JP5408451B2 - Hybrid vehicle - Google Patents

Description

  The present invention relates to a hybrid vehicle that obtains a driving force by an electric motor.

  As an electric vehicle, a hybrid electric vehicle in which a battery is charged by an engine and the vehicle is driven by the driving force of the electric motor using electric power from the battery, or the vehicle is charged by the engine and the electric motor and / or the driving force of the engine. A hybrid electric vehicle that travels and an electric vehicle that travels by a driving force of an electric motor are known.

  For example, a hybrid electric vehicle that runs a vehicle with at least one driving force of an engine and an electric motor includes a high-voltage battery. When the vehicle is driven by the electric motor, electric power is supplied from a high-voltage battery, and the engine is appropriately driven to store the electric power in the high-voltage battery. Further, when the vehicle is driven by the electric motor and / or the engine, the driving force of the engine is used as a driving power source.

  In the hybrid electric vehicle, even when the engine is stopped, the engine is driven to charge the high voltage battery depending on the charging state of the high voltage battery and the like. In this case, it is assumed that the engine is started during work when maintenance of the equipment in the engine room is performed.

  For this reason, a hybrid electric vehicle has been proposed in which a warning is issued for the purpose of alerting the operator when it is detected that the hood in the engine room is open while the hybrid system is activated. (For example, refer to Patent Document 1). By using the technique disclosed in Patent Document 1, an operator can be notified by an alarm when there is a possibility that the engine may be started or when the engine is started in a situation where the hood is open.

  However, in a hybrid electric vehicle, depending on the state of a high-voltage battery, the engine may be started simultaneously with an alarm immediately after opening the hood or immediately after starting maintenance work. In this case, it is conceivable that the timing at which an alarm is issued overlaps the timing at which the engine and auxiliary equipment are activated, and the engine and auxiliary equipment are activated during work even if the alarm is recognized.

  Even if this is an electric vehicle that drives the vehicle by the driving force of the electric motor, when the maintenance is performed in a state where the system is activated, the electric motor, the high-voltage battery, Similarly, it is conceivable that a radiator fan for cooling the inverter or the like is started.

JP 2000-308210 A

  The present invention has been made in view of the above situation, and even when the devices are activated in a state where the control system is activated, the worker can be surely recognized that the device has been activated before the activation. An object is to provide a hybrid vehicle that can be used.

  In particular, in a hybrid electric vehicle equipped with an engine that obtains a high-voltage battery charge and / or vehicle driving force, even if the engine starts up while the hybrid control system is running, In contrast, an object of the present invention is to provide a hybrid vehicle that can reliably recognize the start of the engine before the start.

  In order to achieve the above object, a hybrid vehicle according to a first aspect of the present invention is an electric motor driven by electric power supplied from a battery, and starts when a predetermined condition is met and drives a generator to charge the battery. An engine, a hood that opens and closes an engine room in which the engine is housed, an open / close detection means that detects opening and closing of the hood, and that the predetermined condition is met when the open state of the hood is detected In the hybrid vehicle having the notification means for performing the operation, the hybrid vehicle includes a prohibition means for prohibiting starting of the engine for a predetermined time after the notification by the notification means.

  In the present invention according to claim 1, when the open state of the hood is detected by the open / close detection means during the activation of the control system, an alarm is generated by the notification means, and the start of the engine is delayed, Before starting, the worker can be made to recognize the start of engine start by an alarm. For this reason, even if it will be in the situation where an engine starts in the state where the control system has started, it can make an operator recognize engine start before starting.

  The hybrid vehicle of the present invention according to claim 2 is the hybrid vehicle according to claim 1, wherein at least one of the predetermined conditions is that a remaining capacity of the battery is equal to or less than a predetermined value. Features.

  In the present invention according to claim 2, since the engine is activated when the remaining capacity of the battery falls below a predetermined value, the start of the engine is delayed in a situation where the engine is immediately activated. Can do.

  A hybrid vehicle according to a third aspect of the present invention is the hybrid vehicle according to the first or second aspect, further comprising a prohibited time setting means for arbitrarily setting the predetermined time.

  In the present invention according to claim 3, since the predetermined time for starting the engine can be arbitrarily set by the prohibited time setting means, the start of the engine is delayed in consideration of the operator's intention depending on the work situation or the like. be able to.

  The hybrid vehicle of the present invention according to claim 4 is the hybrid vehicle according to claim 3, wherein the prohibition time setting means changes the arbitrarily set predetermined time after notification by the notification means. A change means is provided.

  In the present invention according to claim 4, since the arbitrarily set predetermined time can be changed, the engine start can be delayed by adding a desired delay time depending on the work situation or the like.

  The hybrid vehicle of the present invention is in a state where the engine is started in a state where the hybrid control system is activated in a hybrid vehicle including an engine that obtains a high-voltage battery and / or obtains driving power of the vehicle. In addition, it becomes possible for the worker to reliably recognize the start of the engine before the start.

1 is a schematic view of an electric vehicle according to a first embodiment of the present invention. It is a control flowchart. It is a control flowchart. It is a timing chart. It is a control flowchart of another Example. It is a control flowchart of another Example. It is a control flowchart of another Example.

  In this embodiment, as an electric vehicle, an example is described in which a hybrid vehicle in which a generator is driven by an engine to charge a high-voltage battery and the vehicle is driven by the driving force of the electric motor and the engine is applied. .

  FIG. 1 is an overall schematic diagram illustrating the configuration of an electric vehicle (hybrid vehicle) according to a first embodiment of the present invention. FIGS. 2 and 3 are control flowcharts for generating an alarm and delaying engine start. 4 shows the change in the operating condition over time.

  The outline of the electric vehicle according to the first embodiment of the present invention will be described with reference to FIG.

  As shown in the figure, the vehicle 1 includes an engine 2 as a device and a generator 3 driven by the engine 2. The output system of the engine 2 is connected to the axle 6 on the front wheel 5 side through the transmission 4. On the other hand, an electric motor 7 is connected to the transmission 4, and the vehicle 1 travels by driving the axle 6 by the driving force of the electric motor 7 and the engine 2. The driving force of the electric motor 7 and the engine 2 is selected as appropriate through clutch means (not shown) and transmitted to the transmission 4.

  The vehicle 1 is equipped with a fuel tank 11 that supplies fuel to the engine 2. A high voltage battery 12 is mounted on the vehicle 1, and electric power is supplied from the battery 12 to the electric motor 7 via the inverter 13 to drive the electric motor 7. Further, power is generated by the generator 3 by driving the engine 2, and the electric power generated by the generator 3 is stored in the battery 12 via the inverter 13 (the battery 12 is charged).

  In the figure, reference numeral 10 denotes a radiator fan, and the engine 2 is cooled by the radiator fan 10. Also, the radiator fan 10 cools devices such as the electric motor 7, the high-voltage battery 12, and the inverter 13.

  Control of the vehicle 1 including control of the driving force of the electric motor 7 and the engine 2, power supply control to the electric motor 7, and control of charging the battery 12 from the generator 3 is based on commands from the ECU 15 as control means. Based on the integrated control. In other words, the ECU 15 includes a counter and timers, and serves as means for managing the control of the vehicle 1 and managing the high-voltage battery 12.

  For example, whether or not the hybrid control system (high voltage system) is activated is determined based on the status of the relay 16 provided in the battery 12. Further, based on the capacity (SOC) of the battery 12, the start of the engine 2, the start of the electric motor 7, the connection status of the transmission 4 and the like are controlled in an integrated manner.

  Thereby, the generator 3 is driven by the engine 2 to charge the battery 12, and the vehicle 1 is caused to travel by the driving of the electric motor 7 by the electric power from the battery 12 and the driving force by the driving of the engine 2.

  In the vehicle 1 described above, when the high voltage system is activated, the engine 2 may be stopped even when the vehicle 1 is traveling. Even if the engine 2 is stopped while the vehicle 1 is stopped, etc., when the capacity (SOC) of the battery 12 is reduced, the engine 2 is started and the engine 2 is started.

  For this reason, when the hood of the engine room is opened while the high voltage system is activated, an alarm is issued and notified. That is, a hood switch 21 is provided as an open / close detection means for detecting opening / closing of the hood in the engine room, and information on the hood switch 21 is input to the ECU 15. The ECU 15 determines that the hood is opened when the hood switch 21 is off, and determines that the hood is closed when the hood switch 21 is on.

  In addition, the vehicle 1 is provided with an informing means 22, and if it is determined that the hood is opened while the high voltage system is activated, the engine 2 is stopped when the engine 2 is stopped and the start condition is satisfied. 2 is started, the notification means 22 is actuated by a command from the ECU 15, and a notification such as a sound, that is, a warning is issued.

  In the vehicle 1 (electric vehicle) of this embodiment, the engine 2 is not started at the same time as the start condition is satisfied, but the engine start (start start) is prohibited (delayed) by the prohibiting means of the ECU 15. It has become. Thus, even when the worker is working with the hood opened, the worker can be surely recognized that the engine 2 has been started before the engine 2 is started.

  A control for generating an alarm and prohibiting (delaying) starting of the engine will be specifically described based on FIGS.

  As shown in FIG. 2, it is determined whether or not the hybrid control system (high voltage system) is activated in step S1, and if it is determined that the high voltage system is activated in step S1, the engine is determined in step S2. It is determined whether the starting condition 2 is satisfied. The starting condition of the engine 2 is a condition in which the state of the vehicle 1 becomes a state in which the engine 2 is started when the engine 2 is stopped, for example, a condition in which the capacity (SOC) of the battery 12 is less than 50%. Is included.

  If it is determined in step S2 that the engine 2 start condition is satisfied, it is determined in step S3 whether the hood switch 21 is off, that is, whether the hood in the engine room is open. If it is determined in step S3 that the hood switch 21 is off, it is determined in step S4 whether or not the vehicle 1 is stopped, that is, whether or not the vehicle speed is a predetermined vehicle speed or less. If it is determined in step S4 that the vehicle 1 is stopped, it is determined in step S5 whether or not the engine 2 is to be started by the service.

  If it is determined in step S1 that the high voltage system has not been started, or if it is determined in step S2 that the start condition of the engine 2 has not been established, the routine proceeds to step S11 in FIG. The count value C is cleared (A), and the process returns.

  If it is determined in step S3 that the hood switch is not OFF (ON: hood closed), or if it is determined in step S4 that the vehicle 1 is not stopped, the process proceeds to step S12 in FIG. The count value C of the start delay counter is cleared (B), the engine 2 is started in step S21, and the process returns.

  When it is determined in step S5 that the engine 2 is to be started by the service, the process proceeds to step S13 in FIG. 3 and the count setting value Cj of the start delay counter is set to 0 (C).

  Returning to the flowchart of FIG. 2, when it is determined in step S5 that the engine 2 is not started by the service, it is determined in step S6 whether the capacity (SOC) of the battery 12 is equal to or less than a predetermined value. The SOC that is the criterion for the determination in step S6 is set to a value lower than the SOC included in the determination of whether or not the engine 2 start condition is satisfied in step S2.

  If it is determined in step S6 that the capacity (SOC) of the battery 12 is equal to or less than the predetermined value, it is determined in step S7 whether or not the shift position is in the travel position. If it is determined in step S7 that the shift position is the traveling position, the process proceeds to step S13 in FIG. 3, and the count setting value Cj of the start delay counter is set to 0 (C).

  If it is determined in step S6 that the capacity (SOC) of the battery 12 is not equal to or less than the predetermined value, or if it is determined in step S7 that the shift position is not in the travel position, the process proceeds to step S14 in FIG. The count setting value Cj of the start delay counter is set to T (second: for example, 60 seconds) (D: prohibition time setting means). The count setting value Cj can be set at an arbitrary time in consideration of the operator's intention.

  As shown in FIG. 3, after setting the count setting value Cj of the start delay counter to 0 in step S13, or after setting the count set value Cj of the start delay counter to T (seconds) in step S14, step S15 In step S16, the start delay counter starts counting, and in step S16, the notification means 22 is activated to start an alarm.

  When an alarm is started in step S16, the count value C of the start delay counter is compared with the count set value Cj in step S17, and it is determined in step S17 that the count value C of the start delay counter is greater than or equal to the count set value Cj. In step S21, the engine 2 is started and returns. If it is determined in step S17 that the count value C of the start delay counter does not exceed the count set value Cj, the process directly returns.

  That is, when the engine start condition is satisfied, the hood is open and the vehicle 1 is stopped, or when the engine is started by service, the count setting value Cj of the start delay counter is 0, so that the engine 2 is Start. Thereby, it is possible to make the worker recognize that the engine 2 is started by the service.

  If the engine start condition is satisfied, the hood is opened and the vehicle 1 is stopped, or if the engine 2 is not started by service, the SOC is equal to or less than a predetermined value and the count setting value Cj of the start delay counter is T ( Second), the engine 2 is started T seconds after the alarm is issued. Thereby, it is possible to make the worker who is working with the hood open recognize that the engine 2 starts after T seconds.

  In addition, an alarm is generated on the condition that the vehicle 1 is stopped and the start of the engine 2 is delayed, so that, for example, when the hood is intentionally opened and the hood switch 21 is in trouble, In such a case, even if the vehicle 1 is not stopped, a warning is not issued and the start of the engine 2 is not delayed.

  Based on FIG. 4, the temporal change in the operation of the vehicle 1 described above will be described. 4, (a) is the status of the high voltage system, (b) is the status of establishment of the engine start condition, (c) is the status of the hood switch 21, (d) is the status of the alarm, and (e) is the start delay counter. (F) shows the engine speed.

  When the high-voltage system is started at time t1 (a), when the engine start condition is satisfied at time t2 (b), the engine 2 is started and the engine speed increases (f), and the engine start condition is not satisfied at time t3. When (b), the engine 2 is stopped and the engine speed becomes zero (f).

  At time t4, it is detected that the hood switch 21 is turned off and the hood is opened (c). When the engine start condition is satisfied at time t5 (b), an alarm is issued (d) and the start delay counter counts. (E). Since the count value of the start delay counter becomes the count set value Cj at time t6 and the engine start condition is satisfied (b), the engine 2 is started (f). The time from time t5 to time t6 is T seconds.

  When the rotational speed of the engine 2 reaches a predetermined rotational speed at time t7 (f), the alarm is stopped (d). The time when the alarm stops may be simultaneously with the start of the engine 2 and can be set at an arbitrary time. When the engine start condition is not satisfied at time t8 (b), the count value of the start delay counter is cleared (e), the engine 2 is stopped, and the engine speed becomes 0 (f).

  When the engine start condition is satisfied at time t9 (b), an alarm is issued (d) and the start delay counter is counted (e). When it is detected that the hood switch 21 is turned on and the hood is closed at time t10 before T seconds elapse from time t9 (c), the alarm is stopped (d) and the hood is closed. As a result, the engine 2 starts and the engine speed increases (f). At the same time, the count value of the start delay counter is cleared (e).

  When the engine start condition is not satisfied at time t11 (b), the engine 2 is stopped and the engine speed becomes 0 (f). At time t12, it is detected that the hood switch 21 is turned off and the hood is opened (c). When the engine start condition is satisfied at time t13 (b), an alarm is issued (d) and the start delay counter counts. (E). When the high voltage system is stopped at time t14 before T seconds elapse from time t13 (a), the alarm is stopped (d), and the count value of the start delay counter is cleared (e).

  Therefore, the electric vehicle according to the present embodiment described above is not allowed to generate an alarm by the notifying means 22 and to prohibit an alarm when the engine start condition is established and the hood is opened during the start of the high voltage system. By means, the start of the engine 2 can be delayed for T seconds so that the operator can recognize the start of the engine 2 by an alarm before the engine 2 starts. For this reason, even if it will be in the condition where the engine 2 starts in the state which has started the high voltage system, it can make a worker recognize the start of the engine 2 reliably before starting.

  Another embodiment of the control for generating an alarm and delaying the start of the engine will be specifically described based on FIGS. In this embodiment, the setting value of the start delay counter is extended using the signal of the hood switch 21 based on the intention of the operator. That is, the additional delay time is added to the preset count value (prohibited time) of the start delay counter.

  As shown in FIG. 5, it is determined whether or not the hybrid control system (high voltage system) is activated in step S51. If it is determined that the high voltage system is activated in step S51, the engine is determined in step S52. It is determined whether the starting condition 2 is satisfied. The starting condition of the engine 2 is a condition in which the state of the vehicle 1 becomes a state in which the engine 2 is started when the engine 2 is stopped, for example, a condition in which the capacity (SOC) of the battery 12 is less than 50%. Is included.

  If it is determined in step S52 that the engine 2 start condition is satisfied, the state of the hood in the engine room is determined in step S53. That is, although details of the determination will be described later, it is determined whether or not the hood is open. If it is determined in step S53 that the hood is open, it is determined in step S54 whether the vehicle 1 is stopped, that is, whether the vehicle speed is equal to or lower than a predetermined vehicle speed. If it is determined in step S54 that the vehicle 1 is stopped, it is determined in step S55 whether or not the engine 2 is to be activated by the service.

  If it is determined in step S51 that the high voltage system has not been started, or if it is determined in step S52 that the start condition of the engine 2 has not been established, the process proceeds to step S61 in FIG. The count value C is cleared (E) and returns.

  If it is determined in step S53 that the hood is not open, or if it is determined in step S54 that the vehicle 1 is not stopped, the process proceeds to step S62 in FIG. Is cleared (F), the engine 2 is started in step S60, and the process returns.

  If it is determined in step S56 that the capacity (SOC) of the battery 12 is equal to or less than the predetermined value, it is determined in step S57 whether or not the shift position is in the travel position. If it is determined in step S57 that the shift position is the traveling position, the process proceeds to step S63 in FIG. 6 and the count setting value Ci of the start delay counter is set to 0 (G).

  If it is determined in step S56 that the capacity (SOC) of the battery 12 is not equal to or less than the predetermined value, or if it is determined in step S57 that the shift position is not in the travel position, the process proceeds to step S64 in FIG. The count setting value Ci of the start delay counter is set to T (second: for example, 60 seconds) (H: prohibited time setting means).

  Here, the processing for determining the hood state in step S53 will be specifically described with reference to FIG. Although details will be described later, since the hood switch 21 is used as an extension switch and the on / off of the hood switch 21 is used for the extension determination, whether or not the hood is open is determined by the following processing.

  As shown in FIG. 7, when the hood state determination is started, it is determined in step S71 whether or not the hood state determination (results of steps S75 and S80 described later) is opened. If it is determined in step S71 that the determination of the hood state is open (hood switch 21: off), it is determined in step S72 whether the hood switch 21 is on. If it is determined in step S72 that the hood switch 21 is on, the closed counter is counted in step S73, and the count value C1 of the closed counter is compared with the closed determination value Chc in step S74.

  If it is determined in step S74 that the count value C1 of the close counter is equal to or greater than the close determination value Chc, it is determined in step S75 that the hood is closed, and the count value C1 of the close counter is cleared in step S76 to end the process. It becomes. If it is determined in step S74 that the count value C1 of the closing counter is less than the closing determination value Chc, the end is reached. If it is determined in step S72 that the hood switch 21 is not on, the count value C1 of the closed counter is cleared in step S76, and the process is ended.

  That is, when the count value C1 of the closing counter becomes equal to or greater than the closing determination value Chc after the hood switch 21 is turned on (when the closed state continues for a predetermined time), it is determined that the hood is closed. .

  On the other hand, if it is determined in step S71 that the hood switch 21 is not OFF, it is determined in step S77 whether the hood switch 21 is OFF. If it is determined in step S77 that the hood switch 21 is off, the open counter is counted in step S78, and the count value C2 of the open counter is compared with the open determination value Cho in step S79.

  If it is determined in step S79 that the count value C2 of the open counter is greater than or equal to the open determination value Cho, it is determined in step S80 that the hood is open, and the count value C2 of the open counter is cleared in step S81 to end the process. It becomes. If it is determined in step S79 that the count value C2 of the open counter is less than the open determination value Cho, the processing is ended. If it is determined in step S77 that the hood switch 21 is not OFF, the count value C2 of the open counter is cleared in step S81, and the process is ended.

  That is, when the count value C2 of the open counter becomes equal to or greater than the open determination value Cho after the hood switch 21 is turned off (when the open state continues for a predetermined time), it is determined that the hood is open.

  By executing the process of determining the hood state, the determination of the open / closed state of the hood and the determination as the extension switch can be performed by one hood switch 21.

  Returning to the processing of FIG. 6, after setting the count setting value Ci of the start delay counter to 0 in step S63, or after setting the count set value Ci of the start delay counter to T (seconds) in step S64, step S65 is performed. It is then determined whether or not the extension switch is on. The extension switch in this case is the hood switch 21. If the hood switch 21 is turned on in a state where the hood state determination has not started, it is determined that the extension switch is on.

  In step S64, the process of setting T (seconds) is executed only when the count setting value Ci is not set. Further, a dedicated switch can be provided as an extension switch without using the hood switch 21.

  If it is determined in step S65 that the extension switch is on, the changing unit adds a set extension value Xe (for example, 60 seconds) as an additional extension time to the count set value Ci in step S66 to set a new count. The value Ci is set (Ci = Ci + Xe), the start delay counter starts counting in step S67, and the alarm means 22 is activated in step S68 to start an alarm. The extension set value Xe can be set at an arbitrary time.

  If it is determined in step S65 that the extension switch is not on, the count setting value Ci is set to the count setting value Ci as it is in step S69 (Ci = Ci), and the start delay counter starts counting in step S67. In step S68, the notification means 22 is activated to start an alarm.

  When the alarm is started in step S68, the count value C of the start delay counter is compared with the count set value Ci in step S70, and it is determined in step S70 that the count value C of the start delay counter is equal to or greater than the count set value Ci. In step S60, the engine 2 is started and returns. If it is determined in step S70 that the count value C of the start delay counter does not exceed the count set value Ci, the process returns as it is.

  In other words, except for the case where the engine 2 is started by service, if it is determined that the extension switch is on, it is T seconds after the warning is issued that the operator intends to further delay the start of the engine 2. In addition to this, the engine 2 starts after an extended time. If it is determined that the extension switch is not on, the engine 2 is started T seconds after the warning is issued, assuming that the operator does not intend to delay the start of the engine 2.

  For this reason, an additional delay time (for example, 60 seconds) can be added to a preset delay time (T seconds) by the changing means. 2 start-ups can be delayed.

  In the process described above, the process of setting T (seconds) is executed only when the count setting value Ci is not set in step S64. However, the extension time may be set in steps S66 and S69. Is possible. That is, in step S66, Ce (extension time) = Ce (initial value is 0) + extension set value Xe, the extension time is added when the extension switch is on, and in step S69, Ce (extension time) = Ce. If the extension switch is off, the extension time is held at the previous value, and a process of determining in step S70 based on count value C ≧ count setting value Ci (initial setting value) + Ce (extension time) is executed. It is also possible to do.

  In the above-described embodiment, the additional extension time is added to the preset prohibition time (T seconds) by turning on / off the hood switch 21. However, instead of adding the additional extension time, a delay is added. Set a long time (T seconds), memorize the time from when the alarm is issued until the worker stops the alarm, set the memorized time as the next delay time, and set the extension time to any time It is also possible to set to.

  In the above-described embodiment, the engine 2 is described as an example of the device, but the device is not limited to the engine 2. For example, when an electric vehicle that drives the vehicle with the driving force of the electric motor is applied, when maintenance is performed with the control system activated, an electric motor, a high-voltage battery, an inverter, etc. Since the radiator fan for cooling starts, it is also possible to apply this invention to control of the start of a radiator fan.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field of electric vehicles that obtain driving force with an electric motor.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Generator 4 Transmission 5 Front wheel 6 Axle 7 Electric motor 10 Radiator fan 11 Fuel tank 12 Battery 13 Inverter 15 ECU
16 Relay 21 Hood switch 22 Notification means

Claims (4)

An electric motor driven by electric power supplied from a battery; an engine that starts when a predetermined condition is met and drives a generator to charge the battery; a hood that opens and closes an engine room in which the engine is housed; and the hood In a hybrid vehicle having an open / close detecting means for detecting opening / closing of the hood and an informing means for informing that the predetermined condition is met when the open state of the hood is detected,
A hybrid vehicle comprising prohibiting means for prohibiting starting of the engine for a predetermined time after notifying by the notifying means. The hybrid vehicle according to claim 1,
At least one of the predetermined conditions is that a remaining capacity of the battery is equal to or less than a predetermined value. In the hybrid vehicle according to claim 1 or 2,
A hybrid vehicle comprising: a prohibited time setting means for arbitrarily setting the predetermined time. In the hybrid vehicle according to claim 3,
The prohibited time setting means includes:
A hybrid vehicle comprising: changing means for changing the arbitrarily set predetermined time after the notification by the notification means.

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