JP2000220455A - Cooling control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the hunting of cooling water temperature by providing a PTC heater for heating a thermostat for controlling the cooling water quantity carried to a radiator, an controlling the current-carrying to the PTC heater on the basis of the judgment result of the traveling state of a vehicle and/or the operating state of an internal combustion engine. SOLUTION: In an ECU 40 having detecting means for detecting atmospheric pressure, throttle opening, engine rotating speed, intake air temperature, cooling water temperature and ON/OFF state, etc., of air conditioner, and inputting the output signals thereof, the traveling state of a vehicle or the operating state of an internal combustion engine 2 is judged, and a PTC heater within a thermostat 24 is ON/OFF-controlled on the basis of the judgment result. Namely, when a climbing state is judged, and when the thermally damaged state of the internal combustion engine 2 is judged, the PTC heater is ON, respectively. When a low temperature state is judged, the PTC heater is OFF except in the climbing state and thermally damaged state, and when a high position is judged, the PTC heater is ON except in the low temperature state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling control device for an internal combustion engine, and more particularly to a cooling control device for an internal combustion engine provided with a PTC heater that operates by heating a thermostat.

[0002]

2. Description of the Related Art In a cooling control device for an internal combustion engine of a vehicle, when the cooling water heated by the internal combustion engine is circulated through a radiator, the cooling water in the internal combustion engine is maintained at a constant temperature. The amount of cooling water to the radiator is automatically controlled by a thermostat (temperature controller) according to the temperature condition.

[0003] Some thermostats are provided with a PTC heater that is turned on and off. In this structure, when the PTC heater is turned on, the thermostat wax and the like are rapidly warmed, the valve body of the thermostat opens widely, and a large amount of cooling water flows to the radiator. After the temperature of the cooling water drops, the wax etc. is maintained at a certain high temperature by the temperature of the cooling water, so that it acts like a thermostat with a low valve opening temperature. . In this case, when the set temperature at which the thermostat is opened is raised by about 5 to 10 ° C., when the PTC heater is off, fuel consumption and heater performance are improved, and when the PTC heater is on, the power The performance and cooling performance are improved.

[0004] Further, as such a cooling control device,
For example, Japanese Patent No. 2788596, JP-A-58-172.
No. 71, JP-A-62-38821, JP-A-Hei 1
No. 0-220633, JP-A-7-279666, and JP-A-10-169443. No. 2,788,596 discloses an operation member in which a working piston is fixed to an end opposite to a working piston in a housing, an electric heating element is provided in the working member, and the working piston and a valve member of a main valve are provided. By connecting to the valve member of the bypass valve,
In this case, even when the valve member of the main valve is in the closed position, the housing or the holder together with the housing or the holder forms a sealed portion for blocking the flow path of the cooling water, and the working piston and the working piston are connected through an open cage exposing the housing. It is a combination. Japanese Patent Application Laid-Open No. 58-17271 discloses a thermostat pellet container divided into two parts by a piston to form a first chamber and a second chamber, and a second wax pellet having a high melting point is formed in the second chamber. And a heater is attached to change the valve opening temperature in accordance with the operation state of the internal combustion engine. Japanese Unexamined Patent Publication No. 62-38821 discloses an apparatus in which a heat generating portion for generating an amount of heat which affects the position control of a valve means of a thermosensitive element is provided, and the position of the valve means is controlled at at least two different temperatures. It is. JP-A-10-
Japanese Patent Application Laid-Open No. 220633 discloses that a heat radiating end of a heat pipe is thermally connected to a temperature-sensitive case, and a heating end of the heat pipe is thermally connected to a housing or an electric heater arranged outside the housing. This improves the reliability of the valve opening temperature control. JP-A-7-27966
No. 6 discloses a control device which calculates a parameter such that an outlet water temperature of an internal combustion engine and various parameters detected in association with the operation of the internal combustion engine are such that the circulating cooling water has a water temperature corresponding to a load state of the internal combustion engine. Processing is performed, and the amount of cooling water is controlled based on the set value to improve the cooling effect. What is described in JP-A-10-169443 is
The temperature of the circulating fluid is finely adjusted by combining the adjustment of the opening amount of the fluid control valve with the control of the flow rate of the circulating fluid by the drive control of the circulating drive means.

[0005]

By the way, in the conventional cooling control device, it takes several seconds for the temperature of the cooling water to start decreasing even when the PTC heater is turned on. There was no immediate effect because it took another few seconds to finish. Also, if the PTC heater is frequently turned on and off, a large hunting of the temperature of the cooling water occurs, which lowers the durability of the thermostat and the PTC heater, and furthermore, the temperature of the cooling water becomes inappropriate. This is disadvantageous in that the performance is easily reduced.

[0006]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention automatically controls the amount of cooling water flowing to a radiator in accordance with the temperature of cooling water of an internal combustion engine mounted on a vehicle. In a cooling control device for an internal combustion engine provided with a PTC heater that is turned on and off so as to operate by heating the thermostat, a running state of the vehicle and / or an operating state of the internal combustion engine is provided. It is characterized in that control means for making a judgment and operating the PTC heater based on the judgment result is provided.

[0007]

According to the present invention, the PTC heater is turned on and off according to the running state of the vehicle and / or the operating state of the internal combustion engine. Therefore, the PTC heater is operated at an appropriate time to eliminate the need for the PTC heater. Reduce on / off operation and avoid hunting of cooling water temperature,
The durability of the thermostat or the PTC heater can be improved, and the temperature of the cooling water can be appropriately maintained to improve various performances.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 10 show an embodiment of the present invention. In FIG. 2, reference numeral 2 denotes an internal combustion engine mounted on a vehicle (not shown). This internal combustion engine 2
Cylinder block 4, cylinder head 6, and oil pan 8
And

A radiator 1 is provided in front of the internal combustion engine 2.
0 is set. The radiator 10 includes a core 1
2, an upper tank 14 and a lower tank 16, and a radiator fan 18 is provided at the position of the core 12.

An inlet hose 20 is provided between the cylinder head 6 and the upper tank 14 of the radiator 10. Also, the cylinder block 4 and the radiator 1
Outlet hose 2 between the lower tank 16
2 are provided. A thermostat (temperature control) is provided at the connection portion of the inlet hose 20 on the cylinder head 6 side.
24 are provided.

The thermostat 24 automatically controls the amount of cooling water flowing through the radiator 10 in accordance with the temperature of the cooling water of the internal combustion engine 2 to make the temperature of the cooling water in the internal combustion engine 2 appropriate. is there.

As shown in FIGS. 3 to 5, the thermostat 24 is of a wax type (pellet type) and includes a housing 26, a wax 28, a valve body 30, a valve seat 32, and a spring 34. P to heat
A TC heater 36 is provided. That is, when the valve is closed, the thermostat 24 returns the cooling water from the bypass passage 38 to the cylinder block 4 when the valve body 30 comes into contact with the valve seat 32 (FIG. 3).
Also, when the PTC heater 36 is turned off and the valve is opened, the valve body 30 is separated from the valve seat 32 by the first lift amount L1 to flow a predetermined amount of cooling water toward the radiator 10 (FIG. 4). Further, when the PTC heater 36 is turned on and the wax 28 is heated and the valve is opened, the valve body 30 moves from the valve seat 32 to the second lift amount L2 larger than the first lift amount L1. A further large amount of cooling water is caused to flow to the radiator 10 side only by separating (see FIG. 5).

The PTC heater 26 has a control means (ECM).
When the PTC power is supplied, the resistance value increases as the temperature rises. The control means 40 includes an atmospheric pressure sensor 42 for detecting an atmospheric pressure PA, a vehicle speed sensor 44 for detecting a vehicle speed SPD,
Throttle sensor 46 for detecting throttle opening TA
, An engine speed sensor (crank angle sensor) 48 for detecting the engine speed NE, an intake air temperature sensor 50 for detecting the intake air temperature THA, and a water temperature TH which is the temperature of the cooling water.
A water temperature sensor 52 for detecting W, a battery 54 for supplying power VB, an idle switch 56 that is turned on when the internal combustion engine 2 is in idle operation, and an air conditioner (not shown)
And an ignition key switch 60 connected to an ignition key (not shown).
Has contacted.

The control means 40 receives these various signals, determines the running state of the vehicle and / or the operating state of the internal combustion engine 2, and turns on / off the PTC heater 36 based on the determination result. is there.

More specifically, first, the control means 40 turns on the PTC heater 36 when it determines that the vehicle is running and / or the operating state of the internal combustion engine 2 is an uphill condition.

The determination of the uphill state is performed based on the flowchart of FIG. That is, when the program starts (step 202), first, from the map of the throttle opening STA for ascending determination in FIG. 7, the current engine rotational speed NE (rp) is constantly maintained at a constant cycle R (ms).
m) and the vehicle speed SPD (Km / h), the slope determination throttle opening STA (deg) is obtained, and as the slope determination condition, the throttle opening TA ≧ the slope determination throttle opening STA continues for a fixed time H (sec). It is determined whether or not the vehicle has been climbed (step 204). If the result of this step 204 is YES, it is determined that the vehicle is going uphill, and flag 1 is set (step 2).
06). On the other hand, if NO in step 204,
At present, it is determined whether or not the flag is 1 (step 20).
8) If this step 208 is YES, it is determined whether or not the throttle opening degree TA <the slope opening determination throttle opening degree STA has continued for a predetermined time I (sec) as a condition for canceling the uphill determination (step 210). Then, if this step 210 is YES, it is determined whether or not the idle switch 56 is on (step 212). If step 212 is YES and step 208 is NO, it is determined that the vehicle is in an uphill state and flag 1 is set (step 206). However, when the step 212 is NO and the step 208 is NO, it is determined that the vehicle is not in the uphill state, and the flag is set to 0 (step 214). Then, when the ignition key switch 60 is turned off,
This uphill determination is cleared, and flag 0 is set.

As described above, when determining the uphill condition, the PTC
The reason why the heater 36 is always turned on is that the highest power performance is required when climbing a hill, and the cooling performance is also severe. Also, even in cold weather, the engine speed NE and the engine load are high when climbing a hill,
A sufficient heater capacity can be ensured, and there is no need to turn off the PTC heater 36.

The control means 40 turns on the PTC heater 36 when the heat damage state is determined as the running state of the vehicle and / or the operating state of the internal combustion engine 2.

The determination of the heat damage state is performed based on the flowchart of FIG. That is, when the program starts (step 302), the vehicle speed SPD <the set vehicle speed J
(Km / h) is determined (step 304), and if this step 304 is YES, it is determined whether the intake air temperature THA ≧ the set intake air temperature K (° C.) (step 30).
6) If this step 306 is YES, it is determined that a heat damage has occurred, and the flag 1 is set (step 308). on the other hand,
If step 304 is NO, the intake air temperature THA
It is determined whether or not ≧ set intake air temperature L (° C.) (Step 3)
10). Here, there is a relationship of K> L. Step 3
If 10 is YES, it is determined that a heat damage state has occurred, and the flag 1
(Step 308). However, step 31
If 0 is NO, it is determined that there is no heat damage state, and the flag is set to 0 (step 312). Step 30
If NO in step 6, it is determined whether or not the air conditioner switch 58 is ON and the vehicle speed SPD <set vehicle speed S (Km / h) (step 314). And set the flag to 1 (step 308). If step 214 is NO, it is determined that there is no heat damage, and the flag is set to 0 (step 31).
2). When the ignition key switch 60 is turned off,
This heat damage judgment is cleared.

Thus, in the heat damage state,
The PTC heater 36 is turned on by the thermostat 2
4, since the set temperature of the operation of the wax 28 is basically raised, the cooling capacity is insufficient if the PTC heater 36 remains off during heat damage.
Further, since the valve opening temperature when the PTC heater 36 is turned on becomes lower than before, the cooling capacity is improved by keeping the PTC heater 36 turned on.

Further, the control means 40 turns off the PTC heater 36 except for a climbing state and a heat damage state when the low temperature state is determined as the running state of the vehicle and / or the operating state of the internal combustion engine 2. Things.

The determination of the low temperature state is performed based on the flowchart of FIG. That is, when the program is started (step 402), it is determined whether or not the intake air temperature THA ≦ the set intake air temperature N (° C.) (step 404). (Step 406). If NO in step 404, the intake air temperature THA> the set intake air temperature N (° C.) and the vehicle speed SPD ≧ the set vehicle speed P (Km / h)
Is determined to have continued for a predetermined time Q (sec) (step 408), and if this step 408 is YES, it is determined that the vehicle is not in a low temperature state, and the flag is set to 0 (step 410). If step 410 is NO, the current flag is continued (step 412). Then, when the ignition key switch 60 is turned off,
This low temperature determination is cleared.

As described above, the reason why the PTC heater 36 is always turned off in the low temperature state except for the climbing state and the heat damage state is that the heater performance is more important than the power performance at the low temperature. is there.

Further, the control means 40 turns on the PTC heater 36 except for a low-temperature condition, when the high-altitude condition is determined as the running condition of the vehicle and / or the operating condition of the internal combustion engine 2. .

This high altitude state is determined by the following equation: atmospheric pressure PA <set atmospheric pressure B (mmHg).

In this high altitude state, the PTC heater 36 is always turned on except in a low temperature state. Since the output of the internal combustion engine 2 decreases at high altitude, the PTC heater 36 is turned on. , To ensure power performance.

The control means 40 controls the PTC heater 36 when the idling operation state is determined as the running state of the vehicle and / or the operation state of the internal combustion engine 2 except for the uphill state, the heat damage state and the highland state. It works off.

This idle operation state is determined when the idle switch 56 is on.

In this idle operation state, basically, the PTC heater 36 is turned off to reduce fuel consumption and vibration. In addition, since the temperature of the cooling water rises and the atomization of the fuel is promoted, the combustion is stabilized, so that the rotation speed can be reduced and the fuel efficiency can be greatly reduced. On the other hand, in an uphill state, a heat damage state, and a high altitude state, the PTC heater 36 is turned on to improve the cooling performance and the power performance at the time of starting.

Further, the control means 40 turns on the PTC heater 36 except for the low-temperature state when the high-speed running state is determined as the running state of the vehicle and / or the operating state of the internal combustion engine 2. .

This high-speed running state is determined by vehicle speed SPD> set vehicle speed C (Km / h).

In this high-speed running state, power performance is required. Therefore, except for a low temperature state, the PTC heater 36 is always turned on to lower the temperature of the cooling water and improve the engine output. In high-speed running, since the engine speed NE and the engine load are high, the friction loss, the pumping loss, and the cooling loss of the internal combustion engine 2 are relatively small. Therefore, even if the temperature of the cooling water is increased, the fuel efficiency is reduced. Since the effect is small, there is no problem even if the temperature of the cooling water is kept low. Further, since the ON / OFF of the PTC heater 36 is not frequently repeated, it is possible to avoid occurrence of hunting of the temperature of the cooling water.

Further, the control means 40 determines that the throttle opening TA is equal to the set throttle opening TA except for a low-temperature condition, when it determines that the vehicle is running on a general road as the driving state of the vehicle and / or the operating state of the internal combustion engine 2. F (deg) or more, that is, throttle opening TA ≧ set throttle opening F (de
In g), the PTC heater 36 is turned on.

The general road traveling state is the low-side set vehicle speed D.
(Km / h) ≦ vehicle speed SPD ≦ higher set vehicle speed C (Km / h
h).

When the vehicle travels on a general road smoothly along a traffic flow on a general road, the PTC heater 36 is turned off in order to emphasize fuel consumption performance over power performance. When accelerating, power performance is required,
The PTC heater 36 is turned on. However, since it takes several seconds from when the PTC heater 36 is turned on until the temperature of the cooling water starts to decrease, the torque of the internal combustion engine 2 does not improve immediately after the accelerator pedal is depressed.

The control means 40 controls the PTC heater 36 when determining that the vehicle is running and / or the operating state of the internal combustion engine 2 is a city running state, except for a climbing state, a heat damage state and a high altitude state. It works off.

In this city running, vehicle speed SPD <set vehicle speed D
(Km / h).

In this city running state, if control such as the above-mentioned general road running is performed, the PTC heater 36 is frequently turned on and off, and hunting occurs in the temperature of the cooling water. In some cases, the time during which the accelerator pedal is depressed is large within a few seconds in most cases, and during this time, even if the PTC heater 36 is turned on, the temperature of the cooling water does not drop.

Further, the control means 40 sets an upper limit value A (° C.) and a lower limit value G (° C.) as limit values for the water temperature THW, which is the temperature of the cooling water, and sets the upper limit value A (° C.) for the water temperature THW. ,
By providing a guard at the lower limit G (° C.), the PTC heater 3
6 is turned on and off.

That is, when the water temperature THW ≧ the upper limit value A (° C.), the PTC heater 36 is turned on in any case, whereas when the water temperature THW <the lower limit value G (° C.), the PTC heater 36 is turned on regardless of the case. 36 is turned off.

As described above, the provision of the guard for the water temperature THW based on the limit value is performed when the PTC heater 36 is not turned on even if the temperature of the cooling water rises abnormally depending on the running conditions of the vehicle. This is because there is a possibility that the PTC heater 36 will not be turned off even though the temperature is sufficiently low.

Further, when the heater switch 62 connected to the heater (not shown) in the vehicle compartment and the blower switch 64 connected to the blower (not shown) are connected, the control means 40 controls the heater. When the switch 62 is on and the blower switch 64 is on, the low temperature state is determined as the running state of the vehicle and / or the operating state of the internal combustion engine 2.

This low temperature state is performed based on the flowchart of FIG. That is, when the program starts (step 502), it is determined whether the heater switch 62 is on and the blower switch 64 is on (step 504). If this step 504 is YES, it is determined that the temperature is low. To flag 1 (step 5
06) On the other hand, when the step 504 is NO,
A low temperature state is not determined, and flag 0 is set (step 50).
8).

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the program is started by the control means 40 (step 102), it is first determined whether or not the water temperature THW ≧ the upper limit value A (step 104). If this step 104 is YES, the PTC heater 36 is turned off. It is turned on (step 106).

If the answer in Step 104 is NO, it is determined whether or not the flag 1 is set in the uphill state (Step 10).
8). If this step 108 is YES, the water temperature T
It is determined whether HW ≧ lower limit G (step 110).
If this step 110 is YES, the PTC heater 36 is turned on (step 106). Step 1
If the answer is NO, the PTC heater 36 is turned off (step 112).

If the determination in step 108 is NO, it is determined whether the flag is 1 in the heat damage state (step 114). If this step 114 is YES, the process proceeds to step 110.

If the determination in step 114 is NO, it is determined whether the flag is 1 in a low temperature state (step 116). If YES in this step 116, P
The TC heater 36 is turned off (step 112).

If NO in step 116, it is determined whether or not the atmospheric pressure PA <the set atmospheric pressure B (118).
If this step 118 is YES, the process proceeds to step 110.

If step 118 is NO, it is determined whether or not the idle switch 56 is on (step 120). If this step 120 is YES, the PTC heater 36 is turned off (step 11).
2).

If step 120 is NO, it is determined whether or not vehicle speed SPD> set vehicle speed C (step 12).
2). If this step 122 is YES, the process proceeds to step 110.

If the determination in step 122 is NO, it is determined whether or not the low-side set vehicle speed D ≦ the vehicle speed SPD ≦ the high-side set vehicle speed C (step 124). This step 124 is YE
In the case of S, it is determined whether or not the throttle opening degree TA ≦ the set throttle opening degree F (step 126). If step 126 is YES, the process proceeds to step 110.

If NO in step 126 and NO in step 124, the PTC heater 36 is turned off (step 112).

As a result, the running state of the vehicle and / or the operating state of the internal combustion engine 2 is determined, and P is determined based on the determination result.
By operating the TC heater 36, the PTC heater 3
6 is operated at an appropriate time to reduce unnecessary on / off operation of the PTC heater 36, to prevent hunting of the temperature of the cooling water, and to prevent the thermostat 24 or the PTC
The durability of the heater 36 can be improved, the temperature of the cooling water can be appropriately maintained, and various performances can be improved.

That is, when climbing a hill, the power performance and cooling performance can be improved by turning on the PTC heater 36. In the event of heat damage, the PTC heater 36 is turned on to improve the cooling performance. At low temperatures, the PTC heater 36 can be improved. Turn off the PTC heater 36 to improve the heater performance, turn on the PTC heater 36 during high altitude running to improve the power performance, turn off the PTC heater 36 during idling to improve fuel efficiency, and use the PTC heater during high speed running. 36 to improve the power performance and reduce the occurrence of hunting in the temperature of the cooling water.
6 on to improve power performance,
The fuel consumption is improved by turning off the heater 36, and the PTC heater 36 is turned off to improve the fuel efficiency and reduce the occurrence of hunting in the temperature of the cooling water during city driving. Value (upper limit A (° C),
By providing a guard with the lower limit G (° C), P
The TC heater 36 can be operated reliably.

According to the above-mentioned contents, in the design,
The configuration can be simplified, the cost can be reduced, and the thermostat 24 can be reduced in weight.

In the present invention, as a special configuration, for example, when the temperature of the cooling water is high at the time of restarting warm-up or running at high temperature and low speed, the PTC heater is turned on to improve the cooling performance. Becomes possible. Further, depending on the running state of the vehicle and the operating state of the internal combustion engine, the power supply of the PTC heater is adjusted to adjust the lift amount of the valve body of the thermostat, and the amount of cooling water to the radiator is controlled to improve various performances. It becomes possible. Further, when the sensors fail for any reason, the amount of power to the PTC heater is fixed in accordance with the running state of the vehicle and the operating state of the internal combustion engine at that time. For example, the amount of power is reduced to 50%. Fix the wax heating state to about half, or fix the power supply to 0% to stop the wax heating, or fix the power supply to 100% to complete the wax. And various performances can be maintained according to the running state of the vehicle and the operating state of the internal combustion engine.

[0058]

As apparent from the above detailed description, according to the present invention, the control means for judging the running state of the vehicle and / or the operating state of the internal combustion engine and operating the PTC heater based on the judgment result is provided. By providing the PTC heater, the PTC heater is turned on / off according to the running state of the vehicle and / or the operation state of the internal combustion engine. Therefore, the PTC heater is operated at an appropriate time to reduce unnecessary on / off operation of the PTC heater. In addition, it is possible to avoid occurrence of hunting in the temperature of the cooling water, to improve the durability of the thermostat or the PTC heater, and to improve various performances by appropriately setting the temperature of the cooling water.

[Brief description of the drawings]

FIG. 1 is a flowchart of cooling control.

FIG. 2 is a system configuration diagram of a cooling control device.

FIG. 3 is a sectional view when the thermostat is closed.

FIG. 4 is a cross-sectional view showing a valve opening operation when a PTC heater of a thermostat is turned off.

FIG. 5 is a sectional view showing a valve opening operation when a PTC heater of a thermostat is turned on.

FIG. 6 is a flowchart of a climbing determination.

FIG. 7 is a diagram for setting a hill-climbing determination throttle opening during hill-climbing;

FIG. 8 is a flowchart of a heat damage determination.

FIG. 9 is a flowchart of a low temperature determination.

FIG. 10 is a flowchart of low-temperature determination when a heater switch and a blower switch are provided.

[Explanation of symbols]

 2 Internal combustion engine 10 Radiator 24 Thermostat 36 PTC heater 40 Control means

Claims (11)

[Claims] 1. A thermostat for automatically controlling the amount of cooling water flowing to a radiator in accordance with the temperature of cooling water of an internal combustion engine mounted on a vehicle, and turning on / off the thermostat so as to operate by heating the thermostat. In a cooling control device for an internal combustion engine provided with an activated PTC heater, a running state of the vehicle and / or an operating state of the internal combustion engine are determined.
A cooling control device for an internal combustion engine, further comprising control means for operating the PTC heater based on a result of the determination. 2. The PTC heater according to claim 1, wherein said control means turns on said PTC heater when determining a climbing state as a running state of said vehicle and / or an operating state of said internal combustion engine. 3. The cooling control device for an internal combustion engine according to claim 1. 3. The PTC heater is turned on when the control means determines a heat damage state as a running state of the vehicle and / or an operating state of the internal combustion engine. 2. The cooling control device for an internal combustion engine according to claim 1. 4. The control means, when judging a low temperature state as the running state of the vehicle and / or the operating state of the internal combustion engine, excludes the climbing state and the heat damage state, excluding the PT state.
2. The cooling control device for an internal combustion engine according to claim 1, wherein the C heater is turned off. 5. The control means activates the PTC heater except in a low-temperature state when determining a high altitude state as the running state of the vehicle and / or the operating state of the internal combustion engine. The cooling control device for an internal combustion engine according to claim 1, wherein 6. The PTC heater, excluding a climbing state, a heat damage state, and a high altitude state, when the control means determines an idling operation state as the traveling state of the vehicle and / or the operation state of the internal combustion engine. 2. The cooling control device for an internal combustion engine according to claim 1, wherein the controller is turned off. 7. The control unit according to claim 1, wherein when the high-speed running state is determined as the running state of the vehicle and / or the operating state of the internal combustion engine, the PTC heater is turned on except for a low-temperature state. The cooling control device for an internal combustion engine according to claim 1, wherein: 8. The control means, when judging a traveling state of a general road as a traveling state of the vehicle and / or an operation state of the internal combustion engine, excluding a low temperature state, the throttle opening is equal to or larger than a set throttle opening. The cooling control device for an internal combustion engine according to claim 1, wherein the PTC heater is operated to turn on the PTC heater. 9. The PTC heater according to claim 1, wherein the control means determines a running state of the vehicle and / or an operating state of the internal combustion engine in a city running state, excluding a climbing state, a heat damage state and a highland state. 2. The cooling control device for an internal combustion engine according to claim 1, wherein the controller is turned off. 10. The internal combustion engine according to claim 1, wherein the control means sets a limit value for the temperature of the cooling water, and turns on and off the PTC heater based on the limit value. Cooling control device. 11. The control unit according to claim 1, wherein when the heater switch connected to the heater in the vehicle compartment is on and the blower switch connected to the blower is on, the running state of the vehicle and / or the operating state of the internal combustion engine are set. The cooling control device for an internal combustion engine according to claim 4, wherein a low temperature state is determined.