JP2010233377A - Discharge control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a discharge control device capable of discharging a smoothing capacitor of an inverter circuit with an existing structure in an electric vehicle without providing a particular load for discharge. <P>SOLUTION: An electric vehicle includes a high-voltage battery 31, an electric motor 50 which can be driven based on a voltage supplied from the high-voltage battery 31 by turning on a main switch 110, a driving section 35 which is provided with the inverter circuit 350 for converting a DC voltage supplied from the battery into an AC voltage to drive the electric motor 50, an MGU (control device) 34 which controls the drive section 35, and the smoothing capacitor 36 which is connected to the inverter circuit 350 to smooth the DC voltage received between the battery and the inverter circuit and to absorb voltage fluctuation. In this electric vehicle, when the main switch 110 is turned off, the accumulated electric charge is discharged by connecting a headlight 91, to which electric charge accumulated in the smoothing capacitor 36 is supplied, to the smoothing capacitor 36 via a power converter 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a discharge control device for an electric vehicle, and more particularly, to a discharge control device for discharging accumulated charges in a smoothing capacitor connected to an inverter circuit for driving an electric motor for traveling of an electric motorcycle. .

  In an electric vehicle, the rated voltage (for example, 72V) of a battery for driving an electric motor and the rated voltage (for example, 12V) of a control device such as an ECU (electronic control unit) or a motor controller are greatly different. In addition to a main battery (high voltage battery) that generates a high voltage (72 V) for the drive motor, a sub battery (low voltage battery) that generates a low voltage (12 V) for the control device is provided. Moreover, general electrical equipment such as headlights mounted on electric vehicles is also composed of normal parts (for motorcycles equipped with an internal combustion engine) driven by a low-voltage battery from the viewpoint of versatility.

  An electric vehicle is configured to drive an electric motor by converting a DC voltage from a high-voltage battery into a three-phase AC voltage by an inverter circuit. The main purpose is to absorb power supply voltage fluctuations on the input side of the inverter circuit. The large-capacity smoothing capacitor (power storage means) is connected and charged at the start of traveling.

  On the other hand, when the smoothing capacitor is charged and traveling is not expected, the smoothing capacitor is left in a charged state for a long time, and there is a problem that the life of the smoothing capacitor is shortened.

  In view of this, it has been proposed to provide a discharge circuit for discharging the electric charge accumulated in the smoothing capacitor in the drive control device for an electric vehicle (see Patent Document 1).

JP 2008-289304 A

  However, with the configuration of Patent Document 1 described above, it is necessary to newly provide a discharge circuit having a discharge resistance in the power supply circuit for driving the electric motor of the electric vehicle, which increases the number of components and the associated cost. There was a problem of inviting.

  The present invention has been proposed in view of the above circumstances, and in an electric vehicle capable of discharging a smoothing capacitor of an inverter circuit that drives an electric motor with an existing configuration in the electric vehicle without providing a discharge load dedicated to discharging. An object is to provide a discharge control device.

In order to achieve the above object, the discharge control device according to claim 1 can be driven based on the voltage supplied from the battery (main battery 31) by turning on the battery (main battery 31) and the main switch (110). An electric motor (50) and an inverter circuit (350) for converting a DC voltage supplied from the battery (main battery 31) into an AC voltage, and a driving unit (50) for driving the electric motor (50) 35), a control device (34) for controlling the drive unit (35), and the battery connected to the inverter circuit (350) and exchanged between the battery (main battery 31) and the inverter circuit (350). In the electric vehicle including the smoothing capacitor (36) that absorbs the voltage fluctuation by smoothing the DC voltage,
When the main switch (110) is turned off, circuit means (100) for supplying electric charge accumulated in the smoothing capacitor (36) to a lighting device (90) provided in the electric vehicle is provided with the smoothing capacitor (36). The first feature is that the connection is made with respect to.

A second aspect of the present invention relates to the discharge control apparatus for an electric vehicle according to the first aspect,
A second feature of the circuit means (100) is that it includes a power converter (32) that converts a voltage generated by the smoothing capacitor (36) into a voltage supplied to an electric load of the electric vehicle.

A third aspect of the present invention relates to the discharge control apparatus for an electric vehicle according to the first or second aspect,
A third feature of the lighting device (90) is that it is a headlight (91) that is always lit when at least the main switch (110) is on.

A fourth aspect of the present invention relates to the discharge control apparatus for an electric vehicle according to the third aspect,
Switch means (120) that is turned on and off in response to the main switch (110) between the battery (main battery 31) and the drive unit (35),
The power converter (32) is connected by a line between the switch means (120) and the drive unit (35), and when the switch means (120) is off, the smoothing capacitor (36) When the switch means (120) is on, the power of the battery (main battery 31) is dropped to reduce the voltage of the discharge power to the headlight (91) and the drive unit (35). A fourth feature is that the power supply of the control device (34) is supplied.

A fifth aspect of the present invention relates to the discharge control device for an electric vehicle according to the fourth aspect,
The electric vehicle includes a sub-battery (30) for electric load of the vehicle,
The power converter (32) operates by being supplied with electric power from the sub-battery (30), and supplies electric power as an auxiliary power source for the drive unit (35) and the control device (34). It is a feature.

A sixth aspect of the present invention relates to the discharge control apparatus for an electric vehicle according to the second aspect,
The electric vehicle includes a step floor portion (9a) in front of the seat (14),
The electric motor (50) is provided in the vicinity of the rear wheel axle (19) at the rear of the swing arm (12) that supports the rear wheel (WR).
The battery (main battery 31) is disposed on the step floor portion (9a),
The smoothing capacitor (36) is provided at a rear portion of the battery (main battery 31) at a front portion of the swing arm (12),
The power converter (32) is characterized in that it is provided under the seat (14) between the battery (main battery 31) and the smoothing capacitor (36).

  According to the configuration of claim 1 having the first feature, the charge accumulated in the smoothing capacitor (36) can be discharged via the lighting device (90) mounted on the electric vehicle. Since the discharge control device can be realized without providing a discharge load or the like, an increase in the number of parts can be prevented.

  According to the configuration of claim 2 having the second feature, the circuit means (100) including the power converter (32) for converting the voltage generated by the smoothing capacitor (36) into the voltage supplied to the electric load of the electric vehicle. ) Through which the lamp (90) is connected, it is possible to use a lamp with a standard (rated voltage of 12V), and to suppress an increase in manufacturing cost when manufacturing the discharge control device. it can.

  According to the configuration of claim 3 having the third feature, the discharge of the smoothing capacitor (36) can be completed quickly by using the lamp (90) as a headlight (91) having a large load resistance. Further, since the lighting device (90) is lit during traveling, even if the lighting is continued for a short period after the main switch (110) is turned off, there is no sense of incongruity.

  According to the configuration of claim 4 having the fourth feature, the switch means (relay switch 120) is turned off by providing the switch means (relay switch 120) which is turned on / off in response to the main switch (110). When the discharge power of the smoothing capacitor (36) is dropped by the power converter (32) and supplied to the headlight (91). When the switch means (relay switch 120) is on, the battery (main battery 31) ) Can be dropped by the power converter (32) to supply power to the drive unit (35) and the control device (34).

According to the structure of Claim 5 which has a 5th characteristic, a power converter (32) is provided with a sub battery (30) for the electrical load (general electrical equipment 150) of an electric vehicle, and a power converter (32) 30).
Moreover, a power converter (32) can be used as these auxiliary power supplies by supplying electric power to a drive part (35) and a control apparatus (34).

  According to the structure of Claim 6 which has a 6th characteristic, in an electric vehicle provided with the step floor part (9a) ahead of a seat (14), an electric motor (50), a battery (main battery 31), a smoothing capacitor ( 36) Since the power converter (32) is provided substantially below the center of the vehicle, the wiring line is routed from the center, so that the harness can be easily routed.

It is side explanatory drawing which shows the external appearance of the electric vehicle by which the discharge control apparatus of this invention is mounted. It is a perspective explanatory view of an electric vehicle. It is side surface explanatory drawing of a swing arm. It is a section explanatory view of a swing arm. It is a block diagram in a state where a main switch of a drive control device containing a discharge control device concerning one embodiment of the present invention is closed. FIG. 6 is a block diagram when the main switch of the drive control device of FIG. 5 is in an open state. In a discharge control device, it is a state explanatory view showing an output state or an operation state of each part at the time of running or stopping of an electric vehicle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of an electric vehicle 1 according to an embodiment of the present invention.
FIG. 2 is a rear perspective view of the electric vehicle 1 with the exterior parts removed. The electric vehicle 1 is a scooter type motorcycle having a low floor, and is configured to drive the rear wheel WR with the rotational driving force of the electric motor 50 provided in the swing arm 12.
The high voltage battery (main battery) 31 that supplies power to the electric motor 50 is charged by connecting an external power source to a charging port (not shown) provided in the vehicle body.

A head pipe 3 that rotatably supports a steering stem 7a is coupled to the front end portion of the main frame 2. A steering handle 7 is attached to the upper part of the steering stem 7a, and a pair of left and right front forks 4 are attached to one lower part. A front wheel WF is rotatably supported at the lower end of the front fork 4.
In addition, cylindrical handle grips are attached to both ends of the steering handle 7 in the vehicle width direction. The handle grip on the right side in the vehicle width direction is configured as a rotary throttle device that adjusts the driving force of the vehicle, and a throttle opening sensor 341 is provided in the vicinity of the steering handle 7.
Around the head pipe 3, a main switch 110 for supplying power to each device mounted on the electric vehicle 1 for driving is mounted.

  A pair of left and right side frames 5 are connected to the lower side of the main frame 2, and a high voltage battery (main battery) 31 (for example, a power source) that supplies electric power to the electric motor 50 so as to be sandwiched between the left and right side frames 5. 72V). The side frame 5 is bent upward on the vehicle body on the rear side thereof, and is connected to a rear frame 6 that supports the luggage compartment 17 and the like.

  A pivot plate 20 on which a swing arm pivot 11 is formed is attached to the rear portion of the side frame 5. The swing arm pivot 11 is pivotally supported at the front end of a cantilever swing arm 12 that supports the rear wheel WR with only the left arm in the vehicle width direction. A rear wheel WR is rotatably supported on the rear portion of the swing arm 12 by an axle 19, and a rear end portion of the swing arm 12 is suspended from the rear frame 6 by a rear shock unit 13.

  Below the swing arm 12 is a motor driver (or PDU: power drive unit) that converts a direct current supplied from a high-voltage battery (main battery) 31 into an alternating current and supplies it to the electric motor 50. The drive unit 35 is disposed. The power supplied from the drive unit (motor driver) 35 is supplied to the electric motor 50 via the three power supply lines L. A first reduction gear 46 and a second reduction gear 47 of a reduction mechanism, which will be described later, are disposed on the rear side of the electric motor 50, and the rear wheel WR is driven by the rear wheel axle 19. A smoothing capacitor 36 is disposed in the vicinity of the drive unit (motor driver) 35.

A front cowl 9 as an exterior part is provided on the vehicle body front side of the steering handle 7, and a meter unit 8 including a speedometer and the like is attached to the upper part of the front cowl 9. A headlamp 10 is provided on the front side of the vehicle body of the front cowl 9. A switch 92 for switching between the high beam and the low beam in the headlamp 10 is provided at the root portion of the handle grip on the left side of the steering handle 7.
Further, a step floor portion (low floor floor) 9a on which a passenger puts his / her foot is formed on the upper portion of the high voltage battery (main battery) 31, and a seat cowl 15 is provided outside the rear frame 6. Yes. A seat 14 that is opened and closed by a hinge on the front side of the vehicle body is attached to the upper portion of the seat cowl 15. A seat switch 343 for recognizing whether or not the driver has boarded is mounted inside the seat 14.
A tail lamp device 16 is attached to the rear end portion of the seat cowl 15. A center stand 18 having two legs spaced apart in the vehicle width direction and having a stand switch 342 for detecting a lifted state is attached to the pivot plate 20.

  On the right side of the head pipe 3 in the vehicle width direction, a low voltage battery (sub-battery) 30 (for example, 12V) that supplies power to auxiliary devices such as the headlamp 10 and a control device is disposed. The low voltage battery (sub-battery) 30 can be charged by the electric power of the high voltage battery (main battery) 31. Inside the seat cowl 15 and in front of the luggage compartment 17 is a power converter (DC-DC converter: down converter) 32 that converts a high voltage (72 V) of a high voltage battery (main battery) 31 to a low voltage (12 V). In addition, a contactor box 33 for storing a fuse, a relay and the like is disposed. Further, a control device (MGU: managing unit) 34 for controlling a drive unit (motor driver) 35 and the like is attached to the outside of the rear frame 6 on the right side in the vehicle width direction via an attachment stay 34a.

  FIG. 3 is a side view of the swing arm 12. The same reference numerals as those described above denote the same or equivalent parts. The drive unit (motor driver) 35 is stored in a storage space provided on the lower surface side of the swing arm 12. The storage space is configured to form a closed space by attaching the cover member 21 from the lower side of the vehicle body using screws or the like. In the lower part of the cover member 21, a drain hole 21a for discharging moisture is formed on the rear side of the vehicle body.

  The electric motor 50 is disposed in the space in the swing arm 12 so as to overlap, that is, overlap with, the projection area of the rear wheel WR in a side view of the vehicle body. Between the drive unit (motor driver) 35 and the electric motor 50, a U-phase wiring 27, a V-phase wiring 28, and a W-phase wiring 29 as the power supply line L are routed. A first reduction gear 46 and a second reduction gear 47 of a reduction mechanism are disposed on the rear side of the electric motor 50, and the rear wheel WR is a rear wheel axle 19 (FIG. 1) that is a rotation shaft of the reduction gear 24. Drive). A rear shock unit mounting portion 25 that pivotally supports the lower end portion of the rear shock unit 13 is provided at the rear end portion of the swing arm 12.

  A smoothing capacitor 36 for removing the vibration of the voltage waveform is disposed on the side of the drive unit (motor driver) 35. The smoothing capacitor 36 is fixed to the inner wall surface of the swing arm 12 via the mounting stay 26.

  FIG. 4 is a cross-sectional view of the swing arm 12 as viewed from above the vehicle body. FIG. 5 is a partially enlarged view of FIG. The same reference numerals as those described above denote the same or equivalent parts. The swing arm 12 is pivotally supported via a swing arm pivot (pivot shaft) 11 with respect to a pair of left and right pivot plates 20. The pivot shaft 11 is a long bolt having a screw head 64, and is inserted into a cylindrical collar 63 supported by a boss 61 on the swing arm 12 side via a bush 62, and by a nut 65 on the right side in the vehicle width direction. It is fixed.

  A wide case portion 86 that accommodates the drive portion (motor driver) 35 is formed on the vehicle body front side of the swing arm 12. The cover member 21 (see FIG. 3) is attached to the lower surface side of the vehicle body of the wide case portion 86. A plurality of heat dissipating fins 87 for cooling the motor driver 35 are provided on the upper body of the wide case portion 86, and an electric fan for enhancing the cooling effect by forced air blowing on the upper side of the heat dissipating fins 87. 88 is disposed.

  The swing arm 12 according to the present embodiment is a cantilever type in which the rear wheel WR is pivotally supported by only the left arm portion, and the electric motor 50 and the connecting / disconnecting rotational driving force are located at the vehicle body rear side of this arm portion. A centrifugal clutch 40 and a speed reduction mechanism 70 as mechanisms are arranged in a concentrated manner.

  The electric motor 50 is an inner rotor type that is fixed to the inner wall of the swing arm 12 and includes a stator 51 having a stator coil 71 and a rotor 52 fixed to a motor drive shaft 53. The left side of the cylindrical motor drive shaft 53 in the figure is supported by a bearing 59 of a stator cover 58 attached to the inner wall of the swing arm 12 so as to cover the electric motor 50. A cylindrical collar 54 that supports a magnetic body 55 as a detected body of the motor rotation number sensor 72 is attached to the right end of the motor drive shaft 53 in the figure. The motor rotation speed sensor 72 having the detection unit 73 is fixed to the inner wall surface of the swing arm 12 with a mounting screw 74.

  The output shaft 43 is supported by a bearing 60 fitted to the transmission case 68 of the swing arm 12 on the right side of the electric motor 50 in the figure. As described above, the motor drive shaft 53 is supported by the bearing 59 on the left side of the electric motor 50 in the figure. As a result, the motor drive shaft 53 and the output shaft 43 are supported at two points on the left and right in the vehicle width direction of the electric motor 50. For example, the bearings 59, 60 are made smaller than the one-point support structure on one side. It becomes possible. An oil seal 77 is disposed on the left side of the bearing 60 in the figure.

  The centrifugal clutch 40 includes a drive plate 42 provided with a clutch shoe 44 and a clutch outer 41 that is driven to rotate by the frictional resistance of the clutch shoe 44. The drive plate 42 is fixed to the left end of the motor drive shaft 53 in the figure, while the clutch outer 41 is fixed to the output shaft 43 that is rotatably inserted into the motor drive shaft 53 by a nut 66. Yes. The motor drive shaft 53 and the output shaft 43 are configured to be mutually rotatable by two needle roller bearings 75 and 76.

  In the centrifugal clutch 40, when the motor drive shaft 53 reaches a predetermined rotation or more, that is, when the drive plate 42 reaches a predetermined rotation or more, the clutch shoe 44 moves radially outward to generate a frictional resistance force. The clutch outer 41 is configured to be driven to rotate. Thereby, the rotational driving force of the electric motor 50 is transmitted to the output shaft 43.

  The rotational driving force transmitted to the output shaft 43 is transmitted to the final output shaft 48 (axle 19) via the speed reduction mechanism 70. Specifically, a first reduction gear 46 that meshes with a reduction gear 43 a formed at the right end of the output shaft 43 in the figure, and a bearing 79 that is fixed to the first reduction gear 46 and fitted in a reduction gear case 67. And a first reduction shaft 45 that is rotatably supported by a bearing 78 fitted to the transmission case 68, and a second reduction gear 47 that meshes with a reduction gear 45a formed on the first reduction shaft 45, It is fixed to the second reduction gear 47 and transmitted to a final output shaft 48 that is rotatably supported by a bearing 80 fitted to the transmission case 68 and a bearing 82 fitted to the reduction gear case 67. It becomes.

  A wheel 56 of the rear wheel WR is fixed to the right output end of the final output shaft 48 with a nut 72 via a collar 69. A brake drum having a liner 85 is formed on the inner diameter side of the wheel 56, and a pair of upper and lower brake shoes 83 driven by the brake cam 49 around the anchor pin 84 are housed inside the brake drum. An oil seal 81 is disposed on the left side of the bearing 82 in the figure. An integral swing arm case 12a is attached to the outside of the smoothing capacitor 36 and the centrifugal clutch 40 in the vehicle width direction.

  Next, a drive control device for an electric vehicle including the discharge control device of the present invention will be described with reference to the block diagrams of FIGS. FIG. 5 is a block diagram of the drive control device with the main switch 110 closed, and FIG. 6 is a block diagram of the drive control device with the main switch 110 open.

  The drive control device includes a low voltage battery (sub battery) 30 that generates a low voltage (12V) for a control device, a high voltage battery (main battery) 31 that generates a high voltage (72V) for a drive motor, An electric motor 50 driven based on a voltage supplied from a voltage battery (main battery) 31 and an inverter circuit 350 for converting a DC voltage supplied from the high voltage battery (main battery) 31 into an AC voltage are provided. A drive unit (motor driver) 35 that drives the motor 50 and an MGU (control device) 34 that controls the drive unit (motor driver) 35 are configured.

  A high voltage (72 V) from the high voltage battery (main battery) 31 is supplied to the inverter circuit 350 of the drive unit (motor driver) 35, and between the high voltage battery (main battery) 31 and the inverter circuit 350. A smoothing capacitor 36 that absorbs voltage fluctuations by smoothing the direct-current voltage exchanged is connected.

  The electric motor 50 is driven by a three-phase AC voltage (U-phase wiring 27, V-phase wiring 28, and W-phase wiring 29) obtained by converting a DC voltage from a high-voltage battery (main battery) 31 by an inverter circuit 350.

The high voltage battery (main battery) 31 is connected to a power converter (DC-DC converter) via a relay switch (switch means) 120 that is turned on / off by a contactor operation based on an on / off operation of the main switch 50. Down circuit) 32 and a lighting device 90. The power converter (DC-DC converter: downconverter) 32 is connected to a drive unit (motor driver) 35 and an MGU (control device) 34.
The relay switch (switch means) 120 is relay-controlled so that the contactor operation is turned on and closed when the main switch 110 is turned on, and the contactor operation is turned off and opened when the main switch 110 is turned off.
In the power converter (DC-DC converter: down converter) 32, the output voltage (72V) of the high voltage battery (main battery) 31 is stepped down to 12V by the DC / DC converter, and the stepped down voltage is MGU (control device) 34 and While being supplied to the drive part (motor driver) 35 side, it is applied to the low voltage battery (sub battery) 30 and the low voltage battery (sub battery) 30 is charged.

  The high voltage battery (main battery) 31 is connected to the charger 310, and charging the high voltage battery (main battery) 31 by connecting the charger 310 to a household commercial power source (external power source) via the outlet 320. Is done.

  The high-voltage battery (main battery) 31 includes a battery management board (BMU) 330, monitors the charging status by the charger 310, and receives a signal from CAN communication from the MGU (control device) 34 to receive a low-voltage battery. (Sub-battery) 30 is configured to monitor the state of charge.

  The low-voltage battery (sub-battery) 30 is connected to a general electrical equipment 150 including a turn signal, a stop lamp, a horn, a meter, and the like via a main switch 110, and supplies a 12V voltage when the main switch 50 is turned on. These devices are set to be operable (lighted). The low-voltage battery (sub-battery) 30 supplies 12 V to a power converter (DC-DC converter: down converter) 32 to operate the power converter (DC-DC converter: down converter) 32, and It is also connected to a drive unit (motor drive) 35 and an MGU (control device) 34 to supply a 12V voltage as an auxiliary power source.

For the smoothing capacitor 36 connected to the inverter circuit 350 of the drive unit (motor drive) 35, a 12V lamp 90 composed of the headlamp 10 and the tail lamp device 16, and a power converter (DC-DC) A circuit means 100 composed of a converter (down converter) 32 is connected. By connecting the power converter (DC-DC converter: down converter) 32, the voltage generated by the smoothing capacitor 36 can be converted into the voltage supplied to the electrical load of the electric vehicle.
The 12V lamp 90 includes a headlight 91 mounted on the front portion of the electric motorcycle in which the high beam 91a and the low beam 91b are selected by the switch 92, a taillight 93 mounted on the rear portion of the electric motorcycle, And a position light 94 arranged in the vicinity of the light. The high beam 91a or the low beam 91b constituting the headlight (91) of the lighting device (90) is configured such that one of the high beam 91a or the low beam 91b is always lit when the main switch (110) is on.
The light emitting diode 95 connected in parallel to the high beam 91a of the headlight 91 is an indicator lamp that is lit in the meter unit 8 when the high beam is selected. Since the headlight 91 requires illuminance as compared with the taillight 93, a headlight 91 having a large resistance value (load) is used.

Further, since the lighting device 90 is connected to the smoothing capacitor 36 connected to the inverter circuit 350 of the drive unit (motor drive) 35 via the power converter (DC-DC converter: down converter) 32, smoothing is performed. The electric charge charged in the capacitor 36 can be discharged via the power converter (DC-DC converter: down converter) 32.
At that time, the voltage supplied to the lighting device 90 is stepped down from a high voltage (72 V) to a low voltage (12 V) by a power converter (DC-DC converter: down converter) 32, so that a standard that is normally used is used. A lamp with a rated voltage of 12 V can be used.

  The MGU (control device) 34 includes a TH sensor (throttle opening sensor) 341 for detecting the throttle opening degree, a stand switch 342 for detecting the raising / lowering state of the center stand 18, and a seat switch 343 for recognizing whether the driver gets on the vehicle. The control signal is input, and the voltage of the high voltage battery (main battery) 31 is monitored, and the detected value of the TH sensor (throttle opening sensor) 341 and the motor rotation speed sensor 72 of the electric motor 50 is determined. The drive of the electric motor 50 is controlled by performing energization control of the inverter circuit 350 of the drive unit (motor driver) 35.

Next, the operation of the above-described discharge control device will be described.
When the main switch 110 is turned on and the closed state as shown in FIG. 5 is established, the relay switch (switch means) 120 is turned on, and current flows from the high voltage battery (main battery) 31 along the path shown by the dotted line in FIG. Based on the voltage supplied via the power converter (DC-DC converter: down converter) 32, the 12V lamp 90 is turned on, and the electric motor is supplied via the drive unit (motor driver) 35. 50 becomes a drivable state. The general electrical equipment 150 is supplied with 12V voltage from the low voltage battery (sub battery) 30 via the main switch 110, and these equipment can be operated (lighted).

  If a start switch (not shown) is turned on in this state, the electric motor 50 is started, and the DC voltage from the high voltage battery (main battery) 31 is converted into a three-phase AC voltage by the inverter circuit 350. The electric motor 50 is driven. At that time, the electric charge is charged in the smoothing capacitor (power storage means) 36 mainly intended to absorb the fluctuation of the power supply voltage connected to the input side of the inverter circuit 350.

  When the main switch 110 is turned off and the open state as shown in FIG. 6 is established, the relay switch (switch means) 120 is turned off, and the high voltage battery (main battery) 31 to the power converter (DC-DC converter: down converter). The electric power supply to the lighting device 90 via 32 and the electric power supply to the electric motor 50 via the drive unit (motor driver) 35 are cut off, and charging to the smoothing capacitor 36 side is cut off. .

  Then, the electric charge charged in the smoothing capacitor 36 passes through a power converter (DC-DC converter: down converter) 32 through a path indicated by a dotted line in FIG. 6 and lights (headlight 91, taillight 93 and position light). 94) It flows to the 90 side, the discharged voltage is applied to the lighting device 90, and the lighting device 90 is turned on to discharge.

  Accordingly, when the electric vehicle is “running”, “running stop”, or when the main switch 110 is opened “main switch off”, the electric charge of the smoothing capacitor 36 flows to the lamp 90 side. When “output to (headlight)” is “system down” when the discharge by the discharge control device is completed, (1) “downREG” indicating the presence / absence of output from the power converter (DC-DC converter: downconverter) 32 H / L output ”, (2)“ general electrical output ”indicating the presence or absence of output to the general electrical equipment 150, (3)“ contactor operation ”indicating the operation status of the relay switch 120, (4) discharge control device FIG. 7 shows the “system startup or down” state indicating the startup state of the drive control device including the drive control device.

That is, when the electric vehicle 1 is “running”, the main switch 110 and the relay switch (switch means) 120 are in a closed state, so that “DownREG H / L output” is “ON” (present). , “General electrical equipment output” is “ON” (present), relay switch (switch means) 120 is closed, so “Contactor operation” is “ON”, “System activation or down” is activated It is in the state of.
When the travel of the electric vehicle 1 is stopped “travel stop”, the above state is maintained only by the electric motor 50 being stopped.

When the main switch 110 is turned off, the 12V voltage supply to the general electrical equipment 150 is cut off from the above state, so the “general electrical output” is in the “OFF” (none) state. At the same time, the “contactor operation” is in the “OFF” state, the relay switch (switch means) 120 is opened, and the voltage supply from the high voltage battery (main battery) 31 is cut off. Therefore, “DownREG H / L output” is maintained in the “ON” (present) state.
When the discharge control device completes discharging of the charge accumulated in the smoothing capacitor 36, all of "DownREG H / L output", "General electrical equipment output", and "Contactor operation" are turned off. .

  In the case of a motorcycle, a 12V voltage is supplied when the main switch 110 is turned on in order to turn on the lamps (headlight 91, taillight 93 and position light 94) 90 during daytime running. Accordingly, when the main switch 110 is turned off, the voltage supply from the high voltage battery (main battery) 31 is cut off, but the electric charge accumulated in the smoothing capacitor 36 is converted into a power converter (DC-DC converter: The 12V voltage is supplied by flowing through the down converter 32.

  In this example, when the smoothing capacitor 36 is discharged, the current flows through all the lamps 90 of the headlight 91, the taillight 93, and the position light 94. However, any of the headlight 91, the taillight 93, or the position light 94 is used. Alternatively, the current may flow through one. In addition, by including the headlight 91 in the lighting device 90 through which the discharge current flows, it is possible to use a resistor with a large load (a load with large power consumption), so that the charge of the smoothing capacitor 36 can be discharged early.

  Further, an indicator (not shown) that is turned on when discharging to the lighting device 90 is provided in the meter unit 8 of the electric vehicle 1 in order to inform the driver of the electric vehicle that the lighting device 90 such as the headlight 91 is discharged. You may make it provide in. With this configuration, the driver can recognize that the lighting of the lighting device 90 after turning off the main switch 110 is due to discharge.

  DESCRIPTION OF SYMBOLS 1 ... Electric vehicle, 9 ... Front cowl, 9a ... Step floor part, 10 ... Headlight, 12 ... Swing arm, 14 ... Seat, 16 ... Taillight device, 19 ... Rear-wheel axle, 30 ... Low voltage battery (sub battery) ), 31 ... high voltage battery (main battery), 32 ... power converter (DC-DC converter: down converter), 34 ... MGU (control device), 35 ... drive unit (motor driver), 36 ... smoothing capacitor, 50 DESCRIPTION OF SYMBOLS ... Electric motor, 90 ... Light fixture, 91 ... Headlight, 93 ... Taillight, 94 ... Position light, 100 ... Circuit means, 110 ... Main switch, 120 ... Relay switch (switch means), 150 ... General electrical equipment, 310 ... charger, 350 ... inverter circuit, WR ... rear wheel.

Claims (6)

The battery (31), the electric motor (50) that can be driven based on the voltage supplied from the battery (31) by turning on the main switch (110), and the direct current supplied from the battery (31) A drive unit (35) having an inverter circuit (350) for converting a voltage into an alternating voltage and driving the electric motor (50); a control device (34) for controlling the drive unit (35); An electric vehicle comprising a smoothing capacitor (36) that is connected to an inverter circuit (350) and absorbs voltage fluctuations by smoothing a DC voltage exchanged between the battery (31) and the inverter circuit (350). In
When the main switch (110) is turned off, circuit means (100) for supplying electric charge accumulated in the smoothing capacitor (36) to a lighting device (90) provided in the electric vehicle is provided with the smoothing capacitor (36). A discharge control device for an electric vehicle characterized by being connected to the electric vehicle. The circuit means (100) comprises:
The discharge control device for an electric vehicle according to claim 1, further comprising a power converter (32) for converting a voltage generated by the smoothing capacitor (36) into a voltage supplied to an electric load of the electric vehicle. . The discharge control device for an electric vehicle according to claim 1 or 2, wherein the lighting device (90) is a headlight (91) that is always lit when at least the main switch (110) is turned on. Switch means (120) that is turned on and off in response to the main switch (110) between the battery (31) and the drive unit (35),
The power converter (32) is connected by a line between the switch means (120) and the drive unit (35), and when the switch means (120) is off, the smoothing capacitor (36) When the switch means (120) is on, the power of the battery (31) is dropped to control the drive unit (35) and the control. 4. The discharge control device for an electric vehicle according to claim 3, wherein the power supply of the device (34) is supplied. The electric vehicle includes a sub-battery (30) for electric load of the vehicle,
The power converter (32) is operated by being supplied with electric power from the sub-battery (30), and also supplies electric power as an auxiliary power source for the drive unit (35) and the control device (34). The discharge control apparatus in the electric vehicle according to claim 4. The electric vehicle includes a step floor portion (9a) in front of the seat (14),
The electric motor (50) is provided in the vicinity of the rear wheel axle (19) at the rear of the swing arm (12) that supports the rear wheel (WR).
The battery (31) is disposed on the step floor (9a),
The smoothing capacitor (36) is provided at the rear of the battery (31) and at the front of the swing arm (12),
The discharge control device for an electric vehicle according to claim 2, wherein the power converter (32) is provided under a seat (14) between the battery (31) and the smoothing capacitor (36).

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