KR101877343B1 - Apparatus and method for defogging of vehicle - Google Patents

Abstract

The present invention relates to a vehicular defogging apparatus and method, and more particularly, to a vehicular defogging apparatus and method that adjusts a compressor driven dephasing control entry point and a compressor driven dephasing control end point according to a humidity detected from a detector provided in an evaporator, Provided is a vehicular defogging apparatus and method capable of minimizing the operation of control, improving fuel economy, and securing a driver's watch.

Description

[0001] APPARATUS AND METHOD FOR DEFOGGING OF VEHICLE [0002]

The present invention relates to a vehicular defogging apparatus and method, and more particularly, to a vehicular defogging apparatus and method that adjusts a compressor driven dephasing control entry point and a compressor driven dephasing control end point according to a humidity detected from a detector provided in an evaporator, And more particularly, to a vehicular defogging apparatus and method capable of improving the fuel economy and securing the driver's watch by minimizing the control operation.

In general, the vehicle air conditioner 70 includes a variable capacity compressor 20 that is driven by an engine and compresses a refrigerant and whose discharge amount is changed according to a cooling demand amount, a condenser (not shown) for condensing the refrigerant discharged from the compressor 20 An electronic expansion valve (30) for expanding the refrigerant liquefied through the condenser (40) by adiabatically expanding the refrigerant to mix the gas and the liquid and changing the opening degree according to the refrigerant discharge amount of the compressor, And an evaporator (E) for cooling the ambient air using latent heat of evaporation when it is vaporized and then returning the refrigerant to the compressor.

1 is a sectional view showing an example of an air conditioner 70 for a vehicle.

The vehicle air conditioner 70 includes an air conditioner case 10 in which vents 11, 12, and 13 are installed to be opened by respective doors 11d, 12d, and 13d, respectively; A blower 14 connected to an air inlet of the air conditioner case 10 to blow outside air; An evaporator (E) and a heater core (H) provided in the air conditioning case (10); And a tempo door 15 for controlling the opening degree of the cool air passage P1 and the warm air passage P2 of the air conditioning case 10. [

In the vehicle air conditioner 70 configured as described above, when the cooling cycle is activated, the tempo door 15 opens the cold air passage P1 and closes the warm air passage P2. Therefore, the air blown by the blower 14 passes through the evaporator E, is exchanged with the cooling water flowing in the evaporator E and is converted into a cool air, flows toward the cool air passage P1, (11, 12, 13) to perform cooling of the vehicle interior.

When hot air touches a cold surface, the temperature of the air goes down. As the temperature decreases, the relative humidity reaches 100%. Water vapor, which no longer exists in the gaseous state, condenses and sticks to the cold surface. This phenomenon is expressed as fogging or steaming. The phenomenon of frost can be seen in many places. On a cold winter day, the surface of the windshield is frozen. This is due to condensation of water vapor as the hot air in the room, which contains much moisture, meets the cold window and the temperature falls and the amount of saturated water decreases. Generally, there is a temperature difference between the inside and the outside of the vehicle, and when the humidity inside the vehicle is high, fogging phenomenon occurs in which water vapor condenses (fogs) on the windshield of the vehicle and blocks the visual field. Therefore, most vehicles are provided with a defogging system for removing fog using air discharged through a defrost duct of an air conditioner in the event of a fog.

Relative humidity is the ratio of the actual water vapor amount (absolute humidity) to the saturated water vapor amount of a given temperature or the ratio of the actual water vapor pressure to the saturated water vapor pressure as a percentage. Since the amount of saturated water vapor varies with temperature, the relative humidity varies with temperature even if the amount of water vapor contained is constant. Relative humidity is the humidity used to indicate the degree of air humidity in everyday life. Water vapor pressure refers to the pressure of water vapor contained in the atmosphere. In particular, the saturated water vapor pressure is the water vapor pressure when the water vapor is maximally contained at a given temperature.

This dephogging system detects early occurrence of fog on the windshield of a vehicle and suppresses the occurrence of fog. In addition, it removes it early when fog occurs, thereby ensuring safety of the driver by securing a smooth clock for the driver, Can be improved.

In order to carry out the defogging of the vehicle windshield which caused the fogging phenomenon, the passenger operated the air conditioner or the heater manually. However, since the operation is troublesome and the safety operation is obstructed recently, And the defogging system is automatically operated when the fog occurrence is expected or fog occurs, thereby suppressing or eliminating the occurrence of the fog.

However, when the operating point of the defogging system is fast, there is a problem that the fuel consumption is low, and when the operation of the defogging system is delayed, the fogging phenomenon occurs. Therefore, It is applied as an important factor for improving the fuel efficiency of the vehicle.

Conventionally, the defogging system has been operated by using the temperature and humidity information inside the vehicle. However, it operates according to the humidity sensed by the humidity sensor (not shown) installed in the room regardless of the temperature and humidity of the air leaving the evaporator There is a problem that fog may occur when the outdoor humidity is high.

Although a method of controlling the defogging of the windshield of a vehicle by applying a constant attenuation ratio according to day and night information has been disclosed in Korean Patent Publication No. 2010-0100327 (titled "Defogging control method for vehicle windshield", Sep. 15, 2010) There is a need for improvement of the above-mentioned problems.

Japanese Patent Application Laid-Open No. 2005-053361 (Mar. 3, 2005, name: air conditioner for vehicle)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and a method for defogging a vehicle in which the time and the point of entry of the compressor driven dephasing control according to the humidity of the air passing through the evaporator The present invention provides a vehicular defogging apparatus and method capable of securing a driver's watch by defogging and improving fuel economy at the same time.

The vehicular defogging apparatus according to an embodiment of the present invention includes a vehicle defogging apparatus including a control means for operating the air conditioning apparatus to perform a plurality of defogging controls according to a size of a fog generation index (FP) A detecting unit (100) for detecting the humidity of air passing through the evaporator; And a controller for variably setting a compressor drive defogging control operation reference value and a compressor drive defogging control end reference value according to the magnitude of the humidity detected by the detector 100. When the fog generation index is less than or equal to a compressor drive defogging control operation reference value, And a controller (200) that performs non-drive defogging control and performs compressor drive defogging control (A / C On) when the compressor operation defogging control operation reference value is exceeded.
When the humidity detected by the detecting unit 100 is higher than the threshold value, the control unit 200 advances the compressor drive defogging control operation reference value. If the humidity detected by the detecting unit 100 is equal to or higher than the threshold value, When the humidity detected by the detection unit 100 is lower than the threshold value, the compressor driving de-regulation control stop reference value is delayed. If the humidity detected by the detection unit 100 is equal to or greater than the threshold value, And the defogging control stop reference value is advanced.

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Also, the compressor non-driving defogging control may include at least one of an outdoor mode switching and a de-frost (DEF) mode switching.

The fog generation index is detected using at least one of the temperature of the air passing through the evaporator, the humidity of the air passing through the evaporator, the vehicle speed, and the outside air temperature.

The method for defogging a vehicle according to an embodiment of the present invention includes a detection unit 100 and a control unit 200 and performs a plurality of dephasing controls according to the size of a fog occurrence index A defrosting method for a vehicle using a vehicle defogging apparatus including a control means for operating an air conditioner, the method comprising the steps of: adjusting a compressor drive defogging control operation reference value using the humidity of air passing through an evaporator detected by the detector (100) A compressor driving defogging control operation timing adjustment step (SlO); A compressor drive defogging control operation step (S20) in which the compressor drive defogging control is activated when the fog generation index is equal to or greater than the compressor drive defogging control operation reference value adjusted in the compressor drive defogging control operation timing adjustment step (S10); A compressor driving defogging control ending point adjusting step (S30) of adjusting a compressor driving dephasing control termination reference value using the humidity of air passing through the evaporator detected by the detecting unit (100); And a compressor driving dephasing control ending step (S40) in which the compressor driving dephasing control is ended when the fog generation index is equal to or lower than the compressor driving dephasing control end reference value adjusted in the compressor driving dephasing control end point adjusting step (S30); And a control unit.

In addition, the compressor driving defogging control operation timing adjustment step S10 includes a first relative humidity detection step S12 for detecting a relative humidity of air passing through the evaporator from the detection part 100; A first threshold value determination step (S13) of determining whether the relative humidity detected in the relative humidity detection step (S12) is equal to or greater than a threshold value; And adjusting the compressor drive defogging control operation reference value to operate at a lower fog occurrence index when the relative humidity is equal to or greater than the threshold at the first threshold value determination step (S13), and when the relative humidity is less than the threshold value, A compressor driven defogging control entry point adjustment step (S14) for adjusting the control operation reference value to operate at a higher fog occurrence index; And a control unit.

In addition, the compressor driving dephasing control ending point adjusting step S30 may include a second relative humidity detecting step S32 of detecting the relative humidity of the air passing through the evaporator from the detecting unit 100; A second threshold value determination step (S33) of determining whether the relative humidity detected in the relative humidity detection step (S32) is equal to or more than a threshold value; And adjusting the compressor-driven dephasing control termination value to operate at a higher fog generation index when the relative humidity is equal to or greater than the threshold at the second threshold value determination step (S33), and when the relative humidity is less than the threshold value, And a compressor drive defogging control end point adjustment step (S34) for adjusting the control end reference value to operate at a lower fog generation index.

The apparatus and method for vehicle defogging according to the present invention adjusts the operating point and the stop point of the compressor driven defogging control according to the humidity of the air passing through the evaporator, By minimizing the operating time of the control, it is possible to secure the driver's watch and improve the fuel efficiency reduction effect simultaneously.

More particularly, the apparatus and method for defogging a vehicle according to the present invention are designed to prevent the outside air from being blown out when the operating point of the compressor-driven defogging control is switched to the outside air when the humidity of the air passing through the evaporator is high, The problem of further increasing the humidity can be solved.

1 is a schematic view showing a general automotive air conditioner.
2 is a schematic view showing an air conditioner having a detection unit of a defogging apparatus using an evaporator temperature and humidity sensor according to the present invention.
3 is a block diagram of a defogging apparatus using an evaporator temperature and humidity sensor according to the present invention.
4 is a flowchart of a defogging method using an evaporator temperature and humidity sensor according to the present invention.
5 is a flowchart showing a cooling cycle operation timing adjustment step of the defogging method using the evaporator temperature and humidity sensor according to the present invention.
6 is a flowchart showing a cooling cycle end point adjustment step of the defogging method using the evaporator temperature and humidity sensor according to the present invention.

Hereinafter, a method of controlling the vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view showing an air conditioner equipped with an evaporator temperature and humidity sensor of a defogging apparatus using an evaporator temperature and humidity sensor according to the present invention, FIG. 3 is a block diagram of a defogging apparatus using an evaporator temperature and humidity sensor according to the present invention, 4 is a flow chart of the defogging method using the evaporator temperature and humidity sensor according to the present invention, FIG. 5 is a flowchart showing a cooling-cycle operating timing adjustment step of the defogging method using the evaporator temperature and humidity sensor according to the present invention, FIG. 2 is a flowchart illustrating a cooling cycle end timing adjustment step of a defogging method using an evaporator temperature and humidity sensor according to an embodiment of the present invention; FIG.

The present invention relates to a defogging apparatus and method using an evaporator temperature and humidity sensor, and in the following description of the embodiments of the present invention, the same or similar components as those of FIG. 1 described with reference to the background of the invention are denoted by the same reference numerals .

The present invention relates to an air conditioner comprising a blower (14) for blowing air into the air conditioning case (10), an evaporator (E) and a heater core (H) And a tempo door (15) provided between the evaporator (E) and the heater core (H) for regulating the opening of a flow path passing through the heater core (H) and a flow path for bypassing the heater core. Ging devices and methods.

The Auto Defog System (ADS) is an automatic dehumidifier that is usually equipped with an auto-detergent sensor that is spaced a certain distance from the windshield of the vehicle or front vehicle, It is a device that enables safe operation by automatically suppressing fog generation or eliminating fog generated before it occurs to ensure the driver's field of view.

The higher the humidity on the windshield of the vehicle, the higher the level of the autodeposition system.

For example, when the humidity is low, the humidity can be adjusted only by changing the ambient mode. If the humidity is higher, the windshield is operated to adjust the humidity. When the humidity is higher, the compressor driven defogging control is activated Removes inhibited or generated fog.

The vehicle defogging apparatus according to the present invention includes a control means for operating the air conditioning apparatus to perform a plurality of defogging controls according to the size of a fog generation index (FP) indicating the possibility of fog occurrence, (100) and a control unit (200). Here, the fog generation index may be detected using at least one of temperature, humidity, vehicle speed, and outside temperature. Since the phenomenon in which the fog is generated is difficult to be clearly expressed by only information of temperature, humidity, vehicle speed and outside temperature, it is possible to control the defogging by using the fog occurrence index which more accurately represents the possibility of fog using various information More precise dephogging control is possible.

The detection unit 100 detects the humidity of the air that has passed through the evaporator. At this time, the detection unit 100 can be installed anywhere in the passage through which the air passes, after the evaporator, in order to detect the humidity of the air passing through the evaporator.

In the case of an autodeposition system in which there is no detection unit 100 for detecting the humidity of the air passing through the evaporator, the autodeposition system was operated according to the humidity sensed by the humidity sensor (not shown) for depot control, (Not shown) installed in the room regardless of the humidity of the indoor air, so that when the outdoor humidity is high, the humidity inside the vehicle is increased by the change of the outside air mode or by the windshield blowing, There is a problem. Therefore, by performing the differential control according to the humidity of the air exiting the evaporator using the detection unit 100, more efficient depo control can be performed.
The control unit 200 variably sets a compressor drive defogging control operation reference value and a compressor drive defogging control end reference value in accordance with the magnitude of the humidity detected by the detector 100. When the fog occurrence index is smaller than a compressor drive defogging control operation reference value , The compressor non-drive defogging control is performed, and when the compressor operation defogging control operation reference value is exceeded, the compressor drive defogging control (A / C On) is performed. More specifically, when the humidity detected by the detecting unit 100 increases, the control unit 200 advances the compressor-driving-defogging control operation reference value when the humidity detected by the detecting unit 100 is equal to or higher than the threshold value, When the humidity detected by the detection unit 100 is lower than the threshold value, the compressor drive dephasing control operation reference value is delayed. If the humidity detected by the detection unit 100 is equal to or higher than the threshold value, And the defogging control stop reference value is advanced. In other words, when the humidity becomes higher due to the inflow of outside air, the operating time of the compressor-driven defogging control is advanced to secure the driver's watch, and when the humidity becomes lower due to the inflow of outside air, Can be improved. In addition, when the humidity becomes higher due to the inflow of outside air, the stop timing of the compressor driving defogging control is delayed to secure the driver's clock, and when the humidity becomes lower due to the inflow of outside air, the stoppage time of the compressor driving de- Can be improved.

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The compressor non-driving defogging control may include at least one of an outside-air mode switching or a de-frost (DEF) mode switching.

The defogging control can be divided into a compressor driven defogging control and a compressor non-driven defogging control. The compressor non-driven defogging control can be divided into an outside mode mode switching defogging control and a defrost mode switching defogging control.

When the compressor is driven, a large amount of energy is consumed to lower the fuel efficiency. Therefore, minimizing the compressor driven defogging control time is one of the ways to increase the fuel efficiency. Therefore, in the initial stage where the fog index is rising, it is possible to perform the defogging by blowing the outside air into the room by the outside air mode switching defogging control, and when the defogging control is difficult by only the outside air, It is possible to deform by blowing air.

4, the vehicle defogging method according to the present invention includes a detecting unit 100 and a control unit 200. The defogging method includes a plurality of defogging A method for defogging a vehicle using a vehicle defogging apparatus including a control means for operating an air conditioner to perform controls, the method comprising: operating a compressor driving dephasing control operation timing (S10), operating a compressor driving dephasing control (S20) A compressor driving defogging control end timing adjusting step (S30), and a compressor driving defogging control ending step (S40).

The defogging method suppresses fog generation and removes generated fog by means of compressor non-driven defogging control (changeover of outdoor mode or defrost (DEF) mode) and operation of compressor driven defogging control. In this case, if the operation of the compressor driving defogging control is increased in order to minimize the occurrence of fog, there is a problem that the fuel economy is increased, and if the operation of the compressor driving defogging control is minimized to raise the fuel efficiency, there is a problem that fog occurs. Therefore, it is important to set up the respective operating and ending points that can secure the driver's watch and raise fuel economy.

The compressor driving defogging control operation timing adjusting step (S10) adjusts the compressor driving defogging control operation reference value using the humidity of the air that has passed through the evaporator detected by the detector (100). The general method of defogging is to operate in accordance with the humidity sensed by a humidity sensor (not shown) installed in the room regardless of the humidity of the air leaving the evaporator, There is a problem that the fuel consumption is lowered when the operating point is set, and fog occurs when the operation timing of the compressor driving defogging control is set based on the case where the outdoor humidity is low. Therefore, by using the temperature and humidity of the air exiting the evaporator, it is possible to operate the compressor-driven dephasing control more effectively by adjusting the operating point of the compressor-driven defogging control variably according to the situation.

The compressor drive defogging control operation step S20 is operated when the fog generation index is equal to or larger than the compressor drive defogging control operation reference value adjusted in the compressor drive defogging control operation timing adjustment step S10.

The compressor driving dephasing control end timing adjustment step S30 adjusts the compressor driving deformation control termination reference value using the humidity of the air that has passed through the evaporator detected by the detection unit 100. [ As described in the operation timing adjustment step (S10), it is possible to adjust the termination reference value of the compressor drive defogging control variably according to the situation to operate the compressor drive defogging control more efficiently.

The compressor drive defogging control end step S40 ends the compressor drive defogging control when the fog generation index is equal to or lower than the compressor drive defogging control end reference value adjusted in the compressor drive defogging control end point adjustment step S30.

5, the compressor driving defogging control operation timing adjustment step S10 includes a first relative humidity detection step S12, a first threshold determination step S13, and a compressor driving dephasing control entry point adjustment step (S14).

The first relative humidity detecting step S12 detects the relative humidity of the air that has passed through the evaporator from the detecting unit 100. [

The first threshold value determination step S13 determines whether the relative humidity detected in the relative humidity detection step S12 is equal to or greater than a threshold value.

The compressor-driven defogging control entry timing adjustment step (S14) adjusts the compressor-driven defogging control operation reference value to operate at a lower fog occurrence index when the relative humidity is equal to or higher than the threshold at the first threshold value determination step (S13) When the relative humidity is below the threshold, the compressor driven defogging control operating reference value is adjusted to operate at a higher fog occurrence index.

In other words, the compressor driving defogging control operation timing adjusting step S10 may adjust the operation timing of the compressor driving defogging control according to the relative humidity of the air passing through the evaporator from the detector 100. [

6, the compressor driving defogging control end timing adjustment step S30 includes a second relative humidity detection step S32, a second threshold determination step S33, and a compressor driving dephasing control end timing adjustment step S30. (S34).

The second relative humidity detecting step S32 detects the relative humidity of the air that has passed through the evaporator from the detecting unit 100. [

The second threshold value determination step S33 determines whether the relative humidity detected in the relative humidity detection step S32 is equal to or greater than a threshold value.

The compressor driving dephasing control end timing adjustment step S34 adjusts the compressor driving dephasing control termination reference value to operate at a higher fog generation index when the relative humidity is equal to or higher than the threshold at the second threshold value determination step S33, When the relative humidity is less than the threshold value, the compressor driven regeneration control termination reference value is adjusted to operate at a lower fog occurrence index.

In other words, the compressor driving defogging control end timing adjusting step S30 may adjust the end timing of the compressor driving dephasing control according to the relative humidity of the air that has passed through the evaporator from the detector 100. [

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

10: Air conditioning case
11, 12, 13: vent 11d, 12d, 13d: door
14: Blower 15: Temp door
P1: cool air passage P2: warm air passage
E: Evaporator H: Heater core
20: Compressor 30: Expansion valve
40: condenser 50: humidity sensor for control of depog
100: Evaporator temperature / humidity sensor 200:
S10: Compressor driven dephasing control Operation timing adjustment step
S12: first relative humidity detection step S13: first threshold value determination step
S14: Compressor-driven dephasing control step
S20: Compressor-driven dephasing control operation step
S30: Compressor driven defogging control end point adjustment step
S32: second relative humidity detection step S33: second threshold value determination step
S34: Compressor-driven defogging control end timing adjustment step
S40: compressor-driven dephasing control termination step

Claims (7)

A vehicular defogging apparatus including a control means for operating an air conditioning apparatus to perform a plurality of defogging controls according to a size of a fog generation index (FP)
A detector (100) for detecting the humidity of air passing through the evaporator; And
The compressor driving regongeration control operation reference value and the compressor driving regeneration control termination reference value are variably set according to the magnitude of the humidity detected by the detector 100. When the fog generation index is less than or equal to the compressor drive defogging control operation reference value, A controller (200) which performs drive defogging control and performs compressor drive defogging control (A / C On) when the compressor operation defogging control operation reference value is exceeded;
And a defrosting device for defrosting the vehicle.
The apparatus of claim 1, wherein the controller (200)
When the humidity detected by the detecting unit 100 increases, the operating reference value of the compressor driving defogging control is advanced when the humidity detected by the detecting unit 100 is equal to or higher than the threshold value, and the operating reference value of the compressor driving defogging control is delayed when the humidity is below the threshold, When the humidity detected by the detecting unit 100 is decreased, the compressor driving-regeneration control stop reference value is delayed when the humidity detected by the detecting unit 100 is equal to or higher than the threshold value, and when the humidity is lower than the threshold value, And wherein the deformation of the deformation of the vehicle is caused by the deformation.
The compressor of claim 1, wherein the compressor non-
Wherein the at least one of the at least one of the at least one of the at least one of the at least one of the at least two of the at least one of the at least two of the at least one of the at least one of the at least one of the at least two of the plurality
The apparatus according to claim 1, wherein the fog generation index is detected using at least one of temperature of air passing through an evaporator, humidity of air passing through an evaporator, vehicle speed, and outside temperature.
And a control unit that controls the air conditioning apparatus to perform a plurality of dephasing controls according to the size of the fog generation index (FP), which includes a detection unit (100) and a control unit (200) The method comprising:
A compressor driving defogging control operation timing adjustment step (S10) for adjusting a compressor driving defogging control operation reference value by using the humidity of air that has passed through the evaporator detected by the detection unit (100);
A compressor drive defogging control operation step (S20) in which the compressor drive defogging control is activated when the fog generation index is equal to or greater than the compressor drive defogging control operation reference value adjusted in the compressor drive defogging control operation timing adjustment step (S10);
A compressor driving defogging control ending point adjusting step (S30) of adjusting a compressor driving dephasing control termination reference value using the humidity of air passing through the evaporator detected by the detecting unit (100); And
A compressor driving dephasing control ending step (S40) in which the compressor driving dephasing control is ended when the fog generation index is equal to or lower than the compressor driving dephasing control end reference value adjusted in the compressor driving dephasing control end point adjusting step (S30);
Wherein the vehicle is a vehicle.
6. The method according to claim 5, wherein the compressor driving dephasing control operation timing adjustment step (SlO)
A first relative humidity detecting step (S12) of detecting the relative humidity of air passing through the evaporator from the detecting unit (100);
A first threshold value determination step (S13) of determining whether the relative humidity detected in the relative humidity detection step (S12) is equal to or more than a threshold value; And
Adjusting the compressor drive defogging control operation reference value to operate at a lower fog occurrence index when the relative humidity is equal to or greater than the threshold at the first threshold value determination step (S13); and when the relative humidity is less than the threshold value, A compressor driven defogging control entry point adjustment step (S14) for adjusting the operation reference value to operate at a higher fog occurrence index;
Wherein the vehicle is a vehicle.
6. The method according to claim 5, wherein the compressor driving dephasing control end point adjusting step (S30)
A second relative humidity detecting step (S32) of detecting the relative humidity of the air having passed through the evaporator from the detector (100);
A second threshold value determination step (S33) of determining whether the relative humidity detected in the relative humidity detection step (S32) is equal to or more than a threshold value; And
Wherein the compressor-driven dephasing control reference value is adjusted to operate at a higher fog generation index when the relative humidity is equal to or greater than the threshold at the second threshold value determination step (S33); and when the relative humidity is less than the threshold value, A compressor driven defogging control end point adjustment step (S34) for adjusting the end reference value to operate at a lower fog generation index;
Wherein the vehicle is a vehicle.

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