JP6285246B2 - Mixer vehicle, control device, and rotation control method of mixer drum - Google Patents

Description

  The present invention relates to a mixer vehicle having an idling stop function for stopping an engine when the vehicle is stopped, a control device mounted on the mixer vehicle, and a rotation control method of the mixer drum.

  For the purpose of reducing noise or improving fuel consumption, an idling stop function of a vehicle that stops an engine when the vehicle is stopped such as waiting for a signal is known. Currently, the idling stop function is mainly installed in ordinary vehicles such as passenger cars, but in recent years, an idling stop system for special vehicles such as construction vehicles has been developed.

  For example, a mixer truck that transports ready-mixed concrete to a construction site must always rotate the mixer drum until the ready-mixed concrete is discharged, and the engine of the mixer truck is generally used as the drive source. Specifically, the rotational power of the engine is transmitted to the hydraulic pump, the pressure oil discharged from the hydraulic pump is supplied to the hydraulic motor to drive it, and the mixer drum is driven to rotate by the rotation of the hydraulic motor. . For this reason, conventional mixer trucks are environmentally friendly, such as engine noise when the construction site is in the vicinity of a residential area, exhaust gas during tunnel construction, exhaust gas and noise during idling due to traffic lights and traffic jams, etc. The problem was pointed out.

  Therefore, in recent years, a mixer vehicle that can rotate the drum even when the engine is stopped has been proposed. For example, Patent Document 1 discloses a power generation device driven by an engine, a power storage device that stores the output of the power generation device, an electric motor that is driven by electric power stored in the power storage device, and a second that is driven by the output of the electric motor. And a control device for controlling the drum to rotate by driving the hydraulic motor with the electric motor and the second hydraulic pump when the engine is stopped is disclosed.

Japanese Patent Laid-Open No. 2003-301802

  Generally, a secondary battery used for a power storage device has a characteristic that discharge characteristics change according to a state of charge (SOC). Therefore, when a secondary battery such as a lithium ion battery having a high energy density and a high voltage is used as a rotational power source of the mixer drum when the engine is stopped, the mixer drum rotates at an unnecessarily high rotational speed when the charge amount is high. In some cases, useless energy is consumed.

  In view of the circumstances as described above, it is an object of the present invention to provide a mixer vehicle, a control device, and a mixer drum rotation control method capable of realizing energy saving of the rotational power of the mixer drum when the engine is stopped.

In order to achieve the above object, a mixer truck according to an embodiment of the present invention includes a vehicle body, a first drive circuit, and a second drive circuit.
The vehicle body includes an engine, a generator that generates electric power using the power of the engine, a controller that controls the engine, and a mixer drum.
The first drive circuit includes a hydraulic motor that rotates the mixer drum, and a first hydraulic pump that is driven by the power of the engine and supplies liquid to the hydraulic motor.
The second drive circuit includes a storage battery that stores the output of the generator, an electric motor that is driven by the discharge of the storage battery, and a second liquid that is driven by the electric motor and supplies liquid to the hydraulic motor. A pressure pump and a discharge controller; The discharge control unit detects the charge amount of the storage battery when receiving an idling stop signal from the control unit, and when the charge amount exceeds a predetermined value, the higher the charge amount, the lower the duty ratio. The storage battery is pulse-discharged.

  The mixer vehicle rotates the mixer drum by the first drive circuit when the engine is driven, for example, while driving, and rotates the mixer drum by the second drive circuit, when the engine is idling stopped, such as when the vehicle is stopped.

  Here, in the second drive circuit, the discharge control unit detects the charge amount of the storage battery when receiving the idling stop signal, and when the charge amount exceeds a predetermined value, the higher the charge amount, the higher the charge amount. The storage battery is configured to pulse discharge at a low duty ratio. Thereby, even when the charge amount of the storage battery is large, it is not necessary to discharge the storage battery more than necessary, and energy saving of the rotational power of the mixer drum can be achieved.

  The predetermined value is not particularly limited, and is typically set to an appropriate value capable of outputting electric power necessary for rotating the mixer drum at a target rotational speed. The number of revolutions of the mixer drum at the time of idling stop is not particularly limited. For example, the number of revolutions is set to be lower than the number of revolutions of the mixer drum during traveling (when the engine is driven).

  That is, in the mixer vehicle, the predetermined value is a charge amount for outputting electric power corresponding to reference electric power for rotating the mixer drum at a predetermined rotational speed when idling is stopped. When the charge amount exceeds the predetermined value, the discharge control unit pulse-discharges the storage battery at a duty ratio that provides an output corresponding to the reference power. Thereby, it is possible to prevent the storage battery from being discharged at an output exceeding the reference power, and to realize energy saving of the rotational power of the mixer drum.

  On the other hand, when the charge amount of the storage battery is equal to or less than the predetermined value, the discharge control unit may be configured to continuously discharge the storage battery. As a result, the mixer drum can be rotated at the predetermined rotation speed or less.

  A lithium ion battery is typically used for the storage battery. However, the present invention is not limited to this, and an appropriate secondary battery having an output characteristic capable of rotating the mixer drum at a predetermined number of revolutions for a predetermined time is applicable.

A control device according to an aspect of the present invention includes a generator that generates power using engine power, a control unit that controls the engine, a hydraulic motor that rotates a mixer drum, a storage battery that stores the output of the generator, A control device mounted on a mixer car having an electric motor driven by discharge by the storage battery, and a hydraulic pump driven by the electric motor and supplying liquid to the hydraulic motor, a receiving unit, A detection unit and a controller are provided.
The receiving unit is configured to receive an idling stop signal from the control unit.
The detection unit detects a charge amount of the storage battery.
When the controller receives the idling stop signal, the controller determines whether or not the detected charge amount of the storage battery exceeds a predetermined value, and if the charge amount exceeds the predetermined value, The storage battery is pulse-discharged with a lower duty ratio as the charge amount is higher.

A mixer drum rotation control method according to an aspect of the present invention is a mixer drum rotation control in which an electric motor is driven by discharge from a storage battery and the mixer drum is rotated at a predetermined rotation speed by the output of the electric motor when the mixer vehicle is idling stopped. The method includes determining whether or not a charge amount of the storage battery exceeds a predetermined charge amount for outputting power corresponding to a reference power for rotating the mixer drum at the predetermined rotation speed. .
When the charge amount exceeds the predetermined charge amount, the storage battery is pulse-discharged at a duty ratio that provides an output corresponding to the reference power.
On the other hand, when the charge amount is equal to or less than the predetermined charge amount, the storage battery is continuously discharged.

  According to the present invention, energy saving of the rotational power of the mixer drum when the engine is stopped can be realized.

1 is a schematic side view showing a mixer truck according to an embodiment of the present invention. It is a schematic block diagram which shows the drive circuit of the mixer drum in the said mixer vehicle. It is a functional block diagram of the discharge control part mounted in the said mixer vehicle. It is a figure which shows an example of the relationship between the charge amount (SOC) of the storage battery in the 2nd drive circuit of the said mixer vehicle, and the duty ratio in the pulse discharge control. It is a figure explaining the example of the discharge control of the said storage battery. It is a flowchart explaining operation | movement of the said discharge control part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view showing a mixer truck according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram showing a mixer drum drive circuit in the mixer vehicle.

[Overall configuration of mixer truck]
The mixer truck 100 includes a mixer drum 1 that transports mortar, ready-mixed concrete or the like (hereinafter referred to as “raw concrete”) from a ready concrete factory to a construction site. The mixer drum 1 is rotatably installed on the gantry 2 of the mixer truck 100. When transporting the raw concrete, the mixer truck 100 agitates the raw concrete with a plurality of spiral blades attached to the mixer drum 1 by rotating the mixer drum 1 in the forward direction in order to prevent quality deterioration and solidification of the raw concrete. Moreover, the mixer truck 100 discharges the raw concrete in the mixer drum 1 by rotating the mixer drum 1 in the reverse direction, and supplies it to the concrete placement site.

  As shown in FIGS. 1 and 2, the mixer truck 100 has a vehicle body portion 10. The vehicle body unit 10 includes a mixer drum 1, a gantry 2, an engine 3, a generator 4, a first battery 5, a control unit 6, a cabin 7, and the like.

  The engine 3 is a power source of the mixer vehicle 100 and is configured by an internal combustion engine such as a gasoline engine or a diesel engine. The generator 4 generates power with the rotational power of the engine and supplies the generated power to the first battery 5 and a second battery 21 described later. The generator 4 is not limited to one, and a plurality of generators may be provided. In this case, the first and second batteries 5 and 21 may be charged by a plurality of generators, or a generator may be assigned to each battery.

  The first battery 5 stores the output (electric power) of the generator 4 and is used as an electric power source for the electrical system in the vehicle body unit 10. The first battery 5 is, for example, a lead storage battery with a rating of 24 V in which 12 2 V unit cells are connected in series.

  The control unit 6 is typically configured by a computer, and electrically controls electrical components of the mixer truck 100 in addition to ignition control of the engine 3.

  Moreover, the control part 6 performs the idling stop function which stops the drive of the engine 3 on predetermined conditions, when the mixer vehicle 100 stops by signal waiting etc. The predetermined condition is set as appropriate, and typically, the operation state of an accelerator pedal, a brake pedal, a side brake (parking brake), or the like is referred to. The controller 6 is configured to transmit an idling stop signal to the second drive circuit 52 when executing the idling stop function.

  In the mixer vehicle 100, it is necessary to always rotate the mixer drum 1 until the raw concrete is discharged. Therefore, the mixer vehicle 100 includes a first drive circuit 51 that operates when the engine is driven and a second drive circuit 52 that operates when the engine is stopped as a drive circuit for the mixer drum 1.

  The first drive circuit 51 uses the engine 3 of the mixer vehicle 100 as its drive source. The first drive circuit 51 transmits the rotational power of the engine 3 to the first hydraulic pump 11 (first hydraulic pump) via PTO (Power Take Off), and is discharged from the first hydraulic pump 11. The pressure oil (liquid) is supplied to the hydraulic motor 12 (hydraulic motor) and driven, and the mixer drum 1 is driven to rotate by the rotation of the hydraulic motor 12.

  The second drive circuit 52 uses the second battery 21 as its drive source. The second drive circuit 52 drives the electric motor 22 with the discharge output of the second battery 21, and transmits the rotational power of the electric motor 22 to the second hydraulic pump 23 (second hydraulic pump). The second hydraulic pump 23 supplies pressure oil to the hydraulic motor 12 to drive it, and the mixer drum 1 is driven to rotate by the rotation of the hydraulic motor 12.

[First drive circuit]
Next, details of the first drive circuit 51 will be described.

  The first drive circuit 51 includes a first hydraulic pump 11, a hydraulic motor 12, and a first control valve 13. The first control valve 13 is disposed between the first hydraulic pump 11 and the hydraulic motor 12, and a hydraulic circuit 14 is configured between the hydraulic motor 12 and the first control valve 13.

  The first hydraulic pump 11 is driven by the power of the engine 3 and supplies pressure oil to the hydraulic motor 12. The hydraulic motor 12 rotates the mixer drum 1 upon receiving pressure oil supplied from the first hydraulic pump 11.

  The first control valve 13 switches the supply of pressure oil from the first hydraulic pump 11 to the hydraulic circuit 14 and the cutoff thereof, and the supply direction of the pressure oil in the hydraulic circuit 14. The first control valve 13 is configured by a three-position four-port electromagnetic switching valve having an A position, a B position, and a C position, and each position is based on a control signal transmitted from the control unit 6. Can be switched.

  Specifically, the first control valve 13 is switched to the A position when the mixer drum 1 is rotated in the forward direction, and is switched to the C position when the mixer drum is rotated in the reverse direction. The first control valve 13 is switched to the B position when the supply of pressure oil from the first hydraulic pump 11 to the hydraulic motor 12 is shut off.

  Although not shown, the hydraulic circuit 14 may be provided with a relief valve that opens when a hydraulic pressure higher than a predetermined level is generated, a check valve that regulates the pressure oil supply direction, and the like at appropriate positions. Although not shown, a speed reducer may be installed between the hydraulic motor 12 and the mixer drum 1.

[Second drive circuit]
The second drive circuit 52 includes the second battery 21, the electric motor 22, the second hydraulic pump 23, the second control valve 24, and the discharge control unit 25.

  The second drive circuit 52 may have a single unit structure. In this case, the second drive circuit 52 is installed at an appropriate position on the gantry 2, for example, between the cabin 7 and the hydraulic motor 12 as shown in FIG. 1.

  The second battery 21 is composed of a storage battery that stores the output (electric power) of the generator 4 and is used as a power source of the electric motor 22. The second battery 21 is not particularly limited as long as it is a chargeable / dischargeable secondary battery. In the present embodiment, a lithium ion battery having a rating of 25.9 V in which seven 3.7 V unit cells are connected in series is used. It is done.

  The electric motor 22 is driven by the output of the second battery 21, and is constituted by a direct current (DC) motor, for example. As will be described later, the electric motor 22 is driven by the output of the second battery 21 whose discharge is controlled by the discharge controller 25 when the discharge controller 25 receives the idling stop signal.

  The second hydraulic pump 23 is driven by the electric motor 22. The second hydraulic pump 23 sucks the hydraulic oil stored in the tank 26 and supplies pressure oil to the hydraulic circuit 14. The amount of pressure oil discharged from the second hydraulic pump 23 is controlled by the output (rotation speed) of the electric motor 22. The second hydraulic pump 23 circulates the pressure oil in the hydraulic circuit 14 in the direction in which the hydraulic motor 12 is rotated in the forward direction.

  The second control valve 24 is disposed between the second hydraulic pump 23 and the hydraulic circuit 14. The second control valve 24 switches between supplying and shutting off the pressure oil from the second hydraulic pump 23 to the hydraulic circuit 14. The second control valve 24 is configured by a two-position four-port electromagnetic switching valve having a D position and an E position, and each position is switched based on a control signal transmitted from the control unit 6.

  Specifically, the second control valve 24 is switched to the D position when the engine 3 is driven, and shuts off the second hydraulic pump 23 and the hydraulic circuit 14. On the other hand, the second control valve 24 is configured to be switched to the E position when the discharge control unit 25 receives the idling stop signal, as will be described later. At the E position, the second hydraulic pump 23 and the hydraulic circuit 14 are connected to each other, and the pressure oil is circulated between the hydraulic circuit 14 and the tank 26 in a direction in which the hydraulic motor 12 is rotated in the forward direction.

  The discharge control unit 25 is configured to detect the charge amount of the second battery 21 and control the discharge of the second battery 21 according to the charge amount when receiving the idling stop signal from the control unit 6. Is done.

  FIG. 3 is a functional block diagram of the discharge control unit 25.

  The discharge control unit 25 includes a reception unit 251, a detection unit 252, an output adjustment unit 253, and a controller 254. The discharge controller 25 is configured as a control device that controls the operation of the second drive circuit 52.

  The receiving unit 251 is electrically connected to the control unit 6 of the vehicle body unit 10 and configured to receive an idling stop signal from the control unit 6. The receiving unit 251 is connected to the control unit 6 by wire, but may be connected wirelessly.

  The detection unit 252 is configured to be able to detect the charge state of the second battery 21. In the present embodiment, the detection unit 252 detects the state of charge (SOC) of the second battery 21. The amount of charge is the remaining capacity when the fully charged state (or initial capacity) of the second battery 21 is 100%, and may be measured by current integration, or the IV characteristics of the battery 21 acquired in advance. It may be determined based on the data.

  The output adjustment unit 253 is arranged between the second battery 21 and the electric motor 22 and is configured to be able to adjust the discharge output of the second battery 21. In the present embodiment, the output adjustment unit 253 includes a plurality of switching elements such as FETs (Field Effect Transistors), and pulses the discharge output (voltage) of the second battery 21 at a predetermined duty ratio determined by the controller 254. Width modulation (PWM) is performed.

  When the controller 254 receives the idling stop signal via the receiver 251, the controller 254 acquires the charge amount of the second battery 21 via the detector 252. Then, the controller 254 determines whether or not the charge amount of the second battery 21 exceeds a predetermined value. If the charge amount exceeds the predetermined value, the controller 254 determines a duty ratio according to the charge amount.

  Specifically, when the charge amount of the second battery 21 exceeds a predetermined value, the controller 254 outputs the output adjustment unit 253 so that the second battery 21 is discharged at a lower duty ratio as the charge amount is higher. To control. In this embodiment, when the charge amount of the second battery 21 exceeds the predetermined value, the controller 254 controls the output adjustment unit 253 so that the second battery 21 is discharged with the discharge output at the predetermined value. .

  The predetermined value is not particularly limited, and is typically set to an appropriate value capable of outputting electric power necessary to rotate the mixer drum 1 at a target rotational speed.

  In this case, the predetermined value is a charge amount for outputting electric power corresponding to reference electric power for rotating the mixer drum 1 at a predetermined rotational speed when idling is stopped. When the amount of charge exceeds the predetermined value, the controller 254 pulse-discharges the second battery 21 at a duty ratio that provides an output corresponding to the reference power.

  The rotation speed of the mixer drum 1 at the time of idling stop is not specifically limited, For example, you may set to rotation speed lower than the rotation speed of the mixer drum 1 at the time of driving | running | working. In this embodiment, the mixer drum 1 is rotated at a first rotation speed (for example, 2 rotations per minute) when the engine is driven, and a second rotation speed (for example, 0.8 to 1 rotation per minute) when idling is stopped. To rotate the mixer drum 1.

  The control range of the duty ratio is not particularly limited, and in this embodiment, the duty ratio is adjusted in a range where the charge amount (SOC) of the second battery 21 is 50% or more and 100% or less. FIG. 4 shows an example of the relationship between the charge amount (SOC) of the second battery 21 and the duty ratio in the pulse discharge control.

  As shown in FIG. 4, the discharge control unit 25 is configured to pulse discharge the second battery 21 when the amount of charge (SOC) of the second battery 21 exceeds 50%. Thereby, it is possible to prevent the second battery 21 from being discharged at an output exceeding the reference power, and to realize energy saving of the rotational power of the mixer drum 1. In the case of this example, the predetermined value is a charge amount of 50%, and the reference power is an output voltage corresponding to the charge amount of 50%, but it is of course not limited to this example.

  In general, the storage battery tends to discharge at a higher output as the charge amount is higher. Therefore, the discharge control unit 25 is configured to pulse-discharge the second battery 21 with a lower duty ratio as the charge amount is higher. In the present embodiment, the duty ratio is 95% when the charge amount of the second battery 21 is 70%, and the duty ratio is 80% when the charge amount is 100%. The discharge output of the second battery 21 is subjected to pulse width modulation. FIG. 5A shows an example of output control at a duty ratio of 90%.

  Further, the discharge control unit 25 linearly decreases the duty ratio with the first gradient when the charge amount of the second battery 21 exceeds 50% and is 70% or less, and the charge amount is 70%. In the range of over 100% and less than 100%, the duty ratio is decreased with a second gradient that is larger than the first gradient. As a result, the mixer drum 1 can be stably rotated at the second rotational speed without depending on the amount of charge.

  The first and second gradients are not particularly limited, and can be appropriately set according to the discharge characteristics of the storage battery constituting the second battery 21. Moreover, the change of the duty ratio with respect to the charge amount is not limited to being linear, and may be curvilinear or may be stepped (stepped).

  On the other hand, when the charge amount of the second battery 21 is equal to or less than the predetermined value (charge amount 50%), the discharge control unit 25 sets the discharge output of the second battery 21 to the duty ratio 100 as shown in FIG. % Pulse width modulation (continuous discharge). As a result, the mixer drum can be rotated at the second rotational speed or less. FIG. 5B shows an example of output control at a duty ratio of 100%.

[Operation of mixer truck and discharge controller]
Next, typical operations of the mixer vehicle 100 and the discharge controller 25 configured as described above will be described.

  The mixer truck 100 with the ready-mixed mixer mounted on the mixer drum 1 agitates the ready-mixed mixer in the mixer drum 1 while rotating the mixer drum 1 in a forward direction at a predetermined rotational speed from the concrete plant to the placement site.

  Here, when the mixer vehicle 100 is traveling, as shown in FIG. 2, the first control valve 13 is in the A position and the second control valve 24 is in the D position. As a result, the mixer drum 1 is rotated in the forward direction at the first rotational speed by the first drive circuit 51 using the engine 3 as a drive source. Further, the first battery 5 and the second battery 21 are charged by the generator 4 while the mixer vehicle 100 is traveling.

  On the other hand, when the mixer vehicle 100 stops due to a signal waiting, traffic jam or the like, and detects a predetermined condition for executing a predetermined idling stop function (for example, operation of a parking brake), the control unit 6 executes the idling stop function. Then, the driving of the engine 3 is stopped. The control unit 6 further transmits an idling stop signal to the discharge control unit 25, and switches the first control valve 13 from the A position to the B position and the second control valve 24 from the D position to the E position.

  FIG. 6 is a flowchart for explaining the operation of the discharge controller 25.

  The discharge controller 25 receives an idling stop signal via the receiver 251. When the controller 254 receives the idling stop signal, the controller 254 acquires the charge amount (SOC) of the second battery 21 from the detection unit 252 and determines whether or not the charge amount exceeds a predetermined value (SOC 50%) ( ST101, ST102).

  When the charge amount of the second battery 21 exceeds the predetermined value, the controller 254 performs pulse width modulation on the discharge output of the second battery 21 in the output adjustment unit 253 with a duty ratio corresponding to the charge amount (ST103). 104).

  The electric motor 22 is rotated by the modulated output of the second battery 21, and the second hydraulic pump 23 discharges pressure oil corresponding to the rotation speed of the electric motor 22 to the hydraulic circuit 14. The hydraulic motor 12 is driven by the pressure oil discharged from the second hydraulic pump 23 and rotates the mixer drum 1 in the forward direction. As a result, the drive source of the mixer drum 1 is switched from the first drive circuit 51 to the second drive circuit 52.

  In the present embodiment, as shown in FIG. 4, the discharge control unit 25 is configured to pulse discharge the second battery 21 with a lower duty ratio as the charge amount increases. Thereby, even when the charge amount of the second battery 21 is large, it is not necessary to discharge the second battery 21 with an output more than necessary, so that it is possible to save energy of the rotational power of the mixer drum 1.

  In the present embodiment, the predetermined value is a charge amount that outputs power corresponding to the reference power for rotating the mixer drum 1 at the second rotational speed when idling is stopped. The second battery 21 is pulse-discharged at a duty ratio that provides an output corresponding to the reference power. Accordingly, the mixer drum 1 can be stably rotated at the target rotation speed (second rotation speed) without depending on the charge amount of the second battery 21, and energy saving of the rotational power of the mixer drum 1 can be achieved. Can be realized.

  On the other hand, when the charge amount of the second battery 21 is equal to or less than the predetermined value, the controller 254 continuously discharges the second battery 21 (ST105). Thereby, the mixer drum 1 can be rotated at the predetermined number of rotations or less. In this case, even if the amount of charge of the second battery 21 is equal to or less than a predetermined value, the minimum number of rotations of the mixer drum 1 necessary for stirring the raw food is ensured.

  When the charge amount of the second battery 21 is so low that the minimum number of rotations of the mixer drum 1 necessary for stirring the raw food can not be secured, the discharge control unit 25 requests the control unit 6 to stop executing the idling stop function. May be configured to transmit a signal to be transmitted.

  When detecting a vehicle driving operation (for example, release of the parking brake) by the driver, the control unit 6 moves the first control valve 13 from the B position to the A position, and the second control valve 24 from the E position to the D position. After switching to each, the engine 3 is driven. Then, the control unit 6 stops transmission of the idling stop signal to the discharge control unit 25. Thereby, in discharge control unit 25, controller 254 stops discharge of second battery 21 in output adjustment unit 253 (ST106). As a result, the drive source of the mixer drum 1 is switched from the second drive circuit 52 to the first drive circuit 51.

  As described above, according to the present embodiment, the mixer drum 1 can be stably rotated at the second rotational speed even when idling is stopped. Further, it is possible to prevent the mixer drum 1 from rotating at an unnecessarily high rotational speed, and to realize energy saving of the rotational power of the mixer drum 1.

  Further, when a lithium ion battery having a relatively high output voltage per unit cell is used as the second battery 21, it is often difficult to optimize the output voltage to the drive voltage of the electric motor 22. Even in such a case, according to the present embodiment, the discharge output can be easily adjusted according to the amount of charge of the second battery 21, and the electric motor 22 can be driven at a desired number of revolutions. it can.

  Moreover, since the electric motor 22 is a DC motor, the rotational speed and rotational torque can be easily adjusted with the input voltage. According to the present embodiment, since the discharge output of the second battery 21 can be controlled so that the rotation speed and rotation torque of the target electric motor can be obtained, the amount of raw control in the mixer drum 1 can be controlled. The mixer drum 1 can be rotated at a stable number of rotations without depending on it.

  Furthermore, according to the present embodiment, since the discharge output of the second battery 21 can be controlled with high accuracy, it is possible to use an electric motor having a lower maximum rating than the battery capacity to be used. The range of selection of the electric motor 22 can be expanded. As a result, the degree of freedom in designing the mixer vehicle 100 or the second drive circuit 52 can be improved.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  For example, in the above embodiment, the second control valve 24 in the second drive circuit 52 is configured to be switched by the control unit 6, but instead, by the controller 254 in the discharge control unit 25. Switching control may be performed.

  Moreover, although the 2nd battery 21 in the 2nd drive circuit 52 was comprised by the lithium ion battery, other secondary batteries, such as a nickel-hydrogen storage battery and a lead storage battery, may be used.

  Furthermore, the controller 254 in the discharge control unit 25 may be configured to perform charging control from the generator 4 to the second battery 21. Thereby, it is possible to eliminate the necessity of providing a dedicated charge control circuit while suppressing the deterioration of the second battery 21.

DESCRIPTION OF SYMBOLS 1 ... Mixer drum 3 ... Engine 4 ... Generator 5 ... 1st battery 6 ... Control part 10 ... Car body part 11 ... 1st hydraulic pump 12 ... Hydraulic motor 21 ... 2nd battery 22 ... Electric motor 23 ... 2nd Hydraulic pump 25 ... discharge control unit 51 ... first drive circuit 52 ... second drive circuit 251 ... receiver 252 ... detector 253 ... output adjuster 254 ... controller

Claims (4)

A vehicle body portion including an engine, a generator that generates electric power by the engine, a control unit that controls the engine, and a mixer drum;
A first drive circuit comprising: a hydraulic motor that rotates the mixer drum; and a first hydraulic pump that is driven by the power of the engine and supplies liquid to the hydraulic motor;
A storage battery that stores the output of the generator; an electric motor that is driven by the discharge of the storage battery; a second hydraulic pump that is driven by the electric motor and supplies liquid to the hydraulic motor; A charge amount of the storage battery is detected when an idling stop signal is received, and the charge amount is a predetermined value that is a charge amount for outputting power corresponding to a reference power for rotating the mixer drum at a predetermined rotation speed. determines whether or not exceeded, if the charge amount exceeds the predetermined value, the charging amount is pulse discharge the battery at a higher low duty ratio, when the charge amount is less than the predetermined value mixer truck having a second drive circuit having a discharge control unit that Ru is continuously discharging the storage battery. The mixer vehicle according to claim 1,
Before Symbol discharge control section, when the charge amount exceeds the predetermined value, mixer truck for pulse discharge the battery at a duty ratio output corresponding to the reference power is obtained. A generator that generates power using engine power, a control unit that controls the engine, a hydraulic motor that rotates a mixer drum, a storage battery that stores the output of the generator, and an electric motor that is driven by a discharge from the storage battery A hydraulic pump driven by the electric motor and supplying a liquid to the hydraulic motor, and a control device mounted on a mixer vehicle,
A receiving unit capable of receiving an idling stop signal from the control unit;
A detection unit for detecting a charge amount of the storage battery;
When the idling stop signal is received, the detected charge amount of the storage battery exceeds a predetermined value that is a charge amount for outputting power corresponding to reference power for rotating the mixer drum at a predetermined rotation speed. When the charge amount exceeds the predetermined value, the storage battery is pulse-discharged with a lower duty ratio as the charge amount is higher, and the charge amount is lower than the predetermined value when the charge amount is lower than the predetermined value. control apparatus comprising a controller Ru storage battery was continuously discharged. A mixer drum rotation control method for driving an electric motor by discharging by a storage battery at idling stop of a mixer car and rotating the mixer drum at a predetermined rotation speed by the output of the electric motor,
Determining whether or not a charge amount of the storage battery exceeds a predetermined charge amount for outputting electric power corresponding to a reference electric power for rotating the mixer drum at the predetermined rotational speed;
When the charge amount exceeds the predetermined charge amount, the storage battery is pulse-discharged at a duty ratio that provides an output corresponding to the reference power,
A mixer drum rotation control method for continuously discharging the storage battery when the charge amount is equal to or less than the predetermined charge amount.

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