KR100405708B1 - Heating system of vehicle and controlling method the same - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a heating system of a vehicle and a method of controlling the same so that the heating and defrosting of the vehicle can be performed quickly at the same time as starting the heating before the heating is normally operated by the heating of the cooling water.

Accordingly, the heating system of a vehicle according to the present invention uses a water pump in a heating system of a vehicle in which cooling water is circulated to an engine, a radiator and a heater core assembly, and is supplied with an auxiliary water pump, a preheater, a preheater, and an auxiliary water pump. The power supply means for supplying, and the control unit, and the auxiliary heater device consisting of the auxiliary thermostat is further installed structure.

Accordingly, 40 minutes of time was consumed to secure about 80% of the visible area on the windshield of the car after the formation of the defrost at -18 ° C or less. According to the present invention, the defrost is removed within 15 minutes from the start of removal. Defrosting performance is greatly improved, and quick heating is performed in winter or cold areas, greatly improving user convenience.

Description

Heating system of car and its control method {HEATING SYSTEM OF VEHICLE AND CONTROLLING METHOD THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating system of a vehicle, and more particularly, to a heating system of a vehicle and a method of controlling the same, which warms the interior of a vehicle using cooling water used for engine cooling.

In general, the heating system of an automobile is a system for circulating the inside of an engine to prevent the engine from overheating, and heat the cooling water with the outside air, and blow the outside air into the room using a blower to heat or remove the defrost.

Heat generated from the engine is generated as fuel is burned in the cylinder, and the temperature of the combustion gas generated at this time is about 2000 ° C to 2500 ° C, which damages components constituting the engine. The temperature of the engine is maintained at approximately 80 ° C to 90 ° C by the circulation of the temperature, that is, the cooling water.

Although it is preferable to efficiently heat the room by using the coolant heat exchanged with the engine, the engine efficiency is high in the case of the direct injection diesel engine, while the heat source decreases by about 30 to 40% during the initial start-up. For heating and defrosting, heating and defrosting is possible only after 40 minutes have elapsed since the initial start-up using the heated coolant.

6 schematically shows a heating system of a vehicle using a circulation of a conventional cooling water.

Even when the engine starts, the temperature of the engine coolant is below a certain temperature, that is, the thermostat 4 on the side of the radiator 2 is closed until warming up, which induces heating of the engine 6, and the coolant exceeds a certain temperature by heating the engine. When the temperature reaches 85 ° C., the thermostat 4 is opened to circulate the cooling water toward the radiator 2 and the heater core 8.

The coolant from the engine 6 is heat-exchanged in the heater core 8, and the external air heat-exchanged with the coolant in the heater core 8 is blown into the interior of the vehicle by the blower 10 to be used for heating and defrosting. .

A car equipped with such a direct injection diesel engine is usually heated for about 40 minutes after starting the engine to remove heat and defrost in winter or in cold climates, so the engine's coolant is heated. And inconvenience caused by vehicle noise.

Therefore, as a proposed solution, an auxiliary heater system is proposed in which warm air is formed in an auxiliary heater made of a hot wire coil and blown into the room until the cooling water is heated.

Auxiliary heater systems, however, do not provide satisfactory heating and defrosting effects and are also a cost driver.

In addition, in the case of the direct injection type diesel engine, the performance of the heat source is inevitably deteriorated at the start of the initial engine according to the development of the fuel efficiency improvement technology of the automobile such as the direct injection type diesel engine.

Accordingly, the present invention has been made to solve the problems described above, an object of the present invention is to enable the vehicle to quickly heat up the room and remove the defrost at the same time as the start before the heating is normally operated by the heating of the cooling water To provide a heating system.

Another object of the present invention is to provide a control method for controlling a heating system of a vehicle.

1 is a schematic view for explaining the circulation of the cooling water used in the heating system of a vehicle according to the present invention.

2 is a view schematically showing some structures of a heating system of a vehicle according to the present invention.

3 is an exploded perspective view showing the structure of a pre-heater used in a heating system of a vehicle according to the present invention.

4 is a flowchart illustrating a control method of a heating system of a vehicle according to the present invention.

5 is a schematic view for explaining the circulation of the cooling water used in the heating system of a vehicle according to the prior art.

In order to achieve the object as described above, the heating system of the automobile according to the present invention, in the heating system of the vehicle for circulating the coolant to the engine, radiator and heater core assembly using a water pump, an auxiliary water pump, a pre-heater, A power supply means for supplying power to the pre-heater and the auxiliary water pump, and a control unit, and an auxiliary heater device consisting of an auxiliary thermostat is further installed.

In order to achieve another object of the present invention, a control method of a heating system of a vehicle according to the present invention is a method of controlling a heating system of a vehicle by using an auxiliary heater device, a control unit, and an engine controller. In comparison, when the temperature of the engine coolant is less than or equal to the set temperature, some of the coolant is heated by the auxiliary heater device, and when the temperature of the engine coolant exceeds the set temperature, the auxiliary heater is stopped and the engine coolant and the some coolant are joined and controlled.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic view for explaining the circulation of the cooling water used in the heating system of a vehicle according to the invention, Figure 2 is a view schematically showing a part of the structure of the heating system, Figure 3 is a heating of the vehicle according to the invention An exploded perspective view showing the structure of a pre-heater used in the system.

As shown in Figure 1, the heating system of the car is a heating up of the coolant by the existing engine heating, and the car's interior heating and defrosting method, the first heating only the cooling water in the heater core until the thermostat is opened, the early heating Eliminate the effect and sexuality.

The heating system of the vehicle includes a water jacket 22 installed in the engine 20, a radiator 24 and a heater core 26 connected to the water jacket 22, and cooling water to the water jacket 22 and the radiator 24. And an auxiliary heating device according to the present invention in a general heating system including a water pump 28 for circulating to the heater core 26 and a thermostat 30 for circulating to the radiator 24 when the coolant rises to a constant temperature. 32) additionally installed.

As shown in FIG. 2, the auxiliary heater device 32 includes an auxiliary water pump 34 installed in the middle of a hose connected to the heater core 26 and the engine 20, and is installed in the heater core 34. Power supply means 40 for supplying power to the pre-heater 36 and the auxiliary water pump 34 through the pre-heater 36, the heater core 34 and the relay 38, and the pre-heater 36 The control unit 42 closes the auxiliary thermostat during operation and opens when the coolant temperature at the engine 20 becomes constant, and the coolant heated by the preheater 36 when the constant temperature becomes constant by the operation of the control unit 42. Part of the secondary thermostat 44 to be joined with existing circulating coolant.

As shown in FIG. 3, the preheater 36 has a PTC element 40 embedded in a housing 38 that is separated into two, and an electrode 42 is formed by an epoxy resin above and below the PTC element 40. Attached.

The heat generated when the voltage is applied to the PTC element 40 to start the heat should be discharged to the outside through the housing 38 to be described later. Otherwise, the resistance of the PTC element 40 rises rapidly due to the R-T characteristic of the PTC element 40, so that heat generation as long as desired is no longer possible.

The above-described housing 38 is made of aluminum, and in consideration of heat resistance and water resistance, the portion in contact with the cooling water is coated with an anodized oxide film.

And both ends of the PTC element 40 is connected to the auxiliary water pump 34, and is installed in the heater core 26 with the auxiliary thermostat 44 connected between both ends of the PTC element 40, the auxiliary thermostat ( Between the 44 and one end of the PTC element 40, a switch 46, a power supply 40, and a relay 38 are sequentially installed.

The pre-heaters 36 incorporating such PTC elements 40 are mounted on the top cover portion of the heater core 26 in one set of three.

The pre-heater 36 configured as described above has a resistance of 0.18 to 0.42 kW, an output of about 375 W ± 7%, and a performance of approximately 350 to 400 W, and has a small tolerance.

The pre-heater 36 has a characteristic of a pre-heater that should have more heat at low temperatures because the current consumed by the pre-heater slowly decreases with time, that is, as the temperature of the cooling water increases.

The control method of the heating system in which the auxiliary heater is installed as described above is communicated with the engine controller using the control unit and proceeds as follows.

In the step (50) of comparing and determining the outside temperature with the set temperature, the set temperature (coolant temperature) is set to -20 ° C to 10 ° C, and when the coolant temperature is within this range, the auxiliary heater device is automatically operated when the engine is started. , At a set temperature of 10 ° C ~ 15 ° C the user selects the on-off of the switch (60) to manually select whether or not to operate the auxiliary heater device.

For example, if the set temperature is set to 5 ° C., the auxiliary heater device is automatically operated at engine start if it is 5 ° C. or lower, otherwise the user manually selects 60 of the switch to be on and off and assists manually. The operation of the heater device is selected.

That is, when the user selects the switch on, the auxiliary heater device is operated 62, and when the user selects the switch off, the auxiliary heater device is not operated.

In step 70 of comparing the engine coolant with the set temperature, the operation of the preheater and the auxiliary pump is determined by determining whether the temperature of the coolant circulating the engine is higher or lower than the set temperature when the preheater is turned on. .

The set temperature is 80 ° C to 90 ° C, and more preferably, if the set temperature is 85 ° C and the engine coolant temperature is 85 ° C or lower, the engine coolant is continuously circulated and the preheater and the auxiliary pump are continuously turned on. Keep it.

That is, in the step 80 of heating some cooling water with the auxiliary heater device, some cooling water is heated by the pre-heater, and since the some cooling water is heated while being circulated only in the auxiliary heater device, the entire cooling water must be heated as in the prior art. Heating takes place in less time than this delay.

And stopping the auxiliary heater device and joining the engine coolant with some coolant (90) stops the operation of the preheater and the auxiliary pump to protect the heater core when the temperature of the engine coolant exceeds 85 ° C. The stat and auxiliary thermostat are opened to join some coolant heated by the auxiliary heater to the coolant circulating in the engine.

Accordingly, the coolant continuously circulates through the engine, the radiator and the heater core, and the heating is normally performed.

As described above, according to the heating system of the vehicle and the control method thereof according to the present invention, it takes 40 minutes to secure about 80% of the visible area of the frost on the windshield of the car after the frost formation at -18 ° C or lower. According to the present invention, defrosting is removed within 15 minutes from the start of removal, and the defrosting performance is greatly improved.

In addition, since the rapid heating is performed in the winter or a cold area, the user's convenience is greatly improved.

Claims (9)

A heating system of an automobile using coolant circulating in a circulation system including an engine, a radiator and a heater core assembly using a water pump, An auxiliary thermostat for blocking or joining the heat core assembly with the circulation system based on the temperature of the cooling water; An auxiliary water pump for circulating coolant in the heat core assembly when the heat core assembly is isolated from the circulation system; A pre-heater installed in the heater core assembly; Power supply means for supplying power to the pre-heater and the auxiliary water pump; It includes a control unit for controlling the opening and blocking of the auxiliary thermostat when driving the pre-heater, The control unit, The temperature of the engine coolant is compared with the set temperature, When the temperature of the engine coolant is less than or equal to the set temperature, the auxiliary thermostat is blocked to block the heat core assembly from the circulation system and to simultaneously control the preheater and the auxiliary water pump. When the temperature of the engine coolant exceeds the set temperature, the auxiliary thermostat is controlled to open to join the heat core assembly with the circulation system and to simultaneously control off the preheater and the auxiliary water pump. Heating system. The method according to claim 1, wherein the pre-heater, A heating system for an automobile, comprising a PTC element embedded in a housing and electrodes attached to upper and lower sides of the PTC element. The heating system of claim 2, wherein the housing is made of aluminum. The heating system of claim 2, wherein an anodized oxide film is coated on the surface of the housing. The method of claim 2, wherein both ends of the PTC element is connected to the auxiliary water pump, and an auxiliary thermostat installed at the heater core is connected between both ends of the PTC element, and between the auxiliary thermostat and one end of the PTC element. Heating system of a car, characterized in that the switch, power supply and relay is installed. In the method of controlling the heating system of the vehicle using the auxiliary heater device, the control unit and the engine controller, Comparing the engine coolant with a set temperature; Heating part of the cooling water with the auxiliary heater when the temperature of the engine cooling water is lower than the set temperature; Stopping the auxiliary heater device and joining the engine coolant and some coolant when the temperature of the engine coolant exceeds the set temperature; Control method of a heating system of a vehicle comprising a. The method according to claim 6, wherein the set temperature compared with the temperature of the engine coolant is 80 ° C to 90 ° C. The method of claim 6, wherein prior to the step of comparing the engine coolant with a set temperature, After detecting the outside temperature and comparing it with the set temperature, if the temperature is lower than the set temperature, the auxiliary heater is automatically operated when the engine is started. Otherwise, the user selects the switch on and off to manually operate the auxiliary heater. Control method of a heating system of a vehicle comprising the step of selecting. The method according to claim 8, wherein the set temperature compared with the outside air temperature is -20 ° C to 10 ° C.