KR102425351B1 - Blower unit of air conditioner for vehicle and method for controlling the same - Google Patents

Abstract

Disclosed are a blower device for an air conditioner for a vehicle and a method for controlling the same, which can uniformly control the amount of air flowing into a room by optimizing the trajectory of an indoor/outdoor switching door when the amount of air flowing into the room increases as the vehicle speed increases. A method of controlling a blower of an air conditioner for a vehicle includes: calculating a target discharge temperature using at least one of a set temperature, an outdoor temperature, an indoor temperature, and an amount of solar radiation; calculating a blower motor target voltage according to the calculated target discharge temperature; controlling the blower motor to the calculated target voltage; comparing the vehicle speed with the reference speed; and when the vehicle speed is greater than the reference speed, performing ram air compensation for linearly controlling the opening amount of the indoor/outdoor switching door according to the increase in the vehicle speed.

Description

BLOWER UNIT OF AIR CONDITIONER FOR VEHICLE AND METHOD FOR CONTROLLING THE SAME

The present invention relates to an air conditioner for a vehicle, and more particularly, to a blower device for an air conditioner for a vehicle and a control method thereof for selectively transferring bet or outside air into an air conditioning case of a vehicle.

In general, an air conditioner for a vehicle is a device that heats or cools a room by introducing external air into the room or circulating the air in the room to heat or cool it. An evaporator for cooling and a heater core for heating are configured inside the case. Air cooled or heated by the evaporator or heater core is selectively blown to each part of the vehicle interior.

1 is a cross-sectional view showing a blower of a conventional vehicle air conditioner. As shown in FIG. 1 , the blower 20 includes a blower case 22 , an inside/outside switching door 25 , and a blower 26 . The blower case 22 has an inside air inlet 24 and an outside air inlet 23 formed on the upper side, and the inside and outside air switching door 25 is installed to selectively open and close the inside and outside air inlets 24 and 23 . The blower wheel 26 forcibly blows the internal and external air introduced through the internal and external air inlets 24 and 23 toward the air conditioning case.

The blower 20 has an inner air inlet 24 and an outdoor air inlet 23 formed on both sides of the upper side, and while turning the inner air inlet 24 and the outdoor air inlet 23, the inner air inlet 24 and the outdoor air inlet 23 are formed. An intake unit having an indoor/outdoor switching door 25 that selectively opens and closes is provided. The blower 20 is installed inside the blower case 22 and blows the axial air flowing in from the inside air inlet 24 or the outside air inlet 23 in a radial direction. A blower wheel 26 and a blower wheel 26 ) is provided with a blower motor 27 for rotating the rotary shaft 271 is coupled to the blower wheel (26). An air filter 28 for purifying the incoming air is installed at the upper end of the blower wheel 26 .

According to the rotation of the blower wheel 26 and the operation of the indoor/outdoor switching door 25, vehicle indoor air or outdoor air is selectively introduced into the air conditioning case, and this air is passed through the evaporator along the inner flow path of the air conditioning case, or After cooling or heating by selectively passing the heater core through the operation of the temperature control door, the cooled or heated air is discharged to each part of the vehicle interior according to the opening and closing of a plurality of mode doors according to the air conditioning mode to cool the vehicle interior. ,heat or ventilate.

In the conventional blower device of an air conditioner for a vehicle, when the inside/outdoor switching door is in the outdoor air mode when the vehicle speed increases, the amount of air flowing into the vehicle interior due to the pressure difference between the inside and the outside (ram air) increases. increases For this reason, there is a problem in that indoor comfort is reduced.

To solve this ram air problem, when the vehicle speed increases, the voltage applied to the blower motor is lowered to control the amount of air flowing into the room. In this case, there is a problem in that the above-described ram air problem cannot be solved at the lower limit voltage capable of controlling the driving of the blower motor.

In order to solve the conventional problems, in the present invention, when the amount of air flowing into the room increases while the vehicle speed increases, the trajectory of the indoor/outdoor switching door is optimized to provide a vehicle air conditioner capable of uniformly controlling the amount of air flowing into the room. A blower and a method for controlling the same are provided.

A blower device for an air conditioner for a vehicle according to the present invention includes a blower case having an inside air inlet for introducing bet air and an outside air inlet for introducing outside air, an inside/outdoor switching door for controlling the opening degree of the inside air inlet and the outside air inlet, a blower wheel and and a blower motor for rotating the blower wheel, and a ram air compensator for controlling a position of the indoor/outdoor switching door according to vehicle speed.

In addition, according to the present invention, a method for controlling a blower of an air conditioner for a vehicle includes: calculating a target discharge temperature using at least one of a set temperature, an outdoor temperature, an indoor temperature, and an amount of insolation; calculating a blower motor target voltage according to the calculated target discharge temperature; controlling the blower motor to the calculated target voltage; comparing the vehicle speed with the reference speed; and when the vehicle speed is greater than the reference speed, performing ram air compensation for linearly controlling the opening amount of the indoor/outdoor switching door according to the increase in the vehicle speed.

The blower device for an air conditioner for a vehicle and a control method thereof according to the present invention include a ram air compensator for controlling the position of the indoor/outdoor switching door according to the vehicle speed, thereby maintaining a constant amount of air flowing into the vehicle interior even when the vehicle speed increases. Accordingly, it is possible to provide comfort to the interior occupants.

1 is a cross-sectional view showing a blower of a conventional vehicle air conditioner,
2 is a cross-sectional view illustrating a blower of an air conditioner for a vehicle according to an embodiment of the present invention;
3 is a flowchart illustrating a method for controlling a blower of an air conditioner for a vehicle according to an embodiment of the present invention;
4 is a graph for explaining the ram air compensation logic of the blower according to an embodiment of the present invention;
5 to 7 are diagrams illustrating an application example of a blower of an air conditioner for a vehicle according to an embodiment of the present invention.

Hereinafter, the technical configuration of a blower for a vehicle air conditioner and a control method thereof will be described in detail according to the accompanying drawings.

2 is a cross-sectional view showing a blower of the air conditioner for a vehicle according to an embodiment of the present invention, FIG. 3 is a flowchart showing a method of controlling the blower of the air conditioner for a vehicle according to an embodiment of the present invention, FIG. 4 is It is a graph for explaining the ram air compensation logic of the blower according to an embodiment of the present invention, and FIGS. 5 to 7 show examples of application of the blower of the air conditioner for a vehicle according to an embodiment of the present invention.

2 to 7 , the blower 120 of an air conditioner for a vehicle according to an embodiment of the present invention blows air into a vehicle interior, and includes a blower case 122, an inside/outdoor switching door 125 and It comprises a blower wheel 126 and a blower motor 127 .

The blower case 122 includes an intake case for selectively introducing betting or outside air, and a scroll case provided under the intake case to blow air toward the air conditioning unit. In addition, an outside air inlet 123 for introducing a bet inlet 124 and outside air for introducing the bet on the upper side of the blower case 122 is formed.

The indoor and outdoor air switching door 125 is installed to selectively open and close the indoor air inlet 124 and the outdoor air inlet 123 . The inside and outside air conversion door 125 controls the opening degree of the inside air inlet 124 and the outside air inlet 123 . The inside and outside air conversion door 125 is formed in a dome shape that is rotated about a driving shaft, and the dome portion blocks the inside air inlet 124 or the outside air inlet 123 to control the opening degree.

The indoor/outdoor switching door 125 may be rotationally driven by being connected to an actuator (not shown) or rotationally driven by a connection means such as a wire connected to a controller. The rotation angle of the indoor/outdoor switching door 125 is appropriately compensated and controlled by the control unit 200 and the ram air compensation unit 400 to be described later.

The blower wheel 126 forcibly blows the inside and outside air introduced through the bet inlet 124 or the outside air inlet 123 toward the air conditioning case. The blower motor 127 has a rotating shaft 1271 coupled to the blower wheel 126 to rotate the blower wheel 126 . An air filter 128 for filtering foreign substances contained in the air is provided at an upper portion of the blower wheel 126 .

The blower of the vehicle air conditioner includes a sensor unit 300 , a control unit 200 , and a ram air compensation unit 400 .

The sensor unit 300 includes an outdoor temperature sensor, an indoor temperature sensor, a vehicle speed sensor, a solar radiation detection sensor, and the like. The control unit 200 receives information such as a set temperature, an outdoor temperature, an indoor temperature, an amount of solar radiation from the sensor unit 300 and calculates a target discharge temperature TD. In addition, the control unit 200 calculates a target voltage applied to the blower motor according to the calculated target discharge temperature. Also, the controller 200 controls the blower motor 127 with the calculated target voltage.

The ram air compensation unit 400 controls the position of the indoor/outdoor switching door 125 according to the vehicle speed. The ram air compensation unit 400 may achieve position control by controlling an actuator (or other driving means) for rotationally driving the indoor/outdoor switching door 125 to control the rotation angle of the indoor/outdoor switching door 125 . If the indoor/outdoor conversion door has a structure other than a dome shape, position control may be achieved by controlling a driving signal to a means for driving the indoor/outdoor conversion door.

As described above, as the ram air compensation unit 400 for controlling the position of the indoor/outdoor switching door according to the vehicle speed is provided, the air volume flowing into the vehicle interior is maintained constant even when the vehicle speed increases, thereby providing comfort to indoor occupants. can provide

The ram air compensator 400 linearly controls the opening amount of the indoor/outdoor switching door 125 according to an increase in vehicle speed. Therefore, as the vehicle speed increases, it is possible to perform stable control by controlling the opening amount of the indoor/outdoor switching door at a certain ratio.

The ram air compensator 400 reduces the amount of opening of the outdoor air inlet 123 of the indoor and outdoor air conversion door 125 as the vehicle speed increases. As the vehicle speed increases, the pressure difference between inside and outside increases, and the outside air tends to flow into the interior more than the intended amount. At this time, the LAN air compensator 400 closes the opening amount of the outdoor air inlet 123 more than before compensation to reduce the amount of air flowing into the outdoor air inlet 123 by a certain ratio. Accordingly, it is possible to effectively prevent an unintentional increase in the amount of air introduced into the room due to the pressure difference between the inside and the outside when the vehicle speed is increased in the outside air mode in which outside air is introduced.

Referring to FIG. 3 , a method for controlling a blower of an air conditioner for a vehicle according to an embodiment of the present invention includes the steps of calculating a target discharge temperature TD, calculating a target voltage, and controlling to a target voltage; , a speed comparison step, and a ram air compensation step.

First, the target discharge temperature is calculated using at least one of the set temperature, the outside temperature, the inside temperature, and the amount of solar radiation. Thereafter, the blower motor target voltage is calculated according to the calculated target discharge temperature. Thereafter, the blower motor 127 is controlled to be driven by the calculated target voltage of the blower motor. For example, it is possible to differentially control the blower motor from stage 1 to stage 6 in stages. In this case, the 1st stage is a low stage with a small air volume of the blower, and the 6th stage is a high stage with a large air volume of the blower.

Thereafter, the vehicle speed sensed by the vehicle speed sensor is compared with a preset reference speed. As a result of the comparison, if the vehicle speed is less than or equal to the reference speed, the step of controlling the driving of the blower motor 127 with the calculated blower motor target voltage is performed. If the vehicle speed is greater than the reference speed, ram air compensation is performed to linearly control the opening amount of the indoor/outdoor switching door according to the increase in the vehicle speed.

The RAM air compensation logic is as shown in FIG. 4 . The ram air compensator 400 differently controls the maximum opening amount of the indoor/outdoor switching door 125 according to the voltage applied to the blower motor 127 . That is, the ram air compensation unit 400 reduces the maximum opening amount of the indoor/outdoor switching door 125 according to an increase in the voltage applied to the blower motor 127 .

In FIG. 4 , for example, voltage A has three stages and voltage B has two stages. When voltage A is greater than voltage B, the control is made so that the maximum opening amount of voltage A is smaller than that of voltage B. In FIG. 4 , the horizontal axis indicates vehicle speed and the vertical axis indicates the opening amount of the intake outdoor air inlet. The vertical axis does not decrease the amount of opening toward the top, but increases as it goes toward the bottom. That is, an open amount of 50% means that half of the outdoor air inlet is closed and only half open, and an open amount of 80% means that 20% of the outdoor air inlet is closed and 80% open.

When the vehicle speed is greater than the reference speed, the ram air compensator 400 compensates and controls the opening amount of the indoor/outdoor switching door 125 by a predetermined amount. That is, in the pre-correction state in which the vehicle speed is equal to or less than the reference speed, the ram air compensator 400 does not perform compensation control. When the vehicle speed is greater than the reference speed, the opening amount of the indoor/outdoor switching door 125 is compensated and controlled so that the opening amount becomes 80%.

In other words, the ram air compensation unit 400 closes 20% of the bet inlet immediately when the vehicle speed reaches 110 km/h in the case of voltage A of FIG. 4 . Through this compensation control, it is possible to suppress excessive inflow of outside air through the outside air inlet at a relatively high vehicle speed. If the vehicle speed is greater than 110 km/h, the ram air compensator 400 linearly controls the opening amount of the indoor/outdoor switching door 125, and at a constant speed (150 km/h) or higher, the maximum opening amount is the same. perform control.

In the case of voltage A in FIG. 4 , as shown in FIG. 5 at a vehicle speed of 110 km/h, the inside and outside air switching door 125 is rotated so that the outside air inlet 123 has an opening amount of 80%. Thereafter, as the vehicle speed increases, the ram air compensator 400 closes the outdoor air inlet 123 by rotating the indoor and outdoor air switching door 125 at a predetermined rate. Thereafter, when the vehicle speed reaches 150 km/h, the internal/external air switching door 125 is positioned to have a 50% opening amount as shown in FIG. 6 .

In addition, in the case of voltage B in FIG. 4 , at a vehicle speed of 120 km/h, as shown in FIG. 5 , the inside and outside air switching door 125 is rotated so that the outside air inlet 123 has an opening amount of 80%. Thereafter, as the vehicle speed increases, the ram air compensator 400 closes the outdoor air inlet 123 by rotating the indoor and outdoor air switching door 125 at a predetermined rate. Thereafter, when the vehicle speed reaches 180 km/h, the indoor/outdoor switching door 125 is positioned to have a 60% opening amount as shown in FIG. 7 .

Up to now, the blower device for a vehicle air conditioner and a control method thereof according to the present invention have been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and that anyone skilled in the art can make various modifications and equivalent other embodiments therefrom. will understand the point. Accordingly, the true technical protection scope should be determined by the technical spirit of the appended claims.

120: blower
122: blower case 126: blower wheel
127: blower motor 1271: rotation shaft
123: outdoor air inlet 124: bet inlet
125: inside/outdoor switching door 126: air filter
200: control unit 300: sensor unit
400: ram air compensation unit

Claims (8)

A blower case 122 in which a bet inlet 124 for introducing a bet and an outdoor air inlet 123 for introducing outside air are formed, and an inside/outdoor conversion door for controlling the opening degree of the bet inlet 124 and the outdoor air inlet 123 In the blower device of an air conditioner for a vehicle comprising (125) and a blower wheel (126) and a blower motor (127) for rotating the blower wheel (126),
A ram air compensator 400 for controlling the position of the indoor/outdoor switching door 125 according to the vehicle speed to maintain a constant amount of air flowing into the vehicle interior even when the vehicle speed increases,
The ram air compensator 400 linearly controls the amount of opening of the outdoor air inlet 123 of the indoor and outdoor air conversion door 125 according to an increase in vehicle speed in a direction to decrease,
The ram air compensator 400 linearly controls the opening amount of the outdoor air inlet 123 of the indoor and outdoor air switching door 125, and does not reduce the maximum opening amount from a certain speed or more, but controls the same at a constant maximum opening amount. air conditioner blower. delete delete delete delete delete delete calculating a target discharge temperature using at least one of a set temperature, an outdoor temperature, an indoor temperature, and an amount of insolation; calculating a blower motor target voltage according to the calculated target discharge temperature; controlling the blower motor with the calculated target voltage; comparing the vehicle speed with the reference speed; and when the vehicle speed is greater than the reference speed, linearly control the opening amount of the outdoor air inlet of the indoor/outer air conversion door according to the increase in the vehicle speed to maintain a constant amount of air flowing into the vehicle interior even when the vehicle speed increases. performing ram air compensation;
The ram air compensator 400 linearly controls the amount of opening of the outdoor air inlet 123 of the indoor and outdoor air conversion door 125 according to an increase in vehicle speed in a direction to decrease,
The ram air compensator 400 linearly controls the opening amount of the outdoor air inlet 123 of the indoor and outdoor air switching door 125, and does not reduce the maximum opening amount from a certain speed or more, but controls the same at a constant maximum opening amount. Control method of blower of air conditioner.

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