JP2011194996A - Control device of electrically-driven vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device capable of being driven by driving a compressor for air conditioning of an electrically-driven vehicle over a wide operation region and reducing power consumption by selecting and controlling a rotating member interlocked with wheels and a motor for air conditioning as a driving source.SOLUTION: This control device includes: a request degree decision means 36 for deciding a driving request degree for the compressor 14 according to an air conditioning state of a vehicle; a driving source selection means 40 for setting a region where the driving source of the compressor is made as the rotating member 18 and a region where the driving source is made as the motor 22 for air conditioning according to vehicle speed and the driving request degree; an air conditioning control means 46 for controlling operations of a clutch 16 and the motor 22 for air conditioning to follow the setting of the driving source selection means 40 when operating an air conditioner in speed reduction of the vehicle; and a regeneration control means 48 for performing a control to make a motor 12 for traveling perform a regeneration operation and to reduce regeneration degrees in a region joined with the clutch 16 during speed reduction of the vehicle.

Description

  The present invention relates to a control device for an electrically driven vehicle, and more particularly to a control device for a compressor for air conditioning (for an air conditioner).

In an electrically driven vehicle driven by a motor generator, an air conditioning compressor does not have a mechanical drive source, and is therefore driven mainly by power supply from a battery. FIG. 5 shows an outline of a drive system for an air conditioning compressor in a conventional electrically driven vehicle.
In FIG. 5, the electrically driven vehicle 01 includes front wheels 02 and 02 and rear wheels 03 and 03, and a differential gear 07 is provided on the rear axle 05 on the rear wheel side. A motor generator 09 having both a function as a motor and a function as a generator for converting mechanical energy into electrical energy is attached.

  In addition, various electronic control units (ECUs) are provided as a control system, and each control unit is controlled by transmission / reception of a control signal from a vehicle control unit (EVECU) 011. Various ECUs include a motor control unit (MCU) 013 that controls the rotation, generated torque, and absorption torque of the motor generator 09, a battery control unit (BCU) 017 that controls the charge / discharge state of the battery 015, and an air conditioner 019. An air conditioning control unit (A / C ECU) 025 for controlling an air conditioning motor (A / C MOTOR) 023 for driving the compressor 021 is provided.

The motor control unit 013 controls the operation of the inverter 027, and the inverter 027 converts the DC power from the battery 015 to be supplied to the motor generator 09 as AC power, thereby controlling the rotation of the motor generator 09.
Further, the electric power from the battery 015 is supplied to the air conditioning inverter 029 that controls the rotation of the air conditioning motor 023 of the air conditioning device 019 so that the rotation of the compressor 021 is controlled.

  The electric energy of the battery 015 of the electric drive vehicle 01 configured as described above is either charged in the original state or stored by the regenerative electric power of braking (deceleration) energy during vehicle braking. For supplying regenerative energy to the compressor 021 for air conditioning of the vehicle 01, the mechanical energy at the time of deceleration is converted into electric energy as regenerative power of the motor generator 09, and is stored in the battery 015, and then supplied to the compressor 021. It was like that. In this case, there was a loss of energy conversion because it was once converted into electrical energy.

Therefore, a technique is known in which an air conditioning compressor (air conditioner pump) in an electrically driven vehicle is connected to a differential connecting shaft or the like and directly driven by deceleration energy. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2007-15524) is known. There is.
In Patent Document 1, as shown in FIG. 6, an engine 052 as a power source is provided on the front side of a vehicle 050, and a motor generator 054 as a power source is provided on the rear side. On the rear side of the vehicle, a motor generator 054 and an air conditioning compressor 058 are mechanically connected to the differential connecting shaft 056 via a power distribution device 060.
The air conditioner ECU 062 controls the driving of the compressor 058 so that the temperature of the evaporator constituting the air conditioner falls within a temperature range composed of a predetermined upper limit value and lower limit value. Further, when the vehicle is decelerating, a clutch 064 provided between the differential connecting shaft 056 and the compressor 058 is connected, and the compressor 058 is driven and controlled so that the evaporator temperature reaches a temperature range lower than the lower limit value. It is shown.

JP 2007-15524 A

  However, in the drive system for the compressor of the electrically driven vehicle disclosed in Patent Document 1, since the traveling motor is shared with the motor generator 054 as the drive source of the compressor 058, the motor generator 054 is used for regeneration at the time of deceleration. In the meantime, there is a problem that the compressor 058 cannot be operated, and the compressor 058 cannot be driven in a wide driving region of the vehicle. Therefore, the compressor 058 cannot be driven when necessary and the air conditioning performance is deteriorated when the cooling demand is high. There is a risk of inviting.

  Therefore, the present invention has been made in view of these problems, and a drive source for driving an air-conditioning compressor of an electrically driven vehicle is selected and controlled using a rotating member interlocking with a wheel and an air-conditioning motor as drive sources, respectively. Thus, an object of the present invention is to provide a control device for an electrically driven vehicle that can drive a compressor over a wide driving region of the vehicle and improve air conditioning performance by reducing power consumption.

  In order to solve the above-described problems, the present invention provides a travel motor, a compressor provided in a vehicle air conditioner, a clutch provided so as to transmit rotation of a rotating member interlocking with a wheel to the compressor, and the rotation. Apart from the members, an air conditioning motor provided to transmit the rotational driving force to the compressor, a deceleration state detecting means for detecting that the vehicle is decelerating, a vehicle speed detecting means for detecting the vehicle speed, and an air conditioning of the vehicle A request level determining means for determining a drive request level for the compressor according to a state, a region where the drive source of the compressor is the rotating member according to the vehicle speed and the drive request level, and a region where the air conditioning motor is used And a drive source selection means for setting the clutch and the front so as to follow the setting of the drive source selection means during operation of the air conditioner during vehicle deceleration. Air conditioning control means for controlling the operation of the air conditioning motor, and regenerative control means for controlling the regenerative operation of the travel motor when the vehicle decelerates and controlling the degree of regeneration in the region where the clutch is engaged. It is characterized by that.

  According to this invention, the request level determination means for determining the drive request level for the compressor according to the air conditioning state of the vehicle, and the drive source of the compressor is linked to the rotary member, that is, the wheel according to the vehicle speed and the drive request level. A drive source selection unit that sets a region for the drive shaft and a region for the air conditioning motor is selected, and according to the setting of the drive source selection unit, the drive source is selected during operation of the air conditioner in vehicle deceleration, Since the compressor is driven, the deceleration energy can be efficiently used for driving the compressor, the power consumption of the air conditioning motor can be suppressed, and the compressor can be driven in a wide driving range of the vehicle without difficulty.

  Moreover, in the region where the clutch is engaged by the regeneration control means, control is performed so as to reduce the degree of regeneration by the traveling motor, so that the total braking force when the compressor is not driven and the total braking force when the compressor is operated are controlled. A large change in power is suppressed and deterioration of braking feeling is prevented.

In the present invention, it is preferable that the drive source selection unit is set so that the drive region by the rotating member is expanded as the vehicle speed increases.
Thus, since the drive region by the rotating member is set to be widened on the high vehicle speed side where the deceleration energy increases, the deceleration energy can be efficiently used for driving the compressor.

In the present invention, it is preferable that the drive source selection unit is set so that an operation range of the air conditioning motor is expanded as the drive request level is increased.
In this way, the higher the drive requirement level, that is, the higher the requirement level for the cooling capability of the room temperature, is to expand the operating range of the air conditioning motor, so that the compressor can be driven regardless of the deceleration operation state of the vehicle. It is possible to respond quickly to requests.

In the present invention, it is preferable that the apparatus further includes a charging state determination unit that determines a charging state of the battery, and the driving source selection unit is set so that a driving region by the rotating member is expanded when the charging state becomes high. It is good to be.
Thus, when the battery is in a highly charged state, it becomes difficult to charge the battery due to regeneration. Therefore, the drive region by the rotating member, that is, the drive region by the drive shaft linked to the wheel is increased, and the deceleration energy is efficiently It can be used for compressor driving and power consumption of the air conditioning motor can be reduced.

  According to the present invention, the request level determination means for determining the drive request level for the compressor according to the air conditioning state of the vehicle, and the drive source of the compressor is linked to the rotating member, that is, the wheel according to the vehicle speed and the drive request level. A drive source selection unit that sets a region for the drive shaft and a region for the air conditioning motor is selected, and according to the setting of the drive source selection unit, the drive source is selected during operation of the air conditioner in vehicle deceleration, Since the compressor is driven, the deceleration energy can be efficiently used for driving the compressor, the power consumption of the air conditioning motor can be suppressed, and the compressor can be driven in a wide driving range of the vehicle without difficulty.

  Moreover, in the region where the clutch is engaged by the regeneration control means, control is performed so as to reduce the degree of regeneration by the traveling motor, so that the total braking force when the compressor is not driven and the total braking force when the compressor is operated are controlled. A large change in power is suppressed and deterioration of braking feeling is prevented.

It is explanatory drawing which shows the whole structure of a hybrid vehicle. It is a flowchart which shows the control flow in a control apparatus. It is explanatory drawing which shows the selection area | region of the motor for an air conditioning of a compressor, and a drive shaft drive, and shows the case where a battery filling state is inside. It is explanatory drawing which shows the selection area | region of the motor for an air conditioning of a compressor, and a drive shaft drive, and shows the case where a battery filling state is high and low. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

With reference to FIG. 1, the whole structure of the electrically driven vehicle 2 is demonstrated.
The electrically driven vehicle 2 includes front wheels 4 and 4 and rear wheels 6 and 6, and a differential device 10 is provided on the rear axle 8 on the rear wheel side, and the differential device 10 functions as a traveling motor. And a motor generator 12 having both a function as a generator for converting mechanical energy into electrical energy.
Further, the differential device 10 is provided with a clutch 16 that enables transmission and interruption of driving force to a compressor 14 provided in an air conditioner (air conditioner) 13. The air conditioner 13 shown in FIG. 1 shows only the compressor 14 portion.

  When the clutch 16 is turned on (engaged), the power from the differential 10, that is, the rotation of the rotating member 18 that is interlocked with the rotation of the rear wheels 6 and 6 during deceleration is transmitted to the compressor 14. Is supposed to drive. At the same time, the rotation from the rotating member 18 interlocked with the rotation of the rear wheels 6 and 6 is transmitted to the motor generator 12 as the driving source via the differential device 10. Therefore, when the clutch 16 is ON, the motor generator 12 generates electric power and the compressor 14 is activated by the regenerative energy during deceleration.

  The compressor 14 is a compressor provided in the on-vehicle air conditioner 13. The air conditioner 13 includes a condenser, a receiver, an expansion valve, an evaporator, etc. (not shown) in addition to the compressor 14. . The air conditioner 13 can be set by the air conditioner SW (switch) 20 with the indoor set temperature as a required temperature, and can be set and requested by an operator to an arbitrary temperature. At this time, the indoor temperature is detected by an indoor temperature sensor (not shown), and the required air conditioner is determined based on the required temperature by the air conditioner SW20 and the room temperature.

  In addition, an air conditioning motor 22 is attached to the compressor 14 so that the rotational driving force can be transmitted to the compressor 14. The rotation of the air conditioning motor 22 is controlled by an air conditioning inverter 24, and the air conditioning inverter 24 is controlled by an air conditioning control unit (A / CECU) 26.

  The configuration of the control system is provided with various electronic control units (ECUs), and each control unit is controlled by transmission / reception of a mutual control signal and the like with the vehicle ECU (control device) 28. Various ECUs include a motor control unit (MCU) 29 that controls the rotation, generated torque, and absorption torque of the motor generator 12, a battery control unit (BCU) 33 that controls the charge / discharge state of the battery 32, and the air conditioning described above. A control unit (A / CECU) 26 is provided.

The operation of the inverter 35 is controlled by a control signal from the motor control unit 29, and the DC power from the battery 32 is converted into AC power by the inverter 35 and supplied to the motor generator 12 to rotate and generate torque of the motor generator 12. The absorption torque is controlled.
The electric power from the battery 32 is supplied to the air conditioning inverter 24 so that the rotation of the air conditioning motor 22 is controlled. The air conditioning inverter 24 is controlled by the control signal from the air conditioning control unit 26 as already described.

  Next, the vehicle ECU 28 will be described. The vehicle ECU 28 includes a deceleration state for determining whether the vehicle is in a deceleration state based on a signal from the vehicle speed sensor 30 that is a vehicle speed detection means and a signal from the accelerator opening sensor 31. A determination unit 34 and an air conditioner request level determination unit 36 that determines a drive request level for the compressor 14 according to the air conditioning state of the vehicle, that is, the state of the required temperature by the air conditioner SW20 and the room temperature. Yes.

  Further, in accordance with the vehicle speed and the degree of drive demand for the compressor 14, the drive source of the compressor 14 is an area where the clutch 16 is turned on (joined) and driven by the rotation of the rotating member 18, that is, the deceleration energy of the vehicle. A drive source selection map 38 in which a region and a region to be driven by the air conditioning motor 22 are set in a map is provided, and a drive source selection means 40 for selecting a drive source according to the drive source selection map 38 is provided. I have.

  The drive source selection map 38 has different maps depending on the state of charge (SOC) of the battery 32. FIG. 3 is a first drive source selection map 38a in a normal state where the SOC is 40% to 60%, and FIG. 4 is a state where the SOC is low (less than 40%) and high (greater than 60%). The 2nd drive source selection map 38b in is shown.

Each drive source selection map 38a, 38b has a vehicle speed on the horizontal axis and an air conditioner request (A / C request) on the vertical axis, that is, a drive request level for the compressor 14. The line L is a boundary line between a region (drive shaft drive region) due to the rotational drive of the rotating member 18, that is, a region using regenerative energy when the vehicle is decelerated, and a drive (power drive region) by the air conditioning motor 22. is there.
For example, when the vehicle is traveling at the vehicle speed V1 and the air conditioner request level is A1, it is located at the point P, and therefore is in the power drive region, and is selected to be driven by the air conditioning motor 22 during deceleration during air conditioning operation.

The drive source selection map 38 is set so that the drive shaft drive area by the rotating member 18 is expanded as the vehicle speed increases. That is, the boundary line L is set so that Y shown in FIG. 3 increases as the vehicle speed increases.
Thus, since the drive shaft drive region by the rotating member 18 is set to be widened at the high vehicle speed side where the deceleration energy becomes large, the deceleration energy can be efficiently used for driving the compressor.

The drive source selection map 38 is set so that the electric drive area by the air conditioning motor 22 is expanded as the air conditioner request level (drive request level) increases. That is, the boundary line L is set so that the X shown in FIG.
As described above, the greater the required degree of the air conditioner, that is, the greater the required degree of the cooling capacity of the room temperature, the wider the operation area by the air conditioning motor 22 is. Since the compressor 14 can be driven by 22, it is possible to quickly respond to the cooling request.

  Moreover, based on the signal from the battery charge sensor 42 which detects the charge state of the battery 32, the charge state determination means 44 determines the charge state of the battery 32, and the charge state (SOC) of the battery 32 is 40% -60. When the SOC is low (less than 40%) or high (greater than 60%), the second drive source selection map 38b is used.

When the battery 32 is in a highly charged state, it becomes difficult to charge the battery 32 due to regeneration. Therefore, the drive shaft drive region can be increased, and the compressor 14 can be driven using the deceleration energy efficiently. Therefore, the state of charge of the battery 32 can be maintained at a high level.
Further, even when the battery 32 is in a low charge state, the power consumption of the air conditioning motor 22 is reduced so that the battery 32 is not further lowered from the low charge state.

Furthermore, an air conditioning control means 46 and a regeneration control means 48 are provided inside the vehicle ECU 28.
The air-conditioning control means 46 turns on (engages) the clutch 16 in the case of the drive shaft drive area in accordance with the drive area selected by the drive source selection means 40 when the air-conditioning device 13 is operated during vehicle deceleration. The motor 22 is turned off, and the driving is performed by the rotation of the rotating member 18 interlocked with the rotation of the rear wheels 6 and 6. In the power range, the clutch 16 is turned off (disconnected), the air conditioning motor 22 is turned on, and the air conditioning motor 22 is driven.

  The regenerative control means 48 regeneratively operates the traveling motor generator 12 when the vehicle is decelerated, and when the clutch 16 is turned on, the regenerative braking force using the decelerating energy by the motor generator 12 and the braking force by the compressor 14. Is controlled so as to reduce the degree of regeneration by the motor generator 12 so that the total braking force does not change significantly from the regenerative braking force by the motor generator 12 when the clutch 16 is not turned on.

A control flow by the vehicle ECU (control device) 28 having the above configuration will be described with reference to a flowchart of FIG.
First, when started, a signal from the accelerator opening sensor 31 and a signal from the vehicle speed sensor 30 are acquired in step S2. Next, in step S3, it is determined whether or not there is an air conditioner drive request. Whether there is an air conditioner drive request is determined by whether the air conditioner SW20 is turned on. If the switch is turned on, the process proceeds to step S4, and if the switch is OFF, the process proceeds to step S13 and returns.

  In step S4, based on the signals from the accelerator opening sensor 31 and the vehicle speed sensor 30 acquired in step S2, the deceleration state determination means 34 determines whether or not the vehicle is decelerating. If it is decelerating, it progresses to step S5, and if it is not decelerating, it progresses to step S13 and returns.

  In step S <b> 5, the state of the battery 32 is detected from the battery charge sensor 42, and the state of charge state is determined by the charge state determination unit 44. Then, the drive source selection means 40 determines whether it is the power drive region or the drive shaft drive region using one of the drive source selection maps 38a and 38b according to the state of charge. In this determination, the vehicle speed and the air conditioner request level are detected and determined using the drive source selection maps 38a and 38b. The vehicle speed is obtained from a signal from the vehicle speed sensor 30, and the air conditioner request level is obtained based on the determination result from the air conditioner request degree determining means 36.

  In step S6, it is determined whether it is a drive shaft drive region, and if it is determined that it is a drive shaft drive region, the process proceeds to step S10, and the operation of the clutch 16 is controlled by the air conditioning control means 46 so that the clutch 16 is operated. Turn it on. In step S11, the compressor 14 is driven by the rotation from the rotating member 18 that is interlocked with the rotation of the rear wheels 6 and 6, and the air conditioner 13 is operated. At this time, since the air conditioning motor 22 is stopped, power consumption can be saved.

  Next, in step S12, the regeneration control means 48 reduces the amount of regeneration of the motor generator 12 by the amount driven by the compressor 14, and the total braking force of the braking force generated by regeneration by the motor generator 12 and the braking force by the compressor 14 is achieved. However, the braking shock to the vehicle when the clutch 16 is actuated is reduced so as not to greatly change the regenerative braking force by the motor generator 12 when the clutch 16 is not turned on. Then, the process returns at step S13.

If it is determined in step S6 that the region is not the drive shaft drive region, that is, the power drive region, the process proceeds to step S7, the clutch is turned off, and the compressor is operated by the air conditioning motor 22 in step S8. 14 is driven. At this time, it is possible to quickly respond to an air conditioner request, for example, a large cooling request regardless of the deceleration operation of the vehicle.
In step S9, the normal regeneration amount is controlled by the motor generator 12, and the process returns in step S13. The control flow of the vehicle ECU (control device) 28 is executed at a predetermined time period.

  According to the embodiment as described above, the air-conditioner request degree determining means 36 determines the drive request degree for the compressor 14 according to the air-conditioning state of the vehicle, that is, the state of the required temperature by the air-conditioner SW20 and the room temperature. Accordingly, the drive request level for the compressor 14 is determined by the air conditioner request level determination means 36, and the drive source of the compressor 14 is driven by the rotation member 18, that is, the drive shaft linked to the wheel, from the request level and the vehicle speed. The compressor 14 is driven by selecting according to the drive source selection means 40 in which the shaft drive region and the power drive region for the air conditioning motor 22 are set, so that the deceleration energy can be efficiently utilized for driving the compressor 14. The power consumption of the air conditioning motor 22 can be reduced, and the compressor 14 can be driven comfortably in a wide driving range of the vehicle. It can be.

  Moreover, in the region where the clutch 16 is engaged by the regenerative control means 48, the regenerative degree by the motor generator 12 is controlled to be reduced, so that the total regenerative braking force when the compressor 14 is not driven and the compressor 14 are driven. In this case, it is possible to suppress a large change in the total braking force, and it is possible to reduce a shock that acts on the vehicle when the clutch 16 is ON, and to prevent deterioration of the braking feeling.

  According to the present invention, a compressor can be operated in a wide operating range of a vehicle by selectively controlling a rotating member that interlocks with a wheel as a driving source that drives a compressor for air conditioning of an electrically driven vehicle and an air conditioning motor. Since the air conditioning performance can be improved by driving over a wide range and driving with less power consumption, it is suitable for use in a control device for an air conditioning compressor of an electrically driven vehicle.

DESCRIPTION OF SYMBOLS 1 Electric drive vehicle 4 Front wheel 6 Rear wheel 10 Differential device 12 Motor generator (motor for driving)
13 Air Conditioner 14 Compressor 16 Clutch 18 Rotating Member 20 Air Conditioner SW
22 Air Conditioning Motor 28 Vehicle ECU (Control Device)
30 Vehicle speed sensor (vehicle speed detection means)
31 Accelerator opening sensor 32 Battery 34 Deceleration state determination means 36 Air conditioner request degree determination means (request degree determination means)
38 drive source selection map 40 drive source selection means 42 battery charge sensor 44 charge state determination means 46 air conditioning control means 48 regenerative control means

Claims (4)

  A driving motor, a compressor provided in a vehicle air conditioner, a clutch provided so that rotation of a rotating member interlocking with a wheel can be transmitted to the compressor, and a rotational driving force transmitted to the compressor separately from the rotating member An air conditioning motor provided in a possible manner, a deceleration state detecting means for detecting that the vehicle is decelerating, a vehicle speed detecting means for detecting the vehicle speed, and a degree of drive demand for the compressor according to the air conditioning state of the vehicle Demand level determination means, drive source selection means for setting a region where the compressor drive source is the rotating member and a region where the air conditioning motor is set according to the vehicle speed and the drive demand level, vehicle deceleration An air conditioning system for controlling the operation of the clutch and the air conditioning motor so as to follow the setting of the drive source selection means when the air conditioning apparatus is operated in And a regenerative control means for controlling the regenerative operation of the travel motor when the vehicle decelerates and reducing the regenerative degree in a region where the clutch is engaged. Control device.   2. The control device for an electrically driven vehicle according to claim 1, wherein the drive source selecting means is set such that a drive region by the rotating member is expanded as a vehicle speed increases.   2. The control device for an electrically driven vehicle according to claim 1, wherein the drive source selection unit is set so that an operation range of the air conditioning motor is increased as the degree of drive requirement increases.   The charge state determination means for determining the charge state of the battery is further provided, and the drive source selection means is set so that a drive region by the rotating member is expanded when the charge state becomes high. The control apparatus of the electrically driven vehicle of 1 or 2.

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