KR20040047071A - Cooling water circulating system trouble sensing device - Google Patents

Abstract

PURPOSE: A device for sensing the trouble of a coolant circulation system is provided to make a driver quickly cope with defects of the coolant circulation system and prevent the overheat of an engine caused by lack of the coolant by monitoring the circulation of the coolant and informing and warning broken parts of the coolant circulation system to the driver by collecting information detected from each sensor. CONSTITUTION: A device for sensing the trouble of a coolant circulation system comprises a coolant circulation detecting unit(1) installed in a coolant pipe passing coolant to detect the normal circulation of the coolant; a crank angle sensor(2) for detecting the rotation of a crankshaft; an alternator sensor(4) for sensing normal operations of an alternator; a coolant temperature sensor(3) for sensing the temperature of the coolant; and a control unit(5) for deciding abnormal parts of the coolant circulation system with information detected by each sensor.

Description

Cooling water circulating system trouble sensing device

The present invention relates to a cooling water circulation system failure diagnosis apparatus, and in particular, the driver can quickly check whether the cooling water circulation system is abnormal and cope with it, and diagnose the failure of the cooling water circulation system to prevent the engine overheat which is likely to occur due to the lack of cooling water. Relates to a device.

The engine generates power by burning fuel, and the cooling water is forced to circulate inside the engine in order to prevent overheating of the engine because the surrounding of the combustion chamber of the engine rises to a high temperature during the combustion operation.

When the coolant is not circulated normally in the engine, each friction part of the engine is excessively risen in temperature, thereby being stuck or broken, resulting in overheating due to engine overheating.

Therefore, the coolant circulation to the engine plays a very important role in the normal operation of the engine.

However, in the related art, since a device for accurately diagnosing a failure of the cooling water circulation system is not provided, even if the temperature of the cooling water rises rapidly or the flow of the cooling water stops, the reason for the failure and the location of the cooling water cannot be accurately and quickly diagnosed. When the engine is overheated or the engine is stopped due to the circulation system failure, the driver can not know the cause easily and is confused.In the vehicle, when the coolant is not supplied enough, the life of each friction part and engine This shortening problem was occurring.

Accordingly, the present invention for solving the above problems is to monitor the flow of the coolant using the coolant flow detection unit, crank angle sensor, coolant temperature sensor, alternator sensor, etc., if the circulation of the coolant (flow) is not made It collects the information detected from the sensor and judges the failure part of the coolant circulation system and alerts the driver so that the driver can quickly check and cope with the abnormality of the coolant circulation system, and the engine overheat which is likely to occur due to lack of coolant It is an object of the present invention to provide a cooling water circulation system failure diagnosis device that can be prevented.

1 is a block diagram showing an apparatus for diagnosing a failure of a cooling water circulation system of the present invention.

Figure 2 is a cross-sectional view showing a first embodiment of the coolant flow detection unit applied to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a cross-sectional view showing a second embodiment of the coolant flow detection unit applied to the present invention.

5 is a view showing a control map for determining a failure point of the cooling water circulation system in the present invention.

6 and 7 are diagrams showing an example of displaying a failure site through the display unit.

※ Explanation of code for main part of drawing

1 coolant flow detection unit 2 crank angle sensor

3: cooling water temperature sensor 4: alternator sensor

5: control unit 6: timer

7: display lamp 8: display unit

9: warning sound output unit 10: speaker

11: cooling pipe 12, 13, 16: terminal

14 sensing plate 17 rotating plate

1 to 7 illustrate a cooling water circulation system fault diagnosis apparatus of the present invention for achieving the above object. Referring to this drawing, preferred embodiments of the present invention will be described below.

The present invention for achieving the above object,

A coolant flow detection unit (1) installed in the cooling pipe (11) through which the coolant passes and detecting whether the coolant flows normally;

A crank angle sensor 2 for detecting rotation of the crankshaft;

An alternator sensor 4 which detects whether the alternator is normally operated;

Cooling water temperature sensor (3) for sensing the temperature of the cooling water;

Control unit for determining an abnormal occurrence portion of the cooling water circulation system (water pump, bogie belt for driving the water pump and time belt, abnormality of cooling fan, lack of cooling water) as the information detected by each sensor (1-4) (5); Characterized in that configured.

The control unit 5 further includes a timer 6 that counts for a set time period according to the control of the control unit 5, and the control unit 5 has a failure diagnosis result as a result of a water pump failure or a failure of the accessory belt driving the water pump. If it is determined that it is determined to drive the timer (6), when the timer 6 is counted for a predetermined time, characterized in that for outputting the control signal for the fuel other end to the ECU.

Further comprising a plurality of display lamps (7) for displaying the failure occurs in accordance with the control of the control unit 5, and under the control of the control unit 5, the fuel cut taken after the name of the failure site and the detection of the failure Display the remaining time until the operation screen, etc., and includes a display unit 8 is installed on the instrument panel that the driver can easily see,

Alarm sound information for storing the alarm sound information to provide to the driver when a failure of the cooling water circulation system is detected, and outputs a sound for notifying the failure portion through the speaker 10 under the control of the control unit 5 when detecting the failure site (9). It is configured to include.

The display unit 8 is preferably made of a small size, such as an LCD display panel to use an image display device capable of outputting images or text.

On the other hand, the coolant flow detection unit 1,

The first terminal 12 and the second terminal 13 for outputting a predetermined electric signal to the control unit 5 when the inner lower end of the cooling water pipe 11 through which the coolant passes, are provided at regular intervals, and the coolant is The sensing plate 14 which is in contact with the first and second terminals 12 and 13 and conducts in a vertical direction is installed from the upper side of the cooling pipe 11 according to the flow of the gas.

The coolant flow detection unit 1 configured as described above has the terminals 12 and 13 being pushed by the sensing plate 14 as shown by the dotted line in FIG. 2 when the coolant flows normally through the coolant pipe 11. Since no signal is transmitted from the second terminal 13 to the control unit 5, and the flow of the cooling water does not occur due to a failure of the cooling water circulation system, the sensing plate 14 is connected to the first and the second. As the terminals 12 and 13 come into contact with each other, the terminals 12 and 13 are turned on so that a predetermined electric signal is output to the controller 5.

That is, the controller 5 determines that the flow of the coolant does not occur when an electric signal is input from the second terminal 13, and determines that the coolant is normally circulated when the electric signal is not input.

As another embodiment of the present invention,

The coolant flow detection unit 1,

A third terminal for installing the housing 15 on the outer periphery of the cooling pipe 11 and outputting a predetermined electric signal to the control unit 5 when the sensing rotary plate 17 contacts one end of the housing 15; 16 is fixedly formed, and one end of the housing 15 protrudes into the cooling pipe 11 to be rotated by the flow of the cooling water to install the rotating plate 17 which is separated from the third terminal 16. And a spring 18 for applying elasticity in a direction in contact with the third terminal 16 of the rotating plate 17 on the upper side of the rotating plate 17.

When the coolant flow detection unit 1 is also configured to circulate the cooling plate 11 when the coolant is normally circulated by the flow of the coolant, the rotating plate 17 rotates and is separated from the third terminal 16, whereby the third terminal. The electrical signal output from the 16 to the control unit 5 does not occur, and when the flow of the cooling water does not occur, the rotating plate 17 is contacted with the third terminal 16 by the elasticity of the spring 18 and thus the third terminal. Predetermined electrical signals are supplied from the 16 to the controller 5.

Referring to the operation of the present invention configured as described above is as follows.

When the engine is running, the coolant flow detector (1), crank angle sensor (2), alternator sensor (4), coolant temperature sensor (3), etc., the flow of coolant, whether the engine rotates, whether the alternator is normal, and the coolant temperature Etc. is transmitted to the control unit 5, the control unit 5 collects the information provided from the respective sensors to accurately diagnose the abnormality of the cooling water circulation system and the failure site, and to alert the driver, The determination operation of the controller 5 is performed by the control map as shown in FIG.

Herein, the operation of each component will be described by dividing the fault parts of the circulatory system diagnosed by the controller 5 as follows.

◆ Malfunction of the water pump ◆

Water pump failures include impeller corrosion caused by antifreeze and failures due to improper rotation of the water pump pulley.

Since the water pump is a rotating body, the bearing is mounted, and sometimes the water pump pulley does not rotate due to the seizure of the bearing.

In case of failure of water pump pulley or impeller corrosion, there is no flow of cooling water, and the alternator and engine rotate normally.

Therefore, when the information transmitted from the coolant flow detection unit 1, the crank angle sensor 2, the alternator sensor 4, and the like is as described above, the controller 5 determines that the water pump pulley is a failure and alerts the driver. do.

The alarming method lights up the display lamp 7 corresponding to the water pump and drives the warning sound output unit 9 so that the water pump is broken and no circulation of the coolant occurs. The warning sound such as to be output through the speaker 10.

In addition, the control unit 5 drives the timer 6 to count the set time (about 60 seconds), and through the display unit 8 as shown in FIG. It is possible to quickly identify the faulty part.

When the counting of the timer 6 is completed, the controller 5 transmits a fuel cutoff signal to the ECU so that the engine is stopped by the fuel cutoff.

At this time, the driver checks the water pump failure state in the coolant circulation system, checks the remaining time until the engine stops, moves the vehicle to the safe area, and stops safely, thus preventing the driver from overheating the engine. Will be able to prevent in advance.

◆ Breakdown of bogie belt driving water pump ◆

Most engine coolant circulators are driven by timing belts, but in some engines, as the timing belts are replaced by chains due to durability issues, the number of vehicles carrying cooling water circulation as accessory belts is increasing.

If an abnormality occurs in the accessory belt, the alternator does not operate. When such a phenomenon is detected, the engine is shut off after a certain time.

That is, if the information detected by each sensor does not have a coolant flow, the alternator is stopped, and the engine is rotating normally, the controller 5 determines that the water pump has stopped due to an abnormality of the accessory belt. The alarm message, that is, the indicator lamp 7 is turned on and the alarm sound output unit 9 is driven, the voice message "The water pump is not operating due to an abnormality of the view belt". It is to be output through, and also through the display unit 8 to display the remaining time until the fuel cut off according to the counting operation of the timer (6) and the failure site.

FIG. 7 shows a state in which the fault site name output through the display unit 8 and the remaining time until the fuel cutoff are displayed.

◆ Failure of the time belt driving the water pump.

If the time belt driving the water pump fails, the engine will not be able to start itself, so the information detected by each sensor will not have a coolant flow, and the alternator will operate but the engine's rotation will not be detected.

The controller 5 determines that the water pump does not operate due to a failure of the time belt when the above information is input from each sensor, and the display lamp 7, the display 8, and the alarm sound output 9 Alert the driver through the back.

◆ ◆ cooling fan stopped

When the cooling fan of the engine stops, the circulation of the coolant is normally performed, but the temperature of the coolant increases rapidly.

That is, when the flow of the coolant occurs and the temperature detected by the coolant temperature sensor 3 exceeds about 100 ° C. in the state in which the alternator and the engine are normally driven, the controller 5 determines that the cooling fan is broken and correspondingly At the same time the display lamp 7 is turned on and the warning sound output unit 9 is driven so that a warning message such as 'The cooling fan is broken and the temperature of the coolant is rapidly rising' is output through the speaker 10. In addition, the display unit 8 displays the failure state of the cooling fan so that the driver can quickly check.

The driver who checks the failure of the cooling fan can check the fuse or fan motor and solve the cause of the failure.

If the detection temperature of the cooling water temperature sensor 3 exceeds 110 ° C. in the state of checking the failure of the cooling fan, the controller 5 outputs a fuel cutoff signal to the ECU to forcibly stop the engine.

◆ ◆ lack of coolant

When the amount of coolant is insufficient in the coolant circulation system, even if all components are normally driven, the sensing plate 14 or the rotating plate 17 constituting the coolant flow detection unit 1 due to a lack of water passing through the cooling pipe 11. Will not work.

Accordingly, the information detected from each sensor has no flow of coolant, normal operation of the alternator and the engine, and the coolant temperature exceeds about 100 ° C.

When the above condition is reached, the control unit 5 alerts the driver of the lack of coolant so that the driver can replenish the coolant.

As described above, the present invention monitors the flow of the coolant using a coolant flow detector, a crank angle sensor, a coolant temperature sensor, an alternator sensor, and the like, and detects each sensor when the coolant is not circulated (flow). By gathering the information to determine the failure part of the coolant circulation system and alerting the driver, the driver can quickly check and cope with the abnormality of the coolant circulation system and prevent the engine overheat which is likely to occur due to the lack of coolant. The effect of providing a cooling water circulation system failure diagnosis device can be expected.

Claims (7)

A coolant flow detection unit (1) installed in the cooling pipe (11) through which the coolant passes and detecting whether the coolant flows normally; A crank angle sensor 2 for detecting rotation of the crankshaft; An alternator sensor 4 which detects whether the alternator is normally operated; Cooling water temperature sensor (3) for sensing the temperature of the cooling water; Control unit for determining an abnormal occurrence portion of the cooling water circulation system (water pump, bogie belt for driving the water pump and time belt, abnormality of cooling fan, lack of cooling water) as the information detected by each sensor (1-4) (5); Cooling water circulation system failure diagnosis device, characterized in that consisting of. The method of claim 1, It further comprises a timer (6) for counting for a set time under the control of the control unit (5), the control unit (5) is a failure diagnosis as a result of the water pump failure, the watch belt for driving the water pump If determined, the timer 6 is driven, and when the timer 6 is counted for a predetermined time, the cooling water circulation system failure diagnosis device, characterized in that for outputting a control signal for the other fuel to the ECU. The method of claim 1, Cooling water circulation system failure diagnosis device characterized in that it further comprises a plurality of display lamps (7) for displaying the failure occurrence portion under the control of the control unit (5). The method of claim 1, Under the control of the control unit 5, the name of the fault site and the remaining time until the fuel cut operation taken after the detection of the fault, etc. are displayed on the screen, and the display unit 8 is installed on the instrument panel that the driver can easily see. Cooling water circulation system failure diagnosis device characterized in that the configuration. The method of claim 1, Alarm sound information for storing the alarm sound information to provide to the driver when a failure of the cooling water circulation system is detected, and outputs a sound for notifying the failure portion through the speaker 10 under the control of the control unit 5 when detecting the failure site (9). Cooling water circulation system failure diagnostic device, characterized in that configured to include. The method of claim 1, The coolant flow detection unit 1, The first terminal 12 and the second terminal 13 for outputting a predetermined electric signal to the control unit 5 when the inner lower end of the cooling water pipe 11 through which the coolant passes, are provided at regular intervals, and the coolant is Cooling water circulation system, characterized in that the detection plate 14 is installed in the vertical direction from the upper side of the cooling pipe 11 in contact with the first and second terminals (12, 13) and conducts depending on the flow of Diagnostic device. The method of claim 1, The coolant flow detection unit 1, A third terminal for installing the housing 15 on the outer periphery of the cooling pipe 11 and outputting a predetermined electric signal to the control unit 5 when the sensing rotary plate 17 contacts one end of the housing 15; 16 is fixedly formed, and one end of the housing 15 protrudes into the cooling pipe 11 to be rotated by the flow of the cooling water to install the rotating plate 17 which is separated from the third terminal 16. And a spring (18) for applying elasticity in a direction in contact with the third terminal (16) of the rotating plate (17) above the rotating plate (17).