JP2014050131A - Electric power management device and method - Google Patents

Abstract

Power management can be performed more appropriately when or after any one of a plurality of battery units connected in parallel is disconnected from the remaining battery units.
An electric vehicle ECU functions as a power management device that manages the exchange of power between a power storage device having first and second battery units connected in parallel and a motor or an inverter as a power device. When one of the first and second battery units 41, 42 is disconnected from the other, feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii for the output limit Wout and the input limit Win as parameters for power management are used. And the integral term of ΔWiv is set to 0 (step S210).
[Selection] Figure 2

Description

  The present invention relates to a power management apparatus and method for managing the exchange of power between a power storage device having a plurality of battery units connected in parallel and a power device.

  Conventionally, as this type of power management apparatus, a first current value flowing through a first battery pack (battery unit) and a second current flowing through a second battery pack connected in parallel to the first battery pack First and second trajectory lengths indicating the lengths of trajectories whose values have changed on the current axis are calculated, and each of the first and second battery packs is calculated based on the first and second trajectory lengths. A device that detects that one of the current interrupting devices (CID) provided in the device is activated is known (see, for example, Patent Document 1). When this power management device detects that any one of the current interrupting devices is activated due to an abnormality occurring in any of the first and second battery packs, the power management device replaces the battery pack in which the current interrupting device is activated with another One of a plurality of relays is controlled so as to be disconnected from the battery pack.

  Also, as this type of power management device, a power limit value calculation unit that calculates an output power limit value indicating power that can be output from a power storage unit including a plurality of power storage devices (battery units) connected in parallel, and When at least one detection value of the plurality of first current sensors that detect the input / output current of the corresponding power storage device and the second current sensor that detects the input / output current of the power storage unit exceeds a predetermined threshold, There is also known one including a feedback control unit that executes excess current feedback control for correcting the output power limit value based on the excess amount (see, for example, Patent Document 2).

JP 2012-138278 A JP 2012-060787 A

  In a power storage device having a plurality of battery units connected in parallel as described above, when a battery unit in which an abnormality has occurred is disconnected from another battery unit, power management fails during or after the battery unit is disconnected. It is necessary to set parameters for power management so as not to cause problems. However, Patent Documents 1 and 2 do not disclose any setting of parameters for power management when disconnecting a battery unit in which an abnormality has occurred.

  Therefore, a main object of the power management apparatus and method according to the present invention is to enable more appropriate power management during or after disconnecting any one of a plurality of battery units connected in parallel.

  The power management apparatus and method according to the present invention employ the following means in order to achieve the main object.

The power management apparatus according to the present invention includes:
In a power management device that manages the exchange of power between a power storage device having a plurality of battery units connected in parallel and a power device,
When any one of the plurality of battery units is disconnected from the remaining battery units, the integral term of the feedback correction amount for the power management parameter or the learning value for power management is set to 0.

  The power management device manages power exchange between a power storage device having a plurality of battery units connected in parallel and a power device, and any one of the plurality of battery units is a remaining battery unit. When the power management parameter is disconnected, the integral value of the feedback correction amount for the power management parameter or the learning value for power management is set to 0. In this way, parameters or learning values that do not match the actual situation are used by preventing the integral term of the feedback correction amount and the learning value from being taken over as they are during or after the separation of any one of the battery units. It is possible to suppress power management. Therefore, according to this power management apparatus, it becomes possible to more appropriately execute power management during or after disconnecting any one of the plurality of battery units.

  Further, the power management device sets discharge allowable power allowed for discharging of the power storage device, and uses a discharge-side feedback correction amount calculated based on at least a charge / discharge current of the power storage device as a discharge allowable power correction amount. When the discharge allowable power is corrected and any one of the plurality of battery units is disconnected from the remaining battery units, the discharge allowable power correction amount is set to 0 and the discharge side feedback correction amount is set. The integral term may be zero. As a result, it is possible to suppress the failure of power management during the disconnection of any one battery unit, and due to the influence of the integral term of the feedback correction amount accumulated before the disconnection of any one of the battery units, It is possible to supply sufficient power to the power supply target of the power storage device by suppressing the discharge allowable power from being restricted more than necessary after the battery unit is disconnected. Note that the charge / discharge current of the power storage device may include any or all of the discharge currents of the individual battery units.

  Furthermore, the electric power device may include an electric motor used as a driving power source for the electric vehicle and an inverter that drives the electric motor, and any one of the plurality of battery units is a remaining battery unit. When disconnecting from the motor, the torque command to the motor may be set to a value of zero. Thus, if any one of the plurality of battery units is disconnected from the remaining battery units and the torque command to the motor is set to the value 0, any one of the battery units can be connected without shutting down the inverter. It can be disconnected from the remaining battery unit. In this case, even if the torque command to the electric motor is set to the value 0, the current flowing through the electric motor does not necessarily become the value 0. However, when any one of the battery units is disconnected, the feedback correction amount By setting the integral term to a value of 0, even if a current flows through the motor, it is possible to satisfactorily suppress power management failure due to accumulation of the integral term.

  In addition, the power management device sets a charge allowable power allowed for charging the power storage device, and uses a charge-side feedback correction amount calculated based on at least a charge / discharge current of the power storage device as a charge allowable power correction amount. And correcting the charge allowable power using one of the plurality of battery units from the remaining battery unit, the charge allowable power correction amount is set to 0 and the charge side feedback correction amount is adjusted. The integral term may be zero. As a result, it is possible to suppress the failure of power management during the disconnection of any one battery unit, and due to the influence of the integral term of the feedback correction amount accumulated before the disconnection of any one of the battery units, It is possible to more appropriately charge the power storage device, that is, the remaining battery unit by suppressing the charging allowable power from being restricted more than necessary after the battery unit is disconnected. Also in this case, the charge / discharge current of the power storage device may include any or all of the discharge currents of the individual battery units.

The power management method according to the present invention includes:
In a power management method for managing the exchange of power between a power storage device having a plurality of battery units connected in parallel and a power device,
When any one of the plurality of battery units is disconnected from the remaining battery units, the method includes a step of setting the integral term of the feedback correction amount for the power management parameter or the learning value for power management to a value of zero.

  According to this method, it becomes possible to more appropriately execute power management during or after disconnecting any one of the plurality of battery units.

It is a schematic block diagram which shows the electric vehicle 20 which is an example of the vehicle provided with the electronic control apparatus as a power management apparatus by this invention. 7 is a flowchart illustrating an example of an input / output restriction correction routine.

  Next, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an electric vehicle 20 which is an example of a vehicle including an electronic control device as a power management device according to the present invention. An electric vehicle 20 shown in the figure includes a motor MG that can input and output power to a drive shaft 22 connected to a drive wheel DW, an inverter 30 for driving the motor MG, and the motor MG and electric power via the inverter 30. And an electronic control unit (hereinafter referred to as “ECU”) 50 for controlling the entire vehicle.

  As shown in FIG. 1, the drive shaft 22 is connected to the left and right drive wheels DW via a differential gear 24 and the like. The motor MG is a known synchronous generator motor having a rotor in which a permanent magnet is embedded and a stator around which a three-phase coil is wound. The inverter 30 has, for example, six transistors (not shown) as switching elements and six diodes (not shown) connected in parallel to these transistors in the reverse direction. The power storage device 40 includes a first battery unit 41 and a second battery unit 42 connected in parallel. In the present embodiment, the first and second battery units 41 and 42 are assembled batteries (battery packs) configured by connecting a plurality of unit cells, for example, lithium ion secondary batteries or nickel hydride secondary batteries in series. It is. However, the first and second battery units 41 and 42 may be configured by capacitors or the like instead of the secondary battery.

  As shown in FIG. 1, the power storage device 40, that is, the first and second battery units 41, 42 include a positive line PL connected to the positive electrode of the inverter 30, a negative line NL connected to the negative electrode of the inverter 30, and a plurality of relays. It is electrically connected to the inverter 30 through 43, 44, 45 and 46. One end of the relay 43 is connected to the positive terminal of the first battery unit 41, and the other end is connected to the positive line PL. One end of the relay 44 is connected to the positive terminal of the second battery unit 42, and the other end is connected to the positive line PL. One end of the relay 45 is connected to a connection node between the negative terminals of the first and second battery units 41 and 42, and the other end is connected to the negative line NL. One end of the relay 46 is connected to a connection node between the negative terminals of the first and second battery units 41 and 42, and the other end is connected to the negative line NL via the precharging resistor R. Thus, when relays 43 and 44 and relay 45 or 46 are turned on, first and second battery units 41 and 42 are connected in parallel to each other and to inverter 30 in parallel. become. If either one of the relays 43 and 44 is turned off, one of the first and second battery units 41 and 42 corresponding to one of the turned off relays 43 and 44 is connected to the other (and the inverter 30 and the motor MG). Can be separated.

  In addition to the inverter 30 and the motor MG, the power storage device 40 is connected to an electric device such as a DC / DC converter 31 and a compressor constituting the vehicle interior air conditioner 35 as shown in FIG. The DC / DC converter 31 is connected to a low voltage system (not shown) including an auxiliary battery (low voltage battery) and connected to a plurality of auxiliary machines. Each of the DC / DC converters 31 includes a switching element, a transformer, and the like (not shown), and by turning on and off the switching element, the power from the power storage device 40 is stepped down to a low voltage system, that is, an auxiliary battery or a plurality of auxiliary machines It can be supplied. Note that a boost converter is provided between the inverter 30 and the power storage device 40 to boost the voltage from the power storage device 40 and supply the boosted voltage to the inverter 30 and to reduce the voltage from the inverter 30 and supply the power to the power storage device 40. May be.

  The ECU 50 is configured as a microcomputer centered on a CPU, and includes, in addition to the CPU, a ROM for storing various control programs, a RAM for temporarily storing data, an input / output port (all not shown), and the like. . The ECU 50 includes an ignition signal from an ignition switch (start switch) 51, a shift position SP from a shift position sensor 53 that detects a shift position corresponding to the operation position of the shift lever 52, and an accelerator that detects the amount of depression of the accelerator pedal 54. The accelerator opening (accelerator operation amount) Acc from the pedal position sensor 55, the vehicle speed V from the vehicle speed sensor 58, and the like are input via the input port.

  Further, the ECU 50 is configured as a microcomputer centering on a CPU (not shown), and electronic brake control for controlling a hydraulic brake device (not shown) capable of applying a friction braking force to the drive wheels DW and other wheels (not shown). It communicates with a unit (hereinafter referred to as “brake ECU”) 60 and exchanges various signals and data with the brake ECU 60. As shown in the figure, a brake pedal stroke BS from a brake pedal stroke sensor 57 that detects the depression amount of the brake pedal 56 is input to the brake ECU 60 via an input port. When the brake pedal 56 is depressed by the driver, the brake ECU 60 calculates the pedal depression force applied to the brake pedal 56 by the driver based on the brake pedal stroke BS from the brake pedal stroke sensor 57, and uses the calculated pedal depression force. Based on this, the required braking force requested by the driver is set. Then, the brake ECU 60 sets the required regenerative braking torque for the motor MG using the set required braking force, the vehicle speed V, and the regenerative distribution ratio setting map prepared in advance, and transmits the set required regenerative braking torque to the ECU 50. At the same time, the hydraulic brake device is controlled to output a friction braking force corresponding to the share.

  Further, the rotor rotational position from the rotational position detection sensor 70 that detects the rotational position of the rotor of the motor MG is input to the ECU 50 via the input port, and the ECU 50 is based on the rotor rotational position from the rotational position detection sensor 70. Then, the electrical angle, rotational angular velocity, rotational speed Nm, etc. of the rotor of the motor MG are calculated. Further, the ECU 50 is connected to the charge / discharge current Ib1 of the first battery unit 41 detected by the first current sensor 71 connected to the positive terminal of the first battery unit 41 and the positive terminal of the second battery unit 42. The second current sensor 72 detects the charge / discharge current Ib2 of the second battery unit 42 and the third current sensor 73 connected to the connection node between the positive terminals of the first and second battery units 41, 42. The charge / discharge current Ibt of the power storage device 40 is input. Furthermore, the ECU 50 is installed between the terminals of the first battery unit 41 and the terminal V2 of the second battery unit 42 detected by the first voltage sensor 74 installed between the terminals of the first battery unit 41. The voltage Vb2 between the terminals of the second battery unit 42 detected by the second voltage sensor 75, and between the terminals of the power storage device 40 detected by the third voltage sensor 76 installed between the positive electrode line PL and the negative electrode line NL. The voltage Vbt is input.

  Then, the ECU 50 outputs a switching control signal to the transistors of the inverter 30 and the DC / DC converter 31 via the output port. ECU 50 calculates remaining capacity SOC indicating the charging rate of power storage device 40 based on the integrated value of charging / discharging currents Ib1 and Ib2, or the temperature of power storage device 40 detected by the remaining capacity SOC and a temperature sensor (not shown). Based on Tb, output limit Wout as discharge allowable power (positive value) that is power allowed for discharge of power storage device 40 and charge allowable power (negative) that is power allowable for charge of power storage device 40 The input limit Win as a value) is calculated. Further, the ECU 50 corrects the output limit Wout to the decrease side (decreases the absolute value) and increases the input limit Win according to the values of the charge / discharge currents Ib1, Ib2, Ibt and the inter-terminal voltages Vb1, Vb2, Vbt. Correct the side (decrease the absolute value).

  When the electric vehicle 20 configured as described above travels, the ECU 50 uses the required torque setting map (not shown) to output the required torque Tr * () to be output to the drive shaft 22 corresponding to the accelerator opening Acc and the vehicle speed V. (Including braking torque when the accelerator is off). Further, at the time of vehicle braking in which the brake pedal 56 is depressed by the driver, the required regenerative braking torque from the brake ECU 60 is set as the required torque Tr *. Then, ECU 50 sets and sets torque command Tm * of motor MG such that torque according to required torque Tr * is output to drive shaft 22 within the range of output limit Wout and input limit Win of power storage device 40. The inverter 30 is subjected to switching control according to the torque command Tm * and the rotational speed Nm.

  Next, a procedure for correcting the output limit Wout and the input limit Win by the ECU 50 will be described. FIG. 2 is a flowchart showing an example of an input / output restriction correction routine executed by the ECU 50 every predetermined time after the ignition switch 51 is turned on.

  At the start of the input / output restriction correction routine of FIG. 2, the CPU (not shown) of the ECU 50 performs the output restriction Wout, the input restriction Win, the charge / discharge currents Ib1, Ib2 and Ibt from the first to third current sensors 71 to 73, the first. Execute input processing of necessary data such as the inter-terminal voltages Vb1, Vb2 and Vbt and the value of the battery disconnection flag Fbc from the third voltage sensors 74 to 76 (step S100). The output limit Wout and the input limit Win input in step S100 are separately set by the ECU 50 as described above and stored in a RAM (not shown).

  Further, the value of the battery disconnection flag Fbc is set separately by the ECU 50 and stored in a RAM (not shown). In the present embodiment, the ECU 50 sets the battery disconnection flag Fbc to a value of 0 when both the first and second battery units 41 and 42 are normal, and the first and second are detected by an abnormality detection device (not shown) or the like. When an abnormality in either one of the battery units 41 and 42 is detected, the battery disconnection flag Fbc is set to a value 1. Then, the ECU 50 sets the battery disconnection flag Fbc to a value of 0 when one of the first and second battery units 41 and 42 in which an abnormality has occurred is disconnected from the other. Here, in the electric vehicle 20 of the present embodiment, when one of the first and second battery units 41 and 42 in which an abnormality has occurred is separated from the other, the inverter 30 is shut down from the start to the completion of the separation. The torque command Tm * to the motor MG is set to the value 0.

  After the data input process in step S100, the ECU 50 corrects the output limit power feedback based on the charge / discharge currents Ib1, Ib2 and the inter-terminal voltages Vb1, Vb2 of the first and second battery units 41, 42 input in step S100. An amount (discharge-side feedback correction amount) ΔWop is calculated for each of the first and second battery units 41 and 42 (step S110). In step S110, the ECU 50 calculates the charge / discharge power Pb1 of the first battery unit 41 by multiplying the charge / discharge current Ib1 and the inter-terminal voltage Vb1, and also multiplies the charge / discharge current Ib2 and the inter-terminal voltage Vb2. After calculating the charge / discharge power Pb2 of the battery unit 42, it is determined whether or not the calculated charge / discharge power Pb1 and Pb2 exceed an upper limit side power threshold Pul that is a predetermined relatively large positive value. Then, the ECU 50 sets the output limit power feedback correction amount ΔWop to 0 for the charge / discharge power Pb1 and Pb2 that are equal to or less than the upper limit power threshold value Pul.

  Further, the ECU 50, for the charge / discharge power Pb1 and Pb2, which exceeds the upper limit power threshold Pul, according to the following equation (1), the excess amount of the charge / discharge power Pb1, Pb2 with respect to the upper limit power threshold Pul (Pb1- (Pul, Pb2-Pul) is calculated based on the output limited power feedback correction amount ΔWop. Expression (1) is a relational expression in feedback control (PID control) for setting the charge / discharge power Pb1 and Pb2 to be equal to or lower than the upper limit power threshold value Pul, and “kopp” in Expression (1) is a gain of a proportional term. Yes, “kopi” is the gain of the integral term, and “kopd” is the gain of the derivative term. Further, in the expression (1), “Pb (j)” indicates either the charge / discharge power Pb1 or Pb2. In the present embodiment, when the output limited power feedback correction amount ΔWop calculated according to the equation (1) is not included in the range of the predetermined upper limit guard value and lower limit guard value, the upper limit guard value or the lower limit guard is The output limit power feedback correction amount ΔWop is reset.

  ΔWop = kopp · (Pb (j) -Pul) + kopi · ∫ (Pb (j) -Pul) dt + kopd · d (Pb (j) -Pul) / dt (1)

  Next, ECU 50 calculates output limit current feedback correction amount (discharge-side feedback correction amount) ΔWoi based on charge / discharge current Ibt of power storage device 40 input in step S100 (step S120). In step S120, ECU 50 determines whether charge / discharge current Ibt of power storage device 40 exceeds upper limit side current threshold Iul, which is a predetermined relatively large positive value. Then, the ECU 50 sets the output limit current feedback correction amount ΔWoi to the value 0 when the charge / discharge current Ibt is equal to or less than the upper limit side current threshold value Iul.

  In addition, when the charge / discharge current Ibt exceeds the upper limit side current threshold value Iul, the ECU 50 outputs the output limiting current based on the excess amount (Ibt−Iul) of the charge / discharge current Ibt with respect to the upper limit side current threshold value Iul according to the following equation (2). A feedback correction amount ΔWoi is calculated. Expression (2) is a relational expression in feedback control (PID control) for setting the charging / discharging current Ibt to be equal to or lower than the upper limit current threshold Iul, and “koip” in Expression (2) is a gain of a proportional term, “Koii” is the gain of the integral term, and “koid” is the gain of the derivative term. In this embodiment, when the output limit current feedback correction amount ΔWoi calculated according to the equation (2) is not included in the range of the upper limit guard value and the lower limit guard value, the upper limit guard value or the lower limit guard is The output limit current feedback correction amount ΔWoi is reset.

  ΔWoi = koip ・ (Ibt-Iul) + koii ・ ∫ (Ibt-Iul) dt + koid ・ d (Ibt-Iul) / dt (2)

  Further, ECU 50 calculates output limit voltage feedback correction amount (discharge-side feedback correction amount) ΔWov based on inter-terminal voltage Vbt of power storage device 40 input in step S100 (step S130). In step S130, ECU 50 determines whether or not terminal voltage Vbt of power storage device 40 is lower than lower limit voltage threshold value Vll, which is a predetermined relatively large positive value. Then, the ECU 50 sets the output limit voltage feedback correction amount ΔWov to the value 0 when the inter-terminal voltage Vbt is equal to or higher than the lower limit side voltage threshold value Vll.

  Further, when the inter-terminal voltage Vbt is lower than the lower limit side voltage threshold value Vll, the ECU 50 outputs an output limiting voltage based on an excess amount (Vbt−Vll) of the interterminal voltage Vbt with respect to the lower limit side voltage threshold value Vll according to the following equation (3). A feedback correction amount ΔWov is calculated. Expression (3) is a relational expression in feedback control (PID control) for setting the inter-terminal voltage Vbt to be equal to or higher than the lower limit voltage threshold Vll, and “kovp” in the expression (3) is a gain of the proportional term, “Kovi” is the gain of the integral term, and “kovd” is the gain of the derivative term. In the present embodiment, when the output limit voltage feedback correction amount ΔWov calculated according to the equation (3) is not included within the predetermined upper limit guard value and lower limit guard value, the upper limit guard value or the lower limit guard is The output limit voltage feedback correction amount ΔWov is reset.

  ΔWov = kovp ・ (Vbt-Vll) + kovi ・ ∫ (Vbt-Vll) dt + kovd ・ d (Vbt-Vll) / dt (3)

  When the plurality of output limit power feedback correction amounts ΔWop, output limit current feedback correction amount ΔWoi, and output limit voltage feedback correction amount ΔWov are calculated in this way, the ECU 50 makes all the signs of the feedback correction amounts ΔWop, ΔWoi, and ΔWov positive. The maximum value among the plurality of output limit power feedback correction amounts ΔWop, output limit current feedback correction amount ΔWoi, and output limit voltage feedback correction amount ΔWov is set as the output limit correction amount ΔWout (step S140).

  Subsequently, the ECU 50 determines the input limited power feedback correction amount (charging-side feedback correction) based on the charging / discharging currents Ib1 and Ib2 and the terminal voltages Vb1 and Vb2 of the first and second battery units 41 and 42 input in step S100. (Amount) ΔWip is calculated for each of the first and second battery units 41 and 42 (step S150). In step S150, the ECU 50 calculates the charge / discharge power Pb1 of the first battery unit 41 by multiplying the charge / discharge current Ib1 and the inter-terminal voltage Vb1, and also multiplies the charge / discharge current Ib2 and the inter-terminal voltage Vb2. After calculating the charge / discharge power Pb2 of the battery unit 42, whether or not the calculated charge / discharge power Pb1 and Pb2 are below a lower limit power threshold value Pll that is a negative value having a relatively large absolute value set in advance. Determine. Then, ECU 50 sets the input limit power feedback correction amount ΔWip for the charge / discharge power Pb1 and Pb2 that is equal to or higher than the lower limit side power threshold value Pll to the value 0.

  Moreover, ECU50 is what exceeded the lower limit side electric power threshold value Pll among charging / discharging electric power Pb1 and Pb2, according to following Formula (4), and the excess amount (Pb1-) of charging / discharging electric power Pb1, Pb2 with respect to the lower limit side electric power threshold value Pll. An input limit power feedback correction amount ΔWip based on Pll, Pb2−Pll) is calculated. Expression (4) is a relational expression in feedback control (PID control) for setting the charge / discharge power Pb1 and Pb2 to the lower limit side power threshold value Pll or more, and “kipp” in the expression (4) is a gain of a proportional term. Yes, “kipi” is the gain of the integral term, and “kipd” is the gain of the derivative term. Further, in the expression (4), “Pb (j)” indicates either the charge / discharge power Pb1 or Pb2. In the present embodiment, when the input limit power feedback correction amount ΔWip calculated according to the equation (4) is not included in the range of the predetermined upper limit guard value and lower limit guard value, the upper limit guard value or the lower limit guard is It is reset as the input limit power feedback correction amount ΔWip.

  ΔWip = kipp · (Pb (j) -Pll) + kipi · ∫ (Pb (j) -Pll) dt + kipd · d (Pb (j) -Pll) / dt (4)

  Next, ECU 50 calculates an input limit current feedback correction amount (charging-side feedback correction amount) ΔWii based on charge / discharge current Ibt of power storage device 40 input in step S100 (step S160). In step S160, ECU 50 determines whether or not charging / discharging current Ibt of power storage device 40 is below lower limit side current threshold Ill, which is a negative value having a relatively large absolute value set in advance. Then, when the charge / discharge current Ibt is equal to or greater than the lower limit side current threshold value Ill, the ECU 50 sets the input limit current feedback correction amount ΔWii to a value of 0.

  Further, when the charge / discharge current Ibt is lower than the lower limit side current threshold value Ill, the ECU 50 determines the input limit current based on the excess amount (Ibt−Ill) of the charge / discharge current Ibt with respect to the lower limit side current threshold value Ill according to the following equation (5). A feedback correction amount ΔWii is calculated. Expression (5) is a relational expression in feedback control (PID control) for setting the charge / discharge current Ibt to be equal to or higher than the lower limit side current threshold value Ill, and “kiip” in the expression (5) is a gain of a proportional term. “Kiii” is the gain of the integral term, and “kiid” is the gain of the derivative term. In the present embodiment, when the input limit current feedback correction amount ΔWii calculated according to the equation (5) is not included within the predetermined upper limit guard value and lower limit guard value, the upper limit guard value or the lower limit guard is It is reset as the input limit current feedback correction amount ΔWii.

  ΔWii = kiip · (Ibt-Ill) + kiii · ∫ (Ibt-Ill) dt + kiid · d (Ibt-Ill) / dt (5)

  Further, ECU 50 calculates an input limit voltage feedback correction amount (charging-side feedback correction amount) ΔWiv based on terminal voltage Vbt of power storage device 40 input in step S100 (step S170). In step S170, ECU 50 determines whether or not voltage Vbt between terminals of power storage device 40 exceeds upper limit side voltage threshold value Vul that is a predetermined positive value. Then, the ECU 50 sets the input limit voltage feedback correction amount ΔWiv to the value 0 when the inter-terminal voltage Vbt is equal to or lower than the upper voltage threshold Vul.

  Further, when the inter-terminal voltage Vbt exceeds the upper limit voltage threshold Vul, the ECU 50 determines the input limit voltage based on the excess amount (Vbt−Vul) of the inter-terminal voltage Vbt with respect to the upper limit voltage threshold Vul according to the following equation (6). A feedback correction amount ΔWiv is calculated. Expression (6) is a relational expression in feedback control (PID control) for setting the inter-terminal voltage Vbt to be equal to or lower than the upper limit voltage threshold Vul, and “kivp” in Expression (6) is a gain of a proportional term. “Kivi” is the gain of the integral term, and “kivd” is the gain of the derivative term. In the present embodiment, when the input limit voltage feedback correction amount ΔWiv calculated according to the equation (6) is not included in the range of the predetermined upper limit guard value and lower limit guard value, the upper limit guard value or the lower limit guard is It is reset as the input limit voltage feedback correction amount ΔWiv.

  ΔWiv = kivp ・ (Vbt-Vul) + kivi ・ ∫ (Vbt-Vul) dt + kivd ・ d (Vbt-Vul) / dt (6)

  Thus, when the plurality of input limit power feedback correction amounts ΔWip, input limit current feedback correction amount ΔWii, and input limit voltage feedback correction amount ΔWiv are calculated, the ECU 50 sets the signs of the feedback correction amounts ΔWip, ΔWii, and ΔWiv to be negative. The minimum value among the plurality of input limit power feedback correction amounts ΔWip, input limit current feedback correction amount ΔWii, and input limit voltage feedback correction amount ΔWiv is set as the input limit correction amount ΔWin (step S180).

  After the process of step S180, the ECU 50 determines whether or not the battery disconnection flag Fbc input in step S100 is a value of 1, that is, whether or not the first or second battery unit 41, 42 has been disconnected. Is determined (step S190). When the battery disconnection flag Fbc is 0 and the first or second battery unit 41, 42 has not been disconnected, the ECU 50 outputs the output limit Wout input in step S100 set in step S140. The correction is made by the limit correction amount ΔWout, and the input limit Win input at step S100 is corrected by the input limit correction amount ΔWin set at step S180, and this routine is temporarily ended (step S220).

  In step S220, a value obtained by subtracting the output limit correction amount ΔWout set in step S140 from the output limit Wout input in step S100 is set as a new output limit Wout and input in step S100. A value obtained by subtracting the input restriction correction amount ΔWin set in step S180 from the input restriction Win is set as a new input restriction Win. Therefore, when the output limit correction amount ΔWout is set to a value other than 0 (positive value) in step S140, the output limit Wout is decreased on the side where the output of the power storage device 40 is limited in step S220. Will be corrected. If the input restriction correction amount ΔWin is set to a value other than 0 (negative value) in step S180, the input restriction Win is increased in step S220, that is, the charging of the power storage device 40 is restricted. Will be corrected.

  On the other hand, when it is determined in step S190 that the battery disconnection flag Fbc is 1 and the first or second battery unit 41, 42 is being disconnected, the ECU 50 determines the output limit correction amount ΔWout. The input limit correction amount ΔWin is reset to 0 (step S200), and the ECU 50 further outputs a plurality of output limit power feedback correction amounts ΔWop, an output limit current feedback correction amount ΔWoi, an output limit voltage feedback correction amount ΔWov, All integral terms of the plurality of input limit power feedback correction amounts ΔWip, input limit current feedback correction amount ΔWii, and input limit voltage feedback correction amount ΔWiv are set to 0 (cleared to zero) (step S210), and the process of step S220 is performed. Execute this routine. End the day. Accordingly, while the first or second battery unit 41, 42 is being disconnected, the output limit Wout and the input limit Win are not corrected, and the process of step S210 is performed, whereby the first Alternatively, before and after the separation of the second battery units 41 and 42, all the feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii, and ΔWiv integral terms are not taken over.

  As described above, the ECU 50 of the electric vehicle 20 generates electric power between the power storage device 40 having the first and second battery units 41 and 42 connected in parallel and the motor MG or the inverter 30 as a power device. It functions as a power management device that manages the exchange. The EC 50 sets the output limit correction amount ΔWout and the input limit correction amount ΔWin set as described above to the value 0 when any one of the first and second battery units 41 and 42 is disconnected from the other. At the same time (step S200), the integral values of the feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii, and ΔWiv for the output limit Wout and the input limit Win as parameters for power management are set to 0 (step S210). In this way, the integral terms of the feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii, and ΔWiv are not taken over as they are during or after the first or second battery unit 41, 42 is disconnected. It is possible to suppress power management using the output limit Wout and the input limit Win that do not match the above.

  That is, in the electric vehicle 20, it is possible to prevent the power management from failing during the disconnection of the first or second battery unit 41, 42, and to be accumulated before the first or second battery unit 41, 42 is disconnected. Due to the influence of the integral term of the feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii and ΔWiv, the output limit Wout is limited (reduced) more than necessary after the first or second battery unit 41, 42 is disconnected. Thus, it is possible to supply sufficient power to the motor MG that is the power supply target of the power storage device 40. Further, in the electric vehicle 20, the first or second feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii, and ΔWiv accumulated before the first or second battery unit 41, 42 is disconnected are influenced by the first or second. 2 It becomes possible to charge the power storage device 40 (remaining battery unit) more appropriately while suppressing the input restriction Win from being restricted (larger) than necessary after the battery units 41 and 42 are disconnected. Therefore, in the electric vehicle 20, it becomes possible to more appropriately execute power management during or after the first or second battery unit 41, 42 is disconnected.

  Further, as in the above embodiment, when one of the first and second battery units 41, 42 is disconnected from the other, the torque command Tm * to the motor MG is set to 0, without shutting down the inverter 30. Any one of the battery units can be separated from the remaining battery units. Thereby, it is not necessary to use an expensive insulated gate bipolar transistor (IGBT) or the like while having a high breakdown voltage as the transistor of the inverter 30, and the cost of the electric vehicle 20 can be reduced. In this case, even if the torque command Tm * to the motor MG is set to the value 0, the current flowing through the motor MG does not necessarily become the value 0, but the first or second battery unit 41, 42 When the disconnection is performed, the feedback correction amounts ΔWop, ΔWoi, ΔWov, ΔWip, ΔWii, and ΔWiv are set to a value of 0, so that even if a current flows through the motor MG, the integration of the integral terms causes failure in power management. Can be suppressed satisfactorily.

  Note that when any one of the first and second battery units 41 and 42 is disconnected from the other, integral terms such as feedback correction amounts ΔWoi and ΔWii with respect to the output limit Wout and the input limit Win as parameters for power management are set. In addition to or instead of 0, the learning value for power management may be 0. This prevents the learned value from being taken over as it is during or after the separation of the first or second battery unit 41, 42, and suppresses power management using a learned value that does not match the actual situation. It becomes possible.

  Further, although the embodiment of the present invention has been described so far as the vehicle to which the present invention is applied is an electric vehicle including only the motor MG as a generation source of traveling power, the vehicle to which the present invention is applied. In addition to an electric vehicle having one or a plurality of motors, it may be configured as a one-motor type or two-motor type hybrid vehicle including an internal combustion engine in addition to a motor as a driving power generation source. It may be configured as a system electric vehicle or a hybrid vehicle. Furthermore, the power storage device 40 may have three or more battery units. In addition, the functions of the ECU 50 may be distributed to a plurality of electronic control units, and power management such as setting and correction of the output limit Wout and the input limit Win described above may be performed by a single electronic control unit.

  The correspondence between the main elements of the above embodiment and the main elements of the invention described in the section for solving the problem is described in the section for the means for solving the problem by the embodiment. Since the embodiment for carrying out the invention is an embodiment for specifically explaining the invention, the elements of the invention described in the column of means for solving the problems are not limited. That is, the above embodiment is merely a specific form of the invention described in the section for solving the problem, and the interpretation of the invention described in the section for solving the problem is This should be done based on the description in the column.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention. .

  INDUSTRIAL APPLICABILITY The present invention can be used in the manufacturing industry of a power management device that manages the exchange of power between a power storage device and a power device.

  20 electric vehicle, 22 drive shaft, 24 differential gear, 30 inverter, 31 DC / DC converter, 35 passenger compartment air conditioner, 40 power storage device, 41 first battery unit, 42 second battery unit, 43, 44, 45, 46 Relay, 50 Electronic control unit (ECU), 51 Ignition switch, 52 Shift lever, 53 Shift position sensor, 54 Accel pedal, 55 Accel pedal position sensor, 56 Brake pedal, 57 Brake pedal stroke sensor, 58 Vehicle speed sensor, 60 For brake Electronic control unit (brake ECU), 70 rotational position detection sensor, 71 first current sensor, 72 second current sensor, 73 third current sensor, 74 first voltage sensor, 75 second voltage sensor, 76 third voltage Capacitors, MG motor, R resistance.

Claims (5)

In a power management device that manages the exchange of power between a power storage device having a plurality of battery units connected in parallel and a power device,
When any one of the plurality of battery units is separated from the remaining battery units, the integral value of the feedback correction amount for the power management parameter or the learning value for power management is set to 0. Management device. The power management apparatus according to claim 1,
The allowable discharge power allowed for the discharge of the power storage device is set, and the discharge allowable power is corrected using the discharge-side feedback correction amount calculated based on at least the charge / discharge current of the power storage device as the discharge allowable power correction amount. When disconnecting any one of the plurality of battery units from the remaining battery units, the discharge allowable power correction amount is set to 0 and the integral term of the discharge-side feedback correction amount is set to 0. A power management apparatus characterized by the above. The power management device according to claim 2,
The electric power device includes an electric motor used as a driving power source for an electric vehicle and an inverter that drives the electric motor,
The power management apparatus according to claim 1, wherein when any one of the plurality of battery units is separated from the remaining battery units, a torque command to the electric motor is set to a value of zero. In the power management device according to any one of claims 1 to 3,
The allowable charge power allowed for charging the power storage device is set, and the charge allowable power is corrected using the charge-side feedback correction amount calculated based on at least the charge / discharge current of the power storage device as the charge allowable power correction amount. When any one of the plurality of battery units is disconnected from the remaining battery units, the charge allowable power correction amount is set to 0 and the integral term of the charge-side feedback correction amount is set to 0. A power management apparatus characterized by the above. In a power management method for managing the exchange of power between a power storage device having a plurality of battery units connected in parallel and a power device,
A power management method including a step of setting an integral term of a feedback correction amount for a power management parameter or a learning value for power management to a value of 0 when any one of the plurality of battery units is separated from the remaining battery units. .

Images