KR102057275B1 - Engine starting device of hybrid construction machinery - Google Patents

Abstract

The starting device of the hybrid construction machine includes a starter, an ultra capacitor, a battery, a second switch unit and a starter switch. The starter starts the engine. The ultracapacitor includes a drive capacitor for powering a drive motor, a start capacitor for powering a starter, and a first switch unit for connecting the start capacitor to the drive capacitor. The battery powers the starter. The second switch unit connects the battery to the starting capacitor. The starter switch connects the starter to the starting capacitor and battery.

Description

Starting device for hybrid construction machine {ENGINE STARTING DEVICE OF HYBRID CONSTRUCTION MACHINERY}

The present invention relates to a hybrid construction machine, and more particularly to a starting device for a hybrid construction machine capable of idling operation and low temperature start.

Recently, in order to improve fuel economy of construction machinery, research is being actively conducted on hybrid construction machinery that stores surplus power of an engine in a battery and supplies insufficient power of the engine from a battery.

In general, hybrid construction machines use engines and drive motors as common power sources and include electrical storage devices. For example, hybrid excavators can improve fuel economy by further including drive motors and electrical storage devices in common excavators powered by engines. Here, the electrical storage device includes a battery and an ultra-capacitor.

Hybrid construction machines use batteries to start the engine. However, since an instantaneous high output is required at the start of the engine, the life of the battery may be shortened as the number of starts increases. In addition, the hybrid construction machine has a problem that it is difficult to increase the output momentarily because the output capacity of the battery is lowered when starting the engine at a low temperature.

One object of the present invention is to provide a starting device for a hybrid construction machine with enhanced idling operation and low temperature starting characteristics.

However, the object of the present invention is not limited to the above objects, and may be variously expanded within a range without departing from the spirit and scope of the present invention.

In order to achieve the above object of the present invention, the starting device of the hybrid construction machine according to the exemplary embodiments of the present invention may include a starter, an ultra capacitor, a battery, a second switch unit, a starter switch. The starter can start the engine. The ultracapacitor may include a driving capacitor for powering a driving motor, a starting capacitor for powering the starter, and a first switch unit connecting the starting capacitor to the driving capacitor. The battery may power the starter. The second switch unit may connect the battery to the starting capacitor. The starter switch may connect the starter to the starting capacitor and the battery.

In example embodiments, when restarting the engine in an idle state, the first switch portion may be turned off, and the second switch portion may be turned on. Can be.

In example embodiments, when the hybrid construction machine is in operation, the first switch unit may be turned on and the second switch unit may be turned off.

In example embodiments, when the engine is started at a predetermined temperature or less, the first switch unit may be turned off and the second switch unit may be turned on.

In example embodiments, when the difference between the voltage of the starting capacitor and the voltage of the battery exceeds a predetermined value, the voltage until the difference between the voltage of the starting capacitor and the voltage of the battery is equal to or less than the predetermined value. The starting capacitor can be charged by the battery.

In example embodiments, the power supply unit may further include a voltage adjuster connected to the starting capacitor and the battery to adjust a voltage level.

In example embodiments, the voltage adjustor may include a DC-DC converter.

In example embodiments, the voltage adjustor may include a current limiting resistor.

In example embodiments, the ultracapacitor may further include a third switch configured to connect cells included in the starting capacitor in parallel between the driving capacitor and the starting capacitor.

In example embodiments, the third switch unit may be turned on when the engine is started or restarted, and may be turned off when the hybrid construction machine is in operation.

In some example embodiments, the starting capacitor may include some of the cells to form a voltage having the same magnitude as the voltage of the battery among a plurality of cells included in the ultra capacitor.

The starting device of the hybrid construction machine according to the exemplary embodiments may improve fuel economy by stopping the driving of the engine in the idling operation mode. In addition, the starter of the hybrid construction machine uses a starter capacitor, which is part of the ultracapacitor, with the battery to start the engine to extend the life of the battery and improve the output at low temperature startup.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded within a range without departing from the spirit and scope of the present invention.

1 is a circuit diagram illustrating a starting device of a hybrid construction machine according to exemplary embodiments.
FIG. 2 is a flowchart illustrating an example of a method of driving idling in the starting device of the hybrid construction machine of FIG. 1.
3 is a diagram illustrating an example of a state of a starter of the hybrid construction machine when the engine is restarted in the idling driving method of FIG. 2.
4 is a diagram illustrating an example of a state of a starter of a hybrid construction machine during operation in the idling driving method of FIG. 2.
5A and 5B are diagrams showing examples of the voltage adjusting unit in the starting device of the hybrid construction machine of FIG. 1.
FIG. 6 is a flowchart illustrating an example of a low-temperature start-up method in the starting apparatus of the hybrid construction machine of FIG. 1.
FIG. 7 is a diagram illustrating an example of a state of a starter of a hybrid construction machine when charging a capacitor in the low temperature start-up method of FIG. 6.
8 is a graph showing the effect of the starting device of the hybrid construction machine of FIG.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous modifications, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. .

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same elements in the drawings, and duplicate descriptions of the same elements are omitted.

1 is a circuit diagram illustrating a starting device of a hybrid construction machine according to exemplary embodiments.

Referring to FIG. 1, a starter device 100 of a hybrid construction machine includes a starter 120, an ultracapacitor 140, a battery 160, a second switch unit 170, a voltage adjuster 180, and a starter switch 190. ) May be included.

The starter 120 may start the engine of the hybrid construction machine by receiving driving power from the starter capacitor 148 included in the battery 160 and the ultra capacitor 140.

The ultra capacitor 140 may include a driving capacitor 142, a first switch unit 144, and a start capacitor 148.

The driving capacitor 142 may increase power efficiency by operating the hybrid construction machine together with the engine by supplying power to the driving motor. For example, in an excavator, the driving capacitor 142 may use the charged voltage to power the swing motor for the swing operation of the excavator. Since the driving capacitor 142 included in the ultra capacitor 140 may have a greater power density than the battery 160, the driving capacitor 142 may supply a large power to the hybrid construction machine.

The starting capacitor 148 may power the starter 120 together with the battery 160 at engine start or restart. When starting the engine using only the battery 160, since the instantaneous high output is required for the battery 160, the load of the battery 160 is reduced by providing power to the starter 120 using the starting capacitor 148. Can be. Therefore, the starting device 100 of the hybrid construction machine may extend the life of the battery 160 by using the starting capacitor 148 included in the ultra capacitor 140. In addition, the low-temperature start-up characteristics may be improved by preventing a phenomenon in which the output capacity of the battery 160 decreases during low-temperature start-up. Since the voltage of the ultracapacitor 140 (eg 200V) is higher than the voltage of the battery 160 (eg 12V), the ultracapacitor 140 is used to power the starter 120 using the entire ultracapacitor 140. Instead, the starter 120 may be powered by the start capacitor 148 that is part of the ultra capacitor 140. In one embodiment, the starting capacitor 148 may include a portion of the cells to form a voltage of the same size as the voltage of the battery 160 of the plurality of cells included in the ultra capacitor 140. That is, by setting the size of the start capacitor 148 so that the start capacitor 148 and the battery 160 form the same voltage, it can be driven stably without a separate converter.

The first switch unit 144 may connect the starting capacitor 148 to the driving capacitor 142. That is, the first switch unit 144 may be turned on to connect the starting capacitor 148 and the driving capacitor 142, and may be turned off to release the connection of the starting capacitor 148 and the driving capacitor 142. You can. In one embodiment, when the hybrid construction machine is in operation, the first switch unit 144 is turned on to connect the start capacitor 148 and the drive capacitor 142 so that the start capacitor 148 is an ultra capacitor 140. May be used to power the drive motor together with the drive capacitor 142. In one embodiment, when starting or restarting the engine, the first switch unit 144 is turned off to power the starter 120 using the battery 160 and the start capacitor 148 to start the start capacitor. 148 may be disconnected from the driving capacitor 142.

The ultracapacitor 140 may further include a third switch unit 146 connecting the cells included in the starting capacitor 148 in parallel between the driving capacitor 142 and the starting capacitor 148. That is, the third switch unit 146 may divide the ultra capacitor 140 into the driving capacitor 142 and the starting capacitor 148, and may connect the starting capacitor 148 to the battery 160 in parallel. The third switch unit 146 operates opposite to the first switch unit 144 so that when the first switch unit 144 is turned on, the third switch unit 146 is turned off and the first switch unit 146 When 144 is turned off, the third switch unit 146 may be turned on. In one embodiment, when the hybrid construction machine is in operation, the third switch unit 146 may be turned off. In one embodiment, when starting or restarting the engine, the third switch unit 146 may be turned on.

The battery 160 may power the starter 120. The battery 160 powers the starter 120 together with the starting capacitor 148 to enable the hybrid construction machine to be started without increasing the output from the battery 160. In addition, the battery 160 may charge the discharged starting capacitor 148. Since the start capacitor 148 may be easily discharged when it is left for a long time due to its characteristics, the start capacitor 148 may be discharged before starting or restarting, and when the start capacitor 148 is discharged, the battery 160 and the start capacitor ( 148 may be connected to charge the starting capacitor 148. In one embodiment, when the difference between the voltage of the start capacitor 148 and the voltage of the battery 160 exceeds a predetermined value, the difference between the voltage of the start capacitor 148 and the voltage of the battery 160 is less than or equal to a predetermined value. Starting capacitor 148 may be charged by battery 160 until In addition, battery 160 may be used to power hybrid construction machinery. Since the battery 160 has a smaller output than the ultracapacitor 140 but may have a high energy density, the battery 160 may supply a small power and a large amount of energy required in the long term.

The second switch unit 170 may connect the battery 160 to the starting capacitor 148. That is, the second switch unit 170 may be turned on to connect the battery 160 and the starting capacitor 148, and may be turned off to release the connection of the battery 160 and the starting capacitor 148. have. In one embodiment, when starting or restarting the engine, the second switch unit 170 is turned on to power the starter 120 by using the battery 160 and the starting capacitor 148. 160 and the starting capacitor 148 may be connected. In an embodiment, the second switch unit 170 may be turned on to charge the starting capacitor 148 using the battery 160 to connect the battery 160 and the starting capacitor 148. In one embodiment, when the hybrid construction machine is in operation, the start capacitor 148 can be used to power the drive motor with the drive capacitor 142, so that the second switch portion 170 is turned off and the battery The connection of the 160 and the starting capacitor 148 may be disconnected.

The voltage adjusting unit 180 may be connected to the start capacitor 148 and the battery 160 to adjust the voltage level to safely connect the start capacitor 148 and the battery 160 in parallel. When a large voltage difference between the starting capacitor 148 and the battery 160 occurs, an inrush current may occur and the starting device may be damaged or malfunction. Thus, the starting device of the hybrid construction machine 100 includes the voltage adjusting unit 180. The starting capacitor 148 and the battery 160 may be safely charged and discharged. The voltage adjustor 180 may include various circuits for controlling the outputs of the start capacitor 148 and the battery 160. In one embodiment, the voltage adjuster 180 may include a DC-DC converter. In another embodiment, the voltage adjusting unit 180 may include a current limiting resistor.

The starter switch 190 may connect the starter 120 to the start capacitor 148 and the battery 160 to start or restart the engine.

FIG. 2 is a flowchart illustrating an example of a method of driving idling in the starting device of the hybrid construction machine of FIG. 1.

Referring to FIG. 2, the hybrid construction machine may operate in an idling operation mode by using a starter of the hybrid construction machine.

By checking the idling driving mode entry condition, it may enter the idling driving mode (S110). For example, when the idling driving mode is set and there is no operation for a predetermined time, the hybrid construction equipment may enter the idling driving mode to improve fuel efficiency.

When entering the idling driving mode, the engine may be changed to the idling state (S120). By entering the idle mode, the engine is turned off to minimize the fuel consumed by the engine.

When the operation signal of the hybrid construction machine is input, an engine restart signal may be received (S130). The engine restart signal for changing from the idling driving mode to the normal driving mode may be received by receiving the operation signal of the hybrid construction machine from the user.

In order to disconnect the driving capacitor and the starting capacitor, the first switch unit may be turned off (S140). As a preliminary step for restarting the engine using the start capacitor and the battery, the first switch may be turned off to separate the start capacitor, which is part of the ultra capacitor, from the drive capacitor.

If the difference between the voltage of the starting capacitor and the voltage of the battery exceeds a predetermined value (S150), the starting capacitor may be charged by the battery until the difference between the voltage of the starting capacitor and the voltage of the battery is less than or equal to the predetermined value ( S160). The starting capacitor can easily be discharged in nature. Therefore, when the starting capacitor is discharged, the starting capacitor can be charged using a battery before restarting the engine.

The second switch unit and the third switch unit may be turned on to restart the engine using the starting capacitor and the battery (S170). By turning on the second switch unit and the third switch unit, the starting capacitor and the battery may be connected in parallel.

The engine may be restarted by turning on the starter switch (S180). When the starter switch is turned on, the starter can receive power from the starter capacitor and the battery, allowing the engine to restart.

When the engine is restarted, the hybrid construction equipment may turn off the second switch unit and the third switch unit and turn on the first switch unit to enter the normal operation mode (S190). By turning off the second switch portion and the third switch portion and turning on the first switch portion, the starting capacitor may be connected with the driving capacitor to power the driving motor together with the driving capacitor as part of the ultra capacitor.

3 is a diagram illustrating an example of a state of a starter of the hybrid construction machine when the engine is restarted in the idling driving method of FIG. 2.

Referring to FIG. 3, the starting device of the hybrid construction equipment may restart the engine in an idling operation mode. The starting device of the hybrid construction equipment connects the start capacitor 148 and the battery 160 in parallel, and the starter 120 receives power from the start capacitor 148 and the battery 160 to restart the engine. That is, the switches SR1 and SR2 included in the first switch unit 144 may be turned off to disconnect the driving capacitor 142 from the start capacitor 148. In addition, the switches SR3 and SR4 included in the second switch unit 170 and the switch SR5 included in the third switch unit 146 are turned on so that the start capacitor 148 and the battery 160 are turned on. Can be connected in parallel. As the starter switch 190 is turned on, the starter 120 may receive power from the starting capacitor 148 and the battery 160 to restart the engine in the idling operation mode.

4 is a diagram illustrating an example of a state of a starter of a hybrid construction machine during operation in the idling driving method of FIG. 2.

Referring to FIG. 4, the start device of the hybrid construction equipment may be disconnected from the start capacitor 148 and the battery 160 in the normal operation mode, and the start capacitor 148 may be connected to the drive capacitor 142. That is, the switches SR1 and SR2 included in the first switch unit 144 may be turned on to connect the start capacitor 148 to the driving capacitor 142. In addition, the switches SR3 and SR4 included in the second switch unit 170 and the switch SR5 included in the third switch unit 146 are turned off to turn off the start capacitor 148 and the battery 160. The connection can be released. Thus, the start capacitor 148 may be connected to the drive capacitor 142 to power the drive motor along with the drive capacitor 142 as part of the ultra capacitor 140.

5A and 5B are circuit diagrams showing examples of the voltage adjusting unit in the starting device of the hybrid construction machine of FIG. 1.

5A and 5B, the voltage adjustor may safely connect the starting capacitor and the battery in parallel by adjusting a voltage level between the starting capacitor and the battery. If a large voltage difference between the starting capacitor and the battery is generated, an inrush current may occur and the starting device may be damaged or malfunction. Thus, the starting device of the hybrid construction machine may include a voltage adjusting unit, so that the starting capacitor and the battery may be safely charged and discharged.

In one embodiment, as shown in FIG. 5A, the voltage adjuster 180a may include a DC-DC converter. The DC-DC converter includes a power semiconductor and is connected between the starting capacitor and the battery to regulate the output of the capacitor and the battery. The voltage regulator including the DC-DC converter can finely adjust the current in both directions, thereby improving stability during charging and discharging of the capacitor and the battery.

In another embodiment, as shown in FIG. 5B, the voltage adjusting unit 180b may include a current limiting resistor to prevent inrush current due to a potential difference between the starting capacitor and the battery. The voltage regulator including the current limiting resistor is simple in configuration, and thus, it is possible to obtain the effect of limiting the current flowing between the starting capacitor and the battery at a relatively lower cost than the voltage regulator using the DC-DC converter.

In the above, the voltage regulator includes a DC-DC converter or a current limiting resistor to control the output of the starting capacitor and the battery, but the voltage regulator may include various circuits for controlling the output of the starting capacitor and the battery.

FIG. 6 is a flowchart illustrating an example of a low-temperature start-up method in the starting apparatus of the hybrid construction machine of FIG. 1.

Referring to FIG. 6, the starting device of the hybrid construction machine may improve low temperature starting characteristics. When starting the engine at low temperatures using only the battery (for example, starting the engine at sub-zero temperatures), the output capacity of the battery is reduced, making it difficult to generate instantaneous high output from the battery or high output. This can shorten the life of the battery. In the case of a hybrid construction machine starter that starts an engine using a starter capacitor together with a battery, the starter capacitor can easily achieve high output even at low temperatures, and can extend its life by reducing the load on the battery.

In detail, the starter of the hybrid construction machine may check whether the current temperature is lower than the preset temperature in order to check whether the low temperature starts (S210). For example, a starter of a hybrid construction machine can start an engine using a starter capacitor together with a battery to improve cold start characteristics at sub-zero temperatures.

In order to disconnect the driving capacitor and the starting capacitor, the first switch unit may be turned off (S240). As a preliminary step for starting the engine using the starting capacitor and the battery, the first switching unit may be turned off to separate the starting capacitor which is part of the ultra capacitor from the driving capacitor.

When the difference between the voltage of the starting capacitor and the voltage of the battery exceeds a predetermined value (S250), the starting capacitor may be charged by the battery until the difference between the voltage of the starting capacitor and the voltage of the battery is less than or equal to the predetermined value ( S260). Starting capacitors can be easily discharged if left for a long period of time. Therefore, when the starting capacitor is discharged, the starting capacitor can be charged using a battery before starting the engine.

The second switch unit and the third switch unit may be turned on to start the engine using the starting capacitor and the battery (S270). By turning on the second switch unit and the third switch unit, the starting capacitor and the battery may be connected in parallel.

The engine may be started by turning on the starter switch (S280). When the starter switch is turned on, the starter may receive power from the starting capacitor and the battery to start the engine.

When the engine is started, the hybrid construction equipment may turn off the second switch unit and the third switch unit and turn on the first switch unit to enter the normal operation mode (S290). By turning off the second switch portion and the third switch portion and turning on the first switch portion, the starting capacitor may be connected with the driving capacitor to power the driving motor together with the driving capacitor as part of the ultra capacitor.

FIG. 7 is a diagram illustrating an example of a state of a starter of a hybrid construction machine when charging a capacitor in the low temperature start-up method of FIG. 6.

Referring to FIG. 7, since the starting capacitor 148 may be easily discharged when it is left for a long time due to its characteristics, the starting capacitor 148 may be checked before starting, and the starting device 100 of the hybrid construction equipment may be started. When the capacitor 148 is discharged, the capacitor 148 may be charged using the battery 160.

The starting device 100 of the hybrid construction equipment may connect the starting capacitor 148 to the battery 160 when the starting capacitor 148 is charged, and disconnect the starting capacitor 148 and the driving capacitor 142. . That is, the switches SR1 and SR2 included in the first switch unit 144 may be turned off to separate the starting capacitor 148 from the driving capacitor 142. In addition, the switches SR3 and SR4 included in the second switch unit 170 and the switch SR5 included in the third switch unit 146 are turned on to transfer the start capacitor 148 to the battery 160. Can be connected. The starting capacitor 148 may be charged by the battery 160 until the difference between the voltage of the starting capacitor 148 and the voltage of the battery 160 is equal to or less than a predetermined value.

8 is a graph showing the effect of the starting device of the hybrid construction machine of FIG.

Referring to FIG. 8, a starter of a hybrid construction machine may use a starter capacitor that is part of an ultracapacitor together with a battery for starting or restarting the engine.

When starting or restarting the engine using only the battery, the battery can instantaneously start the engine at a high output (eg 10C, 10 times the battery nominal capacity 1C). If the output of the battery is severe, the internal loss due to the internal resistance of the battery is large and may adversely affect the life of the battery. As such, as the number of times of starting or restarting the engine increases due to the load generating the instantaneous high output, the battery life may be shortened. In particular, since the hybrid construction equipment has a large number of restarts of the engine, shortening the life of the battery may be more problematic. In addition, when starting the engine at a low temperature using only the battery, the output capacity of the battery is lowered may cause a problem that it is difficult to generate a high output momentarily.

On the other hand, the starting device of the hybrid construction machine according to the exemplary embodiments may start or restart the engine with the starting capacitor along with the battery. Since the internal resistance of the starting capacitor is significantly lower than the internal resistance of the battery, the starting device of a hybrid construction machine generates an output generated from the battery by generating a high output at the starting capacitor (for example, 9C, which is 9 times the battery nominal capacity 1C). For example, the battery notation capacity 1C) may be lowered. In addition, when starting the engine at a low temperature, it is possible to generate a high output instantaneously by using a starting capacitor can improve the low temperature starting characteristics.

Thus, the starting device of the hybrid construction machine according to the exemplary embodiments can improve fuel economy by stopping the driving of the engine in the idling operation mode. In addition, the starter of the hybrid construction machine can use the starter capacitor, which is part of the ultracapacitor, with the battery to start the engine to extend the life of the battery and improve the output at low temperature start-up.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated.

100: starting device of the hybrid construction machine
120: starter 140: ultra capacitor
142: driving capacitor 144: first switch unit
146: third switch unit 148: starting capacitor
160: battery 170: second switch unit
180: voltage adjusting unit 190: starter switch

Claims (11)

A starter for starting the engine;
An ultracapacitor including a driving capacitor for powering a driving motor, a starting capacitor for powering the starter, and a first switch unit connecting the starting capacitor to the driving capacitor;
A battery for powering the starter;
A second switch unit connecting the battery to the starting capacitor; And
A starter switch connecting the starter to the starting capacitor and the battery;
At the start of the engine,
And the first switch unit disconnects the starting capacitor and the driving capacitor, and the second switch unit connects the starting capacitor and the battery. delete The method of claim 1 wherein the hybrid construction machine is in operation,
The first switch unit is turned on,
Starting device of the hybrid construction machine, characterized in that the second switch unit is turned off. The method of claim 1, wherein when the engine is started below a predetermined temperature,
The first switch unit is turned off,
Starting device of the hybrid construction machine, characterized in that the second switch unit is turned on. The method of claim 1, wherein the difference between the voltage of the starting capacitor and the voltage of the battery exceeds a predetermined value.
And the starting capacitor is charged by the battery until the difference between the voltage of the starting capacitor and the voltage of the battery is equal to or less than the predetermined value. According to claim 1,
And a voltage adjusting unit connected to the starting capacitor and the battery to adjust a voltage level. delete delete The method of claim 1, wherein the ultracapacitor
And a third switch unit configured to connect the cells included in the starting capacitor in parallel between the driving capacitor and the starting capacitor. The starting device of claim 9, wherein the third switch unit is turned on when the engine is started or restarted, and is turned off when the hybrid construction machine is in operation. The method of claim 1, 3 to 6, 9 and 10, wherein the starting capacitor is a voltage of the same size as the voltage of the battery of the plurality of cells included in the ultra-capacitor. Starting device of a hybrid construction machine, characterized in that it comprises a portion of the cells to form.

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