KR20200027156A - Method for controlling engine cooing water temperature of vehicle - Google Patents

Abstract

The present invention relates to a method for controlling the cooling water temperature of a vehicle. The purpose of the present invention is to provide an improved method for controlling the cooling water temperature, which can adjust or lower the cooling water temperature to a desired target temperature more quickly and smoothly by using a cooling fan together while adjusting the cooling water temperature by using an integrated flow rate control valve. To this end, the method for controlling the cooling water temperature of a vehicle disclosed, comprises the steps of: determining whether the operating conditions of a logic for interlocking the integrated flow rate control valve and the cooling fan are satisfied from information including an operating state of the integrated flow rate control valve in a vehicle cooling system having the integrated flow rate control valve; determining a control value for controlling the operation of the cooling fan based on the current vehicle speed, the operating state of the integrated flow rate control valve, the cooling water temperature, and the target water temperature when it is determined that the operating conditions of the logic are satisfied; and controlling or maintaining the cooling water temperature by controlling the operation of the cooling fan according to the determined control value.

Description

Method for controlling engine cooing water temperature of vehicle

The present invention relates to a method for controlling the engine cooling water temperature of a vehicle, and more particularly, to an improved cooling water temperature control method capable of quickly or smoothly lowering or adjusting the temperature of the engine cooling water to an appropriate temperature according to the driving condition of the vehicle.

In general, in a vehicle equipped with an engine, the heat of combustion gas generated as the engine is driven is transferred to the cylinder head, piston, valve, and other engine parts. This may cause engine power to deteriorate.

Therefore, in the engine, a water jacket is installed on a cylinder block and a head, and the cooling water is circulated through the water jacket so that the engine is cooled.

Cooling water in the vehicle absorbs heat energy while circulating the engine, heater core, and radiator, or discharges it to the outside. Cooling water absorbing heat from engine parts is also difficult to perform cooling when the temperature is too high, and thus radiates heat from the radiator. .

The radiator is usually installed at the front of the vehicle to allow cold air flowing through the radiator grill to pass through, and while the cold air passes through the radiator, the coolant in the radiator is cooled by heat exchange with air.

In addition, a cooling fan is installed around the radiator of the vehicle to prevent stagnation of hot air, and the cooling fan is controlled according to variables such as cooling water temperature and vehicle speed.

For example, the cooling water temperature can be maintained at a certain level by operating the cooling fan when the cooling water temperature rises above a preset temperature by monitoring the cooling water temperature through the water temperature sensor during the operation and stop of the vehicle.

Further, as an example, in the case of a PWM duty type electric cooling fan, during operation and control, the controller transmits a control signal to a PWM (Pulse-Width Modulation) pulse width modulation control module, and the pulse width modulation control module is received. A PWM signal is generated based on the control signal to operate and control the cooling fan by driving the motor of the cooling fan.

At this time, the controller determines the duty and transmits the determined duty information to the pulse width modulation control module as a duty signal having a predetermined frequency, and the pulse width modulation control module converts the received duty signal into a pulse width modulation signal and outputs it. In addition, the cooling fan may be driven by controlling the voltage applied to the motor by the motor driving transistor according to the converted pulse width modulation signal.

On the other hand, recently, an integrated flow control valve (Integrated Thermal Management, ITM) is also applied to a cooling system of a vehicle for cooling engines, etc. FIG. 1 is a schematic diagram illustrating the configuration of a vehicle cooling system to which an integrated flow control valve is applied. .

In FIG. 1, reference numeral 15 denotes a cooling water line of the entire system providing a cooling water path in the cooling system.

More specifically, parts such as engine 1, radiator 11, oil cooler 13, heater core 14, water pump 16, thermostat 17, integrated flow control valve 20, etc. That is, the cooling water lines are connected to the circulating components to indicate all the cooling water lines through which the cooling water flows.

As illustrated, the cooling system of the vehicle includes a radiator 11 that discharges heat from the cooling water to the outside, a cooling fan 12 that is installed around the radiator 11 and sucks and blows air to pass through the radiator, and transmission oil Heat exchangers, such as an oil cooler 13 for temperature management, heater cores 14 for heating the interior of a vehicle, and radiators 11, oil coolers 13, heater cores 14, etc. It includes a cooling water line (15) connecting therebetween, and a water pump (16) for circulating cooling water along the cooling water line (15).

In addition, the cooling system of the vehicle is for controlling the cooling water flow state, and is installed in the cooling water line 15 between the radiator 11 and the engine 1 to control the cooling water flow state to the radiator 11 side. It further includes a stat (16).

In addition, the cooling system of the vehicle is installed in the cooling water line 15 between the engine 1, the radiator 11, the oil cooler 13, and the heater core 14, and the cooling water for the radiator, oil cooler, heater core, etc. It may further include an integrated flow control valve 20 for controlling the flow rate, distribution, and flow state.

In addition, the vehicle cooling system includes an integrated flow control valve 20, a coolant line 15, an engine 1, and a single or a plurality of water temperature sensors 24, 25, which are provided to detect the coolant temperature at a set position. 26) may be further included.

Among these configurations, the integrated flow control valve 20 has a flow path to a port connected to each part such as a cylinder block 2 of the engine 1, a radiator 11, and a heater core 14 through a coolant line 15. A plurality of valves (21, 22, 23) to open or close the opening or control the opening of the flow path is built.

Regarding the cooling system provided with the integrated flow control valve or the integrated flow control valve as described above, registration patent No. 10-1592428 (2016.2.1.), Registration patent No. 10-1558394 (2015.10.7.), Registration patent No. 10-1720568 (2017.3.22.), Published patent 10-2018-0036062 (2018.4.9.), And the like.

On the other hand, in the existing cooling system having only a mechanical thermostat, it is possible to maintain and manage the coolant temperature below a certain level so as not to be in an overheated state, but it is impossible to lower the coolant temperature to a desired temperature if necessary.

However, in a cooling system with an integrated flow control valve, it is possible to lower the cooling water temperature by controlling the opening degree of at least a part of a plurality of built-in valves, for example, a radiator side valve.

However, even in the cooling system with the integrated flow control valve 20, the cooling fan 12 is only when the cooling water temperature monitored by the water temperature sensor 24 is higher than a preset temperature during vehicle operation or stoppage as described above. Works.

As described above, according to the conventional control logic, the cooling fan 12 operates only when the cooling water temperature rises higher than the preset temperature, whereas when the cooling water temperature is lowered in the integrated flow control valve 20, the cooling fan 12 Since this does not work, there are cases in which cooling performance is insufficient in situations such as rapid acceleration oscillation and back driving.

Therefore, the cooling fan 12 can be effectively used while the cooling water temperature is lowered by using the integrated flow control valve to supply the coolant required for the engine 1 in the cooling system of the vehicle to which the integrated flow control valve 20 is applied. There is a need for a method, and a method for rapidly or smoothly lowering or adjusting the cooling water temperature to the target water temperature using the cooling fan 12 is required.

Accordingly, the present invention was created to solve the above problems, while using the cooling fan together while controlling the temperature of the coolant using the integrated flow control valve, the coolant temperature to the desired target water temperature more quickly and smoothly The aim is to provide an improved method of cooling water temperature control that can be lowered or adjusted.

In order to achieve the above object, according to an embodiment of the present invention, for the interlocking of the integrated flow control valve and the cooling fan from information including the operating state of the integrated flow control valve in a vehicle cooling system having an integrated flow control valve Determining whether the operating conditions of the logic are satisfied; Determining a control value for controlling the operation of the cooling fan based on the current vehicle speed, the operation state of the integrated flow control valve, the coolant temperature, and the target water temperature when it is determined that the logic operation condition is satisfied; And controlling or maintaining the cooling water temperature by controlling the operation of the cooling fan according to the determined control value.

Thus, according to the method for controlling the coolant temperature of a vehicle according to the present invention, in a cooling system having an integrated flow control valve, the cooling fan, which was operated only when the coolant temperature is higher than the set temperature, is interlocked with the operation state of the integrated flow control valve. By controlling, the cooling water temperature can be reduced more quickly and smoothly, and the problem of insufficient cooling performance can be effectively solved.

In addition, by controlling the cooling fan to interlock with the vehicle speed and the coolant temperature, the target water temperature, and the operating state of the integrated flow control valve, there is an advantage that the cooling water temperature can be more efficiently controlled and managed while preventing unnecessary reduction in fuel efficiency.

In addition, the cooling fan is operated only when the integrated flow control valve is operated in the cooling mode past the warm-up mode and when the condition that satisfies the logic operating condition satisfies a condition that lasts for a predetermined time or more, thereby preventing unnecessary fuel consumption from being reduced. However, there is an advantage that the cooling water temperature can be more efficiently controlled and managed.

1 is a schematic diagram showing the configuration of a vehicle cooling system to which an integrated flow control valve is applied.
2 is a flow chart showing the control process of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Throughout the specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated.

The present invention relates to a method for controlling the coolant temperature of a vehicle having an engine cooling system to which an integrated flow control valve is applied.

In addition, the present invention is to provide a cooling water temperature control method that can quickly or smoothly lower or adjust the cooling water temperature to a desired target water temperature by using a cooling fan while adjusting the engine cooling water temperature using an integrated flow control valve. .

In particular, the present invention effectively and effectively controls the cooling water temperature while preventing unnecessary fuel consumption reduction by controlling the cooling fan based on various information collected from the vehicle, such as the current vehicle speed and the cooling water temperature, the target water temperature, and the operating state of the integrated flow control valve. Or to provide an improved way to maintain and manage.

First, to help understand the present invention, a description will be given of a conventional cooling fan control method.

In the conventional control method, the controller monitors the coolant temperature detected by the water temperature sensor, and when the monitored coolant temperature is higher than a preset temperature, the cooling fan is operated to manage the coolant temperature so that it no longer increases.

At this time, the normal cooling fan control method controls the operating speed (rotational speed) of the cooling fan according to a control value determined by using the current vehicle speed and the cooling water temperature (hereinafter abbreviated as 'cooling water temperature') as variables. The value may be a duty value (%) corresponding to the target speed.

Table 1 below is a table illustrating a control value determined according to the vehicle speed and the cooling water temperature in the conventional cooling fan control logic, that is, a duty value (%) corresponding to the target speed of the cooling fan.

In the example of Table 1, the cooling fan is operated when the cooling water temperature rises higher than the preset temperature of 102 ° C, and in addition to the cooling water temperature, a control value (duty value) corresponding to the current vehicle speed is determined and used. .

As shown in Table 1, a table in which control values are set for each cooling water temperature and vehicle speed may be setting information that is previously input and stored in the controller. From the current vehicle speed and cooling water temperature, which are real-time information, input and stored in the controller. It can be used to determine a control value (duty value) for controlling the operation of the cooling fan.

That is, the control value for controlling the cooling fan, that is, the duty value, is calculated from the setting information shown in Table 1 according to the current vehicle speed and the cooling water temperature detected by the sensor at the controller, and the operation of the cooling fan is performed according to the duty value. By controlling, the operating speed (rotation speed) of the cooling fan is made to follow the target speed corresponding to the duty value.

In the example of Table 1, among the cooling fan operating speed duty values (control values) set to values according to the vehicle speed and cooling water temperature, 10% is the duty value corresponding to the cooling fan stop speed and condition, and 90% is the cooling fan maximum It is the duty value corresponding to the operating speed.

Therefore, controlling the cooling fan at a duty value of 10% means maintaining the cooling fan in a stopped state, and controlling the cooling fan at a duty value of 90% means controlling the cooling fan at the maximum operating speed.

As described above, the cooling fan may be operated by setting the speed corresponding to the duty value determined within the range of 10 to 90% according to the vehicle speed and the cooling water temperature as the target speed, and at this time, the cooling fan to follow the target speed corresponding to the duty value. Can control the operating speed.

According to such a conventional control method, the cooling fan is not operated until the cooling water temperature exceeds the preset temperature of 102 ° C., and the cooling fan is operated only when the cooling water temperature rises higher than 102 ° C., thereby causing high temperature cooling water flowing into the radiator. To cool.

Conventionally, this cooling fan operation logic has been applied to a cooling system equipped with an integrated flow control valve, and even if the cooling system is equipped with an integrated flow control valve, if the cooling water temperature is equal to or lower than the preset temperature, the cooling water temperature is reduced to the target water temperature. In this case, the cooling water temperature is lowered only by controlling the opening degree of the radiator side valve without the operation of the cooling fan.

Therefore, in the past, when the target water temperature was lowered, the cooling water temperature could not be lowered smoothly even though the cooling water temperature had to be rapidly lowered to the target water temperature. have.

Accordingly, while controlling the cooling water temperature by lowering the cooling water temperature using an integrated flow control valve under low vehicle speed conditions such as inflow of running wind that is not smooth, improved control to control the cooling water temperature to the target water temperature more quickly and smoothly The method is disclosed.

FIG. 2 is a flow chart showing a control process according to the present invention, and refer to FIG. 1 for a configuration of a cooling system in the following description.

First, a target water temperature is determined according to an engine operating state, where the engine operating state may include an engine speed and an engine load.

The determination of the target water temperature for the coolant from the engine speed and the engine load is a known technique, and thus, additional description will be omitted.

Although the description of the process in which the target water temperature is determined is omitted in FIG. 2, the target water temperature determined according to the engine speed and the engine load when the vehicle suddenly accelerates or accelerates according to the driving operation of the driver or when driving on a back road. Is lowered.

In addition, when the vehicle is left in an idle driving state or a vehicle stopped state for a long time, the angle of the integrated flow control valve is changed to follow the target water temperature. At this time, the radiator side valve 21 is controlled to gradually open to a predetermined angle (eg, integrated) Change the angle of the flow control valve from 70 ° to 165 °).

In addition, in the present invention, whether the cooling fan is operated and the target speed (or duty value corresponding to the target speed) is determined from the vehicle speed and the cooling water temperature using the setting information shown in Table 1, and the operation of the cooling fan is controlled according to the determined value. In addition to the conventional control logic, the controller controls the flow rate of the cooling water temperature to follow the target water temperature by controlling the integrated flow control valve, and when the predetermined condition is satisfied, the controller integrates with the current vehicle speed using previously input and stored setting information. Control logic for determining a control value for controlling the cooling fan operation is additionally used from information such as the operating state of the flow control valve, the current cooling water temperature, and the target water temperature.

Hereinafter, a separate cooling fan control logic that independently controls the operation of the cooling fan by using the vehicle speed and the cooling water temperature as variables regardless of the operation of the integrated flow control valve, that is, the conventional cooling fan control logic will be referred to as a first logic. .

In addition, hereinafter, as the new control logic added in the present invention, the improved control logic that controls the operation of the cooling fan in conjunction with the operation state of the integrated flow control valve will be referred to as the second logic.

The present invention includes a control process according to the first logic (conventional logic) and a control process according to the second logic (additional logic), and the cooling fan 12 according to the control logic including the first logic and the second logic. ) To control the operation, so that the cooling water temperature can quickly and smoothly follow the target water temperature, thereby improving control responsiveness, temperature followability, and vehicle cooling performance.

In the case of the second logic in the present invention, since the control value for controlling the operation of the cooling fan 12 is determined based on the operation state information of the integrated flow control valve 20, the second logic is substantially integrated flow control valve It can be said to be logic for interlocking control between the 20 and the cooling fan 12.

When explaining the control process according to the present invention in more detail, first, a controller (not shown, eg, an engine controller) is an engine operating state information, that is, a target coolant temperature based on engine speed and engine load, that is, a target water temperature After determining the, from the current cooling water temperature and target water temperature detected by the water temperature sensor 24, and the operation status information of the integrated flow control valve, the determined logic operating condition for the interlocking control of the integrated flow control valve and the cooling fan is determined. It is determined whether it is satisfied (S11, S12, S13).

Here, the logic operating condition is a condition that is preset in the controller, in the present invention, the controller is a condition (S11) in which the temperature difference between the current cooling water temperature and the target water temperature exceeds a preset temperature difference (eg, 10 ° C), and the target water temperature All of the conditions (S12) below a predetermined reference temperature (eg, 80 ° C) and the conditions where the angle of the integrated flow control valve 20 is within a predetermined range (eg, 100 ° <valve angle <165 °) (S13) If satisfactory, it is determined that the above logic operating conditions are satisfied.

At this time, if it is determined that the logic operation condition is satisfied, in step S14, it is determined whether the condition that satisfies the logic operation condition lasts for a predetermined time or longer, and if the condition that satisfies the logic operation condition is longer than a predetermined time (eg , 3 seconds) If it is determined to last, it is checked in step S15 whether the integrated flow control valve 20 is in the cooling mode.

Here, if the integrated flow control valve 20 is in the cooling mode, the maximum value of the control value determined according to the first logic and the control value determined according to the second logic is a control value for controlling the operation of the cooling fan 12 Final determination is made (S16), and the operation of the cooling fan 12 is controlled by the control value determined by the maximum value (S18).

On the other hand, if any one of the conditions of the steps S11, S12, and S13 is not satisfied, or the condition that satisfies the logic operation condition in step S14 does not last more than a predetermined time, and the integrated flow control valve in step S15 ( If 20) is not in the cooling mode, the controller controls the cooling fan 12 by a conventional cooling fan control method.

That is, the operation of the cooling fan 12 is controlled according to the control value (ie, the fourth control value) determined according to the first logic (S17, S18).

In the present invention, the angle of the integrated flow control valve 20 indicates the operating state of the integrated flow control valve, and in the logic operating condition, the angle of the integrated flow control valve 20 may be the angle of the cam.

As described above, in the present invention, when the integrated flow control valve 20 operates in a cooling mode, and the cooling fan 12 is operated only when the above-described logic operating conditions are satisfied for a predetermined time or more, unnecessary fuel consumption decreases. Do not.

As is known, in the conventional integrated flow control valve, when the angle of the cam is controlled, the angle of the plurality of valves in the integrated flow control valve according to the angle and position of the cam, such as a radiator side valve and a heater interlocked with the operation of the cam The angle (opening amount or lift) of the side valve and the valve on the engine cylinder block side is controlled to a desired amount.

In the following description, the angle of the integrated flow control valve may mean the angle of the cam.

In addition, in the present invention, the control value for controlling the operation of the cooling fan 12 may be a duty value described with reference to Table 1 above, that is, a duty value corresponding to the target speed, and the controller according to the final determined duty value. The operation of the cooling fan 12 is controlled so that the operation speed (rotation speed) of the cooling fan follows the target speed corresponding to the duty value (S18).

In the first logic, the control value, that is, the control value determined according to the current vehicle speed and the cooling water temperature, has no difference compared to the conventional control method described with reference to Table 1, and in the first logic, the cooling water temperature is a preset temperature. The control values according to the cooling water temperature and the vehicle speed are set so that the operating speed of the cooling fan 12 can be controlled with a control value (duty value corresponding to the target speed) determined from the cooling water temperature and the vehicle speed only in a higher condition.

In the following description, the control value determined by the controller using the setting information according to the first logic is referred to as a fourth control value, and the setting information as shown in Table 1 used to determine the fourth control value according to the first logic. Will be referred to as the fourth setting information.

In addition, the control value of the second logic is the first control value determined from the current vehicle speed and the angle of the current integrated flow control valve 20, and the second control determined from the current difference between the current cooling water temperature and the target water temperature and the current temperature And a third control value determined as a value according to a temperature difference between the current cooling water temperature and the target water temperature and the target water temperature.

In the present invention, the first control value, the second control value, and the third control value may be determined using preset information input and stored in the controller, respectively.

The angle of the integrated flow control valve, the vehicle speed, the cooling water temperature, the first control value and the second control value according to the target water temperature, the third control value is the result of the control, whether the cooling fan is running, the cooling fan operation time, and It determines the operating speed of the cooling fan.

Tables 1 to 4 below show examples of setting information that can be used to determine the first control value, the second control value, and the third control value according to the second logic in the controller. Is showing.

In the following description, the setting information used to determine the first control value in the controller is referred to as the first setting information, and the setting information used to determine the second control value is used to determine the second setting information and the third control value. The setting information to be referred to as the third setting information.

Table 2 shows the first setting information, Table 3 shows the second setting information, and Table 4 shows the third setting information, and it is revealed that all of the actual control values are omitted from the entire range.

As can be seen from Table 2, the first setting information used to determine the first control value in the controller is a table in which the first control value is set as a value according to the angle and vehicle speed of the integrated flow control valve 20. You can.

In addition, the setting information used to determine the second control value from the controller may be a table in which the second control value is set to a value according to a temperature difference and a vehicle speed between the cooling water temperature and the target water temperature.

Here, the angle of the integrated flow control valve 20 may mean an angle of the cam in the integrated flow control valve, that is, a cam interlocking a plurality of valves.

In addition, the setting information used to determine the third control value by the controller may be a table in which the third control value is set as a value according to the temperature difference between the cooling water temperature and the target water temperature and the target water temperature.

In each setting information, the control value may be a duty value corresponding to the target speed of the cooling fan 12, and the larger the control value (duty value), the greater the target speed.

In a preferred embodiment, the vehicle speed V of the first setting information and the second setting information may be divided into a plurality of regions in a predetermined range, and control values may be set for each divided region.

In Table 2, '0', '1', '2', and '3' indicate vehicle speed indication values corresponding to each region.

For example, '0' represents a vehicle speed region less than a [km / hr], '1' represents a vehicle speed region of a [km / hr] ≤ V <b [km / hr], and '2' represents b The vehicle speed region of [km / hr] ≤ V <c [km / hr], and '3' represents a vehicle speed region of c [km / hr] or higher (a <b <c).

Likewise, the angle of the integrated flow control valve in the first setting information, the temperature difference between the cooling water temperature and the target water temperature in the second setting information and the third setting information, and the target water temperature in the third setting information are also divided into a plurality of regions within a predetermined range. The control value may be set for each divided area.

In addition, in the first setting information, the control value may be set so that the target speed of the cooling fan 12 becomes a larger value when the angle is greater when the vehicle speed is the same within a predetermined angle range of the integrated flow control valve 20. In addition, when the angle of the integrated flow control valve is the same within the predetermined angular range, the control value may be set such that the smaller the vehicle speed, the larger the target speed.

In addition, a control value for operating the cooling fan 12 only when the angle of the integrated flow control valve is within the predetermined angle range, that is, a control value of a target speed greater than '0' may be set in the first setting information.

In addition, the control value of the target speed '0', that is, a control value corresponding to a stop state in which the cooling fan 12 is not rotated may be set in the first setting information regardless of the vehicle speed when outside the predetermined angle range. .

And, in the second setting information, a control value may be set such that the target speed of the cooling fan 12 becomes a larger value as the temperature difference between the cooling water temperature and the target water temperature becomes greater when the vehicle speed is the same condition, and the temperature difference is the same condition. When the vehicle speed is smaller, the control value may be set so that the target speed of the cooling fan 12 becomes a larger value.

Also, in the third setting information, a control value for operating the cooling fan 12 only when the target water temperature is equal to or less than a preset water temperature value, that is, a control value of a target speed greater than '0' may be set.

Also, in the third setting information, a control value for operating the cooling fan 12 only when the temperature difference between the cooling water temperature and the target water temperature exceeds a preset temperature difference, that is, a control value of a target speed greater than '0' may be set. .

At this time, the control value for operating the cooling fan 12, that is, the control value under the condition that the target water temperature is equal to or less than the preset water temperature value, and the control value under the condition that the temperature difference exceeds the preset temperature difference is the target water temperature and the temperature difference. They can all be set to the same value regardless of changes.

In addition, the temperature difference between the cooling water temperature and the target water temperature in the second setting information and the third setting information is a value obtained by subtracting the target water temperature (determined from the engine operating state such as engine rotation speed and engine load) from the current cooling water temperature (which is a sensor detection value). .

As described above, the process of determining the first control value, the second control value, and the third control value, which are control values determined according to the second logic, has been described in detail. In step S15, the integrated flow control valve 20 is cooled. When the controller determines that it is in the state of the mode, the controller cools the maximum value among the fourth control value determined in the first logic and the first control value, second control value, and third control value determined in the second logic. The final value is determined as a control value for controlling the operation of the.

Also, in step S14, it has been described that the controller satisfies all three conditions, which are logic operating conditions, to determine whether or not it lasts for a predetermined time or longer (eg, 3 seconds). Instead of determining whether it lasts longer than time, step S14 first determines the first control value, the second control value, the third control value, and the fourth control value, and then the maximum value of all four or four control values It may be a step of determining whether the preset time (eg, 3 seconds) or more is maintained.

That is, the condition in which the temperature difference between the current cooling water temperature and the target water temperature exceeds a preset temperature difference, and the target water temperature is less than a preset reference temperature, and a condition in which the angle of the integrated flow control valve is within a preset range. The logic may be configured to determine that the control value is maintained for a predetermined time or longer in step S14, instead of determining that the duration is longer than the predetermined time.

In this case, if the controller determines that the control value is maintained for a predetermined time or longer in step S14, step S15 to determine whether the angle of the integrated flow control valve 20 is in the position of the cooling mode is performed in the same way.

If, in step S14, the control value is not maintained for a predetermined time or longer, the controller controls the operating speed (rotation speed) of the cooling fan 12 with the fourth control value (S17, S18).

In addition, in the present invention, the cooling mode is the same mode as the cooling mode, which is one of the operating modes of the known integrated flow control valve.

The well-known integrated flow control valve is controlled to operate in one of a plurality of operating modes after the engine starts of the vehicle, and the operation modes of the well-known integrated flow control valve are warm-up mode and cooling mode. mode) and a heating mode.

In addition, the angle of the integrated flow control valve 20 is controlled at an angle determined for each operation mode. In the present invention, the integrated flow control valve 20 passes through the warm-up mode after the engine starts and operates in a cooling mode in step S15. If it is determined that, that is, when determining that the angle of the integrated flow control valve 20 is located in the cooling mode, step S16 of determining the maximum value among the first to fourth control values as the final control value for cooling fan control Proceeds.

Among the operation modes of the integrated flow control valve 20, a warm-up mode is a mode in which the cooling water temperature is increased until the critical temperature is reached when the cooling water temperature is lower than a preset critical temperature after the engine starts.

In addition, the cooling mode is a mode in which the cooling water temperature is controlled and managed to follow the target water temperature determined from the engine operation state (engine rotation speed and engine load, etc.) under conditions where the cooling water temperature is equal to or higher than the critical temperature.

In addition, the heating mode is a mode in which heating is prioritized, and the heater core side valve of the integrated flow control valve is opened to the maximum under the condition that the outside air temperature is equal to or less than a preset air temperature value and the vehicle heating device (air conditioner) is on. As a mode, it is an operating mode selected during maximum heating or initial heating.

Since each operation mode of the integrated flow control valve including the warm-up mode, the cooling mode, and the heating mode is a well-known technology, further detailed description will be omitted.

In the present invention, the operation of the cooling fan 12 is controlled by the control value according to the second logic (maximum of the first to fourth control values) only in the cooling mode excluding the warm-up mode and the heating mode, and the warm-up mode and the heating mode In the operation, the operation of the cooling fan 12 is controlled by a control value (fourth control value) according to the first logic.

In addition, it was previously described that the control value is a control value related to the cooling fan operating speed, in particular, a duty value corresponding to the target speed of the cooling fan, and the duty value is to control the motor speed of the cooling fan in the PWM duty-controlled electric cooling fan. It can be a PWM duty value.

In addition, in the foregoing, when the control value is determined as described above, it has been described that the operating speed of the cooling fan is controlled at the target speed corresponding to the determined control value, but the target speed is the control value for controlling the operation of the cooling fan. Instead of the corresponding control value (duty value), the cooling fan operating time can be used.

Alternatively, in addition to a control value corresponding to the target speed as a control value for controlling the operation of the cooling fan, a cooling fan operating time may be further used.

That is, the cooling fan operating time (sec) is determined based on the average fuel consumption (ml / sec) which is a variable value that can represent the engine load in the controller and the current cooling water temperature (° C.), and the controller during the determined operating time It is to operate the cooling fan.

Since the engine controller checks the average fuel consumption during engine operation, the controller may be set to determine the cooling fan operating time using the setting information from the average fuel consumption and the cooling water temperature detected by the water temperature sensor 24.

Here, the setting information may be a table in which the operating time is set to a value according to the average fuel consumption and cooling water temperature, and is input and stored in advance in the controller and used to determine the cooling fan operating time from the average fuel consumption and cooling water temperature. Can be.

In addition, as shown in Tables 1 to 4, the cooling fan that can freely select and adjust the duty within a predetermined range is a PWM duty control type cooling fan, and in addition to the duty control type cooling fan, off, 1st, 2 However, since a relay type cooling fan that can control the operating speed and state of the cooling fan is used, the control value of the relay type cooling fan is a value indicating an off, 1st, 2nd, etc. do.

That is, the cooling fan in the front may be a PWM duty control type cooling fan, but a cooling fan that is not a PWM duty control type, that is, a duty-free relay type that cannot be controlled and can be operated only in off, 1st, and 2nd stages In the case of the cooling fan of the above, the same logic is applied, but the control values in the setting information as shown in Tables 1 to 4 are off related to the cooling fan operating speed and state instead of the duty value (%). , 1st and 2nd are replaced with values.

In this way, according to the cooling water temperature control method according to the present invention, in a cooling system having an integrated flow control valve, the cooling fan, which was operated only when the cooling water temperature is higher than the set temperature, is linked to the operating state of the integrated flow control valve. By controlling, the cooling water temperature can be reduced more quickly and smoothly, and the problem of insufficient cooling performance can be effectively solved.

In addition, by controlling the cooling fan to interlock with the vehicle speed and the coolant temperature, the target water temperature, the operating state of the integrated flow control valve, and the like, it is possible to more effectively control, maintain, and manage the coolant temperature while preventing unnecessary reduction in fuel efficiency.

The embodiments of the present invention have been described in detail above, but the scope of rights of the present invention is not limited thereto, and various modifications and improvements of a person skilled in the art using the basic concept of the present invention as defined in the following claims. Also included in the scope of the present invention.

1: Engine 2: Cylinder block
3: Cylinder head 11: Radiator
12: cooling fan 13: oil cooler
14: heater core 15: coolant line
16: water pump 17: thermostat
20: integrated flow control valve 21: radiator side valve
22: heater core side valve 23: block side valve
24, 25, 26: water temperature sensor

Claims (14)

Determining whether an operation condition of logic for interlocking the integrated flow control valve and the cooling fan is satisfied from information including an operating state of the integrated flow control valve in the vehicle cooling system having the integrated flow control valve;
Determining a control value for controlling the operation of the cooling fan based on the current vehicle speed, the operation state of the integrated flow control valve, the coolant temperature, and the target water temperature when it is determined that the logic operation condition is satisfied; And
And controlling or maintaining a cooling water temperature by controlling the operation of the cooling fan according to the determined control value.
The method according to claim 1,
In the step of determining whether the logic operation condition is satisfied, the information further includes a current coolant temperature and a target water temperature, and the operation state of the integrated flow control valve is an angle of a cam in the integrated flow control valve. Cooling water temperature control method.
The method according to claim 1 or claim 2,
The logic operating conditions
A first condition in which the temperature difference between the current cooling water temperature and the target water temperature exceeds a preset temperature difference;
A second condition in which the target water temperature is below a preset reference temperature; And
Method for controlling the coolant temperature of a vehicle, characterized in that it comprises a third condition in which the angle of the integrated flow control valve is within a preset range.
The method according to claim 3,
When all of the first condition, the second condition and the third condition are satisfied, it is determined that the logic operation condition is satisfied.
The method according to claim 1
Determining whether a state satisfying the logic operation condition lasts for a predetermined time or longer; And
When it is determined that the preset time is continued, the method further includes determining whether the operation mode of the integrated flow control valve is a cooling mode that controls and manages the coolant temperature to follow the target water temperature determined from the engine operation state,
When it is determined that the operation mode of the integrated flow control valve is a cooling mode, determining the control value, and controlling the operation of the cooling fan according to the determined control value, the cooling water temperature of the vehicle. Control method.
The method according to claim 5
When it is determined that the state satisfying the logic operating condition does not last longer than the preset time, or when it is determined that the operation mode of the integrated flow control valve is not a cooling mode, control determined according to the current vehicle speed and the coolant temperature And controlling the operation of the cooling fan according to the value.
The method according to claim 1
And when it is determined that the logic operation condition is not satisfied, controlling the operation of the cooling fan according to a control value determined according to the current vehicle speed and the cooling water temperature.
The method according to claim 1
Determining an operation mode of the integrated flow control valve; And
The operation mode of the integrated flow control valve is a warm-up mode in which the coolant temperature is raised until the critical temperature is reached when the coolant temperature after the engine starts is lower than a preset threshold temperature, or the heater core of the integrated flow control valve If it is determined that the heating mode is to open the side valve to the maximum, further comprising the step of controlling the operation of the cooling fan according to a control value determined according to the current vehicle speed and the coolant temperature.
The method according to any one of claims 1 and 6 to 8,
The control value is a control value for controlling the operating speed of the cooling fan,
In the step of controlling the operation of the cooling fan according to the determined control value, the cooling water temperature control method of the vehicle, characterized in that for controlling the operating speed of the cooling fan according to the control value.
The method according to claim 1,
Determining the control value is
A first control value determined using the first setting information from the current vehicle speed and the angle of the integrated flow control valve;
A second control value determined using the second setting information from the current difference between the current coolant temperature and the target water temperature and the current speed;
A third control value determined using the third setting information from the temperature difference between the current coolant temperature and the target water temperature and the target water temperature; And
A fourth control value determined using the fourth setting information is determined from the current vehicle speed and the coolant temperature,
A method for controlling the cooling water temperature of a vehicle, characterized in that the maximum value of the first to fourth control values is finally determined as a control value for controlling the operation of the cooling fan.
The method according to claim 10,
The control value is a control value corresponding to the target speed of the cooling fan,
The first setting information
When the vehicle speed is the same condition, the larger the angle of the integrated flow control valve is, the control value is set such that the target speed of the cooling fan is greater, and the smaller the vehicle speed when the angle of the integrated flow control valve is the same condition, the target Method for controlling the coolant temperature of a vehicle, characterized in that the control value is set so that the speed becomes a larger value.
The method according to claim 10 or 11,
In the first setting information, a control value for rotating a cooling fan is set only when the angle of the integrated flow control valve is within a predetermined angle range.
The method according to claim 10,
The control value is a control value corresponding to the target speed of the cooling fan,
In the second setting information, a control value is set so that the target speed of the cooling fan becomes a larger value when the temperature difference between the coolant temperature and the target water temperature is greater when the vehicle speed is the same condition, and when the temperature difference is the same condition, the cooling speed is smaller. Method for controlling the coolant temperature of a vehicle, characterized in that the control value is set so that the target speed of the fan becomes a larger value.
The method according to claim 10,
The third setting information is a method for controlling the cooling water temperature of a vehicle, wherein a control value for rotating the cooling fan is set only when the target water temperature is equal to or less than the preset water temperature value and the temperature difference between the coolant temperature and the target water temperature exceeds the preset temperature difference. .

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