Method and system for controlling heating of glass

Abstract

The invention relates to a method and a system for controlling heating of glass. An embodiment of a method of controlling a heated glass includes setting a specified temperature of the heated glass according to temperature and humidity conditions measured by a sensor, calculating an applied power to reach the specified temperature based on an integrated thermal resistance formed in the heated glass, a phase shift of two or more phases of AC power is performed to provide the calculated applied power to a load that heats the glass, and correction power is calculated in consideration of the resolution of the sensor, in which the corresponding operation is controlled according to a set control period.

Description

Technical Field

[0001] The present disclosure relates to systems and methods for controlling heated glass. Background Art

[0002] The vehicle includes heated glass located at the front and rear of the vehicle, and performs a function of raising the surface temperature of the heated glass by applying power to a load located in the heated glass to prevent condensation inside and outside the heated glass to ensure the driver's field of vision.

[0003] That is, it is important to control the temperature of a load located in a heated glass of a vehicle to prevent condensation from occurring in a saturated water vapor state by increasing the temperature of the heated surface glass in response to a relative humidity chart.

[0004] However, there is a problem of consuming a large amount of power to apply power to the load of the heated glass to maintain a constant temperature. In addition, conventionally, efforts have been made to provide a constant duty cycle to control the heating temperature of a large number of heated glasses with various sizes and loads.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the embodiments of the present disclosure and therefore it may contain information that does not form known prior art.

[0006] Korean Patent Application No. 10-2008-0098779 may provide additional information related to the technology discussed herein. Summary of the invention

[0007] The present disclosure relates to systems and methods for controlling heated glass. More particularly, the present disclosure relates to systems and methods for controlling heated glass to provide optimal applied power to the heated glass based on a temperature model transfer function, wherein integrated thermal resistance is set as a factor.

[0008] Embodiments of the present disclosure may solve problems associated with the prior art, and embodiments of the present disclosure set optimal applied power applied to a heated glass through a heated glass control method.

[0009] Another embodiment of the present disclosure provides a method of controlling heated glass, wherein when applied power in a corresponding control cycle is calculated by reflecting temperature and humidity measured by a sensor (ie, sensor) according to the control cycle, power is calculated by reflecting a driving environment of a vehicle.

[0010] Yet another embodiment of the present disclosure provides a method for controlling heated glass, wherein, in order to solve the problem that the applied power calculated based on a low-resolution sensor is set to 100% or 0%, a heat dissipation slope based on a temperature drop value is calculated, and the applied power is corrected based on the heat dissipation slope.

[0011] The embodiments of the present disclosure are not limited to the above-mentioned embodiments, and other embodiments of the present disclosure not mentioned can be understood by the following description and can be more clearly understood by the exemplary embodiments of the present disclosure. In addition, the embodiments of the present disclosure can be implemented by the means indicated in the claims and their combinations.

[0012] In order to achieve the above-mentioned features of an embodiment of the present disclosure, a method of controlling heating glass includes the following configuration.

[0013] One embodiment of the present disclosure provides a method for controlling heated glass, comprising: a controller setting a specified temperature of the heated glass based on temperature and humidity conditions measured by a sensor; the controller calculating an applied power to reach the specified temperature based on an integrated thermal resistance formed in the heated glass; the controller performing a phase shift of two or more phases of AC power to provide the calculated applied power to a load of the heated glass; and the controller calculating a correction power taking into account a resolution of the sensor, wherein the controller is configured to control corresponding operations based on a set control cycle.

[0014] In a preferred embodiment, setting the specified temperature of the heated glass by the controller based on the temperature and humidity conditions measured by the sensor may include: receiving the vehicle's external temperature and humidity conditions and the vehicle's internal temperature and humidity conditions through an external sensor located outside the heated glass and an internal sensor located inside the heated glass, and setting the specified temperature by the controller based on the received vehicle's external temperature and humidity conditions and the received vehicle's internal temperature and humidity conditions.

[0015] In another preferred embodiment, the method may also include: the controller calculating the integrated thermal resistance outside the vehicle and the integrated thermal resistance inside the vehicle through the temperature and humidity conditions outside the vehicle and the temperature and humidity conditions inside the vehicle; the controller calculating the applied power outside the vehicle based on the calculated integrated thermal resistance outside the vehicle and calculating the applied power inside the vehicle based on the calculated integrated thermal resistance inside the vehicle; and providing a relatively large applied power by comparing the calculated applied power outside the vehicle and the calculated applied power inside the vehicle with each other.

[0016] In another preferred embodiment, the applied power in the current control cycle can be calculated by the following Equation 1.

[0017] Equation 1:

[0018]

[0019] (P[K]: Power applied in the Kth control cycle, : Integrated thermal resistance, : The temperature of the heated glass, : Specified temperature, K: number of control cycles. )

[0020] In yet another preferred embodiment, the integrated thermal resistance may be the sum of the radiation thermal resistance and the convection thermal resistance of the heating glass.

[0021] In yet another preferred embodiment, the integrated thermal resistance may be calculated taking into account the heat loss of the heated glass.

[0022] In another preferred embodiment, when the designated temperature of the heated glass is set by the controller according to the temperature and humidity conditions measured by the sensor, the controller may set the designated temperature to a temperature with a relative humidity of 80% to 90% based on a humidity table.

[0023] In another preferred embodiment, when the specified temperature of the heated glass is set by the controller based on the temperature and humidity conditions measured by the sensor, the temperature of the heated glass in the current control cycle can be calculated by the above equation 1 based on the integrated thermal resistance and the temperature of the heated glass in the previous control cycle.

[0024] In another preferred embodiment, calculating the correction power by the controller while taking into account the resolution of the sensor may include, if the resolution of the sensor is less than or equal to a set value, calculating, by the controller, a heat dissipation slope based on the temperature drop after reaching a specified temperature of the heated glass, setting the correction power based on the calculated heat dissipation slope by the controller, and performing, by the controller, phase shifting of two or more phases of AC power to provide the correction power to the load of the heated glass.

[0025] In yet another preferred embodiment, if the power applied to the heated glass after the temperature of the heated glass converges to a specified temperature has a power value of 0% or 100% of the power supplied from the power supply, it can be determined that the resolution of the sensor is less than or equal to the set value.

[0026] In still another preferred embodiment, if the resolution of the sensor is less than or equal to the set value, the correction power may be set after the applied power calculated in the control cycle is applied to the heating glass.

[0027] In yet another preferred embodiment, the heat dissipation slope may be calculated by the following Equation 2.

[0028] Equation 2:

[0029]

[0030] ( : The temperature of the heated glass before the temperature drops after reaching the specified temperature, : The temperature of the heated glass after the temperature drop, : The time it takes for the temperature to drop from the specified temperature, K: The number of control cycles)

[0031] In yet another preferred embodiment, the correction power can be calculated by the following equation 3:

[0032]

[0033] ( : Correction power, : heat dissipation slope, : Control cycle time, K: Control cycle number, : Rated power. )

[0034] In yet another preferred embodiment, when calculating the heat dissipation slope according to the temperature drop after reaching a designated temperature of the heated glass, the heat dissipation slope may be calculated based on the time when the applied power is 0 W.

[0035] In still another preferred embodiment, the heat dissipation slope may be calculated based on the time taken for the temperature of the heated glass to decrease from a designated temperature by a temperature corresponding to a minimum unit of resolution of the sensor.

[0036] Other aspects and preferred embodiments of the disclosure are discussed below.

[0037] The above and other features of embodiments of the present disclosure are discussed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other features of embodiments of the present disclosure will now be described in detail with reference to some exemplary embodiments thereof shown in the accompanying drawings, which are given hereinafter by way of illustration only and therefore do not limit the present disclosure, and in which:

[0039] Figure 1 is a block diagram showing a configuration of a system for controlling heated glass according to one embodiment of the present disclosure;

[0040] Figure 2 is a diagram showing a configuration of an integrated thermal resistor of a system according to one embodiment of the present disclosure;

[0041] Figure 3 is a flow chart showing a method of controlling heated glass according to one embodiment of the present disclosure;

[0042] Figure 4 is a flowchart showing a method of controlling a heated glass including an in-vehicle sensor and an out-vehicle sensor according to another embodiment of the present disclosure;

[0043] 5A and 5B are graphs showing the temperature and applied power of heated glass in a method according to one embodiment of the present disclosure;

[0044] Figure 6is a flow chart showing calculation of correction power in a method according to one embodiment of the present disclosure;

[0045] Figure 7 is a diagram showing temperature variation of heated glass according to a control cycle according to one embodiment of the present disclosure;

[0046] 8A and 8B are graphs showing changes in power applied to the heating glass according to a control cycle; and

[0047] Fig. 9 is an equivalent circuit forming the heated glass according to one embodiment of the present disclosure.

[0048] It should be understood that the drawings are not necessarily drawn to scale, and that they present somewhat simplified representations of various preferred features illustrating the basic principles of embodiments of the present disclosure. The specific design features of the embodiments of the present disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the specific intended application and use environment.

[0049] In the drawings, reference numbers refer to the same or equivalent parts of the present disclosure throughout the several figures of the drawing. DETAILED DESCRIPTION

[0050] Hereinafter, various embodiments of the present disclosure will be referred to in detail, examples of which are shown in the accompanying drawings and described below. The present disclosure is not limited to the following embodiments, and the embodiments may be implemented in various different forms. These embodiments are provided to make the description of the present disclosure thorough and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] In addition, in the description of the following embodiments, it will be understood that suffixes "...part", "...unit", "...module" etc. represent units for processing at least one function or operation, and can be implemented as software, hardware, or a combination of software and hardware.

[0052] Furthermore, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, a singular expression may also be intended to include a plural expression.

[0053] Furthermore, in the following description of the embodiments of the present disclosure, terms such as “first” and “second” are used only to distinguish one element from other elements, and the order thereof is not necessarily limited in the following description.

[0054] In addition, in the following description of the embodiments of the present disclosure, applied power refers to power applied to the glass and refers to power less than or equal to the set rated power. The applied power applied to the following glass may refer to the applied power calculated by the controller, and may also be understood as a concept including power not exceeding the rated power.

[0055] In addition, in the following description of the embodiments of the present disclosure, the controller 40 may be implemented by storing data about an algorithm configured to control the operation of various elements provided in the vehicle, or a memory configured to reproduce the program of the algorithm, and a processor that performs the above-mentioned operations using the data stored in the memory. Here, the memory and the processor may be implemented as separate chips. Otherwise, the memory and the processor may be implemented as a single chip. For example, the controller 40 may include at least one of an electronic control unit (ECU), a central processing unit (CPU), a microprocessor unit (MPU), a microcontroller unit (MCU), an application processor (AP), or any processor that is well known to those skilled in the art of the present disclosure. In addition, the controller 40 may be implemented as a combination of software and hardware, which may perform calculations in at least one application or program configured to perform a method according to an embodiment of the present disclosure.

[0056] The heated glass of an embodiment of the present disclosure is a concept including not only the heated glass but also the electrochromic glass, the heated glass includes a load used as a heat source, and the embodiment of the present disclosure relates to a method and system for calculating applied power applied to the load if the object is the heated glass and calculating applied power to control the amount of color change if the object is electrochromic glass.

[0057] Hereinafter, the heating glass will be described as an example, but the heating glass may be replaced by electrochromic glass.

[0058] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, even if the same or corresponding components are depicted in different drawings, they will be denoted by the same reference numerals and detailed description of their redundant contents will be omitted.

[0059] The present disclosure relates to a system and method for controlling a heated glass 10 located in a vehicle, which calculates power applied to the heated glass 10 and provides the calculated applied power of the heated glass 10 through phase shifting of two or more phases of AC power.

[0060] Figure 1 and Figure 2 A configuration of a system for controlling heating of the glass 10 according to one embodiment of the present disclosure is shown.

[0061] The heated glass 10 refers to glass located on the front surface, rear surface or side surface of the vehicle, and heat is provided to the heated glass 10 by a load located in the heated glass 10. In addition, the load is configured to be conductively connected to a power source 30 located in the vehicle, and the power source 30 is controlled by a controller 40 to apply power to the load.

[0062] In addition, the power supply 30 may be configured to provide two or more phases of AC power, and may provide the applied power set by the controller 40 to the load through the two or more phases of AC power. The power supply 30 may be supplied with power through a battery located in the vehicle and may convert the DC power into AC power using an AC-DC converter to provide the applied power to the heated glass 10.

[0063] The sensor 20 may measure the temperature and humidity outside the heated glass 10 or inside the vehicle based on the heated glass 10. In one embodiment of the present disclosure, the sensor 20 may include an outside air temperature sensor, an interior sensor, and / or an automatic defog sensor.

[0064] The outside air temperature sensor is located outside the vehicle and is configured to measure the outside air temperature while the vehicle is traveling. In addition, there are two types of outside air temperature sensors, one is an ambient (AMB) sensor dedicated to temperature measurement, and the other is an air quality sensor (AQS), which is an air quality measurement device that measures temperature and automatically switches between inside air and outside air in the air conditioner.

[0065] Furthermore, in one embodiment of the present disclosure, the on-board sensor is a sensor that senses the temperature of the interior air inside the vehicle, and the automatic temperature control device may measure the interior temperature of the vehicle using the temperature sensed by the on-board sensor.

[0066] The automatic defog sensor may predict and / or detect fogging that has begun to form on the surface of the heated glass 10 and, in a vehicle, may be employed on the interior surface of the heated glass 10 of the vehicle.

[0067] The automatic defog sensor may include a temperature sensor and a relative humidity sensor for measuring the temperature of the inner surface of the heated glass 10. In addition, in order to calculate a relatively accurate dew point temperature, the relative humidity sensor and the onboard sensor of the vehicle are adjacent to each other to measure humidity and temperature at the same point.

[0068] In addition, the temperature sensor in the automatic deformation sensor is positioned to contact the surface of the heated glass 10, or is configured to have a specified gap with the surface of the heated glass 10. Therefore, the automatic defog sensor can measure the current temperature of the heated glass 10 and send the measured current temperature to the controller 40.

[0069] In addition, as the sensor 20 according to the embodiment of the present disclosure, the exterior sensor 21 may include an exterior air temperature sensor, and the interior sensor 22 may include an automatic defog sensor or an onboard sensor.

[0070] The controller 40 receives current measured values ​​of the outside air temperature and the inside temperature of the vehicle and the temperature of the heated glass 10 through the outside air temperature sensor, the vehicle-mounted sensor, and the automatic defog sensor as the sensor 20. In addition, the controller 40 may calculate the current heat capacity of the heated glass 10, the heat exchange capacity between the heated glass 10 and the outside of the vehicle, and the heat exchange capacity between the heated glass 10 and the inside of the vehicle, taking into account each received temperature condition.

[0071] In addition, the controller 40 may measure the temperature of the heated glass 10 of the vehicle through the outside air temperature sensor in the first control cycle. That is, it may be determined that the outside air temperature and the temperature of the heated glass 10 are the same in a thermal equilibrium state, and based on this, the temperature of the heated glass 10 in the first control cycle may be set based on the outside air temperature.

[0072] In addition, in the control cycle continuously executed after the first control cycle, the current temperature of the heated glass 10 may be calculated as the sum of the initial outside air temperature and the product of the integrated thermal resistance and the applied power. That is, when calculating the temperature of the heated glass 10, the controller 40 may calculate the temperature of the heated glass 10 in the current control cycle through the relationship with the outside air temperature based on the integrated thermal resistance and the applied power calculated in the previous cycle. In addition, the controller 40 is configured to calculate the applied power in the current control cycle based on the integrated thermal resistance and the applied power calculated in the previous cycle and the specified temperature in the current control cycle.

[0073] Therefore, the controller 40 may calculate the integrated thermal resistance in the first control cycle, and in subsequent control cycles, it may calculate the current temperature of the heating glass 10 in the current control cycle and the applied power in the current control cycle based on the integrated thermal resistance calculated in the previous cycle.

[0074] Alternatively, in another embodiment of the present disclosure, since the sensor 20 can measure the temperature of the heated glass 10 in the current control cycle and can send the measured temperature of the heated glass 10 to the controller 40, the controller 40 can calculate the applied power in the current control cycle based on the integrated thermal resistance in the previous control cycle.

[0075] The controller 40 is controlled to apply the applied power to the heated glass 10 according to the set control cycle, and, if the applied power is set, the controller 40 is configured to perform phase shift of two or more phases of AC power based on the set applied power to apply power to the heated glass 10 .

[0076] In addition, the controller 40 is configured to receive temperature and humidity information through the sensor 20 and calculate a specified temperature based on a hygrometer pre-stored in the controller 40. The specified temperature is calculated by comparing with a saturated water vapor pressure curve of the hygrometer stored in the controller 40, and the specified temperature may be set so that the relative humidity becomes 80% to 90%.

[0077] The designated temperature is set so that the relative humidity is less than 100%, and the controller 40 calculates the integrated thermal resistance of the heating glass 10 according to the designated temperature.

[0078] The integrated thermal resistance of the heating glass 10 is calculated by summing the radiation thermal resistance and the convection thermal resistance of the heating glass 10 , and is calculated using the following Equations 4 and 5.

[0079] Radiant heat resistance.

[0080] Equation 4:

[0081]

[0082] (a: Staffan-Boltzmann constant, : Surface temperature of heated glass, : Atmospheric temperature. )

[0083] Convective heat resistance.

[0084] Equation 5:

[0085]

[0086] (h: convection heat transfer coefficient [W / m2K], A: area of ​​heated glass)

[0087] That is, the embodiment of the present disclosure is configured to calculate the applied power by calculating the integrated thermal resistance through equivalent circuit conversion of the heated glass 10 and calculating the thermal resistance and the thermal capacity depending on the driving environment that varies with each control cycle.

[0088] In addition, an RC parallel equivalent circuit can be set by the thermal resistance and thermal capacitance of the heating glass 10 calculated in this manner, and therefore, the temperature model transfer function of the heating glass 10 can be calculated as follows.

[0089] Furthermore, the integrated thermal resistance may be calculated in consideration of the heat loss of the heating glass 10 , and the heat loss of the heating glass 10 may be stored in or calculated by the controller 40 based on the temperature of the heating glass 10 and the atmospheric temperature.

[0090] The equivalent circuit of the heated glass 10 is formed as follows Fig. 9 shown.

[0091] The temperature model transfer function according to the equivalent circuit can be set as the following Equation 6.

[0092] Equation 6:

[0093]

[0094] here, Represents the transfer function calculated for each control cycle based on the integrated thermal resistance and thermal capacitance.

[0095] Therefore, the thermal model transfer function of the heating glass 10 may be set based on the heat capacity of the heating glass 10 and the calculated integrated thermal resistance, and the controller 40 may calculate the applied power based on the set transfer function.

[0096] If the applied power is calculated, the controller 40 may control the power supply 30 that provides two or more phases of AC power. In one embodiment of the present disclosure, the power supply 30 is configured to apply a three-phase AC voltage to the heated glass 10, and therefore, the controller 40 performs phase shifting of the three-phase AC voltage and applies AC power corresponding to the applied power to the heated glass 10.

[0097] Furthermore, the controller 40 may be configured to calculate respective integrated thermal resistances according to the exterior sensor 21 and the interior sensor 22 , calculate applied powers according to the respective integrated thermal resistances, and perform phase shifting of the power source 30 in response to a larger one of the calculated applied powers.

[0098] This is used to set the application of power to prevent condensation and frost on the exterior of the heated glass 10, thereby improving the driver's field of vision.

[0099] Figure 3 is a flow chart illustrating a method of controlling a heated glass 10 using one sensor 20 according to one embodiment of the present disclosure.

[0100] As shown in the figure, the controller 40 receives the driving condition information of the vehicle measured by the sensor 20. The driving condition information of the vehicle includes the outside temperature and humidity information of the vehicle. In addition, the temperature of the heating glass 10 is determined to be the same as the outside air temperature in the initial thermal equilibrium state.

[0101] The controller 40 sets a designated temperature at which the relative humidity is 80% to 90% according to a humidity table stored in the controller 40 based on the temperature and humidity information received from the sensor 20 ( S100 ).

[0102] In addition, the controller 40 calculates the integrated thermal resistance of the heating glass 10, and in this case, the integrated thermal resistance is calculated by summing the radiation resistance and the convection resistance of the heating glass 10 (S110). Thereafter, the controller 40 may calculate the application power to increase the temperature of the heating glass 10 to a designated temperature according to the calculated integrated thermal resistance (S120).

[0103] Here, the controller 40 calculates the radiation thermal resistance using the above Equation 4 and calculates the convection thermal resistance using the above Equation 5 to calculate the integrated thermal resistance.

[0104] After calculating the applied power, the controller 40 calculates a phase shift of the power source 30 including AC power of two or more phases ( S130 ), and applies the phase-shifted power to the heating glass 10 ( S140 ).

[0105] In this way, the controller 40 according to the embodiment of the present disclosure performs the corresponding operation of the method of controlling the heated glass 10 in one control cycle, and then continuously performs the corresponding operation in the next control cycle. Here, because the temperature of the heated glass 10 in the first control cycle is different from the temperature of the heated glass 10 in the thermal equilibrium state, the controller 40 calculates the temperature of the heated glass 10 in the current control cycle based on the power applied in the previous control cycle (S110).

[0106] In addition, the controller 40 calculates the applied power in the current control cycle based on the integrated thermal resistance calculated in the previous control cycle. That is, in the continuous control cycle, the current temperature of the heating glass 10 in the current control cycle and the applied power in the current control cycle can be calculated based on the factors in the previous control cycle.

[0107] In one embodiment of the present disclosure, the temperature and applied power of the heating glass 10 in the current control cycle may be calculated according to Equation 1.

[0108] Equation 1:

[0109]

[0110] (P[K]: Power applied in the Kth control cycle, : Integrated thermal resistance, : The temperature of the heated glass, : Specified temperature, K: number of control cycles. )

[0111] That is, the temperature of the heated glass 10 in the current control cycle can be calculated by the sum of the temperature of the heated glass 10 in the previous control cycle and the product of the integrated thermal resistance in the previous control cycle and the applied power in the previous control cycle, and the applied power in the current control cycle can be determined by comparing the difference between the specified temperature and the temperature of the heated glass 10 in the current control cycle with the integrated thermal resistance in the previous control cycle.

[0112] In one embodiment of the present disclosure, the controller 40 may receive the temperature of the heated glass 10 in the current control cycle through the sensor 20, and in another embodiment of the present disclosure, the controller 40 may calculate the temperature of the heated glass 10 in the current control cycle as the sum of the temperature of the heated glass 10 in the previous control cycle and the product of the integrated thermal resistance in the previous control cycle and the applied power in the previous control cycle.

[0113] This is a configuration for linearizing the temperature of the heating glass 10 having nonlinear thermal characteristics according to the control cycle by applying an integrated thermal resistance to calculate the applied power in the current control cycle in response to the previous control cycle. Therefore, in order to perform accurate calculation of the temperature of the heating glass 10 modeled as a thermal circuit, the process of calculating all nonlinear equations (such as for radiation thermal resistance and convection thermal resistance) to calculate the thermal resistance of the thermal model can be simplified. In addition, in order to easily calculate the nonlinear equation by linearization, the applied power in the current control cycle can be calculated by linearizing the nonlinear equation by calculating the integrated thermal resistance using the applied power and the changed temperature of the heating glass 10 in each control cycle (S110).

[0114] In this way, the controller 40 can calculate the temperature and applied power of the heated glass 10 in the current control cycle based on factors in the previous control cycle (according to the control cycle that is carried out successively).

[0115] Furthermore, after calculating the temperature of the heating glass 10 and the applied power in each control cycle, the controller 40 calculates the correction power in consideration of the resolution of the sensor 20 (S150). Figure 6 As shown, if the resolution of the sensor 20 is less than or equal to the set value (S610), the controller 40 calculates the heat dissipation slope according to the temperature drop after reaching the designated temperature (S620). Here, when determining whether the resolution of the sensor 20 is less than or equal to the set value, a state in which the temperature of the heating glass 10 converges to the designated temperature is included as a condition, and in a section in which the heating glass 10 maintains the designated temperature after the heating glass 10 converges to the designated temperature, it is determined that the resolution of the sensor 20 is less than or equal to the set value under the condition that the applied power from the power supply 30 is calculated to be 0% or 100%.

[0116] Here, the resolution refers to the minimum unit of the temperature calculated by the sensor 20, and if the sensor 20 with low resolution is applied, the applied power calculated in the section where the heated glass 10 maintains the specified temperature may not be gradually applied to the heated glass 10, and 0% or 100% of the power supplied from the power supply 30 may be provided to the heated glass 10. Therefore, in order to provide the heated glass 10 including the sensor 20 with low resolution with appropriate applied power, the applied power is corrected based on the heat dissipation slope (S630). Therefore, the controller 40 calculates the corrected power and provides the phase-shifted corrected power to the heated glass 10 by phase shifting of the AC power of two or more phases (S640).

[0117] On the other hand, if the resolution of the sensor 20 is greater than the set value, the controller 40 performs the next control cycle ( S650 ).

[0118] As described above, the applied power to the heated glass 10 can be optimized according to the resolution of the sensor 20, and will be described below. Figure 6 A method for calculating the correction power is described in .

[0119] Figure 4 1 is a flowchart showing a method of controlling the heated glass 10 in a case where the heated glass 10 includes the exterior sensor 21 and the interior sensor 22 as another embodiment of the present disclosure.

[0120] The controller 40 receives the interior and exterior temperatures and the interior and exterior humidity of the heated glass 10 detected by the exterior sensor 21 and the interior sensor 22 (S200 and S300), and sets a designated temperature corresponding to the received temperature and humidity through a hygrometer stored in the controller 40. and The controller 40 sets the specified temperature based on the and (S320) Calculate the integrated thermal resistance R between the heating glass 10 and the air in the vehicle (S220) th1 and the integrated thermal resistance R between the heated glass 10 and the outside air or atmosphere th2 .

[0121] The controller 40 calculates the thermal resistance R th1 and R th2 Calculate the applied power P accordingly 1 and P 2 (S230 and S330), and the controller 40 sets the applied power P 1 and P 2 A relatively large applied power is applied to the heating glass 10 (S400).

[0122] Thereafter, the controller 40 performs a relatively large phase shift of the applied power ( S410 ) and applies the power from the power source 30 to the heating glass ( S420 ).

[0123] Here, the controller 40 may simultaneously and independently perform calculation of the applied power P based on the information received from the in-vehicle sensor 22. 1 The corresponding operations (S200 to S230) and the calculation of the applied power P based on the information received from the off-vehicle sensor 21 2 The corresponding operations (S300 to S330) of FIG. 4 and the controller 40 may then perform a comparison of the calculated applied power P 1 and P 2 operation (S400).

[0124] Therefore, the control method according to an embodiment of the present disclosure sets the temperature model transfer function by determining the thermal resistance and thermal capacitance based on the temperature and humidity conditions received by the corresponding sensors 21 and 22 according to the control cycle, and in an embodiment of the present disclosure, by calculating the specified temperature of the heated glass 10 and the applied power, stable power is applied to the heated glass 10 by reflecting the driving environment that changes according to the control cycle.

[0125] 5A and 5B are graphs showing applied power per control cycle and resulting temperature states of the heating glass 10 in one embodiment according to the present disclosure.

[0126] The controller 40 sets a designated temperature to defrost and prevent condensation of the heated glass 10 by the temperature and humidity conditions measured by the sensor 20, and in this case, the controller 40 sets the designated temperature to a temperature at which the relative humidity becomes 80% to 90% based on a hygrometer stored in the controller 40.

[0127] The controller 40 calculates the temperature model transfer function based on the set designated temperature (target temperature), and determines the temperature model transfer function based on the heat capacity and integrated thermal resistance of the heated glass 10. In addition, the controller 40 performs phase shift of the AC voltage of two or more phases based on the applied power applied to the heated glass 10 calculated by the temperature model transfer function. Therefore, the controller 40 is configured to apply AC power to the heated glass 10 by phase shift.

[0128] In addition, as shown in the drawings, the specified temperature and applied power are determined based on each integrated thermal resistance and thermal capacitance according to the control cycle. The controller 40 can calculate the temperature of the heating glass 10 in the current control cycle based on the integrated thermal resistance in the previous cycle and the applied power in the previous cycle, and the controller 40 can calculate the applied power in the current control cycle based on the calculated temperature of the heating glass 10 in the current cycle and the integrated thermal resistance calculated in the previous control cycle.

[0129] Therefore, the controller 40 is configured to determine the temperature of the heated glass 10 in the current control cycle based on the integrated thermal resistance and the applied power in the previous control cycle, and to set the applied power in the current control cycle based on the temperature of the heated glass 10 in the current control cycle. In addition, the controller 40 is configured to set the specified temperature based on the temperature of the heated glass 10 in the current control cycle according to the temperature and humidity information measured by the sensor 20 in the current control cycle.

[0130] As shown in the figure, the temperature of the heated glass 10 is controlled to converge to a designated temperature, and the applied power applied to the heated glass 10 is controlled so that the heated glass 10 maintains the designated temperature after the heated glass 10 converges to the designated temperature.

[0131] Figure 6 is a flowchart showing calculation of correction power in consideration of the resolution of a sensor according to one embodiment of the present disclosure.

[0132] like Figure 6 As shown, if the resolution of the sensor 20 is greater than the set value in a state where the temperature of the heating glass 10 converges to the designated temperature (No in S610 ), the controller 40 performs the next control cycle ( S650 ).

[0133] On the contrary, if the resolution of the sensor 20 is less than or equal to the set value (Yes in S610), the heat dissipation slope according to the temperature drop after reaching the specified temperature is calculated (S620). Here, the set value can be set to include a minimum temperature unit of 0.5 degrees. In addition, when the controller 40 determines whether the resolution of the sensor 20 is less than or equal to the set value, in the section where the temperature of the heated glass 10 maintains the specified temperature after having converged to the specified temperature, the applied power calculated by the controller 40 refers to the condition of calculating 0% or 100% of the power that can be provided to the heated glass 10 from the power supply 30. That is, it can be determined whether the resolution of the sensor 20 is less than or equal to the set value under the condition of calculating only 0% of the power from the power supply 30 or 100% of the maximum power as the applied power.

[0134] Therefore, the controller 40 is configured to supply the calculated applied power to the heating glass 10 , and then calculate the correction power in a control period in which the resolution of the sensor 20 is determined to be less than or equal to the set value.

[0135] In order to calculate the correction power, the controller 40 calculates the heat dissipation slope in advance. The heat dissipation slope is based on the time t d Calculated at this time t dWhen the temperature of the heating glass 10 is reduced from the designated temperature by the minimum unit of resolution after having converged to the designated temperature. That is, the slope of reducing the temperature by the minimum unit of resolution after the measured temperature of the heating glass 10 reaches the designated temperature according to the control cycle is determined as the heat dissipation slope, and the heat dissipation slope is calculated based on the time during the control cycle in which the applied power is 0 W calculated by the controller 40 (S620). In addition, the heat dissipation slope may be calculated by setting the time t before the time point when the temperature of the heating glass 10 converges to the designated temperature and the resolution is determined to be less than or equal to the set value. d To calculate the heat dissipation slope.

[0136] That is, the heat dissipation slope is calculated based on the temperature drop value determined based on the time of receiving the temperature drop in the minimum unit of the resolution of the sensor 20 , as shown in Equation 2.

[0137] Equation 2:

[0138]

[0139] ( : The temperature of the heated glass before the temperature drop after reaching the specified temperature, : The temperature of the heated glass after the temperature drop, : The time it takes for the temperature to drop from the specified temperature, K: The number of control cycles)

[0140] Furthermore, since the correction power including the correction value of the applied power can be calculated based on the heat dissipation slope, the correction power is calculated as shown in Equation 3 (S630).

[0141] Equation 3:

[0142]

[0143] ( : Correction power, : heat dissipation slope, : Control cycle time, K: Control cycle number, : Rated power. )

[0144] Here, the rated power means the power at which the heating glass 10 does not cause problems (breakage, etc.), and if the applied power exceeding the rated power is calculated, the rated power is supplied to the heating glass 10. On the contrary, if the applied power less than or equal to the rated power is calculated, the calculated applied power is supplied to the heating glass 10.

[0145] The correction power calculated in this manner is applied to the heating glass 10 through phase shift ( S640 ).

[0146] like Figure 78A and 8B , the controller 40 calculates the applied power so that the temperature of the heated glass 10 increases, performs a phase shift of the calculated applied power, and then supplies the applied power to the heated glass 10. Thereafter, if the temperature of the heated glass 10 measured by the sensor 20 converges to a specified temperature, the applied power is controlled to 0 W.

[0147] However, if the resolution of the sensor 20 is less than or equal to the set value and the temperature drop value of the heated glass 10 is measured by the sensor 20, the controller 40 calculates the heat dissipation slope based on the time for which the designated temperature is maintained (the time before the temperature drop value of the heated glass 10 is measured). Here, whether the resolution of the sensor 20 is less than or equal to the set value is determined under the following conditions: in the section where the temperature of the heated glass 10 is maintained at the designated temperature, the applied power calculated in the corresponding control cycle is calculated as 0% or 100% of the maximum power from the power supply 30.

[0148] If the resolution of the sensor 20 is less than or equal to the set value, the correction power is calculated based on the calculated heat dissipation slope, and thus, as shown in FIGS. 8A and 8B , the correction power calculated by the controller 40 is applied to the heating glass 10 .

[0149] Area A in Figure 8B indicates the time when the temperature of the heated glass 10 converges to the specified temperature, and if the applied power is output as a power value of 0% or 100% of the power provided from the power supply 30 in response to the subsequent temperature drop of the heated glass 10, the resolution of the sensor 20 is determined to be less than or equal to the set value.

[0150] Furthermore, if the resolution of the sensor 20 is determined to be less than or equal to the set value, that is, if the applied power is calculated as a power value of 0% or 100% of the power supplied from the power source 30 in the section where the heated glass 10 maintains the specified temperature, the controller 40 calculates the time from the time point when the temperature of the heated glass 10 converges to the specified temperature to the time point when the temperature of the heated glass 10 first decreases. Here, time represents the time of area A. Further, the controller 40 is configured to Calculate the heat dissipation slope. More preferably, time The time when the applied power is 0 W calculated by the controller 40 or the time when the temperature of the heated glass 10 decreases from the designated temperature in the minimum unit of the resolution of the sensor 20 may be indicated.

[0151] Furthermore, the controller 40 is configured to calculate the correction power according to the heat dissipation slope. According to the control cycle, the correction power can be calculated for time and the calculated applied power.

[0152] In addition, if a temperature change of the heated glass 10 occurs in a section (such as region B and region C) to which the correction power is applied, it can be determined that a disturbance other than the control factor occurs in the heated glass 10. If a change occurs due to the disturbance after the correction power is applied, the controller 40 calculates the applied power by determining the first thermal resistance and applies the applied power to the heated glass 10. Therefore, in region B, it is determined that a disturbance of temperature decrease occurs, and power calculated as 100% of the applied power is applied to the heated glass 10. On the contrary, in region C, it is determined that a disturbance of temperature increase occurs, and the applied power is calculated as 0W.

[0153] Therefore, in the embodiment of the present disclosure, if the power applied to the heated glass 10 is calculated to be 0% or 100% of the power supplied from the power source 30 in the section where the temperature of the heated glass 10 converges to the designated temperature, the sensor 20 is determined to have a low resolution and the correction power is applied to the heated glass 10. In addition, the controller 40 calculates a heat dissipation slope based on a time point at which the temperature of the heated glass 10 decreases from the designated temperature to which the temperature of the heated glass 10 converges, and applies the correction power to the heated glass 10 based on the calculated heat dissipation slope.

[0154] In addition, if a temperature change of the heated glass 10 occurs during a control period in which the correction power is applied, the controller 40 determines that the temperature change is caused by disturbance, calculates the applied power, and provides the calculated applied power. That is, the controller 40 calculates the applied power based on the thermal resistance in response to the disturbance condition, and applies the power to the heated glass 10, and therefore, a stable method of controlling the glass can be provided.

[0155] As is apparent from the above description, the embodiments of the present disclosure can obtain the following effects through the above-mentioned configurations, combinations, and usage relationships disclosed in the embodiments.

[0156] An embodiment of the present disclosure provides a system for controlling heated glass, which can calculate applied power, in which a real-time driving environment of a vehicle is reflected, and thus can have the effect of calculating accurate applied power in a corresponding control cycle.

[0157] In addition, the embodiment of the present disclosure calculates the thermal resistance according to the control period, and thus may have the effect of providing applied power with a fixed duty ratio to the heating glass.

[0158] Furthermore, the embodiment of the present disclosure calculates applied power by equating electrical parameters to a temperature model transfer function, and thus may have an effect of providing a simple control algorithm.

[0159] Furthermore, the embodiment of the present disclosure can correct the applied power and, if a low-resolution sensor is applied, apply the corrected power to the heated glass, thereby providing an efficient driving environment that supplies less power than the resolution of the sensor.

[0160] The present disclosure as described above is not limited to the embodiments and drawings described herein. It should be clear to those skilled in the art that various substitutions, changes and modifications that are not illustrated here but are still within the spirit and scope of the present disclosure may be made. Therefore, the scope of the present disclosure is not limited by the detailed description, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents should be interpreted as included in the present disclosure.

Claims

1. A method for controlling heated glass, the method comprising: Setting a specified temperature of the heated glass according to temperature and humidity conditions measured by a sensor; calculating the applied power to reach the specified temperature based on the integrated thermal resistance formed in the heated glass; performing phase shifting of two or more phases of alternating current (AC) power to provide the calculated applied power to the glass heating load; and The correction power is calculated in consideration of the resolution of the sensor, wherein the corresponding operation is controlled in accordance with the set control cycle.

2. The method according to claim 1, wherein: Setting the specified temperature includes: receiving temperature and humidity conditions outside the vehicle and temperature and humidity conditions inside the vehicle through an outside sensor located outside the vehicle and an inside sensor located inside the vehicle; and A designated temperature is set based on the received temperature and humidity conditions outside the vehicle and the received temperature and humidity conditions inside the vehicle.

3. The method according to claim 2, further comprising: Calculating the vehicle exterior integrated thermal resistance and the vehicle interior integrated thermal resistance according to the vehicle exterior temperature and humidity conditions and the vehicle interior temperature and humidity conditions; Calculating the electric power applied outside the vehicle according to the calculated integrated thermal resistance outside the vehicle, and calculating the electric power applied inside the vehicle according to the calculated integrated thermal resistance inside the vehicle; as well as A relatively large applied electric power is provided by comparing the calculated external-vehicle applied electric power and the calculated in-vehicle applied electric power with each other.

4. The method according to claim 3, wherein: The applied power in the current control cycle is calculated by the following equation: in, represents the integrated thermal resistance, represents the temperature of the heated glass, represents the specified temperature, and K represents the number of control cycles.

5. The method according to claim 3, wherein: The integrated thermal resistance is the sum of the radiation thermal resistance and the convection thermal resistance of the heating glass.

6. The method according to claim 3, wherein: The integrated thermal resistance is calculated taking into account the heat losses of the heating pane.

7. The method according to claim 1, wherein: Setting the designated temperature of the heated glass includes setting the designated temperature to a temperature with a relative humidity of 80% to 90% based on a hygrometer.

8. The method according to claim 1, wherein: When the designated temperature of the heated glass is set according to the temperature and humidity conditions measured by the sensor, the temperature of the heated glass in the current control cycle is calculated by the following equation based on the integrated thermal resistance and the temperature of the heated glass in the previous control cycle: Wherein, P[K] represents the applied power in the Kth control cycle, represents the integrated thermal resistance, represents the temperature of the heated glass, represents the specified temperature, and K represents the number of control cycles.

9. A method for controlling heated glass, the method comprising: Setting a specified temperature of the heated glass according to temperature and humidity conditions measured by a sensor; calculating the applied power to reach the specified temperature based on the integrated thermal resistance formed in the heated glass; performing phase shifting of two or more phases of alternating current (AC) power to provide the calculated applied power to the glass heating load; and The correction power is calculated taking into account the resolution of the sensor, the calculation comprising: In response to a resolution of the sensor being less than or equal to a set value, calculating a heat dissipation slope according to a temperature drop after reaching a specified temperature of the heated glass; setting a correction power based on the calculated heat dissipation slope; and performing phase shifting of two or more phases of AC power to provide the corrective power to the glass heating load; Among them, the corresponding operation is controlled according to the set control cycle.

10. The method according to claim 9, wherein: When power applied to the heated glass has a power value of 0% or 100% of power supplied from a power source after the temperature of the heated glass converges to the designated temperature, it is determined that the resolution of the sensor is less than or equal to the set value.

11. The method according to claim 9, wherein: In response to a resolution of the sensor being less than or equal to the set value, the correction power is set after the applied power calculated in the set control cycle is applied to the heating glass.

12. The method according to claim 9, wherein: By equation The heat dissipation slope is calculated, where: represents the temperature of the heated glass before the temperature drop after reaching the specified temperature, represents the temperature of the heated glass after the temperature drop, represents the time when the temperature drop occurs from the specified temperature, and K represents the number of control cycles.

13. The method according to claim 9, wherein: The correction power is given by the equation Calculate, where represents the correction power, represents the heat dissipation slope, represents the control cycle time, K represents the number of control cycles, and Indicates rated power.

14. The method according to claim 9, wherein: Calculating the heat dissipation slope according to the temperature drop after reaching the designated temperature of the heated glass includes: calculating the heat dissipation slope based on a time when the applied power is 0 W.

15. The method according to claim 14, wherein: The heat dissipation slope is calculated based on the time it takes for the temperature of the heating glass to decrease from the designated temperature by an amount corresponding to a minimum unit of a resolution of the sensor.

16. The method according to claim 9, wherein: It is determined that disturbance has occurred in the heated glass, and wherein, while performing phase shift of two or more phases of AC power to supply the correction power to a load of the heated glass, the applied power is calculated and supplied to the heated glass.

17. A system for controlling heated glass, comprising: Controller; as well as a memory storing an algorithm that, when executed by the controller, causes the system to: setting a specified temperature of the heated glass according to temperature and humidity conditions measured by a sensor; calculating the applied power to reach the specified temperature based on the integrated thermal resistance formed in the heated glass; performing phase shifting of two or more phases of alternating current (AC) power to provide the calculated applied power to the glass heating load; and calculating the correction power taking into account the resolution of the sensor, Wherein, the controller is configured to control corresponding operations according to a set control cycle.

18. The system of claim 17, wherein: The algorithm causes the system to set the specified temperature by: Receiving the temperature and humidity conditions outside the vehicle and the temperature and humidity conditions inside the vehicle through an outside sensor located outside the vehicle and an inside sensor located inside the vehicle; as well as A designated temperature is set based on the received temperature and humidity conditions outside the vehicle and the received temperature and humidity conditions inside the vehicle.

19. The system of claim 17, wherein: The algorithm causes the system to set the designated temperature of the heated glass by setting the designated temperature to a temperature at a relative humidity of 80% to 90% based on a hygrometer.

20. The system of claim 17, wherein: The algorithm causes the system to calculate the correction power by: calculating a heat dissipation slope according to a temperature drop after reaching a designated temperature of the heated glass, the calculation being performed in response to a resolution of the sensor being less than or equal to a set value; setting the correction power based on the calculated heat dissipation slope; as well as Phase shifting of two or more phases of AC power is performed to provide the corrective power to the glass heating load.

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