JP2010218976A - Driving device, method of determining abnormality thereof, and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more properly determine abnormality due to short-circuit in the battery module of a battery. <P>SOLUTION: When the residual capacity SOC of the battery is not less than a prescribed amount Sref to prohibit discharge of the battery, it is determined that abnormality due to short-circuit in a battery module Mx is caused (S220-S280) when a potential difference ▵Vxi between the voltage Vx of any one battery module Mx among a plurality of the battery modules M1-M4 and the voltage Vi of remaining battery module Mi is not less than a prescribed voltage Vref during discharge of the battery, and when the residual capacity SOC of the battery is less than the prescribed amount Sref, it is determined that abnormality due to short-circuit in the battery module Mx is not caused (S220) even when the voltage difference ▵Vxi is not less than the prescribed voltage Vref during discharge of the battery. Thus, incorrect determination can be suppressed, and abnormality due to short circuit in the battery module in the battery can be more properly determined. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drive device, an abnormality determination method thereof, and a vehicle.

  Conventionally, this type of drive device includes an assembled battery composed of a plurality of blocks in which a plurality of single cells are connected in series, and a motor generator that is driven using electric power from the assembled battery. An apparatus for determining an abnormality has been proposed (see, for example, Patent Document 1). In this device, the current of the assembled battery is sampled at the timing when the voltage of each block becomes a predetermined voltage, and the representative current value of each block is calculated based on the current group corresponding to each block sampled and stored. In consideration of the current-voltage characteristics of a block including a block including a single cell in which a micro short circuit has occurred at the time of discharging, the representative current value of one block is the representative current of another block when discharging the assembled battery. When there is a large variation from the value, it is determined that there is a high possibility that a minute short circuit has occurred in the single cell of that block, and so on.

JP 2008-288192 A

  However, in the assembled battery of the above-described driving device, there is a case where an abnormality due to a minute short circuit of the unit cell is erroneously determined. Normally, the amount of electricity stored in a single cell varies slightly from cell to cell due to individual differences due to manufacturing errors, aging, and temperature differences. The voltage drop of a specific block may occur due to the difference in the amount of stored electricity between the single cells, and this voltage drop may be erroneously determined as a micro short circuit as an abnormality on the hardware of the single cell. Further, when the driver is warned of the result of such an erroneous determination, the assembled battery is inspected or replaced in spite of the fact that no hardware abnormality has occurred.

  A main object of the drive device, the abnormality determination method, and the vehicle of the present invention is to more appropriately determine abnormality due to a short circuit in the battery module of the battery.

  The drive device, the abnormality determination method thereof, and the vehicle of the present invention employ the following means in order to achieve the main object described above.

The drive device of the present invention is
A battery formed by connecting a plurality of battery modules in which a plurality of cells as secondary batteries are connected in series, a driving device driven using power from the battery, and a dischargeable power storage of the battery Even when the remaining capacity, which is the capacity, is less than a predetermined amount that should prohibit the discharge of the battery, the power from the battery is used when a predetermined drive condition that prioritizes the drive of the drive device over the prohibition of the discharge of the battery is satisfied. A driving device control means for controlling the driving device so that the driving device is driven,
Voltage detection means for detecting the voltage of each of the plurality of battery modules;
When the remaining capacity of the battery is equal to or greater than the predetermined amount, the voltage of any one of the detected battery modules and the remaining of the detected battery modules when the battery is discharged When the voltage difference from the voltage of at least one battery module is greater than or equal to a predetermined voltage, it is determined that an abnormality has occurred due to a short circuit in the arbitrary one battery module, and the remaining capacity of the battery is less than the predetermined amount An abnormality determination means that sometimes does not determine an abnormality due to a short circuit in any one of the battery modules even when the voltage difference during discharging of the battery is equal to or greater than the predetermined voltage;
It is a summary to provide.

  In the driving device according to the present invention, even when the remaining capacity, which is a chargeable storage capacity of the battery, is less than a predetermined amount to be prohibited from discharging the battery, a predetermined driving condition that prioritizes driving of the driving device over prohibiting the discharging of the battery When is established, the drive device is controlled so that the drive device is driven using the electric power from the battery. When the remaining capacity of the battery is greater than or equal to a predetermined amount, the voltage of any one of the plurality of battery modules and the voltage of at least one remaining battery module among the plurality of battery modules when the battery is discharged Is determined to be abnormal due to a short circuit in any one of the battery modules. On the other hand, when the remaining capacity of the battery is less than the predetermined amount, even if the voltage difference at the time of discharging the battery is greater than or equal to the predetermined voltage, it is not determined as an abnormality due to a short circuit in any one battery module. Therefore, the drive device may be driven even when the remaining capacity of the battery is less than a predetermined amount, so the remaining capacity of the battery may be lower than the predetermined amount, and the dischargeable storage capacity of each cell is individual. Depending on the difference or state difference, polarity may occur in some cells due to battery discharge, but when the remaining battery capacity is less than a predetermined amount, the voltage difference during battery discharge is greater than or equal to a predetermined voltage. However, since it is not determined as an abnormality due to a short circuit in the battery module, an abnormality due to a short circuit in the battery module of the battery can be determined more appropriately.

  In such a driving apparatus of the present invention, the abnormality determination means may be means that does not determine abnormality due to the short circuit when the remaining capacity of the battery is less than the predetermined amount. In this way, unnecessary determination processing can be suppressed.

The vehicle of the present invention
The drive device of the present invention according to any one of the above-described aspects, that is, a battery formed by connecting a plurality of battery modules in which a plurality of cells serving as secondary batteries are connected in series; A drive device that is driven using electric power from a battery, and the drive device that is configured so as to prevent the battery from being discharged even when the remaining capacity, which is a dischargeable storage capacity of the battery, is less than a predetermined amount that should be prohibited from discharging the battery. Drive device control means for controlling the drive device so that the drive device is driven using the electric power from the battery when a predetermined drive condition giving priority to the drive of is established, Voltage detection means for detecting the voltage of each of the plurality of battery modules, and the detection when the battery is discharged when the remaining capacity of the battery is greater than or equal to the predetermined amount When the voltage difference between the voltage of any one of the plurality of battery modules and the voltage of at least one remaining battery module of the detected plurality of battery modules is equal to or greater than a predetermined voltage It is determined that an abnormality due to a short circuit in any one battery module has occurred, and when the remaining capacity of the battery is less than the predetermined amount, the arbitrary even when the voltage difference at the time of discharging the battery is equal to or greater than the predetermined voltage An abnormality determining means that does not determine that there is an abnormality due to a short circuit in one of the battery modules;
An internal combustion engine capable of outputting driving power;
A vehicle comprising:
The drive device is an electric motor capable of motoring the internal combustion engine,
The predetermined driving condition is a condition for starting the internal combustion engine with motoring of the internal combustion engine by the electric motor.
This is the gist.

  Since the vehicle of the present invention includes the drive device of the present invention according to any one of the aspects described above, it is possible to more appropriately determine the effects exhibited by the drive device of the present invention, for example, an abnormality due to a short circuit in the battery battery module. It is possible to achieve the same effects as the effects that can be achieved.

The abnormality determination method for the drive device of the present invention includes:
A battery formed by connecting a plurality of battery modules in which a plurality of cells as secondary batteries are connected in series, a driving device driven using power from the battery, and a dischargeable power storage of the battery Even when the remaining capacity, which is the capacity, is less than a predetermined amount that should prohibit the discharge of the battery, the power from the battery is used when a predetermined drive condition that prioritizes the drive of the drive device over the prohibition of the discharge of the battery is satisfied. A drive device control means for controlling the drive device so that the drive device is driven.
When the remaining capacity of the battery is greater than or equal to the predetermined amount, the voltage of any one of the plurality of battery modules and the remaining at least one battery module of the plurality of battery modules when the battery is discharged It is determined that an abnormality has occurred due to a short circuit in any one of the battery modules when the voltage difference from the voltage of the battery is greater than or equal to a predetermined voltage. When the remaining capacity of the battery is less than the predetermined amount, the battery is discharged Even when the voltage difference in is not less than the predetermined voltage, it is not determined as an abnormality due to a short circuit in the arbitrary one battery module,
It is characterized by that.

  In this abnormality determination method for a drive device according to the present invention, driving of a driving device is given priority over prohibition of battery discharge even when the remaining capacity, which is the chargeable storage capacity of the battery, is less than a predetermined amount that should prohibit battery discharge. In the drive device that controls the drive device so that the drive device is driven using electric power from the battery when the predetermined drive condition is satisfied, when the remaining capacity of the battery is greater than or equal to a predetermined amount, When the voltage difference between the voltage of any one of the battery modules and the voltage of the remaining at least one battery module of the plurality of battery modules is equal to or greater than a predetermined voltage, It is determined that an abnormality has occurred due to a short circuit. On the other hand, when the remaining capacity of the battery is less than the predetermined amount, even if the voltage difference at the time of discharging the battery is greater than or equal to the predetermined voltage, it is not determined as an abnormality due to a short circuit in any one battery module. Therefore, the drive device may be driven even when the remaining capacity of the battery is less than a predetermined amount, so the remaining capacity of the battery may be lower than the predetermined amount, and the dischargeable storage capacity of each cell is individual. Depending on the difference or state difference, polarity may occur in some cells due to battery discharge, but when the remaining battery capacity is less than a predetermined amount, the voltage difference during battery discharge is greater than or equal to a predetermined voltage. However, since it is not determined as an abnormality due to a short circuit in the battery module, an abnormality due to a short circuit in the battery module of the battery can be determined more appropriately.

It is a block diagram which shows the outline of a structure of the hybrid vehicle 20 carrying the drive device which is one Example of this invention. 3 is a configuration diagram showing an outline of a configuration of a battery 50. FIG. It is explanatory drawing which shows an example of the relationship between battery temperature Tb and the basic value of input / output restrictions Win and Wout. It is explanatory drawing which shows an example of the relationship between the remaining capacity SOC of the battery 50, and the correction coefficient of input / output restrictions Win and Wout. It is a flowchart which shows an example of the starting control routine performed by the hybrid electronic control unit 60 of an Example. It is a flowchart which shows an example of the abnormality determination routine performed by battery ECU52 of an Example. It is a flowchart which shows an example of the abnormality determination routine performed by battery ECU52 of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with a driving apparatus according to an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 32 configured as an internal combustion engine using gasoline, light oil, or the like as a fuel, and a crank position from a crank position sensor 34 a that detects the rotational position of the crankshaft 34. An engine electronic control unit (hereinafter referred to as engine ECU) 36 that controls the engine 32 by inputting various detection values, a carrier is connected to the crankshaft 34 of the engine 32, and differential gears are connected to the drive wheels 26a and 26b. A planetary gear mechanism 38 in which a ring gear is connected to a drive shaft 22 connected via a motor 24, a motor MG1 configured as, for example, a synchronous generator motor and having a rotor connected to a sun gear of the planetary gear mechanism 38, and a synchronous power generation, for example. It is configured as an electric motor and the rotor is connected to the drive shaft 22 The motors MG1 and MG2 are driven and controlled by switching the motors MG2 and inverters 41 and 42 that drive the motors MG1 and MG2 and switching elements (not shown) of the inverters 41 and 42 that receive various detection values. A motor electronic control unit (hereinafter referred to as a motor ECU) 44, a battery 50 that exchanges power with the motors MG 1 and MG 2 via a power line 47 shared by the inverters 41 and 42, and an inverter connected to the power line 47 A compressor 46 of an air conditioner (not shown) that is driven by using electric power from the battery 50 supplied via 45, a battery electronic control unit (hereinafter referred to as a battery ECU) 52 that manages the battery 50, and the entire vehicle are controlled. The hybrid electronic control unit 60 Obtain. The engine ECU 36 also calculates the rotational speed of the crankshaft 34a, that is, the rotational speed Ne of the engine 22 based on the crank position from the crank position sensor 34a. Note that the drive device of the embodiment mainly corresponds to the motor MG1, the battery 50, the hybrid electronic control unit 60, the motor ECU 44, and the battery ECU 52.

  FIG. 2 is a configuration diagram showing an outline of the configuration of the battery 50. In the battery 50 of the embodiment, as shown in the figure, four battery modules M1 to M4 formed by connecting a plurality of cells configured as a secondary battery such as a nickel metal hydride battery or a lithium ion battery are connected in series. The voltage sensors S1 to S4 are respectively attached between the terminals of the battery modules M1 to M4. The battery ECU 52 that manages the battery 50 is configured as a microprocessor centered on the CPU 52a. In addition to the CPU 52a, a ROM 52b that stores a processing program, a RAM 52c that temporarily stores data, an input / output port and a communication port (not shown). With. The battery ECU 52 detects the battery voltage Vb from the voltage sensor 51a attached between the terminals of the battery 50 as shown in FIG. 1 and the current that is attached in the vicinity of the positive terminal of the battery 50 to charge and discharge the battery 50. In addition to the charge / discharge current Ib from the current sensor 51b and the battery temperature Tb from the temperature sensor 51c attached to a part of the battery 50, the battery modules M1 to M1 detected by the voltage sensors S1 to S4 as shown in FIG. Voltages V1 to V4 between the terminals of M4 are input via the input port, and data regarding the state of the battery 50 is output to the hybrid electronic control unit 60 by communication as necessary. Further, the battery ECU 52 calculates the remaining capacity SOC, which is the ratio of the stored capacity to the total capacity of the battery 50, based on the integrated value of the charge / discharge current Ib, or calculates the calculated remaining capacity SOC and the battery temperature Tb. Based on this, the input / output limits Win and Wout, which are the maximum allowable power that may charge / discharge the battery 50, are calculated. The input / output limits Win and Wout of the battery 50 are set to the basic values of the input / output limits Win and Wout based on the battery temperature Tb, and the input limit correction coefficient and the output limit are set based on the remaining capacity SOC of the battery 50. It can be set by setting a correction coefficient and multiplying the basic value of the set input / output limits Win and Wout by the correction coefficient. FIG. 3 shows an example of the relationship between the battery temperature Tb and the basic values of the input / output limits Win and Wout, and FIG. 4 shows an example of the relationship between the remaining capacity SOC of the battery 50 and the correction coefficients of the input / output limits Win and Wout. . In FIG. 4, the predetermined amount Sref indicates the remaining capacity SOC that should be prohibited from discharging the battery 50, and experiments are performed in advance so that the deterioration of the battery 50 is suppressed based on the characteristics of the secondary battery constituting the cell of the battery 52. Or those determined by analysis (for example, 10%, 20%, 30%, etc.) can be used. In the battery 50, each cell is configured to be the same, and each battery module having the same number of cells is also configured to be the same. Usually, each cell and each battery module are manufactured. There are individual differences due to errors and aging, and state differences due to temperature.

  The hybrid electronic control unit 60 is configured as a microprocessor centered on a CPU (not shown), and includes a ROM, a RAM, an input / output port, and a communication port in addition to the CPU. The hybrid electronic control unit 60 includes a shift position SP (for example, a drive (D) position for forward travel, a reverse (R) position for reverse travel, a parking position) from a shift position sensor 62 that detects the position of the shift lever. (P) position, neutral (N) position, etc.) and accelerator position Acc from the accelerator pedal position sensor 64 that detects the amount of depression of the accelerator pedal, brake position from the brake pedal position sensor 66 that detects the amount of depression of the brake pedal The engine ECU 36 and the motor ECU 44 are connected via a communication port by inputting the BP, the vehicle speed V from the vehicle speed sensor 68 and the like, and outputting a switching control signal to the inverter 45 that drives the compressor 46 of the air conditioner. And the battery ECU52 and exchanges various control signals and data.

  The hybrid vehicle 20 of the embodiment configured in this manner calculates a required torque to be output to the drive shaft 22 based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. The operation of the engine 32, the motor MG1, and the motor MG2 is controlled so that the traveling power corresponding to the torque is output to the drive shaft 22. As the operation control of the engine 32, the motor MG1, and the motor MG2, the engine 32 is operated so that the power corresponding to the sum of the traveling power and the charging / discharging power required for charging / discharging the battery 50 is output from the engine 32. All or a part of the power output from the engine 32 with control and charge / discharge of the battery 50 is torque-converted by the planetary gear mechanism 38, the motor MG1, and the motor MG2, and the traveling power is output to the drive shaft 22. The charge / discharge operation mode for driving and controlling the motor MG1 and the motor MG2 and the motor operation mode for controlling the operation so that the operation of the engine 32 is stopped and the power corresponding to the traveling power from the motor MG2 is output to the drive shaft 22. and so on. Switching from the motor operation mode to the charge / discharge operation mode is a lower limit at which the engine 32 can be operated relatively efficiently when the start condition of the engine 32 is satisfied, that is, the sum of the travel power and the charge / discharge power. This is done by starting the engine 32 when the starting threshold value, which is the power near the value, is exceeded.

  Next, an operation of the drive device mounted on the hybrid vehicle 20 of the embodiment thus configured, particularly an operation when determining an abnormality due to a short circuit of the battery 50 will be described. FIG. 5 is a flowchart showing an example of a start control routine executed by the hybrid electronic control unit 60, and FIG. 6 is a flowchart showing an example of an abnormality determination routine executed by the battery ECU 52. The routine of FIG. 5 is executed when the start condition of the engine 32 that is stopped regardless of the remaining capacity SOC of the battery 50 is satisfied, and the routine of FIG. 6 is performed every predetermined time (for example, every several tens of milliseconds or several hundreds of milliseconds). Etc.) repeatedly. In order to describe the determination of an abnormality due to the short circuit of the battery 50, the start control of the engine 32 will be described first.

  When the start control routine of FIG. 5 is executed, a torque map at the time of start set in advance so that the engine 32 can be started by motoring of the motor MG1 and an elapsed time t from the start of start of the engine 32 are obtained. Based on this, the torque command Tm1 * of the motor MG1 is set (step S100), the set torque command Tm1 * is transmitted to the motor ECU 44 (step S110), and the engine 32 is calculated based on the signal from the crank position sensor 34a. Is input from the engine ECU 36 by communication (step S120), and the input rotation speed Ne is compared with a predetermined rotation speed Nref for starting fuel injection and ignition (step S130). Here, the motor ECU 44 that has received the torque command Tm1 * performs switching control of the inverter 41 so that the motor MG1 is driven by the torque command Tm1 *. Then, when the rotational speed Ne of the engine 32 reaches the predetermined rotational speed Nref or higher, the engine ECU 36 is caused to start the fuel injection control and the ignition control of the engine 32 when the rotational speed Ne first becomes the predetermined rotational speed Nref or higher. An instruction signal is transmitted (step S140), and after the process of step S100 is repeatedly executed until the engine 32 reaches a complete explosion (step S150), the start control routine is terminated. At this time, in a drive control routine (not shown) executed by the hybrid electronic control unit 60, the torque that acts on the drive shaft 22 via the planetary gear mechanism 38 when the motor MG1 is driven with the torque command Tm1 * is determined from the required torque. A torque command Tm2 * of the motor MG2 as a torque obtained by subtraction is set and transmitted to the motor ECU 44. The motor ECU 44 also performs switching control of the inverter 42 so that the motor MG2 is driven by the received torque command Tm2 *. . In the hybrid vehicle 20 of the embodiment, the engine 32 can be started by driving the motor MG1 using the electric power from the battery 50 while traveling with the required torque in this way. In the embodiment, as described above, when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref, the output limit Wout of the battery 50 is set to 0 and the discharge of the battery 50 is prohibited. When driving the motor MG1 to start the engine 32, or when driving the compressor 46 of the air conditioner or an auxiliary machine (not shown) when the shift position SP is in the neutral position and the inverters 41 and 42 are gate-cut off. The battery 50 is discharged regardless of the output limit Wout, that is, regardless of the remaining capacity SOC.

  Next, determination of abnormality due to short circuit of the battery 50 will be described. When the abnormality determination routine of FIG. 6 is executed, the CPU 52a of the battery ECU 52 first inputs data necessary for determination such as the charge / discharge current Ib and the remaining capacity SOC of the battery 50, and the voltages V1 to V4 of the battery modules M1 to M4. Then, a process of resetting the variable x used in this routine to the value 0 is executed (step S210). Subsequently, it is determined whether or not the input remaining capacity SOC is equal to or greater than the predetermined amount Sref (step S220). When the remaining capacity SOC is equal to or greater than the predetermined amount Sref, it is determined that discharging of the battery 50 is not prohibited. Then, it is determined whether or not the battery 50 is being discharged (step S230). The discharge of the battery 50 can be determined based on the charge / discharge current Ib. The reason for determining the remaining capacity SOC of the battery 50 and the discharging state will be described later for convenience of explanation.

  When the battery 50 is being discharged, it is determined that an abnormality due to a short circuit in the battery modules M1 to M4 of the battery 50 can be detected, and the variable x is incremented (step S240). At present, since the immediately after the execution of this routine is considered, a value 1 is set to the variable x. Subsequently, the voltage difference ΔVxi of the voltage Vi of all the other battery modules Mi (where the variable i = 1 to 4, except i = x) with respect to the voltage Vx of the battery module Mx corresponding to the variable x is set to the voltage Vi. Is calculated by subtracting the voltage Vx from (step S250). Here, the variable x and the variable i are used as subscripts for specifying the corresponding battery module and its voltage and voltage difference. Now, since the value x is set to the variable x, the voltage differences ΔV12, ΔV13, ΔV14 of the voltages V2, V3, V4 of all the other battery modules M2, M3, M4 with respect to the voltage V1 of the battery module M1 are set. Will be calculated.

  When the voltage difference ΔVxi is thus calculated, it is determined whether or not all the calculated voltage differences ΔVxi (now ΔV12, ΔV13, ΔV14) are equal to or higher than the predetermined voltage Vref (step S260). The predetermined voltage Vref is for determining whether or not a slight short circuit has occurred between the positive and negative electrodes due to metal deposition or the like inside the cell of the battery 50. In the embodiment, the remaining capacity SOC of the battery 50 is prohibited from discharging. A voltage (for example, 1.3 V, 1.5 V, etc.) slightly larger than the voltage of a single cell (for example, 1.0 V, 1.2 V, etc.) at the predetermined amount Sref is used.

  When all the voltage differences ΔVxi are equal to or higher than the predetermined voltage Vref, it is determined that an abnormality due to a short circuit has occurred in the battery module Mx (now M1), and the value 0 is set as an initial value that is a flag indicating the determination result of the abnormality due to the short circuit. Is set to a value 1 for the abnormality determination flag Fx (now F1) for which is set (step S270), and if any one of all the calculated voltage differences ΔVxi is less than the predetermined voltage Vref, the abnormality determination flag Fx is set. Without determining whether or not the variable x is a value 4 representing the number of battery modules (step S280). Now, since the value x is set to the variable x, it is determined whether or not an abnormality due to a short circuit has occurred in the battery module M2 by executing the processing of steps S240 to S280 again. The same determination is performed for the battery modules M3 and M4, and when it is determined that the variable x has a value of 4, the abnormality determination routine ends. By such processing, it is possible to determine whether or not an abnormality due to a short circuit has occurred in the battery modules M1 to M4 of the battery 50. When the value 1 is set in any of the abnormality determination flags F1 to F4, a signal indicating abnormality of the battery 50 is transmitted from the battery ECU 52 to the hybrid electronic control unit 60, and a warning light in a passenger compartment (not shown) is turned on. Processing is performed.

  When the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref in step S220, or when the battery 50 is not being discharged in step S230, the abnormality determination routine is terminated without performing the abnormality determination processing in step S240 and subsequent steps. The reason why the abnormality determination process after step S240 is performed only when the battery 50 is being discharged is that the voltage drop of the battery module due to the micro short circuit of the cell occurs during the discharge. Further, when the remaining capacity SOC is less than the predetermined amount Sref, the abnormality determination process after step S240 is not performed because the voltage drop of the battery module during discharge due to a cause different from the micro short circuit of the cell is caused by the micro short circuit of the cell. This is to avoid erroneously determining that the voltage is low. In the embodiment, as described above, when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref, a value 0 is basically set to the output limit Wout of the battery 50 and discharging of the battery 50 is prohibited. The battery 50 is discharged regardless of the output limit Wout, that is, regardless of the remaining capacity SOC. When such a discharge is continuously performed when the remaining capacity SOC is less than the predetermined amount Sref, or when the discharge is performed with the battery temperature Tb being low and the internal resistance of the battery 50 being large, the remaining capacity SOC is reduced to a value close to zero. May decrease. In this case, each cell and each battery module of the battery 50 has a manufacturing error, an individual difference due to aging, a state difference due to temperature, etc. (for example, a mounting position of a cooling fan (not shown) that cools each battery module with cooling air or cooling air Therefore, if the battery 50 is further discharged when the remaining capacity SOC of the battery 50 as a whole decreases to a value close to 0, among the plurality of cells, When one cell is further discharged from a state in which the amount of stored electricity reaches 0, a reversal in which the polarity is reversed occurs, and the voltage of the battery module including the cell where the reversal has occurred is greatly reduced from the other battery modules. Occurs. As described above, the voltage drop of the battery module during discharge may be caused by a cause different from the micro short circuit of the cell. Therefore, when the remaining capacity SOC is less than the predetermined amount Sref, the abnormality determination process after step S240 is not performed. To do. By such a process, it is possible to suppress erroneous determination that the voltage drop of the temporary battery module during discharge due to cell reversal is a voltage drop due to a fine short circuit of the cell as a hardware failure, An abnormality due to a short circuit in the battery module of the battery 50 can be determined more appropriately. As a result, it is possible to suppress wasteful inspection and replacement of the battery 50 by a warning to the driver or the like.

  According to the hybrid vehicle 20 equipped with the driving device of the embodiment described above, when the remaining capacity SOC of the battery 50 is greater than or equal to a predetermined amount Sref that should prohibit the discharge of the battery 50, a plurality of battery modules are being discharged during the discharge of the battery 50. When the voltage difference ΔVxi between the voltage Vx of any one of the battery modules Mx out of M1 to M4 and the voltages Vi of all the remaining battery modules Mi is equal to or higher than the predetermined voltage Vref, an abnormality due to a short circuit occurs in the battery module Mx. If the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref, it is not determined that there is an abnormality due to a short circuit in the battery module Mx even when the voltage difference ΔVxi is greater than or equal to the predetermined voltage Vref during discharge of the battery 50. The erroneous determination can be suppressed, and the battery 50 is short-circuited in the battery module. Abnormality can be determined more appropriately.

  In the hybrid vehicle 20 equipped with the driving device of the embodiment, an abnormality due to a short circuit in the battery module Mx when the voltage difference ΔVxi of the voltages Vi of all the other battery modules Mi with respect to the voltage Vx of the battery module Mx is equal to or higher than a predetermined voltage Vref. However, when the voltage difference of the voltage of the other battery module with respect to the voltage Vx of the battery module Mx is equal to or higher than the predetermined voltage Vref, it is determined that there is an abnormality, or the voltage Vx of the battery module Mx When the voltage difference of the voltage of the other two or three battery modules with respect to is equal to or higher than the predetermined voltage Vref, it is determined that there is an abnormality, or the average value or median value of the voltages of all other battery modules with respect to the voltage Vx of the battery module Mx It is good also as what determines with abnormality when the voltage difference of these is more than the predetermined voltage Vref.

  In the hybrid vehicle 20 equipped with the driving device of the embodiment, it is determined whether or not the remaining capacity SOC of the battery 50 is equal to or greater than a predetermined amount Sref and an abnormality due to a short circuit in the battery module occurs during the discharge of the battery 50. However, the remaining capacity SOC of the battery 50 may be a predetermined amount or more, the output limit Wout may be a value of 0, and it may be determined whether or not an abnormality due to a short circuit in the battery module occurs during the discharge of the battery 50.

  In the hybrid vehicle 20 equipped with the driving device of the embodiment, when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref, it is determined whether or not an abnormality due to a short circuit in the battery module has occurred. However, when the remaining capacity SOC is less than the predetermined amount Sref, it is determined whether or not an abnormality due to a short circuit in the battery module has occurred regardless of the remaining capacity SOC of the battery 50. The determination result may be masked when it is determined that the occurrence has occurred. In this case, the abnormality determination routine of FIG. 7 may be executed instead of the routine of FIG. The routine of FIG. 7 performs the same processing as the routine of FIG. 6 except that the processing of steps S300 to S330 is performed without performing the processing of steps S200 and S220 of the routine of FIG. The same steps are denoted by the same step numbers, and detailed description thereof is omitted. In the routine of FIG. 7, first, the charging / discharging current Ib of the battery 50, the voltages V1 to V4 of the battery modules M1 to M4, etc. are input (step S300), the variable x is reset to the value 0 (step S210), A value 1 is set to the abnormality determination flag Fx according to the determination result of whether or not an abnormality due to a short circuit in the battery modules M1 to M4 occurs during the discharging of the battery (steps S230 to S280), and then the remaining capacity of the battery 50 In addition to inputting the SOC (step S310), it is determined whether or not the input remaining capacity SOC is less than the predetermined amount Sref (step S320). When the remaining capacity SOC is greater than or equal to the predetermined amount Sref, the abnormality determination routine is terminated as it is. However, when the remaining capacity SOC is less than the predetermined amount Sref, the short-circuit abnormality determination flags F1 to F4 are reset to the value 0. Te (step S320), and ends the abnormality determination routine. Such processing can also suppress erroneous determination, and can more appropriately determine an abnormality caused by a short circuit in the battery module of the battery 50.

  In the hybrid vehicle 20 equipped with the drive device of the embodiment, the battery 50 is configured as four battery modules M1 to M4 formed by connecting a plurality of cells in series. 50 may be any number of battery modules as long as two or more battery modules formed by connecting a plurality of cells in series are connected in series.

  Further, the present invention is not limited to those applied to such hybrid vehicles, but is a normal vehicle that travels by power from an engine that is started by a starter motor, a vehicle such as a train other than these vehicles, or a moving body such as a ship or an aircraft. It is also possible to adopt a form of a drive unit mounted on the vehicle or a form of drive unit incorporated in a non-moving facility such as a construction facility. Furthermore, it is good also as a form of the abnormality determination method of such a drive device.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the battery modules M1 to M4 correspond to the “battery module”, the battery 50 corresponds to the “battery”, the motor MG1 corresponds to the “driving device”, and the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref. Even in the case of FIG. 5, the start control routine of FIG. 5 is executed to drive the motor MG1 so that the engine 32 is started when the start condition of the engine 32 in which the sum of the driving power and the charging / discharging power exceeds the start threshold is satisfied. The hybrid electronic control unit 60 and the motor ECU 44 that performs switching control of the inverter 41 so that the motor MG1 is driven by the torque command Tm1 * correspond to “driving device control means” and detect the voltages of the battery modules M1 to M4. The voltage sensors S1 to S4 correspond to “voltage detection means”, and the remaining capacity SOC of the battery 50 is a predetermined amount Sre. In the above case, an abnormality due to a short circuit in the battery module Mx occurs when the voltage difference ΔVxi between the voltage Vx of the battery module Mx and the voltages Vi of all other battery modules Mi is equal to or higher than the predetermined voltage Vref during the discharge of the battery 50. 6 is set so that when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref, the abnormality due to the short circuit in the battery module is not determined. The battery ECU 52 that executes the routine corresponds to “abnormality determination means”. Further, the compressor 46 of the air conditioner and an auxiliary machine (not shown) also correspond to “drive device”, and the engine 32 corresponds to “internal combustion engine”.

  Here, the “battery module” is not limited to the battery modules M1 to M4, and any battery module may be used as long as a plurality of cells are connected in series. . The “battery” is not limited to the battery 50, and any battery may be used as long as it is formed by connecting a plurality of battery modules in which a plurality of cells as secondary batteries are connected in series. I do not care. The “drive device” is not limited to the motor MG1, the compressor 46 of the air conditioner, and an auxiliary machine (not shown), and may be any device as long as it is driven using power from the battery. The “drive device control means” is not limited to the combination of the hybrid electronic control unit 60 and the motor ECU 44, and may be configured by a single electronic control unit. Further, as the “driving device control means”, the start condition of the engine 32 in which the sum of the travel power and the charge / discharge power exceeds the start threshold even when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref is satisfied. It is not limited to the switching control of the inverter 41 to drive the motor MG1 so that the engine 32 is sometimes started, and the remaining capacity, which is the dischargeable storage capacity of the battery, should be prohibited from discharging the battery. Even when the amount is less than a predetermined amount, the drive device is controlled so that the drive device is driven using the electric power from the battery when a predetermined drive condition that prioritizes the drive of the drive device over the prohibition of battery discharge is satisfied. It does not matter as long as it is anything. The “voltage detection means” is not limited to the voltage sensors S1 to S4 that detect the voltages of the battery modules M1 to M4, but those that detect the voltage of two, three, five or more battery modules, Any device that detects the voltage of each of the plurality of battery modules may be used. The “abnormality determination unit” is not limited to one configured by a single electronic control unit such as the battery ECU 52, and may be configured by a combination of a plurality of electronic control units. Further, as the “abnormality determination means”, the voltage difference between the voltage Vx of the battery module Mx and the voltages Vi of all other battery modules Mi during the discharge of the battery 50 when the remaining capacity SOC of the battery 50 is equal to or greater than the predetermined amount Sref. When ΔVxi is equal to or higher than the predetermined voltage Vref, it is determined that an abnormality has occurred due to a short circuit in the battery module Mx, the value 1 is set in the abnormality determination flag Fx, and when the remaining capacity SOC of the battery 50 is less than the predetermined amount Sref The present invention is not limited to the determination that the abnormality due to the short circuit in the battery module is not performed, and the determination of the abnormality due to the short circuit in the battery module is performed even when the remaining capacity SOC is less than the predetermined amount Sref. When the remaining capacity of the battery exceeds a specified level Arbitrary when the voltage difference between the voltage of any one of the detected plurality of battery modules and the voltage of the remaining at least one of the plurality of battery modules is equal to or greater than a predetermined voltage It is determined that an abnormality has occurred due to a short circuit in one of the battery modules, and when the remaining capacity of the battery is less than a predetermined amount, even if the voltage difference at the time of discharging the battery is greater than or equal to the predetermined voltage, Anything may be used as long as it is not determined that the abnormality is caused by a short circuit. Further, the “internal combustion engine” is not limited to the engine 32, and may be another type of internal combustion engine such as a hydrogen engine.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the drive device and vehicle manufacturing industries.

  20 Hybrid Vehicle, 22 Drive Shaft, 24 Differential Gear, 26a, 26b Drive Wheel, 32 Engine, 34 Crankshaft, 34a Crank Position Sensor, 36 Engine Electronic Control Unit, 38 Planetary Gear Mechanism, 41, 42, 45 Inverter, 44 Electronic control unit for motor, 46 compressor, 47 power line, 50 battery, 51a voltage sensor, 51b current sensor, 51c temperature sensor, 52 electronic control unit for battery, 60 electronic control unit for hybrid, 62 shift position sensor, 64 accelerator pedal Position sensor, 66 Brake pedal position sensor, 68 Vehicle speed sensor, M1-M4 battery module, MG1, MG2 motor, S1-S4 voltage sensor.

Claims (4)

A battery formed by connecting a plurality of battery modules in which a plurality of cells as secondary batteries are connected in series, a driving device driven using power from the battery, and a dischargeable power storage of the battery Even when the remaining capacity, which is the capacity, is less than a predetermined amount that should prohibit the discharge of the battery, the power from the battery is used when a predetermined drive condition that prioritizes the drive of the drive device over the prohibition of the discharge of the battery is satisfied. A driving device control means for controlling the driving device so that the driving device is driven,
Voltage detection means for detecting the voltage of each of the plurality of battery modules;
When the remaining capacity of the battery is equal to or greater than the predetermined amount, the voltage of any one of the detected battery modules and the remaining of the detected battery modules when the battery is discharged When the voltage difference from the voltage of at least one battery module is greater than or equal to a predetermined voltage, it is determined that an abnormality has occurred due to a short circuit in the arbitrary one battery module, and the remaining capacity of the battery is less than the predetermined amount An abnormality determination means that sometimes does not determine an abnormality due to a short circuit in any one of the battery modules even when the voltage difference during discharging of the battery is equal to or greater than the predetermined voltage;
A drive device comprising: The drive device according to claim 1,
The abnormality determination unit is a unit that does not determine abnormality due to the short circuit when a remaining capacity of the battery is less than the predetermined amount.
Drive device. The driving device according to claim 1 or 2,
An internal combustion engine capable of outputting driving power;
A vehicle comprising:
The drive device is an electric motor capable of motoring the internal combustion engine,
The predetermined driving condition is a condition for starting the internal combustion engine with motoring of the internal combustion engine by the electric motor.
vehicle. A battery formed by connecting a plurality of battery modules in which a plurality of cells as secondary batteries are connected in series, a driving device driven using power from the battery, and a dischargeable power storage of the battery Even when the remaining capacity, which is the capacity, is less than a predetermined amount that should prohibit the discharge of the battery, the power from the battery is used when a predetermined drive condition that prioritizes the drive of the drive device over the prohibition of the discharge of the battery is satisfied. A drive device control means for controlling the drive device so that the drive device is driven.
When the remaining capacity of the battery is greater than or equal to the predetermined amount, the voltage of any one of the plurality of battery modules and the remaining at least one battery module of the plurality of battery modules when the battery is discharged It is determined that an abnormality has occurred due to a short circuit in any one of the battery modules when the voltage difference from the voltage of the battery is greater than or equal to a predetermined voltage. When the remaining capacity of the battery is less than the predetermined amount, the battery is discharged Even when the voltage difference in is not less than the predetermined voltage, it is not determined as an abnormality due to a short circuit in the arbitrary one battery module,
An abnormality determination method characterized by the above.

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