KR101125377B1 - Control method of heat device for vehicle - Google Patents

Abstract

The present invention relates to a method for controlling a heating device of a car that heats a room using a coolant of an engine, the method comprising: a) after the heater is operated, whether the car is in an idle state, the outside temperature is below zero, and the blower is turned on. determining whether (on); b) If the step a) is satisfied, it comprises the step of supplying the coolant only to the heater core in the engine by closing the thermostat (thermostat) to block the coolant flow between the radiators in the engine.

As a result, when the vehicle is in an idle state, the outside temperature is below zero, and the blower is operated, the flow rate of the coolant supplied to the heater core may be increased without increasing the engine RPM, thereby realizing a heating effect almost the same as in driving.

Car, Heating, Engine, Coolant, Thermostat, Kids

Description

CONTROL METHOD OF HEAT DEVICE FOR VEHICLE}

1 is a schematic view for explaining the flow of cooling water used in the heating apparatus of a vehicle according to the present invention,

2 is a heating control block diagram of a vehicle according to the present invention,

3 is a flowchart illustrating a heating control of a vehicle according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: radiator 30: engine

40: thermostat 50: heater core

55 blower 60 control unit

The present invention relates to a method for controlling a heating device of a vehicle, and more particularly, when the outside temperature is below zero, an idle state, and a blower is operated, the cooling water flow rate on the heater core side is increased to improve heating performance. The present invention relates to a heating control method of a vehicle.

In general, the heating device of the vehicle is a system for circulating the inside of the engine to prevent the engine from overheating, heat the cooling water by heat exchange in the heater core, and blows warm air into the vehicle interior using a blower.

The heat generated from the engine is usually generated as the fuel in the cylinder is burned, and the temperature of the combustion gas generated at this time is about 2000 ° C to 2500 ° C, which damages the components constituting the engine, thereby lowering the engine efficiency. Thus, the temperature of the engine is maintained at about 80 ° C. to 90 ° C. by using the coolant, and the room is heated using the coolant that is heat-exchanged with the engine.

During the initial start-up of the engine (before warm-up), the coolant temperature is low and does not need to be cooled, and in order for the coolant temperature to reach the normal range quickly, the coolant flow needs to be shut off at the initial start-up. Thus, a thermostat is provided to block or open the coolant flow supplied from the water pump according to the coolant temperature.

That is, the thermostat is opened when the coolant temperature is higher than the set temperature to communicate the coolant to the radiator and the heater core side, and closed when the coolant temperature is lower than the set temperature to block the coolant flowing to the radiator side. At this time, the coolant from the engine is heat-exchanged in the heater core, the external air heat-exchanged with the coolant in the heater core may be blown into the interior of the vehicle by the blower and heated.

Here, since the engine RPM is high when the vehicle is running, the flow rate of the coolant supplied from the water pump to the heater core is large, so there is no big problem in heating the interior of the vehicle.

However, when the vehicle is idle, the engine RPM is low, so that the flow rate of the cooling water supplied from the water pump to the heater core is reduced. In particular, when the blower is operated about three to four stages in the outside air temperature is less than zero, there is a problem that the heating performance is lowered because the temperature of heat exchange with the outside air temperature is lower than the zero temperature because the amount of coolant is less.

Therefore, there is a method of increasing the engine RPM during idle to increase the flow rate of the cooling water supplied to the heater core. However, since the engine RPM is increased, there is a risk of sudden start or rapid acceleration.

Accordingly, an object of the present invention is to increase the flow rate of the coolant supplied to the heater core without raising the engine RPM when the vehicle is in the idle state, the outside air temperature is below zero, and the blower is operated. It is to provide a heating control method of the car to obtain.

According to the present invention, in the method of controlling a heating apparatus of a vehicle for heating a room using a cooling water of an engine, a) after the heater operation, whether the vehicle is in an idle state, and whether the outside temperature is below zero; Determining whether the blower is on; b) If the above step a) is satisfied, this is achieved by closing the thermostat to block the coolant flow between the radiators in the engine and supplying coolant only from the engine to the heater core.

Here, after the step a), further comprising the step of determining whether the radiator fan is on (on), if the radiator fan is on (on) the off the radiator fan (off) and then executes the step b) It is desirable to.

At this time, c) preferably further comprises the step of opening the thermostat when the cooling water temperature is above a predetermined temperature.

After the step c), if the cooling water temperature is lower than the predetermined temperature, it is preferable to return to the step b).

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in Figure 1, it will be described the flow of cooling water used in the heating apparatus of the vehicle according to the present invention.

The engine 30 is largely composed of a cylinder head and a cylinder block, and a water jacket 30a through which coolant communicates is formed in the cylinder head and the cylinder head and the cylinder block. Thus, before the engine 30 is warmed up, the thermostat 40 is closed and the engine 30 is heated. When the engine 30 is heated and the temperature is higher than a predetermined temperature, the thermostat 40 is opened, thereby cooling water. In the pump 20 flows toward the radiator 10 and the heater core 50 (see solid arrow in FIG. 1). At this time, the heater core 50 is heat-exchanged with the coolant supplied from the engine 30, the outside air heat-exchanged from the heater core 50 is blown into the interior of the vehicle through the blower 55 is heated to the interior.

When driving the vehicle, the RPM of the engine 30 is high, and the interior of the vehicle is sufficiently warmed through the above process (solid line arrow in FIG. 1). In addition, when the outside temperature is an image in an idle state where the RPM of the engine 30 is low, the outside temperature is heat-exchanged in the heater core 50 because the outside temperature is an image even though the coolant flow rate on the heater core 50 is low. The air is warm, so there is no big problem with heating performance.

However, when the outside air temperature is below zero in the idle state of the car, such as in winter, according to the above process (solid arrow in Fig. 1), the flow rate supplied toward the heater core 50 is smaller than during driving and the outside air is cold, so that the heater Since the outside air heat-exchanged with the core 50 is not warm enough, the heating performance of the room is degraded.

Thus, the present invention is the coolant flowing from the engine 30 to the radiator 10 by closing the thermostat 40 when the outside air temperature is below zero and the blower 55 is on in the idle state of the automobile (idle) It is characterized in that the coolant is supplied to only the heater core 50 from the engine 30 by blocking the flow of the coolant, thereby supplying the coolant which is almost the same as when traveling to the heater core 50 (see dotted arrow in FIG. 1). Therefore, the heating performance can be improved by compensating for the amount of coolant even when the outside air temperature is below zero when the vehicle is idle.

That is, as shown in FIG. 2, the outside air temperature detected by the outside air temperature sensor 3 is below zero, the vehicle speed detected by the vehicle speed sensor 2 is 10 km / h or less, and the blower 55 is turned on. When the signal is received, the controller 60 closes the thermostat 40 to block the flow path of the coolant flowing from the engine 30 to the radiator 10. Accordingly, the water pump 20 supplies only the amount of cooling water to the heater core 50 side, which is substantially the same as when driving, and thus the external air heat-exchanged in the heater core 50 can heat the room through the blower 55. have.

Meanwhile, when the driver presses the dehumidification button 35 for dehumidification, the radiator fan 15 is operated while the cooling device including the condenser is operated. At this time, the radiator fan 15 is operated because of the condenser. The temperature of the cooling water affected by) decreases. Therefore, even if the controller 60 closes the thermostat 40 to compensate the flow rate of the cooling water toward the heater core 50, the cooling water itself temperature is low, resulting in a decrease in the heating performance. Therefore, when the dehumidification button 35 is operated, the control unit 60 may turn off the radiator fan 15 to prevent the temperature of the cooling water from decreasing, and then close the thermostat 40.

By such a configuration, a method of controlling a heating apparatus of a vehicle according to the present invention will be described with reference to FIG. 3.

First, when the driver operates the heater (S1), the controller 60 determines whether the vehicle speed detected by the vehicle speed sensor 2 is in an idle state (that is, the vehicle speed is 10 km / h or less), and the outside air temperature sensor 3. It is determined whether the detected outside temperature is below zero or the blower 55 is on (S2).

If all of the above (S2) step is satisfied, the control unit 60 determines whether the radiator fan 15 is on (S3), and if the radiator fan 15 is on (off) and then off (off) (S4), the thermostat 40 is closed to supply coolant only from the water pump 20 to the heater core 50 side (S5). If, in step (S1), any one condition is not satisfied, the controller 60 recognizes that the heating performance is normal, so that the thermostat 40 is opened to cool the water to the radiator 10 and the heater core 50. ) To be supplied to both sides (S6).

When the thermostat 40 is closed by the above processes (S1, S2, S3, S4), the coolant temperature is increased. At this time, if the coolant temperature detected by the coolant temperature sensor 5 is about 100 ° C. or more (S7) ), The thermostat 40 is opened to supply the coolant to the radiator 10 side to lower the coolant temperature (S8), and when the dropped coolant temperature is 90 ° C. or lower (S9), the thermostat 40 is closed again. It is preferable to return to the step (S5). Accordingly, the engine 30 may be cooled by maintaining the cooling water at an appropriate temperature, and at the same time, the heating performance may be improved by compensating the flow rate toward the heater core 50 in a state in which the heating performance is deteriorated.

As described above, according to the present invention, when the heating performance of the blower is operated when the vehicle is idle when the outdoor air is below zero, such as winter, the state of deterioration, the thermostat to block the coolant flowing from the engine to the radiator It provides a control method of the heating device of the vehicle that can improve the heating performance by supplying almost the same amount of cooling water to the heater core by closing the.

In addition, when the radiator fan is turned on due to dehumidification or the like and the temperature of the cooling water is lowered, the radiator fan can be turned off to prevent the cooling water temperature from being lowered.

Claims (4)

In the heating control method of a vehicle for heating the room using the coolant of the engine, a) determining whether the vehicle is in an idle state, whether the outside temperature is below zero, and whether the blower is on after the heater is operated; b) if the step a) is satisfied, the method of controlling the heating apparatus of a vehicle, comprising: supplying coolant only from the engine to the heater core by closing a thermostat to block the flow of coolant between radiators in the engine; . The method of claim 1, After the step a), further comprising the step of determining whether the radiator fan is on (on), If the radiator fan is on, turning off the radiator fan and executing step b). 3. The method of claim 2, and c) opening the thermostat when the coolant temperature is 100 ° C. or higher. The method of claim 3, d) when the cooling water temperature is 90 ° C or less after step c) is returned to step b).

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