JP5378777B2 - Construction machine noise control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise control apparatus for construction machines, enabling a maximum work within a set range in the case that vehicle noise is set according to a surrounding environment of work. <P>SOLUTION: The noise control apparatus of construction machines includes an engine 1; a variable-displacement-type main hydraulic pump 2 to be rotated by the engine 1 and being a driving hydraulic source of an actuator 7; an oil temperature sensor 26 for detecting the temperature of a hydraulic fluid; a cooling water temperature sensor 27 for detecting the temperature of cooling water of the engine; a compressed air temperature sensor 28 for detecting the temperature of compressed air; a rotational number sensor 29 for detecting the rotational number of the engine; an outside air temperature sensor 31 for detecting the temperature of outside air; a noise value indicating dial 32 for setting a noise value; and a controller 40 for computing the rotational number of the engine etc. enabling a maximum work within a set range of a noise value on the basis of a set noise value and a detection value from each sensor and controlling the rotational number of the engine and a discharge capacity of the main hydraulic pump. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a construction machine noise control device, and more particularly, to a construction machine that enables maximum work within the set range even when vehicle body noise is set in accordance with the surrounding environment of the work. The present invention relates to a noise control device.

  In construction machines, for example, hydraulic excavators, noise is generated as a result of engine operation because it is always used at a higher engine speed than that for excavation work. For this reason, there is a problem that engine noise affects the surroundings when using construction machines, especially in densely populated urban areas such as residential areas and shopping streets.

  In recent years, regulations for noise reduction have become stricter, so it is important to reduce engine noise. For this reason, in order to reduce the noise that the construction machine gives to the surrounding environment, when the engine noise value detected by the noise detector is larger than a predetermined noise level, the maximum engine speed is reduced. Some control (for example, refer to Patent Document 1).

Japanese Utility Model Publication No. 57-12471

  In a large hydraulic excavator of a construction machine, for example, the total noise generated from the entire machine during normal operation is often larger than the noise generated from the engine. For example, when the noise generated during operation of a large hydraulic excavator is defined as the sum of the noise at each site, the noise from the engine is roughly 30%, the noise from the cooling fan is 60%, the hydraulic system, etc. An example in which the noise from the part is 10% is measured.

  Therefore, when the conventional noise control device is applied to such a construction machine, it is necessary to reduce the noise level generated from parts other than the engine. It is not possible to reduce the noise of construction machinery that affects the environment.

  As a result, as the engine speed of the construction machine decreases, the work capacity of the machine decreases significantly. Depending on the noise level to be observed, the work of the construction machine over a long period of time may be required, extending the overall work process. There is a problem that it ends up.

  The present invention has been made based on the above-mentioned matters, and the object of the present invention is to perform the maximum work within the setting range even when the vehicle body noise is set according to the surrounding environment of the work. The present invention provides a noise control device for construction machinery.

  (1) In order to achieve the above object, the present invention provides a construction machine noise control apparatus for controlling construction machine noise, the engine and a hydraulic pressure source for driving an actuator in the construction machine, which is rotated by the engine. A variable displacement main hydraulic pump, an oil temperature sensor that detects the temperature of the hydraulic fluid of the main hydraulic pump, a cooling water temperature sensor that detects the temperature of the cooling water supplied to the cooling system of the engine, A compressed air temperature sensor for detecting the temperature of the compressed air supplied to the intake system of the engine, a rotational speed sensor for detecting the rotational speed of the engine, an outside air temperature sensor for detecting the outside air temperature of the construction machine, and noise A noise value setting dial for setting a value, a noise value set by the noise value indicating dial, and a detection value from each sensor. A controller that calculates the engine speed and the load of the main hydraulic pump that allow maximum work in the enclosure, and controls the engine speed and the discharge capacity of the main hydraulic pump according to the calculated value And

  (2) In order to achieve the above object, the present invention provides a noise control device for a construction machine that controls the noise of the construction machine, the engine being rotated by the engine, and a drive hydraulic source of an actuator in the construction machine A variable capacity main hydraulic pump, and a variable capacity that is driven by the engine and serves as a drive hydraulic source for a fan rotation hydraulic motor that drives a cooling fan that cools hydraulic oil, cooling water, and compressed air in the construction machine Type fan control hydraulic pump, an oil temperature sensor for detecting the temperature of hydraulic oil of the main hydraulic pump, a cooling water temperature sensor for detecting the temperature of cooling water supplied to the cooling system of the engine, and the engine A compressed air temperature sensor for detecting the temperature of the compressed air supplied to the intake system of the engine, a rotational speed sensor for detecting the rotational speed of the engine, A rotation speed sensor for detecting the rotation speed of the rejection fan, an outside air temperature sensor for detecting the outside air temperature of the construction machine, a noise value indication dial for setting a noise value, and a noise value set by the noise value indication dial Based on the detection values from the sensors, the engine speed, the cooling fan speed, and the load of the main hydraulic pump that enable the maximum work within the range of the noise value setting are calculated. And a controller for controlling the engine speed, the discharge capacity of the fan control hydraulic pump, and the discharge capacity of the main hydraulic pump.

(3) above SL (2), preferably, the controller, construction machines and the whole noise level generated from the reference, the combination of the engine speed corresponding to the outside air temperature and the cooling fan speed data, and, A storage unit storing each management temperature value of a cooling fluid including hydraulic oil of the main hydraulic pump, cooling water supplied to the cooling system of the engine, and compressed air supplied to the intake system of the engine; and the noise Based on the noise setting value input from the value indicating dial and the outside air temperature detected by the outside air temperature sensor, it is necessary from the combination data of the engine speed stored in the storage unit and the cooling fan speed. A first procedure for calculating the rotation speed of the engine and the cooling fan, and the temperature of each cooling fluid is lower than the management temperature value of each cooling fluid stored in the storage unit A second procedure for comparing whether or not the temperature detection value of each cooling fluid is determined to be lower than the management temperature value of each cooling fluid by the second procedure. A third procedure for controlling the engine, the main hydraulic pump, and the fan control hydraulic pump using the engine speed and the cooling fan rotational speed as limit signals, respectively, and a temperature detection value of each cooling fluid by the second procedure. Is higher than the control temperature value of each of the cooling fluids, the correction value is added to the engine speed and the cooling fan speed calculated in the first procedure, and the engine and main hydraulic pressures are respectively used as limit signals. It is assumed that a calculation unit that executes a fourth procedure for controlling the pump and the fan control hydraulic pump is provided.

  (4) In the above (3), preferably, the storage unit of the controller further stores a different correction value for each type of the cooling fluid that exceeds the management temperature value, and the calculation unit includes the fourth operation unit. In the procedure, when it is determined that the temperature detection value of each cooling fluid is higher than the management temperature value of each cooling fluid, a different correction value for each type of cooling fluid that exceeds the management temperature value is stored in the storage unit. It is assumed that the engine, the main hydraulic pump, and the fan control hydraulic pump are controlled as a limiting signal by adding this correction value to the engine speed and the cooling fan speed calculated in the first procedure.

  According to the construction machine noise control apparatus of the present invention, the vehicle body noise value set to the target value and the outside air temperature detected by the outside air temperature sensor are input and set in accordance with the outside air temperature and the body noise value. Since the engine speed and the cooling fan speed are calculated and controlled as the limit values, the construction machine can be operated to the maximum within the range of the set vehicle body noise value. As a result, the construction machine can produce the maximum amount of work within the limited noise range, and work efficiency can be improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a construction machine noise control apparatus of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram showing an embodiment of a noise control device for a construction machine according to the present invention. In FIG. 1, reference numeral 1 denotes an engine. The engine 1 is connected to a variable capacity main hydraulic pump 2 that serves as a drive hydraulic pressure source for an actuator in a construction machine, and a variable capacity fan control hydraulic pump 3 that controls the rotation speed of the cooling fan.

  The main hydraulic pump 2 pressurizes the hydraulic oil in the hydraulic oil tank 4 and supplies the hydraulic oil to the control valve 6 through the pipe line 5. The control valve 6 supplies the hydraulic oil from the main hydraulic pump 2 to the hydraulic cylinder 7 and the hydraulic motor 8 that are actuators in the construction machine. The return oil from the control valve 6 is returned to the hydraulic oil tank 4 through the pipe 9, the oil cooler 10, and the pipe 11.

  The fan control hydraulic pump 3 pressurizes the hydraulic oil in the hydraulic oil tank 4 and supplies the discharged hydraulic oil to the fan rotation hydraulic motor 13 through the pipe 12. The hydraulic oil flowing out from the fan rotating hydraulic motor 13 is connected to the pipe line 9 by the pipe line 14. A cooling fan 15 is attached to the output shaft of the fan rotating hydraulic motor 13.

  At locations facing the cooling fan 15, there are an oil cooler 10, a radiator 16 as a radiator of coolant (cooling water) that is a cooling medium of the engine 1, and an intercooler 17 as a radiator of air supplied to the engine 1. And a condenser 19 of the air conditioner 18 are arranged.

  The radiator 16 is connected to the cooling system of the engine 1 by pipe lines 20 and 21. The intercooler 17 has an inlet side connected to the turbocharger 23 by a pipe line 22 and an outlet side connected to the intake system of the engine 1 by a pipe line 24. A condenser 19 of the air conditioner 18 is connected to the air conditioner 18 via a compressor 25 rotated by the engine 1.

  The temperature T2 of the hydraulic oil of the oil cooler 10 described above, the temperature T3 of the cooling water supplied to the cooling system of the engine 1, the temperature T4 of the compressed air supplied to the intake system of the engine 1, the rotational speed of the engine 1, and the cooling In order to detect the rotation speed of the fan 15 and the outside air temperature T1, an oil temperature sensor 26 for detecting the temperature T2 of the hydraulic oil is attached to the pipe 11 on the return side of the oil cooler 10. A cooling water temperature sensor 27 for detecting a temperature T3 of cooling water supplied to the cooling system of the engine 1 is attached to the pipe line 21 of the radiator 16. A compressed air temperature sensor 28 for detecting the temperature T4 of the compressed air supplied to the intake system of the engine 1 is attached to the pipe line 24 of the intercooler 17. The engine 1 and the cooling fan 15 are provided with rotation speed sensors 29 and 30 for detecting the respective rotation speeds. Furthermore, an outside air temperature sensor 31 that detects an outside air temperature T1 is attached to a main body (not shown) of the construction machine.

  The controller 40 includes a controller unit that includes a storage unit (memory) 41 that stores various setting values in advance, a calculation unit (CPU) 42 that executes various procedures, an input unit 43, and an output unit 44. .

  An oil temperature sensor 26, a cooling water temperature sensor 27, a compressed air temperature sensor 28, rotation speed sensors 29 and 30, and an outside air temperature sensor 31 are connected to an input unit 43 of the controller 40, and a detection signal from each sensor is received. Entered. In addition, a noise value instruction dial 32 is connected to the input unit 43 of the controller 40, and a noise setting value set by the noise value instruction dial 32 is input.

  The output unit 44 of the controller 40 outputs, for example, an engine speed command and an engine torque command to an engine controller (not shown). The engine controller can maintain a predetermined engine speed by calculating a necessary fuel injection amount from the command value and controlling a fuel injection control device (not shown). For example, in the case of the main hydraulic pump 2 and the fan control hydraulic pump 3 configured by a swash plate type piston pump, the output unit 44 of the controller 40 is an electromagnetic of a proportional control valve (not shown) that drives and controls the inclination of each swash plate. Outputs a current signal to the solenoid. The electromagnetic solenoid that has received the current signal changes the discharge oil flow rate by changing the valve position of the proportional control valve and drivingly controlling the swash plate of these hydraulic pumps. As a result, the pump loads of the main hydraulic pump 2 and the fan control hydraulic pump 3 are controlled, and the rotational speed of the fan rotating hydraulic motor 13, that is, the rotational speed of the cooling fan 15 is also controlled.

  By the way, in the storage unit 41 of the controller 40, the combination data of the maximum engine speed corresponding to the outside air temperature T1 and the cooling fan speed based on the total noise value that is the sum of the noises generated from the entire construction machine. Is previously input and set. In other words, if the engine 1 and the cooling fan 15 are operated with this rotational speed combination in the state of the outside air temperature T1, the total noise value of the construction machine is equal to or less than a predetermined noise value and operates without problems such as overheating. Can be made. The storage unit 41 stores management temperature values of various cooling fluids for properly operating the construction machine. Examples of the temperature of the various cooling fluids include the temperature T2 of the hydraulic oil in the oil cooler 10, the temperature T3 of the cooling water supplied to the cooling system of the engine 1, the temperature T4 of the compressed air supplied to the intake system of the engine 1, and the like. When any of these detected temperatures exceeds a predetermined management temperature value, measures such as reducing the load on the construction machine are required.

  In addition, the calculation unit 42 of the controller 40 receives an engine that becomes the target noise from the storage unit 41 on the condition that the noise setting value input from the noise value instruction dial 32 and the outside air temperature T1 input from the outside air temperature sensor 31 are used. A procedure for calculating and calculating the rotation speed and the cooling fan rotation speed, and using the calculated engine rotation speed and cooling fan rotation speed as a limit signal, the engine 1, the main hydraulic pump 2, and the fan control hydraulic pump 3 respectively. And control procedures.

An example of setting of the maximum engine speed and the cooling fan speed set based on the total noise value generated from the entire construction machine and the outside air temperature T1 will be described with reference to FIG.
FIG. 2 is an explanatory diagram showing an example of the engine / cooling fan rotation speed based on the total noise value and the outside air temperature stored in the controller of the embodiment of the noise control device for the construction machine according to the present invention. In FIG. 2, the upper table shows the case where the total noise is 115 dB or less, and the lower table shows the case where the total noise is 110 dB or less. In the storage unit 41 of the controller 40, data is stored in such a storage table format. For example, when a storage table is set every 0.1 dB, unstored data (for example, 0.05 dB difference) Noise level) is calculated by interpolation calculation processing. Further, the outside air temperature in the storage table is similarly processed.

  In the upper table of FIG. 2, for example, when the outside air temperature is 15 degrees, it is indicated that the fan rotation speed should be 600 rotations and the engine rotation speed should be 1700 rotations. In other words, when the construction machine is operated under an outside air temperature of 15 degrees and the total noise is 115 dB or less, the fan speed is controlled to 600 rpm and the maximum engine speed is controlled to 1700 rpm. For example, the total noise of the machine can be limited to 115 dB or less and can be continuously operated. On the other hand, when the outside air temperature is 30 degrees, it is necessary to secure the cooling capacity, so that it is necessary to increase the fan rotation speed to 800 rotations and limit the engine rotation speed to 1500 rotations. By operating in such a state, the construction machine can be continuously operated without overheating. These data can be created from experiments with construction machine prototypes and analysis results of each component. The table on the lower side of FIG. 2 shows the engine / fan rotational speed when the construction machine is operated with the total noise being 100 dB or less.

  Next, the operation of the above-described construction machine noise control apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a flowchart showing the calculation of the limit control according to the embodiment of the noise control device for the construction machine of the present invention.

  First, in step (S100) of FIG. 3, when the key switch is turned on, the control power is supplied to the controller 40 and the control program starts, for example, initialization processing is performed. After that, the set target noise value is detected by the noise value indication dial 32 and input to the input unit 43 of the controller 40 as a calculation control condition in the calculation unit 42 (S102).

  In the next step (S104), the outside air temperature sensor 31 attached to the main body of the construction machine detects the outside air temperature T1 and inputs it to the input unit 43 of the controller 40 as a calculation control condition in the calculation unit 42.

  In the next step (S106), the rotational speeds of the engine 1 and the cooling fan 15 that can continue the operation of the construction machine without overheating at the outside air temperature T1 within the set target noise value range are determined by the controller 40. The calculation unit 42 calculates. Specifically, based on the target noise value and the outside air temperature T1 input in the above steps (S102) and (S104), the maximum engine speed stored in the storage unit 41 and the cooling fan speed are calculated. From the combination data, the necessary rotation speeds of the engine 1 and the cooling fan 15 are calculated. These calculated rotation speeds are temporarily stored in the storage unit 42.

  In the next step (S <b> 108), the oil temperature sensor 26 attached to the return line 11 of the oil cooler 10 detects the temperature T <b> 2 of the hydraulic oil, and the cooling water attached to the line 21 of the radiator 16. The temperature sensor 27 detects the temperature T3 of the cooling water supplied to the cooling system of the engine 1, and the compressed air temperature sensor 28 attached to the pipe line 24 of the intercooler 17 supplies the compression supplied to the intake system of the engine 1. The temperature T4 of the air is detected and input to the input unit 43 of the controller 40 as a calculation control condition in the calculation unit 42.

  In the next step (S110), the calculation unit 42 selects a control mode. Specifically, a comparison operation is performed between the temperatures T2 to T4 of the respective cooling fluids input in step (S108) and the management temperature values of the respective cooling fluids stored in the storage unit 41 in advance. If none of the comparison temperature values exceeds the control temperature value as a result of this comparison calculation, it is determined as YES, the normal control mode is selected, and the process proceeds to step (S112).

  In step (S112), the calculation unit 42 reads out the temporarily stored rotation speeds of the engine 1 and the cooling fan 15 calculated in the above-described step (S106), and uses the engine rotation speed and the cooling fan rotation speed as a limiting signal. The engine 1, the main hydraulic pump 2, and the fan control hydraulic pump 3 are controlled. After setting such a limiting signal, the process returns to the previous step (S102).

  If it is determined NO in step (S110) described above, it is a case where the temperature of any one of the cooling fluids exceeds the control temperature value, so that the load on the construction machine is within a predetermined total noise value range. As well as limiting, cooling capacity needs to be increased. Therefore, the correction control mode is selected, and the process proceeds to step (S114).

  In step (S114), the calculation unit 42 reads the temporarily stored engine speeds of the engine 1 and the cooling fan 15 calculated in step (S106) described above, and adds a predetermined correction value to these engine speeds. To calculate the limiting signal. For example, for the rotation speed of the engine 1, -20 rotations are further added from the read value, and +10 rotations are added to the rotation speed of the cooling fan 15 to calculate the limit signal. The engine 1, the main hydraulic pump 2, and the fan control hydraulic pump 3 are controlled using the calculated engine speed and cooling fan speed as limit signals, respectively. After setting such a limiting signal, the process returns to the previous step (S102). Note that, for example, a different correction signal may be stored in the storage unit 41 in advance for each system of the cooling fluids T2 to T4 exceeding the management temperature value, and the value of the correction signal may be increased or decreased. That is, when the oil temperature T2 exceeds the management temperature value, the engine speed is added by −10 rotations, and when the cooling water temperature T3 exceeds the management temperature value, −20 rotations addition is considered. It is done. It is also possible to increase or decrease the correction signal in proportion to the excess of the detected value exceeding the control temperature value. Furthermore, even when the detected value does not exceed the management temperature value, an alarm may be output when the difference between the detected value and the management temperature value is small.

  According to the embodiment of the construction machine noise control device of the present invention described above, the vehicle body noise value set to the target value and the outside air temperature T1 detected by the outside air temperature sensor 31 are input, and the outside air temperature T1. And the number of rotations of the engine 1 and the number of rotations of the cooling fan 15 set in correspondence with the vehicle body noise value are calculated, and these values are controlled as limit values, so within the range of the set vehicle body noise value, The construction machine can be operated to the maximum. As a result, the construction machine can produce the maximum amount of work within the limited noise range, and work efficiency can be improved.

  Further, the temperature of each cooling fluid of the construction machine (such as the temperature T2 of the hydraulic oil, the temperature T3 of the cooling water supplied to the cooling system of the engine 1, the temperature T4 of the compressed air supplied to the intake system of the engine 1) is detected. However, when the control temperature value is exceeded, the load is further limited and the cooling effect is increased, so that it can be operated for a long time without overheating within the range of the set vehicle body noise value. As a result, the burden on the operator is reduced, safe work is facilitated, and work efficiency can be improved.

  In the embodiment of the present invention, the cooling fan 15 is driven by the fan rotation hydraulic motor 13, and the fan control hydraulic pump 3 as a drive hydraulic source of the fan rotation hydraulic motor 13 is provided alone. However, the present invention is not limited to this, and the present invention can be applied as long as the number of rotations of the cooling fan can be controlled.

  In the embodiment of the present invention, a large hydraulic excavator has been described as an example of the construction machine. However, the present invention is not limited to this, and can be applied to other construction machines such as a hydraulic crane.

It is a block diagram which shows one Embodiment of the noise control apparatus of the construction machine of this invention. It is explanatory drawing which shows an example of the data of the engine / cooling fan rotation speed based on the total noise value and external temperature which are memorize | stored in the controller of one Embodiment of the noise control apparatus of the construction machine of this invention. It is a flowchart figure which shows the calculation of the restriction | limiting control by one Embodiment of the noise control apparatus of the construction machine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Main hydraulic pump 3 Fan control hydraulic pump 4 Hydraulic oil tank 7 Hydraulic cylinder 10 Oil cooler 13 Fan rotation hydraulic motor 15 Cooling fan 16 Radiator 17 Intercooler 18 Air conditioner 19 Capacitor 23 Turbocharger 25 Compressor 26 Oil temperature sensor 27 Cooling water temperature sensor 28 Compressed air temperature sensor 29 Engine speed sensor 30 Cooling fan speed sensor 31 Outside air temperature sensor 32 Noise value indication dial 40 Controller 41 Storage section 42 Calculation section 43 Input section 44 Output section

Claims (4)

A construction machine noise control device for controlling construction machine noise,
Engine,
A variable displacement main hydraulic pump that is rotated by the engine and serves as a drive hydraulic source of an actuator in the construction machine;
An oil temperature sensor for detecting the temperature of the hydraulic oil of the main hydraulic pump;
A cooling water temperature sensor for detecting a temperature of cooling water supplied to the cooling system of the engine;
A compressed air temperature sensor for detecting the temperature of the compressed air supplied to the intake system of the engine;
A rotational speed sensor for detecting the rotational speed of the engine;
An outside air temperature sensor for detecting the outside air temperature of the construction machine;
A noise level indication dial for setting the noise level;
Based on the noise value set by the noise value indication dial and the detection value from each sensor, the engine speed and the load of the main hydraulic pump that enable the maximum work within the range of the noise value setting And a controller for controlling the engine speed and the discharge capacity of the main hydraulic pump according to the calculated value. A construction machine noise control device for controlling construction machine noise,
Engine,
A variable displacement main hydraulic pump that is rotated by the engine and serves as a drive hydraulic source of an actuator in the construction machine;
A variable capacity fan control hydraulic pump that is rotated by the engine and serves as a drive hydraulic source of a fan rotation hydraulic motor that drives a cooling fan that cools hydraulic oil, cooling water, and compressed air in the construction machine;
An oil temperature sensor for detecting the temperature of the hydraulic oil of the main hydraulic pump;
A cooling water temperature sensor for detecting a temperature of cooling water supplied to the cooling system of the engine;
A compressed air temperature sensor for detecting the temperature of the compressed air supplied to the intake system of the engine;
A rotational speed sensor for detecting the rotational speed of the engine;
A rotational speed sensor for detecting the rotational speed of the cooling fan;
An outside air temperature sensor for detecting the outside air temperature of the construction machine;
A noise level indication dial for setting the noise level;
Based on the noise value set by the noise value indication dial and the detection value from each sensor, the engine speed, the cooling fan speed and the main that enable the maximum work within the range of the noise value setting. A construction machine comprising: a controller for calculating a load of a hydraulic pump, and a controller for controlling an engine speed, a discharge capacity of a fan control hydraulic pump, and a discharge capacity of a main hydraulic pump based on the calculated value Noise control device. The noise control device for a construction machine according to claim 2 ,
The controller includes a combination data of an engine speed corresponding to an outside air temperature and a cooling fan speed based on a noise value generated from the entire construction machine, and a hydraulic oil of the main hydraulic pump and a cooling system of the engine A storage unit storing each management temperature value of the cooling fluid composed of cooling water supplied to the engine and compressed air supplied to the intake system of the engine;
From the combination of the engine speed stored in the storage unit and the cooling fan speed, on the condition that the noise setting value input from the noise value indication dial and the outside temperature detected by the outside temperature sensor, A first procedure for calculating the required engine and cooling fan speed;
A second procedure for comparing whether or not the temperature of each cooling fluid is lower than the management temperature value of each cooling fluid stored in the storage unit;
When it is determined that the temperature detection value of each cooling fluid is lower than the management temperature value of each cooling fluid by the second procedure, the engine speed and the cooling fan rotation speed calculated in the first procedure are limited. As a signal, a third procedure for controlling the engine, the main hydraulic pump, and the fan control hydraulic pump,
When it is determined by the second procedure that the detected temperature value of each cooling fluid is higher than the management temperature value of each cooling fluid, the engine speed and the cooling fan speed calculated in the first procedure are corrected. A noise control device for a construction machine, comprising: a calculation unit that adds a value and performs a fourth procedure for controlling the engine, the main hydraulic pump, and the fan control hydraulic pump as a limiting signal. The noise control device for a construction machine according to claim 3,
The storage unit of the controller further stores a different correction value for each type of the cooling fluid that exceeds the management temperature value,
In the fourth procedure, when the calculation unit determines that the temperature detection value of each cooling fluid is higher than the management temperature value of each cooling fluid, for each type of cooling fluid that exceeds the management temperature value Different correction values are read out from the storage unit, and this correction value is added to the engine speed and the cooling fan speed calculated in the first procedure, and is used as a limiting signal for engine, main hydraulic pump and fan control respectively A construction machine noise control device characterized by controlling a hydraulic pump.

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