KR20140079569A

KR20140079569A - Fault diagnosis device and method for the cooling system of Hybrid construction machinery

Info

Publication number: KR20140079569A
Application number: KR1020120147161A
Authority: KR
Inventors: 김광운
Original assignee: 두산인프라코어 주식회사
Priority date: 2012-12-17
Filing date: 2012-12-17
Publication date: 2014-06-27
Also published as: KR102031368B1

Abstract

The present invention relates to a fault diagnosis device and method of a water cooling system for hybrid construction machinery. The fault diagnosis device including a water pump (20) driven by electricity; a current sensor (22) measuring an actual current value of the water pump (20); a circulation pipeline (60) through which cooling water circulates a target apparatus (40) to be cooled by the operation of the water pump (20); a radiator (50) disposed at the circulation pipeline (60) to cool the cooling water; a cooling fan (52) supplying wind to the radiator (50) so that the radiator (50) radiates the heat; and a control unit (70) receiving the actual current value from the current sensor (22), and determining that the water pump is abnormal if an event in which the actual current value is equal to or more than a highest current value exceeds a predetermined number in sequence, or determines that the flow rate of the cooling water is not sufficient, and the pipeline is abnormal if an event in which the actual current value is less than a lowest current value exceeds a predetermined number in sequence.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault diagnosis apparatus and method for a water cooling system for a hybrid construction machine,

The present invention relates to an apparatus and method for diagnosing an abnormality in a water cooling system for a hybrid construction machine, and more particularly, to a system and method for diagnosing an abnormality in a water cooling system for a hybrid construction machine, And more particularly, to an apparatus and method for anomaly diagnosis of a water cooling system for a machine.

Generally, the hybrid construction machine is composed of power converter, ultracapacitor, power and regenerative motor. Further, the hybrid construction machine is provided with a water cooling system separate from the cooling system of the engine. The water cooling system comprises a water pump and a radiator, a fan, a cooling line, and the like.

A conventional water cooling system will be described with reference to Fig. 1 is a view for explaining a water cooling system of a hybrid construction machine.

1, the conventional water cooling system operates the water pump 20 by using the power of the battery 10, and the water pump 20 sucks the cooling water from the cooling water reservoir tank 30, The cooling target device 40 is circulated along the cooling device 60.

The circulation duct 60 is provided with a radiator 50 and the radiator 50 is provided with a cooling fan 52. That is, the cooling water is cooled by the action of the radiator 50 and the cooling fan 52.

The cooling water is heat-exchanged via the cooling object device 40, and the cooling object device 40 is cooled by such heat exchange.

The cooling target device 40 may be, for example, an energy storage device, an inverter / converter, an electric motor, or the like. Each of the cooling object devices 40 described above is provided with a temperature sensor to detect the respective temperature values T1, T2 and T3 and the detected temperature values T1, T2 and T3 to the controller 70 / RTI >

During the operation of the hybrid construction machine, heat is generated in the cooling object device 40, and if such heat is overheated, it may cause a failure. Therefore, it should be cooled to a temperature within the allowable range to maintain the proper temperature.

Each of the detected temperature values T1, T2, and T3 described above is sent to the controller, and water cooling is performed by operating the water pump 20 before reaching the upper limit temperature allowed by each of the cooling target devices 40 .

That is, the conventional water cooling system is controlled in accordance with the temperature of each of the cooling object devices 40, and more specifically, the water cooling system is activated or deactivated so as to efficiently use the energy.

On the other hand, when each of the detected temperature values (T1, T2, T3) exceeds the allowable temperature, the cooling target device 40 is diagnosed as having an abnormality.

However, in the conventional water cooling system, when the problems such as the failure of the water pump, the shortage of the cooling water, the clogging of the circulation duct (piping), the deterioration of the radiator performance and the abnormality of the cooling fan occur, There is a problem in that it is impossible to diagnose an abnormality occurring in the components of the apparatus.

On the other hand, since the cooling performance is lost when the cooling water circulation failure as described above occurs, it is necessary to recover the water cooling system quickly, but it is difficult to diagnose which part has caused the abnormality and it is difficult to recover the water cooling system have.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cooling system for a hybrid construction machine, in which, when there is a possibility that a cooling water circulation failure may occur due to a water pump abnormality, a cooling water shortage / pipe clogging, a radiator abnormality, The present invention provides an apparatus and method for diagnosing an abnormality in a water cooling system for a hybrid 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 an apparatus and method for diagnosing an abnormality in a water cooling system for a hybrid construction machine, including: a water pump (20) driven by electricity; A current sensor 22 for measuring an actual current value of the water pump 20; A circulation duct (60) for circulating cooling water through the cooling object device (40) by driving the water pump (20); A radiator (50) disposed in the circulation duct (60) and cooling the cooling water to heat-exchange with the cooling water; A cooling fan (52) for applying heat to the radiator (50) to dissipate heat of the radiator (50); And an actual current value from the current sensor (22), and diagnoses a water pump abnormality if an event that the actual current value exceeds a current upper limit value exceeds a predetermined number of consecutive times, (70) for diagnosing a shortage of the cooling water flow rate and an abnormality of the pipeline if the number of times of the event that the value is less than the set number of consecutive times.

In the abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to the present invention, the abnormality diagnosis device for a water cooling system for a hybrid construction machine is arranged at the inlet side of the radiator (50) to measure the temperature of the cooling water, A sensor 54; And an outlet temperature sensor (55) disposed on an outlet side of the radiator (50) to measure the temperature of the cooling water and provided to the controller (70), and the controller (70) The first average temperature value T4 is calculated based on the temperature value provided from the sensor 54 and the second average temperature value T5 is calculated based on the temperature value provided from the outlet temperature sensor 55, If the average temperature value T4 is smaller than the second average temperature value T5, the abnormality diagnosis may be made for any one of the radiator 50 and the cooling fan 52.

The control unit 70 of the abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to the present invention diagnoses the abnormality of the radiator 50 when the water pump 20 is abnormal, It may be diagnosed that the cooling fan 52 is abnormal.

The control unit 70 of the abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to the present invention may be configured such that the first average temperature value T4 and the second average temperature value T5 are within an allowable error range If it is the same, the radiator 50 and the cooling fan 52 may be abnormally diagnosed.

If the first average temperature value T4 and the second average temperature value T5 are different within an allowable error range, the controller 70 of the abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to the present invention The water cooling system can be diagnosed by a complete check.

According to another aspect of the present invention, there is provided a method for diagnosing an abnormality in a water cooling system for a hybrid construction machine, the method comprising: monitoring a current value of a current provided to the water pump; A water pump abnormality determination step (S130) of determining whether the event in which the actual current value is detected to exceed the current upper limit value continuously exceeds the predetermined number in the current value monitoring step (S120); And when the number of events in which the actual current value of the water pump (20) exceeds the current upper limit value in the water pump failure step (S130) exceeds a predetermined number of consecutive times, the water pump (20) And a water pump abnormality diagnosis display step (S132) for diagnosing and displaying the water pump abnormality.

Also, in the abnormality diagnosis method for a water cooling system for a hybrid construction machine according to the present invention, in the current value monitoring step (S120), the current value monitoring period is 10 ms to 1 s, and the set number of times is 3 to 5 have.

The method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention may further comprise the step of monitoring the current value (S120) or the abnormality determination step (S130) A coolant flow rate and channel abnormality determination step (S140) for determining whether an event in which an actual current value is detected to be less than a current lower limit value exceeds a predetermined number of times consecutively; And when the actual current value of the water pump (20) is below the current lower limit value in the cooling water flow rate and pipeline abnormality determination step (S140), if the number of events to be recorded exceeds the predetermined number of consecutive times, And displaying the cooling water flow rate and the management abnormality (S142).

In addition, a method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention includes: a waiting step (S110) for waiting for a standby time set after activating a hybrid construction machine before the current value monitoring step (S120); As shown in FIG.

In the method for diagnosing an abnormality in a water cooling system for a hybrid construction machine according to the present invention, the set waiting time may be 5 to 10 minutes.

According to another aspect of the present invention, there is provided a method for diagnosing an abnormality in a water cooling system for a hybrid construction machine, comprising the steps of: monitoring a temperature value of cooling water passing through a radiator (50) ); The average temperature value T5 is calculated by calculating the first average temperature value T4 as the inlet temperature value of the radiator 50 and the second average temperature value T5 as the outlet temperature value of the radiator 50 in the cooling water temperature monitoring step S210 A temperature value calculation step S220; A first cooling water system determination step (S230) for comparing and determining the first average temperature value (T4) and the second average temperature value (T5) detected in the average temperature value calculation step (S220); If the first average temperature value T4 is larger than the second average temperature value T5 within the tolerance range in the first cooling water system determination step S230, the cooling water system normal display step S232; A second cooling water system determination step (S240) for determining whether the first average temperature value (T4) is smaller than the second average temperature value (T5) within the tolerance range after the first cooling water system determination step (S230); After the second cooling water system determination step S240, if the first average temperature value T4 is less than the second average temperature value T5 within the tolerance range, it is determined whether the water pump 20 is operating normally Water pump function normal determination step S250; A radiator abnormality display step (S252) of diagnosing and indicating that the radiator (50) is abnormal if the water pump (20) does not function normally in the water pump function normal determination step (S250); And a cooling fan abnormality display step (S254) for diagnosing and displaying that the cooling fan (52) is abnormal if the water pump (20) normally functions in the normal water pump function determination step (S250).

In the method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention, in the cooling water temperature monitoring step (S210), a period for monitoring the cooling water temperature value is 0.5s to 1.5s, The number of times may be two to four times.

The method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention may further comprise the step of determining a first average temperature value T4 and a second average temperature value T4 within a tolerance range after the second cooling water system determination step S240, A third cooling water system determination step (S260) for determining whether the value (T5) is equal to the value If the first average temperature value T4 and the second average temperature value T5 are equal to each other in the third cooling water system determination step S260, the radiator and the cooling fan abnormality diagnosis for diagnosing the abnormality of the radiator 50 and the cooling fan 52 Step S262; And in the third cooling water system determination step (S260), if it is determined that the first average temperature value (T4) and the second average temperature value (T5) are different from each other, ; &Lt; / RTI >

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

The apparatus and method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention as described above are suitable for use in a water cooling system in which components of a water cooling system include a water pump abnormality, a cooling water shortage / pipe clogging, a radiator abnormality, If there is a possibility of failure, that is, if an abnormality occurs, it is possible to quickly diagnose which component is detected in which component, and thereby, it is possible to specify the component in which the abnormality occurs, It is possible to prevent overheating due to heat.

1 is a view for explaining a water cooling system of a hybrid construction machine.
2 is a view for explaining an abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to an embodiment of the present invention.
3 and 4 are views for explaining an abnormality diagnosis of a water pump, cooling water, and pipeline in an apparatus and method for abnormality diagnosis of a water cooling system for a hybrid construction machine according to an embodiment of the present invention.
5 and 6 are views for explaining an abnormality diagnosis of a radiator and a cooling fan in an apparatus and method for abnormality diagnosis of a water cooling system for a hybrid construction machine according to an embodiment of the present invention.

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.

Like reference numerals refer to like elements throughout the specification, and like elements to those of the prior art are denoted by the same reference numerals, and a detailed description thereof will be omitted.

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.

Hereinafter, an abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to an embodiment of the present invention will be described with reference to FIG.

2 is a view for explaining an abnormality diagnosis apparatus for a water cooling system for a hybrid construction machine according to an embodiment of the present invention.

As shown in Fig. 2, power is applied to the water pump 20, and a current sensor 22 for detecting a current value is provided on the power supply line. The water pump 20 may be provided with the electric current sensor 22 described above on the power line to which the water pump 20 and the battery 10 are connected because the electric power is supplied from the battery 10.

The current value detected by the current sensor 22 is provided to the controller 70. [ The period for detecting the current value in the current sensor 22 may be set in advance. The set period value may be 10 ms to 1 s. For example, when the period value is set to 1s, the current value is detected every one second and the current value is provided to the controller 70.

An inlet temperature sensor 54 and an outlet temperature sensor 55 are provided at the inlet and outlet sides of the radiator 50, respectively. The inlet temperature sensor 54 and the outlet temperature sensor 55 detect the cooling water temperature and are provided to the control unit 70. [

The control unit 70 calculates the first temperature value T4 by calculating the temperature value detected by the inlet temperature sensor 54 as an average temperature per unit time.

Further, the control unit 70 calculates the temperature value detected by the outlet temperature sensor 55 as the average temperature per unit time, and calculates the second average temperature value T5.

On the other hand, the cooling object device 40 is provided with a temperature sensor for each device, and the respective temperature values T1, T2 and T3 are detected, and the temperature values T1, T2 and T3 are provided to the control unit 70 Diagnose whether the specific device is overheated.

When overheating is expected or overheated in a specific apparatus, the operation and stoppage of the water pump 20 are controlled to circulate the cooling water, thereby preventing the cooling object device 40 from overheating.

First, with reference to FIGS. 3 and 4, a method for diagnosing an abnormality of a water pump, cooling water, and pipeline by a method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to the present invention will be described.

FIG. 3 and FIG. 4 are views for explaining an abnormality diagnosis of a water pump, cooling water, and pipeline in an abnormality diagnosis apparatus and method for a water cooling system for a hybrid construction machine according to an embodiment of the present invention.

In the method for diagnosing an abnormality in a water cooling system according to an embodiment of the present invention, monitoring is started to see if there is an abnormal symptom while the hybrid construction machine is started. When an abnormal symptom occurs, the part diagnoses an abnormal symptom.

In other words, the current value provided to the water pump 20 is detected by the current sensor 22 and compared with the rated pump current to diagnose an abnormal symptom.

The fault detection standard is whether or not the rated pump current is stabilized with time as shown in FIG. 3 (a). If the current value falls below the current lower limit value, it means that there is a shortage of cooling water flow rate and pipeline abnormality. If the current value is lower than the current lower limit value, .

The upper current limit value can be set to + 30% to the value of the rated pump current. Also, the lower current limit value can be set to -30% to the value of the rated pump current.

As described above, the current upper limit value and the current lower limit value are set to the rated pump current value from -30% to + 30%, and this range is set to the tolerance range. The reason for this is that there is a variation in each electric and electronic product, and there is a tolerance according to the power state of the applied equipment or the applied vehicle.

The water pump fault diagnosis will be described below for each step.

Waiting step (S110): Wait for the set waiting time after starting the hybrid construction machine. This is to monitor the water pump current value for the section of operation of the actual equipment, except for the initial start-up. The waiting time can be set to 5 to 10 minutes, and the waiting time setting can be changed differently depending on the equipment age or the ambient temperature.

On the other hand, when the waiting time has not elapsed, the waiting step (S110) is repeated, and after the waiting time has elapsed, the process proceeds to the next step.

Current value monitoring step S120: Monitoring the current value of the current supplied to the water pump 20 after the waiting step S110. The monitoring period may be set to 10 ms to 1 s.

If the current value monitoring period is more than 10ms, the detected current value can be utilized as data. In other words, if the monitoring period is 10 ms or less, too much data is generated, so that the control unit 70 may delay the calculation or increase the load. However, if the monitoring period is 10 ms or more, the abnormality of the water pump 20 is judged The data can be used as data on the basis of.

If the current value monitoring period is less than 1s, the detected current value can be utilized as data. In other words, if the monitoring period is 1 s or more, the current value may be frequently changed at any time. Data that is relatively insensitive to the change may be generated. Therefore, when the monitoring period of the current value is 1 s or less, As the data of the basis for judging whether or not there is a problem.

Water pump abnormality determination step (S130): In the current value monitoring step (S120), it is determined whether an event in which the actual current value is detected to exceed the current upper limit value is continuously exceeded the set number of times.

The above-mentioned event means that the current upper limit value is exceeded or the current lower limit value is not satisfied.

The above-described set number of times may be set from 3 times to 5 times. If the set number of times is more than three times, it is considered to be reliable. In other words, when one or two events occur, there may be a case where noise or interference occurs or a temporary phenomenon occurs, and there is a case where the event returns to normal soon. For this reason, except for noise or temporary phenomenon, it is used to diagnose abnormality of water pump when it is detected more than 3 times to distinguish it from data to be verified.

Further, when the above-mentioned predetermined number of times is detected up to five times, it is apparent that there is an abnormal symptom in the water pump, so that it may be sufficient to diagnose the abnormality of the water pump.

Water pump abnormality diagnosis display step (S132): In this step, the number of events in which the actual current value of the water pump (20) exceeds the current upper limit value in the water pump abnormality step (S130) The water pump 20 diagnoses that there is an abnormality and displays it as means by which the instrument panel or the operator perceives it. Perceptual means may include warning beeps, warning lights, and the like.

On the other hand, it can be understood that the reason why the actual current value of the water pump 20 suddenly rises is that the water pump 20 is overloaded. That is, there is an indication that an abnormality occurs in the water pump, and if this situation persists, it means that the water pump 20 can not perform normal operation.

If the number of events in which the actual current value of the water pump 20 exceeds the upper limit value in the water pump abnormality step S130 described above does not exceed the predetermined number of times consecutively, It is diagnosed that there is not.

Since the water pump 20 has no abnormality, the dashboard may be displayed as a general situation or may not be marked.

In step S140, it is determined whether the actual current value is less than the current lower limit value in the current value monitoring step S120. In addition, the cooling water flow rate and channel abnormality determination step S140 may be performed after the above-described water pump abnormality determination step (S130).

(Step S142): In this step, the number of events in which the actual current value of the water pump 20 is lower than the lower limit value of the current in the cooling water flow rate and pipe abnormality determination step (S140) If the set number of times is exceeded, it is diagnosed that there is a shortage of coolant flow and an abnormality of pipeline, and it is indicated as means by which the instrument panel or operator can perceive. Perceptual means may include warning beeps, warning lights, and the like.

On the other hand, it can be understood that the reason why the actual current value of the water pump 20 suddenly falls is that the light load under the reference is applied to the water pump 20. That is, it can be understood that the water pump 20 operates normally to circulate the cooling water, but it is understood that the actual cooling water flows insufficiently, and if this situation persists, there is an abnormal symptom in the circulation line 60.

Meanwhile, if the actual current value of the water pump 20 in the above-described water pump abnormality determination step S130 and the above-described cooling water flow rate and pipeline abnormality determination step S140 is smaller than the current upper limit value as shown in FIG. If it is detected between the current lower limit value, it is diagnosed as a normal state. If the normal state is diagnosed, the current value monitoring step (S120) continues to monitor the actual current value of the water pump (20).

On the other hand, if the actual current value of the water pump 20 in the above-described water pump abnormality determination step S130 and the above-described cooling water flow rate and pipeline abnormality determination step S140 is smaller than the current upper limit value And when the event exceeding the current lower limit value occurs, the number of occurrences of the event is used as data to diagnose the water pump abnormality when the current upper limit value is exceeded. If the current lower limit value is not satisfied, Diagnosis.

Hereinafter, a method for diagnosing an abnormality of the radiator and the cooling fan by the abnormality diagnosis method of the water cooling system for a hybrid construction machine according to the present invention will be described with reference to FIGS. 5 and 6.

5 and 6 are views for explaining an abnormality diagnosis of a radiator and a cooling fan in an apparatus and method for abnormality diagnosis of a water cooling system for a hybrid construction machine according to an embodiment of the present invention.

An inlet temperature sensor 54 is provided at the inlet side of the radiator 50 to receive cooling water. A temperature value is detected from the temperature sensor 54 and provided to the control unit 70.

An outlet temperature sensor 55 is provided at the outlet of the radiator 50 to discharge the cooling water. A temperature value is detected from the outlet temperature sensor 55 and supplied to the controller 70.

The control unit 70 diagnoses the abnormality of the radiator, the clogging of the circulation pipe (pipe) 60, and the cooling fan abnormality by using the change of the temperature value provided from the inlet temperature sensor 54 and the outlet temperature sensor 55 described above.

The following explains how to diagnose the abnormality of the radiator and cooling fan in each step.

Waiting step (S110): Wait for the set waiting time after starting the hybrid construction machine. This is to monitor the temperature value of the cooling water for the section where the actual equipment is operated except for the initial start-up. The waiting time can be set to 5 to 10 minutes, and the waiting time setting can be changed differently depending on the equipment age or the ambient temperature.

Cooling water temperature monitoring step S210: Monitoring the temperature value of the cooling water via the radiator 50 after the waiting step S110. The temperature value of the cooling water is measured at the inlet side where the cooling water enters the radiator 50 and at the outlet side where the cooling water is discharged, respectively. The coolant temperature monitoring period can be set to 0.5 s to 1.5 s.

If the monitoring period is over 0.5s, the detected temperature value can be used as data. In other words, if the monitoring period is 0.5s or less, too much data is generated, so that the control unit 70 may delay the calculation or increase the load. However, if the monitoring period is 0.5s or more, the radiator 50, It can be utilized as data of a basis for judging an abnormal symptom of the duct 60.

Also, if the monitoring period is 1.5s or less, it means that the detected temperature value is sufficiently secured as data. That is, it may be a suitable range in which the temperature value measured before and the temperature value measured later are not changed extreme.

Further, the monitoring number of the cooling water temperature value may be 2 to 4 times. That is, since the temperature value which temporarily increases or decreases rapidly can not be relied upon, it is necessary to repeatedly measure the cooling water temperature value of the radiator at a plurality of times to provide a basis for calculating the average value. This minimizes errors due to interference or noise, thereby improving the reliability of the diagnostic basis.

The average temperature value calculation step S220 calculates a first average temperature value T4 as the inlet temperature value of the radiator 50 provided to the controller 70 in the cooling water temperature monitoring step S210. Also, the second average temperature value T5 is calculated based on the outlet temperature value of the radiator 50.

That is, the cooling water temperature at the inlet of the radiator 50 and the cooling water temperature at the outlet of the radiator 50 are calculated as an average value.

The first cooling water system determination step S230 is a step of comparing and comparing the first average temperature value T4 and the second average temperature value T5 detected in the average temperature value calculation step S220.

Cooling water system normal display step S232: If the first average temperature value T4 is larger than the second average temperature value T5 within the tolerance range in the first cooling water system determination step S230, it is determined to be normal. The reason for the determination as normal will be described with reference to Fig. 5 (a).

The monitoring period of the temperature change of the cooling water is, for example, about 1 second, and the temperature value is applied to the interval average for 2 seconds. That is, when the monitoring is performed three times, the temperature value measured at the time of tn-1, tn, tn + 1 is taken and the average of the three temperature values is calculated.

The monitoring period of the temperature change of the cooling water may vary depending on the temperature characteristics of the water cooling system.

The inlet inflow temperature T4 of the radiator 50 is kept higher than the outlet inflow temperature T5 by a predetermined temperature or more when the radiator 50 normally performs the heat radiation function.

In addition, the temperature difference between the inlet and the outlet of the radiator 50 may vary. 5 (a), it is assumed that the radiator 50 is installed at the time of preceding monitoring, assuming that the flow rate of the cooling water decreases or the air flow rate of the cooling air decreases due to the passage of time of operating the hybrid construction machine. The difference between the inlet temperature of the radiator 50 and the outlet temperature of the radiator may be small (see a), and the difference between the inlet temperature of the radiator 50 and the outlet temperature of the radiator may be small (see FIG.

However, the absolute temperature difference may be reduced, but still the entrance inflow temperature T4 of the radiator 50 is kept higher than the outlet outflow temperature T5 by a certain temperature or more.

Therefore, when the flow rate of the radiator 50, the cooling fan 52, and the cooling water is normal, the inlet temperature is a little higher than the outlet temperature, and the constant temperature difference is a basis for determining that the temperature is steady during the operation requiring cooling .

Second cooling water system determination step S240: After the first cooling water system determination step S230, it is determined whether the first average temperature value T4 is less than the second average temperature value T5 within the tolerance range .

If the first average temperature value T4 is less than the second average temperature value T5 within the tolerance range after the second cooling water system determination step S240, (20) is operating normally. If the water pump 20 is normal, it means that the cooling water circulates normally.

Radiator abnormality display step S252: If the water pump 20 does not function normally in the water pump function normal determination step S250, the radiator 50 is diagnosed as having an abnormality, do.

In other words, as shown in Fig. 5 (b), the outlet temperature of the radiator 50 may be higher than the outlet temperature. It can be understood that the amount of heat input from the outside is larger than the amount of heat radiation. That is, when the circulation of the cooling water is not normal and the circulation of the cooling water is stagnated, there is no amount of heat released by the cooling water, so the temperature of the stopped cooling water should not change. It is diagnosed that an abnormality has occurred in the radiator 50 based on this.

Cooling fan abnormality display step S254: If the water pump 20 normally functions in the water pump function normal determination step S250, the cooling fan 52 diagnoses that there is an abnormality, .

In other words, as shown in FIG. 5B, the outlet temperature of the radiator 50 may be higher than the inlet temperature. It can be understood that the amount of heat input from the outside is larger than the amount of heat radiation. Even if the circulation of the cooling water is normal, it is the case that heat is input from the outside. There is continuous heat inflow from the outside, and heat is absorbed rather than heat due to cooling water. It can be understood that the cooling fan 52 does not properly dissipate heat, but rather has a heat input. Therefore, it is diagnosed that an abnormality has occurred in the cooling fan 52 based on this.

The third cooling water system determination step S260 includes determining whether the first average temperature value T4 and the second average temperature value T5 are equal to each other within the tolerance range after the second cooling water system determination step S240 to be.

Radiator and cooling fan abnormality display step S262: If the first average temperature value T4 and the second average temperature value T5 are equal in the third cooling water system determination step S260, the radiator 50 and the cooling fan 52 ) Or more.

As shown in FIG. 5 (c) of the accompanying drawings, when the inlet and outlet temperatures of the radiator are the same within the allowable tolerances, it can be understood that there is no heat inflow in a state in which heat is not radiated, or a case where the heat radiation amount and the heat inflow amount are the same have. That is, it can be seen that the cooling function is not performed at all and based on this, it is diagnosed that the radiator is abnormal or the cooling fan is abnormal.

Water cooling system total watering check display step (S264): If the first average temperature value (T4) and the second average temperature value (T5) are different in the third cooling water system determination step (S260), it is impossible to diagnose. This means that the entire water cooling system should be checked because it is impossible to specify exactly which part there is more than one line. Allow the driver to perceive.

As described above, the apparatus and method for diagnosing an abnormality of a water cooling system for a hybrid construction machine according to an embodiment of the present invention are characterized in that when an abnormality occurs in an element constituting a water cooling system or an abnormality occurs, And informs the driver of the occurrence of the accident.

In particular, when an abnormal symptom appears, it is possible to prevent a failure of a specific component in advance, thereby making it possible to improve the operation efficiency of the equipment by preventing the operation of the construction machine.

In addition, a real-time failure detection method for failure of the water pump 20 or abnormality of the radiator, clogging of the circulation duct 60 (piping), abnormality of the cooling fan 52,

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.

An apparatus and method for diagnosing an abnormality in a water cooling system for a hybrid construction machine according to the present invention is characterized in that when an abnormality occurs in an element constituting a water cooling system or when an abnormality occurs, Can be used.

10: Battery
20: Water pump 22: Current sensor
30: Cooling water reservoir tank
40: Device to be cooled
50: radiator 52: cooling fan
54: inlet temperature sensor 55: outlet temperature sensor
60: circulation duct
70:

Claims

A water pump 20 driven by electricity;
A current sensor 22 for measuring an actual current value of the water pump 20;
A circulation duct (60) for circulating cooling water through the cooling object device (40) by driving the water pump (20);
A radiator (50) disposed in the circulation duct (60) and cooling the cooling water to heat-exchange with the cooling water;
A cooling fan (52) for applying heat to the radiator (50) to dissipate heat of the radiator (50); And
If the event that the actual current value exceeds the current upper limit value exceeds the predetermined number of consecutive times, the water pump diagnosis is made, and if the actual current value is less than the current lower limit value The control unit 70 diagnoses that there is a shortage of the cooling water flow rate and an abnormality of the pipeline if the number of times that the number of times of the event is less than the predetermined number of times.
An abnormality diagnosis device for a water cooling system for a hybrid construction machine

The method according to claim 1,
An inlet temperature sensor 54 disposed at an inlet side of the radiator 50 to measure the temperature of the cooling water and measuring the measured temperature value, the inlet temperature sensor 54 being provided to the controller 70; And
And an outlet temperature sensor (55) disposed at an outlet side of the radiator (50) to measure the temperature of the cooling water and to provide the measured temperature value to the controller (70)
The control unit 70 calculates a first average temperature value T4 based on the temperature value provided from the inlet temperature sensor 54 and calculates a second average temperature value T4 based on the temperature value provided from the outlet temperature sensor 55 And diagnoses abnormally any one of the radiator (50) and the cooling fan (52) if the first average temperature value (T4) is smaller than the second average temperature value (T5) Fault diagnosis equipment for water cooling systems for machines.

3. The method of claim 2,
The control unit (70)
When the water pump 20 is abnormal, the radiator 50 is diagnosed as abnormal,
And diagnoses the abnormality of the cooling fan (52) when the water pump (20) is normal.

3. The method of claim 2,
The control unit (70)
Wherein the controller diagnoses the radiator (50) and the cooling fan (52) abnormally if the first average temperature value (T4) and the second average temperature value (T5) Abnormality diagnosis apparatus for water cooling system.

3. The method of claim 2,
The control unit (70)
If the first average temperature value (T4) and the second average temperature value (T5) are different from each other within an allowable error range, diagnosis is made based on a total water cooling system check.

A current value monitoring step (S120) of monitoring a current value of a current provided to the water pump (20);
A water pump abnormality determination step (S130) of determining whether the event in which the actual current value is detected to exceed the current upper limit value continuously exceeds the predetermined number in the current value monitoring step (S120); And
If the number of events in which the actual current value of the water pump 20 exceeds the current upper limit value in the water pump abnormality step S130 exceeds the predetermined number of consecutive times, the water pump 20 is abnormal Water pump abnormality diagnosis display step (S132);
And a method for diagnosing an abnormality in a water cooling system for a hybrid construction machine.

The method according to claim 6,
In the current value monitoring step (S120)
Wherein the current value monitoring period is 10 ms to 1 s, and the predetermined number of times is 3 to 5 times.

The method according to claim 6,
After the current value monitoring step S120 or the water pump abnormality determination step S130,
A cooling water flow rate and channel abnormality determination step (S140) for determining whether an event in which the actual current value is less than the current lower limit value is continuously exceeded the predetermined number of times in the current value monitoring step (S120); And
If the actual current value of the water pump 20 is below the current lower limit value in the cooling water flow rate and pipeline abnormality determination step (S140), if the number of events to be recorded exceeds the predetermined number of consecutive times, A cooling water flow rate and a management abnormality display step (S142);
Further comprising the steps of: (a)

The method according to claim 6,
Before the current value monitoring step (S120)
A waiting step (S110) for waiting for a set waiting time after starting the hybrid construction machine;
Further comprising the steps of: (a)

10. The method of claim 9,
Wherein the set waiting time is 5 minutes to 10 minutes. &Lt; RTI ID = 0.0 > 18. < / RTI >

A cooling water temperature monitoring step (S210) of monitoring the temperature value of the cooling water passing through the radiator (50) by a predetermined number of times and a predetermined number of times;
The average temperature value T5 is calculated by calculating the first average temperature value T4 as the inlet temperature value of the radiator 50 and the second average temperature value T5 as the outlet temperature value of the radiator 50 in the cooling water temperature monitoring step S210 A temperature value calculation step S220;
A first cooling water system determination step (S230) for comparing and determining the first average temperature value (T4) and the second average temperature value (T5) detected in the average temperature value calculation step (S220);
If the first average temperature value T4 is larger than the second average temperature value T5 within the tolerance range in the first cooling water system determination step S230, the cooling water system normal display step S232;
A second cooling water system determination step (S240) for determining whether the first average temperature value (T4) is smaller than the second average temperature value (T5) within the tolerance range after the first cooling water system determination step (S230);
After the second cooling water system determination step S240, if the first average temperature value T4 is less than the second average temperature value T5 within the tolerance range, it is determined whether the water pump 20 is operating normally Water pump function normal determination step S250;
A radiator abnormality display step (S252) of diagnosing and indicating that the radiator (50) is abnormal if the water pump (20) does not function normally in the water pump function normal determination step (S250); And
A cooling fan abnormality display step (S254) for diagnosing and displaying that the cooling fan (52) is abnormal if the water pump (20) normally functions in the normal water pump function determination step (S250);
And a method for diagnosing an abnormality in a water cooling system for a hybrid construction machine.

11. The method of claim 10,
In the cooling water temperature monitoring step S210,
Wherein the cycle for monitoring the cooling water temperature value is 0.5 s to 1.5 s, and the number of times of monitoring the cooling water temperature value is 2 to 4 times.

11. The method of claim 10,
After the second cooling water system determination step S240,
A third cooling water system determination step (S260) for determining whether the first average temperature value (T4) and the second average temperature value (T5) are equal within an allowable error range;
If the first average temperature value T4 and the second average temperature value T5 are equal to each other in the third cooling water system determination step S260, the radiator and the cooling fan abnormality diagnosis for diagnosing the abnormality of the radiator 50 and the cooling fan 52 Step S262; And
If the first average temperature value T4 and the second average temperature value T5 are different from each other in the third cooling water system determination step S260, a water cooling system total water check display step S264;
Further comprising the steps of: (a)

11. The method of claim 10,
Before the cooling water temperature monitoring step (S210)
A waiting step (S110) for waiting for a set waiting time after starting the hybrid construction machine;
Further comprising the steps of: (a)

15. The method of claim 14,
Wherein the set waiting time is 5 minutes to 10 minutes. &Lt; RTI ID = 0.0 > 18. < / RTI >