JP2012055029A - Electric motor control system, generator control system and electric generator control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency by operating a motor generator 2 in a region with high efficiency.SOLUTION: A generation torque Tp corresponding to a rotation frequency N set based on efficiency of the motor generator 2 and a target torque Tc is stored in a drive generation control unit 8 of a drive generation control system 1. The generation torque Tp is a torque in an operating region with high efficiency or near the operating region. The drive generation control unit 8 determines the generation torque Tp corresponding to the rotation frequency N and the target torque Tc to allow the motor generator 2 to operate so as to generate the generation torque Tp continuously or intermittently according to a rate of the target torque Tc with respect to the generation torque Tp. Thereby, the motor generator 2 generates the generation torque Tp continuously or intermittently to supply the target torque Tc required for running or braking a vehicle to a propeller shaft 14.

Description

  The present invention relates to a motor control system for controlling a motor, a generator control system for controlling a generator, and a motor generator control system for controlling a motor generator.

  Japanese Patent Laid-Open No. 2006-345677 discloses that a motor for driving driving wheels of a vehicle is provided with a transmission, and the reduction ratio of the transmission is changed so that the operation loss of the motor is minimized, thereby improving the operation efficiency of the motor. A vehicle drive device is described.

JP 2006-345677 A

  The above-mentioned conventional apparatus changes the reduction ratio of the transmission so that the operation loss of the motor is minimized. In other words, the combination of the rotational speed of the motor and the torque is changed by changing the reduction ratio of the transmission. It is set so that the motor operating loss is minimized.

  However, when the speed reduction ratio is changed, the rotation speed and torque of the motor change in conjunction with each other. Therefore, combinations of rotation speed and torque that can be set are naturally limited. Therefore, in the case of the above-described conventional device, there is a possibility that the combination of the set rotational speed and torque may not be included in the high-efficiency operation region that exists inherently as the characteristics of the motor. It is difficult to increase the operation frequency in the area.

  Accordingly, an object of the present invention is to provide an electric motor control system capable of improving the efficiency by increasing the frequency at which the electric motor operates in a high efficiency region. Another object of the present invention is to provide a generator control system and a motor generator control system capable of improving the efficiency by increasing the frequency of operation of the generator and the motor generator in a high efficiency region. .

  In order to achieve the above object, a first aspect of the present invention is an electric motor control system, which includes an electric motor and electric motor control means.

  The electric motor is coupled to the output shaft. The electric motor control means sets the electric motor to an intermittent driving state in which an electric motor torque higher than the target driving torque is intermittently generated so as to supply a predetermined target driving torque to the output shaft while continuing to rotate the output shaft.

  In the above configuration, the electric motor is set in an intermittent drive state by the electric motor control means and drives the output shaft. The motor set to the intermittent drive state operates intermittently so as to intermittently generate a motor torque higher than the target drive torque (a state of operating to generate a motor torque higher than the target drive torque) The target drive torque is supplied to the output shaft. For this reason, by setting the motor torque to be generated intermittently to an appropriate torque, the operating conditions of the motor when driving the output shaft (the rotational speed of the motor and the target drive torque necessary for driving the output shaft) are changed to the motor. The electric motor can be operated in the high-efficiency operation region regardless of whether it is included in the high-efficiency operation region (region defined by the rotation speed and torque of the motor) inherently present as a characteristic of . Therefore, the efficiency of the electric motor can be improved by increasing the frequency of operation in a high-efficiency operating region regardless of the operating conditions of the electric motor.

  Further, the electric motor control means may set the electric motor by switching between a continuous driving state in which the target driving torque is continuously generated and the intermittent driving state.

  In the above configuration, the electric motor is set to a continuous drive state or an intermittent drive state by the motor control means and drives the output shaft. In the continuous drive state, the electric motor continuously operates so as to continuously generate the target drive torque and supplies the target drive torque to the output shaft. For this reason, when the operating condition of the motor when driving the output shaft is included in the high-efficiency operation region, the motor is operated in the high-efficiency operation region by setting the motor to a continuous drive state. Can do. On the other hand, when the operating condition of the motor is not included in the high-efficiency operation region, the motor is set to the intermittent drive state, and the motor torque to be generated intermittently is set to an appropriate torque. It can be operated in a highly efficient operating area. As described above, since the electric motor can be set in either a continuous driving state or an intermittent driving state, the frequency of operation in a high-efficiency operating region is increased regardless of the operating conditions of the motor, thereby improving the efficiency of the electric motor. Can do.

  The electric motor control system may further include a storage unit in which driving torque information indicating a correspondence relationship between the rotational speed of the electric motor and the target driving torque and the driving torque is preset and stored. In this case, the motor control means determines the drive torque corresponding to the rotational speed of the motor and the target drive torque when driving the output shaft, using the drive torque information stored in the storage means, and the determined drive torque If the motor and the target drive torque are the same, the motor is set to the continuous drive state. If the drive torque is higher than the target drive torque, the motor is set to the intermittent drive state, and the drive torque is intermittently set as the motor torque. To generate.

  In the above configuration, the drive torque generated in the electric motor is preset and stored in correspondence with the rotation speed of the electric motor and the target drive torque. The motor control means determines the drive torque according to the rotation speed of the motor when driving the output shaft and the target drive torque. If the determined drive torque and the target drive torque are the same, the motor is continuously driven. And the motor is continuously operated so that the drive torque (target drive torque) is continuously generated. When the driving torque is higher than the target driving torque, the electric motor is set in an intermittent driving state, and the electric motor is operated intermittently so that the driving torque is generated intermittently. For this reason, it is possible to increase the frequency at which the electric motor operates in the high-efficiency operating region by setting in advance the torque that is highly efficient at an arbitrary rotational speed as the driving torque, thereby reliably improving the efficiency of the electric motor.

  The motor control system may include a transmission, second storage means, and transmission control means. In this case, the transmission is connected to the electric motor and the output shaft. The second storage means presets and stores gear ratio information indicating the gear ratio of the transmission corresponding to the rotational speed of the electric motor and the target drive torque. The transmission control means determines the speed ratio corresponding to the rotational speed of the motor and the target driving torque when driving the output shaft, using the speed ratio information stored in the second storage means, and determines the transmission. Change to gear ratio. The motor control means determines the drive torque using the rotation speed of the motor and the target drive torque after the transmission gear ratio is changed.

  In the above configuration, the transmission gear ratio is set in advance corresponding to the rotational speed of the electric motor and the target drive torque. The transmission control means determines and changes the speed ratio according to the rotational speed of the electric motor and the target drive torque when driving the output shaft. The motor control means determines the drive torque according to the rotation speed of the motor and the target drive torque changed by changing the speed ratio, and compares the determined drive torque with the target drive torque changed by changing the speed ratio, Set the motor to a continuous or intermittent drive state. That is, the transmission control means changes the speed of the motor and the target drive torque by changing the speed ratio in accordance with the operating condition of the motor, and then changes the speed of the motor and the target drive torque. Then, the motor control means sets the operation state of the motor to a continuous or intermittent drive state. Thus, since the rotation speed of the electric motor can be freely changed, the range that can be set as a combination of the rotation speed and the torque at which the electric motor operates is expanded as compared with the case where only the torque is changed. Therefore, it is possible to further improve the efficiency of the electric motor by increasing the frequency at which the electric motor operates in the highly efficient operation region. In addition, by setting the gear ratio information in advance so that the rotation speed of the motor changes to the rotation speed at which the efficiency of the motor is high, the frequency of the motor operating in the high-efficiency operation region is increased, thereby ensuring the efficiency of the motor. Can be improved.

  Further, the motor control means may repeatedly set a drive rotation state in which the motor is driven with the motor torque in the intermittent drive state and a non-drive rotation state in which the motor is not driven in a predetermined cycle, and drive rotation in the predetermined cycle. The time ratio occupied by the state may be set based on the ratio of the target drive torque to the motor torque.

  In the configuration described above, when the electric motor is set to the intermittent drive state, the drive rotation state and the non-drive rotation state are repeated at a predetermined cycle. The drive rotation state is a state in which the output shaft is driven so as to continuously generate the motor torque. The non-driven rotation state is a state in which the output shaft is not driven, that is, a state in which the rotation shaft of the motor rotates idly without generating torque, and loss occurs due to rotation of the rotation shaft or the like in the motor in the non-drive rotation state. The time ratio that the drive rotation state occupies in the predetermined cycle is set based on the ratio of the target drive torque to the motor torque. If the time ratio occupied by the drive rotation state in a predetermined cycle is the ratio of the target drive torque to the motor torque, the theoretical torque supplied to the output shaft without considering the loss in the non-drive rotation state is The torque obtained by multiplying the motor torque by the time ratio occupied by the drive rotation state, that is, the target drive torque. For this reason, when the loss in the non-drive rotation state is taken into account, in order to compensate for the loss in the non-drive rotation state in the drive rotation state, the time ratio occupied by the drive rotation state in a predetermined cycle is the target drive torque with respect to the motor torque. Greater than the percentage of Thus, by setting the time ratio occupied by the drive rotation state in a predetermined cycle based on the ratio of the target drive torque to the motor torque, the target drive torque can be reliably supplied to the output shaft in the intermittent drive state. .

  A 2nd aspect of this invention is a generator control system, Comprising: A generator and a generator control means are provided.

  The generator is connected to the input shaft. The generator control means generates power by intermittently generating a generator resistance torque stronger than the target braking torque so as to supply the predetermined braking torque to the input shaft while continuing to rotate the input shaft of the generator. Set the power generation state.

  In the above configuration, the generator is set to the intermittent power generation state by the generator control means to generate power. The generator operates intermittently so as to intermittently generate a generator resistance torque having an absolute value larger than the target braking torque (so as to generate a generator resistance torque having an absolute value larger than the target braking torque). Repeat the operation state and the non-operation state) to supply the target braking torque to the input shaft. For this reason, by setting the generator resistance torque that is generated intermittently to an appropriate torque, the operating conditions of the generator when generating power by following the input shaft (for generator rotation speed and input shaft braking) Regardless of whether or not the required target braking torque is included in the high-efficiency operating region (region defined by the rotational speed and torque of the generator) inherently present as a characteristic of the generator It can be operated in a highly efficient operating area. Therefore, regardless of the operating conditions of the generator, it is possible to increase the frequency of operation in a high-efficiency operating region and improve the efficiency of the generator.

  Further, the generator control means may set the generator by switching between a continuous power generation state in which the target braking torque is continuously generated to generate power and the intermittent power generation state.

  In the above configuration, the generator is set to a continuous power generation state or an intermittent power generation state by the power generator control means to generate power. In the continuous power generation state, the generator continuously operates so as to continuously generate the target braking torque and supplies the target braking torque to the input shaft. For this reason, if the operating conditions of the generator when generating power by rotating following the input shaft are included in the high-efficiency operating region, the generator is made more efficient by setting the generator to a continuous power generation state. It can be operated in a high operating range. On the other hand, when the operating conditions of the generator are not included in the high-efficiency operating region, the generator is set to an intermittent power generation state, and the generator resistance torque that is generated intermittently is set to an appropriate torque. The generator can be operated in the highly efficient operating region. As described above, since the generator can be set to either a continuous power generation state or an intermittent power generation state, the frequency of operation in a high-efficiency operation region is increased regardless of the operation conditions of the generator, thereby improving the efficiency of the generator. Can be improved.

  Further, the generator control system may include a storage unit in which braking torque information indicating a correspondence relationship between the rotational speed of the generator and the target braking torque and the braking torque is set and stored in advance. In this case, the generator control means uses the braking torque information stored in the storage means to determine the braking torque corresponding to the rotational speed of the generator and the target braking torque when generating power by being driven by the input shaft. When the determined braking torque and the target braking torque are the same, the generator is set to the continuous power generation state, and when the braking torque is stronger than the target braking torque, the generator is set to the intermittent power generation state, A braking torque is intermittently generated as a generator resistance torque.

  In the above configuration, the braking torque to be generated by the generator is set and stored in advance corresponding to the rotational speed of the generator and the target braking torque. The generator control means determines the braking torque according to the rotational speed of the generator and the target braking torque when generating power by being driven by the input shaft, and when the determined braking torque and the target braking torque are the same The generator is set to the continuous power generation state, and the generator is continuously operated so that the braking torque (target braking torque) is continuously generated. When the absolute value of the braking torque is larger than the absolute value of the target braking torque, the generator is set to an intermittent power generation state, and the generator is operated intermittently so that the braking torque is generated intermittently. For this reason, it is possible to improve the efficiency of the generator by increasing the frequency at which the generator operates in the high-efficiency operation region by presetting the torque that becomes highly efficient at an arbitrary rotational speed as the braking torque. it can.

  The generator control system may include a transmission, second storage means, and transmission control means. The transmission is connected to the generator and the input shaft. In the second storage means, gear ratio information indicating a gear ratio of the transmission corresponding to the rotational speed of the generator and the target braking torque is preset and stored. The transmission control means uses the speed ratio information stored in the second storage means to determine the speed ratio corresponding to the rotational speed of the generator and the target braking torque when the power is generated by following the input shaft, Change the transmission to the determined gear ratio. The generator control means determines the braking torque by using the rotation speed of the generator and the target braking torque after the transmission gear ratio is changed.

  In the above configuration, the transmission gear ratio is set in advance corresponding to the rotational speed of the generator and the target braking torque. The transmission control means determines and changes the speed ratio in accordance with the rotational speed of the generator and the target braking torque when generating power by being driven by the input shaft. The generator control means determines the braking torque according to the generator speed and the target braking torque changed by changing the transmission ratio, and compares the determined braking torque with the target braking torque changed by changing the transmission ratio. Then, the generator is set to a continuous or intermittent power generation state. That is, after changing the speed of the generator and the target braking torque by changing the gear ratio according to the operating conditions of the generator, the changed speed of the generator and the target braking torque are changed. Accordingly, the generator control means sets the operation state of the generator to a continuous or intermittent power generation state. Thus, since the rotation speed of a generator can be changed freely, the range which can be set as a combination of the rotation speed and torque which a generator operates is expanded compared with the case where only a torque is changed. Therefore, it is possible to further improve the efficiency of the generator by increasing the frequency with which the generator operates in the high-efficiency operation region. Further, by setting the gear ratio information in advance so that the rotational speed of the generator changes to the rotational speed at which the generator becomes highly efficient, the frequency at which the generator operates in the high-efficiency operating region is increased. It is possible to reliably improve the efficiency.

  The generator control means repeatedly sets a braking rotation state in which the generator resistance torque is generated in the generator in the intermittent power generation state and a non-braking rotation state in which the generator does not generate power in a predetermined cycle. Alternatively, the time ratio of the braking rotation state in the predetermined cycle may be set based on the ratio of the target braking torque to the generator resistance torque.

  In the above configuration, when the generator is set to the intermittent power generation state, the generator repeats the braking rotation state and the non-braking rotation state at a predetermined cycle. The braking rotation state is a state in which power is generated so that the generator resistance torque is continuously generated. The non-braking rotation state is a state in which no power is generated, that is, a state in which the rotating shaft of the generator is idle without generating torque, and a loss occurs due to rotation of the rotating shaft or the like in the generator in the non-braking rotation state. The time ratio occupied by the braking rotation state in the predetermined cycle is set based on the ratio of the target braking torque to the generator resistance torque. Assuming that the proportion of time that the braking rotation state occupies in a predetermined cycle is the ratio of the target braking torque to the braking torque, the theoretical torque supplied to the input shaft when the loss in the non-braking rotation state is not taken into account A torque obtained by multiplying the generator resistance torque by the time ratio occupied by the braking rotation state, that is, the target braking torque. For this reason, when the loss in the non-braking rotation state is taken into account, in order to compensate for the loss in the non-braking rotation state in the braking rotation state, the time ratio occupied by the braking rotation state in the predetermined cycle is the target for the generator resistance torque. It becomes larger than the ratio of the braking torque. Thus, by setting the time ratio of the braking rotation state in the predetermined cycle based on the ratio of the target braking torque to the generator resistance torque, the target braking torque can be reliably supplied to the input shaft in the intermittent power generation state. Can do.

  A third aspect of the present invention is a motor generator control system that controls a motor generator, and includes a motor generator and a motor generator control means.

  The motor generator is connected to the input / output shaft, and can be set to a driving state for driving the input / output shaft and a power generation state for generating power by being driven by the input / output shaft. When driving the input / output shaft, the motor generator control means sets the motor generator to a drive state and supplies a predetermined target drive torque to the input / output shaft while continuing to rotate the input / output shaft. When the motor generator is set to an intermittent drive state that intermittently generates a motor generator torque higher than the target drive torque and is driven to generate power by driving the input / output shaft, the motor generator is set to the power generation state and the input / output shaft A motor generator resistance torque stronger than the target braking torque is intermittently generated so as to supply a predetermined target braking torque to the input / output shaft while continuing the rotation, and the intermittent power generation state is set to generate electric power.

  In the above configuration, when the input / output shaft is driven, the motor generator is set to the drive state by the motor generator control means and is set to the intermittent drive state to drive the output shaft. The motor generator operates intermittently so as to intermittently generate a motor generator torque higher than the target drive torque (a state and an operation that operate so as to generate a motor generator torque higher than the target drive torque). The target drive torque is supplied to the input / output shaft. On the other hand, when the motor generator is driven and rotated to generate power, the motor generator is set to the power generation state by the motor generator control means and is also set to the intermittent power generation state to generate power. The motor generator operates intermittently so as to intermittently generate a motor generator resistance torque having an absolute value larger than the target braking torque (generates a motor generator resistance torque having an absolute value larger than the target braking torque). The target braking torque is supplied to the input / output shaft. For this reason, by setting the motor generator torque or the motor generator resistance torque generated intermittently to an appropriate torque, the motor generator when driving the input / output shaft or generating power by rotating the input / output shaft The motor operating conditions (motor generator speed and target drive torque required for driving the input / output shaft, or motor generator speed and target braking torque required for input / output shaft braking) are characteristics of the motor generator. Regardless of whether or not it is included in the high-efficiency operating region (region defined by the rotational speed and torque of the motor-generator) that exists inherently as Can do. Therefore, the efficiency of the motor generator can be improved by increasing the frequency of operation in a highly efficient operating region regardless of the operating conditions of the motor generator.

  In addition, when the motor generator is set to the drive state, the motor generator control means switches between the continuous drive state that continuously generates the target drive torque and the intermittent drive state and sets the motor generator to the power generation state. In this case, the setting may be made by switching between a continuous power generation state in which the target braking torque is continuously generated to generate power and an intermittent power generation state.

  In the above configuration, the motor generator set to the drive state is set to the continuous drive state or the intermittent drive state by the motor generator control means to drive the input / output shaft. In the continuous drive state, the motor generator continuously operates so as to continuously generate the target drive torque and supplies the target drive torque to the input / output shaft. On the other hand, the motor generator set in the power generation state is set to the continuous power generation state or the intermittent power generation state by the motor generator control means to generate power. In the continuous power generation state, the motor generator continuously operates so as to continuously generate the target braking torque and supplies the target braking torque to the input / output shaft. For this reason, when the operating conditions of the motor generator when driving the input / output shaft or generating power by driving the input / output shaft are included in the high-efficiency operating region, the motor generator is in a continuously driven state. Alternatively, by setting the continuous power generation state, the motor generator can be operated in a highly efficient operation region. On the other hand, when the operating condition of the motor generator is not included in the high-efficiency operation region, the motor generator is set to the intermittent drive state or the intermittent power generation state, and the motor generator torque or motor power generation generated intermittently is set. By setting the machine resistance torque to an appropriate torque, the motor generator can be operated in the operating region with high efficiency. In this way, the motor generator can be set to either a continuous drive state or an intermittent drive state in the driving state, and can be set to either a continuous power generation state or an intermittent power generation state in the power generation state. Regardless of the operating conditions of the machine, the efficiency of the motor generator can be improved by increasing the frequency of operation in a highly efficient operating region.

  ADVANTAGE OF THE INVENTION According to this invention, the frequency which an electric motor, a generator, and a motor generator operate | move in the area | region where efficiency is high can be raised, and the efficiency of an electric motor, a generator, and a motor generator can be improved.

It is a block diagram which shows typically the drive electric power generation control system in 1st Embodiment. FIG. 4 is a conceptual diagram of an operating state and a resting state when the motor generator 2 intermittently generates a generated torque Tp and supplies the target torque Tc to the propeller shaft 14. It is a figure which shows the generation | occurrence | production torque table. It is a flowchart which shows the drive electric power generation control process in 1st Embodiment. It is a block diagram which shows typically the drive electric power generation control system in 2nd Embodiment. It is a flowchart which shows the drive electric power generation control process in 2nd Embodiment.

  A drive power generation control system (hereinafter simply referred to as a control system) according to a first embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the control system 1 controls the operation of a motor generator 2 mounted on the vehicle, and is mounted on the vehicle together with the motor generator 2. The control system 1 includes the motor generator 2, the battery 3, the inverter 4, the accelerator sensor 5, the brake sensor 6, the rotation speed sensor 7, and the drive power generation control unit 8.

  The motor generator 2 has a rotating shaft, and the rotating shaft is connected to the propeller shaft 14 and is connected to the drive wheel 17 via the differential gear 15 and the axle shaft 16. The motor generator 2 is controlled to operate according to the traveling state of the vehicle by a drive power generation control unit 8 described later. The motor generator 2 functions as both a drive unit that drives the drive wheel 17 and a power generation unit that generates power by being driven and rotated by the drive wheel 17. The motor generator 2 supplies a positive target torque (target drive torque) Tc required for traveling of the vehicle to the propeller shaft 14 in the driving state to drive and rotate the driving wheel 17, and rotates following the driving wheel 17 in the power generation state. Then, a negative target torque (target braking torque) Tc necessary for braking the vehicle is supplied to the propeller shaft 14 to brake the rotation of the drive wheels 17.

  The motor generator 2 continuously or intermittently generates positive or negative generated torque (drive torque, braking torque) Tp set in advance corresponding to the rotational speed N of the motor generator 2 and the target torque Tc, A target torque Tc is supplied to the propeller shaft 14. The generated torque Tp is set based on the efficiency characteristics of the motor generator 2 in a high-efficiency operating region (region defined by the rotation speed and torque) or in the vicinity of the operating region. Specifically, the target torque Tc is set as the generated torque Tp for the target torque Tc having an absolute value larger than the positive or negative first predetermined torque at an arbitrary rotational speed N. For the target torque Tc whose absolute value is larger than the positive or negative second predetermined torque whose absolute value is smaller than the first predetermined torque and whose absolute value is smaller than the positive or negative first predetermined torque, any rotational speed The torque having the highest efficiency or the torque in the vicinity of the torque is set as the generated torque Tp. Further, for the target torque Tc having a smaller absolute value than the positive or negative second predetermined torque, a torque obtained by multiplying the target torque Tc by a predetermined number (the ratio of the target torque Tc to the generated torque Tp is a predetermined ratio). Torque) is set as the generated torque Tp. The motor generator 2 has a characteristic that the efficiency when operating in a low rotation speed and low torque region is low. Further, a torque acting in the forward direction with respect to the rotation of the propeller shaft 14 is a positive torque, and a torque acting in the reverse direction is a negative torque.

  When the ratio of the target torque Tc to the generated torque Tp is 100% (when the generated torque Tp and the target torque Tc are the same), the motor generator 2 continuously generates the generated torque Tp (target torque Tc). Continuously operating (continuous driving state, continuous power generation state). On the other hand, when the ratio of the target torque Tc to the generated torque Tp is less than 100% (when the absolute value of the generated torque Tp is larger than the absolute value of the target torque Tc), an operation state for generating the generated torque Tp ( A driving rotation state and a braking rotation state) and a pause state where no torque is generated (a non-driving rotation state and a non-braking rotation state) are repeated intermittently at a predetermined cycle S (an intermittent driving state and an intermittent power generation state). The ratio of the time set in the operating state for the predetermined cycle S is set based on the ratio of the target torque Tc to the generated torque Tp (motor generator torque, motor generator resistance torque). The predetermined cycle S is set corresponding to the rotational speed N of the motor generator 2. The period S is preferably short enough that the motor generator 2 can be regarded as operating continuously, and the vehicle driver or the like does not perceive the intermittent operation of the motor generator 2 as vibration. As described above, the motor generator 2 set to be intermittently operated by the drive power generation control unit 8 repeats the operation state and the pause state in the cycle S corresponding to the rotation speed N, and the rotation speed N A generated torque Tp corresponding to the target torque Tc is generated, and the target torque Tc is supplied to the propeller shaft 14. That is, as long as the rotational speed N or the target torque Tc does not fluctuate, the motor generator 2 operates with the same generated torque Tp and period S. The drive power generation control unit 8 sets the generated torque and / or cycle of the motor generator 2 to the rotation speed N and the target torque Tc so that the motor generator 2 supplies the target torque Tc to the propeller shaft 14 in a certain period. The motor generator 2 may be operated intermittently while varying based on the generated torque Tp and the period S corresponding to.

  A state when the motor generator 2 operates intermittently will be described with reference to FIG. FIG. 2 shows that the motor generator 2 repeats the operating state and the resting state with a cycle S corresponding to the rotational speed N, and generates a generated torque Tp corresponding to the rotational speed N and the target torque Tc in the operating state. It is a conceptual diagram which shows the operation state and rest state when supplying the target torque Tc required for driving | running | working to the propeller shaft. FIG. 2A shows an operating state and a resting state when the generated torque Tpa is twice the target torque Tca (Tpa = 2Tca), and FIG. 2B shows that the generated torque Tpb is 4 times the target torque Tcb. The operation state and the resting state in the case of double (Tpb = 4Tcb) are shown.

  Although the motor generator 2 in the resting state has a loss due to the rotation of the rotating shaft of the motor generator 2, etc., in this embodiment, the motor generator 2 will be described assuming that the generated loss is negligible. If the loss is so large that it cannot be ignored, the time set for the operating state (operating time) and the time set for the resting state (resting time) are considered in consideration of the loss (the operating time increases as the loss increases). Should be set so that the pause time is shorter.

  As shown in FIG. 2A, when the generated torque Tpa is twice the target torque Tca (Tpa = 2Tca), the ratio of the operation time Son to the predetermined period S is the ratio of the target torque Tc to the generated torque Tp. Therefore, the operation time Son is Son = S / 2, and the pause time Soff is Soff = S / 2. Since the generated torque Tpa is generated for 1/2 hour in the predetermined cycle S, the torque generated by the motor generator 2 in the predetermined cycle S is Tpa / 2, that is, the target torque Tca. As shown in FIG. 2B, when the generated torque Tpb is four times the target torque Tcb (Tpb = 4Tcb), the operation time Son is Son = S / 4, and the rest time Soff is Soff. = 3S / 4. Since the generated torque Tpb is generated for ¼ hour in the predetermined cycle S, the torque generated by the motor generator 2 in the predetermined cycle S is Tpb / 4, that is, the target torque Tcb.

  The battery 3 stores electric power charged at a charging stand or the like, or electric power generated by the motor generator 2 set in a regenerative state. The inverter 4 supplies electric power necessary for driving from the battery 3 to the motor generator 2 set in the driving state in response to a control signal from the driving power generation control unit 8 described later, and the motor generator 2 set in the regenerative state. Is stored in the battery 3.

  The accelerator sensor 5 detects an operation amount A of the accelerator pedal operated by the driver of the vehicle every predetermined time. The brake sensor 6 detects the operation amount B of the brake pedal operated by the driver of the vehicle every predetermined time. The rotation speed sensor 7 detects the rotation speed N of the motor generator 2 every predetermined time.

  The drive power generation control unit 8 includes a drive power generation information storage unit (storage means) 9 and a CPU (Central Processing Unit, motor control means, generator control means, motor generator control means) 10.

  The drive power generation information storage unit 9 is configured by a recording medium such as a RAM (Random Access Memory), for example, and stores various programs and various data including a drive power generation control process execution program for the CPU 10 to execute the drive power generation control process. Is done. The drive power generation control process execution program includes a generated torque table and various arithmetic expressions used for the drive power generation control process. In the generated torque table, as shown in FIG. 3, information (drive torque information, braking torque information) indicating the correspondence between the rotational speed N of the motor generator 2 and the target torque Tc and the generated torque Tp is displayed. A generated torque Tp corresponding to the rotational speed N and the target torque Tc is preset and stored. The generated torque table and various arithmetic expressions may be stored in the drive power generation information storage unit 9 separately from the drive power generation control process execution program. Further, the information indicating the correspondence relationship between the rotational speed N of the motor generator 2 and the target torque Tc and the generated torque Tp may be a map, a predetermined arithmetic expression, or the like in addition to the generated torque table.

  The CPU 10 that executes the drive power generation control process functions as the calculation unit 11, the determination unit 12, and the drive power generation control unit 13.

  The calculation unit 11 includes first to third calculation units. The first calculation unit is based on the accelerator pedal operation amount A detected by the accelerator sensor 5, the brake pedal operation amount B detected by the brake sensor 6, and the rotational speed N of the motor generator 2 detected by the rotational speed sensor 7. Then, a target torque Tc necessary for running or braking the vehicle is calculated. The second calculation unit calculates the ratio of the target torque Tc to the generated torque Tp using the target torque Tc calculated by the first calculation unit and the generated torque Tp determined by the determination unit 12 to be described later. Calculate operating time and downtime. The third calculation unit calculates electric power necessary for the motor generator 2 to generate the generated torque Tp.

  The determination unit 12 refers to the generated torque table stored in the drive power generation information storage unit 9 and corresponds to the rotation speed N of the motor generator 2 detected by the rotation speed sensor 7 and the target torque Tc calculated by the calculation unit 11. The generated torque Tp to be determined is determined.

  When the operation amount A of the accelerator pedal detected by the accelerator sensor 5 is not 0 (when starting, accelerating, and traveling at a constant speed), the drive power generation control unit 13 sets the motor generator 2 to the drive state, and the accelerator pedal When the operation amount A is 0 (during deceleration), the motor generator 2 is set to the regenerative state. As a result, the motor generator 2 supplies a positive target torque Tc to the propeller shaft 14 to drive and rotate the drive wheels 17 when starting, traveling at a constant speed, and accelerating, and drives and rotates the propeller shaft 14 when decelerating. Then, the negative target torque Tc is supplied to the propeller shaft 14 to brake the rotation of the drive wheels 17.

  The drive power generation control unit 13 that sets the motor generator 2 to the drive state or the regenerative state sends a control signal for operating the motor generator 2 to the inverter 4 according to the ratio of the target torque Tc to the generated torque Tp calculated by the calculation unit 11. Output. Specifically, when the ratio of the target torque Tc to the generated torque Tp is 100% (when the generated torque Tp and the target torque Tc are the same), the generated torque Tp (target torque Tc) is continuously generated. Then, a control signal for continuously operating the motor generator 2 is output to the inverter 4. On the other hand, when the ratio of the target torque Tc to the generated torque Tp is less than 100% (when the absolute value of the generated torque Tp is larger than the absolute value of the target torque Tc), the operation time calculated by the calculation unit 11 and Control in which the motor generator 2 is intermittently operated so as to intermittently generate the generated torque Tp by repeating the operation state in which the generated torque Tp is generated and the inactive state in which the torque is not generated in a predetermined cycle S according to the stop time. The signal is output to the inverter 4. Thus, the motor generator 2 generates the generated torque Tp continuously or intermittently and supplies the target torque Tc to the propeller shaft 14.

  Next, drive power generation control processing executed by the CPU 10 will be described with reference to FIG. FIG. 4 is a flowchart showing the drive power generation control process. This process is repeatedly executed every predetermined time when the ignition key is in the ON state.

  When this process is started, the drive power generation control unit 13 sets the motor generator 2 to the drive state when the accelerator is on (when the accelerator pedal operation amount A detected by the accelerator sensor 5 is not 0), When the accelerator is off (when the accelerator pedal operation amount A detected by the accelerator sensor 5 is 0), the motor generator 2 is set to the regenerative state (step S1). Thus, the motor generator 2 functions as a drive unit that drives the drive wheels 17 when the accelerator is on, and functions as a power generation unit that generates power by rotating the drive wheels 17 when the accelerator is off.

  Next, the calculation unit 11 operates the accelerator pedal operation amount A detected by the accelerator sensor 5, the brake pedal operation amount B detected by the brake sensor 6, and the motor generator 2 rotational speed N detected by the rotational speed sensor 7. Based on the above, a target torque Tc necessary for traveling or braking of the vehicle is calculated (step S2).

  Next, the determination unit 12 refers to the generated torque table stored in the drive power generation information storage unit 9 and corresponds to the rotation speed N detected by the rotation speed sensor 7 and the target torque Tc calculated by the calculation unit 11. Generated torque Tp is determined (step S3).

  Next, drive power generation control unit 13 outputs a control signal for operating motor generator 2 to inverter 4 according to the ratio of target torque Tc to generated torque Tp calculated by calculation unit 11 (step S4). Specifically, when the ratio of the target torque Tc to the generated torque Tp is 100%, a control signal for operating the motor generator 2 to continuously generate the generated torque Tp (target torque Tc) is sent to the inverter 4. Output. On the other hand, when the ratio of the target torque Tc to the generated torque Tp is less than 100%, the generated torque is repeated in the predetermined period S according to the operating time and the pause time calculated by the calculation unit 11. A control signal for intermittently operating the motor generator 2 so as to intermittently generate Tp is output to the inverter 4. Thus, when the ratio of the target torque Tc to the generated torque Tp is 100%, the motor generator 2 continuously generates the generated torque Tp (target torque Tc) and supplies the target torque Tc to the propeller shaft 14. When the ratio of the target torque Tc to the generated torque Tp is less than 100%, the generated torque Tp is generated intermittently and the target torque Tc is supplied to the propeller shaft 14.

  As described above, according to the control system 1 of the present embodiment, the motor generator 2 operates so as to continuously or intermittently generate the generated torque Tp set in the highly efficient operation region or in the vicinity of the operation region. To do. That is, since the motor generator 2 operates in an operating region with high efficiency or in the vicinity of the operating region, the efficiency of the motor generator 2 can be improved.

  In the generated torque table, a generated torque Tp corresponding to an arbitrary rotational speed N and an arbitrary target torque Tc is set, but a target having an absolute value smaller than the arbitrary rotational speed N and the first predetermined torque. Only the generated torque Tp corresponding to the torque Tc may be set. In this case, the drive power generation control unit 8 determines whether or not the absolute value of the target torque Tc is greater than the absolute value of the first predetermined torque, and if so, the target torque Tc is continuously generated. When the motor generator 2 is operated, the generated torque Tp is determined with reference to the generated torque table, and the motor generator 2 is operated so as to intermittently generate the determined generated torque Tp.

  Next, the control system of 2nd Embodiment of this invention is demonstrated with reference to drawings. The present embodiment is different from the first embodiment in that a transmission 18 is connected to the motor generator 2 and the rotational speed N of the motor generator 2 can be changed. In addition, the same code | symbol is attached | subjected to the structure similar to the said 1st Embodiment, and the detailed description is abbreviate | omitted.

  As shown in FIG. 5, the control system 1 of the present embodiment includes a transmission 18, an actuator 19, and a transmission control unit 20.

  The transmission 18 is a stepped transmission, and is connected between the motor generator 2 and the propeller shaft 14.

  The actuator 19 changes the gear stage of the transmission 18 in accordance with a control signal from a transmission control unit 20 described later.

  The transmission control unit 20 includes a transmission information storage unit (second storage unit) 21 and a transmission control unit (transmission control unit) 22, and includes a target torque Tp and a gear stage mutually with the drive power generation control unit 8. Input and output information.

  The transmission storage unit 21 is configured by a recording medium such as a RAM (Random Access Memory), for example, and stores a transmission control processing execution program and various data for the transmission control unit 22 to execute the transmission control processing. The transmission control process execution program includes a gear stage table (gear ratio information) indicating gear stages corresponding to the rotational speed N of the motor generator 2 and the target torque Tc. The gear stage table may be stored in the transmission information storage unit 21 separately from the transmission control process execution program.

  The transmission control unit 22 refers to the gear stage table stored in the transmission information storage unit 21, selects a gear stage corresponding to the rotational speed N of the motor generator 2 and the target torque Tc, and sets the gear stage of the transmission 18. A control signal for changing to the selected gear stage is output to the actuator 19. Thereby, the transmission 18 is changed to a gear stage corresponding to the rotational speed N of the motor generator 2 and the target torque Tc by the actuator 19.

  The calculation unit 11 of the drive power generation control unit 8 calculates the second rotation speed N2 after changing the gear stage of the transmission 18 and the second target torque Tc2 corresponding to the second rotation speed N2. The second rotational speed N2 is not limited to being calculated, and may be detected by the rotational speed sensor 7. The determination unit 12 refers to the generated torque table stored in the drive power generation information storage unit 9, and determines the generated torque Tp corresponding to the second rotational speed N2 and the second target torque Tc2. The drive power generation control unit 13 outputs to the inverter 4 a control signal for setting the motor generator 2 to the operating state or the operating state and the resting state according to the operating time and the resting time.

  Next, the drive power generation control process when the transmission 18 is provided will be described with reference to FIG. This process is repeatedly executed every predetermined time when the ignition key is in the ON state.

  When this process is started, the drive power generation control unit 13 of the drive power generation control unit 8 sets the motor generator 2 to the drive state or the regenerative state (step S1).

  Next, the calculation unit 11 of the drive power generation control unit 8 uses the accelerator pedal operation amount A, the brake pedal operation amount B, and the rotational speed N of the motor generator 2 as a target torque required for running or braking of the vehicle. Tc is calculated (step S2).

  Next, the transmission control unit 22 of the transmission control unit 20 refers to the gear stage table stored in the transmission information storage unit 21 and selects a gear stage corresponding to the rotational speed N of the motor generator 2 and the target torque Tc. Then, a control signal for changing the gear stage of the transmission 18 to the selected gear stage is output to the actuator 19. Thereby, the transmission 18 is changed to a gear stage corresponding to the rotational speed N of the motor generator 2 and the target torque Tc (step S3).

  Next, the calculation unit 11 of the drive power generation control unit 8 calculates the second rotation speed N2 after changing the gear stage of the transmission 18 and the second target torque Tc2 with respect to the second rotation speed N2 ( Step S4).

  Next, the determination unit 12 of the drive power generation control unit 8 refers to the generated torque table stored in the drive power generation information storage unit 9 and generates corresponding to the second rotational speed N2 and the second target torque Tc2. Torque Tp is determined (step S5).

  Next, the drive power generation control unit 13 of the drive power generation control unit 8 puts the motor generator 2 into the operating state or the operating state and the resting state according to the operating time and the resting time according to the generated torque Tp and the second target torque Tc2. A control signal to be set is output to the inverter 4 (step S6). Accordingly, the motor generator 2 is operated continuously or intermittently, and the second target torque Tc2 is supplied to the propeller shaft 14 to drive or brake the drive wheels 17.

  As described above, according to the control system 1 of the present embodiment, the rotation speed N can be freely changed by changing the gear stage of the transmission 18, so that the motor generator 2 can operate in a highly efficient operating region or the relevant operation. The frequency of operation in the vicinity of the region is higher than when the transmission 18 is not provided, and the efficiency can be further improved.

  In addition, the said embodiment is an example of this invention and can be changed in the range which does not deviate from this invention.

  For example, in the above embodiment, the motor generator 2 is selectively set to a state of continuous operation and a state of intermittent operation according to the rotational speed N and the target torque Tc. Regardless of the target torque Tc, it may be set to a state in which it always operates intermittently.

  The control executed by the drive power generation control unit 8 is not limited to the control of the motor generator mounted on the vehicle, but can be applied to the control of the motor generator mounted on various industrial equipment.

  Further, the control executed by the drive power generation control unit 8 is not limited to the control of the motor generator that functions as both the motor and the generator, but the system having only the motor, the system having only the generator, and the motor and the generator are separated. The present invention can be applied to control of a motor and a generator in the system.

  The present invention is widely applicable to motors and generators, vehicles equipped with motor generators, railways, elevators, industrial equipment, and the like.

1: Drive power generation control system (motor control system, generator control system, motor generator control system)
2: Motor generator 3: Battery 4: Inverter 5: Acceleration sensor 6: Brake sensor 7: Revolution sensor 8: Drive power generation control unit 9: Drive power generation information storage unit (storage means)
10: CPU (Central Processing Unit) (motor control means, generator control means, motor generator control means)
DESCRIPTION OF SYMBOLS 11: Calculation part 12: Determination part 13: Drive power generation control part 14: Propeller shaft 15: Differential gear 16: Axle shaft 17: Drive wheel 18: Transmission 19: Actuator 20: Transmission control unit 21: Transmission information storage part (2nd Storage means)
22: Transmission control unit (transmission control means)

Claims (12)

An electric motor coupled to the output shaft;
Electric motor control for setting the electric motor to an intermittent driving state in which an electric motor torque higher than the target driving torque is intermittently generated so that a predetermined target driving torque is supplied to the output shaft while the rotation of the output shaft is continued. And a motor control system. The electric motor control system according to claim 1,
The motor control unit is configured to switch the electric motor between a continuous drive state in which the target drive torque is continuously generated and the intermittent drive state. The electric motor control system according to claim 2,
A storage means for storing drive torque information indicating a correspondence relationship between the rotation speed of the electric motor and the target drive torque and the drive torque;
The electric motor control means determines a driving torque corresponding to the rotational speed of the electric motor and the target driving torque when driving the output shaft, using the driving torque information stored in the storage means. If the drive torque and the target drive torque are the same, the motor is set to the continuous drive state, and if the drive torque is higher than the target drive torque, the motor is set to the intermittent drive state. Then, the drive torque is intermittently generated as the motor torque. The motor control system according to claim 3,
A transmission coupled to the electric motor and the output shaft;
Second storage means for presetting and storing gear ratio information indicating a gear ratio of the transmission corresponding to the rotational speed of the electric motor and the target drive torque;
Using the speed ratio information stored in the second storage means, a speed ratio corresponding to the rotation speed of the motor and the target drive torque when driving the output shaft is determined, and the speed change is determined. Transmission control means for changing to the changed gear ratio,
The motor control system determines the drive torque using the rotation speed of the motor and the target drive torque after the gear ratio of the transmission is changed. The electric motor control system according to any one of claims 1 to 4,
The motor control means repeatedly sets a drive rotation state in which the motor is driven with the motor torque in the intermittent drive state and a non-drive rotation state in which the motor is not driven at a predetermined cycle,
The electric motor control system, wherein a time ratio occupied by the drive rotation state in the predetermined cycle is set based on a ratio of the target drive torque to the electric motor torque. A generator coupled to the input shaft;
Intermittent power generation in which the generator generates power by intermittently generating a generator resistance torque stronger than the target braking torque so as to supply a predetermined target braking torque to the input shaft while continuing to rotate the input shaft And a generator control means for setting the state. A generator control system comprising: The generator control system according to claim 6,
The generator control unit is configured to switch the generator to a continuous power generation state in which the target braking torque is continuously generated to generate power and the intermittent power generation state. The generator control system according to claim 7,
A storage means for storing in advance braking torque information indicating a correspondence relationship between the rotational speed of the generator and the target braking torque and the braking torque,
The generator control means uses the braking torque information stored in the storage means to perform braking corresponding to the rotational speed of the generator and the target braking torque when generating power by being driven by the input shaft. If the determined braking torque and the target braking torque are the same, the generator is set to the continuous power generation state, and if the braking torque is stronger than the target braking torque, the power generation The generator is set to the intermittent power generation state, and the braking torque is intermittently generated as the generator resistance torque. The generator control system according to claim 8,
A transmission coupled to the generator and the input shaft;
Second storage means in which speed ratio information indicating a speed ratio of the transmission corresponding to the rotational speed of the generator and the target braking torque is preset and stored;
Using the gear ratio information stored in the second storage means, determining the gear ratio corresponding to the rotational speed of the generator and the target braking torque when generating power by following the input shaft, Transmission control means for changing the transmission to the determined gear ratio, and
The generator control unit determines the braking torque using the rotation speed of the generator and the target braking torque after the transmission gear ratio is changed. A generator control system according to any one of claims 6 to 9,
The generator control means repeats a braking rotation state in which the generator resistance torque is generated by the generator in the intermittent power generation state to generate power and a non-braking rotation state in which the generator does not generate power at a predetermined cycle. Set
The generator control system characterized in that the time ratio occupied by the braking rotation state in the predetermined cycle is set based on the ratio of the target braking torque to the generator resistance torque. A motor generator connected to the input / output shaft and settable to a driving state for driving the input / output shaft and a power generation state for generating power by rotating following the input / output shaft;
When driving the input / output shaft, the motor generator is set to the drive state, and the target is set so as to supply a predetermined target drive torque to the input / output shaft while continuing to rotate the input / output shaft. When the motor generator is set to an intermittent drive state that intermittently generates a motor generator torque that is higher than the drive torque and is driven to generate power by being driven by the input / output shaft, the motor generator is set to the power generation state, and The intermittent generator state is set to generate power by intermittently generating a motor generator resistance torque stronger than the target braking torque so that a predetermined target braking torque is supplied to the input / output shaft while the output shaft continues to rotate. A motor generator control system comprising: a motor generator control means. The motor generator control system according to claim 12,
When the motor generator is set in the driving state, the motor generator control means switches between a continuous driving state for continuously generating the target driving torque and the intermittent driving state, and When the power generation state is set, the motor generator control system is configured to switch between the continuous power generation state in which the target braking torque is continuously generated to generate power and the intermittent power generation state.

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