JP2012170282A - Vehicle drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device that makes a driver bodily sense a charge state of a battery, and does not cause change of the charge state of the battery to cahnge a distance adjustment feeling of the driver and the acceleration performance of the vehicle, by an accelerator operation, in a case of a region of a low or high accelerator opening.SOLUTION: A vehicle drive control device has a torque command decision part which decides, when the accelerator opening is in a first region of zero or more and less than a predetermined first upper limit value, a command value of an output torque so that a ratio of the output torque to the maximum torque increases in proportion to the accelerator opening irrespective of the charge state, and if the accelerator opening is within a second region of the first upper limit value or more and less than a second upper limit value, decides a command value of the output torque so that the ratio of the output torque is increased in proportion to the acceleration opening, and the ratio of the output torque is decreased as the charge state is lowered.

Description

  The present invention relates to a vehicle drive control device that controls a vehicle drive device that includes a rotating electrical machine that is drivingly connected to a wheel and a power storage device that stores electric power supplied to the rotating electrical machine.

  Regarding the vehicle drive control apparatus as described above, for example, the following technologies are disclosed in Patent Documents 1 and 2 below. In the technique of Patent Document 1, when the charge state of a power storage device such as a battery is lowered, if the same torque as the maximum torque in the high charge state is output, the power storage device is overdischarged, and the power storage device is further deteriorated. Since there is a fear, the maximum torque output to the rotating electrical machine is reduced as the state of charge of the power storage device decreases. Further, in the technique of Patent Document 1, since only the maximum torque is changed according to the state of charge of the power storage device, the output torque of the rotating electrical machine does not change according to the accelerator opening near the maximum value of the accelerator opening. In order to make the driver feel uncomfortable, the entire setting characteristic for setting the output torque of the rotating electrical machine according to the accelerator opening is changed according to the state of charge of the power storage device. That is, the magnitude of the maximum torque is reduced according to the decrease in the state of charge of the power storage device, and the output torque of the rotating electrical machine set according to each accelerator opening from 0% to 100% is also reduced. Yes.

  However, in the technique of Patent Document 1, even in a region where the accelerator opening is low, the relationship between the accelerator opening and the output torque of the rotating electrical machine changes according to the state of charge of the power storage device. This region where the accelerator opening is low is often used when the driver finely adjusts the distance between the front and rear obstacles, such as during parking and traffic jams. Therefore, in a region where the accelerator opening is low, if the relationship between the output torque of the rotating electrical machine and the accelerator opening changes due to a change in the state of charge, the driver feels uncomfortable with the distance adjustment and the driver feels uncomfortable. There is a risk of giving.

  In the technique of Patent Document 1, the maximum torque that is output to the rotating electrical machine is reduced in accordance with a decrease in the state of charge of the power storage device in order to prevent deterioration of the power storage device due to overdischarge. For this reason, as the state of charge of the power storage device decreases, the output torque of the rotating electrical machine when the accelerator opening is the maximum value (100%) is also decreased. The maximum value of the accelerator opening is often used when sudden acceleration is required during overtaking operation. Therefore, if the output torque of the rotating electrical machine is reduced due to a decrease in the state of charge at the maximum value of the accelerator opening, sufficient acceleration intended by the driver may not be obtained.

In the technique of Patent Document 2, conversion is performed by switching the conversion characteristic from the detected accelerator opening to the accelerator opening used for control (control accelerator opening) according to the operation mode selected by the driver's switch operation. The output torque of the rotating electrical machine is set according to the control accelerator opening.
However, in the technique of Patent Document 2, in order to change the relational characteristic of the output torque of the rotating electrical machine with respect to the accelerator opening, a driver's switch operation is necessary, and automatically according to the state of charge of the power storage device. It cannot cope with changing the relational characteristics.

JP 2005-348482 A JP 2010-042700 A

  By the way, in a vehicle using a rotating electrical machine as a driving force source, it takes a relatively long time to charge the power storage device, and places where charging is possible are limited. Therefore, it is desirable that the driver can easily grasp the remaining charge. The driver can also check the state of charge of the power storage device by visually checking the fuel gauge of the power storage device power, but if the driver can experience the state of charge of the power storage device during driving, the driver can see the state of charge of the power storage device. It can be easily recognized and can be prepared in advance for a lack of charge.

  Therefore, a vehicle drive control device that allows the driver to experience the state of charge of the power storage device while suppressing the driver from causing the rotating electric machine to appropriately output torque according to the driving state of the vehicle. Is required.

  According to the present invention, a characteristic configuration of a vehicle drive control device that is controlled by a vehicle drive device including a rotating electrical machine that is drivingly connected to a wheel and a power storage device that stores electric power supplied to the rotating electrical machine is Based on an accelerator opening detector that detects an accelerator opening that represents an operation amount of an accelerator pedal that is provided, a charging state detector that detects a charging state of the power storage device, the accelerator opening and the charging state, A torque command determining unit that determines a command value of output torque to be output to the rotating electrical machine within a range equal to or less than a maximum torque set for the rotating electrical machine, wherein the torque command determining unit has a zero accelerator opening. When the acceleration is within the first region less than the predetermined first upper limit value, the ratio of the output torque to the maximum torque as the accelerator opening increases regardless of the state of charge. The command value of the output torque is determined so as to increase, and the accelerator opening is increased when the accelerator opening is in a second region that is greater than or equal to the first upper limit and less than a predetermined second upper limit. Accordingly, the output torque command value is determined such that the ratio of the output torque to the maximum torque increases and the ratio of the output torque to the maximum torque decreases as the state of charge decreases.

In the present application, the “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as necessary.
Further, in the present application, “driving connection” refers to a state where two rotating elements are connected so as to be able to transmit a driving force, and the two rotating elements are connected so as to rotate integrally, or It is used as a concept including a state in which two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Examples of such a transmission member include various members that transmit rotation at the same speed or a variable speed, and include, for example, a shaft, a gear mechanism, a belt, a chain, and the like. In addition, as such a transmission member, an engagement element that selectively transmits rotation and driving force, such as a friction clutch or a meshing clutch, may be included.

  According to the above characteristic configuration, when the accelerator opening is within a first region that is greater than or equal to zero and less than the predetermined first upper limit value, the output torque with respect to the maximum torque as the accelerator opening increases regardless of the state of charge. Since the output torque command value is determined so that the ratio of the vehicle is large, the area where the accelerator opening is low is used when the driver finely adjusts the distance between obstacles in front of and behind the vehicle, such as when parking or in traffic jams. In FIG. 5, the relationship between the accelerator opening and the output torque of the rotating electrical machine is maintained constant regardless of the change in the state of charge. Therefore, it is possible to suppress the occurrence of a nuisance in the driver's sense of distance adjustment and the discomfort of the driver.

  Further, according to the above characteristic configuration, when the accelerator opening is in the second region not less than the first upper limit value and less than the predetermined second upper limit value, the output torque relative to the maximum torque increases as the accelerator opening increases. The output torque command value is determined so that the ratio of the output torque to the maximum torque decreases as the ratio increases and the state of charge decreases. Accordingly, as the state of charge becomes lower, the driver needs to increase the accelerator opening in order to obtain the driving force (acceleration) of the same vehicle, so that the driver can experience a decrease in the state of charge. it can. In addition, the second region where the accelerator opening is higher than the first region is a region where the output torque of the rotating electrical machine is larger than that of the first region and is frequently used in continuous running. By keeping the output torque low, it is possible to effectively reduce power consumption and extend the travelable distance until the next charging.

  Therefore, according to the above-described characteristic configuration, the driver can experience the state of charge of the power storage device while suppressing the driver from causing the rotating electric machine to appropriately output torque according to the driving state of the vehicle. In addition, power consumption by the rotating electrical machine can be effectively suppressed.

  Here, when the accelerator opening is the maximum value, the torque command determination unit preferably determines the command value of the output torque as the maximum torque regardless of the state of charge.

  According to this configuration, when the accelerator opening is set to the maximum value by the driver, the rotating electrical machine can output the maximum torque regardless of the state of charge. Therefore, sufficient acceleration intended by the driver can be obtained when sudden acceleration is required during overtaking driving or danger avoidance driving.

  Here, the torque command determination unit, when the second upper limit value is less than the maximum value of the accelerator opening, and the accelerator opening is in a third region not less than the second upper limit value and not more than the maximum value. Preferably, the output torque command value is determined so that the ratio of the output torque to the maximum torque increases as the accelerator opening increases regardless of the state of charge.

  When the accelerator opening is in the third region close to the maximum value, the accelerator opening is likely to be used when sudden acceleration is required during overtaking operation or danger avoidance operation. According to said structure, when the accelerator opening degree exists in a 3rd area | region, the relationship of the output torque of a rotary electric machine with respect to an accelerator opening degree can be prevented from changing by the change of a charge condition. Therefore, when sudden acceleration is required during overtaking operation, danger avoidance operation, etc., sufficient acceleration intended by the driver according to the accelerator opening can be obtained.

  Here, the torque command determination unit includes a maximum torque setting unit that sets a maximum torque according to a rotation speed of the rotating electrical machine, and the output torque with respect to the maximum torque based on the accelerator opening and the state of charge. An output ratio determining unit that determines a torque output ratio, and an output command value determining unit that determines a command value of the output torque based on the maximum torque and the torque output ratio. When the accelerator opening is within the first region, the torque output ratio is determined to be a larger value as the accelerator opening increases, regardless of the state of charge. When the torque output ratio is within the second region, the torque output ratio is determined to be a value that increases as the accelerator opening increases and decreases as the state of charge decreases. It is suitable.

  According to this configuration, the output torque command value to be changed according to the rotational speed of the rotating electrical machine, the accelerator opening degree, and the charging state, the maximum torque to be changed according to the rotational speed of the rotating electrical machine, the accelerator opening degree, and the charging It can be determined based on the torque output ratio to be changed according to the state. That is, a four-dimensional relational characteristic consisting of three inputs and one output can be set by a two-dimensional relational characteristic consisting of one input and one output and a three-dimensional relational characteristic consisting of two inputs and one output. Therefore, the four-dimensional relational characteristic can be set by the lower-dimensional three-dimensional relational characteristic and the two-dimensional relational characteristic, and the setting of the relational characteristic can be facilitated.

  Further, according to the above configuration, since the maximum torque and the torque output ratio with respect to the maximum torque are determined, the maximum torque that is important in the power performance of the vehicle can be directly set, and the power performance of the vehicle is managed. It becomes easy.

1 is a schematic diagram illustrating a schematic configuration of a vehicle drive device and a vehicle drive control device according to an embodiment of the present invention. It is a block diagram which shows the structure of the vehicle drive control apparatus which concerns on embodiment of this invention. It is a figure explaining the process of the vehicle drive control apparatus which concerns on embodiment of this invention. It is a figure explaining the process of the vehicle drive control apparatus which concerns on embodiment of this invention. It is a figure explaining the process of the drive control apparatus for vehicles which concerns on other embodiment of this invention. It is a figure explaining the process of the drive control apparatus for vehicles which concerns on other embodiment of this invention.

[First embodiment]
An embodiment of a vehicle drive control device 30 according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of a vehicle drive device 1 and a vehicle drive control device 30 according to the present embodiment. As shown in this figure, the vehicle drive device 1 according to this embodiment includes a rotating electrical machine MG as a driving force source and a battery BT that stores electric power to be supplied to the rotating electrical machine MG, and drives the rotating electrical machine MG. The force is transmitted to the wheels W via a power transmission mechanism. Moreover, the vehicle drive device 1 includes an inverter IN for driving the rotating electrical machine MG. Battery BT is the “power storage device” in the present application.

  The electric vehicle using the rotating electrical machine MG as a driving force source includes a vehicle drive control device 30 that controls the vehicle drive device 1. As shown in FIGS. 1 and 2, the vehicle drive control device 30 detects the charge state detection unit 51 that detects the charge state SOC of the battery BT, and the accelerator opening degree Acc that represents the operation amount of the accelerator pedal AP. Based on the accelerator opening detector 52, the accelerator opening Acc, and the state of charge SOC, the output torque command value To output to the rotating electrical machine MG within the range of the maximum torque Tmax set for the rotating electrical machine MG is obtained. A torque command determination unit 53 for determining, and an inverter control unit 50 for driving and controlling the inverter IN in order to cause the rotating electrical machine MG to output the torque of the output torque command value To.

In such a configuration, when the accelerator opening degree Acc is in the first region Y1 that is greater than or equal to zero and less than the predetermined first upper limit value X1, the torque command determination unit 53 determines the accelerator opening degree regardless of the state of charge SOC. The output torque command value To is determined so that the ratio of the output torque to the maximum torque Tmax increases as Acc increases, and the accelerator opening Acc is greater than the first upper limit value X1 and less than the predetermined second upper limit value X2. In the region Y2, the ratio of the output torque to the maximum torque Tmax increases as the accelerator opening Acc increases, and the ratio of the output torque to the maximum torque Tmax decreases as the state of charge SOC decreases. This is characterized in that the torque command value To is determined.
Hereinafter, the vehicle drive device 1 and the vehicle drive control device 30 according to the present embodiment will be described in detail.

1. Configuration of Vehicle Drive Device 1 First, the configuration of the vehicle drive device 1 for an electric vehicle according to the present embodiment will be described.
The rotating electrical machine MG includes a stator St that is fixed to a non-rotating member, and a rotor Ro that includes a rotating shaft that is rotatably supported on the radially inner side of the stator St. The rotating shaft of the rotor Ro of the rotating electrical machine MG is drivingly connected so as to rotate integrally with the output shaft O. The rotating electrical machine MG is electrically connected to a battery BT serving as a power storage device via an inverter IN that performs DC / AC conversion. The rotating electrical machine MG can perform a function as a motor (electric motor) that generates power upon receiving power supply and a function as a generator (generator) that generates power upon receiving power supply. It is possible. That is, the rotating electrical machine MG receives power supplied from the battery BT via the inverter IN and powers or stores the electric power generated by the rotational driving force transmitted from the wheels W in the battery BT via the inverter IN ( Charge). Note that the battery BT is an example of a power storage device, and another power storage device such as a capacitor may be used, or a plurality of types of power storage devices may be used in combination.

  The inverter IN converts a DC power of the battery BT into an AC power to drive the rotating electrical machine MG, or a plurality of switching units for converting the AC power generated by the rotating electrical machine MG into a DC power and charging the battery BT. It has an element.

  Torque transmitted from the rotating electrical machine MG to the output shaft O is distributed and transmitted to the left and right axles AX via the output differential gear device DF, and is transmitted to the wheels W that are drivingly connected to the respective axles AX. . On the power transmission path from the rotating electrical machine MG to the wheels W, a drive mechanism that can change the gear ratio, a reduction gear, and a drive coupling mechanism such as a clutch may be provided.

2. Configuration of Vehicle Drive Control Device 30 Next, the configuration of the vehicle drive control device 30 that controls the rotating electrical machine MG will be described.
The vehicle drive control device 30 includes an arithmetic processing device such as a CPU as a core member, and a RAM (random access memory) configured to be able to read and write data from the arithmetic processing device, and an arithmetic processing device. And a storage device such as a ROM (Read Only Memory) configured to be able to read data from. Then, the vehicle drive control device 30 as shown in FIG. 2 is realized by software (program) stored in the ROM or the like of the vehicle drive control device 30 and / or hardware such as a separately provided arithmetic circuit. Functional units 50 to 54 and the like are configured.

  The vehicle drive device 1 includes sensors Se <b> 1 to Se <b> 5, and electric signals output from the sensors are input to the vehicle drive control device 30. The vehicle drive control device 30 calculates detection information of each sensor based on the input electric signal.

The battery charge state detection sensor Se1 is a sensor for detecting the charge state SOC of the battery BT. In the present embodiment, the battery charge state detection sensor Se1 includes a voltage sensor for detecting battery voltage, a current sensor for detecting battery input / output current, a temperature sensor for detecting battery temperature, and the like. ing.
The accelerator opening detection sensor Se2 is a sensor for detecting an accelerator opening Acc that represents the amount of operation of the accelerator pedal AP operated by the driver.

The rotation speed sensor Se3 is a sensor for detecting the rotation speed ωe and the rotation angle of the rotation shaft of the rotating electrical machine MG. A resolver, a rotary encoder, or the like is used for the rotation speed sensor Se3.
The shift position sensor Se4 is a sensor for detecting a selection position (shift position) of the shift lever. The vehicle drive control device 30 designates any range such as “drive range”, “neutral range”, “reverse drive range”, and “parking range” based on the input information from the shift position sensor Se4. Detect whether it was done.
The current sensor Se5 is a sensor for detecting a current flowing through the coil of the rotating electrical machine MG.

  The vehicle drive control device 30 includes a functional unit that controls the operation of the rotating electrical machine MG. In the present embodiment, as shown in FIGS. 1 and 2, the vehicle drive control device 30 includes an inverter control unit 50, a charging state detection unit 51, an accelerator opening detection unit 52, a torque command determination unit 53, and a rotation speed. Functional units such as the detection unit 54 are provided. Hereinafter, each functional unit will be described in detail.

2-1. Charge state detector 51
The charge state detection unit 51 estimates the charge state SOC, the deterioration state SOH, and the like of the battery BT based on the input signal of the battery charge state detection sensor Se1. That is, the charging state detection unit 51 detects the battery voltage, the battery current, and the battery temperature based on the input signals of the voltage sensor, the current sensor, and the temperature sensor that constitute the battery charging state detection sensor Se1, and the battery voltage, Based on the battery current and the battery temperature, the charge state SOC, the deterioration state SOH, and the like are estimated.

  In addition, a battery monitoring device is provided separately from the vehicle drive control device 30, and the battery monitoring device determines the charge state SOC, the deterioration state SOH, and the like of the battery BT based on the input signal of the battery charge state detection sensor Se1. It may be configured to estimate and transmit information such as the state of charge SOC and the deterioration state SOH to the vehicle drive control device 30. In this case, the charging state detection unit 51 is configured to determine the charging state SOC used in the vehicle drive control device 30 based on information such as the charging state SOC and the deterioration state SOH transmitted from the battery monitoring device. .

2-2. Accelerator position detector 52
The accelerator opening degree detection unit 52 detects an accelerator opening degree Acc that represents an operation amount of an accelerator pedal AP provided in the vehicle, based on an input signal of the accelerator opening degree detection sensor Se2. In the present embodiment, the state where the accelerator pedal AP is not operated at all is detected as the accelerator opening Acc = 0%, and the state where the operation amount of the accelerator pedal AP is maximum is detected as the accelerator opening Acc = 100%.

2-3. Rotation speed detector 54
The rotational speed detector 54 calculates the rotational speed ωe and rotational angle of the rotational shaft of the rotating electrical machine MG based on the input signal of the rotational speed sensor Se3.
Further, since the wheel W is drivingly connected to the rotating shaft of the rotating electrical machine MG, and the rotational speed ωe of the rotating shaft of the rotating electrical machine MG is proportional to the vehicle speed, the rotational speed detecting unit 54 receives the input of the rotational speed sensor Se3. The vehicle speed is calculated based on the signal.

2-4. Torque command determination unit 53
Based on the accelerator opening Acc and the state of charge SOC, the torque command determining unit 53 determines the output torque command value To output to the rotating electrical machine MG within a range equal to or less than the maximum torque Tmax set for the rotating electrical machine MG. .
Then, as will be described later with reference to FIG. 4, the torque command determination unit 53 enters the state of charge SOC when the accelerator opening Acc is in the first region Y1 that is greater than or equal to zero and less than the predetermined first upper limit value X1. Regardless, the command value To of the output torque is determined so that the ratio of the output torque to the maximum torque Tmax increases as the accelerator opening Acc increases, and the accelerator opening Acc is equal to or greater than the first upper limit value X1 and a predetermined second upper limit. In the second region Y2 less than the value X2, the ratio of the output torque to the maximum torque Tmax increases as the accelerator opening Acc increases, and the ratio of the output torque to the maximum torque Tmax decreases as the state of charge SOC decreases. The command value To of the output torque is determined so as to decrease.

  In the present embodiment, when the accelerator opening degree Acc is in the third region Y3 that is not less than the second upper limit value X2 and not more than the maximum value, the torque command determining unit 53 determines that the accelerator opening degree Acc is not related to the state of charge SOC. The output torque command value To is determined so that the ratio of the output torque to the maximum torque Tmax increases as the value increases. In particular, the torque command determination unit 53 is configured to determine the output torque command value To as the maximum torque Tmax regardless of the state of charge SOC when the accelerator opening degree Acc is the maximum value (100%). ing. As will be described later with reference to FIG. 4, when the second upper limit value X2 is set to the maximum value (100%) of the accelerator opening Acc, the third region Y3 has the maximum value of the accelerator opening Acc ( 100%) only. In this case, the command value To of the output torque in the third region Y3 is configured to be determined to the maximum torque Tmax regardless of the state of charge SOC and the accelerator opening Acc.

In order to calculate such an output torque command value To, the torque command determination unit 53 according to the present embodiment sets a maximum torque Tmax according to the rotational speed ωe of the rotating electrical machine MG, as shown in FIG. Based on the maximum torque setting unit 40, the accelerator opening Acc, and the state of charge SOC, an output ratio determining unit 41 that determines a torque output ratio Kr that is a ratio of the output torque to the maximum torque Tmax, the maximum torque Tmax, and the torque output An output command value determining unit 42 that determines a command value To of the output torque based on the ratio Kr.
Hereinafter, the torque command determination unit 53 according to the present embodiment will be described in detail.

2-4-1. Maximum torque setting unit 40
As described above, the maximum torque setting unit 40 sets the maximum torque Tmax according to the rotation speed ωe of the rotating electrical machine MG. In the present embodiment, as shown in FIG. 3, the maximum torque setting unit 40 includes a maximum torque setting map in which the relationship between the maximum torque Tmax and the rotation speed ωe of the rotating electrical machine MG is set in advance. 40 sets the maximum torque Tmax based on the maximum torque setting map and the rotational speed ωe of the rotating electrical machine MG. Here, the maximum torque Tmax is a predetermined value determined in advance so as to correspond to the maximum torque that can be output by the rotating electrical machine MG at the rotational speed ωe of each rotating electrical machine MG.

  The maximum torque setting map shown in FIG. 3 is an example of a map that is used when the shift position is in the drive range. However, the maximum torque setting unit 40 is a maximum torque setting map that is used when the shift position is in the reverse drive range. The maximum torque setting map is switched and used depending on the shift position.

2-4-2. Output ratio determining unit 41
As described above, the output ratio determination unit 41 determines the torque output ratio Kr, which is the ratio of the output torque to the maximum torque Tmax, based on the accelerator opening Acc and the state of charge SOC. In the present embodiment, as shown in FIG. 4, the output ratio determination unit 41 sets a torque output ratio setting in which the relationship of the torque output ratio Kr to the accelerator opening Acc is preset for each of a plurality of different predetermined charging states SOC. Has a map. Then, the output ratio determination unit 41 determines the torque output ratio Kr in the torque output ratio setting map for each predetermined charging state SOC based on the accelerator opening Acc, and the torque output ratio corresponding to each predetermined charging state SOC. A torque output ratio Kr corresponding to the state of charge SOC is set, for example, by performing linear interpolation based on Kr and the state of charge SOC.

  FIG. 4 shows a setting example of a torque output ratio setting map corresponding to each predetermined state of charge SOC of 80% or more, 50%, and 10% or less. In practice, a value obtained by linear interpolation is used between maps that are more finely defined between 80% and 10% or that are defined in a plurality of stages.

  Although not shown, the output ratio determination unit 41 includes a three-dimensional torque output ratio setting map in which the relationship between the accelerator opening Acc and the torque output ratio Kr with respect to the state of charge SOC is preset. Also good. The output ratio determination unit 41 may be configured to set the torque output ratio Kr based on the torque output ratio setting map, the accelerator opening Acc, and the state of charge SOC. Alternatively, the output ratio determining unit 41 includes a higher order function in which the relationship between the accelerator opening degree Acc and the torque output ratio Kr with respect to the state of charge SOC is preset, and the higher order function, the accelerator opening degree Acc, and the state of charge. The torque output ratio Kr may be set based on the SOC.

  Then, as shown in the example of FIG. 4, when the accelerator opening degree Acc is in the first region Y1 that is greater than or equal to zero and less than the predetermined first upper limit value X1, the output ratio determination unit 41 depends on the state of charge SOC. Instead, the torque output ratio Kr is determined to a larger value as the accelerator opening Acc increases. Further, when the accelerator opening degree Acc is within the second region Y2 that is equal to or greater than the first upper limit value X1 and less than the predetermined second upper limit value X2, the output ratio determination unit 41 is charged more as the accelerator opening degree Acc increases. The torque output ratio Kr is determined to a smaller value as the state SOC becomes lower.

  In the present embodiment, the output ratio determining unit 41 determines that the accelerator opening degree is not dependent on the state of charge SOC, when the accelerator opening degree Acc is in the third region Y3 not less than the second upper limit value X2 and not more than the maximum value. The torque output ratio Kr is determined to a larger value as Acc increases. In particular, the output ratio determining unit 41 is configured to determine the torque output ratio Kr to the maximum value (100%) regardless of the state of charge SOC when the accelerator opening degree Acc is the maximum value (100%). Has been.

  As shown in FIG. 4, when the accelerator opening Acc is within the first region Y1, the torque output ratio setting map for each predetermined state of charge SOC shows the torque output ratio Kr even if the state of charge SOC changes as shown in FIG. Is set not to change. Therefore, in this first region Y1, the torque output ratio Kr is simply set to increase as the accelerator opening Acc increases.

  On the other hand, in the torque output ratio setting map for each predetermined state of charge SOC, when the accelerator opening degree Acc is in the second area Y2, the torque output is increased as the accelerator opening degree Acc increases as in the first area Y1. The ratio Kr is set to increase, and the torque output ratio Kr is set to decrease as the state of charge SOC decreases. In the example shown in FIG. 4, the torque output ratio setting map for each predetermined state of charge SOC indicates that the accelerator opening Acc is within the second region Y2 and the state of charge SOC is within a predetermined range of 10% to 80%. In this case, the torque output ratio Kr is set to decrease as the state of charge SOC decreases. When the state of charge SOC is 80% or more and when the state of charge SOC is 10% or less, the torque output ratio Kr is set so as not to change even if the state of charge SOC changes. The predetermined range of the 10% to 80% state of charge SOC is set corresponding to the normal use range of the state of charge SOC of the battery BT, for example. Therefore, in the normal use range of the state of charge SOC of the battery BT, the driver can experience a decrease in the state of charge SOC. Thus, the output ratio determination unit 41 may be configured to determine the torque output ratio Kr to a smaller value as the state of charge SOC becomes lower, at least within the range of the predetermined state of charge SOC.

  Further, the torque output ratio setting map for each predetermined state of charge SOC indicates that when the accelerator opening Acc is in the third region Y3 and is the maximum value (100%), as shown in FIG. Even if the state SOC changes, the torque output ratio Kr is set to 100%. In the example shown in FIG. 4, the second upper limit value X2 is set to the maximum value (100%) of the accelerator opening Acc, and the third region Y3 is only the maximum value (100%) of the accelerator opening Acc. ing. In this case, the torque output ratio Kr in the third region Y3 is configured to be determined to the maximum value (100%) regardless of the state of charge SOC and the accelerator opening Acc.

2-4-3. Output command value determination unit 42
As described above, the output command value determining unit 42 determines the output torque command value To based on the maximum torque Tmax and the torque output ratio Kr. In the present embodiment, as shown in FIG. 2, the output command value determination unit 42 is configured to set a value obtained by multiplying the maximum torque Tmax and the torque output ratio Kr to the output torque command value To. .

  The output command value determination unit 42 may be configured to set the value obtained by performing the upper limit restriction process for the output torque command value To calculated as described above as the output torque command value To. . The upper limit value is set according to, for example, the temperature of the rotating electrical machine MG, the temperature of the inverter IN, or the failure state of the rotating electrical machine MG and the inverter IN.

2-5. Inverter control unit 50
The inverter control unit 50 is configured to output a plurality of torque command values such as the output torque command value To to the rotating electrical machine MG based on the rotation angle of the rotating electrical machine MG and the coil current. The inverter IN is driven and controlled by outputting a signal for driving the switching element on and off. The inverter control unit 50 detects the rotation angle of the rotating shaft of the rotating electrical machine MG based on the input signal of the rotational speed sensor Se3, and detects the coil current flowing through the coil of the rotating electrical machine MG based on the input signal of the current sensor Se5. To do. Note that the torque command value output to the rotating electrical machine MG may include a command value other than the output torque command value To, such as a torque command for canceling the cogging torque.

[Other Embodiments]
Finally, other embodiments of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.

(1) In the above embodiment, the case where the torque command determination unit 53 includes the maximum torque setting unit 40, the output ratio determination unit 41, and the output command value determination unit 42 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the torque command determination unit 53 does not include the maximum torque setting unit 40, the output ratio determination unit 41, and the output command value determination unit 42, but the accelerator opening degree Acc, the state of charge SOC, and the rotational speed ωe of the rotating electrical machine MG. As long as the command value To of the output torque to be output to the rotating electrical machine MG is determined within the range of the maximum torque Tmax set for the rotating electrical machine MG, any calculation method may be used. For example, as shown in FIG. 5, the torque command determination unit 53 has a relationship between the output torque command value To and the rotational speed ωe of the rotating electrical machine MG and the accelerator opening Acc in advance for each of a plurality of different predetermined charging states SOC. You may comprise so that the set three-dimensional or two-dimensional torque command value setting map may be provided. Then, the torque command determination unit 53 determines the output torque command value To in the torque command value setting map of each predetermined state of charge SOC based on the rotational speed ωe of the rotating electrical machine MG and the accelerator opening Acc, and each predetermined Based on the command value To of the output torque corresponding to the state of charge SOC and the state of charge SOC, linear interpolation may be performed to set the command value To of the output torque corresponding to the state of charge SOC. .

  FIG. 5A shows a setting example of a torque command value setting map corresponding to a charge state SOC of 80% or more, and FIG. 5B shows a torque corresponding to a charge state SOC of 50%. A setting example of a command value setting map is shown, and FIG. 5C shows a setting example of a torque command value setting map corresponding to a state of charge SOC of 10% or less. 5 (a), (b), and (c), the accelerator opening Acc 0%, the accelerator opening Acc 20% set to the first upper limit value X1, and the accelerator set to the second upper limit value X2 are shown. A setting example of a torque command value setting map at an opening degree Acc of 100% and an accelerator opening degree Acc of 70% in the second region Y2 near the middle between the first upper limit value X1 and the second upper limit value X2 is shown.

  As shown in this figure, the output torque command value To for the accelerator opening Acc of 70% in the second region Y2 is changed from FIG. 5A in which the charged state SOC is 80% or more to FIG. (B) FIG. 5C where the state of charge SOC is 10% or less, and it can be seen that the charging state SOC is set to a smaller value as the state of charge decreases. On the other hand, the command value To of the output torque of the accelerator opening Acc 20% in the first region Y1 set to the first upper limit value X1 is shown in FIGS. 5 (a) to 5 (b) and FIG. 5 (c). Thus, it can be seen that even if the state of charge SOC changes, it is set so as not to change. Further, as shown in FIGS. 5 (a) to 5 (b) and FIG. 5 (c), the command value To of the output torque with the accelerator opening Acc being the maximum value (100%) is changed in the state of charge SOC. It can be seen that the maximum torque Tmax is not changed.

(2) In the above embodiment, the case where the torque command determination unit 53 sets the first upper limit value X1 and the second upper limit value X2 to predetermined values has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the torque command determination unit 53 may be configured to change the first upper limit value X1 and the second upper limit value X2 according to operating conditions of the rotating electrical machine MG such as the rotational speed ωe of the rotating electrical machine MG. . For example, as shown in FIG. 6, the torque command determination unit 53 may be configured to change the first upper limit value X1 and the second upper limit value X2 according to the rotational speed ωe of the rotating electrical machine MG. Similarly, the torque command determination unit 53 may be configured to change the first upper limit value X1 and the second upper limit value X2 according to the vehicle speed.

  In this case, the first upper limit value X1 may be set such that it decreases as the rotational speed ωe of the rotating electrical machine MG increases and the first region Y1 is narrowed. The case where the setting of the first region Y1 is necessary is particularly a case where slow driving such as during traffic jams or parking is performed, and when the rotational speed ωe of the rotating electrical machine MG is low. On the other hand, as the vehicle speed increases, the necessity for setting the first region Y1 decreases, and the necessity for the second region Y2 for experiencing the decrease in the state of charge SOC increases. By setting in this way, the first region Y1 and the second region Y2 can be appropriately set according to the rotational speed ωe of the rotating electrical machine MG.

  Further, the second upper limit value X2 may be set such that it decreases as the rotational speed ωe of the rotating electrical machine MG increases and the third region Y3 is expanded. The case where the setting of the third region Y3 is required is a case where the vehicle is traveling at a somewhat high vehicle speed, such as during overtaking, and a case where the rotational speed ωe of the rotating electrical machine MG is high. On the other hand, as the vehicle speed decreases, the necessity for setting the third region Y1 wider decreases, and the necessity for the second region Y2 for experiencing the decrease in the state of charge SOC increases. By setting in this way, the third region Y3 and the second region Y2 can be appropriately set according to the rotational speed ωe of the rotating electrical machine MG.

  In this case, as shown in FIGS. 6A, 6B, and 6C, the torque command determination unit 53 determines the rotation speeds ωe of a plurality of different predetermined rotating electrical machines MG (in the illustrated example, ωe = ωe1, ωe2 , Ωe3 (ωe1 <ωe2 <ωe3)) may be configured to include a torque output ratio setting map in which the relationship between the accelerator opening Acc and the torque output ratio Kr with respect to the state of charge SOC is set in advance. Then, the torque command determination unit 53 determines the torque output ratio Kr in the torque output ratio setting map of the rotational speed ωe of each predetermined rotating electrical machine MG based on the accelerator opening Acc and the state of charge SOC, and each predetermined rotation Based on the torque output ratio Kr corresponding to the rotational speed ωe of the electric machine MG and the rotational speed ωe of the rotary electric machine MG, a linear complement calculation is performed, for example, and the torque output ratio Kr corresponding to the rotational speed ωe of the rotary electric machine MG. May be set. Alternatively, the torque command determination unit 53 includes a torque output ratio setting map for each rotation speed ωe of the rotating electrical machine MG (for example, 0 ≦ ωe <ωa, ωa ≦ ωe <ωb, ωb ≦ ωe), and The torque output ratio Kr may be set using a torque output ratio setting map corresponding to the rotational speed ωe.

(3) In the above embodiment, when the accelerator opening degree Acc is the maximum value, the torque command determination unit 53 determines the output torque command value To as the maximum torque Tmax regardless of the state of charge SOC. The case has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the torque command determination unit 53 may be configured to determine a torque other than the maximum torque Tmax as the output torque command value To when the accelerator opening Acc is the maximum value. In this case, when the accelerator opening degree Acc is the maximum value, the torque command determining unit 53 sets the output torque command value To within the range of the maximum torque Tmax or less based on the accelerator opening degree Acc and the state of charge SOC. It may be configured to determine.

(4) In the above embodiment, the case where the maximum torque Tmax set for the rotating electrical machine MG is set according to the rotational speed ωe of the rotating electrical machine MG has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the maximum torque Tmax set for the rotating electrical machine MG may be configured to be set according to other information, for example, the state of charge SOC, in addition to the rotational speed ωe of the rotating electrical machine MG. For example, when the state of charge SOC is close to 0% (for example, 5% or less), the maximum torque that can be output by the rotating electrical machine MG decreases even if the rotating electrical machine MG is controlled to output the maximum torque. Therefore, the maximum torque Tmax set in the rotating electrical machine MG may be reduced as the state of charge SOC approaches 0%.

(5) In the above embodiment, the torque output ratio Kr and the output torque command value To shown in FIGS. 4, 5, and 6 have been described as an example in which values of zero or more are set. . However, the embodiment of the present invention is not limited to this. That is, the torque output ratio Kr and the output torque command value To may be set to values less than zero.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a vehicle drive control device that is controlled by a vehicle drive device that includes a rotating electrical machine that is drivingly connected to a wheel and a power storage device that stores electric power supplied to the rotating electrical machine. .

1: Vehicle drive device 30: Vehicle drive control device 40: Maximum torque setting unit 41: Output ratio determination unit 42: Output command value determination unit 50: Inverter control unit 51: Charge state detection unit 52: Accelerator opening degree detection unit 53: Torque command determination unit 54: Rotational speed detection unit ωe: Rotational speed AP of the rotating electrical machine: Accelerator pedal Acc: Accelerator opening BT: Battery (power storage device)
IN: Inverter Kr: Torque output ratio MG: Rotating electrical machine O: Output shaft SOC: Charge state Se1: Battery charge state detection sensor Se2: Accelerator opening detection sensor Se3: Rotational speed sensor Se4: Shift position sensor Se5: Current sensor Tmax: Maximum torque To: Output torque command value W: Wheel X1: First upper limit value X2: Second upper limit value Y1: First region Y2: Second region Y3: Third region

Claims (4)

A vehicle drive control device that controls a vehicle drive device that includes a rotating electrical machine that is drivingly connected to a wheel and a power storage device that stores electric power supplied to the rotating electrical machine,
An accelerator opening detector that detects an accelerator opening representing an operation amount of an accelerator pedal provided in the vehicle;
A charge state detection unit for detecting a charge state of the power storage device;
A torque command determining unit that determines a command value of output torque to be output to the rotating electrical machine within a range equal to or less than a maximum torque set in the rotating electrical machine based on the accelerator opening and the charged state;
The torque command determination unit
When the accelerator opening is within a first region that is greater than or equal to zero and less than a predetermined first upper limit value, the ratio of the output torque to the maximum torque increases as the accelerator opening increases regardless of the state of charge. Decide the command value of the output torque so as to increase,
If the accelerator opening is in the second region that is greater than or equal to the first upper limit value and less than the predetermined second upper limit value, the ratio of the output torque to the maximum torque increases as the accelerator opening increases, Determining the output torque command value so that the ratio of the output torque to the maximum torque decreases as the state of charge decreases.
Vehicle drive control device.   2. The vehicle drive according to claim 1, wherein when the accelerator opening is a maximum value, the torque command determination unit determines the command value of the output torque as the maximum torque regardless of the state of charge. Control device.   When the second upper limit value is less than the maximum value of the accelerator opening, and the accelerator opening is in a third region not less than the second upper limit value and not more than the maximum value, the torque command determination unit, 3. The vehicle drive control according to claim 1, wherein a command value of the output torque is determined such that a ratio of the output torque to the maximum torque increases as the accelerator opening increases regardless of a state of charge. apparatus. The torque command determination unit is a ratio of the output torque to the maximum torque based on a maximum torque setting unit that sets a maximum torque according to a rotation speed of the rotating electrical machine, the accelerator opening, and the state of charge. An output ratio determining unit that determines a torque output ratio; and an output command value determining unit that determines a command value of the output torque based on the maximum torque and the torque output ratio;
The output ratio determining unit
When the accelerator opening is within the first region, regardless of the state of charge, the torque output ratio is determined to a larger value as the accelerator opening increases,
4. The torque output ratio according to claim 1, wherein when the accelerator opening is within the second region, the torque output ratio is determined to be a value that increases as the accelerator opening increases and decreases as the state of charge decreases. The vehicle drive control device according to claim 1.

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