KR102046661B1 - System and method in order to sudden decrease protection for the Engine RPM of the Work machinery - Google Patents

System and method in order to sudden decrease protection for the Engine RPM of the Work machinery Download PDF

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Publication number
KR102046661B1
KR102046661B1 KR1020130125113A KR20130125113A KR102046661B1 KR 102046661 B1 KR102046661 B1 KR 102046661B1 KR 1020130125113 A KR1020130125113 A KR 1020130125113A KR 20130125113 A KR20130125113 A KR 20130125113A KR 102046661 B1 KR102046661 B1 KR 102046661B1
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South Korea
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engine
load signal
engine rpm
sudden load
sudden
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KR1020130125113A
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Korean (ko)
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KR20150046406A (en
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유진환
손동연
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두산인프라코어 주식회사
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The present invention relates to an apparatus and a method for preventing sudden drop in engine speed of a working machine.
The apparatus and method for preventing sudden drop in engine speed of a working machine according to the present invention generates a sudden load signal when operating a joystick when a sudden load occurs, and corrects the engine speed upward when the sudden load signal is generated. It is possible to improve the engine speed drop by increasing the engine torque before the impact of the engine load, and the upward-corrected corrected engine RPM value to be released after the calculated holding time has elapsed. Prevent it.

Description

System and method in order to sudden decrease protection for the Engine RPM of the Work machinery}

The present invention relates to an apparatus and a method for preventing sudden drop in engine speed of a working machine, and more particularly, to keep engine speed stable by preventing the engine speed from dropping rapidly when a sudden load is applied in the working machine. The present invention relates to an apparatus and a method for preventing sudden drop in engine speed of a working machine.

In general, a working machine generates power from an engine, and operates a hydraulic system with the power to perform a desired task. Examples of working machines include excavators, forklifts, loaders, dozers, special vehicles, and the like.

The working machine is connected to the engine and the hydraulic pump of the hydraulic system, the hydraulic pump is operated by the power output from the engine. The hydraulic pump discharges the working oil, the working oil is provided to the working machine, and the working machine is operated by the working oil to perform the desired work.

When performing the desired work, the work tool may be subjected to a sudden load or may require a sharply large torque. For example, when performing excavation work with an excavator, there are times when a large stone, a concrete mass, etc. are encountered while excavating soil or sand. Torque is more demanding when digging large stones than when digging soil. That is, suddenly a large torque may be required while performing the excavation work, in which case the excavator driver will want to implement a large torque by operating the joystick sharply. If a large torque is required, the engine speed is increased to increase the engine power. If the engine power increases, it can cope with a large torque.

As described above, a sudden increase in load in a short time or a rapid increase in torque are defined as "load".

On the other hand, the engine is also mounted on a vehicle for transportation or transportation purposes, but such a vehicle engine is controlled in a completely different manner from the engine mounted on the work machine. If this is explained in detail.

The vehicle changes in real time corresponding to the engine speed according to the traveling speed.

On the other hand, the engine mounted on the working machine sets the engine speed in advance in consideration of the light weight of the load. As a result, the engine of the working machine is controlled to maintain a constant engine speed, and this control is referred to as an all speed governor. The engine is controlled by an engine control unit (ECU).

However, when a sudden load occurs in the work machine, the sudden load information is not immediately transmitted to the engine control device. That is, when a sudden load is generated, the load is applied to the hydraulic pump, and the hydraulic load is applied to the engine due to the increase in the hydraulic load of the hydraulic pump. In this case, the engine speed is not maintained due to the sudden increase in the hydraulic load. In this case, the engine speed drop phenomenon occurs in which the engine speed drops sharply.

If the engine speed suddenly decreases instantaneously, the engine power is reduced, thereby preventing the hydraulic oil from being discharged normally. In this case, the work machine may stop working or become unstable, and furthermore, there is a concern that the overall performance of the work machine may be degraded. In addition, the engine may be stopped when a large amount of engine speed sudden drop occurs.

The following three methods are known as a method for improving the above-mentioned engine speed drop.

The first solution is to change the hydraulic pump into a variable hydraulic pump that can regulate the flow rate instead of the fixed hydraulic pump. In the hydraulic system to which the variable hydraulic pump is applied, when the sudden load is applied to the work machine, the sudden load can be adjusted to reduce the discharge flow rate instantaneously, thereby reducing the instantaneous load on the engine. That is, the hydraulic system to which the variable type hydraulic pump is applied can improve the engine speed drop. However, there is a problem that the price of the variable hydraulic pump is very expensive compared to the fixed hydraulic pump. In addition, in order for the variable hydraulic pump to operate normally, there are problems that many peripheral devices must be installed.

The second approach is to increase the rotational inertia of the engine to withstand the momentary load of the hydraulic pump. Increasing the rotational inertia of the engine increases the rotational inertia energy of the engine compared to the energy of the momentary load of the hydraulic pump, thereby improving the engine rotational supply deterioration phenomenon. However, in order to increase the rotational inertia of the engine, the weight of the flywheel must be increased, thereby increasing the manufacturing cost of the working machine. In addition, when the weight of the flywheel is increased, engine durability may deteriorate.

The third solution is to keep the engine idle speed high enough to withstand the momentary load of the hydraulic pump. Basically, if the engine speed is kept high, the rotational inertia energy of the engine is large compared to the energy of the momentary load of the hydraulic pump, thereby improving the engine speed drop. However, when the engine idle speed is maintained high, the fuel consumption is increased, there is a problem that the fuel economy is worse.

Republic of Korea Patent Publication No. 10-2004-0057486 (2004.07.02.) Republic of Korea Patent Publication No. 10-2005-0066042 (2005.06.30.)

Therefore, the technical problem to be achieved by the present invention is to reduce the engine speed drop phenomenon when the sudden load occurs, and to prevent the rapid reduction of the engine speed of the working machine to prevent excessive consumption of fuel The purpose is to provide.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, another technical problem not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

Apparatus for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention for achieving the above technical problem, the feed signal generating unit 100 for generating a sudden load signal by a sharp operation of the joystick; An engine control apparatus 200 in which a current engine RPM value 210 and a current engine torque value 220 are output; A correction engine RPM calculation unit 400 in which the current engine RPM value 210 and the current engine torque value 220 are input to the correction engine RPM map 410 to calculate a correction engine RPM value; A maintenance time calculator 500 for inputting the current engine RPM value 210 to the maintenance time map 510 to calculate a maintenance time; And a control unit 300 controlled to provide the corrected engine RPM value to the engine control apparatus 200 during the maintenance time, wherein the engine is controlled by the engine control apparatus 200 when the sudden load signal is generated. Characterized in that the correction engine RPM value.

In addition, in the apparatus for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention, the correction engine RPM calculation unit 400, when the sudden load signal is generated, the correction engine RPM value is selected, The engine selector 430 may be selected so that the engine RPM is not corrected when the sudden load signal is not generated.

In addition, in the sudden drop prevention of the engine speed of the working machine according to an embodiment of the present invention, the holding time calculation unit 500, the holding time is selected when the sudden load signal is generated, the sudden load And a second selector 520 for selecting a holding time 530 without a holding time when no signal is generated.

In addition, in the rapid drop prevention apparatus of the engine speed of the working machine according to an embodiment of the present invention, the load signal generation unit 100, on / off switch installed in the pilot hydraulic line; The off switch may be connected to the joystick to generate the sudden load signal when the joystick is operated.

In addition, in the rapid drop prevention apparatus of the engine speed of the working machine according to an embodiment of the present invention, the sudden load signal generation unit 100, the joystick is electronic, on / off switch installed on the joystick; The on / off switch may generate the sudden load signal when the joystick is operated.

In order to prevent the rapid decrease in the engine speed of the working machine according to an embodiment of the present invention for achieving the technical problem, the current engine RPM value 210 and the current engine torque value 220 from the engine control device 200 A first step S1 received; A second step (S2) in which the current engine RPM value 210 and the current engine torque value 220 are input to the correction engine RPM map 410 to calculate a correction engine RPM value; A third step (S3) in which the current engine RPM value 210 is input to the maintenance time map 510 to calculate the maintenance time; And a fourth step (S4) of determining whether the sudden load signal is generated and ending if the sudden load signal is not generated. And a fifth step S5 of outputting the corrected engine RPM value to the engine control apparatus 200 during the holding time, if a sudden load signal is generated in the fourth step S4.

In addition, in the method of preventing sudden drop in the engine speed of the working machine according to the embodiment of the present invention, the fourth step (S4) of determining whether the sudden load signal is generated is the third step (S3) in which the holding time is calculated. May be performed before).

Specific details of other embodiments are included in the detailed description and the drawings.

Apparatus and method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention as described above, when a sudden load occurs as the driver of the working machine sharply operates the joystick, abrupt operation of the joystick It is generated as a sudden load signal, when the sudden load signal is generated to generate a corrected engine speed value to upwardly revise the engine speed, it is possible to provide a corrected engine speed value to the engine controller.

As a result, the engine speed is increased just before the effect of the sudden load on the engine, so that even if the sudden load is applied to the engine, the engine speed at which the engine speed is set can be stably maintained, and the engine speed drop phenomenon can be improved. Can be.

1 is a view for explaining an apparatus for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention.
FIG. 2 is a view for explaining an example of calculating a correction engine RPM value and calculating a holding time for maintaining the correction engine RPM value in the apparatus for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention. .
3 is a view showing an embodiment of a correction engine speed map in the apparatus for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention.
Figure 4 is a view showing an embodiment of the maintenance time map in the apparatus for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention.
5 and 6 are flow charts for explaining a method for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. Embodiments described below are shown by way of example in order to help understanding of the present invention, it will be understood that the present invention can be implemented in various modifications different from the embodiments described herein. However, in the following description of the present invention, if it is determined that the detailed description of the related known functions or components may unnecessarily obscure the gist of the present invention, the detailed description and the detailed illustration will be omitted.

Meanwhile, terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and the definitions thereof should be made based on the contents throughout the present specification.

Like reference numerals refer to like elements throughout.

Hereinafter, an apparatus and a method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a view for explaining an apparatus and method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention. 2 is a view illustrating an example of calculating a correction engine RPM value and calculating a holding time for maintaining a correction engine RPM value in an apparatus and method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention. It is a figure for following. 3 is a view showing an embodiment of a correction engine speed map in the apparatus for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention. Figure 4 is a view showing an embodiment of the maintenance time map in the apparatus for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for preventing sudden drop in engine speed of a work machine according to an exemplary embodiment of the present invention may calculate a correction value for correcting engine speed based on collected information, and correct the corrected correction. The engine control device 200 is controlled by calculating a holding time for how long the value is to be maintained.

More specifically, the controller 300 includes a correction engine RPM calculator 400 and a maintenance time calculator 500.

In addition, the control unit 300 is supplied with a sudden load signal from the sudden load signal generator 100, the current engine RPM value 210 and the current torque value 220 from the engine control device 200.

The above-mentioned load signal generator 100 may be applied regardless of whether the type of the joystick is mechanical or electrical.

If the joystick is mechanical, the pilot hydraulic line includes an on / off switch. The on / off switch is connected to the joystick, and the on / off switch generates an electrical signal when the joystick is operated.

When the joystick is electronic, the on / off switch is provided on the electronic joystick, and when the joystick is operated, the electrical signal is generated by the on / off switch.

Therefore, whether the joystick is mechanical or electronic, when the joystick is operated rapidly, the on / off signal generated by the on / off switch can be abruptly switched, and this signal can be understood as a sudden load signal. That is, when the joystick is sharply operated, a sudden load signal is generated, and the sudden load signal is transmitted to the controller 300 described above.

The correction engine RPM calculation unit 400 inputs a current engine RPM value 210 and a current engine torque value 220 to the correction engine RPM map 410 to calculate a correction engine RPM value.

As shown in FIG. 3, the corrected engine RPM map 410 determines how much the engine speed is appropriate in consideration of the engine speed and the engine torque value.

3 shows an embodiment of a correction engine speed map. The correction engine RPM map 410 may be provided in various ways according to the dynamic characteristics of the engine, and in particular, since the engine may have different dynamic characteristics even if manufactured by the same specification from the same manufacturer, the engine may be optimized through a tuning process rather than being uniformly applied. have. In addition, the correction engine RPM map 410 may be released in a state in which the manufacturer is mounted on the control unit 300 in advance, it may be updated later to improve the performance of the working machine.

Meanwhile, the correction engine RPM calculator 400 may include a first selector 420. The first selector 420 selects a correction engine RPM value when the sudden load signal is input from the sudden load signal generator 100, and selects no engine RPM 430 when the sudden load signal is not input. . Engine RPM free calibration 430 may have a value of “zero”. In other words, if the value to correct the engine RPM is "0", it is not to be corrected.

The maintenance time calculator 500 calculates the maintenance time by inputting the current engine RPM value 210 to the maintenance time map 510.

As shown in Fig. 4, the maintenance time map 510 determines how long it is appropriate to maintain the corrected engine speed in consideration of the current engine speed.

The maintenance time map 510 may be provided in various ways according to the dynamic characteristics of the engine. In particular, since the dynamic characteristics may be different even if the engine is manufactured with the same specifications from the same manufacturer, the maintenance time map 510 may be corrected through tuning. In addition, the maintenance time map 510 may be released in a state in which the manufacturer is mounted in the control unit 300 in advance, and may be updated later to improve the performance of the work machine.

The holding time calculator 500 may include a second selector 520. The second selection unit 520 selects the above-mentioned holding time when the feeding signal is input from the feeding signal generator 100, and selects no holding time 530 when the feeding signal is not input. The retention time nothing 530 may have a value of "0 value". In other words, if the holding time is "0", the correction engine RPM value is not maintained, and therefore, the correction is not performed.

Therefore, the apparatus for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention is controlled so that the corrected engine RPM value is provided to the engine controller 200 during the maintenance time, so that the engine controls the engine when the sudden load signal is generated. It is controlled by the apparatus 200 to the correction engine RPM value.

That is, if a sudden load signal is generated by rapidly operating the joystick, the engine speed is corrected to increase by the sudden load signal. As a result, the engine is operated at an engine speed increased from the engine speed which is basically set, thereby increasing the engine torque. Increased engine torque can be prepared for a sudden increase in load due to sudden load, it is possible to improve the phenomenon that the engine speed drops sharply below the set engine speed.

Hereinafter, with reference to the accompanying drawings Figures 5 and 6 will be described in more detail the engine speed abatement method of the working machine according to an embodiment of the present invention. 5 and 6 are flowcharts for explaining a method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention.

First Step S1: The first step S1 is a step of receiving a current engine RPM value 210 and a current engine torque value 220 from the engine control apparatus 200.

The engine control apparatus 200 controls the engine to maintain the set engine speed. And outputs the current engine speed actually implemented. In addition, the engine control apparatus 200 outputs how much engine torque is currently output from the engine.

Second Step S2: The second step S2 is a step of calculating the correction engine RPM value. In more detail, the current engine RPM value 210 and the current engine torque value 220 are input to the correction engine RPM map 410 to calculate the correction engine RPM value.

Since the engine speed and the engine torque are correlated, the correction engine RPM value is calculated in consideration of both variables (engine speed and engine torque). More specifically, when the engine speed is sufficiently high, the correction range of the engine speed may be small. In addition, even when the engine torque is sufficiently large, the correction range of the engine speed may be small. Therefore, as described above, the optimum engine speed can be determined by calculating the corrected engine RPM value in consideration of both variables.

When the engine is controlled at the optimum engine speed, the engine torque decrease is prevented because the engine torque is increased even though the sudden load is applied to the engine. In addition, by applying the optimum engine speed, the engine speed can be prevented from being excessively increased, thereby preventing deterioration of the edges.

Third Step (S3): The third step (S3) is a step of calculating the holding time to maintain the correction engine RPM value. More specifically, the current engine RPM value 210 is input to the maintenance time map 510 to calculate the maintenance time.

The holding time will be further explained. If the holding time is set too long, the compensation engine RPM value is maintained for a long time.In this case, the engine torque is increased to cope with sudden hydraulic load, so that the compensation engine RPM value is maintained even after the sudden load response. do. Since the value of the correction engine RPM is larger than the engine speed set in advance, there is a fear that excessive engine power is output unnecessarily. Therefore, the holding time is preferably set not too long.

In other words, it is recommended to set the maintenance time appropriately, which can minimize the engine speed drop caused by the hydraulic load, and maintain the preset engine speed value after responding to the sudden load. Should be released at an appropriate time.

For example, suppose the preset engine idle speed is 800 rpm, and when the correction engine RPM value is 150 rpm, 950 rpm will be implemented during the holding time. As a result, the engine speed drop phenomenon due to the hydraulic load transmitted from the hydraulic pump to the engine may be improved even if the engine is suddenly loaded, but the engine speed reaches 950 rpm even when the sudden load is released. You will keep it until Therefore, the holding time is preferably set not too long.

Fourth Step S4: The fourth step S4 is a step of determining whether a sudden load signal is generated. It may be determined whether the sudden load signal has been generated, and if the sudden load signal has not been generated, it may be terminated.

Fifth Step S5: In the fifth step S5, when it is determined that the sudden load signal is generated in the fourth step S4, the corrected engine RPM value is output to the engine controller 200 during the holding time.

When the maintenance time elapses, the output of the correction engine RPM value is stopped, and then the engine controller 200 controls the engine to maintain a preset engine speed.

On the other hand, according to another embodiment of the present invention, the method for preventing sudden drop in the engine speed of the working machine according to another embodiment of the third step (S4) of determining whether the sudden load signal is generated in the third step (S3) May be performed before).

That is, in the state where the sudden load signal is not generated, the load of the control unit 300 can be reduced by ending without calculating the holding time. By reducing the load of the control unit 300, the control unit 300 will have a spare resource that can perform other functions not mentioned here, the operating system of the working machine can be more smoothly operated.

As described above, a sudden large load is applied during operation of the working machine according to the embodiment of the present invention, so that the hydraulic load is suddenly increased in the hydraulic pump and the sudden load signal is generated even when the hydraulic load is applied to the engine. By correcting such that the engine speed of the engine is increased, it is possible to prevent the phenomenon that the engine speed drops sharply. As a result, the work machine including the engine can be prevented from deteriorating durability.

In addition, by maintaining the corrected engine RPM value only for a predetermined time, it is possible to prevent excessive waste of fuel by maintaining a preset engine speed immediately after the sudden load is released.

On the other hand, the apparatus and method for preventing sudden drop in the engine speed of the working machine according to an embodiment of the present invention, the engine when the sudden load occurs by updating the control logic while maintaining the hardware of the conventional working machine almost intact Speed drop can be improved.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims, and from the meaning and scope of the claims and their equivalent concepts. All changes or modifications which come out should be construed as being included in the scope of the present invention.

Apparatus and method for preventing sudden drop in engine speed of a working machine according to an embodiment of the present invention can be used to improve the engine speed drop phenomenon when sudden load is required or acted during operation of the working machine. .

100: sudden load signal generator 200: engine control unit (ECU)
210: current engine RPM value 220: current engine torque value
300: control unit 400: correction engine RPM calculation unit
410: correction engine RPM map 420: first selection unit
430: engine RPM free calibration 500: maintenance time calculation unit
510: retention time map 520: second selection unit
530: No hold time

Claims (7)

In a working machine using a fixed displacement hydraulic pump,
A quick load signal generator 100 generating a quick load signal by a sudden manipulation of the joystick;
An engine control apparatus 200 in which a current engine RPM value 210 and a current engine torque value 220 are output;
A correction engine RPM calculation unit 400 in which the current engine RPM value 210 and the current engine torque value 220 are input to the correction engine RPM map 410 to calculate a correction engine RPM value;
A maintenance time calculator 500 for inputting the current engine RPM value 210 to the maintenance time map 510 to calculate a maintenance time; And
And a control unit 300 controlled to provide the corrected engine RPM value to the engine control apparatus 200 during the maintenance time.
The engine is to prevent the sudden drop in the engine speed of the working machine, characterized in that when the sudden load signal is generated by the engine control device 200 is controlled to the corrected engine RPM value for the holding time.

The method of claim 1,
The correction engine RPM calculation unit 400,
The correction engine RPM value is selected when the sudden load signal is generated,
A first selector 420 in which an engine RPM no correction 430 is selected so as not to correct the engine RPM when the sudden load signal is not generated;
Apparatus for preventing a rapid drop in the engine speed of the working machine further comprising.
The method of claim 1,
The holding time calculation unit 500,
The holding time is selected when the sudden load signal is generated,
A second selecting unit 520 for selecting a holding time without a holding time 530 when the sudden load signal is not generated;
Apparatus for preventing a rapid drop in the engine speed of the working machine further comprising.
The method of claim 1,
The sudden load signal generator 100,
An on / off switch installed in the pilot hydraulic line;
And the on / off switch is connected to the joystick to generate the sudden load signal when the joystick is operated.
The method of claim 1,
The sudden load signal generator 100,
And an on / off switch installed on the joystick, wherein the joystick is electronic.
And the on / off switch generates the sudden load signal when the joystick is operated.
In the method of preventing the engine speed decrease of the working machine using a fixed displacement hydraulic pump,
A first step S1 of receiving a current engine RPM value 210 and a current engine torque value 220 from the engine control apparatus 200;
A second step (S2) in which the current engine RPM value 210 and the current engine torque value 220 are input to the correction engine RPM map 410 to calculate a correction engine RPM value;
A third step (S3) in which the current engine RPM value 210 is input to the maintenance time map 510 to calculate the maintenance time; And
A fourth step S4 of determining whether the sudden load signal is generated and ending if the sudden load signal is not generated;
A fifth step (S5) of outputting the correction engine RPM value to the engine control device 200 during the holding time, if a sudden load signal is generated in the fourth step (S4);
Method for preventing a rapid decrease in the engine speed of the working machine comprising a.

The method of claim 6,
And a fourth step (S4) of determining whether the sudden load signal is generated is performed before the third step (S3) in which the holding time is calculated.
KR1020130125113A 2013-10-21 2013-10-21 System and method in order to sudden decrease protection for the Engine RPM of the Work machinery KR102046661B1 (en)

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