JP4399838B2 - Operation control device for power supply device - Google Patents

Description

  The present invention relates to an operation control device for a power supply device for a hybrid construction machine including an electric motor that assists driving of an engine.

  2. Description of the Related Art Conventionally, an assist motor for assisting driving of an engine, a motor for turning or traveling (hereinafter referred to as a motor for turning) and a power storage means are provided, and electric power is supplied from the assist motor and the power storage means. A hybrid construction machine that drives an electric motor for turning is proposed (for example, see Patent Document 1). In this construction machine, the electric power for driving the electric motor for turning and the like is mainly generated by the assist electric motor, and the electric power supplied from the power storage means is used in combination as necessary.

In addition to Patent Document 1, there has been proposed a construction machine that supplies electric power for driving a motor for turning or the like from an electric storage means (see, for example, Patent Document 2).
JP 2001-016704 A JP-A-10-103112

  However, in the construction machine described in Patent Document 1, when the electric motor for turning or the like is driven in a state where the charge amount of the power storage means configured by a capacitor or the like is close to the rated capacity, the electric motor for turning or the like is used for power running operation In some cases, electric power is generated by an assisting motor. At this time, since the charge amount of the power storage means is close to the rated capacity, there is a case where the chargeable capacity is not sufficiently secured in the power storage means when the electric motor for turning or the like enters the regenerative operation.

  In order to avoid this, a method of consuming electric power by causing the assisting motor to be powered by the regenerative electric power of the electric motor for turning or the like can be considered.

  However, this method does not effectively recover the regenerative power, and furthermore, the engine that receives the assist is controlled to reduce the engine torque, so that it is operated in a region where the fuel consumption rate is high. As a result, the operating efficiency of the engine is deteriorated.

  In the construction machine described in Patent Document 2, power is supplied to the electric motor for turning from the power storage means, but the electric power generated by the assist motor is also supplied to the electric motor for turning through the electric storage means. Therefore, the same problem as in Patent Document 1 may occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an operation control device for a power supply device for a hybrid construction machine that can effectively recover regenerative power and has improved engine operation efficiency.

  An operation control device for a power supply apparatus according to one aspect of the present invention is connected to an engine that supplies power to a predetermined load, and performs a power running operation for assisting driving of the engine and a regenerative operation by driving the engine. Possible assisting motor, electric motor connected to a predetermined work element and performing power running operation and regenerative operation, and supplying electric power necessary for the power running operation of the assist motor and the motor, and electric power obtained by the regenerative operation An operation control unit for controlling operation so that the assisting motor does not generate power by regenerative operation during powering operation of the motor.

  Further, the operation control means may perform operation control so that the assist motor is not caused to generate power by regenerative operation by using a zero command for setting the output of the assist motor to zero.

  The assist motor further includes torque detection means for detecting the output torque of the assist motor, and the operation control means is configured to output the assist motor according to a torque command for controlling the output torque based on a detection result of the torque detection means. In order to prevent the assist motor from generating power by regenerative operation during the power running operation of the motor, the assist motor is controlled by a torque command for setting the output torque to zero. Operation control may be performed.

  Further, the apparatus further comprises a rotation speed detection means for detecting the rotation speed of the assisting motor and a current detection means for detecting a current value of the assist motor, wherein the operation control means includes the current detection means and the rotation speed. A torque current value is calculated using the detection result of the detection means, and the operation of the assist motor is controlled by a torque current command for controlling the calculated torque current value. In order to prevent the assist motor from generating power during regenerative operation during operation, the assist motor may be controlled by a torque current command for setting the torque current value to zero.

  Moreover, when performing the regenerative operation of the said motor after the power running operation of the said motor, you may further provide the charge control means which makes the said electrical storage means charge the electric power obtained by the regenerative operation of the said motor.

  The operation control means calculates, as a control command for the assisting motor, a first command for causing the engine output to follow a target value, and a second command for setting the power storage amount of the power storage means to a predetermined amount, The larger one of the first command and the second command may be selected as the driving command for the assisting motor.

  According to the present invention, it is possible to provide a specific effect that it is possible to provide an operation control device for a power supply device for a hybrid construction machine that can effectively recover regenerative power and improve engine operation efficiency.

  Hereinafter, an embodiment to which an operation control device of a power supply device of the present invention is applied will be described.

  FIG. 1 is a diagram schematically showing a configuration of a hybrid construction machine including an operation control device for a power supply device according to the present embodiment. The construction machine includes an engine 1, an assisting electric motor 2, a battery 3, an electric motor 4, a turning unit 5, a hydraulic pump 6, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9.

  The engine 1, the assisting electric motor 2, and the hydraulic pump 6 are mechanically connected by a reduction gear 10 having a predetermined configuration. Further, the assist motor 2, the battery 3, and the motor 4 are connected by a DC bus 11, and the DC bus 11 is provided with a step-up / down converter 12 and inverters 13A and 13B. A control valve 14 for controlling the hydraulic pressure supplied to the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9 is disposed downstream of the hydraulic pump 6.

  The engine 1 is composed of, for example, a diesel engine. The engine 1 is always operated during the operation of the construction machine.

  The assisting electric motor 2 assists driving of the engine 1 and generates electric power when driven by the engine 1. That is, power running operation and regenerative operation are possible. The assisting electric motor 2 is constituted by, for example, an IPM (Interior Permanent Magnet) motor.

  The battery 3 is used as a power storage unit and may be a secondary battery or a capacitor.

  The electric motor 4 is arranged to rotationally drive a turning shaft (not shown) of the turning unit 5. The electric motor 4 only needs to be able to perform a power running operation and a regenerative operation at the time of rotational driving, and is configured by an IPM motor, for example. The turning unit 5 turns when the operator of the construction machine operates the electric motor 4.

  The swivel unit 5 is supported by a horizontal rotation shaft (not shown) and is rotatably attached to a chassis (not shown) by the electric motor 4. A driver's seat, an arm, a boom, a bucket, and the like (not shown) are mounted on the turning unit 5.

  The hydraulic pump 6 converts the output of the engine 1 into hydraulic pressure. By controlling this hydraulic pressure with the control valve 14, the boom cylinder 7, the arm cylinder 8 and the bucket cylinder 9 are controlled, and the arm, boom and bucket (not shown) are driven.

  The step-up / down converter 12 includes elements such as a reactor, a step-up IGBT (Insulated Gate Bipolar Transistor), and a step-down IGBT, and is a converter for controlling charging / discharging of the battery 3. In this embodiment, since it is used for a hybrid construction machine, for example, a medium-sized construction machine has a rated output of about 20 kW, an instantaneous maximum output power of ± 80 kW, a rated current of ± 100 A, and an instantaneous maximum current of about ± 400 A. It becomes. For this reason, each element included in the buck-boost converter 12 is required to be able to withstand such an application.

  The inverter 13 </ b> A performs DC / AC conversion between the DC bus 11 and the assisting motor 2. Similarly, the inverter 13 </ b> B performs DC / AC conversion between the DC bus 11 and the electric motor 4.

  In FIG. 1, the operation control units of the engine 1 and the assisting motor 2 are omitted. Similarly, a control unit for driving the boosting IGBT and the step-down IGBT of the step-up / down converter 12 by PWM (Pulse Width Modulation) is also omitted. These control units can be realized by either an electronic circuit or an arithmetic processing unit. The control unit of the buck-boost converter 12 controls the voltage value of the DC bus 11 to a desired value by switching between voltage control and current control according to the voltage value of the DC bus 11 and the current value flowing through the buck-boost converter 12. Charge / discharge control is performed accordingly.

  As described above, the electric motor 4 is driven by the operation of the driver of the construction machine.

  FIG. 2 is a block diagram illustrating a control unit of the assisting motor in the operation control apparatus of the power supply apparatus according to the present embodiment. An output command for driving the assisting electric motor 2 is calculated by this control unit.

  As shown in FIG. 2, the control unit of the assisting electric motor 2 includes a target engine output calculation unit 21, a hydraulic load output calculation unit 22, a battery request output calculation unit 23, an electric load output calculation unit 24, and a power / power efficiency conversion unit. 25, a maximum value selection output unit (max) 26, an output command control unit 27, a control / power efficiency conversion unit 28, and a torque command calculation unit 29.

  Based on the target engine output Eref (k) calculated by the target engine output calculation unit 21 and the oil load output Href (k) calculated by the hydraulic load output calculation unit 22, the control unit of the assisting electric motor 2 The power / power efficiency conversion unit 25 calculates the first output command Aref1 (k) by the following equation (1).

Aref1 (k) = (Href (k)-Eref (k)) x ηme (1)
Here, the efficiency coefficient ηme is an efficiency coefficient when the power of the assisting motor 2 is converted into electric power.

  The first output command Aref1 (k) is calculated as a command for assisting the assist motor 2 to drive the engine 1 when the hydraulic load output is larger than the target engine output. When the hydraulic load output is smaller than the engine output to be calculated, it is calculated as a command for causing the assisting electric motor 2 to generate power (regeneration) based on the surplus engine output. In the present embodiment, the first output command for assist (power running) is a positive value, and the first output command for power generation (regeneration) is a negative value.

  The reason why the efficiency coefficient ηme is multiplied in the equation (1) is to perform comparison in the same dimension as a second output command Aref2 (k) described later.

  In addition, the control unit of the assisting electric motor 2 includes a battery request output Bref (k) calculated by the battery request output calculation unit 23 and an electric load output calculation unit in parallel with the calculation of the first output command Aref1 (k). Based on the electrical load output Dref (k) calculated in 24, the second output command Aref2 (k) is calculated by the following equation (2).

Aref2 (k) = Bref (k) -Dref (k) (2)
Here, the battery required output Bref (k) is an output necessary for charging the current value of the battery charge rate (SOC: State Of Charge) to a desired charge rate. Here, the battery charge rate (SOC) is a ratio represented by the following equation (3).

Battery charge rate = current battery charge / battery capacity rating (3)
The second output command Aref2 (k) represents a command for causing the assisting motor 2 to generate the output for the electrical load output and the charge rate return. Here, the electric load output means the output that the assisting motor 2 needs to output in order to generate the output necessary for the electric load (the electric motor 4), and the charge rate recovery amount means the battery charge rate. This is the output that the assisting motor 2 needs to output in order to return (SOC) to a desired charging rate. In the present embodiment, the second output command for discharging is a positive value, and the second output command for charging is a negative value.

  The maximum value selection output unit (max) 26 outputs the larger one of the first output command Aref1 (k) and the second output command Aref2 (k) and sends it to the output command control unit 27.

  Here, the reason for selecting the output command having the larger value in the maximum value selection output unit (max) 26 is as follows.

  When the electric motor 4 does not perform the regenerative operation, the second output command Aref2 (k) of the assisting electric motor 2 takes a substantially negative value. Although this will be described in detail later, in the power supply device of the present embodiment, since the charging rate of the battery 3 rarely exceeds the target charging rate, the battery request output is almost always the power generation command (negative Output). Further, since the target engine output and the hydraulic load output are always positive outputs, the first output command Aref1 (k) of the assisting motor 2 is an assist command (positive output when the hydraulic load output is larger than the target engine output. When the hydraulic load output is smaller than the target engine output, the power generation command (negative output) is obtained. Therefore, when the hydraulic load output is larger than the target engine output, it is preferable to select Aref1 (k) as the final output command Aref (k) of the assisting motor 2.

  Further, when the hydraulic load output is smaller than the target engine output, it is preferable to select the final output command Aref (k) of the assisting electric motor 2 with the smaller power generation amount. This is to prevent the output of the engine 1 from being increased (that is, the fuel efficiency is deteriorated) in order to increase the power generation amount. Since the output command for power generation is negative, the smaller power generation amount means selecting the larger value as a real number.

  When the electric motor 4 performs a regenerative operation, the polarity of the second output command Aref2 (k) changes depending on the relationship between the battery request output and the electric load output. When the second output command Aref2 (k) is a power generation command (negative output), it is preferable to select the smaller power generation amount as in the case described above. On the other hand, when the second output command Aref2 (k) is an assist command (positive output) and the hydraulic load output is larger than the target engine output, the first output command Aref1 (k) or the second output command Aref2 ( Select the larger of k). On the other hand, when the hydraulic load output is smaller than the target engine output, the second output command Aref2 (k) is selected.

  From the above, the maximum value selection output unit (max) 26 selects the output command having the larger value of the first output command Aref1 (k) or the second output command Aref2 (k).

  Thus, when the hydraulic load (hydraulic pump 6) is driven, the first output command Aref1 (k) is selected and controlled to a desired engine output. On the other hand, when the hydraulic load is hardly driven, the second output is output. The battery charge rate is controlled with priority given to the command Aref2 (k).

  The output command control unit 27 limits the output command to the assisting motor 2 according to the operating state of the motor 4. A specific calculation method will be described later with reference to FIG.

  The control / power efficiency conversion unit 28 multiplies the output command of the assist motor 2 output from the output command control unit 27 by the control efficiency ηec, thereby obtaining a final output command Aref (k ) Is calculated. Here, the efficiency ηec is a coefficient in consideration of a loss when converting a control command to the inverter 13A into electric power.

  The torque command calculation unit 29 calculates a torque command based on the output command Aref (k) transmitted from the control / power efficiency conversion unit 28 and the rotation speed of the assisting motor 2. This torque command is calculated by dividing the output command Aref (k) by the number of revolutions, and the torque command is transmitted to the assisting motor 2 for operation control. The rotational speed of the assisting motor 2 is detected by a predetermined sensor (not shown).

  FIG. 3 is a diagram showing a procedure for limiting the output command to the assisting motor 2 in accordance with the drive state of the motor 4 in the output command control unit 27 of the operation control device of the power supply device of the present embodiment.

  The output command control unit 27 determines whether the operation state of the electric motor 4 is a power running operation or a regenerative operation (step S1). When the electric motor 4 is in a regenerative operation state, the process is terminated without performing any particular process. Upon completion of this process, the first output command Aref1 (k) or the second output command Aref2 (k) transmitted from the maximum value selection output unit (max) 26 is transmitted to the control / power efficiency conversion unit 28 as it is.

  When the output command control unit 27 determines that the motor 4 is in a power running operation, the output command control unit 27 determines whether the assist motor 2 is in an assist state (power running operation) or a power generation state (regenerative operation) ( Step S2). In the power supply device of the present embodiment, when the motor 4 is in a power running operation, operation control is performed so that the assist motor 2 does not generate power. Therefore, in the determination process in step S2, the assist motor 2 is It is determined whether or not it is going to shift to the power generation state (regenerative operation).

  When the output command control unit 27 determines that the assisting electric motor 2 is in the assist state, the output command control unit 27 ends the process without performing any particular process. Upon completion of this process, the first output command Aref1 (k) or the second output command Aref2 (k) transmitted from the maximum value selection output unit (max) 26 is transmitted to the control / power efficiency conversion unit 28 as it is.

  If the output command control unit 27 determines that the assisting motor 2 is about to enter the power generation state (regenerative operation), the output command control unit 27 sets the output command transmitted to the assisting motor 2 to zero (step S3). As a result, the output command transmitted from the output command control unit 27 to the control / power efficiency conversion unit 28 becomes zero, and the torque command calculated by the torque command calculation unit 29 also becomes zero. As a result, the assisting motor 2 is controlled so as not to generate power.

  As described above, the power supply device according to the present embodiment is configured so that the assist motor 2 output command Aref1 (k) derived by comparing the target engine output and the hydraulic load output and the charging rate to a desired value. Of the necessary assist motor 2 output command Aref2 (k), when the motor 4 is in a power running operation using a control algorithm that uses the command with the larger value as the output command of the assist motor 2. Operation control is performed by using only the battery 3 as a power supply source to the motor 4 (the assisting motor 2 is not allowed to generate power).

  FIG. 4 is a diagram conceptually showing a flow of electric power in the hybrid construction machine to which the operation control device of the power supply device of the present embodiment is applied.

  An operation for prohibiting power generation by the assisting motor 2 when the motor 4 is in a power running state will be described. The arrows in the figure indicate the flow of power.

  When the electric motor 4 is driven by the operation of the construction machine driver, the electric motor 4 is first powered-run, and the electric power supplied through the DC bus 11 is converted into power in the electric motor 4.

  As the electric power is consumed by the electric motor 4, the voltage of the DC bus 11 decreases. On the other hand, the battery 3 monitors the voltage of the DC bus 11 and tries to keep it at a constant voltage. For this reason, the battery 3 releases power to the DC bus 11.

  At this time, since the assisting motor 2 is controlled so as not to generate power, all the power supplied to the motor is supplied from the battery 3 (see FIG. 4A).

  Further, when braking the rotation of the electric motor 4 by the operation of the driver of the construction machine, the electric motor 4 performs a regenerative operation, converts the power into electric power, and returns it to the DC bus 11. For this reason, the voltage of the DC bus 11 rises. At this time, since the battery 3 monitors the voltage of the DC bus 11 and tries to keep it at a constant voltage, the battery 3 is charged.

  At this time, the charging rate of the battery 3 is reduced by the discharge during the power running operation of the electric motor 4 shown in FIG. 4A, and the battery 3 has a sufficient capacity to charge regenerative power. The regenerative power output from the electric motor 4 is charged in the battery 3.

  Here, due to the power / power conversion efficiency, the electric power charged by the battery 3 by the regenerative operation of the electric motor 4 is smaller than the electric power supplied (released) by the electric motor 4 for the electric motor 4 to perform the power running operation. The charging rate of the battery 3 is lower than the state before the electric motor 4 performs the power running operation. This reduction in the charging rate may be compensated by the assisting motor 2 generating power, except when the above-described assisting motor 2 is not allowed to generate power.

  FIG. 5 is a diagram showing a simulation result of the hydraulic pump output and the electric load output in the hybrid construction machine to which the operation control device of the power supply device of the present embodiment is applied.

  FIG. 6 shows the engine output, the output of the assisting motor, and the charging rate of the hybrid construction machine to which the operation control device of the power supply device of the present embodiment is applied and the conventional hybrid construction machine. FIG. The characteristics shown in FIGS. 6A to 6C are characteristics when the power supply apparatus is operated with the hydraulic load output characteristics and the electrical load output characteristics shown in FIG. Here, the characteristic of the conventional hybrid construction machine is represented by a broken line, and the characteristic of the hybrid construction machine to which the power supply device of the present embodiment is applied is represented by a solid line.

  Hereinafter, a simulation result that verifies that the regenerative electric power of the motor 4 can be recovered without waste and the engine 1 can be operated efficiently by prohibiting the power generation of the assisting motor 2 when the motor 4 is in a power running operation state. explain.

  When power is supplied from a battery (power storage means) and an assisting motor to a motor (for turning, etc.) as in a conventional hybrid construction machine (for example, one described in Patent Document 1) (for turning, etc.) Since the electric power necessary for the power running operation of the motor is generated by the assisting motor, the charging rate hardly decreases while the motor (for turning, etc.) is performing the power running operation (see FIG. 6C). .

  As a result, when the motor performs a regenerative operation following the power running operation, the regenerative power cannot be fully charged in the battery (power storage means), so the assisting motor performs the power running operation (engine assist) to consume the surplus. become. For this reason, the engine output decreases to substantially zero (see the region of 12 to 13 seconds in FIG. 6A and the region of 16 to 18 seconds in FIG. 6).

  In general, since the fuel consumption rate is low in a region where the engine output is low (region where the engine torque is low), the engine output characteristics shown in FIG. 6A indicate that the vehicle is operating in a region where fuel efficiency is not good.

  On the other hand, when the electric motor 4 is in a powering operation state as in the power supply device of the present embodiment, if the power generation of the assisting motor 2 is prohibited, the assisting motor 2 is operated during the powering operation of the electric motor 4. Then, since no power is generated and the electric power necessary for the power running operation of the electric motor 4 is supplied from the battery 3, the charging rate of the battery 3 during the power running operation of the electric motor 4 decreases (8 to 13 seconds in FIG. 6C). And see the 15-17 second region).

  Then, during the regenerative operation of the motor 4 after prohibiting the power generation of the assisting motor 2 in this way, the amount of charge of the battery 3 has a margin corresponding to the decrease in the charging rate, so the regenerative power of the motor 4 is transferred to the battery 3. The battery is charged and the shortage is generated by the assisting motor 2.

  Thus, the assisting motor 2 assists the engine 1 during the regenerative operation of the motor 4 in order to limit the regenerative operation of the assisting motor 2 during the power running operation of the motor 4 so that the regenerative power of the motor 4 can be efficiently collected. This can be suppressed, and as a result, the output characteristics of the engine 1 can be suppressed from decreasing to a region where the fuel efficiency is not good (see FIG. 6A).

  In particular, when the electric motor 4 is used for driving the revolving unit 5, the regenerative operation is always performed after the power running operation. Therefore, as described above, only a simple correction method is applied to the control command of the assisting motor 2. The operating efficiency of the engine 1 can be improved.

  In FIG. 6B, when the output characteristic result of the assisting motor 2 is compared with that of the conventional construction machine, the power supply device of the present embodiment is more energy efficient than the conventional construction machine. The balance is small. As a result, the effective current can be kept low, and the heat generation amount of the assisting motor 2 that easily generates heat can be reduced.

  Further, when the charging rates of the conventional machine shown in FIG. 6C and the construction machine of the present embodiment are compared with each other, the conventional construction machine maintains a high charging rate before the motor enters the regenerative operation. The target charge amount may be exceeded during regenerative operation, but the power supply device according to the present embodiment does not exceed the target charge amount.

  Therefore, it is possible to set the target value of the charging rate higher than that of the conventional construction machine.

  As described above, according to the operation control device of the power supply device of the present embodiment, the following effects can be obtained.

  By efficiently using the regenerative operation after the motor 4 is in the power running operation, it is possible to increase the chargeable amount of the battery 3 during the power running operation before the regenerative operation of the motor 4, and the regenerative power of the motor 4 can be reduced. It can be collected without waste.

  Thereby, overcharge of the battery 3 can be suppressed, and a power supply device for a hybrid construction machine that can effectively and effectively use the regenerative operation of the electric motor 4 to perform braking safely and reliably can be provided.

  Since the capacity for charging the regenerative electric power of the electric motor 4 can be secured in the battery 3, the assist electric motor 2 can be prevented from assisting the engine 1 by the regenerative electric power of the turning electric motor 4, and the output of the engine 1 is reduced. Therefore, it is possible to suppress the operation of the engine 1 in a region where the fuel consumption rate is bad.

  Also, by providing unnecessary assist to the engine 1 in this way, it is possible to provide a power supply device for a hybrid construction machine that can effectively and safely use the regenerative operation of the electric motor 4 to perform braking safely and reliably. Can do.

  By making the energy balance of the battery 3 larger than before, the energy balance of the assisting motor 2 can be reduced, so that the amount of heat generated by the assisting motor 2 can be reduced.

  Since the charging rate of the battery 3 during normal operation (when power generation by the assisting motor 2 is prohibited during powering operation of the motor 4) can be maintained higher than before, the battery after discharging power from the battery 3 The remaining power of 3 increases. Thereby, the margin of the electric power in the battery 3 can be kept large, the amount of current when charging / discharging can be suppressed low, and the amount of heat generated by the battery 3 can be suppressed.

  In the above, the first output command for assist (power running) is a positive value, the first output command for power generation (regeneration) is a negative value, and the second output command for discharge is a positive value, The second output command for charging is set to a negative value, and the maximum value selection output unit (max) 26 outputs the larger one of the first output command Aref1 (k) and the second output command Aref2 (k). However, the polarity of the command value may be reversed between positive and negative. In this case, the maximum value selection output unit (max) 26 may output the smaller command.

  In the above description, the operation control of the assisting motor 2 is performed based on the torque command. However, when the operation control device of the assisting motor 2 is current-controlled, the torque current command for current control is set to zero. You may comprise. In this case, a rotation speed detection means for detecting the rotation speed of the assist motor and a current detection means for detecting the current value of the assist motor are provided, and the operation control device detects the detection results of the torque detection means and the rotation speed detection means. Is used to control the operation of the assisting motor 2 in accordance with a torque current command for controlling the calculated torque current value. During the power running operation of the motor 4, the assisting motor In order to prevent the power generation due to the regenerative operation in FIG. 2, the operation of the assisting motor 2 may be controlled by a torque current command for setting the torque current value to zero.

  In the above description, the power supply device including the electric motor 4 that rotates the turning unit 5 as a work element to be electrified in the hybrid construction machine has been described. However, the work element to be electrified is not limited thereto. If the electric motor can perform a power running operation and a regenerative operation as the work element is driven, the permanent track, the arm, and other work elements may be driven by the electric motor.

  As described above, the operation control device of the power supply device according to the exemplary embodiment of the present embodiment has been described. However, the present embodiment is not limited to the specifically disclosed embodiment, and is a patent. Various modifications and changes can be made without departing from the scope of the claims.

It is a figure which shows schematically the structure of the operation control apparatus of the power supply device of this Embodiment. It is a block diagram which shows the control part of the electric motor for assistance in the operation control apparatus of the power supply device of this Embodiment. It is a figure which shows the procedure which restrict | limits the output command to the motor for assistance according to the drive state of an electric motor in the output command control part of the operation control apparatus of the power supply device of this Embodiment. It is a figure which shows notionally the flow of the electric power in the hybrid type construction machine with which the operation control apparatus of the power supply device of this Embodiment is applied. It is a figure which shows the simulation result of the hydraulic pump output in the hybrid-type construction machine to which the operation control apparatus of the power supply device of this Embodiment is applied, and an electrical load output. It is a figure which shows the engine output of the hybrid type construction machine to which the operation control apparatus of the power supply device of this Embodiment is applied, and the conventional hybrid type construction machine, the output of the assist motor, and the charging rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Motor for assist 3 Battery 4 Electric motor 5 Turning part 6 Hydraulic pump 7 Boom cylinder 8 Arm cylinder 9 Bucket cylinder 10 Reducer 11 DC bus 12 Buck-boost converter 13A, 13B Inverter 14 Control valve 21 Target engine output calculating part 22 Hydraulic pressure Load output calculation unit 23 Battery demand output calculation unit 24 Electric load output calculation unit 25 Power / power efficiency conversion unit 26 Maximum value selection output unit (max)
27 Output Command Control Unit 28 Control / Power Efficiency Conversion Unit 29 Torque Command Calculation Unit

Claims (6)

Connected to an engine that supplies power to a predetermined load, and connected to a powering operation for assisting driving of the engine, and an assisting motor capable of regenerative operation by driving the engine, and a predetermined work element; An operation control device for a power supply device, comprising: an electric motor that performs a power running operation and a regenerative operation; and an electric storage unit that supplies electric power necessary for the power running operation of the assist motor and the electric motor and charges electric power obtained by the regenerative operation Because
An operation control device for a power supply device, comprising operation control means for performing operation control so that the assisting motor does not generate power during regenerative operation during power running operation of the motor.   2. The power supply according to claim 1, wherein the operation control unit performs operation control so that the assist motor does not generate power by regenerative operation by using a zero command for setting the output of the assist motor to zero. 3. Operation control device of the device. A torque detecting means for detecting an output torque of the assisting motor;
The operation control unit is configured to perform operation control of the assisting motor based on a torque command for controlling the output torque based on a detection result of the torque detection unit, and during powering operation of the motor, The operation control device of the power supply device according to claim 1, wherein operation control of the assist motor is performed by a torque command for setting the output torque to zero so that the assist motor is not generated by regenerative operation. Rotational speed detection means for detecting the rotational speed of the assisting motor; and current detection means for detecting the current value of the assisting motor;
The operation control means calculates a torque current value using the detection results of the current detection means and the rotation speed detection means, and operates the assist motor according to a torque current command for controlling the calculated torque current value. The assist motor is configured to perform a control according to a torque current command for setting the torque current value to zero in order to prevent the assist motor from generating power by regenerative operation during the power running operation of the motor. The operation control device for a power supply device according to claim 1, wherein operation control is performed.   5. The apparatus according to claim 2, further comprising a charge control unit configured to charge the power storage unit with electric power obtained by the regenerative operation of the electric motor when performing the regenerative operation of the electric motor after the power running operation of the electric motor. An operation control device for the power supply device according to 1.   The operation control means calculates, as a control command for the assisting motor, a first command for causing the engine output to follow a target value, and a second command for setting the power storage amount of the power storage means to a predetermined amount, The operation control device for a power supply device according to any one of claims 1 to 5, wherein a larger one of the first command and the second command is selected as a drive command for the assisting motor.

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