JP5583150B2 - Cold region work machine - Google Patents

Description

  The present invention relates to a cold region specification working machine used in a cryogenic region, and more particularly, to a configuration of a preheating control device that preheats an engine, a power transmission mechanism, a hydraulic pump, and the like before starting work.

  Construction machines and work machines such as hydraulic excavators, wheel loaders, dump trucks, etc. (in this specification, these are collectively referred to as “work machines”), and extremely low temperature areas where the minimum temperature reaches -30 ° C. or lower. In the cold region specification machine used in the factory, the lubricating oil and hydraulic oil are cooled and the friction is increased, so that it is not possible to smoothly start the engine and operate the hydraulic pump at the start of work. For this reason, the cold district working machine is provided with a preheating device that preheats the engine, the power transmission mechanism, the hydraulic pump, and the like before the start of work so that the work can be smoothly started at the scheduled start time (for example, , See Patent Document 1).

  The technology described in Patent Document 1 uses a hot air generator equipped with a duct as a preheating device, and detachably connects the duct provided in the hot air generator to a duct connecting portion provided at the rear part of the vehicle body of the work machine. The oil pan of the engine is preheated by hot air injected from the hot air generator. Although not disclosed in Patent Document 1, a timer is provided in the preheating device, and the preheating device is automatically activated by starting the preheating device at a time set by the operator of the working machine. What was done is also known. When the preheating device is provided with a timer, the work machine can be preheated automatically, so that the operator of the work machine does not need to manually preheat the oil pan, and the burden on the operator can be reduced.

Japanese Patent No. 4544822

  However, the time required for preheating varies depending on, for example, the temperature on the day before the work day, the time from the previous work end time to the work start time on the work day, etc. When the calculated preheating start time is set in the timer, the work machine is likely to be overheated or deficient in preheating. If the preheating is insufficient, the work machine cannot be started smoothly, and workability is reduced. If the preheating is excessive, the fuel burned by the hot air generator is wasted.

  The present invention has been made in view of the actual situation of the prior art, and is to provide a cold region specification work machine equipped with a preheating control device capable of performing preheating of the work machine without excess or deficiency. .

  In order to solve the above problems, the present invention provides an engine, a hydraulic pump driven by the engine, a hydraulic circuit connected to the hydraulic pump, and a required portion of the engine, the hydraulic pump, and the hydraulic circuit. A preheating heater that preheats before starting the engine, a temperature sensor that detects outside air temperature data or intake air temperature data, and temperature data of each part of the vehicle body, an input means that inputs a scheduled work start time on the work day, and the temperature sensor detects In the work machine comprising a controller that takes in the temperature data and the time data input to the input means and outputs a start-up signal of the preheating heater at a required time prior to the time input to the input means Is the temperature data of each part of the vehicle body at the time of the last engine stop detected by the temperature sensor and the outside air temperature data on the day before the work. Is used to raise the temperature of the engine to a temperature at which the engine can be started using the preheater heater, based on the intake air temperature data and the time from the last engine stop time to the scheduled work start time input on the input day. A necessary preheating time is calculated, and the start-up signal is output to the preheating heater at a time earlier than the time of starting the engine on the day of work by the preheating time.

  The temperature of each part of the vehicle body gradually decreases with the passage of time since the engine stops, and the degree of the temperature decrease increases as the outside air temperature or the intake air temperature decreases. Moreover, the change of the degree of the temperature fall with progress of time can be calculated | required by experiment or simulation. Therefore, if the temperature of each part of the vehicle body when the engine is stopped, the elapsed time since the engine was stopped, and the outside air temperature or intake air temperature on the day before the work are combined, the temperature of each part of the vehicle body at the scheduled work start time on the work day can be accurately predicted. it can. On the other hand, the temperature of each part of the vehicle body gradually rises as time elapses after the preheater is started, and the time required for the temperature of each part of the vehicle body to reach a predetermined temperature at which the engine can be started is The lower the predicted value of the temperature of each part of the vehicle body at the scheduled work start time on that day, and the lower the outside air temperature or intake air temperature on the day before the work, the longer it is. Further, the preheating time by the preheating heater until the temperature of each part of the vehicle body reaches a predetermined temperature at which the engine can be started can be obtained by experiment or simulation. Therefore, if the predicted values of the temperature of each part of the vehicle body at the scheduled engine start time on the day of work and the outside air temperature or intake air temperature on the day before the work are combined, the preheating until the temperature of each part of the vehicle body reaches a predetermined temperature at which the engine can be started. The preheating time by the heater can be accurately calculated. As described above, when the temperature of each part of the vehicle body at the scheduled work start time on the work day is predicted based on the temperature of each part of the vehicle body when the engine is stopped, the elapsed time since the engine was stopped, and the outside air temperature or intake air temperature on the day before the work, Based on the temperature of each part of the car body at the scheduled work start time on the day of work and the outside air temperature or intake air temperature on the day before the work, the preheating time by the preheater heater until the temperature of each part of the car body reaches a predetermined temperature at which the engine can be started is accurately determined. Therefore, it is possible to preheat the work machine without excess or deficiency.

  Further, the present invention provides the cold region working machine having the above-described configuration, wherein the controller includes temperature data of each part of the vehicle body at the time of the last engine stop detected by the temperature sensor, outside air temperature data or intake air temperature data on the day before work. , The temperature drop data of each part of the vehicle body corresponding to the elapsed time from the last engine stop time is stored in the storage unit, the temperature data of each part of the vehicle body taken from the temperature sensor, the outside air temperature data on the day before work, or Based on the intake air temperature data and the time from the last engine stop time to the scheduled work start time of the work day input to the input means, the work start schedule for the work day is determined from the temperature decrease data stored in the storage unit. The temperature of each part of the vehicle body at the time is predicted, and the predicted temperature of each part of the vehicle body and the outside air temperature data or the day before work detected by the temperature sensor. The temperature rise data of each part of the vehicle body corresponding to the intake air temperature data and the operating time of the preheat heater is stored in the storage unit, and the predicted temperature of each part of the vehicle body and the outside temperature on the day before work detected by the temperature sensor The engine is started from the temperature rise data stored in the storage unit based on data or intake air temperature data and the difference between the predicted temperature of each part of the vehicle body and the temperature of each part of the vehicle body capable of starting the engine. The preheating time of the preheating heater necessary for raising the temperature to a possible temperature is calculated.

  As described above, each part of the vehicle body according to the temperature data of each part of the vehicle body detected by the temperature sensor at the time of the last engine stop, the outside air temperature data or intake air temperature data on the day before the work, and the elapsed time from the last engine stop time The temperature drop data can be obtained by experiment or simulation. Further, the temperature rise data of each part of the vehicle body corresponding to the predicted temperature of each part of the vehicle body, the outside air temperature data or intake air temperature data on the day before the work detected by the temperature sensor, and the operating time of the preheating heater are also obtained by experiment or simulation. be able to. If these temperature drop data and temperature rise data are stored in the storage unit, the temperature data of each part of the vehicle body at the time of the last engine stop detected by the temperature sensor, the outside air temperature data or intake air temperature data on the day before the work, and the last It is possible to easily predict the temperature of each part of the vehicle body at the scheduled work start time on the work day based on the temperature drop data stored in the storage unit from the time from the engine stop time to the scheduled work start time on the work day. it can. Further, the temperature rise data stored in the storage unit is calculated from the predicted temperature of each part of the vehicle body, the outside air temperature data or intake air temperature data of the day before work detected by the temperature sensor, and the temperature of each part of the vehicle body that can start the engine. Based on this, it is possible to calculate the preheating time of the preheating heater necessary for raising the temperature to a temperature at which the engine can be easily started. Therefore, the burden on the controller can be reduced, and the start-up of the preheating heater can be easily and accurately performed.

  Further, according to the present invention, in the cold region working machine having the above-described configuration, temperature data of cooling water for cooling the engine, temperature data of fuel combusted in the engine, and lubrication of the engine are performed using the temperature sensor. Detecting at least one temperature data selected from temperature data of lubricating oil and temperature data of hydraulic oil circulating in the hydraulic piping, and using the preheating heater, the cooling water from which the temperature data is detected, At least one of the fuel, the lubricating oil, and the hydraulic oil is preheated.

  Engine cooling water temperature data, engine fuel temperature data, and engine lubricating oil temperature data are indicators of whether or not the engine can be started, and hydraulic oil temperature data is an indicator of whether or not the hydraulic pump can be operated. It becomes. That is, when each of these temperature data is lower than a predetermined value, it is not possible to smoothly start the engine and operate the hydraulic pump. Therefore, when these temperature data are lower than a predetermined value, if the required part is preheated using a preheating heater, the engine and / or the hydraulic pump can be smoothly started at the scheduled work start time on the work day. Can do.

  Further, the present invention provides a cold region working machine having the above-described configuration, using the temperature sensor, cooling water for cooling the engine, fuel burned in the engine, lubricating oil for lubricating the engine, and hydraulic pressure From the hydraulic oil circulating in the pipe, the temperature data of the portion that has the greatest influence on the startability of the engine is detected, and the portion that has the greatest influence on the startability of the engine is detected using the preheating heater. It is characterized by preheating.

  The part that has the greatest influence on the startability of the engine differs depending on the engine model. Therefore, when the temperature data of the part that has the greatest influence on the startability of the engine is detected by the temperature sensor, and the part is preheated preferentially by the preheating heater based on the temperature data of the part, the most efficient The engine can be easily started. The part that has the greatest influence on the startability of the engine can be known by experiments and simulations.

  The present invention is based on the temperature data of each part of the vehicle body at the time of the last engine stop, the outside air temperature data or intake air temperature data of the previous day, and the time from the last engine stop time to the scheduled work start time on the work day. The temperature of each part of the vehicle body at the scheduled start time is predicted, and the temperature is raised to a temperature at which the engine can be started using the preheater heater from the predicted temperature of each part of the vehicle body and the outside air temperature data or intake air temperature data on the day before the work. Since the preheating time required for the vehicle is calculated, the preheating time by the preheating heater until the temperature of each part of the vehicle body reaches a predetermined temperature at which the engine can be started can be accurately calculated, and the preheating of the work machine can be performed without excess or deficiency. .

1 is a side view of a hydraulic excavator according to an embodiment. It is AA sectional drawing of FIG. It is a block diagram of the preheating control apparatus which concerns on embodiment. It is a graph which shows the temperature fall data memorize | stored in a controller. It is a graph which shows the temperature rise data memorize | stored in a controller. It is a flowchart which shows operation | movement of the preheating control apparatus which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a cold region working machine according to the present invention will be described with reference to the drawings. The present invention is applied to all cold region specification work machines having a hydraulic pump driven by an engine, such as a hydraulic excavator, a wheel loader, a dump truck, and a bulldozer, and driving a hydraulic actuator by pressure oil discharged from the hydraulic pump. In the following description, a hydraulic excavator will be described as an example.

  As shown in FIG. 1, the hydraulic excavator according to the embodiment is provided on a lower traveling body 1 driven to travel by a traveling hydraulic motor (not shown) and on the upper portion of the lower traveling body 1 so as to be capable of turning via a turning device 2a. The upper swing body 2 is driven to swing by a swing hydraulic motor (not shown), and the front working mechanism 3 provided in the upper swing body 2 is mainly configured. In addition, in the example of FIG. 1, although the crawler is used as the lower traveling body 1, it can replace with this and a tire can also be used.

  The upper swing body 2 is provided with a cab 5 including a driver's seat 4 on the front side thereof, and a required operating device is provided around the driver's seat 4 in the cab 5. A counterweight 6 is provided at the rear end portion of the upper swing body 2, and a machine chamber 7 in which an engine, a hydraulic pump, and the like are accommodated is provided at a front portion of the counterweight 6.

  The front working mechanism 3 includes a boom 11 having one end rotatably connected to the upper swing body 2, a boom hydraulic cylinder 12 that drives the boom 11 up and down, and an arm having one end rotatably connected to the boom 11. 13, an arm hydraulic cylinder 14 for driving the arm 13 up and down, a bucket 15 whose one end is rotatably connected to the arm 13, and a bucket hydraulic cylinder 16 for driving the bucket 15 up and down. In addition, it can replace with the bucket 15 and can also attach other attachments, such as a crusher or a grappler.

  As shown in FIG. 2, an engine 21, a radiator 22 for cooling the engine 21, and a hydraulic pump 23 driven by the engine 21 are accommodated in the machine room 7. An outside air temperature detection sensor 24 for detecting the outside air temperature is provided on the outer surface of the machine room 7, and an intake air temperature detection sensor 26 for detecting the intake air temperature is provided at the intake port 25 of the engine 21. Is provided. Note that one of the outside air temperature detection sensor 24 and the intake air temperature detection sensor 26 can be omitted.

  The engine 21 and the radiator 22 are connected via a cooling water hose 27. A part of the cooling water circulation path constituted by the engine 21, the radiator 22 and the cooling water hose 27 has a temperature of the engine cooling water. A cooling water temperature detection sensor 28 for detection is provided. An oil pan 29 that accumulates the lubricating oil of the engine 21 is provided below the engine 21, and the oil pan 29 is provided with a lubricating oil temperature detection sensor 30 that detects the temperature of the engine lubricating oil. A fuel tank 33 is connected to a fuel injection device 31 provided in the engine 21 via a fuel pipe 32, and a part of a fuel supply path from the fuel tank 33 to the fuel injection device 31 has engine fuel. A fuel temperature detection sensor 34 for detecting the temperature is provided. Further, a hydraulic oil tank 36 is connected to the suction port of the hydraulic pump 23 via a suction pipe 35, and the traveling hydraulic motor and the turning hydraulic motor described above are connected to the discharge port of the hydraulic pump 23 via a discharge pipe 37. The boom hydraulic cylinder 12, the arm hydraulic cylinder 14, and the bucket hydraulic cylinder 16 are connected, and a part of the hydraulic oil circulation path from the hydraulic oil tank 36 to each of the hydraulic actuators described above is provided with hydraulic oil. A hydraulic oil temperature detection sensor 38 for detecting the temperature is provided. In addition, the temperature sensor to be used is not limited to the above-mentioned one, and can be appropriately disposed or added as necessary.

  In the machine room 7, an engine 21, a radiator 22, a hydraulic pump 23, a cooling water hose 27, an oil pan 29, a fuel injection device 31, a fuel pipe 32, a fuel tank 33, a suction pipe 35, a hydraulic oil tank 36, and A preheating heater 39 for preheating a required portion selected from the discharge pipe 37 is provided. As the preheating heater 39, in addition to an electric preheating heater, a combination of a combustion burner and a blower can be used. For cost reduction, it is desirable to use a general-purpose product such as a bust preheating heater. In FIG. 2, only one preheating heater 39 is provided, but a plurality of preheating heaters 39 may be provided as necessary.

  FIG. 3 shows the configuration of a preheating control device that controls the start of starting the preheating heater 39. As is apparent from this figure, the preheating control device of this example includes the above-described temperature sensors 24, 26, 28, 30, 34, and 38, and an input means 41 such as a numeric keypad for inputting the scheduled work start time on the work day. A preheating heater 39, a power supply device 42 such as a battery for supplying power to the preheating heater 39, a power switch 43 provided with an electric circuit for connecting the preheating heater 39 and the power supply device 42, and the temperature sensors 24. , 26, 28, 30, 34, and 38 and the time data input to the input means 41 are captured, a start signal is output at a predetermined timing, and the power switch 43 is switched to a conductive state, and the preheater heater The controller 44 supplies the power of the power supply device 42 to the power source 39.

  Hereinafter, in order to facilitate the explanation, a preheat heater arranged so that the temperature of the engine lubricating oil stored in the oil pan 29 can be detected by the lubricating oil temperature detection sensor 30 and the oil pan 20 can be heated. The configuration and operation of the preheating control device according to the embodiment will be described by taking as an example the case where the oil pan 29 is preheated using 39.

In the storage unit of the controller 44, as shown in FIG. 4, the temperature T ₂ of the oil pan 29 at the time of the last engine stop detected by the lubricating oil temperature detection sensor 30, the day before work detected by the outside air temperature detection sensor 24, The temperature drop data T ₂ (t) of the oil pan 29 according to the ambient temperature data or the intake air temperature T _{1 on the} day before work detected by the intake air temperature detection sensor 26 and the elapsed time from the last engine stop time t ₂ ; and work disclosure scheduled time t ₃ of the day the work that has been input to the input means 41 are stored. The temperature decrease data T ₂ (t) in FIG. 4 can be obtained by experiment or simulation. The storage unit of the controller 44, as shown in FIG. 5, the temperature of the oil pan 29 in the work disclosed expected time t ₃ of the day work to be predicted by using a temperature reduction data T ₂ of the FIG. 4 _(t) T ₃ , the outside air temperature data detected on the day before work detected by the outside air temperature detection sensor 24, or the intake air temperature T _{1 on the} day before work detected by the intake air temperature detection sensor 26, and the operating time of the preheat heater 39 Temperature rise data T ₃ (t) and the temperature Ts of the oil pan 29 at which the engine 21 can be started are stored. The temperature rise data T ₃ (t) shown in FIG. 5 can also be obtained by experiment or simulation.

The operator of the work machine normally performs a required work using the work machine from a predetermined work start time t ₀ to a work end time t ₁ (step S11), and a predetermined work end time t ₁ comes. And the work is finished (step S12). Between the predetermined work start time t ₀ and the work end time t ₁ , the engine 21 may be stopped due to work convenience or rest time, but the engine 21 is finally stopped when the work ends. This is when the time t ₁ comes and the work is actually finished (t = t ₂ ). The controller 44 detects the temperature T ₂ of the lubricating oil in the oil pan 29 at the actual work end time t ₂ detected by the lubricating oil temperature detection sensor 30 and the outside air temperature or intake air temperature detected by the outside air temperature detecting sensor 24. storing intake air temperature T ₁ detected by the sensor 26.

After the end of work, the operator operates the input means 41 to input the operation start scheduled time t ₃ of the next day or the next working day (step S1). Controller 44, the next day or the work scheduled start time t ₃ of the next working day is input, the outside air temperature or intake air temperature T _1, which is stored in the storage unit, the actual in the oil pan 29 in the working end time t ₂ the reference to the temperature T ₂ of the lubricating oil (step S2), and based on the temperature drop data shown in FIG. 4, the temperature T ₃ of the engine lubricating oil in the working scheduled start time t ₃ of the next day or the next working day Prediction is made (step S3). Next, the controller 44, based on the temperature rise data shown in FIG. 5, the required temperature T ₂ of the lubricant oil in the oil pan 29 reaches a predetermined temperature Ts capable start the engine 21, the storage unit preheating calculates the time t _R corresponding to the stored ambient temperature or intake air temperature T ₁ (step S4). Then, the controller 44 sets a preheating start time at a time (t = t ₃ −t _R ) that is a preheating time t _R before the scheduled work start time t _3, and a preheating start signal is sent to the power switch 43 at the preheating start time. Is output. As a result, the power switch 43 is switched to the conductive state, the electric power of the power supply device 42 is supplied to the preheating heater 39, and the temperature of the lubricating oil in the oil pan 29 is increased (step S5). After the start of the preheating, and reaches the operation start scheduled time t _3, the preheating stop signal is outputted to the power switch 43 from the controller 44, preheater 39 is stopped (step S6).

  The work machine according to the present embodiment starts work on the day of work from the temperature data of the lubricating oil in the oil pan 29 at the time of the last engine stop, the outside air temperature data or intake air temperature data on the day before the work, and the last engine stop time. The temperature of each part of the vehicle body at the scheduled work start time on the work day is predicted from the time until the scheduled time, the temperature of the lubricating oil in the oil pan 29 at the predicted work disclosure scheduled time on the work day, and the day before the work Since the preheating time required to raise the temperature of the engine 21 to a temperature at which the engine 21 can be started is calculated from the temperature data or the intake air temperature data using the preheating heater 39, the temperature of the lubricating oil in the oil pan 29 starts the engine 21. The preheating time by the preheating heater 39 until it reaches a possible predetermined temperature can be accurately calculated, and the work machine can be preheated without excess or deficiency. Therefore, it is possible to avoid a reduction in work efficiency due to insufficient preheating and waste of electric power due to excessive preheating.

  In the above embodiment, the temperature of the lubricating oil in the oil pan 29 is detected and the oil pan 29 is preheated using the preheater heater 39, but the gist of the present invention is not limited to this. In addition, the temperature data of the cooling water for cooling the engine 21, the temperature data of the fuel combusted in the engine 21, or the temperature data of the hydraulic oil circulating in the hydraulic pipes 35 and 37 are detected, and the preheater heater 39 is set. It can also be set as the structure which preheats any one of cooling water, fuel, and lubricating oil hydraulic fluid. Alternatively, a plurality of temperature data selected from the above-described temperature data may be detected, and a plurality of parts of each part of the vehicle body may be preheated using a plurality of preheating heaters 39. Thereby, it is possible to smoothly start the engine and / or operate the hydraulic pump at the scheduled work start time.

  Of the cooling water that cools the engine 21, the fuel that is burned in the engine 21, the lubricating oil that lubricates the 21 engine, and the hydraulic oil that circulates through the hydraulic pipes 35 and 37, the engine 21 has the most influence on the startability. The temperature data of the part can be detected, and the preheating heater 39 can be used to preheat the part that most affects the startability of the engine 21. The part that most affects the startability of the engine 21 can be obtained by experiments and simulations, and the engine 21 can be started most efficiently by preheating the part with priority using the preheater 39. it can.

  INDUSTRIAL APPLICABILITY The present invention is a working machine such as a hydraulic excavator, a wheel loader, and a dump truck, and can be used for a cold region specification working machine used in a cryogenic region where the minimum temperature reaches -30 ° C. or less.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 2a Turning apparatus 3 Front work mechanism 4 Driver's seat 5 Cab 6 Counterweight 7 Machine room 11 Boom 12 Boom hydraulic cylinder 13 Arm 14 Arm hydraulic cylinder 15 Bucket 16 Bucket hydraulic cylinder 21 Engine 22 Radiator 23 Hydraulic pump 24 Outside air temperature detection sensor 25 Engine intake port 26 Intake air temperature detection sensor 27 Cooling water hose 28 Cooling water temperature detection sensor 29 Oil pan 30 Lubricating oil temperature detection sensor 31 Fuel injection device 32 Fuel piping 33 Fuel tank 34 Fuel Temperature detection sensor 35 Suction piping 36 Hydraulic oil tank 37 Discharge piping 38 Hydraulic oil temperature detection sensor 39 Preheating heater 41 Input means 42 Power supply device 43 Power switch 44 Controller

Claims (4)

An engine, a hydraulic pump driven by the engine, a hydraulic circuit connected to the hydraulic pump, a preheating heater for preheating the engine, the hydraulic pump, and a required portion of the hydraulic circuit before starting the engine, A temperature sensor for detecting outside air temperature data or intake air temperature data and temperature data of each part of the vehicle body, input means for inputting a scheduled work start time on the day of work, temperature data detected by the temperature sensor, and input to the input means In a work machine including a controller that takes in time data and outputs a start start signal of the preheating heater at a required time prior to the time input to the input means.
The controller includes the temperature data of each part of the vehicle body at the time of the last engine stop detected by the temperature sensor, the outside air temperature data or intake air temperature data on the day before the work, and the work day input to the input means from the last engine stop time. From the time until the scheduled work start time, a preheat time required to raise the temperature of the engine to a temperature at which the engine can be started using the preheater is calculated, and the preheat time is higher than the time when the engine is started on the work day. A cold region specification work machine characterized in that the start-up signal is output to the preheating heater at a time earlier by time. The controller includes the temperature data of each part of the vehicle body at the time of the last engine stop detected by the temperature sensor, the outside air temperature data or intake air temperature data on the day before the work, and the elapsed time from the last engine stop time. Is stored in the storage unit, and is input to the input means from the temperature data of each part of the vehicle body taken from the temperature sensor, the outside air temperature data or intake air temperature data on the day before work, and the last engine stop time. Based on the time until the scheduled work start time on the work day, from the temperature drop data stored in the storage unit, predict the temperature of each part of the vehicle body at the scheduled work start time on the work day,
The storage unit stores temperature predicted data of each part of the vehicle body, outside temperature data or intake air temperature data on the day before work detected by the temperature sensor, and temperature rise data of each part of the vehicle body according to the operating time of the preheating heater. And the predicted temperature of each part of the vehicle body, the outside air temperature data or intake air temperature data on the day before work detected by the temperature sensor, and the predicted temperature of each part of the vehicle body and the temperature of each part of the vehicle body capable of starting the engine. The preheating time of the preheating heater required to raise the temperature to a temperature at which the engine can be started is calculated from the temperature increase data stored in the storage unit based on the difference between the preheating heater and the preheating time. Cold region specification work machine as described in 1.   Using the temperature sensor, temperature data of cooling water for cooling the engine, temperature data of fuel combusted in the engine, temperature data of lubricating oil for lubricating the engine, and hydraulic oil circulating in the hydraulic piping At least one temperature data selected from temperature data is detected, and at least one of the cooling water, the fuel, the lubricating oil, and the hydraulic oil from which the temperature data is detected using the preheating heater. The work machine of the cold district specification according to any one of claims 1 and 2, wherein the work machine is preheated.   Using the temperature sensor, the engine can be started from cooling water that cools the engine, fuel burned in the engine, lubricating oil that lubricates the engine, and hydraulic oil that circulates through the hydraulic piping. 3. The temperature data of a portion having the greatest influence is detected, and the portion having the largest influence on the startability of the engine is preheated by using the preheating heater. A cold region working machine according to item 1.

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