JPH10299484A - Method and device for variably controlling speed of cooling fan motor by automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device to variably control the rotation speed of a cooling fan motor based on an operation state detected during running of an automobile. SOLUTION: An engine control part 300 is formed such that a region of a graph to be mapped by fan RPM corresponding to cooling water temperature is set to a number of control regions to calculate the fan RPM corresponding to a sensed cooling water temperature. The temperature of cooling water decides the control region in a case of a drive condition for a fan motor 400, and a control signal 310 corresponding to the decided control region is fed to a drive part. The air-conditioner of the automobile sets RPM of a cooling fan as a maximum value in a case of the drive condition of the fan motor 400 and a control signal corresponding to the set RPM is fed to a drive part. An engine control part controls the speed of the fan motor 400 to be optimum based on the change of the resistance value of a variable resistor 800 and a temperature of cooling water so that power and a load condition required for drive are minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor vehicle, and more particularly, to detecting the operating state of a vehicle during operation and changing the rotational speed of a cooling fan motor based on the detected operating state. To a method and apparatus for controlling

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing a circuit configuration of a conventional cooling fan motor control device for an automobile. As shown in FIG. 1, an operation sensor 10 detects an operation state of an air conditioner and provides an operation detection signal 11. The water temperature sensor 20 detects the temperature of the cooling water circulating through the radiator, the engine, and the cooling / heating system, and outputs a water temperature detection signal 21.
I will provide a. Reference numeral Vcc indicates a power supply from a battery. Reference numeral 40 denotes a fan motor for driving a cooling fan (not shown) for lowering the temperature of the cooling water. The engine controller 30 controls the power supply Vcc to be supplied to the fan motor 40 in accordance with the operation sensing signal 11 from the operation sensor 10 and the water temperature sensing signal 21 from the water temperature sensor 20.

[0003] A driver turns on a start key (not shown).
When the switching is performed to the ON state and the switching element 30A included in the engine control unit 30 is switched to the ON state, the current supplied from the power supply Vcc passes through the first fuse (F1) through the relay coil 50A of the relay 50. Flows. At this time, the relay switch 50B is short-circuited to connect the fan motor 40 to the power supply Vcc. During the operation of the fan motor 40, the cooling fan connected to the drive shaft of the fan motor 40 rotates to lower the temperature of the cooling water. At this time, the high voltage cutoff switch 60 cuts off the high voltage supplied from the battery to the fan motor 40.

While the engine of the vehicle is running, the engine control unit 30 receives the water temperature sensing signal 2 from the water temperature sensor 20.
Recognize the temperature of the cooling water according to 1. At this time, the engine control unit 30 compares the current temperature of the cooling water with a critical temperature (generally indicating 80 ° C.). If the current temperature of the cooling water is lower than the critical temperature, the engine control unit 30
0 to provide a 'high' level drive control signal to relay 5
0 keeps the 'off' state. Therefore, the power supply Vcc is not supplied to the fan motor 40 via the second fuse (F2), and the fan motor 40 remains stopped. That is, the engine control unit 30 does not need to drive the fan motor 40 because the cooling water already has a temperature suitable for cooling the engine of the automobile.

On the other hand, if the current temperature of the cooling water is higher than the critical temperature, the engine control unit 30 sends a low signal to the relay 50.
A level drive control signal is provided to maintain the relay 50 in the 'on' state. Therefore, the power supply Vcc is supplied to the fan motor 40 via the second fuse (F2), and the cooling fan motor 40 maintains the operating state. That is, since the cooling water has a high temperature that is not suitable for cooling the engine, the engine control unit 30 drives the fan motor 40 to lower the temperature of the cooling water.

The engine control unit 30 checks the operation state of the air conditioner according to the operation detection signal 11 from the operation sensor 10. When the air conditioner does not operate, the fan motor 40 is kept stopped as in the case where the current temperature of the cooling water is lower than the critical temperature. When it is determined that the air conditioner operates, the engine control unit 30 provides a drive control signal to the fan motor 40 as in the case where the current temperature of the cooling water is higher than the critical temperature. That is, the engine control unit 30 drives the fan motor 40 so as to prevent the temperature of the cooling water from rapidly rising due to the operation of the air conditioner. At this time, heat generated from the engine and the air conditioner is dissipated by the cooling fan.

For example, US Pat. No. 5,307,644 to James M. Cummins discloses an electronic engine fan control. The control device has means for detecting the engine coolant temperature, the operation of the vehicle air conditioning load, and the running speed of the vehicle. The control device also has means for generating first and second temperature signals depending on the temperature of the engine coolant. The control device further includes invalid signal generating means for generating the first and second invalid signals under a certain temperature or a certain load and speed condition. The control device generates a control signal for operating the vehicle fan.
There is further provided a means for comparing the first and second temperature signals with the first and second invalidation signals. A method for controlling an engine fan includes detecting an engine coolant temperature, an air conditioning load, and a running speed to generate a corresponding signal. The method further includes generating a control signal for operating the engine fan by comparing the temperature, load, and speed signals with preset values.

[0008]

However, in the above-mentioned conventional fan motor (ie, cooling fan) drive control device, the water temperature sensor 20 malfunctions or the water temperature sensing signal 21 that is accurately sensed is sent to the engine control unit 30. When the cooling water cannot be provided, the fan motor 40 does not operate even though the temperature of the cooling water rises, and the cooling water boils and overflows.

An object of the present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a water temperature sensor malfunction, an engine starting state, and an air conditioner operating state during operation of an automobile. And an apparatus for sensing an operation state including a temperature of the cooling water and variably controlling a rotation speed of the fan motor when the sensed temperature of the cooling water is a driving condition of the fan motor. is there.

Another object of the present invention is to provide an apparatus for driving the fan motor at a set maximum rotational speed when the air conditioner is operating.

Still another object of the present invention is to provide an apparatus for varying a resistance value of a variable resistor based on the sensed operation state and controlling a speed of a fan motor according to the varied resistance value. Is to provide.

It is still another object of the present invention to provide a cooling water temperature versus a cooling fan sensed temperature on a graph showing a target fan RPM when the sensed cooling water temperature is a driving condition of a fan motor. It is another object of the present invention to provide a control method for setting a control region for optimally controlling a fan RPM and variably controlling a speed of a fan motor based on the control region.

Still another object of the present invention is to set the temperature of the cooling water applied when driving or stopping the fan motor in accordance with the above-mentioned graph, so that the temperature of the cooling water can be adjusted according to the hysteresis characteristics. And a control method for driving the fan motor.

It is still another object of the present invention to provide a method for driving the fan motor at a set maximum speed while the air conditioner is operating.

[0015]

According to the present invention, there is provided a method for variably controlling the speed of a cooling fan motor in a motor vehicle according to the present invention, comprising the steps of: (A) malfunction of a water temperature sensor and operation of an engine; And (B) if it is determined in step (A) that the engine is not running,
The process of performing Norlance Spark Fan Logic;
(C) If it is determined in the step (A) that the engine is operating, the variable THE based on the FRPM indicating the RPM of the fan.
Set a value of 1 and change the THE1 to cooling water temperature vs. target fan RPM.
(D) comparing with the KDEGL which is a calibration parameter indicating the minimum cooling water temperature in the graph of (a), and (C) determining that the THE1 is equal to or higher than the KDEGL,
Executing a FRPM (COOLDEG) logic to determine a control region based on the input variable COOLDEG having the currently sensed temperature value of the cooling water in the graph and calculate a target fan RPM; (F) checking the fuel supply interruption state based on the comparison result of the THE1 and the KDEGL in the step (C), and determining whether the air conditioner operates based on the check result; If it is determined in step (E) that the fuel supply has been interrupted, a step of determining whether or not the air conditioner is operating; and (G) that the air conditioner is operating. If it is determined in step (E), the variable THE2 is determined based on the FRPM.
Setting the value of, and comparing the THE2 with FLACPRES which is an input variable indicating the head pressure of the air conditioner;
(H) If it is determined in the step (G) that the THE2 is equal to or less than the FLACPRES, the variable frpm is set to KFRPMH, a calibration parameter indicating the target maximum RPM in the graph.
And (I) determining the control area, KIS,
Performing fan-on logic to set the value of the variable having KIDI and KIDFN; and (J) determining the control area and setting the value of the variable having KIDFN.
Performing the fan-off logic.

To achieve the above object, an apparatus for variably controlling the speed of a cooling fan motor in a motor vehicle according to the present invention comprises applying a voltage to a fan motor for rotating a cooling fan to reduce the temperature of cooling water. The driving means for varying the magnitude of the driving voltage / current to be performed according to the control signal, and the cooling water temperature versus the target fan RPM to calculate a fan RPM corresponding to the sensed cooling water temperature. The area of the graph to be mapped is set as a number of control areas, and the control signal corresponding to the determined control area is determined by determining the control area when the temperature of the cooling water is the driving condition of the fan motor. Provided to the driving means, when the air conditioner of the vehicle is in the driving condition of the fan motor, the control signal corresponding to the set RPM by setting the RPM of the cooling fan to the maximum value. Consisting of an engine control means for providing a serial drive means.

In the method and apparatus for variably controlling the speed of a cooling fan motor in an automobile according to the present invention, the temperature of the cooling water is constantly sensed by a water temperature sensor, and the air conditioner is operated while the engine is running. Is running, the fan motor is driven immediately. on the other hand,
The temperature of the cooling water is irregularly sensed by the water temperature sensor,
If the engine is running, the fan motor is driven. Also, the engine control unit is required to drive the fan motor in order to optimally control the speed of the fan motor based on the control area determined according to the sensed temperature of the cooling water and the RPM of the cooling fan. Power and load conditions are minimized.

[0018]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a block diagram showing a circuit configuration of a cooling fan motor control device for an automobile according to one embodiment of the present invention. As shown in FIG.
The operation sensor 100 detects an operation state of the air conditioner and provides an operation detection signal 110. Water temperature sensor 2
00 senses the temperature of the cooling water circulating through the radiator, the engine and the cooling / heating system and provides a water temperature sensing signal 210. The pressure sensor 700 senses the head pressure of the air conditioner and provides a pressure sensing signal 710.

The fan RPM sensor 900 senses the rotation speed (ie, RPM) of the cooling fan rotated by the fan motor 400 and provides a speed detection signal 910.
The relay 500 includes a relay coil 500A and a relay switch 5 whose contacts are opened and closed by the relay coil 500A.
00B. Reference numeral Vcc indicates power from a battery. The variable resistor 800 has a variable resistance value,
Power supply Vc supplied via relay switch 500B
c, the voltage of the fan motor 4
Supply to 00. The high voltage cutoff switch 600 is connected to the power supply Vc
c, the high voltage applied to the fan motor 40 is cut off.

The engine control unit 300 has a switching element 300 A, and has an operation sensing signal 110 from the operation sensor 100 and a water temperature sensing signal 210 from the water temperature sensor 200.
Accordingly, the switching operation of the switching element 300A and the resistance value of the variable resistor 800 are controlled. The engine control unit 300 sends the control signal 310 to the variable resistor 80
0 is applied to adjust the resistance value of the variable resistor 800. When switching element 300A is switched to the ON state, current supplied from power supply Vcc via first fuse (F1) is applied to relay coil 5 of relay 500.
Flow through 00A. At this time, the relay switch 50
OB is short-circuited to connect the fan motor 400 and the motor Vcc.

When the power supply Vcc is supplied to the second fuse (F2),
In order to apply a current voltage to the fan motor 400 via the relay switch 500B and the variable resistor 800, the voltage set by the variable resistor 800, the resistance value of which is adjusted by the engine control unit 300, is controlled by the fan. Applied to the motor 400. During the operation of the fan motor 400, the cooling fan fixed to the drive shaft of the fan motor 400 rotates to lower the temperature of the cooling water.

FIG. 3 shows a graph of cooling water temperature versus target fan RPM which defines a control region for variably controlling the RPM of the fan when the temperature of the cooling water is a driving condition of the cooling fan. It is a drawing. As shown in FIG. 3, the horizontal axis represents the temperature of the cooling water detected by the water temperature sensor 200, and the temperature of the cooling water is indicated by COOLDEG, which is an input variable having the currently sensed temperature value of the cooling water. The vertical axis indicates the RPM of the cooling fan, and the RPM of the cooling fan is indicated by FRPM.

KDEGL on the horizontal axis is a calibration parameter indicating the temperature of the cooling water relative to the target minimum fan RPM. KFANLOTHY has a predetermined spacing in the negative direction from the KDEGL on the cooling water temperature axis of the graph, indicating cooling water temperature hysteresis for low speed fan disabled;
It is a calibration parameter. That is, KDEGL
Indicates the minimum cooling water temperature for operating the cooling fan, and KDEGL-KFANLOTHY indicates the cooling water temperature applied when the cooling fan is stopped. KDEG1 is the first cooling water
Is a calibration parameter indicating the temperature of KDEG2
Is a calibration parameter indicating the second temperature of the cooling water. KDEGH is a calibration parameter that indicates the maximum cooling water temperature for the target maximum fan RPM. Here, KDEGL <KDEG1 <KDEG2 <KDEGH.

On the vertical axis, KFRPML is a calibration parameter indicating the target minimum fan RPM. That is, KFRP
ML indicates the target fan RPM when the sensed temperature of the cooling water in the graph is below KDEGL. KFRPM1 is the primary purpose fan RPM when the sensed temperature of the cooling water is KDEG1.
Is a calibration parameter. The KFRPM2
Is the second when the sensed temperature of the cooling water is KDEG2
Is a calibration parameter indicating the desired fan RPM. The KFRPMH is a calibration parameter indicating a target maximum fan RPM when the sensed temperature of the cooling water is equal to or higher than KDEGH. Where KFRPML <KFRPM1 <KFRPM2 <KF
RPMH.

When the temperature of the cooling water is the driving condition of the cooling fan, the control area for variably controlling the speed of the cooling fan has first, second, third, and fourth control areas. The first control area includes coordinates (KDEGL, KFRPML) and (KDEG1, KF
FRPM1). The second control area includes the coordinates (KDEG1, KFRPM1) and (KDEG1, KFRPM1).
2, KFRPM2). The third control area includes coordinates (KDEG2, KFRPM2) and (K
DEGH, KFRPMH). The fourth control area has a coordinate value of (KDEGH, K
FRPMH) or more.

When the temperature of the cooling water sensed by the water temperature sensor 200 is equal to or higher than KDEGH, the RPM of the cooling fan is maintained at the target maximum fan RPM KFRPMH without being variably controlled by the engine controller 300. . Fan RPM is maintained at KFRPMH even when the air conditioner is running. When the temperature of the cooling water is equal to or lower than KDEGL, the RPM of the cooling fan is maintained at KFRPML which is the target minimum fan RPM without being variably controlled by the engine control unit 300. The slope of the graph belonging to the second control area is equal to the first
Or, it is larger than the slope of the graph belonging to the third area.

A control method performed by the control device shown in FIG. 2 according to the flowcharts of FIGS. 4 to 10 will be described below. 4 and 5 are flowcharts illustrating a method for variably controlling the RPM of the fan in the control region shown in FIG. 3 by the control device shown in FIG. As shown in FIGS. 4 and 5, engine control unit 300 determines whether or not water temperature sensor 200 malfunctions in step (step) S1000. Process (step) when water temperature sensor 200 malfunctions
If it is determined in S1000, the engine control unit 300
Determines in step (S1100) whether or not the engine of the automobile is operating. If it is determined in step (step) S1000 that water temperature sensor 200 is not malfunctioning, engine control section 300 determines in step (step) S1200 whether or not the engine is operating.

If it is determined in step S1200 that the engine is not running, the engine control unit 3
00 is no runspark f
an logic) (process (step) S130)
0). Step (step) when the engine is running
If it is determined in S1200, the engine control unit 300
Determines in step (1400) whether FRPM, which is an input variable indicating the RPM of the fan for cooling the cooling water circulating through the radiator, the engine, and the cooling / heating system, is 0. If the FRPM is 0, the process (step) S140
If it is determined to be 0, the engine control unit 300 determines that the variable TH
E1 is set as the COOLDEG (process (step) S15)
00). If the FRPM is not 0, the process (step) S14
00, the engine control unit 300 calculates
The calculation of THE1 ← COOLDEG + KFANLOTHY is executed (process (step) S1600). Here, THE1 is a variable. In step (step) S1700, engine control section 300 compares THE1 whose value has been set in step (step) S1500 or step (step) S1600 with the KDEGL.

If it is determined in the step (step) S1700 that THE1 is not less than KDEGL, the engine control unit 3
00 determines the control region based on the COOLDEG and executes the FRPM (COOLDEG) logic to calculate the target fan RPM (step (step) S1800).

If it is determined in step (step) S1700 that THE1 is lower than KDEGL, engine control section 300 determines whether or not fuel supply has been interrupted (step (step) S1900). . When it is determined in step (step) S1900 that the fuel supply is not interrupted, engine control unit 300 determines whether or not the air conditioner is operating (step (step) S2000). When it is determined in step (step) S2000 that the air conditioner is operating, the engine control unit 300 sets the frpm to the KFRPMH without a time delay because the specific fan enable condition is satisfied (step (step)). Step) S2100, S220
0). That is, in step (step) S2100, engine control section 300 sets the value of FANTR to $ FF. The FANTR indicates a fan delay timer for enabling the fan or increasing the fan RPM.

If it is determined in the step (step) S1900 that the fuel supply has been interrupted, the engine control unit 30
0 determines whether the air conditioner is in operation (process (step) S2300). If it is determined in step (step) S2300 that the air conditioner is operating, the engine control unit 300 determines whether the fan is operating.
It is determined whether the RPM is 0 or not (process (step) S240)
0). Process (step) S2 if the RPM of the fan is 0
If it is determined at 400, the engine control unit 300
THE2 is set to KFANACH which is a calibration parameter indicating the pressure hysteresis of the air conditioner for turning on the high-speed fan (process (step) S250)
0). Step (step) if the fan RPM is not 0
If it is determined in S2400, engine control unit 300 executes the calculation of the formula THE2 ← KFANACH-KFANAC (process (step) S2600). Here, KFANAC is a calibration parameter indicating a pressure threshold of the air conditioner for turning on a high-speed fan, and THE2 is a variable. In step (step) S2700, engine control unit 300 sets THE2 set in step (step) S2500 or step (step) S2600 to FLAC, which is an input variable indicating the head pressure of the air conditioner.
Compare with PRES.

If it is determined in step (step) S2700 that THE2 is not more than FLACPRES, engine control section 300 sets frpm to the KFRPMH (step (step) S2800). Process (step) S290
At 0, the engine control unit 300 performs the fan-on logic to determine the control area and set the values of the variables having KIS, KIDI, and KIFDN. In step (S3000), the engine control unit 300 performs a fan-off logic to determine the control area and set a value of a variable having KIDFN.

If it is determined in step (step) S1100 that the engine is running, the engine control unit 30
0 advances the procedure to the step (step) S2900.
After performing step (step) S1800, engine control section 300 causes the procedure to proceed to step (step) S2900. After performing the step (S2800), the engine control unit 300 executes the procedure (step) S290.
Advance to zero. Process (step) S2100 and S22
After performing 00, the engine control unit 300 advances the procedure to step (S2900).

If it is determined in step S1100 that the engine is not running, the engine control unit 3
00 advances the procedure to the step (step) S3000. If it is determined in step S2000 that the air conditioner is not operating, the engine control unit 30
0 advances the procedure to step (step) S3000.
Process (step) when the air conditioner is not running
If it is determined in S2300, engine control section 300 causes the procedure to proceed to step (step) S3000. Said
If THE2 is greater than FLACPRES, step (step) S2
If it is determined in 700, the engine control unit 300 causes the procedure to proceed to step (step) S3000.

FIGS. 6 and 7 are flow charts for explaining the fan-on logic included in the method described in FIGS. As described in FIGS. 6 and 7, the engine control unit 3
00 is the value of the frpm and the current RP of the fan.
Compare with FRPM indicating M (process (step) S290)
1). If it is determined in step (step) S2901 that the frpm is equal to or higher than the FRPM, the engine control unit 3
00 compares the frpm with KFRPM2 (process (step))
S2902). If it is determined in step (step) S2902 that the frpm is smaller than the KFRPM2, the engine control unit 300 compares the frpm with the KFRPM1 (step (step) S2903).

If it is determined in step S2903 that the frpm is smaller than the KFRPM1, the engine control unit 300 sets KIS, which is a variable indicating a time delay, to KIS1 when the fan is turned on (step S2903). (Step) S
2904). KIS1 is a calibration parameter indicating a first fan-on time delay in the first control region. Process (step) if the frpm is above KFRPM1
When determined in S2903, engine control section 300 sets the KIS to KIS2 (step (step) S290).
5). KIS2 is a calibration parameter indicating a second fan-on time delay in the second control region.

If it is determined in step S2902 that the frpm is equal to or higher than the KFRPM2, the engine control unit 3
00 compares the frpm with the KFRPMH (process (step) S2906). If it is determined in step (step) S2906 that the frpm is smaller than the KFRPMH, the engine control unit 300 sets the KIS to KIS3 (step (step) S2907). KIS3 is a calibration parameter indicating a third fan-on time delay in the third control region. If it is determined in step (step) S2906 that the frpm is equal to or higher than the KFRPMH, the engine control unit 300 sets the KIS to KIS4 (step (step) S2908). KIS4 is a calibration parameter indicating a fourth fan-on time delay in the fourth control region.

At step (step) S2909, engine control section 300 determines at step (step) S2904, S
In any one of the steps 2905, S2907 and S2908, the KIS whose value is set is compared with the value of FANTR. The FANTR indicates a fan delay timer for enabling the fan or increasing the fan RPM.

If it is determined in step (step) S2909 that the KIS is greater than the value of FANTR, the engine control unit 300 increases the value of FANTR by 1 (step (step) S2910). If it is determined in step (step) S2909 that the KIS is equal to or smaller than the value of FANTR, the engine control unit 300 compares the frpm with the KFRPM2 (step (step) S2911). If it is determined in step (step) S2911 that the frpm is smaller than the KFRPM2, the engine control unit 300 compares the frpm with the KFRPM1 (step (step) S291).
2).

If it is determined in step (step) S2912 that the frpm is smaller than the KFRPM1, the engine control unit 300 sets KIDI1, which indicates the amount of compensation related to the operation of the idle valve, to KIDI1 (step (step) S29).
13). KIDI1 is a calibration parameter indicating the number of idle air control processes added to the first control region. If it is determined in step (step) S2912 that the frpm is equal to or larger than the KFRPM1, the engine control unit 300 sets the KIDI to KIDI2 (step (step) S2914). KIDI2 is a calibration parameter indicating the number of idle air control processes added to the second control region.

If it is determined in step (step) S2911 that the frpm is equal to or higher than the KFRPM2, the engine control unit 3
00 compares the frpm with the KFRPMH (process (step) S2915). If it is determined in step (step) S2915 that the frpm is smaller than the KFRPMH, the engine control unit 300 sets the KIDI to KIDI3 (step (step) S2916). KIDI3 is a calibration parameter indicating the number of idle air control processes added to the third control region. The frpm is
If it is determined in step (step) S2915 that it is equal to or higher than KFRPMH, engine control section 300 sets KIDI to KIDI4 (step (step) S2917). KIDI4 is a calibration parameter indicating the number of idle air control processes added to the fourth control region.

In step (step) S2918, engine control unit 300 determines in step (step) S2913, S
In any one of 2914, S2916 and S2917, an IDFAN is set by the KIDI whose value has been set. The IDFAN is a variable indicating an idle air control motor step added to the fan when the fan RPM increases.

In step (S2919), the engine control unit 300 sets the FRPM at the frpm in order to update the value of the FRPM indicating the target fan RPM. In step (step) S2920, the engine control unit 300 initializes the value of FANTR to 0.

Process (Step) In step S2921, the engine control unit 300 initializes the value of FNDCYTR indicating the decay step counter of the IDFAN to 0. As described in FIG. 7, the engine control unit 300 sets the value of the IDFAN to 0.
(Process (step) S2922). The frpm
Is smaller than the FRPM in step (step) S2901, engine control section 300 causes the procedure to proceed to step (step) S2922. After performing step (step) S2910, engine control section 300 advances the procedure to step (step) S2922.

Process when the IDFAN is 0 (step)
If it is determined in S2922, the engine control unit 300 causes the procedure to proceed in step (step) S2921. Said
If it is determined in step S2922 that the IDFAN is not 0, the engine control unit 300 sets the FRPM to the KF
It is compared with RPM2 (process (step) S2923). Said
If FRPM is smaller than KFRPM2, step (step) S29
23, the engine control unit 300
PM is compared with the KFRPM1 (process (step) S292)
4).

If it is determined in step (step) S2924 that the FRPM is smaller than the KFRPM1, the engine controller 300 sets KIDFN, which is a variable indicating the decay time of the idle valve compensation amount, to KIDFN1 (step (step)). ) S2925). KIDFN1 is a calibration parameter indicating a first fan idle air control damping step count for the first control region. FRPM
When it is determined in step (S2924) that the KID is not less than the KFRPM1, the engine control unit 300 sets the KID
FN2 is set (process (step) S2926). Said K
IDFN2 is a calibration parameter indicating a second fan idle air control decay step count for the second control region.

When it is determined in step (step 2292) that the FRPM is equal to or larger than the KFRPM2, the engine control unit 3
00 compares the FRPM with the KFRPMH (process (step) S2927). When it is determined in step (step) S2927 that the FRPM is smaller than the KFRPMH, the engine control unit 300 sets the KIDFN to KIDFN3 (step (step) S2928). KIDFN3 is a calibration parameter indicating a third fan idle air control damping step count for the third control region.

If it is determined in step S2927 that the FRPM is equal to or higher than the KFRPMH, the engine control unit 3
00 sets KIDFN to KIDFN4 (process (step) S2929). KIDFN4 is a calibration parameter indicating a fourth fan idle air control damping step count for the fourth control region.

At step (step) S2930, engine control unit 300 determines at step (step) S2925, S
The KIDFN, the value of which has been set in any one of steps 2926, S2928 and S2929,
Compare with the value of TR. If it is determined in step (step) S2930 that the KIDFN is greater than the value of the FNDCYTR,
The engine control unit 300 increases the value of the FNDCYTR by 1 (step (step) S2931). If the KIDFN is equal to or smaller than the FNDCYTR, step (step) S2
If determined at 930, the engine control unit 300
The IDFAN is decreased by 1 and the value of the FNDCYTR is initialized to 0 (process (step) S2932 and S2933).

FIG. 8 is a flow chart for explaining the fan-off logic included in the method described in FIGS.
As described in FIG. 8, the engine control unit 300
It is determined whether FRPM is 0 or not (process (step) S301)
0). If the FRPM is not 0, the process (step) S301
0, the engine control unit 300 determines the IDFA
It is determined whether or not N is 0 (process (step) S302)
0).

Process when the IDFAN is 0 (step)
If it is determined in S3020, the engine control unit 300 initializes the value of FNDCYTR to 0 (step (step)).
S3030). In the process (step) S3040,
The engine control unit 300 initializes the value of FANTR to 0. In step (step) S3050, engine control section 300 initializes the FRPM to 0.

If IDFAN is not 0, the process (step)
If it is determined in S3020, the engine control unit 300
Compares the FRPM with the KFRPM2 (process (step) S3060). If it is determined in step (step) S3060 that the FRPM is smaller than KFRPM2, engine control section 300 compares the FRPM with KFRPM1 (step (step) S3070). If it is determined in step (step) S3070 that the FRPM is smaller than the KFRPM1, the engine control unit 300 sets the KIDFN to the KIDFN1 (step (step) S3080). If it is determined in step (step) S3070 that the FRPM is equal to or larger than the KFRPM1, the engine control unit 300 sets the KIDFN to the KFRPM.
IDFN2 is set (process (step) S3090).

If it is determined in step (step) S3060 that the FRPM is equal to or larger than the KFRPM2, the engine control unit 3
00 compares the FRPM with the KFRPMH (process (step) S3100). If it is determined in step (step) S3100 that the FRPM is smaller than the KFRPMH, engine control section 300 sets the KIDFN to the KIDFN3 (step (step) S3110). The FRPM is the KFRP
If it is determined in step (step) S3100 that it is equal to or higher than MH, engine control section 300 sets the KIDFN to the KIDFN4 (step (step) S3120).

At step (step) S3130, engine control unit 300 determines at step (step) S3080, S
3090, the KIDFN whose value has been set in any one of S3110 and S3120, and the FNDCY
Compare with the value of TR.

If it is determined in step (step) S3130 that KIDFN is greater than the value of FNDCYTR, engine control unit 300 increases the value of FNDCYTR by 1 (step (step) S3140). The KIDFN is the FND
If it is determined in step (step) S3130 that the difference is less than or equal to CYTR, the engine control unit 300 decreases the IDFAN by 1 and initializes the value of FNDCYTR to 0 (step (step) S3150 and S3160). FRPM is 0
If it is determined in the step (step) S3010 that the condition is, the engine control unit 300 ends the procedure.

FIG. 9 is a flowchart illustrating the no-lance spark fan logic included in the method described in FIGS. As described in FIG. 9, the engine control unit 300 determines whether the FRPM is 0 (step (step) S1310). If it is determined in step (step) S1310 that the FRPM is 0, the engine control unit 30
0 sets the variable THE3 to the COOLDEG (process (step) S1320). If it is determined in step S1310 that the FRPM is not 0, the engine control unit 30
0 executes the calculation of the formula THE3 ← COOLDEG + KFANLOTHY (process (step) S1330). Process (step) S
At 1340, engine control unit 300 compares the value of THE3, whose value was set in step (step) S1320 or step (step) S1330, with KFANCT. Said
KFANCT is a calibration parameter indicating the critical temperature of cooling water for fan enable and air conditioner off.

If it is determined in step (S1340) that THE3 is equal to or larger than the KFANCT, the engine control unit 300 sets the variable frpm indicating the fan RPM to the KFR.
PML is set (process (step) S1350). In process (step) S1360, the engine control unit 30
Since 0 corresponds to the specific fan enable condition, the procedure proceeds to step (step) S2900 without time delay. That is, in step (step) S1360, engine control section 300 sets the value of FANTR to $ FF. If it is determined in step (1340) that the THE3 is lower than the KFANCT, the engine control unit 30
0 advances the procedure to step (step) S3000.

FIG. 10 is a flowchart for explaining the FRPM (COOLDEG) logic included in the method described in FIGS. As described in FIG. 10, the engine control unit 300
Compares the COOLDEG with the KDEG2 (step (step) S1801). If it is determined in step (step) S1801 that COOLDEG is greater than or equal to KDEG2, engine control section 300 compares COOLDEG with KDEGH (step (step) S1802). When it is determined in step (S1802) that the COOLDEG is equal to or higher than the KDEGH, the engine control unit 300 determines that the control region is the fourth control region, and sets the frpm to the KFRPMH.
(Process (step) S1803).

When it is determined in step (step) S1802 that the COOLDEG is lower than the KDEGH, the engine control unit 300 executes the calculation of the equation a ← KDEGH-KDEG2 (step (step) S1804). Process (step) S
After performing 1804, the engine control unit 300 determines
Execute b ← KFRPMH-KFRPM2 calculation (process (step))
S1805). After performing the step (step) S1805, the engine control unit 300 sets the variable c to the KFRPM2 (step (step) S1806). After performing step (S1806), the engine control unit 300
Executes the calculation of the formula x ← COOLDEG-KDEG2 (process (step) S1807).

When it is determined in step (S1801) that COOLDEG is smaller than KDEG2, the engine control unit 300 determines the control region.
Compare COOLDEG with KDEG1 (process (step) S1)
808). When it is determined in step (step) S1808 that the COOLDEG is equal to or larger than the KDEG1, the engine control unit 300 executes a calculation of a formula a ← KDEG2-KDEG1 (step (step) S1809). Process (step) S
After performing 1809, the engine control unit 300 determines
b ← Execute KFRPM2-KFRPM1 calculation (process (step))
S1810). After performing the step (step) S1810, the engine control unit 300 sets the variable c to the KFRPM1 (step (step) S1811). After performing step (S1811), the engine control unit 300
Executes the calculation of the formula x ← COOLDEG-KDEG1 (process (step) S1812).

If it is determined in step (step) S1808 that COOLDEG is lower than KDEG2, engine control section 300 compares COOLDEG with KDEGL (step (step) S1813). The COOLDEG is the KDEGL
If it is determined in step (S1813) that the value is lower than the above, the engine control unit 300 sets the frpm to the KFRPML (step (S1814)).

If it is determined in step (step) S1813 that COOLDEG is equal to or larger than KDEGL, engine control section 300 executes the calculation of equation a ← KDEG1-KDEGL (step (step) S1815). Process (step) S
After performing 1815, the engine control unit 300
b ← Execute KFRPM1-KFRPML calculation (process (step))
S1816). After performing the step (step) S1816, the engine control unit 300 sets the variable c to the KFRPML (step (step) S1817). After performing step (S1817), the engine control unit 300
Executes the calculation of the formula x ← COOLDEG-KDEGL (process (step) S1818).

Step (Step) In step S1819, the engine control unit 300 executes the calculation of the formula frpm ← x × b / a + c. After performing the step (step) S1819, the engine control unit 300 executes the procedure (step) S29.
Proceed to 00. Process (step) S1807, S1
After performing any one of the steps 812 and S1818, the engine control unit 300 advances the procedure to a step (step) S1819. Process (step) S1
After performing one of the steps 803 and S1814, the engine control unit 300 advances the procedure to a step (step) S2900.

Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the embodiments, and a person having ordinary knowledge in the technical field to which the present invention belongs departs from the spirit and spirit of the present invention. Rather, the invention could be modified or changed.

[0065]

As described above, in the method and apparatus for variably controlling the speed of the cooling fan motor in the automobile according to the present invention, the temperature of the cooling water is normally sensed by the water temperature sensor and the engine is controlled. When the air conditioner is operating while the air conditioner is operating, the fan motor is immediately driven. On the other hand, the temperature of the cooling water is abnormally sensed by the water temperature sensor, and the fan motor is driven if the engine is operating. Also, the engine control unit optimally controls the speed of the fan motor based on the control area determined according to the sensed temperature of the cooling water and the RPM of the cooling fan.
Power and load conditions required to drive the fan motor are minimized.

Accordingly, when the coolant temperature sensor malfunctions or the accurately sensed coolant temperature sensing signal is not provided to the engine control unit, the coolant motor does not operate even though the coolant temperature rises, and the coolant water does not operate. The phenomenon of boiling and overflowing outside is prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an ordinary automobile cooling fan motor control device.

FIG. 2 is a block diagram showing a circuit configuration of a vehicle cooling fan motor control device according to one embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a cooling water temperature and a target fan RPM which defines a control region for variably controlling the RPM of the fan when the temperature of the cooling water is a driving condition of the cooling fan;

4 is a flowchart illustrating a method for variably controlling the RPM of the fan in the control region shown in FIG. 3 by the control device shown in FIG. 2;

FIG. 5 is a flowchart illustrating a method for variably controlling the RPM of the fan in the control region shown in FIG. 3 by the control device shown in FIG. 2;

FIG. 6 is a flowchart illustrating fan-on logic included in the method described in FIGS. 4 and 5;

FIG. 7 is a flowchart illustrating fan-on logic included in the method described in FIGS. 4 and 5;

FIG. 8 is a flowchart illustrating fan-off logic included in the methods described in FIGS. 4 and 5;

FIG. 9 is a flowchart illustrating the no-lance spark fan logic included in the method described in FIGS. 4 and 5;

FIG. 10 shows the FRPM (C) included in the method described in FIGS. 4 and 5.
OOLDEG) Flow chart explaining logic.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 operation sensor 110 operation detection signal 200 water temperature sensor 210 water temperature detection signal 300 engine control unit 300A switching element 310 control signal 400 fan motor 500 relay 600 high voltage cutoff switch 700 pressure sensor 710 pressure detection signal 800 variable resistor 900 fan RPM sensor 910 speed Sensing signal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F04D 27/00 101 F04D 27/00 101A // F01P 11/16 F01P 11/16 E

Claims (39)

[Claims] (A) detecting a malfunction of a water temperature sensor and an operation of an engine; and (B) performing a no-lance spark fan logic when it is determined in the step (A) that the engine is not operating. And (C) when it is determined in step (A) that the engine is running, the variable THE based on the FRPM indicating the RPM of the fan.
Set a value of 1 and change the THE1 to cooling water temperature vs. target fan RPM.
(D) comparing the temperature of the cooling water with KDEGL, which is the calibration parameter indicating the minimum cooling water temperature, in the graph of (D); FRPM to determine the control region based on the input variable COOLDEG with the currently sensed temperature value and calculate the desired fan RPM
(COOLDEG) Logic execution, and (E) Inspection of fuel supply interruption status based on the comparison result of THE1 and KDEGL in step (C), and air conditioner is operated based on the inspection result (F) determining whether or not the air conditioner is operating when it is determined in step (E) that the fuel supply is interrupted; (G) Process when the air conditioner is operating (E)
(H) setting the value of the variable THE2 based on the FRPM, and comparing the THE2 with FLACPRES which is an input variable indicating the head pressure of the air conditioner; and (H) the THE2 is equal to or less than the FLACPRES. Is determined in step (G), the variable frpm is a calibration parameter KFRPMH, which is a calibration parameter indicating the target maximum RPM in the graph.
(I) determining the control area and performing fan-on logic to set the value of a variable having KIS, KIDI and KIDFN; and (J) determining the control area; Performing a fan-off logic to set the value of a variable having KIDFN. A method for variably controlling the speed of a cooling fan motor. 2. The control area has coordinates (KDEGL, KDEGL,
(KFRPML) and a first control region defined by a part of the graph located between (KDEG1, KFRPM1), and a coordinate of the graph located between (KDEG1, KFRPM1) and (KDEG2, KFRPM2). A second control region defined by a portion, a third control region defined by a portion of the graph located between coordinates (KDEG2, KFRPM2) and (KDEGH, KFRPMH), and a coordinate value of which is ( KDEGH, KFRPMH), a fourth control region defined by the portion of the graph above, and a calibration parameter indicating the cooling water temperature hysteresis for low speed, fan disabled, and the temperature of the cooling water in the graph. 2. The method for variably controlling the speed of a cooling fan motor according to claim 1, further comprising: a KFANLOTHY having a predetermined interval in a negative direction from the KDEGL on an axis. 3. The control area is set to variably control the speed of the cooling fan when the temperature of the cooling water is a driving condition of the cooling fan, and a slope of a graph belonging to the second control area is set. 3. The method for variably controlling the speed of a cooling fan motor according to claim 2, wherein is greater than a slope of a graph belonging to the first or third control region. 4. The KDEGL, KDEG1, KDEG2, and KDEGH
Are the minimum cooling water temperature for the target minimum fan RPM, the first cooling water temperature,
3. The cooling according to claim 2, wherein the second cooling water temperature and a calibration parameter indicating a maximum cooling water temperature for a target maximum fan RPM, wherein KDEGL <KDEG1 <KDEG2 <KDEGH. A method for variably controlling the speed of a fan motor. 5. The KFRPML, KFRPM1, KFRPM2, and KFRPM
H is a calibration parameter indicating the target fan RPM in KDEGL, KDEG1, KDEG2, and KDEGH, respectively, and when the temperature of the sensed cooling water is equal to or higher than the KDEGH, the RPM of the cooling fan is the KFRPMH. Is controlled to maintain
When the temperature of the cooling water is equal to or lower than the KDEGL, the cooling fan R
3. The method for variably controlling the speed of a cooling fan motor according to claim 2, wherein PM is maintained at a target minimum fan RPM KFRPML, wherein KFRPML <KFRPM1 <KFRPM2 <KFRPMH. . 6. The step (A) includes: (i) determining whether a water temperature sensor malfunctions; and (ii) determining if the water temperature sensor malfunctions in the step (i). Determining whether the engine is running; and (iii) determining if the water temperature sensor does not malfunction (i).
And determining whether the engine is running if the determination in step (a) is negative. 3. The method according to claim 1, further comprising: determining whether the engine is running. 7. The speed of the cooling fan motor according to claim 6, further comprising a step of proceeding to the step (I) when it is determined in the step (ii) that the engine is running. To variably control the 8. The method according to claim 6, further comprising the step of proceeding to the step (J) when it is determined in the step (ii) that the engine is not running. A method for variably controlling. 9. The step (C) includes: (v) when it is determined in the step (iii) included in the step (A) that the engine is operating, a fan for cooling cooling water; Is an input variable that indicates the RPM of the FRP
(Vi) when the FRPM is determined to be 0 in the step (v), the variable THE1 is set to the COOLDEG; and (vii) the FRPM is 0. If it is not determined in the step (v), the step of executing the calculation of the formula THE1 ← COOLDEG + KFANLOTHY (where the THE1 is a variable); and (viii) the step (vi) or the step (vi).
2. The method for variably controlling the speed of a cooling fan motor according to claim 1, further comprising: comparing the value of THE1 set in i) with the KDEGL. 10. The step (E) comprises: (X) the step (C) wherein the THE1 is lower than the KDEGL;
And (xi) determining whether or not the fuel supply is interrupted in the step (viii), and determining in the step (x) that the fuel supply is not interrupted. If the air conditioner is in operation, a step of determining whether the air conditioner is in operation, and (xii) if it is determined in step (xi) that the air conditioner is in operation, a specific fan enable condition is satisfied. 2. The method for variably controlling the speed of a cooling fan motor according to claim 1, further comprising setting the frpm to the KFRPMH without delay. 11. When it is determined in the step (xi) that the air conditioner is not operating, the step (J) is performed.
2. The method according to claim 1, further comprising the step of:
0. A method for variably controlling the speed of a cooling fan motor according to 0. 12. The method as claimed in claim 10, further comprising the step of proceeding to the step (I) after performing the step (xii). the method of. 13. The cooling fan motor according to claim 1, further comprising a step of proceeding to the step (J) when it is determined in the step (F) that the air conditioner is not operating. For variably controlling the speed of a vehicle. 14. The step (G) includes: (xiv) determining whether or not the RPM of the fan is 0 when it is determined in the step (F) that the air conditioner is operating. (Xv) the step (xiv) when the RPM of the fan is 0;
Setting the variable THE2 to KFANACH, which is a calibration parameter indicating the pressure hysteresis of the air conditioner for turning on the high-speed fan, and (xvi) the step if the RPM of the fan is not 0. (X
iv) if it is determined, the process of executing the calculation of the formula THE2 ← KFANACH-KFANAC (where KFANAC is a calibration parameter indicating a pressure threshold of an air conditioner for turning on a high-speed fan, THE2 is a variable); (xvii) the process (xv) or the process (xv
comparing the THE2 set in i) with FLACPRES which is an input variable indicating the head pressure of the air conditioner, and variably controlling the speed of the cooling fan motor according to claim 1, wherein Way for. 15. The cooling fan motor according to claim 14, further comprising a step of proceeding to the step (J) when it is determined in the step (xvii) that the THE2 is larger than the FLACPRES. For variably controlling the speed of a vehicle. 16. The method as claimed in claim 1, further comprising the step of proceeding to the step (I) after performing the step (D). the method of. 17. The method as claimed in claim 1, further comprising the step of proceeding to the step (I) after performing the step (H). the method of. 18. The step (I) includes: (I-1) comparing the set value of the frpm with a FRPM indicating a current RPM of the fan; and (I-2) determining the control region. In order to do so, the frpm is compared with the target fan RPM including the KFRPM1, KFRPM2 and KFRPMH, and is a variable indicating a time delay when the fan is turned on at a predetermined value given to the determined control region. A step of setting a KIS; and (I-3) the KI whose value has been set in the step (I-2).
Comparing S with a FANTR indicating a fan delay timer to enable the fan or increase the fan RPM; and (I-4) the step (I-3) if the KIS is greater than the value of the FANTR. And (I-5) when it is determined in the step (I-3) that the KIS is equal to or smaller than the value of the FANTR, In order to determine the control region, the frpm is converted to the KFRPM1, KFRPM2, and KFPM.
Setting a KIDI indicating a compensation amount related to the operation of the idle valve with a predetermined value given for the determined control region, as compared with a target RPM having an RPMH, and (I-6) increasing the fan RPM. Setting an IDFAN, which is a variable indicating an idle air control motor step added to the fan, to the KIDI whose value was set in the step (I-5); (I-7) Update the value of the FRPM to the frpm,
Initializing the value of the FANTR to 0; and (I-8) FND indicating a decay step counter of the IDFAN.
(I-9) comparing the value of the IDFAN with 0, (I-10) comparing the value of the IDFAN with 0, and (I-10) determining whether the IDFAN is not 0.
When determined in 9), to determine the control region, the FRPM is compared with the target RPM having the KFRPM1, KFRPM2, and KFRPMH, and a predetermined value to be given to the determined control region. Setting a KIDFN that is a variable indicating the decay time of the idle valve compensation amount in (I-11) comparing the KIDFN, the value of which is set in the step (I-10), with the value of the FNDCYTR (I-12) when it is determined in the step (I-11) that the KIDFN is larger than the value of the FNDCYTR,
(I-13) If it is determined in the step (I-11) that the KIDFN is equal to or smaller than the FNDCYTR, the IDFAN
2. The method for variably controlling the speed of a cooling fan motor according to claim 1, further comprising the step of: reducing the value of FNDCYTR to 0 by a predetermined value. 19. When it is determined in the step (I-1) that the frpm is smaller than the FRPM, the step (I-
The method for variably controlling the speed of a cooling fan motor according to claim 18, further comprising the step of proceeding to 9). 20. After performing the step (I-4),
The method for variably controlling a speed of a cooling fan motor according to claim 18, further comprising the step of proceeding to the step (I-9). 21. If the IDFAN is 0, the process (I-
19. The method for variably controlling the speed of a cooling fan motor according to claim 18, further comprising the step of proceeding to the step (I-8) when it is determined in the step (9). 22. The process (I-2) comprising the steps of (xix-
2) comparing the frpm with the KFRPM2 when it is determined in the step (I-1) that the frpm is equal to or higher than the FRPM; and (xix-3) the step (xix-3) when the frpm is smaller than the KFRPM2. xix-2), the frpm is set to
Comparing the KIS with the KFRPM1; and (xix-4) determining the KIS as the first fan-on time in the first control region if the frpm is determined to be smaller than the KFRPM1 in the step (xix-3). (Xix-5) when it is determined in the step (xix-3) that the frpm is equal to or greater than the KFRPM1, in the second control region. Setting the KIS with a calibration parameter KIS2 indicating a second fan-on time delay; and (xix-6) determining that the frpm is equal to or greater than the KFRPM2 in the step (xix-2). , The frpm to the KFRP
Comparing with MH; and (xix-7) indicating a third fan-on time delay in the third control region if it is determined in step (xix-6) that the frpm is less than the KFRPMH. (Xix-8) when it is determined in the step (xix-6) that the frpm is equal to or higher than the KFRPMH, the process of setting the KIS3 which is a calibration parameter and the KIS; 19. The method for variably controlling the speed of a cooling fan motor according to claim 18, comprising a calibration parameter KIS4 indicating a fourth fan-on time delay and a step of setting the KIS. Method. 23. The method according to claim 23, wherein the step (i-5) comprises: (xix-11) determining that the KIS is equal to or smaller than the value of the FANTR in the step (I-3).
(Xix-12) comparing the frpm with the KFRPM1 when it is determined in the step (xix-11) that the frpm is smaller than the KFRPM2; and (xix-13) If it is determined in step (xix-12) that the frpm is smaller than the KFRPM1, the KIDI is calculated by a calibration parameter indicating the number of idle air control processes to be added to the first control region. A certain kidi
(Xix-14) an idle air control step added to the second control region when the step (xix-12) determines that the frpm is equal to or greater than the KFRPM1. (Xix-15) when the step (xix-11) determines that the frpm is equal to or larger than the KFRPM2, the step (xix-15) Said
(Xix-16) an idle air control step added to the third control region when it is determined in the step (xix-15) that the frpm is smaller than the KFRPMH. KIDI3, which is a calibration parameter indicating the number of
And (xix-17) an idle air control step added to the fourth control region when it is determined in the step (xix-15) that the frpm is equal to or higher than the KFRPMH. 20. The method for variably controlling the speed of a cooling fan motor according to claim 18, comprising a calibration parameter KIDI4 indicating the number of KIDIs and a step of setting the KIDI. 24. The step (I-7) comprising: (xix-19) setting the FRPM to the frpm in order to update a value of the FRPM indicating the target fan RPM; (xix-20) 19. The method for variably controlling the speed of a cooling fan motor according to claim 18, comprising a step of initializing the value of FANTR to 0. 25. The step (i-10) includes the steps of: (xix-26) the step (I-10) when the IDFAN is not 0.
(Xix-22) when the FRPM is smaller than the KFRPM2; and (xix-27) when the FRPM is smaller than the KFRPM2. (Xix-28) when the FRPM is smaller than the KFRPM1 in the step (xix-27).
Is set to KIDFN1, which is a calibration parameter indicating a first fan idle air control damping step count for the first control region; and (xix-29) the step (xix) when the FRPM is equal to or larger than the KFRPM1. KIDF, a calibration parameter indicating the second fan idle air control damping step count for the second control region, as determined at -27).
(Xix-30) when the FRPM is determined to be equal to or greater than the KFRPM2 in the step (xix-26), the FRPM is set to the KIDFN.
(Xix-31) a third fan idle air control decay step count for the third control region if it is determined in step (xix-30) that the FRPM is less than the KFRPMH Is a calibration parameter indicating
Setting the KIDFN3 and the KIDFN; and (xix-32) a fourth fan idle air control for the fourth control region when it is determined in the step (xix-30) that the FRPM is equal to or higher than the KFRPMH. KIDF, a calibration parameter showing the decay step count
19. The method for variably controlling the speed of a cooling fan motor according to claim 18, comprising N4 and setting the KIDFN. 26. The step (J) comprising: (J-1) determining whether the compensation amount is 0 based on an input variable FRPM indicating a sensed RPM of the fan and IDFAN indicating a compensation amount of an idle valve. (J-2) when it is determined in the step (J-1) that the IDFAN is 0, FNDCYTR indicating a damping step counter of the IDFAN, FANTR indicating a fan delay timer, and FR
Initializing PM to 0, respectively; and (J-3) the step (J-1) when the IDFAN is not 0.
If determined in the above, in order to determine the control region, the FRPM is the target RPM having the KFRPM1, KFRPM2 and KFRPMH
KIDFN indicating the decay time of the idle valve compensation amount at a predetermined value given for the determined control region in comparison with
(J-4) comparing the KIDFN, the value of which has been set in the step (J-3), with the value of the FNDCYTR; and (J-5) the KIDFN is the value of the FNDCYTR. If it is determined in the step (J-4) that the value is larger than the predetermined value, the step of increasing the value of the FNDCYTR by a predetermined value; 2. The method according to claim 1, further comprising: a step of reducing the IDFAN by a predetermined value and initializing the value of the FNDCYTR to 0 when the determination is made. Way to do. 27. The step (J-1) includes: (xx-1) determining whether the FRPM is 0; and (xx-2) determining whether the FRPM is not 0.
And determining whether or not IDFAN, which is a variable indicating an idle air control motor step added to the fan when the fan RPM increases, is 0 when the determination is made in 1). 27. A method for variably controlling the speed of a cooling fan motor according to claim 26. 28. When said FRPM is 0, said step (xx-
The method for variably controlling the speed of a cooling fan motor according to claim 27, further comprising a step of terminating the step (J-2) when it is determined in (1). 29. The step (J-2), wherein: (xx-3) if the IDFAN is 0,
If determined in 1), the step of initializing the value of the FNDCYTR to 0; and (xx-4) setting the value of FANTR indicating a fan delay timer for enabling the fan to increase and increasing the fan RPM to 0. 27. The method for variably controlling the speed of a cooling fan motor according to claim 26, comprising the steps of: (xx-5) initializing the FRPM to zero. 30. The step (J-3), wherein: (xx-6) if the IDFAN is not zero, the step (J-
(Xx-7) comparing the FRPM with the KFRPM2 if determined in 1); and (xx-7) determining if the FRPM is smaller than the KFRPM2 in the process (xx-6) if the FRPM is smaller than the KFRPM2.
(Xx-8) when it is determined in the step (xx-7) that the FRPM is smaller than the KFRPM1, the KIDFN is controlled by the first fan idle air control for the first control region. (Xx-9) setting the FRPM equal to or larger than the KFRPM1 in the step (xx-7) if the FRPM is equal to or larger than the KFRPM1; Setting KIDFN2, which is a calibration parameter indicating the second fan idle air control decay step count, and the KIDFN, and (xx-10) in the step (xx-6) when the FRPM is equal to or larger than the KFRPM2. If determined, the FRPM is converted to the KFRPMH
(Xx-11) when it is determined in the step (xx-10) that the FRPM is smaller than the KFRPMH, a third fan idle air control attenuation step count for the third control region is calculated. KIDF is the calibration parameter shown
(Xx-12) a fourth fan idle air control for the fourth control region when it is determined in the step (xx-10) that the FRPM is equal to or higher than the KFRPMH; 27. The method for variably controlling the speed of a cooling fan motor according to claim 26, comprising: setting a KIDFN4 as a calibration parameter indicating a damping step count and setting the KIDFN. 31. The process (B) comprises: (B-1) a variable THE3 based on FRPM indicating a fan RPM;
KFAN indicating the critical temperature of the cooling water
(B-2) If it is determined in the step (B-1) that the THE3 is equal to or larger than the KFANCT, the frpm is set to the KFRPML, and the step (B-2) is performed without delay. (B-3) when it is determined in the step (B-1) that the THE3 is lower than the KFANCT, the step proceeds to the step (J). The method for variably controlling the speed of a cooling fan motor according to claim 1. 32. The step (B-1) includes: (iv-1) determining whether the FRPM is 0; and (iv-2) the step (iv-1) when the FRPM is 0. If determined, the variable THE3 is set to the COOLDEG; and (iv-3) if the FRPM is not 0, the step (iv-
If judged in 1), the formula THE3 ← COOLDEG + KFANLOTHY
(Iv-4) the step (iv-2) or the step (i).
v-3) comparing the THE3 set with the value with KFANCT which is a calibration parameter indicating a critical temperature of cooling water for fan enable and air conditioner off. A method for variably controlling the speed of a cooling fan motor according to claim 31. 33. In the step (B-2), (iv-5) when it is determined in the step (B-1) that the THE3 is equal to or larger than the KFANCT, the frpm is changed to the KFRPML.
32. The cooling fan motor according to claim 31, further comprising: (iv-6) a step of proceeding to the step (I) without time delay because the specific fan enable condition is satisfied. For variably controlling the speed of a vehicle. 34. The step (D) includes the steps of: (D-1) determining the control region by using the COOLDE
Comparing G with the KDEG2 and KDEGH, respectively; and (D-2) when it is determined in the step (D-1) that the COOLDEG is equal to or greater than the KDEGH, the control region is the fourth control region. Setting the frpm to the KFRPMH; and (D-3) when it is determined in the step (D-1) that the COOLDEG is lower than the KDEGH, the control area is changed to the third control area. And the RPM of the fan in the third control area
Calculating a, b, c and x in order to determine (D4), if it is determined in the step (D-1) that the COOLDEG is lower than the KDEG2, Comparing the COOLDEG with the KDEG1; and (D-5) determining that the COOLDEG is higher or equal to the KDEG1 in the step (D-4), determining the second control region; Calculating a, b, c, and x to determine the RPM of the fan in the second control region; and (D-6) determining that the COOLDEG is lower than the KDEG1 in the step (D-4). If determined, replace the COOLDEG with the KDEGL
(D-7) when it is determined in the step (D-6) that the COOLDEG is lower than the KDEG1, the step of setting the frpm to the KFRPML; and (D-8) the COOLDEG Is determined in the step (D-6) to be equal to or larger than the KDEGL, the control region is determined to be the first control region, and in order to determine the RPM of the fan in the first control region, a) calculating a, b, c and x; (D-9) performing a calculation of an equation frpm ← xxb / a + c; and (D-10) after performing the above-described step (D-9). And (D-11) performing any one of the steps (D-3), (D-5) and (D-8).
(D-12) performing one of the processes (D-2) and (D-7), and then performing the process (I). 2. The method for variably controlling the speed of a cooling fan motor according to claim 1, wherein the method comprises the steps of: 35. The step (D-1) comprising: (ix-1) determining the control area by using the COOL.
Comparing DEG with KDEG2; and (ix-2) comparing COOLDEG with KDEGH if it is determined in step (ix-1) that COOLDEG is greater than or equal to KDEG2. The method for variably controlling the speed of a cooling fan motor according to claim 34. 36. (ix-4) When it is determined in the step (D-1) that the COOLDEG is lower than the KDEGH, the equation a <-COOL
(Ix-5) performing the calculation of the equation b <−KFRPMH-KFRPM2 after performing the step (ix-4); and (ix-6) the step of performing the calculation of the equation b <−KFRPMH−KFRPM2. (Ix-5) setting the variable c to the KFRPM2 after performing (ix-5); and (ix-7) performing the calculation of the equation x <-COOLDEG-KDEG2 after performing the process (ix-6). The method for variably controlling a speed of a cooling fan motor according to claim 34, comprising the steps of: 37. In the step (D-5), (ix-9) when it is determined in the step (D-4) that the COOLDEG is equal to or larger than the KDEG1, the equation a <-KDEG2-KD.
(Ix-10) performing the calculation of the formula b <−KFRPM2-KFRPM1 after performing the process (ix-9); and (ix-11) performing the calculation (ix-11). After performing -10),
Setting a variable c to the KFRPM1; and (ix-12) performing the calculation of the equation x <-COOLDEG-KDEG1 after performing the step (ix-1). Item 35. A method for variably controlling a speed of a cooling fan motor according to Item 34. 38. The step (D-8), wherein: (ix-15) when it is determined in the step (D-6) that the COOLDEG is equal to or larger than the KDEGL, the equation a <-KDEG1-
(Ix-16) performing the step (ix-15) after performing the step (ix-15).
(Ix-17) performing the calculation of the formula b <−FRPM1-KFRPML, and (ix-17) after performing the process (ix-16).
Setting the variable c to the KFRPML, (ix-18) after performing the step (ix-17),
35. The method for variably controlling the speed of a cooling fan motor according to claim 34, comprising performing a calculation of a formula x <-COOLDEG-KDEGL. 39. Driving means for varying the magnitude of a driving voltage / current applied to a fan motor for rotating a cooling fan according to a control signal in order to lower the temperature of the cooling water, and sensed cooling. To calculate the fan RPM corresponding to the temperature of the water, set the area of the graph mapped by the cooling water temperature versus the target fan RPM as a number of control areas,
When the temperature of the cooling water determines the driving condition of the fan motor, the control region is determined, and a control signal corresponding to the determined control region is provided to the driving unit. An engine control means for setting the RPM of the cooling fan to a maximum value and providing a control signal corresponding to the set RPM to the driving means in the case of the driving condition of A device for variably controlling the speed of a motor.