JP6539440B2 - Engine start control device for hybrid working machine - Google Patents

Description

The present invention relates to an engine start control equipment for a hybrid working machine.

  In the past, work machines such as hydraulic shovels and the like were mainly equipped with a hydraulic pump driven by an engine and a hydraulic actuator driven by pressure oil discharged by the hydraulic pump. In order to reduce the level and the amount of exhaust gas, etc., a hybrid working machine including an electric actuator driven by receiving supply of electric energy from the storage device and a generator motor assisting the drive of the engine and hydraulic pump Has been proposed.

  In such a hybrid working machine, a main pump driven by an engine is used as a drive source for the purpose of providing a parallel type drive device in which a gear box is not interposed between an engine and a hydraulic pump and a generator motor. A driving device of a parallel hybrid construction machine (work machine) that can be driven by two drive systems of a drive for a hydraulic actuator and a drive of a swivel base driven by a generator / motor, which is a crank of an engine There is one in which the main pump and the generator / motor are arranged coaxially on the one side of the shaft via a coupling in this order (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2007-218003

  By the way, the starter is used for starting the engine in the conventional working machine. Engine starting using a starter is started by meshing the pinion gear of the starter with the ring gear on the outer peripheral part of the flywheel attached to the engine crankshaft, thereby reducing the number of rotations of the starter and generating high torque. , Crank the engine.

  The engine is designed such that stable combustion can not be obtained unless the number of revolutions rises to the minimum revolution number or more within the steady-state operable range. For this reason, during engine startup, torque fluctuation due to incomplete combustion occurs during the period from the stop state of the crankshaft to the steady-state operable range, so that a large vibration occurs. From the viewpoint of reducing stress on the operator, it is desirable to shorten the time to reach the steady-state operable range as much as possible.

  In the hybrid work machine described in Patent Document 1 described above, the generator / motor can be used to start the engine. Since the generator / motor does not have a reduction mechanism, the engine can reach within the steady-state operable range in a short time as compared with the starter. Moreover, since the noise is smaller than that of the starter, the stress given to the operator can be reduced.

  However, in a low temperature environment, the viscosity of the engine oil and the hydraulic oil increases and the performance of the storage device for driving the generator / motor decreases, so that the torque is insufficient during cranking of the engine by the generator / motor May occur.

The present invention has been made based on the above matters, and an object, even in a low temperature environment of, in a short time hybrid type working machine engine start control equipment that can be reached until the rotation speed of the normal operation range It is to provide.

In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems, and an example thereof is an engine, a hydraulic pump driven by the engine, and a ring gear connected to the engine, the engine A starter for starting, a generator motor coaxially connected to the crankshaft of the engine, a power storage device for transferring power between the generator motor, a key switch, and a start signal from the key switch An engine start control device for a hybrid working machine, comprising: a vehicle controller to which is input, an outside air temperature determination means for determining an outside air temperature in an operating area, and a calculation unit for calculating an SOC indicating a charge state of the power storage device The vehicle controller starts the engine when the SOC calculated by the calculation unit is less than or equal to a predetermined SOC threshold. The start signal is output to the starter for, SOC calculated by the calculation unit exceeds the predetermined SOC threshold and the outside air temperature determination means outside air temperature operating region is determined by the predetermined temperature threshold If it exceeds the outputs a start signal for starting the engine to the generator motor, SOC calculated by the calculation unit exceeds the predetermined SOC threshold value, and, by the outside air temperature determination means When the outside air temperature of the determined operation area is less than the predetermined temperature threshold, a start signal for starting the engine is output to the starter, and after a predetermined time has elapsed after the output, the engine is started Outputting a start signal to the generator motor.

  According to the present invention, since the starter and the generator motor are properly used according to the outside air temperature to start the engine, it is possible to reach the rotation speed within the steady-state operable range in a short time. As a result, since the engine can be started without giving a stress to the operator, the workability is improved.

FIG. 1 is a side view showing a hybrid working machine provided with a first embodiment of an engine start control device for a hybrid working machine of the present invention. FIG. 1 is a plan view showing an arrangement of equipment on a rotating body in a hybrid working machine provided with a first embodiment of an engine start control device for a hybrid working machine according to the present invention. It is a control block diagram showing composition of a 1st embodiment of an engine starting control device of a hybrid type work machine of the present invention. It is a flowchart figure which shows the processing content of the control of 1st Embodiment of the engine starting control apparatus of the hybrid type working machine of this invention. It is a characteristic view explaining an example of engine starting in a 1st embodiment of an engine starting control device of a hybrid type work machine of the present invention. It is a characteristic view explaining other examples of engine starting in a 1st embodiment of an engine starting control device of a hybrid type work machine of the present invention. It is a characteristic view explaining the further another example of engine starting in a 1st embodiment of the engine starting control device of the hybrid type work machine of the present invention. It is a control block diagram showing the composition of a 2nd embodiment of the engine starting control device of the hybrid type working machine of the present invention. It is a table figure showing an example of monthly average lowest temperature memorized by storage of a 2nd embodiment of an engine starting control device of a hybrid type work machine of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking a crawler type hybrid hydraulic shovel as an example of a working machine. The application of the present invention is not limited to hydraulic excavators.

  FIG. 1 is a side view showing a hybrid working machine provided with a first embodiment of an engine start control device for a hybrid working machine according to the present invention, and FIG. 2 is an engine starting control system for a hybrid working machine according to the present invention. It is a top view which shows the apparatus arrangement form on the turning body in the hybrid type working machine provided with 1st Embodiment.

  In FIG. 1 and FIG. 2, the crawler type hybrid hydraulic shovel 1 includes a traveling body 100, a swing body 10 rotatably provided on the top of the traveling body 100, and a work device 90 attached to a front end portion of the swing body 10. Is equipped.

  The traveling body 100 includes a pair of left and right crawlers, and the left crawler shown in FIG. 1 is driven by the left traveling hydraulic motor 14.

  The revolving unit 10 has a main frame 11 which is a support structure extending in the front, rear, left, and right of the vehicle body in which a plurality of steel plates and steel members are joined, and is mounted on the front left side of the main frame 11 A counterweight 40 provided at the rear end of the main frame 11 to adjust the weight balance with the work apparatus 90, and equipment such as the engine 61 and the radiator 71 mounted on the main frame 11 A building cover 50 for partitioning, and a space formed by being covered by the building cover 50 in front of the counterweight 40 behind the main frame 11, and accommodating the engine 61, the hydraulic pump 62, the assist power generation motor 63, etc. A space similarly formed in front of the engine room 60 and the counterweight 40 adjacent to the engine room 60 A radiator room 70 for storing the electric storage device 71 and the storage device 72, and a space similarly formed behind the cab 30 and in front of the radiator room 70, in which a power control unit (hereinafter referred to as PCU) 81 is stored. A utility room 80 is provided.

  The work device 90 includes a boom 91 attached to the swing body 10 so as to be able to ascend and descend, an arm 92 that is ascendably mounted to the tip of the boom 91, a bucket 93 that ascendably attached to the tip of the arm 92, and a boom A boom cylinder 95 for operating 91, an arm cylinder 96 for operating the arm 92, and a bucket cylinder 97 for operating the bucket 93 are provided.

  On the main frame 11, a hydraulic system including the swing hydraulic motor 12, the control valve 13, the hydraulic pump 62, and the hydraulic oil tank 66 shown in FIG. 2 is mounted. The hydraulic system includes an engine 61, a hydraulic pump 62 driven by the engine 61, and a swing hydraulic motor 12 driven by hydraulic fluid discharged from the hydraulic pump 62, a left traveling hydraulic motor 14, a boom cylinder 95, an arm cylinder 96. And a control valve 13 that switches the amount and direction of supply of hydraulic fluid supplied to the respective hydraulic actuators based on a command from a control lever (not shown).

  A key switch 32 (see FIG. 3) for starting the vehicle body, an operation lever (not shown) for operating the work device 90, a vehicle controller 34, a storage device 36, etc. It is done. In addition, a global positioning system (hereinafter referred to as GPS) receiving device 37 is provided above the outside of the cab 30. Further, a cooling water temperature sensor 67 for detecting the temperature of the cooling water of the engine 61 is disposed on the side surface of the casing of the engine 61, and a hydraulic oil temperature sensor 68 for detecting the temperature of the hydraulic oil is disposed below the hydraulic oil tank 66. It is arranged. Temperature signals detected by these temperature sensors are input to the vehicle controller 34.

  Next, the system configuration of the first embodiment of the engine start control device for a hybrid work machine of the present invention will be described using FIG. FIG. 3 is a control block diagram showing the configuration of the first embodiment of the engine start control device for a hybrid work machine of the present invention. In FIG. 3, the same reference numerals as those shown in FIGS. 1 and 2 denote the same parts, so the detailed description thereof will be omitted.

  The engine start control device according to the present embodiment supplies power to an engine 61, a hydraulic pump 62, an assist power generation motor 63 as a generator motor, a starter 64 for cranking and starting the engine 61, and a starter 64. A lead battery 65, a PCU 81, a power storage device 72 for supplying power to the PCU 81, a vehicle controller 34, an outside air temperature sensor 73, and a key switch 32 are provided.

  A starter 64 is connected to the engine 61 via a ring gear of an outer peripheral portion of a flywheel attached to a crankshaft.

  The assist power generation motor 63 as a generator motor is a motor generator connected by the same drive shaft (crankshaft) as the engine 61 and the hydraulic pump 62, receives a command from the vehicle controller 34, and is connected to the power storage device 72. It is controlled by the PCU 81.

  PCU 81 includes an inverter for driving assist power generation motor 63 and a control unit therefor. The inverter is provided to arbitrarily control the power generated by the assist power generation motor 63. The inverter converts DC power from the storage device 72 into AC power and supplies it to the assist power generation motor 63 during power running, and converts power from AC power from the assist power generation motor 63 into DC power during regeneration to the power storage device 72. Store electricity.

  Power storage device 72 has an operation unit that detects the voltage or current of each of the constituent cells to calculate SOC (State of charge), and the calculated SOC information is output to vehicle controller 34. .

  In addition to the above-mentioned SOC information, the outside air temperature signal detected by the outside air temperature sensor 73, the start signal from the key switch 32, and the like are input to the vehicle body controller 34, and the starter 64 and / or PCU 81 according to these signals. Output control command to

  In the present embodiment, the engine 61 is started by cranking the drive shaft by the starter 64 and / or the assist power generation motor 63. Further, when the output torque of engine 61 is larger than the required torque of hydraulic pump 62 during normal operation of engine 61, assist power generation motor 63 is driven as a generator with the surplus torque, and the generated power is charged to power storage device 72. Do. Conversely, when the output torque of the engine 61 is smaller than the required torque of the hydraulic pump 62, the assist power generation motor 63 is driven as an electric motor by the electric power charged in the power storage device 72. Assist the drive.

  Next, a method of engine start control in the first embodiment of the engine start control device for a hybrid working machine of the present invention will be described with reference to FIGS. 4 to 7. FIG. 4 is a flow chart showing the process contents of the control of the first embodiment of the engine start control device of the hybrid work machine of the present invention, and FIG. 5 is the first of the engine start control device of the hybrid work machine of the present invention. FIG. 6 is a characteristic diagram illustrating another example of engine starting in the first embodiment of the engine starting control device for a hybrid work machine of the present invention, FIG. 7 is a characteristic diagram for explaining yet another example of engine starting in the first embodiment of the engine starting control device for a hybrid working machine of the present invention. In FIG. 4 to FIG. 7, the same reference numerals as the reference numerals shown in FIG. 1 to FIG. 3 denote the same parts, so the detailed description thereof will be omitted.

  The arithmetic processing in FIG. 4 is mainly executed by the vehicle controller 34. The vehicle controller 34 determines whether there is an engine start command (step S1). Specifically, it is determined whether or not the start signal from the key switch 32 has been input. If there is an engine start command, the process proceeds to (step S2). Otherwise, return processing is performed.

  The vehicle controller 34 determines whether the input SOC exceeds a predetermined threshold value α (step S2). As described above, the SOC is a value indicating the charge state of the power storage device 72, and the threshold value α is set to the value of the minimum SOC of the power storage device 72 that enables the assist power generation motor 63 to be driven. If the SOC exceeds the threshold value α, the process proceeds to (step S3). Otherwise, the process proceeds to (step S4).

The vehicle controller 34 determines whether or not the outside air temperature signal input exceeds the thresholds T ₁ a predetermined (step S3). Here, thresholds T ₁ is an engine startable minimum temperature by only the assist generator motor 63, for example, is set to such -10 ° C.. If the outside air temperature exceeds the thresholds T _1, the process proceeds to the process proceeds to (step S5), and in other cases it (step S6).

When it is determined in step S2 that the SOC is equal to or less than the threshold value α, the vehicle controller 34 outputs a start signal to the starter 64 (step S4). FIG. 5 is a characteristic diagram showing an example of the cranking start of the engine 61 by the starter 64. As shown in FIG. In FIG. 5, the horizontal axis represents time, and the vertical axis represents (a) engine rotation speed, (b) starter start signal, and (c) assist power generation motor start signal. The solid line in (a) shows the speed increase characteristic of the engine speed, and the broken line in (b) shows the ON / OFF property of the starter start signal. The time _{t 0} is the time of the start command ON (key switch 32ON), the time _{t S} respectively show the time of the starter start signal OFF.

When the start command ON at time t _0, after meshed with the starter activation signal as shown in (b) is outputted to the starter 64, the pinion gear of the starter 64 (not shown) (not shown) the ring gear, The torque of the starter 64 is transmitted to the drive shaft of the engine 61, and as shown in (a), the rotational speed of the engine 61 is increased. At time t _S , when the rotational speed of the engine 61 substantially reaches the rated value, the starter activation signal is turned off.

Returning to FIG. 4, in (step S3), and if it is determined that the outside air temperature signal exceeds the threshold value T _1, the vehicle body controller 34 outputs a start signal to the PCU81 for controlling the assist power generating motor 63 (step S5 ). FIG. 6 is a characteristic diagram showing an example of the cranking start of the engine 61 by the assist power generation motor 63. As shown in FIG. In FIG. 6, the horizontal axis and the vertical axis are the same as in FIG. 5, and the broken line in (c) shows the ON / OFF characteristics of the assist power generation motor start signal. The time _{t 0} is the time of the start command ON (key switch 32ON), the time _{t a} indicates the time of the assist power motor start signal OFF, respectively.

When the start command ON at time t _0, the assist power generating motor start signal as shown in (c) is output to PCU81, continue to speed-up the rotational speed of the engine 61 as shown in (a). At time t _a , when the rotational speed of the engine 61 almost reaches the rated value, the assist power generation motor start signal is turned off. Compared with the characteristic of the case of the engine start by the starter 64 shown in FIG. 5, the characteristic of the start by the assist power generation motor 63 can make the rotational speed of the engine 61 reach the steady operation possible range in a short time.

Returning to FIG. 4, in (step S3), and if the outside air temperature signal is determined to be thresholds T ₁ or less, the vehicle controller 34 outputs an activation signal to the PCU81 and the starter 64 to control the assist power generating motor 63 (Step S6). FIG. 7 is a characteristic diagram showing an example of the cranking start of the engine 61 using the assist power generation motor 63 and the starter 64 in combination. In FIG. 7, the horizontal axis and the vertical axis are the same as in FIG. 5, and the broken line in (c) shows the ON / OFF characteristics of the assist power generation motor start signal. The time _{t 0} is the time of the start command ON (key switch 32ON), the time _{t Sa} indicates the time of OFF of the starter activation signal and the assist power motor start signal, respectively.

When the start command ON at time t _0, since the pinion gear (not shown) of the starter 64 to prevent noise and gear defects when meshing with the ring gear, and outputs a start signal to the starter 64 at the beginning as shown in (b). Then the assist generator motor starting signal as shown at time t ₀ a predetermined time from the (Delta] t) elapsed time t ₁ (c) is output to PCU81, the rotational speed of the engine 61 as shown in (a) Speed up. At time t _Sa , when the rotational speed of the engine 61 almost reaches the rated value, the assist power generation motor start signal and the starter start signal are turned off. The predetermined time Δt is determined in consideration of the meshing completion time of the pinion gear and the ring gear.

  Returning to FIG. 4, after one of the processes of (step S4), (step S5) and (step S6) is completed, the vehicle controller 34 performs a return process.

  By performing the above processing, in the present embodiment, it is possible to minimize the time from when the engine is started to when the rotational speed in the steady-state operable range is reached.

  That is, when the SOC of the storage device 72 is sufficient and the low temperature environment is not under, the first engine starting means is selected, and the assist power generation motor 63 alone starts cranking the engine 61. The cranking start of the engine 61 by the assist power generation motor 63 alone can reach the rotation speed in the steady-state operable range from the start of the engine start in a short time. However, when the SOC of the storage device 72 is not sufficient, the assist power generation motor 63 can not be used, so the second engine starting means is selected, and the engine 64 is cranked and started by the starter 64 alone.

  Further, in a low temperature environment, the viscosity of the engine oil and the hydraulic oil is increased, the engine resistance is increased, and the performance of the storage device 72 for supplying power to the assist power generation motor 63 and the lead battery for supplying power to the starter 64 The performance of 65 is reduced. For this reason, in a low temperature environment, the third engine starting means for cranking the engine 61 using the assist power generation motor 63 and the starter 64 in combination is selected, and the rotation speed in the steady operation possible range from the engine start start Shorten the time to get to

  According to the first embodiment of the engine start control system and method of the hybrid work machine of the present invention described above, the engine 64 is started by properly using the starter 64 and the assist power generation motor 63 according to the outside air temperature. Therefore, it is possible to reach the rotational speed within the steady-state operable range in a short time. As a result, since the engine can be started without giving a stress to the operator, the workability is improved.

  In the present embodiment, an example has been described in which the cranking mode of engine start is selected according to the outside air temperature detected by outside air temperature sensor 73 and the SOC of power storage device 72, but one of the selection conditions Certain outside air temperatures are not limited to this. For example, the temperature of the cooling water of the engine 61 detected by the cooling water temperature sensor 67 input to the vehicle controller 34, the temperature of the hydraulic oil detected by the hydraulic oil temperature sensor 68, etc. are set as one of the selection conditions. The result of comparing the detected value with a predetermined threshold may be used as the selection condition of the cranking mode of the engine start.

  Hereinafter, a second embodiment of an engine start control device and method for a hybrid working machine of the present invention will be described using the drawings. FIG. 8 is a control block diagram showing the configuration of a second embodiment of the engine start control device for a hybrid work machine of the present invention, and FIG. 9 is a second embodiment of the engine start control device for a hybrid work machine according to the present invention. It is a table figure showing an example of monthly mean lowest temperature memorized by storage device of a form of. In FIG. 8 and FIG. 9, since the thing of the code | symbol same as the code | symbol shown in FIG. 1 thru | or FIG. 7 is an identical part, the detailed description is abbreviate | omitted.

  In the second embodiment of the engine start control device for a hybrid work machine of the present invention, the outside air temperature sensor 73 for detecting the outside air temperature is omitted, and the outside air temperature information is obtained using the GPS receiver 37 and the storage device 36. Is different from the first embodiment in that it predicts and controls. Since the GPS receiver 37 is used to record the operation time, the operation place, etc., the storage device 36 is generally provided in advance in the work machine in order to store information used for various controls. There is.

  In FIG. 8, the GPS receiver 37 receives regional information and date information from the GPS satellites 38, and transmits the information to the vehicle controller 34. In addition, the vehicle controller 34 can pull out pre-recorded information from the storage device 36 as needed.

The method of engine start control in the present embodiment is different in the processing content of (step S3) in FIG. 4 showing the processing flow of the first embodiment. In the first embodiment, the detected outside air temperature to be compared with the threshold T ₁ is required, but in the present embodiment, outside air temperature information is predicted and compared with the threshold by performing the following processing. .

First, the GPS receiver 37 acquires the position information and date information of the working site of the working machine from the GPS satellite 38 and transmits it to the vehicle controller 34. The vehicle body controller 34 loads the monthly average minimum temperature information of the corresponding area stored in advance from the storage device 36 based on the received position information and date information. Vehicle controller 34 predicts the average minimum temperature for the appropriate month as the current outside air temperature, as in the first embodiment is compared with the outside air temperature and the thresholds T ₁ This predicted in (step S3). Here, the reason that the average minimum temperature is used as the outside air temperature is that the minimum temperature of the day is often recorded in the morning when the hydraulic shovel is most often activated.

FIG. 9 shows a table of average monthly minimum temperatures in Tomsk, Russia, as an example of the average monthly minimum temperatures stored in the storage unit 36. 9, when the threshold _{T 1} is for example a -10 ° C., March 1, November, average minimum temperature December below the thresholds _{T 1.} Therefore, when the SOC of the power storage device 72 is sufficient, the engine 61 is cranked and started using the assist power generation motor 63 and the starter 64 in combination. Conversely, since the average minimum temperature from April to October in excess of threshold T _1, when SOC of power storage device 72 is sufficient, the assist power generating motor 63 alone engine 61 to crank start. As a result, the engine 61 can reach the rotational speed within the steady-state operable range in a short time.

  According to the second embodiment of the engine start control device and method of the hybrid working machine of the present invention described above, the same effect as that of the first embodiment described above can be obtained.

  Further, according to the second embodiment of the hybrid construction machine of the present invention described above, the outside air temperature sensor 73 can be omitted, and the GPS receiver 37 and storage device 36 generally provided conventionally are used. Cost reduction can be achieved.

The present invention is not limited to the above embodiment, and various modifications and applications are possible. The above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.
For example, although the hybrid type hydraulic shovel was illustrated as a hybrid type work machine in the above-mentioned embodiment, it does not restrict to this.

DESCRIPTION OF SYMBOLS 1 crawler type hybrid hydraulic shovel 10 revolving unit 30 cab 32 key switch 34 vehicle controller 36 storage device 61 engine 62 hydraulic pump 63 assist power generation motor 64 starter 65 lead battery
71 radiator 7 2 power storage device 73 outside air temperature sensor 81 power control unit (PCU)
90 Working equipment

Claims (5)

An engine, a hydraulic pump driven by the engine, a starter connected to the engine via a ring gear, a starter for starting the engine, and a generator motor coaxially connected to a crankshaft of the engine; A storage device for transferring electric power to and from the generator motor, a key switch, a vehicle controller to which a start signal from the key switch is input, an outside air temperature determination means for determining an outside air temperature in an operating area, In an engine start control device for a hybrid work machine, including: a calculation unit that calculates an SOC that indicates a state of charge of the power storage device.
The vehicle body controller, wherein, when SOC calculated by the calculation section is less than or equal to the predetermined SOC threshold outputs a start signal for starting the engine to the starter, SOC SOC calculated that the predetermined by the arithmetic unit When the threshold value is exceeded and the outside air temperature of the operating area determined by the outside air temperature determination means exceeds a predetermined temperature threshold, a start signal for starting the engine is output to the generator motor. SOC calculated by the calculation unit exceeds the predetermined SOC threshold value, and when the outside air temperature of operation areas is determined by the ambient temperature determining means is below the predetermined temperature threshold, starting the engine And a start signal for outputting the start signal to start the engine after a predetermined time has passed after the output. Hybrid working machine the engine start control system and outputs the motive. In the engine start control device for a hybrid work machine according to claim 1,
The outside air temperature determination means is an outside air temperature sensor that detects the temperature of outside air. An engine start control device for a hybrid working machine according to claim 1. In the engine start control device for a hybrid work machine according to claim 1,
A GPS receiver capable of acquiring position and date information of the operating area via a satellite;
And a storage device storing outside air temperature information of the operating area,
The outside air temperature judging means predicts the outside air temperature of the operation area based on the position and date information of the operation area acquired by the GPS receiving device and the outside air temperature information of the operation area stored by the storage device. An engine start control device for a hybrid work machine, characterized in that: In the engine start control device for a hybrid work machine according to claim 1,
The system further comprises a coolant temperature sensor for detecting a temperature of coolant of the engine,
The vehicle body controller outputs a start signal for starting the engine to the starter or outputs it to the generator motor according to the temperature of the engine coolant detected by the coolant temperature sensor. An engine start control device for a hybrid working machine, wherein any one of a starter and output to the generator motor is selected. In the engine start control device for a hybrid work machine according to claim 1,
The hydraulic pump further includes a hydraulic oil temperature sensor that detects a temperature of hydraulic oil discharged by the hydraulic pump.
The vehicle body controller outputs a start signal for starting the engine to the starter or outputs it to the generator motor according to the temperature of the hydraulic fluid detected by the hydraulic fluid temperature sensor, or the starter and the starter An engine start control device for a hybrid work machine, characterized by selecting one of output to a generator motor.

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