JP2015066965A - Control method of inverted pendulum type moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress output voltage reduction of a battery and improve continuity of inversion control.SOLUTION: A control method of an inverted pendulum type moving body of the invention is a control method of the inverted pendulum type moving body which moves in a posture as an inverted-pendulum by driving a motor by power supplied from a battery. The method comprises: a step for detecting a motor rotation number and a motor output torque, and at least one of a battery residual amount, a battery temperature, and a battery deterioration degree; and a step for controlling the motor rotation number and the motor output torque so that an operation point is included in an output possible area based on at least one of the battery residual amount, the battery temperature, and the battery deterioration degree, when the operation point based on the motor rotation number and the motor output torque is in a power running area and exceeds an output possible area specified by at least one of the battery residual amount, the battery temperature, and the battery deterioration degree.

Description

  The present invention relates to an inverted moving body control method, and more particularly to a technique for controlling a motor by using battery power.

  As disclosed in Patent Document 1, an inverted moving body for carrying a human being is disclosed. Such an inverted moving body is equipped with a battery and moves by rotating a wheel by driving a motor using electric power supplied from the battery.

JP 2010-149576

  As described above, the applicant of the present application has found a problem described below in an inverted mobile body that is equipped with a battery and moves using the power of the battery. The problem will be described below. In addition, the content demonstrated below is the content which the applicant of this application examined newly, and does not demonstrate a prior art.

  The applicant of the present application has reduced the size of the battery (for example, a cell) as a technique for realizing a reduction in size and weight of an inverted moving body that is mounted with a battery and moves by driving a motor using the power of the battery. To reduce the number of serial or parallel). However, if the battery is downsized, the output performance of the battery will be reduced accordingly.

  Here, there is a problem that the output performance of the battery is deteriorated depending on usage conditions such as the temperature, the remaining amount, and the deterioration degree of the battery. This is not a problem for an inverted moving body that has a large battery and controls with sufficient power, but to make it smaller and lighter, the battery can be made smaller and electrically This is a problem for an inverted mobile body that does not have sufficient capacity.

  First, when the battery is reduced in size, it does not have sufficient electrical capacity. Therefore, if the output performance of the battery decreases due to fluctuations in usage conditions, as shown in FIG. Will also decrease. The reason is that the battery has an internal resistance, and the more the current is drawn from the battery to drive the motor with a larger motor output, the lower the output voltage of the battery is. In other words, if the motor output is increased while the output performance (output voltage) of the battery is reduced due to fluctuations in usage conditions, the output voltage of the battery will drop to a very low level by drawing a larger current. End up. As a result, there is a problem that the voltage required for the operation is not supplied to the ECU that controls the driving of the motor, and the ECU stops operating (system stops).

  The present invention has been made on the basis of the above-described knowledge, and provides an inverted moving body control method capable of suppressing a decrease in the output voltage of the battery and improving the continuity of the inverted control. Objective.

  A method for controlling an inverted moving body according to a first aspect of the present invention is a method for controlling an inverted moving body that moves in an inverted manner by driving a motor with electric power supplied from a battery. And at least one of the output torque, the remaining amount of the battery, the temperature, and the degree of deterioration, and the operating point based on the rotational speed and the output torque of the motor is in the power running region, and the battery When the output possible range specified by at least one of the remaining amount, the temperature, and the deterioration degree is exceeded, the operating point is determined based on at least one of the remaining amount, the temperature, and the deterioration degree of the battery. And limiting the rotational speed and output torque of the motor so as to be included in the possible region.

  According to each aspect of the present invention described above, it is possible to provide a control method for an inverted moving body that can suppress a decrease in the output voltage of the battery and improve the continuity of the inverted control.

It is a figure which shows the external structure of the inverted moving body which concerns on embodiment. It is a block diagram which shows the internal structure of the inverted moving body which concerns on embodiment. It is a figure which shows the open end voltage characteristic of a battery. It is a figure which shows the internal resistance characteristic of a battery. It is a figure which shows the battery model of a battery, and the supply voltage by it. It is a figure which shows the output characteristic of the motor which concerns on embodiment. It is a flowchart which shows the motor output suppression process of the inverted moving body which concerns on embodiment. It is a figure which shows the output characteristic of a motor.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Specific numerical values and the like shown in the following embodiments are merely examples for facilitating understanding of the invention, and are not limited thereto unless otherwise specified. In the following description and drawings, matters obvious to those skilled in the art are omitted or simplified as appropriate for the sake of clarity.

<Embodiment of the Invention>
With reference to FIG. 1, the external structure of the inverted moving body 1 according to the present embodiment will be described. FIG. 1 is a diagram showing an external configuration of an inverted moving body 1 according to the present embodiment.

  The inverted moving body 1 is configured so that the passenger who has gripped the handle 4 and has boarded the step cover 3 applies a load in the front-rear direction of the inverted moving body 1. The attitude angle (pitch angle) is detected using a sensor. Then, based on this detection result, the inverted moving body 1 drives a motor that rotates the left and right wheels 2 so as to maintain the inverted state of the inverted moving body 1. That is, the inverted moving body 1 maintains the inverted state of the inverted moving body 1 when a passenger who has boarded the step cover 3 applies a load forward to tilt the inverted moving body 1 forward. The left and right wheels are accelerated so that when the occupant inclines backward by tilting the inverted mobile body 1 by applying a load backward, the inverted mobile body 1 is accelerated backward so as to maintain the inverted state. The motor which rotates 2 is driven.

  Then, with reference to FIG. 2, the internal structure of the inverted mobile body 1 which concerns on this Embodiment is demonstrated. FIG. 2 is a block diagram showing an internal configuration of the inverted moving body 1 according to the present embodiment.

  The inverted moving body 1 includes ECUs (Electronic Control Units) 11 and 12, motors 13 and 14, rotation angle sensors 15 to 18, batteries 19 and 20, current sensors 21 to 24, and gyro sensors 25 and 26.

  The inverted mobile unit 1 has a duplex (redundant) control system of the control system of the 0 system and the control system of the 1 system in order to ensure the stability of the control of the inverted mobile body 1. System. That is, the 0-system control system and the 1-system control system have the same configuration, and the operation of the components is also the same. Therefore, in principle, the 0-system ECU 11 and the 1-system ECU 12 control the inverted mobile body 1 in synchronization (with the same control content). The 0-system control system includes an ECU 11, rotation angle sensors 15 and 16, a battery 19, current sensors 21 and 22, and a gyro sensor 25. The first control system includes an ECU 12, rotation angle sensors 17 and 18, a battery 20, current sensors 23 and 24, and a gyro sensor 26. In the embodiment of the present invention, the case of a dual system will be described, but the present invention can also be applied to a simple single system or a triple system or more.

  Each of the ECUs 11 and 12 is based on the angular velocity signal around the pitch axis output from each of the gyro sensors 25 and 26, and as described above, the motors 13 and 14 maintain the inverted state of the inverted mobile body 1 as described above. To control. Each of the ECUs 11 and 12 has a CPU (Central Processing Unit) and a storage unit, and executes processing as each of the ECUs 11 and 12 in the present embodiment by executing a program stored in the storage unit. That is, the program stored in each storage part of ECU11, 12 contains the code | cord | chord for making CPU perform the process in each of ECU11,12 in this Embodiment. The storage unit includes, for example, an arbitrary storage device that can store the program and various types of information used for processing in the CPU. As the storage device, for example, at least one or more arbitrary storage devices such as a memory and a hard disk may be used.

  The ECU 11 calculates a command value for controlling the motor 13 and performs PWM (Pulse Width Modulation) control of the motor 13 based on the calculated command value. Specifically, the ECU 11 includes an inverter (not shown). The inverter 11 generates a drive current based on a command value for the motor 13 from the current supplied from the battery 19 and supplies the drive current to the motor 13. To do. Further, the ECU 11 calculates a command value for controlling the motor 14 and performs PWM control of the motor 14 based on the calculated command value. Specifically, the ECU 11 has an inverter. The inverter 11 generates a drive current based on a command value for the motor 14 from the current supplied from the battery 19 and supplies the drive current to the motor 14.

  The ECU 12 calculates a command value for controlling the motor 13, and performs PWM control of the motor 13 based on the calculated command value. Specifically, the ECU 12 has an inverter (not shown). The inverter 12 generates a drive current based on a command value for the motor 13 from the current supplied from the battery 20 and supplies the drive current to the motor 13. To do. Moreover, ECU12 calculates the command value which controls the motor 14, and performs PWM control of the motor 14 based on the calculated command value. Specifically, the ECU 12 includes an inverter. The inverter 12 generates a drive current based on a command value for the motor 14 from the power supplied from the battery 20 and supplies the drive current to the motor 14.

  With this operation, current is drawn from each of the batteries 19 and 20 by the ECUs 11 and 12 and supplied to the motors 13 and 14 as drive current.

  Here, each of the ECUs 11 and 12 integrates the angular velocity (pitch angular velocity) around the pitch axis of the inverted movable body 1 indicated by the angular velocity signal output from each of the gyro sensors 25 and 26, thereby inverting the movable body 1. Is calculated, and a command value for controlling the motors 13 and 14 is generated so as to maintain the inverted moving body 1 in an inverted state based on the calculated attitude angle.

  Further, each of the ECUs 11 and 12 generates a command value so as to feedback-control the motor 13 based on a rotation angle signal indicating the rotation angle of the motor 13 output from each of the rotation angle sensors 15 and 17. Further, each of the ECUs 11 and 12 generates a command value so as to feedback-control the motor 14 based on a rotation angle signal indicating the rotation angle of the motor 14 output from each of the rotation angle sensors 16 and 18.

  Each of the motors 13 and 14 is a double winding motor. The motor 13 is driven by a drive current supplied from the ECU 11 and the ECU 12. By driving the motor 13, for example, the left wheel 2 of the inverted moving body 1 rotates. The motor 14 is driven by a drive current supplied from the ECU 11 and the ECU 12. By driving the motor 14, for example, the right wheel 2 of the inverted moving body 1 rotates.

  The rotation angle sensor 15 detects the rotation angle of the motor 13, generates a rotation angle signal indicating the detected rotation angle, and outputs the rotation angle signal to the ECU 11. The rotation angle sensor 16 detects the rotation angle of the motor 14, generates a rotation angle signal indicating the detected rotation angle, and outputs the rotation angle signal to the ECU 11. The rotation angle sensor 17 detects the rotation angle of the motor 13, generates a rotation angle signal indicating the detected rotation angle, and outputs the rotation angle signal to the ECU 12. The rotation angle sensor 18 detects the rotation angle of the motor 14, generates a rotation angle signal indicating the detected rotation angle, and outputs the rotation angle signal to the ECU 12. As the rotation angle sensors 15 to 18, for example, an arbitrary sensor among sensors capable of detecting the rotation angle of the motors 13 and 14 such as an encoder and a resolver may be used.

  The ECU 11 calculates the rotation speed of the motor 13 based on the rotation angle indicated by the rotation angle signal output from the rotation angle sensor 15, and the motor 14 based on the rotation angle indicated by the rotation angle signal output from the rotation angle sensor 16. The number of rotations is calculated. The ECU 12 calculates the rotation speed of the motor 13 based on the rotation angle indicated by the rotation angle signal output from the rotation angle sensor 17, and based on the rotation angle indicated by the rotation angle signal output from the rotation angle sensor 18. The number of rotations is calculated.

  The current sensor 21 detects a drive current supplied from the ECU 11 to the motor 13, generates a current amount signal indicating the detected amount of drive current, and outputs the current amount signal to the ECU 11. The current sensor 22 detects a drive current supplied from the ECU 11 to the motor 14, generates a current amount signal indicating the detected amount of drive current, and outputs the current amount signal to the ECU 11. The current sensor 23 detects the drive current supplied from the ECU 12 to the motor 13, generates a current amount signal indicating the detected amount of drive current, and outputs the current amount signal to the ECU 12. The current sensor 24 detects a drive current supplied from the ECU 12 to the motor 14, generates a current amount signal indicating the detected amount of drive current, and outputs the current amount signal to the ECU 12.

  In general, the motor output torque is proportional to the drive current. Therefore, the ECU 11 calculates the output torque of the motor 13 based on the current amount of the drive current indicated by the current amount signal output from the current sensor 21, and the current of the drive current indicated by the current amount signal output from the current sensor 22. Each output torque of the motor 14 is calculated based on the amount. Further, the ECU 12 calculates the output torque of the motor 13 based on the current amount of the drive current indicated by the current amount signal output from the current sensor 23, and the current of the drive current indicated by the current amount signal output from the current sensor 24. Each output torque of the motor 14 is calculated based on the amount.

  Here, the calculation method of the output torque of the motors 13 and 14 is not limited to this. For example, the ECUs 11 and 12 may calculate the output torque from the command value. Further, a torque sensor for detecting the torque of each of the motors 13 and 14 is provided for each of the motors 13 and 14, and the ECUs 11 and 12 output the torques of the motors 13 and 14 detected by the torque sensors. You may make it recognize as a torque.

  Each of the gyro sensors 25, 26 is an angular velocity (around the pitch axis) with respect to the front-rear direction of the inverted mobile body 1 when a passenger applies a load to the step cover 3 in the front-rear direction of the inverted mobile body 1. Are detected, and angular velocity signals indicating the detected angular velocities are output to the ECUs 11 and 12, respectively.

  The battery 19 supplies power necessary for the operation to each device of the 0-system control system. That is, as described above, this electric power is used for the operation of the ECU 11 and the generation of a drive current for driving the motors 13 and 14 by the ECU 11. In addition, although illustration of connection relation is omitted, this electric power is also supplied to devices that require electric power other than the ECU 11, such as the rotation angle sensors 15 and 16 and the gyro sensor 25.

  Further, the battery 19 generates a remaining amount signal indicating the remaining amount of the battery 19 (for example, SOC: State Of Charge), and outputs the remaining amount signal to the ECU 11 via an SM (System Management Bus) bus. The battery 19 includes a temperature sensor (not shown), generates a temperature signal indicating the temperature of the battery 19 monitored by the temperature sensor, and outputs the temperature signal to the ECU 11 via the SM bus. Further, the battery 19 generates a deterioration level signal indicating the deterioration level of the battery 19 and outputs it to the ECU 11 via the SM bus.

  The battery 20 supplies power necessary for the operation to each device of the 1-system control system. That is, as described above, this electric power is used for the operation of the ECU 12 and the generation of the drive current for driving the motors 13 and 14 by the ECU 12. In addition, although the illustration of the connection relationship is omitted, this electric power is also supplied to devices that require electric power other than the ECU 11, such as the rotation angle sensors 17 and 18 and the gyro sensor 26.

  Further, the battery 20 generates a remaining amount signal indicating the remaining amount of the battery 20 (for example, SOC: State Of Charge), and outputs the remaining amount signal to the ECU 12 via an SM (System Management Bus) bus. The battery 20 has a temperature sensor (not shown), generates a temperature signal indicating the temperature of the battery 20 monitored by the temperature sensor, and outputs the temperature signal to the ECU 12 via the SM bus. Further, the battery 20 generates a deterioration level signal indicating the deterioration level of the battery 20 and outputs it to the ECU 12 via the SM bus.

  Here, the batteries 19 and 20 have a CPU (not shown), and the CPU calculates the remaining amount and the degree of deterioration and controls the generation and output of signals as described above. The remaining amount and the degree of deterioration may be calculated by any known method. For example, the remaining amount of the batteries 19 and 20 may be determined by a clone counter method.

  In the present embodiment, even if the output performance of the batteries 19 and 20 is reduced due to changes in the usage conditions (temperature, remaining amount and deterioration degree of the batteries 19 and 20), the battery 19 By limiting the output (output torque and rotation speed) of the motors 13 and 14 so as to be permitted by the output performance of 20, the output voltage of the batteries 19 and 20 and the operation stop of the ECUs 11 and 12 due to this are suppressed. To do.

  Next, output suppression control by the inverted moving body 1 according to the present embodiment will be described with reference to FIGS. FIG. 3 is a diagram illustrating open-circuit voltage characteristics of the batteries 19 and 20. FIG. 4 is a diagram showing the internal resistance characteristics of the batteries 19 and 20. FIG. 5 is a diagram showing the battery models of the batteries 19 and 20 and the supply voltage thereby. FIG. 6 is a diagram illustrating output characteristics of the motors 13 and 14.

  As shown in FIG. 3, the battery generally has a lower open-circuit voltage Vb as the remaining battery level decreases, and the open-circuit voltage Vb increases as the remaining battery level increases. As shown in FIG. 4, the battery generally has an internal resistance Rb that increases as the remaining amount of the battery decreases, and decreases as the battery remaining amount increases. As shown in FIG. 4, the battery generally has an internal resistance Rb that increases as the temperature of the battery decreases, and decreases as the temperature of the battery increases. In general, the battery has a higher internal resistance Rb as the battery deteriorates, and the internal resistance Rb decreases as the battery does not deteriorate.

  Here, the battery can be modeled as shown in FIG. Therefore, based on this model, the voltages (respective output voltages of the batteries 19 and 20) Vin supplied from the batteries 19 and 20 to the 0-system control system and the 1-system control system, respectively, are shown in FIG. As also shown, it can be calculated by the following equation (1).

  Supply voltage Vin = battery open end voltage Vb−battery internal resistance Rb × supply current I (1)

  That is, by subtracting the value obtained by multiplying the internal resistance Rb of the battery 19 and the current (output current of the battery 19) I supplied to the 0-system control system from the open-circuit voltage Vb of the battery 19, the 0-system control is performed. The voltage Vin supplied to the system can be calculated. Further, by subtracting a value obtained by multiplying the internal resistance Rb of the battery 20 and the current (output current of the battery 20) I supplied to the control system 1 from the open-circuit voltage Vb of the battery 20, the control of the 1 system The voltage Vin supplied to the system can be calculated.

  Further, according to Expression (1), it can be seen that as the open circuit voltage Vb of each of the batteries 19 and 20 decreases, the voltage Vin supplied to each of the 0-system and 1-system control systems also decreases. Further, according to the expression (1), it can be seen that as the internal resistance Rb of each of the batteries 19 and 20 increases, the voltage Vin supplied to each of the 0-system and 1-system control systems also decreases. In other words, in consideration of the characteristics shown in FIGS. 3 and 4, the voltage Vin supplied to each of the 0-system and 1-system control systems decreases as the remaining amount of each of the batteries 19 and 20 decreases. become. Further, as the temperature of each of the batteries 19 and 20 decreases, the voltage Vin supplied to each of the 0-system and 1-system control systems also decreases. Further, as the deterioration of each of the batteries 19 and 20 progresses, the voltage Vin supplied to each of the 0-system and 1-system control systems also decreases.

  Therefore, as the remaining amount of each of the batteries 19 and 20 decreases, the output possible area of the motors 13 and 14 decreases as shown in FIG. Further, as the temperature of each of the batteries 19 and 20 decreases, the output possible area of the motors 13 and 14 decreases as shown in FIG. Further, as the deterioration of each of the batteries 19 and 20 progresses, the output possible area of the motors 13 and 14 decreases as shown in FIG. In other words, the output possible area of the motors 13 and 14 can be estimated from the remaining amount, temperature, and deterioration degree of the batteries 19 and 20. Here, the output possible region is a range in which the operating points of the motors 13 and 14 can be obtained without causing a decrease in the output of the batteries 19 and 20 such that the ECUs 11 and 12 stop operating. The operating points of the motors 13 and 14 correspond to points plotted in the coordinate system when one axis is the output torque and the other axis is the rotation speed. Therefore, when the output possible area of the motors 13 and 14 is decreasing, the ECUs 11 and 12 are driven from the batteries 19 and 20 so that the operating points of the motors 13 and 14 are positioned in the output possible area accordingly. It is necessary to limit the amount of current drawn to generate.

  Therefore, in the present embodiment, each of the ECUs 11 and 12 is based on the remaining amount, temperature, and degree of deterioration of each of the batteries 19 and 20, and the output of the motor (output torque and rotation speed) is within an output possible region. Thus, in order to generate a drive current for the motors 13 and 14, the amount of current drawn from the batteries 19 and 20 is limited. Hereinafter, the method will be described more specifically with reference to FIG.

  In order to suppress the operation stop of the ECUs 11 and 12 due to the voltage drop of the batteries 19 and 20, the supply voltage Vin from the batteries 19 and 20 should not be a voltage at which the ECUs 11 and 12 stop operating. In other words, it is only necessary to prevent the ECUs 11 and 12 from becoming lower than the lowest voltage (hereinafter also referred to as “limit voltage”) among the operable voltages. For example, the limit voltage may be determined in advance according to the specifications of the ECUs 11 and 12, the measurement result in advance, or the like.

  Therefore, when the operating points of the motors 13 and 14 exceed the output possible region (when the supply voltage Vin from the batteries 19 and 20 is less than the limit voltage), the ECUs 11 and 12 ), The amount of current drawn to generate the drive current from the batteries 19 and 20 is limited so that the supply voltage Vin from the batteries 19 and 20 does not become less than the limit voltage. That is, the ECUs 11 and 12 limit the current I supplied from the batteries 19 and 20 so that the supply voltage Vin from the batteries 19 and 20 becomes the limit voltage.

  Here, as described above, the output possible region can be estimated from the remaining amount of the batteries 19 and 20, the temperature, and the degree of deterioration. Therefore, the ECUs 11 and 12 estimate the output possible area based on the remaining amount of the batteries 19 and 20, the temperature, and the degree of deterioration, and determine whether the operating points of the motors 13 and 14 exceed the output possible area. It may be determined. That is, the ECUs 11 and 12 appropriately update and recognize the output possible region according to changes in the remaining amount of the batteries 19 and 20, the temperature, and the degree of deterioration. As described above, the output torque is calculated from the current amount of the drive current indicated by the current amount signals output from the current sensors 21 to 24, and the rotation speed is determined by the rotation angle signals output from the rotation angle sensors 15 to 18. It is calculated from the indicated rotation angle.

  The determination as to whether or not the operating point of the motors 13 and 14 exceeds the output possible region may be realized by any specific method. For example, in each storage unit of the ECUs 11 and 12, the maximum value of the output torque in the output possible region at the number of rotations is determined from the remaining amount of the batteries 19 and 20, the temperature and the deterioration degree, and the number of rotations of the motors 13 and 14. Information that can be derived (tables, calculation formulas, etc.) is stored in advance, and the ECUs 11 and 12 derive the maximum value of the output torque using the information, and the output torques of the motors 13 and 14 are It may be determined whether or not the maximum value is exceeded.

  The ECUs 11 and 12 apply the limit voltage to the “supply voltage Vin” in the equation (1), and set the “open end voltage Vb” to the open end of the current batteries 19 and 20 estimated from the remaining amount of the batteries 19 and 20. The current I is calculated by applying the voltage Vb and applying the current internal resistance Rb of the batteries 19 and 20 estimated from the remaining amount of the batteries 19 and 20, the temperature, and the degree of deterioration to the “internal resistance Rb”. The calculated current I is a current amount in which the supply voltage Vin from the batteries 19 and 20 does not become less than the limit voltage (the supply voltage Vin from the batteries 19 and 20 becomes the limit voltage). Then, the ECUs 11 and 12 limit the amount of current drawn to generate the drive current from the batteries 19 and 20 so that the current I supplied from the batteries 19 and 20 becomes the calculated current I.

  For example, in each of the storage units of the ECUs 11 and 12, information (tables, calculation formulas, and the like) that can derive a command value that becomes the calculated current I from the current I supplied from the batteries 19 and 20 from the calculated current I. ) In advance, and the ECUs 11 and 12 may use the information to derive the command value from the calculated current I. In other words, this information prevents the supply voltage Vin from the batteries 19 and 20 from being less than the limit voltage by drawing a current for generating a drive current from the batteries 19 and 20 based on the derived command value. It is assumed that the command value that can be used is calculated. Further, the input to this information is not limited to the calculated current I, and further, by adding the rotational speed of the motors 13 and 14, a command value that becomes the current I considering the back electromotive voltage with respect to the rotational speeds of the motors 13 and 14. May be calculated.

  The estimation of the current open-circuit voltage Vb of the batteries 19 and 20 from the remaining amount of the batteries 19 and 20 is the battery indicated by the remaining amount signals output from the batteries 19 and 20 in the storage units of the ECUs 11 and 12, respectively. Information (tables, calculation formulas, etc.) that can derive the open-circuit voltage Vb of the batteries 19 and 20 at that time is stored in advance from the remaining amounts of 19 and 20, and the ECUs 11 and 12 store the information. The open end voltage Vb may be derived from the remaining amount by using it.

  In addition, the estimation of the current internal resistance Rb of the batteries 19 and 20 from the remaining amount of the batteries 19 and 20, the temperature, and the degree of deterioration is also performed in the storage units of the ECUs 11 and 12. Information that can derive the internal resistance Rb of the batteries 19 and 20 at that time from the remaining amount, temperature, and degree of deterioration of the batteries 19 and 20 indicated by the quantity signal, the temperature signal, and the deterioration level signal (table and The calculation formula etc. may be stored in advance, and the ECUs 11 and 12 may use the information to derive the remaining amount, the temperature, the degree of deterioration, or the internal resistance Rb.

  Note that the information stored in these storage units may be created by measuring the correspondence in the information in advance.

  Then, with reference to FIG. 7, the motor output suppression process of the inverted moving body 1 which concerns on this Embodiment is demonstrated. FIG. 7 is a flowchart showing the motor output suppression process of the inverted moving body 1 according to the present embodiment. In the following, the processing in the ECU 11 will be described as an example, but the same processing is also performed in the ECU 12. Since it is obvious that the process in the ECU 12 is the same process, the description thereof is omitted. For example, in the following description, the ECU 11, the rotation angle sensors 15 and 16, the battery 19, the current sensors 21 and 22, and the gyro sensor 25 are the ECU 12, the rotation angle sensors 17 and 18, the battery 20, the current centers 23 and 24, and The gyro sensor 26 is replaced.

  The ECU 11 monitors the rotation speed and output torque of each of the motors 13 and 14, the remaining amount of the battery 19, the temperature, and the degree of deterioration (S1). Specifically, the ECU 11 acquires the rotation angle signal output from each of the rotation angle sensors 15 and 16, and based on the rotation angle indicated by the acquired rotation angle signal, the ECU 11 determines the rotation speed of each of the motors 13 and 14. calculate. Further, the ECU 11 calculates the output torque of the motor 13 based on the current amount indicated by the current amount signal output from the current sensor 21. Further, the ECU 11 calculates the output torque of the motor 14 based on the current amount indicated by the current amount signal output from the current sensor 22. Further, the ECU 11 recognizes the remaining amount indicated by the remaining amount signal output from the battery 19 as the remaining amount of the battery 19. Further, the ECU 11 recognizes the temperature indicated by the temperature signal output from the battery 19 as the temperature of the battery 19. Further, the ECU 11 recognizes the deterioration level indicated by the deterioration level signal output from the battery 19 as the deterioration level of the battery 19.

  The ECU 11 determines whether or not the current operating point of the motors 13 and 14 is a power running region (S2). Specifically, the ECU 11 determines whether or not the signs of the calculated output torques of the motors 13 and 14 and the calculated rotation speeds of the motors 13 and 14 are the same. The ECU 11 determines that the output of the motor is in the powering region when the output torque and the number of rotations are the same, and if the output torque and the number of rotations are different, the output of the motor is not in the powering region (in the regeneration region). Is determined).

  When it is determined that the current operating point of the motors 13 and 14 is the power running region (S2: Yes), the ECU 11 determines whether or not the current motor output is an output possible region (S3). Specifically, the ECU 11 determines whether or not the operating point based on the calculated output torque of the motors 13 and 14 and the calculated rotation speed of the motors 13 and 14 is within the output possible region as shown in FIG. Determine whether.

  When it is determined that the current operating point of the motors 13 and 14 is the output possible region (S3: Yes), the ECU 11 starts (continues) the control of the inverted moving body 1 with the current motor output (S4). .

  When it is determined that the current operating point of the motors 13 and 14 is not in the output possible region (S3: No), the ECU 11 causes the motor 19 so that the supply voltage Vin from the battery 19 to the 0-system control system is less than the limit voltage. The output is limited (S5). That is, as described above, the ECU 11 limits the amount of current drawn to generate a drive current from the battery 19. Then, the ECU 11 starts (continues) the control of the inverted moving body 1 with the limited motor output (S4).

  When it is determined that the current operating point of the motors 13 and 14 is not the power running region (regeneration region) (S2: No), the ECU 11 determines whether or not the regenerative operation (regenerative brake) is permitted (S6). ). That is, in the inverted moving body 1 according to the present embodiment, a regenerative operation may be performed. The regenerative operation may be a charging method in which the battery 19 is charged with the electric power generated by the motors 13 and 14 during the operation in the regenerative region. The inverted moving body 1 is provided with a regenerative resistor so that the motor is operated during the regenerative region It is good also as the discharge system which converts the electric power which generate | occur | produces into heat with regenerative resistance, and discharges, and it is good also as a system which combined those systems. For example, when implementing the charging method, the ECU 11 determines that regeneration is not permitted when it is determined that the amount of charge of the battery 19 is greater than a predetermined threshold value and has reached the charging limit. The charge amount of the battery 19 may be specified based on the remaining amount indicated by the remaining amount signal from the battery 19. When the ECU 11 determines that the temperature in the inverted moving body 1 is higher than a predetermined threshold due to the discharge heat and that a higher temperature is not preferable when the discharge method is performed. Determine that regeneration is not allowed. The temperature indicated by the temperature signal from the battery 19 may be used as the temperature in the inverted mobile body 1, and a temperature sensor is separately provided in the inverted mobile body 1 (for example, near the regenerative resistor). The temperature detected by the temperature sensor may be used.

  If it is determined that the regenerative operation is allowed (S6: Yes), the ECU 11 starts (continues) the control of the inverted moving body 1 with the current motor output (S4).

  If it is determined that the regenerative operation is not allowed (S6: No), the ECU 11 limits the charge amount or the discharge amount (S7). For example, the ECU 11 switches the path in a circuit so that the inflow destination of the regenerative current from the motors 13 and 14 does not become the battery 19 or the regenerative resistor, thereby preventing further charging or discharging. Then, the ECU 11 starts (continues) the control of the inverted moving body 1 with the current motor output (S4).

  As described above, in the present embodiment, the operating point based on the rotation speed and the output torque of the motors 13 and 14 is in the powering region, and the remaining amount of the batteries 19 and 20, the temperature, and the deterioration degree are determined. When the output possible range specified by at least one is exceeded, the motor 13 is configured so that the operating point is included in the output possible range based on at least one of the remaining amount of the batteries 19 and 20, the temperature, and the deterioration level. , 14 and the output torque are limited.

  According to this, current consumption of the batteries 19 and 20 for driving the motors 13 and 14 can be reduced to within an allowable range corresponding to the output possible region. Therefore, the output voltage drop of the batteries 19 and 20 can be suppressed, and the continuity of the inversion control can be improved.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

  In the above embodiment, the example in which the control system is duplicated into the 0 system and the 1 system has been described, but the present invention is not limited to this. The control system may not be multiplexed and may be multiplexed more than triple.

  In the above embodiment, the internal resistance Rb of the batteries 19 and 20 and the output possible region of the motors 13 and 14 are estimated based on all of the remaining amount, temperature, and degree of deterioration. , And at least one of the degree of deterioration. However, it is preferable to estimate the internal resistance Rb and the output possible region by using all of the remaining amount, the temperature, and the degree of deterioration, as in the above-described embodiment, and thereby estimate them with higher accuracy. Can do.

DESCRIPTION OF SYMBOLS 1 Inverted type mobile body 2 Wheel 3 Step cover 4 Handle 11, 12 ECU
13, 14 Motor 15, 16, 17, 18 Rotation angle sensor 19, 20 Battery 21, 22, 23, 24 Current sensor 25, 26 Gyro sensor

Claims (1)

A method for controlling an inverted moving body that moves in an inverted manner by driving a motor with electric power supplied from a battery,
Detecting at least one of the rotational speed and output torque of the motor, the remaining amount of the battery, the temperature, and the degree of deterioration;
When the operating point based on the rotational speed and output torque of the motor is in the power running region and exceeds the output possible region specified by at least one of the remaining amount, temperature, and deterioration degree of the battery, Limiting the rotational speed and output torque of the motor so that the operating point is included in the output possible region based on at least one of the remaining battery level, temperature, and degree of deterioration;
A method for controlling an inverted moving body comprising:

Images