehicles which concerns on this invention. It is explanatory drawing which shows the change of the other charging current in 1st Embodiment of the charging system for vehicles which concerns on this invention. It is a flowchart which shows the charging operation in 1st Embodiment of the charging system for vehicles which concerns on this invention. It is a flowchart which shows the electric power feeding operation | movement in 1st Embodiment of the charging system for vehicles which concerns on this invention. It is a schematic block diagram which shows 2nd Embodiment of the charging system for vehicles which concerns on this invention. It is explanatory drawing which shows the example in the case of complete | finishing charge, without starting charge by noise current in 2nd Embodiment of the charging system for vehicles which concerns on this invention. It is explanatory drawing which shows the example in the case of complete | finishing charge in the middle of the charge by the noise current in 2nd Embodiment of the charging system for vehicles which concerns on this invention. It is explanatory drawing which shows the example in case charging is completed appropriately even if the noise current flows in 2nd Embodiment of the charging system for vehicles which concerns on this invention. It is a flowchart which shows the electric power feeding operation | movement in 2nd Embodiment of the charging system for vehicles which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a first embodiment of a vehicle charging system according to the present invention. As shown in FIG. 1, the vehicle charging system of the present embodiment is installed in a parking lot 2 in order to park a vehicle 1 that runs on battery power such as an electric vehicle. 2 includes a plurality of vehicle compartments 3.

  Further, the vehicle charging system includes a distribution board 4 to which power from an external power source (not shown) is supplied, and a leakage breaker 5 is installed in the distribution board 4. The vehicle charging system includes a charging unit 6 installed in each vehicle compartment 3 of the parking lot 2, and the charging unit 6 is provided with a control unit 7 that performs various controls. Each charging unit 6 is provided with an outlet 9 as a power supply side connector into which a power plug 8 as a power receiving side connector of the vehicle 1 parked in the passenger compartment is inserted. In the present embodiment, the outlet 9 portion is provided with a cover member 10 that covers the outlet 9 portion. Further, the outlet member 9 is closed by the control signal from the control unit 7. A lock mechanism 11 for holding is provided. The lock mechanism 11 holds the cover member 10 in a closed state in a state where the power plug 8 is inserted into the outlet 9. When the cover member 10 is not provided, the lock mechanism 11 may be configured by a mechanism that holds the power plug 8 inserted into the outlet 9 so as not to come off.

  Further, the charging unit 6 is provided with a power switch 12 electrically connected to the outlet 9, and the power switch 12 is a switch for opening and closing the connection with the power supply main line 13, and the distribution board 4 Is connected to the power supply main line 13 via the earth leakage breaker 14. The charging unit 6 is provided with a current sensor 15 that detects a current value sent to the outlet 9 and sends the current value to the control unit 7. The charging unit 6 detects a voltage value supplied to the outlet 9. A voltage detector 16 is provided.

  Further, the charging unit 6 is provided with a charging switch 17, and the power switch 12 is turned on by the control unit 7 when the charging switch 17 is turned on. When the power switch 12 is turned on, the power supply trunk line 13 and the outlet 9 are connected to supply power to the outlet 9. Further, the charging unit 6 is provided with a display unit 18 for displaying a predetermined guidance display such as charging acceptance, for example, and this display unit 18 follows guidance such as confirmation operation or cancellation operation of the guidance display. It is configured so that it can be operated. Further, the charging unit 6 is provided with a memory 19 and a timer 20.

  In general, as shown in FIGS. 2 and 3, a relatively small standby current flows during charging for a certain time immediately after the start of power supply, and then a relatively large charging current flows to start charging. It is what is done. The standby current varies depending on the type of vehicle 1 such as an electric vehicle, a hybrid vehicle, or an electric scooter, and a manufacturer. For example, FIGS. 2 and 3 show changes in current values during charging of different vehicles 1. This shows that there is a large difference in the standby current value.

  Therefore, in this embodiment, after starting the power supply, the current sensor 15 measures the standby current value, and the control unit 7 stores the standby current value as a threshold value in the memory 19 so that the charging current flows. When the current value is reduced to the standby current after charging, the charging is determined to be completed. The control unit 7 is configured to turn off the power switch 12 when it is determined that the charging is completed. As a result, the power supply main line 13 and the outlet 9 are disconnected, and the power is completely supplied. Will not be supplied to.

  Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG.

  In the present embodiment, first, the voltage detection unit 16 detects the power supply voltage (ST1), and if the voltage is not detected, the display unit 18 displays that charging is not possible (ST2). When the charging switch 17 is turned on after detecting the voltage (ST3), the cover member 10 of the charging unit 6 is opened, and the charging plug of the vehicle 1 is inserted into the outlet 9 (ST4). Charging confirmation is selected according to the 18 guidance display (ST5). Thereafter, the controller 7 operates the lock mechanism 11 to lock the cover member 10 (ST6). When the lock is completed (ST7: YES), power supply is started (ST8). On the other hand, when the lock is not completed (ST7: NO), an abnormality indicating that the lock cannot be performed is notified (ST9).

  Next, the power feeding operation will be described with reference to the flowchart shown in FIG.

  First, after initializing the current threshold value stored in the memory 19 (ST20), the power supply is turned on (ST21). Then, the power supply current value is measured by the current sensor 15 (ST22). If the current value is larger than 0, it is determined that the standby current is flowing, and the current value at this time is set as a threshold value ( ST23). On the other hand, when the feeding current remains 0, the voltage value is detected by the voltage detector 16 (ST24), and when the voltage can be detected, an abnormality that the power plug 8 is not connected is notified (ST25). ). If the voltage cannot be detected, an abnormality indicating a short circuit is notified (ST26).

  Then, the timer 20 starts measuring a certain monitoring time (ST27), measures the feeding current value during the monitoring time (ST28), and if the feeding current value exceeds the threshold value, the standby current flows. Judgment is made and the charging time is measured by the timer 20 (ST29). On the other hand, if the power supply current does not exceed the threshold during the monitoring time, for example, it is determined that the battery has already been fully charged, and the charging is ended after the monitoring time is over (ST30).

  Then, the feeding current value is measured (ST31), and when the feeding current value is equal to or less than the threshold value, the charging is terminated. Further, when the charging current value is equal to or greater than the threshold value and the charging time ends (ST32), the power supply is turned off (ST33).

  As shown in FIG. 4, when charging is completed (ST10), the feeding current value is measured (ST11). When the current value becomes 0, the lock mechanism 11 of the cover member 10 is then released (ST12). When the user removes the power plug 8 (ST13), all charging operations are completed. Further, when the feeding current is 0 or more, an abnormality is notified that it cannot be turned off (ST14). If cancel is selected after the outlet 9 is connected (ST15), the power plug 8 is removed from the outlet 9, and charging is terminated (ST13).

  As described above, in this embodiment, when power is supplied, the standby current is measured by the current sensor 15, the standby current value measured by the control unit 7 is set as a threshold value, and the current value is the threshold value. Since the charging is terminated when it becomes lower, the charging can be reliably terminated even when the standby current value varies depending on the vehicle 1. As a result, it is possible to prevent standby current from being consumed during charging, and to save power.

  In the above embodiment, the charging time is measured by the timer 20, and even when the current value is not lower than the threshold value, the charging is terminated when the charging time elapses. Control may be made so that charging is terminated only when the current value becomes lower than the threshold value without measuring time.

  Next, a second embodiment of the present invention will be described.

  In the present embodiment, as shown in FIG. 6, the charging unit 6 is provided with a charging start determination timer 21 and a charging end determination timer 22. Then, after starting the power supply, the standby current value is measured by the current sensor 15, and the control unit 7 stores the standby current value as a threshold value in the memory 19, and the charging current flows to perform charging. It is the same as that of the said 1st Embodiment about the point comprised so that it may be judged that charge is completed when an electric current value falls to standby current later.

  In this case, in the present embodiment, the configuration is such that the charging start determination timer 21 starts measuring time when the current value exceeds the threshold value after the standby current flows after the power supply is started. Has been. Then, the control unit 7 starts charging when the current value exceeds the threshold value and measurement by the charging start determination timer 21 is started, and the charging current flows when a certain time has elapsed. It is comprised so that it may judge.

  Further, the charging end determination timer 22 is configured to start time measurement by the charging end determination timer 22 when the current value becomes equal to or less than a threshold value from the state where the charging current is flowing. Then, the control unit 7 determines that the charging is completed when the current value becomes equal to or less than the threshold value and the measurement by the charging end determination timer 22 is started, and when a predetermined time has elapsed and the standby current is flowing. Is configured to do.

  In a state where standby power or charging current is flowing while power is supplied, noise current may flow for some reason. In this case, if the control is performed only with the threshold value of the current value, there is a possibility that a malfunction of the charging control may occur due to the noise current. That is, for example, as shown in FIG. 7, when a noise current exceeding a threshold value flows in a state where a standby current flows after starting the power supply, charging is performed due to the noise current flowing. It is determined that charging has been completed because the noise current has dropped to the threshold value, and charging has ended even though charging has not actually started. Sometimes. Also, for example, as shown in FIG. 8, when a noise current that is equal to or lower than the threshold value flows in a state where the charging current is flowing, it is determined that the charging is finished, and the charging is finished. May end up.

  In the present embodiment, such inconvenience due to the noise current is solved, and as described above, when a predetermined time has elapsed by the charge start determination timer 21 and the charge end determination timer 22, the charge current or the standby current When the battery is flowing, it is determined that charging has started or ended. For example, as shown in FIG. 9, a noise current exceeding the threshold flows in a state where the standby current flows. Even when the charging start determination timer 21 returns to the standby current before the fixed time elapses, the longitudinal start is not determined. Further, even when a noise current that is equal to or less than the threshold value flows in a state where the charging current is flowing, it is determined that the charging is ended if the charging current returns to the predetermined time by the charging end determination timer 22. Will not be.

  Since other configurations are the same as those in the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. In addition, since the operation | movement about charge is the same as that of the said 1st Embodiment, in this embodiment, only electric power feeding operation | movement is demonstrated.

  In the present embodiment, first, the current threshold value stored in the memory 19 and the charge start determination timer 21 and the charge end determination timer 22 are initialized (ST40), and then the power supply is turned on (ST41). . Then, the feeding current is measured by the current sensor 15 (ST42). If the current value is larger than 0, it is determined that the standby current is flowing, and the current value at this time is set as a threshold value (ST43). ). On the other hand, when the feed current remains 0, the voltage value is detected by the voltage detector 16 (ST44), and when the voltage can be detected, an abnormality that the power plug 8 is not connected is notified (ST45). ). If the voltage cannot be detected, an abnormality indicating a short circuit is notified (ST46).

  Then, the timer 20 starts measuring a certain monitoring time (ST47), measures the feeding current during the monitoring time (ST48), and if the feeding current value exceeds the threshold, the charging start determination timer 21 Measurement is performed for a certain time (ST49). Thereafter, even when the power supply current value exceeds the threshold value by the charge start determination timer 21 until the measurement for a predetermined time is completed, the measurement by the charge start determination timer 21 is continued as it is. Then, when the measurement of the fixed time is completed by the charging start determination timer 21 (ST50: YES), it is determined that the charging current has flowed, and the charging time is measured by the timer 20 (ST51). On the other hand, if the power supply current does not exceed the threshold during the monitoring time, for example, it is determined that the battery has already been fully charged, and the charging is ended after the monitoring time is over (ST52).

  Then, the power supply current value is measured (ST53), and when the power supply current value is equal to or less than the threshold value, the charging end determination timer 22 measures for a certain time (ST54). Then, even when the power supply current value becomes equal to or less than the threshold value by the end of the measurement of the fixed time by the charge end determination timer 22, the measurement by the charge end determination timer 22 is continued until the end of the charge time. . When the charging end determination timer 22 ends the measurement for a certain time (ST55: YES), and when the charging time ends when the feeding current is equal to or greater than the threshold value (ST56), the charging is ended, Supply is turned off (ST57).

  As described above, also in the present embodiment, as in the first embodiment, when power is supplied, the standby current is measured by the current sensor 15, and the standby current value measured by the control unit 7 is set as a threshold value. However, since the charging is terminated when the current value becomes lower than the threshold value, the charging can be reliably terminated even when the standby current value varies depending on the vehicle 1. As a result, it is possible to prevent standby current from being consumed during charging, and to save power. Furthermore, in the present embodiment, the charging start determination timer 21 and the charge end determination timer 22 allow the standby current value to exceed the threshold value and the charging current value to be equal to or less than the threshold value during measurement for a fixed time. Even if there is a noise current, the charging start or the charging end can be properly determined even if the noise current flows while the standby current or the charging current is flowing. It becomes possible.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible based on the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Parking lot 3 Car compartment 4 Distribution board 6 Charging unit 7 Control part 8 Power plug 9 Outlet 10 Cover member 11 Lock mechanism 12 Power switch 13 Power supply main line 14 Earth leakage breaker 15 Current sensor 16 Voltage detection part 17 Charge switch 18 Display Unit 19 Memory 20 Timer 21 Charge Start Determination Timer 22 Charge End Determination Timer

According to a third aspect of the present invention, in the second aspect of the present invention, the timer further includes a function of measuring a monitoring time of a predetermined time after the start of power supply, and the control unit has a current value during the monitoring time. When the threshold value is not exceeded, the charging is controlled to end.

Claims (5)

A plurality of cabins installed in a parking lot where electric vehicles can be parked;
A power supply trunk line supplied with power from an external power source;
A control unit, a power receiving side connector connected to a power receiving side connector of a vehicle parked in the passenger compartment, and power is supplied from the power supply main line; a current sensor that measures a current value flowing through the power feeding side connector; A charging unit with
The control unit sets a standby current value detected at the start of power supply by the current sensor as a threshold value, and determines that charging is completed when the current value during charging becomes lower than the threshold value. A vehicle charging system, wherein the vehicle charging system is controlled to be terminated.   The charging unit includes a timer for measuring a charging time after the threshold value is exceeded, and the control unit performs control so as to end the charging when the charging time by the timer elapses for a predetermined time. The vehicle charging system according to claim 1.   The timer measures a monitoring time of a certain time after the start of power supply, and the control unit terminates charging when the current value does not exceed the threshold during the monitoring time. The vehicle charging system according to claim 2, wherein the vehicle charging system is controlled as follows. When the current value exceeds the threshold value after the start of power supply and the standby current flows, the charge start determination timer that starts measurement for a predetermined time and the current value from the state where the charge current is flowing A charge end determination timer that starts measurement for a predetermined time when the value is equal to or less than the threshold value,
The control unit determines that charging is started when a charging current is flowing when a current value exceeds a threshold value and measurement by the charging start determination timer is started and a predetermined time has elapsed. At the same time, when the current value becomes equal to or less than the threshold value and measurement by the charge end determination timer is started and a predetermined time has passed and the standby current is flowing, it is determined that the charge has ended. The vehicle charging system according to any one of claims 1 to 3, wherein the vehicle charging system is characterized in that:   The said charging unit is provided with the voltage detection part which detects the voltage value supplied, The charging system for vehicles as described in any one of Claims 1-3 characterized by the above-mentioned.

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