JP2017163625A - Control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control apparatus capable of performing control of a total output while continuing an output of a specific channel.SOLUTION: A control apparatus is a control apparatus comprising an electric power distributor in which a power source voltage is applied, and an electric power is distributed and supplied to a plurality of devices through a plurality of channels. The control apparatus comprises: a temperature sensor that measures a temperature of the control apparatus; a maximum current calculation part that calculates the maximum output circuit capable of being outputted by the control apparatus on the basis of the temperature measured by the temperature sensor; and a limitation command calculation part that calculates a limitation command for limiting an electric power consumption of at least any one of the plurality of devices on the basis of the maximum output circuit calculated by the maximum circuit calculation part. The electric power distributor limits the electric power supplied to at least any one of devices so that the current outputted by the control apparatus does not excess the maximum output circuit on the basis of the limitation command calculated by the limitation command calculation part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a control device that adjusts the power consumption of a device in accordance with the state of a power supply.

Construction machines have a variety of types and quantities of solenoid valves and relays used depending on the model, but control devices that supply power to solenoid valves and relays may be shared by multiple vehicle types to reduce costs. Many. If a control device is manufactured on the assumption that the maximum current of all vehicle types is output under the maximum temperature environment that can be assumed, the control device becomes excessively large and expensive, and measures are required.
Patent Document 1 discloses an apparatus including a current reduction circuit that forcibly reduces a load current when a predetermined temperature or higher is detected.

JP-A-5-284737

  In the invention described in Patent Document 1, it is impossible to limit the total power output while maintaining the power output to a specific device.

  According to a first aspect of the present invention, the control device is a control device comprising a power distributor to which power supply voltage is applied and which distributes and supplies power to a plurality of devices via a plurality of channels, A temperature sensor that measures the temperature of the control device, a maximum current calculation unit that calculates the maximum output current that can be output by the control device based on the temperature measured by the temperature sensor, and the maximum output that the maximum current calculation unit calculates A limit command calculation unit that calculates a limit command that limits power consumption of at least one of the plurality of devices based on current, and the power distributor is a limit command calculated by the limit command calculation unit Based on the above, the power supplied to the channel of the at least one device is limited so that the current output from the control device does not exceed the maximum output current.

  According to the present invention, since the current output is limited for each device, it is possible to limit the total power output while maintaining the power output to a specific device.

Side view of excavator 100 The block diagram which shows the structure of the control apparatus 10, and the apparatus connected to the control apparatus 10 Visualization of maximum current characteristic information 12b The figure which shows the flow of information and the flow of electric power accompanying operation | movement of the control apparatus 10. Flow chart representing operation of power control unit 122 The figure which shows an example of the consumption current information 12c The figure which shows an example of the priority information 13a The figure which shows the process example in step S306 of FIG. 5, S307

(First embodiment)
Hereinafter, with reference to FIGS. 1-8, 1st Embodiment of the control apparatus concerning this invention is described.
FIG. 1 is a side view of a hydraulic excavator 100 including a control device according to the present invention. As shown in FIG. 1, a hydraulic excavator 100 includes a traveling body 101 and a revolving body 102 that is turnably mounted on the traveling body 101. The traveling body 101 travels by driving a pair of left and right crawlers by a traveling motor.

  A driver's cab 107 is provided on the left side of the front part of the swivel body 102, and an engine room 108 is provided at the rear of the driver's cab 107. The cab 107 houses an operation unit that is operated by an operator, a control device that issues an operation command to an electromagnetic valve, and the like. The engine chamber 108 houses an engine, a diesel particulate filter (DPF) that purifies the exhaust of the engine, a DPF regeneration device that recovers the DPF collection capability, an alternator, a hydraulic device, and the like. . A counterweight 109 for balancing the airframe during work is attached to the rear of the engine compartment. A front working device 103 is provided on the right side of the front portion of the swivel body 102.

  The front work device 103 includes a plurality of front members, that is, a boom 104, an arm 105, and a bucket 106. The boom 104 is pivotally attached to the front part of the swing body 102 at the base end. One end of the arm 105 is rotatably attached to the tip of the boom 104. The boom 104 and the arm 105 are driven up and down by the boom cylinder 104a and the arm cylinder 105a, respectively. The bucket 106 is attached at the tip of the arm 105 so as to be rotatable in the vertical direction with respect to the arm 105, and is driven by a bucket cylinder 106a.

FIG. 2 is a block diagram illustrating a configuration of the control device 10 accommodated in the cab 107 and devices connected to the control device 10. The control device 10 includes, as output devices 20, a boom solenoid valve 21, an arm solenoid valve 22, a bucket solenoid valve 23, a relief pressure adjusting circuit 24, an arm regeneration solenoid valve 25, an excavation regeneration solenoid valve 26, an emergency stop valve 27, and a DPF. A regenerative solenoid valve 28 and an attachment relief solenoid valve 29 are connected, and a power source 32, an operation lever 33, a mode switch 34, and a power digging switch 35 are connected as input devices.
The control device 1 is provided with a power distributor 17 that controls power supply to the output device 20. Boom solenoid valve 21, arm solenoid valve 22, bucket solenoid valve 23, relief pressure adjustment circuit 24, arm regeneration solenoid valve 25, excavation regeneration solenoid valve 26, emergency stop valve 27, DPF regeneration solenoid valve 28, and attachment relief solenoid valve 29 Each of the output devices 20 is supplied with power from the power distribution unit 17 via the channels 17a to 17i.

The power source 32 includes an alternator that generates electric power using the driving force of the engine 31, a rectifier that rectifies the generated electric power, and a battery, and supplies DC power to the control device 10.
The operation lever 33 is operated by an operator and outputs operation target values of the boom 104, the arm 105, and the bucket 106 to the control device 10.
The mode switch 34 is operated by an operator, and outputs either the power mode or the eco mode to the control device 10 as a characteristic related to the operation of the excavator 100. The power mode is a mode that emphasizes high output, and the eco mode is a mode that emphasizes fuel efficiency. The control device 10 changes the operation characteristics of the boom 104, the arm 105, and the bucket 106 with respect to the operation amount of the operation lever 33, for example, the operation speed, according to the input operation mode.
The power digging switch 35 is operated by an operator and outputs a power digging command for temporarily increasing the excavating force to the control device 10. When the power digging command is input, the control device 10 increases the relief pressure of the front drive circuit to the relief pressure adjusting circuit 24 described later to increase the excavating force.

(Configuration of output device 20)
The output device 20 has a boom solenoid valve 21, an arm solenoid valve 22, a bucket solenoid valve 23 that controls flow rate, a relief pressure adjustment circuit 24 that performs operations related to performance, and an arm regeneration solenoid valve 25 that performs operations related to fuel consumption. And an excavation regeneration electromagnetic valve 26, an emergency stop valve 27 that performs operations related to safety and the environment, a DPF regeneration electromagnetic valve 28, and an attachment relief solenoid valve 29. Such classification is called grouping, and power limitation can be performed for each group.

The boom solenoid valve 21, the arm solenoid valve 22, and the bucket solenoid valve 23 control the flow rates of pressure oil introduced into the boom cylinder 104a, the arm cylinder 105a, and the bucket cylinder 106a, respectively.
The relief pressure adjusting circuit 24 has an electromagnetic variable relief valve (not shown), and increases or decreases the relief pressure of the front drive circuit of the excavator. When a command for changing the relief pressure is input to the relief pressure adjusting circuit 24, the pressure of the pressure oil supplied to the boom cylinder 104a, the arm cylinder 105a, and the bucket cylinder 106a is increased or decreased, and the excavation force is increased or decreased.
Note that when the control device 10 outputs an alternative command for increasing or not increasing the relief pressure, the relief pressure is controlled to either a normal value or a boosted value.

  The arm regeneration electromagnetic valve 25 is switched between the communication position (A) and the cutoff position (B) according to an operation command from the control device 10. When the arm regenerative solenoid valve 25 holds the communication position (A), the pressure oil discharged from one of the rod side oil chamber and the bottom side oil chamber of the arm cylinder 105a returns to the tank. On the other hand, when the arm regeneration electromagnetic valve 25 is switched to the cutoff position (B), the pressure oil discharged from one of the rod side oil chamber and the bottom side oil chamber of the arm cylinder 105a returns to the tank. Without being supplied (regenerated) to the other oil chamber. Therefore, when the arm regeneration electromagnetic valve 25 is switched to the shut-off position (B) when lowering the arm 105, the arm 105 can be lowered by the weight of the arm 105 and the bucket 106 without supplying pressure oil to the arm cylinder 105a. So it saves energy.

  The excavation regeneration electromagnetic valve 26 is switched between the communication position (A) and the cutoff position (B) by an operation command from the control device 10. When the excavation regeneration electromagnetic valve 26 holds the cutoff position (B), the boom cylinder 104a and the arm cylinder 105a are shut off in a circuit. When excavation regeneration electromagnetic valve 26 switches to the communication position (A) when raising boom 104, the pressure oil discharged from the rod side oil chamber of boom cylinder 104a is supplied to the bottom side oil chamber of arm cylinder 105a. As a result, the arm cylinder 105a extends, which saves energy required for excavation.

The emergency stop valve 27 is an electromagnetic valve that stops the supply of pressure oil to the boom cylinder 104a, the arm cylinder 105a, and the bucket cylinder 106a. When the emergency stop valve 27 is operated, the operations of the boom 104, the arm 105, and the bucket 106 are stopped regardless of the input to the operation lever 33.
The DPF regeneration electromagnetic valve 28 is an electromagnetic valve for operating the DPF regeneration device when the excavator 100 is stopped, and generates a hydraulic load similar to that when the excavator 100 is operating in the hydraulic circuit. .
The attachment relief solenoid valve 29 is a solenoid valve that adjusts the relief pressure so as to be equal to or lower than an allowable pressure suitable for the attachment attached to the excavator 100.

(Configuration of control device)
The control device 10 includes a CPU 11, a ROM 12, a RAM 13, a temperature sensor 14, a signal generation unit 15, and a power distribution unit 17. Below, CPU11, ROM12, and RAM13 are collectively called the calculation part 10A.
The ROM 12 stores a program 12a, maximum current characteristic information 12b, and consumption current information 12c.
A function that is executed by the program 12a as a functional block is a control calculation unit 121 and a power control unit 122 described later.

The maximum current characteristic information 12b is a characteristic relating to the control device 10, and is information indicating the relationship between the temperature of the control device 10 and the maximum output current that can be output by the control device 10 under the temperature condition. The maximum current characteristic information 12b is expressed by a lookup table or a function.
FIG. 3 is a diagram visualizing the maximum current characteristic information 12b. The horizontal axis represents the temperature of the control device 10, and the vertical axis represents the maximum output current. As shown in FIG. 3, the current that can be output from the control device 10 decreases as the temperature rises, and the current that can be output becomes zero when the temperature reaches tmax. That is, the maximum value of the current that can be output by the control device 10 depends on the temperature of the control device 10.

The RAM 13 stores priority information 13a and calculation process information by the program 12a. The priority information 13a is information indicating which device operation is prioritized for each device constituting the output device 20. In this embodiment, a priority is set for each mode.
The temperature sensor 14 measures the temperature of the control device 10 and outputs it to the power control unit 122.
Based on the operation command output from the control calculation unit 121 and the limit command output from the power control unit 122, the signal generation unit 15 prevents the current supplied to the output device 20 from exceeding the maximum current value included in the limit command. An operation command and a restriction command are output to the power distribution unit 17.

The signal generation unit 15 includes a channel-device correspondence table (not shown) in which each identifier of the output device 20 is associated with a channel to which the output device 20 is connected. When the signal generation unit 15 receives the device identifier and the maximum current value from the power control unit 122, the signal generation unit 15 temporarily limits the power supply to the device below the received maximum current value, and then ends the limitation. When received, the restriction on power supply to the device is terminated.
The power distribution unit 17 outputs an operation command signal, for example, a current of 100 to 1000 mA, to each output device 20 based on the operation command and the limit command output from the signal generation unit 15.

(Explanation of operation of control device)
FIG. 4 is a diagram illustrating the flow of information and power accompanying the operation of the control device 10. In FIG. 4, the functions executed by the calculation unit 10 </ b> A are represented as three functional blocks of the control calculation unit 121, the power control unit 122, and the signal generation unit 15. The power control unit 122 includes a maximum current calculation unit 122A and a limit command calculation unit 122B.
The control calculation unit 121 changes the priority information 13 a based on the setting of the mode switch 34. For example, when the mode switch 34 is set to the power mode, the priority is set so that the power supply to the device that increases the output is given priority over the power supply to the device that suppresses fuel consumption.
Priority information corresponding to each operation mode is stored in the ROM 12 in advance, and the control calculation unit 121 may be configured to specify priority information read by the power control unit 122 instead of creating the priority information 13a. Good.

The control calculation unit 121 calculates based on inputs from the operation lever 33, the mode switch 34, and the power digging switch 35, and calculates an operation command to the output device 20. Then, the calculated operation command is output to the signal generation unit 15, and the identifier of the output device 20 to which the operation command is output is output to the power control unit 122.
The signal generation unit 15 generates an operation command signal via the power distribution unit based on the operation command input from the control calculation unit 121 and outputs the operation command signal to the output device 20.

  The power control unit 122 receives the identifier of the output device 20 that is the target of the operation command from the control calculation unit 121 and the temperature sensor 14 receives the temperature of the control device 10. The power control unit 122 calculates the total current consumed by the output device 20 using the current consumption information 12c read from the ROM 12 and the identifier of the output device 20 that is the target of the operation command. Next, the maximum current calculation unit 122A of the power control unit 122 calculates the maximum current that can be output using the maximum current characteristic information 12b read from the ROM 12 and the temperature of the control device 10 detected by the temperature sensor 14. To do. Then, the power control unit 122 compares the maximum current that can be output with the integrated total consumption current, and performs the following calculation if the integrated total consumption current exceeds the maximum current that can be output.

  In other words, the limit command calculation unit 122B of the power control unit 122 reads the priority information 13a stored in the RAM 13, integrates the current consumption of the output device 20 that is the target of the operation command in descending order of the priority, and the integrated value. Identifies the device selected immediately before it is determined that exceeds the maximum current that can be output. Then, the restriction command calculation unit 122B sets the specified device and the output device 20 that is the target of the operation command and has a lower priority than the specified device as a device that limits power supply. In other words, the power distributor 17 sequentially integrates the devices that supply current from the consumption current of the devices with higher priority, and limits the power supply to the devices whose integrated value exceeds the maximum output current. In addition, the maximum current that can be supplied to a device that limits power supply is calculated. The limit command calculation unit 122B of the power control unit 122 outputs a limit command to the signal generation unit 15. The restriction command includes information for specifying a device to be restricted and information on a maximum current value supplied to the specified device.

(flowchart)
With reference to FIG. 5, the operation of the power control unit 122 will be described with reference to a flowchart.
When the name of a device that outputs an operation command is input from the control device 10, the power control unit 122 starts the process illustrated in FIG. 5. The execution subject of each step described below is the CPU 11 of the control device 10.
In step S301, the consumption current information 12c is read from the ROM 12, and the total consumption current required for the operation of the device corresponding to the identifier input from the control device 10 is calculated. Next, the process proceeds to step S302.

In step S302, the temperature of the control device 10 is read from the temperature sensor 14, and the process proceeds to step S303.
In step S303, the maximum current characteristic information 12b is read from the ROM 12, the maximum output current corresponding to the temperature read in step S302 is calculated, and the process proceeds to step S304.

In step S304, it is determined whether or not the maximum output current calculated in step S303 is equal to or greater than the total current calculated in step S301. If it is determined that the maximum output current is equal to or greater than the total current, that is, if the total current consumption is less than the current that can be output by the control device 10, that is, less than the maximum output current, the determination in step S304 is affirmative and the process proceeds to step S305 . When it is determined that the maximum output current is equal to or greater than the total consumption current value, that is, when it is determined that the current that can be output by the control device 10 is insufficient, the process proceeds to step S306.
In step S305, an output signal for canceling the output restriction is generated, and the process proceeds to step S309.

In step S306, the priority information 13a is read from the RAM 13, a current is assigned from a device having a higher priority among the devices corresponding to the identifier received from the control device 10, and a current necessary for operation is obtained within the range of the maximum output current. A device that is not allowed, that is, a restricted device is determined.
In step S307, an allowable current, which is the maximum allowable output current, is calculated for the restriction target device determined in step S306. The allowable current is the difference between the maximum output current and the sum of power consumption of devices other than the restriction target device when there is one restriction target device. For example, when there are two or more devices to be restricted, the remaining current may be assigned to the device with the highest priority among the devices to be restricted, and the allowable current of other devices to be restricted may be set to zero. The current may be evenly distributed by the target device.
In step S308, a signal indicating each of the restriction target device determined in step S306 and the allowable current value of the restriction target device determined in step S307 is generated, and the process proceeds to step S309.
In step S309, the signal generated in step S305 or step S308 is output to the signal generation unit 15, and the series of operations ends.

The current limiting process by the power control unit 122 is generally as follows.
For example, the power control unit 122 receives identifiers corresponding to the output devices A, B, C, and D from the control calculation unit, and these current consumptions are 0.5 A, 0.5 A, 0.5 A, and 1 A, respectively, A case where the value is 2.5 A and the current that can be output by the control device 10 (maximum output current) is 2 A will be described as an example. The total consumption current value is 2.5A> the maximum output current is 2A, and the current consumption is integrated from the output devices with higher priority, and the output device when the integrated value exceeds 2A is determined. In the above example, the total consumption current value of the output devices A, B, and C is 1.5 A, and when the consumption current 1 A of the output device D is added, the maximum output current 2 A is exceeded. Therefore, in order to limit the current for the output device D, the limit current is obtained as (2A−1.5A) = 0.5 A, and the current consumption of the output device D is limited to 0.5 A or less.

(Control device operation example)
An operation example of the power control unit 122 will be described with reference to FIGS.
FIG. 6 is a diagram illustrating an example of the consumption current information 12c, and FIG. 7 is a diagram illustrating an example of the priority information 13a. Note that the higher the numerical value, the higher the priority. As described above, the current consumption information 12c describes the current required for the operation of each of the output devices 20. In the example shown in FIG. 6, for example, it is described that 0.5 A is required for the operation of the boom electromagnetic valve 21 and 0.4 A is required for the operation of the arm electromagnetic valve 22. As described above, the priority information 13a describes information indicating which device has priority for operation. 7A shows the priority information 13a created by the control calculation unit 121 when the mode switch 34 is set to the eco mode, and FIG. 7B shows the mode switch 34 set to the power mode. In this case, the priority information 13a created by the control calculation unit 121 is shown. Both FIG. 7A and FIG. 7B are grouped based on the function of the device and the priority is set. 7 (a) and 7 (b), the priority of the relief pressure adjusting circuit 24 that performs operations related to performance, and the priority of the arm regeneration electromagnetic valve 25 and excavation regeneration electromagnetic valve 26 that perform operations related to fuel efficiency. Have been replaced.

In the following description, the maximum output current corresponding to the current temperature of the control device 10 is 0.6 A, the mode switch 34 is set to the eco mode, and the control calculation unit 121 outputs the following device identifiers to the power control unit 122. I decided to. That is, the names of the arm solenoid valve 22, the relief pressure adjustment circuit 24, the arm regeneration solenoid valve 25, and the DPF regeneration solenoid valve 28 are output to the power control unit 122.
In this case, the power control unit 122 performs the following processing.

The power control unit 122 reads the current consumption information 12c from the ROM 12, and calculates the total current consumption necessary for the arm solenoid valve 22, the relief pressure adjustment circuit 24, the arm regeneration solenoid valve 25, and the DPF regeneration solenoid valve 28 to operate. (Step S301). When the consumption current information 12c is as shown in the example of FIG. 5, the total value of the consumption current is 1.1A.
Next, the power control unit 122 reads the temperature from the temperature sensor 14 (step S302), and calculates the maximum output current with reference to the maximum current characteristic information 12b (step S303). This maximum output current is 0.6 A as described above.
Next, since the total current of the consumption current is larger than the maximum output current (step S304: NO), the power control unit 122 determines the restriction target device and the restriction current as illustrated in FIG. 8 described below. (Steps S306 and S307).

FIG. 8 is a diagram illustrating a processing example in steps S306 and S307 in FIG. The A-B column in FIG. 8 arranges the priority information 13a shown in FIG. 7A in descending order of priority. The column B-C in FIG. 8 is obtained by rearranging the current consumption information 12c shown in FIG. The column C in FIG. 8 shows devices input as operation command targets from the control calculation unit 121 in this operation example. The E column of FIG. 8 is the cumulative total of the current consumption of the device that is the target of the operation command from the top. That is, the accumulated current “0.2” A in the row of “DPF regenerative solenoid valve” is the current consumption of only the DPF regeneration solenoid valve 28, and the accumulated current “0.4” A in the row of “arm regeneration solenoid valve”. Is the cumulative current consumption of the DPF regeneration electromagnetic valve 28 and the arm regeneration electromagnetic valve 25. The accumulated current in the row of the “relief pressure adjusting circuit” is “0.7” A, and the accumulated current in the row of the “arm solenoid valve” is “1.1” A. The F column in FIG. 8 shows the limiting current. Since the accumulated current in the row of “Relief pressure adjustment circuit” in column E and the row of “Arm solenoid valve” exceeds 0.6A, which is the maximum output current, “Relief pressure adjustment circuit” and “Arm solenoid valve” It is determined as a restriction target device. For example, the “relief pressure adjusting circuit” having a high priority is set to the remaining current, that is, (0.6 A−0.4 A) = 0.2 A, and “arm solenoid valve” is set to zero A. Is done.
Next, the power control unit 122 generates a signal indicating that the relief pressure adjusting circuit 24 and the arm solenoid valve 22 are devices to be limited, and a signal indicating the respective limiting currents (steps S307 and S308), and the signal generating unit. 15 (step S309).

According to the first embodiment described above, the following operational effects are obtained.
(1) The control device 10 includes a power distributor 17 that distributes and supplies power to a plurality of devices via a plurality of channels. The control device 10 includes a temperature sensor 14 that measures the temperature of the control device 10, a maximum current calculation unit 122A that calculates the maximum output current that can be output by the control device 10 based on the temperature measured by the temperature sensor 14, and a maximum current calculation. And a limit command calculation unit 122B that calculates a limit command for limiting power consumption of at least one of the plurality of devices based on the maximum output current calculated by the unit 122A. Based on the restriction command calculated by the restriction command calculation unit 122B of the power control unit 122, the signal generation unit 15 outputs the power supplied to the channel of at least one of the devices with the maximum output current of the control device 10. Limit so as not to exceed current.
Since the control device 10 limits the current output for each device, the control device 10 can limit the total power output while maintaining the power output to a specific device.

(2) Devices having a common function among a plurality of devices are grouped into one group, and the signal generation unit 15 limits the power consumption for each group according to the limit command calculated by the limit command calculation unit 122B. Alternatively, channels that supply power to a plurality of devices having a common function among a plurality of channels are grouped together, and the signal generation unit 15 consumes each group according to a restriction command calculated by the power control unit 122. Limit power. That is, the power control unit 122 limits the output for each grouped channel based on the function of the device to which the channel is connected.
Therefore, it is possible to link the limitation of power supply to functionally related devices.

(3) A storage unit that stores the priority for each device, that is, a RAM 13 is further provided. The restriction command calculation unit 122B determines a channel that restricts power supplied from the signal generation unit 15 to the plurality of devices based on the priority.
Therefore, the order of devices that limit power supply can be set according to priority.

(4) The limit command calculation unit 122B compares the maximum output current with the total value of the current supplied from the signal generation unit 15 to the plurality of devices, and the total value of the current supplied from the signal generation unit 15 to the plurality of devices is When the output current is larger than the maximum output current, the signal generation unit 15 sequentially integrates the devices that supply current from the device with the highest priority, starting with the consumption current of the device, and the accumulated current exceeds the maximum output current. A restriction command for restricting the current output from the control device 10 so as not to exceed the maximum output current is calculated.
(5) The control device 10 is mounted on the excavator 100. The calculation unit, that is, the power control unit 122 changes the priority based on an operation mode that is a characteristic relating to the operation of the construction machine determined by the operator.
Therefore, the excavator 100 can be operated with more respect for the operator's decision.

(Modification)
The first embodiment described above may be modified as follows.
(1) In the first embodiment, the priority of the output device 20 is set by grouping based on the function of the output device 20, but the priority is set for each of the output devices 20 without performing grouping based on the function. Different priorities may be set.
(2) The power limiting unit 122 may uniformly set the allowable current value of the device to be limited to zero A. In other words, the calculation of the allowable current value shown in step S307 of FIG. 5 may be omitted, and the restriction command transmitted to the power distribution unit 17 may be configured only from information specifying the restriction target device.
(3) The power limiting unit 122 supplies power corresponding to the standby power to a device that requires standby power, such as holding the valve position, even if the identifier of the device is received from the power control unit 122. May be maintained. In this case, in step S304 in FIG. 5, a value obtained by subtracting the total current corresponding to the standby power of each device from the maximum output current calculated by the power control unit 122 is compared with the total current calculated in step S301. Do.
(4) The control device 10 does not include the consumption current information 12c, and may be substituted by constantly monitoring the output current of the control device 10. That is, the control device 10 may measure the output current value of the control device 10 instead of step S301 in FIG. 5, and may compare the measured output current instead of the total current in step S304. Further, in this case, the maximum output current itself may be compared, or a value based on the maximum output current, for example, 95% of the maximum output current may be compared.

The above-described embodiments and modifications may be combined.
Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

10: Control device 13a: Priority information
14 ... Temperature sensor
17 ... Power distribution unit (power output unit)
17a-17i ... Channel
20 ... Output equipment (equipment)
100… Hydraulic excavator (Construction machinery)
122A: Maximum current calculation unit 122B: Limit command calculation unit

Claims (6)

A control device comprising a power distributor to which power supply voltage is applied and which distributes and supplies power to a plurality of devices via a plurality of channels,
A temperature sensor for measuring the temperature of the control device;
A maximum current calculator that calculates the maximum output current that can be output by the control device based on the temperature measured by the temperature sensor;
Based on the maximum output current calculated by the maximum current calculator, a limit command calculator that calculates a limit command that limits power consumption of at least one of the plurality of devices, and
The power distributor is configured such that, based on a limit command calculated by the limit command calculation unit, the power supplied to the channel of the at least one device is such that a current output by the control device exceeds the maximum output current. A control device characterized by being restricted so as not to exist. The control device according to claim 1,
A group of devices having a common function among the plurality of devices,
The control device, wherein the power distributor limits the power consumption for each of the groups based on a limit command calculated by the limit command calculation unit. The control device according to claim 1,
Channels that supply power to a plurality of devices having a common function among the plurality of channels are grouped together,
The control device, wherein the power distributor limits the power consumption for each of the groups based on a limit command calculated by the limit command calculation unit. The control device according to claim 1,
A storage unit for storing a priority for each device;
The control device, wherein the restriction command calculation unit determines a channel that restricts power supplied from the power distributor to the plurality of devices based on the priority. The control device according to claim 4,
The limit command calculation unit compares the maximum output current with a total value of currents supplied from the power distributor to a plurality of devices, and a total value of currents supplied from the power distributor to the plurality of devices is When the output current is larger than the maximum output current, the current consumption of the devices having higher priority is integrated in order, and the current consumption of the device whose integrated value exceeds the maximum output current is the current output by the control device. A control device that calculates a restriction command for restricting the maximum output current so as not to exceed the maximum output current. The control device according to claim 4,
The control device is mounted on a construction machine,
The control apparatus, wherein the restriction command calculation unit changes the priority based on an operation mode that is a characteristic relating to the operation of the construction machine determined by an operator.

Images