KR20170004583A - Control system for Performance compensation of Construction machinery - Google Patents

Abstract

The present invention relates to a control device for compensating performance of a construction machine. According to an embodiment of the present invention, the control device for compensating performance of a construction machine reduces a hydraulic pump control command to control pump torque of a hydraulic pump when supply of fuel is reduced by fuel leakage from a mechanical engine or a throttle valve is open less than a normal value, so that there is a risk of degradation of engine output. Therefore, the control device prevents excessive degradation of engine RPM to maintain the pump torque in good condition.

Description

Technical Field [0001] The present invention relates to a control system for compensating performance of a construction machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for compensating performance of a construction machine, and more particularly to a control device for compensating performance of a construction machine, will be.

In general, construction machinery can be equipped with mechanical engines and hydraulic systems. And various working devices are operated by the hydraulic oil provided in the hydraulic system.

The hydraulic system includes a hydraulic pump, a main controller, an operating unit, and various safety devices. The operation portion may include a joystick or a pedal.

Further, the engine speed of the engine can be set in advance according to the intention of the user. The engine speed can be set in consideration of the size of the workload.

The engine and the hydraulic pump are provided in a directly connected form, whereby the power output from the engine is transmitted to the hydraulic pump to operate the hydraulic pump.

On the other hand, the engine and the hydraulic pump are set so that the torque is matched. In other words, when a work load is largely applied to a hydraulic pump, the work load affects the engine. Then, the engine is restored after the engine speed is lowered at the beginning of the work load, and is controlled so as to increase the engine speed of the engine so as to cope with the work load. Thereby maintaining the work performance of the construction machine.

However, there is a problem that the performance of the mechanical engine deteriorates due to aging, which results in lowering of the work performance.

This will be described in more detail. The mechanical engine is composed of components such as an injector, a throttle valve, a linkage, and a drive motor.

The injector is provided with a plunger, the nozzle of the injector is opened and closed as the plunger moves forward and backward, and the fuel gas is injected into the combustion chamber when the nozzle is opened. However, the plunger may be corroded or abraded by the water contained in the fuel, thereby leaking the fuel. That is, the injector must inject a proper amount of fuel into the combustion chamber to correspond to the command issued from the engine control device, but in reality, the fuel supply may be provided due to the fuel leakage. This reduces the number of revolutions of the engine. Further, as the engine speed decreases, the hydraulic pump can not operate normally and the performance of the construction machine deteriorates.

On the other hand, a spring is provided in the governor, and as the spring ages, the wear progresses and normal operation can not be performed.

On the other hand, the lever of the throttle valve is connected to the linkage motor via a linkage or a wire. That is, the linkage motor is actuated to pull the linkage or wire, thereby opening the throttle valve. The engine control unit (ECU) controls the opening amount of the throttle valve by controlling the linkage motor so as to realize the target engine speed.

However, as mechanical components of the linkage or wire age, the length may change, or the governor spring may wear out and not function normally.

Thereby, even if the operation motor is driven to realize the target engine speed, the throttle valve can be opened incorrectly.

Particularly, when the opening amount of the throttle valve is small, the amount of fuel to be supplied to the combustion chamber of the engine is reduced, and the output of the engine is lowered. Further, since the output of the engine is reduced, the hydraulic pump can not be stably operated, and in particular, the hydraulic torque is reduced, resulting in deterioration of the working performance of the working device.

As described above, when the hydraulic torque is lowered, the work performance is deteriorated, which causes a problem in operation of the construction machine, and the work becomes worse.

Korean Patent Laid-Open Publication No. 10-2013-0075692 (2013.07.05.)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a control system for compensating performance of a construction machine, which, when the performance of a mechanical engine deteriorates, corrects a pump torque command so as to be lower than a normal pump torque command, And to improve the pump torque, so that the construction machine can realize normal work performance, and a control device for compensating the performance of the construction machine.

The present invention has been made in view of the above problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. There will be.

According to an aspect of the present invention, there is provided a control device for compensating performance of a construction machine, comprising: a user engine speed setting unit (60) for setting a target engine speed; A throttle valve sensor 80 for outputting a voltage signal in accordance with the amount of opening of the throttle valve; Calculating a target engine torque based on the target engine speed, calculating an estimated engine speed according to the voltage signal, calculating an estimated engine torque based on the estimated engine speed, calculating a target corresponding to the target engine torque A control unit (100) for calculating a hydraulic pump control command for implementing pump torque; And generating a hydraulic pump control command to implement a pump torque that is lower than the target pump torque when the estimated engine torque reaches a level of 80% to 90% with respect to the target engine torque, And a pump torque correction unit (200) for controlling the hydraulic pump unit.

The pump torque correction unit 200 of the control device for compensating the performance of the construction machine according to the embodiment of the present invention may be configured such that the working device is not operated and the running is stopped, A subtracting engine speed calculating means for calculating a subtracting engine speed by subtracting a predetermined engine speed decreasing constant from the actual engine speed when the condition that the pump pressure is the pressure in the standby state is satisfied, To calculate the correction engine revolution speed, and to generate the corrected hydraulic pump control command based on the correction engine revolution speed.

Further, the pump torque correcting unit 200 of the control device for compensating the performance of the construction machine according to the embodiment of the present invention further includes that the auto idle selection switch is turned on (On) and the auto idle mode is selected .

In addition, the controller for compensating the performance of the construction machine according to the embodiment of the present invention may be calculated after the number of revolutions of the subtracting engine is delayed for the set delay time.

In addition, in the control device for performance compensation of the construction machine according to the embodiment of the present invention, the set delay time may be 0.5 to 1.5 seconds.

The control device for compensating the performance of the construction machine according to the embodiment of the present invention may be such that the actual engine speed is filtered and the engine speed is calculated based on the stabilized engine speed.

In addition, in the controller for compensating the performance of the construction machine according to the embodiment of the present invention, the engine speed reduction constant may be 130 rpm to 170 rpm.

If the pump pressure of the hydraulic pump unit 30 is higher than the set pressure, the control unit 100 of the controller for compensating the performance of the construction machine according to the embodiment of the present invention filters the actual engine speed The stabilized engine revolution speed is obtained, the difference absolute value between the target engine speed and the stable engine speed is obtained every time, and the accumulated difference absolute value is accumulated. To calculate the pump torque limit value based on the average engine speed, and to generate the corrected hydraulic pump control command based on the pump torque limit value.

The control unit 100 of the controller for compensating the performance of the construction machine according to the embodiment of the present invention may be configured to obtain the target engine torque on the basis of the target engine speed, , It is possible to output a warning message for recommending engine check to the instrument panel 90 when the relative humidity reaches 70% to 80%.

In addition, when the actual engine speed reaches 70% to 80% of the target engine speed, the control unit 100 of the controller for compensating the performance of the construction machine according to the embodiment of the present invention may control the dashboard 90 ) To output a warning message to the effect that the engine check is recommended.

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

The control device for compensating the performance of the construction machine according to the embodiment of the present invention as described above is a control device for compensating the performance of the construction machine when the amount of fuel supplied to the combustion chamber is reduced due to fuel leakage, By correcting the command of the pump torque to be lowered, it is possible to prevent the engine speed from dropping, and to increase the pump torque, so that the working performance of the working device can be satisfactorily realized.

1 is a view for explaining control of a hydraulic pump unit of a hydraulic system by a mechanical engine.
Figs. 2 and 3 are views for explaining an example in which the amount of fuel is reduced due to the aging of the components of the mechanical engine.
FIGS. 4 and 5 are diagrams for explaining an example in which engine revolutions are reduced due to aging of components of a mechanical engine.
FIG. 6 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention, in which no correction is performed.
FIG. 7 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention, in which performance compensation is performed.
8 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention.
Fig. 9 is a view for explaining an example of correcting the rated engine speed in Fig. 8; Fig.
Fig. 10 is a diagram for explaining an example of correcting the engine output drop in Fig. 8. Fig.
Figs. 11 to 13 are diagrams for explaining a notification to the user when the performance of the mechanical engine is improved due to the performance of the correction.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the embodiments described below are provided for illustrative purposes only, and that the present invention may be embodied with various modifications and alterations. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention. The accompanying drawings are not necessarily drawn to scale to facilitate understanding of the invention, but may be exaggerated in size.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Like reference numerals refer to like elements throughout the specification.

First, the characteristics of the mechanical engine will be described with reference to Figs. 1 to 5. Fig.

1 is a view for explaining control of a hydraulic pump unit of a hydraulic system by a mechanical engine. Figs. 2 and 3 are views for explaining an example in which the amount of fuel is reduced due to the aging of the components of the mechanical engine. FIGS. 4 and 5 are diagrams for explaining an example in which engine revolutions are reduced due to aging of components of a mechanical engine.

As shown in FIG. 1, the construction machine includes an engine 10, a hydraulic system, a control unit 100, and a pump torque correcting unit 200.

The engine speed can be preset in accordance with the user's intention by using the user engine speed setting unit 60, and the engine speed thus set is the target engine speed. The target engine speed is provided to the engine control unit 50 or the control unit 100. [

Then, the control unit 100 can obtain the target engine torque based on the target engine speed.

The engine 10 outputs power through the shaft 12 and the engine 12 can be provided with an engine speed detection sensor 20 on one side of the shaft 12. The engine speed detected by the engine speed detection sensor 20 can be understood as an actual engine speed. The actual engine speed may be provided to the control unit 100. [ The control unit 100 may be understood as a vehicle control unit (VCU).

In addition, the engine 10 includes a linkage motor 70 and a throttle valve sensor 80.

The linkage motor 70 is operated in accordance with a control signal transmitted from the engine control device 50 to open the gear throttle valve associated with the linkage or the wire.

The throttle valve sensor 80 outputs a voltage signal in accordance with the amount of opening of the throttle valve. That is, the amount of fuel actually provided to the combustion chamber of the engine can be estimated according to the amount of opening of the throttle valve. The engine speed can be estimated based on the amount of fuel. As a result, the engine speed can be estimated according to the intensity of the voltage signal. The estimated engine speed is referred to as the estimated engine speed. The estimated engine speed is provided to the control unit 100. [

Further, the control unit 100 may calculate the estimated engine torque based on the estimated engine speed.

The hydraulic system comprises a hydraulic pump unit (30). The hydraulic pump unit 30 may include a valve unit 31, first and second hydraulic pumps 35 and 36, and an auxiliary pump. The first and second hydraulic pumps 35 and 36 are provided with first and second regulators 33 and 34, respectively.

The valve unit 31 may be controlled according to a control signal for controlling the hydraulic pump provided from the control unit 100. [ More specifically, the hydraulic pump unit 30 is provided with an auxiliary pump, and the pilot hydraulic fluid discharged from the auxiliary pump is waiting upstream of the valve unit 31. [ When the control signal is input to the valve unit 31 from the control unit 100, the valve unit 31 is opened to supply the pilot hydraulic fluid to the first and second regulators 33 and 34, 33, and 34 adjust the swash plates of the first and second hydraulic pumps 35 and 36.

That is, a control signal for controlling the hydraulic pump is provided from the control unit 100, and the flow rate of the hydraulic fluid discharged from the hydraulic pump unit 30 can be controlled in accordance with the control signal.

In addition, the controller 100 may receive the actual engine speed provided from the engine speed sensor 20. The control unit 100 may calculate the current engine torque by adding or subtracting the estimated engine speed from the actual engine speed.

On the other hand, since the engine torque is directly transmitted to the hydraulic pump unit, the pump torque of the hydraulic pump unit is equivalent to the engine torque. That is, the pump torque can be estimated based on the estimated engine torque.

Similarly, the target pump torque can be calculated based on the target engine speed. The target pump torque is a pump torque that is implemented in the hydraulic pump unit 30. [

That is, the control unit 100 calculates and outputs the hydraulic pump control command so as to realize the target pump torque.

On the other hand, among the constituent parts of the engine 10, the plunger of the injector may be corroded or abraded by the moisture contained in the fuel. This allows the fuel to leak and the amount of fuel provided to the combustion chamber can be reduced, as shown in Figures 2 and 3, by the amount of fuel leaked. That is, the amount of fuel provided to the combustion chamber is reduced, so that the engine output will be reduced naturally.

Particularly, as shown in FIG. 3, the idle engine speed may show a steady state, but the rated engine speed falls below the target engine speed and stays in a region much lower than the target engine speed. That is, when actually performing the operation, the engine torque is lowered, which hinders the actual operation.

On the other hand, the engine 10 includes a governor, which is provided with a spring. The spring may be difficult to operate normally due to the aging of the engine, so that the actual engine speed can be made lower than the required engine speed although the specific engine speed is required, as shown in Fig.

Further, as shown in Fig. 5, when the parts such as the springs are worn, the idle engine revolutions are formed to be lower than the normal idle engine revolutions, and the engine revolutions are generally kept in a lowered state.

Particularly, as the difference between the target engine speed and the actual engine speed increases, the performance of the mechanical engine deteriorates more greatly.

Hereinafter, a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention will be described with reference to FIGS. 6 to 10. FIG.

6 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention, in which no correction is performed.

FIG. 7 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention, in which performance compensation is performed. 8 is a view for explaining a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention. Fig. 9 is a view for explaining an example of correcting the rated engine speed in Fig. 8; Fig. Fig. 10 is a diagram for explaining an example of correcting the engine output drop in Fig. 8. Fig.

6 (a), the control unit 100 receives a load mode selected in the instrument panel 90 and receives a voltage signal corresponding to the amount of opening of the throttle valve from the throttle valve sensor 80 . Further, the control unit 100 can receive the actual engine speed from the engine 10, more specifically, from the engine speed sensor 20.

The load mode can be selected in the instrument panel 90. The load mode can be divided into heavy load, standard load and light load depending on the expected load size including the auto idle mode. That is, when the load mode is selected, the engine rotation speed suitable for the load mode is automatically set. However, this means that the construction machine is not old and is in a normal state.

The control unit 100 includes a target engine speed calculation unit 110 and a pump control command calculation unit 120.

The target engine speed calculation unit 110 calculates a target engine speed according to an input voltage signal. Then, the pump control command calculation unit 120 performs PID (Proportional-Integral-Derivative) control so as to reduce the deviation by adding or subtracting the target engine speed and the actual engine speed.

On the other hand, the pump torque for the engine speed can be set in advance as a map. That is, the engine rotational speed obtained by the PID control can obtain the maximum pump torque that can be implemented in the hydraulic pump unit 30 by the map. The control unit 100 generates a pump control command for controlling the hydraulic pump unit 30 in accordance with the maximum pump torque. In addition, the control unit 100 controls the pump torque generated by the hydraulic pump unit 30 so as not to exceed the maximum pump torque described above. That is, in order to maintain the pump torque constant, the pump pressure is lowered when the discharge flow rate is increased, and the discharge flow rate is lowered when the pump pressure is increased.

FIG. 6 (b) shows the control range of the pump torque with time. The pump torque can control the pump torque within the range from the minimum pump torque to the maximum pump torque.

7 is a state in which performance compensation is performed by a controller for compensating performance of a construction machine according to an embodiment of the present invention. More specifically, as shown in FIG. 7A, before the hydraulic pump control command calculated by the controller 100 is supplied to the hydraulic pump unit 30, (200).

The pump torque correcting unit 200 described above compensates the pump torque when a large difference occurs between the estimated engine torque and the target engine torque.

More specifically, the estimated engine torque is gradually degraded as the mechanical engine ages. The pump torque correction unit 200 is configured to generate a corrected hydraulic pump control command so as to realize a pump torque that is lower than the target pump torque when the estimated engine torque reaches a level of 80% to 90% with respect to the target engine torque. The pump torque correction unit 200 controls the hydraulic pump unit 30 in response to the corrected hydraulic pump control command.

There is a case where there is a target engine torque expected by the user by setting the target engine speed, but the engine torque is lowered due to the deterioration of the engine speed due to the aging of the mechanical engine. In this case, the control device for compensating the performance of the construction machine according to the embodiment of the present invention controls the hydraulic pump unit 30 with the corrected hydraulic pump control command to prevent the engine speed from being drastically lowered, So that it can be maintained well.

On the other hand, the engine has a range for controlling the engine speed, and if the engine speed decreases within the control range, the engine torque increases in the engine control period, as can be seen from the engine dynamic characteristic diagram of Fig. As a result, the pump torque is increased by increasing the engine torque, so that the hydraulic pump unit 30 can achieve a good performance.

As shown in Fig. 7 (b), the corrected pump torque is set to a level lower than the maximum pump torque. As a result, the control range of the pump torque is from the minimum pump torque to the corrected pump torque.

Hereinafter, with reference to FIG. 8, characteristics of a control apparatus for performance compensation of a construction machine according to an embodiment of the present invention will be described. The controller for compensating the performance of the construction machine according to the embodiment of the present invention includes an engine speed compensation control unit 400, an engine output degradation compensation control unit 500, and a warning control unit 600, And the specific components may be common and are associated with each component.

First, the engine speed compensation control unit 400 will be described with reference to FIG. 9 (a). The control device for compensating the performance of the construction machine according to the embodiment of the present invention is configured such that when generating the corrected hydraulic pump control command by the pump torque correcting section 200, .

More specifically, as shown in FIG. 9A, the pump torque correction section 200 may include an engine revolution speed compensation control section 400.

The engine rotation speed compensation control unit 400 includes a condition determination unit 410, a delay unit 420, a filter unit 430 and an engine rotation ratio calculation unit 440, .

The condition determining unit 410 determines that the condition is satisfied if the working device is not operated and the running is stopped and the pump pressure of the hydraulic pump unit 30 is the pressure in the standby state. Further, the above conditions may further include those satisfied when the auto-idle mode is selected.

The condition determination unit 410 will be described in more detail. The condition determiner 410 receives the Pa pressure, the Pt pressure, the P1 pressure, the P2 pressure, and the auto idle mode selection.

Pa pressure is the pressure created when the joystick is moved, and it is the pilot pressure that is generated when operating the boom, arm, bucket, swing and optional equipment. That is, if the Pa pressure is " 1 ", the work device is not operated, and if the Pa pressure is " 0 "

The Pt pressure is the pressure that is generated when the construction machine runs, and it is judged whether or not the switch is operated for the running. When the Pt pressure is " 1 ", the running is stopped, and when the Pt pressure is " 0 "

The P1 pressure is a pump pressure formed by the first hydraulic pump 35 in the hydraulic pump provided in the hydraulic pump unit 30. [

The P2 pressure is a pump pressure formed by the second hydraulic pump 36 in the hydraulic pump provided in the hydraulic pump unit 30. [

The first and second hydraulic pumps 35 and 36 described above discharge a minimum amount of flow even if the hydraulic oil is not used in the hydraulic system. For example, the first and second hydraulic pumps 35 and 36 can be formed at a pump pressure of 50 bar or less. That is, when the pressure P1 and the pressure P2 are less than 50 bar, it is determined that the operation is not performed.

The auto idle mode is a function that automatically changes the engine speed according to the workload. An embodiment of the present invention is provided with an auto idle selection switch 412. More specifically, the auto idle selection switch 412 may be physically provided in the cabin, or may be configured to select on the menu display on the one hand.

In the embodiment of the present invention, "0", which is basically unselected in the auto-idle mode, is input in the auto-idle selection switch 412, and "1" is output when the auto-idle mode is selected.

As described above, the condition determining unit 410 determines whether the construction machine is in operation or running, whether the first and second hydraulic pumps 35 and 36 are in a standby state in the hydraulic pump unit 30, And the like.

If it is determined that all the conditions are satisfied in the condition determination unit 410, the subtraction engine rotation speed is calculated by subtracting the predetermined engine rotation speed reduction constant from the actual engine rotation speed.

Thereafter, the correction engine revolution speed is calculated by subtracting the reduction engine revolution speed from the target engine revolution speed, and a corrected hydraulic pump control command is generated based on the correction engine revolution speed. At this time, the generated corrected hydraulic pump control command controls the first and second hydraulic pumps 35 and 36 of the hydraulic pump unit 30.

Therefore, the control device for compensating the performance of the construction machine according to the embodiment of the present invention can be configured such that the construction machine is stopped without performing the work and can be performed in a stable state when generating the corrected hydraulic pump control command.

Further, the control device for compensating the performance of the construction machine according to the embodiment of the present invention may be calculated after the condition is satisfied in the condition determination unit 410, after the reduction engine revolution is delayed for the set delay time . The calculation of the subtracted engine speed is delayed, thereby preventing the engine speed from suddenly decreasing, thereby ensuring the stability of the construction machine.

Meanwhile, the controller for compensating the performance of the construction machine according to the embodiment of the present invention may have a set delay time of 0.5 to 1.5 seconds.

That is, if the delay is delayed by at least 0.5 second, the condition that the condition is satisfied in the condition determiner 410 described above can be more clearly implemented, and the impact due to the reduction in the engine speed can be prevented. In addition, since the number of revolutions of the engine is reduced within 1.5 seconds, it is possible to prevent the operation and operation of the construction machine from being excessively delayed.

On the other hand, in the control device for compensating the performance of the construction machine according to the embodiment of the present invention, when the condition is satisfied in the condition determiner 410, the actual engine speed is filtered, The number of revolutions of the subtracting engine may be calculated based on the number of rotations.

Actual engine speed is continuously changed in real time. Therefore, if the data of the actual engine speed is inputted, it is stabilized through filtering. The reduction engine speed can be calculated more accurately by calculating the reduction engine speed based on the stabilized stable engine speed.

On the other hand, the controller for compensating the performance of the construction machine according to the embodiment of the present invention may have an engine speed reduction constant of 130 rpm to 170 rpm.

The reduction factor of the engine speed can be expected to increase the engine torque by decreasing the engine speed to 130 rpm or more. On the other hand, if the engine speed reduction constant is reduced to 170 rpm or less, it is possible to prevent the engine from stalling in a range that can be accommodated by the fluctuation range of the engine speed in the engine.

FIG. 9 (b) shows the state immediately after the construction machine was released or immediately after the inspection, that is, when the mechanical engine was in good condition and in an aged state.

When the performance of the mechanical engine is good in FIG. 9 (b), the engine speed (see the ERN diagram) is good when the pump command value is input. However, if the mechanical engine is aged, the engine speed .

When the performance of the mechanical engine is good in FIG. 9 (b), the engine torque (refer to the ETN diagram) is high when the pump command value is input, and likewise the pump torque (see PTN diagram) , The engine torque (refer to the ETU diagram) is lowered and the pump torque (see the PTU diagram) is also lowered when the mechanical engine is aged.

In particular, when the hydraulic system is controlled by the pump power shift control (horsepower control), the engine speed is lower than the engine speed according to the pump torque command, thereby reducing the pump torque. Thereafter, as the engine speed decreases, the pump torque is controlled to be further reduced than the engine output is lowered. As a result, the construction machine does not exhibit normal performance.

That is, when the mechanical engine is aged, the engine output is lowered, and the pump torque is lowered, thereby degrading the work performance of the construction machine.

9C is an engine speed and a torque diagram showing the state in which the engine speed compensation control unit 400 is performed.

Referring to FIG. 9C, when the performance of the mechanical engine is deteriorated, the number of revolutions of the engine (see the ERU diagram) is implemented. When performance compensation control is performed, as can be seen from the corrected engine speed The command of the engine speed is lower than the previous engine speed (see ERU diagram).

In this case, the engine torque (refer to the ETU diagram) is low while the performance of the mechanical engine is low. However, if the performance compensation control is performed, the previous engine torque (refer to the ETU diagram) Lt; / RTI > That is, it prevents a situation in which the engine torque (see ETC diagram) is excessively reduced after the performance compensation control has been performed than when the engine torque was previously (see the ETU diagram).

Hereinafter, the engine output drop compensation control unit 500 will be described with reference to FIG. The engine output reduction compensation control unit 500 includes a hydraulic pump pressure determination unit 510, a filter unit 520, an accumulation unit 530, and a torque ratio calculation unit 540, as shown in FIG. .

The hydraulic pump pressure determination unit 510 determines whether the first and second hydraulic pumps 35 and 36 of the hydraulic pump unit 30 are in a standby state or whether the hydraulic oil is to be effectively discharged for an operation. The first and second hydraulic pumps 35 and 36 discharge a minimum amount of working oil without performing a substantial operation in the working device. At this time, the first and second hydraulic pumps 35 and 36 may be, for example, a value smaller than the set pressure. That is, if the pump pressure of the hydraulic pump unit 30 is lower than the set pressure, the hydraulic pump pressure determination unit 510 determines whether the pump is in a standby state without performing a substantial operation.

Thereafter, when the pump pressure of the hydraulic pump unit 30 is lower than the set pressure, the filter unit 520 filters the actual engine speed to obtain the stabilized engine speed. The actual engine speed is a value that changes in real time, and the graph of the actual engine speed may not be smooth. The filter unit 520 transforms the stable engine speed so that the smooth type of graph is drawn by filtering the actual engine speed.

Thereafter, the absolute value of the difference between the target engine speed and the stable engine speed is obtained every time, and the absolute value of the difference is accumulated. The cycle of each cycle can be set from several seconds to several minutes. Alternatively, the cycle of each cycle may be set in units of days, weeks, or months.

Then, the accumulated difference absolute value is divided by the time during which the difference absolute value is accumulated to obtain the average engine speed, and the pump torque limit value is calculated based on the average engine speed.

The engine power reduction compensation control unit 500 can generate the corrected hydraulic pump control command based on the pump torque limit value described above.

Meanwhile, the accumulated time may be from the time when the construction machine is released to the present time, or may be from the time when the construction machine is inspected to show normal performance to the present.

As described above, by obtaining the average engine speed, it is possible to grasp at which engine speed the work is normally performed by the construction machine. More specifically, even if the heavy load operation is performed intensively at a specific time, it is possible to reduce the weight of the absolute difference value so that the overall engine revolution in the past can be obtained and the reliability of the average engine revolution increases .

FIG. 10 (b) shows a state in which the mechanical engine has good performance and a state in which the engine performance is degraded. When the performance of the mechanical engine is good, it can be immediately after the construction machine is released or immediately after the inspection.

10 (b), when the performance of the mechanical engine is good, the engine speed drop phenomenon is good at the engine speed (see the ERN diagram). However, if the mechanical engine is aged, the engine speed The engine speed drop phenomenon is largely observed.

If the performance of the mechanical engine is good when the pump torque suddenly increases in Fig. 10 (b), the engine torque (refer to ETN diagram) is formed to be high and can cope with a sudden load. However, The engine torque (see ETU diagram) is reduced and the response to sudden load becomes poor.

10C is an engine speed and torque diagram showing the state in which the engine output reduction compensation control unit 500 is performed.

Referring to FIG. 10C, when the performance of the mechanical engine is deteriorated, the engine speed drops considerably as the engine speed (refer to the ERU diagram). However, when the performance compensation control is performed, the corrected engine speed The engine speed drop phenomenon is greatly improved as compared with the previous engine speed (see ERU diagram).

As a result, when the performance of the mechanical engine is deteriorated, the engine torque (refer to the ETU diagram) rises later and is restored. However, as shown by the corrected engine torque It stabilizes after the engine torque increases at the beginning of the torque (see ETU diagram). Particularly, when the performance compensation control is performed, the corrected engine torque (see ETC diagram) increases in the early stage but does not increase excessively, and the stabilized engine torque (refer to the ETC diagram) Can be formed to be low. Thus, the engine output degradation compensation control unit 500 of the control apparatus for compensating the performance of the construction machine according to the embodiment of the present invention can prevent the situation where the engine stall due to the lack of engine torque of the aged mechanical engine.

Hereinafter, the warning control unit 600 will be described with reference to FIGS. 11 to 13. FIG.

FIGS. 11 to 13 are diagrams for explaining a notification to a user when the performance of the mechanical engine has reached a limit to perform performance improvement by performing the correction.

As shown in FIG. 11, the difference between the target engine speed and the actual engine speed is evaluated and input from the engine speed-variation evaluating unit 300.

The engine speed difference evaluating unit 300 evaluates the difference between the target engine speed and the actual engine speed. As the aging of the mechanical engine progresses, the actual engine speed decreases.

Therefore, when the actual engine revolution speed reaches 70% to 80% with respect to the target engine revolution speed, the engine revolution speed variation evaluating section 300 judges that the degree of aging is serious and, as shown in FIG. 13, A warning message indicating that the engine check is recommended can be output.

That is, when the actual engine speed reaches 70% to 80% with respect to the target engine speed, it is determined that the engine aging has progressed to a considerably serious level, and the value range of 70% to 80% . That is, as the construction machine is normally used in a harsh environment, the ratio of the actual engine speed to the target engine speed can be set high. Conversely, when the construction machine is used in a low-load work environment as usual, the actual engine speed can be set to a low ratio with respect to the target engine speed.

In addition, the engine performance deterioration may determine the engine output decrease. That is, the target engine torque is obtained based on the target engine speed, and when the present engine torque reaches 70% to 80% with respect to the target engine torque, as shown in FIG. 13, A warning message can be output.

On the other hand, there may be a limit to performance compensation for degradation of engine performance due to aging of the mechanical engine. That is, even if the performance compensation is additionally performed, the performance compensation effect can not be expected or the engine may be damaged. In such a case, it may be wiser to check the engine and physically repair the engine.

Therefore, the control device for compensating the performance of the construction machine according to the embodiment of the present invention is to encourage the operator to check the engine before reaching the limit of performance compensation.

That is, when the present engine torque reaches 70% to 80% with respect to the target engine torque, it is judged that the engine has progressed to a considerably severe degree, and the numerical range of 70% to 80% can be reset according to the operator's will have. That is, as the construction machine is normally used in a harsh environment, the ratio of the current engine torque to the target engine torque can be set higher. Conversely, when the construction machine is normally used in a low-load working environment, the ratio of the current engine torque to the target engine torque can be set low.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims. The scope of the claims and their equivalents It is to be understood that all changes or modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

A control device for compensating performance of a construction machine according to an embodiment of the present invention is a construction machine in which a mechanical engine is mounted. When the output of the engine is lowered due to aging of the engine, Can be used to compensate for performance.

10: engine 12: shaft
20: engine speed detecting sensor 30: hydraulic pump unit
31: valve unit 33, 34: first and second regulators
35, 36: first and second hydraulic pumps
50: Engine control device 60: User engine speed setting unit
70: Linkage motor 80: Throttle valve sensor
90: Instrument cluster
100: control unit 110: target engine speed calculation unit
120: pump control command calculation unit 130: maximum pump torque limit unit
200: pump torque correcting unit 300: engine speed difference evaluating unit
400: engine speed compensation control unit 412: auto idle selection switch
500: engine power reduction compensation control section
600:

Claims (10)

A user engine speed setting unit (60) for setting a target engine speed;
A throttle valve sensor 80 for outputting a voltage signal in accordance with the amount of opening of the throttle valve;
Calculating a target engine torque based on the target engine speed, calculating an estimated engine speed according to the voltage signal, calculating an estimated engine torque based on the estimated engine speed, calculating a target corresponding to the target engine torque A control unit (100) for calculating a hydraulic pump control command for implementing pump torque; And
Generates a corrected hydraulic pump control command so as to realize a pump torque that is lower than the target pump torque when the estimated engine torque reaches a level of 80% to 90% with respect to the target engine torque, A pump torque correction unit (200) for controlling the hydraulic pump unit;
And a controller for compensating performance of the construction machine.
The method according to claim 1,
The pump torque correcting unit 200,
If the condition that the working device is not operated and the running is stopped and the pump pressure of the hydraulic pump unit 30 is the pressure in the standby state is satisfied,
Calculates a reduction engine revolution number by subtracting a predetermined engine revolution reduction constant from the actual engine revolution number,
Calculates a correction engine revolution number by subtracting the reduction engine revolution number from the target engine revolution number,
And generating the corrected hydraulic pump control command based on the correction engine revolution speed
And a controller for compensating performance of the construction machine.
3. The method of claim 2,
When the auto idle selection switch 412 is turned on (On) and the auto idle mode is selected
And a control unit for controlling the performance of the construction machine.
3. The method of claim 2,
The number of revolutions of the subtracting engine is calculated after being delayed for the set delay time
And a controller for compensating performance of the construction machine.
5. The method of claim 4,
The set delay time is 0.5 to 1.5 seconds
And a controller for compensating performance of the construction machine.
5. The method according to any one of claims 2 to 4,
The actual engine speed is filtered and the reduction engine speed is calculated based on the stabilized engine speed.
And a controller for compensating performance of the construction machine.
3. The method of claim 2,
Wherein the engine speed reduction constant is 130 rpm to 170 rpm
And a controller for compensating performance of the construction machine.
The method according to claim 1,
The control unit (100)
If the pump pressure of the hydraulic pump unit 30 is higher than the set pressure,
The stabilized engine speed is obtained by filtering the actual engine speed,
Accumulating absolute difference values between the target engine speed and the stable engine speed every time,
An average engine speed is obtained by dividing the accumulated difference absolute value by the time during which the difference absolute value is accumulated,
Calculates a pump torque limit value based on the average engine speed,
Generating the corrected hydraulic pump control command based on the pump torque limit value
And a controller for compensating performance of the construction machine.
The method according to claim 1,
The control unit (100)
A target engine torque is obtained on the basis of the target engine speed,
When the current engine torque reaches 70% to 80% with respect to the target engine torque, a warning message indicating that the engine check is recommended to the instrument panel 90 is output
And a controller for compensating performance of the construction machine.
The method according to claim 1,
The control unit (100)
When the actual engine speed reaches 70% to 80% with respect to the target engine speed, a warning message indicating that engine check is recommended to the instrument panel 90 is output
And a controller for compensating performance of the construction machine.

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