KR20030017849A - Method for fogging point detection of vehicles - Google Patents

Abstract

PURPOSE: A method for detecting fogging point of a vehicle is provided to take appropriate action before windows of vehicle are fogged. CONSTITUTION: A method includes the steps of: a first step(S106,S108,S110,S116) detecting relative humidity in a car room to calculate absolute vapor quantity and saturated vapor quantity when temperature of outside air is higher than indoor temperature; a second step(S120,S124) calculating probability of fogging by subtracting the saturated vapor quantity from the absolute vapor quantity and comparing with preset control objective value; and a third step(S126) determining point of fogging if the probability of fogging is equal to the control objective value.

Description

Method for fogging point detection of vehicles

The present invention relates to a method of detecting the occurrence of steaming in a vehicle, and more specifically, to detect the air temperature, the outside temperature, and the internal humidity of a vehicle to calculate the amount of saturated steam for the outside temperature, and thus to control the wind direction when the frequency of the steaming occurrence reaches a limit. Or it relates to a method of detecting the occurrence of the mist of the vehicle to prevent the mist is generated in the windshield of the vehicle through the temperature control.

Generally, due to the difference between the inside temperature of the vehicle and the outside temperature during the vehicle operation, the moisture inside the vehicle also causes steaming on the inside of the glass window of the vehicle.

The control logic to remove the mist is to operate the vehicle's air conditioner and switch the wind direction toward the windshield to remove the mist generated in the windshield. However, these control logics have been applied to other vehicles without verification of the data specified through actual vehicle tests. Therefore, the defogging device operated by another control logic that is not suitable for the vehicle environment has a problem that the air conditioner of the vehicle operates even under the condition that the defogging occurs on the glass window.

In order to improve this problem, conventionally, an artificial control logic is used to implement the automatic defogging logic.

The patent disclosed in this regard is US Patent Registration "5,516,041" (Heating, Ventilation and Air Conditioning (HVAC) system control method and apparatus for anti-fogging) will be described with reference to FIG.

1 is a block diagram of an HVAC system control apparatus for preventing fog in accordance with the prior art, the HVAC system is a signal detected by the air temperature, the outside air temperature, engine coolant temperature (ECT), exhaust temperature, humidity sensor of the vehicle to provide.

Each of the signals is provided to the electronic controller 40 after being adjusted by the controller 42.

The electronic controller 40 measures an input signal for use by the hardware controller 44 and provides a measured output signal. Here, the hardware controller 44 controls the vacuum or the electronic doors 22 to 28 and the blower 32 in order to adjust the temperature and the air flow, thereby preventing the vehicle window from fog.

The position of the blend door 26 is fed back to the hardware controller 44 when the return arrow is displayed.

In the fuzzy logic system block, the sensor input is adjusted, measured, and passed by the fuzzy estimation engine of the electronic controller 40.

The regulation setting unit 46 sets various control functions, that is, blowing speed, offset, target value setting, mode change, recirculation / freshness, term calibration, and the like, and provides the fuzzy estimation engine in detail about the plan to be performed.

The purge output is measured and passed for the control routines of motors, actuators and doors to perform the flow and regulation of air supplied to the vehicle. The ruleset principle for control constitutes a plan in such a way that the control operation can be easily calibrated and adjusted.

The use of artificial intelligence control logic in the HVAC system of the vehicle according to the prior art has the effect of improving the function of detecting and preventing fog caused by windshield and other glass of the vehicle, but such automatic frost detection and removal logic This complexity is so complex that logic designers and programmers have difficulty implementing it.

The present invention is to solve the above-mentioned problems of the prior art, the purpose is to detect the air temperature of the vehicle, the outside temperature, the internal humidity of the vehicle to calculate the amount of saturated steam for the outside air temperature to reach the limit of the occurrence of steaming The present invention provides a method for detecting a fogging point of a vehicle to detect a point so that appropriate measures can be taken before the fogging occurs on the glass of the vehicle.

1 is a block diagram of an antifogging device of a vehicle according to the prior art,

2 is a block diagram of an apparatus for detecting a fogging point of a vehicle according to the present invention;

3 is a flowchart of a process of detecting a fogging point of a vehicle according to an embodiment of the present invention;

4 is a saturated steam curve according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

100: microprocessor 111: outside sensor

112: bet sensor 113: humidity sensor

121: memory

A method of detecting a fogging point of a vehicle for achieving the object of the present invention is a method of detecting the fog of the vehicle to detect the indoor temperature, the outside air temperature and the humidity of the vehicle at predetermined intervals in order to remove the fog formed on the windshield of the vehicle. In the first step of detecting the relative humidity in the vehicle when the detected outside air temperature of the vehicle is higher than the vehicle temperature, the first process of calculating the absolute water vapor and the saturated water vapor in the current car, and subtracting the saturated water vapor amount from the absolute water vapor generation rate of steaming rim And a second process of comparing the control target value with a preset control target value, and a third process of determining the occurrence of the simmering point when the rate of occurrence of fog is identical to the control target value.

The present invention made as described above will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an apparatus for detecting a rim of a vehicle for implementing the present invention. As shown therein, an outside air sensor 111 for detecting an outside temperature of a vehicle and an indoor sensor 112 for detecting an indoor temperature of a vehicle are shown. ), A humidity sensor 113 for detecting indoor humidity of the vehicle, a memory 121 for storing absolute water vapor data and room temperature calculation data and a program for calculating a fogging point, and the outside air sensor 111, It is composed of a microprocessor 100 for receiving the temperature and humidity detected from the internal memory 112 and the humidity sensor 113 to determine the generation point of the fog according to the program and setting data stored in the memory 121.

When described in more detail with reference to Figures 2 and 3 attached to the operation according to the embodiment of the present invention configured as follows.

First, the present invention is provided with a bet sensor 112 on one side of the inside of the vehicle to detect the internal temperature of each vehicle, as shown in FIG. The outside air sensor 113 is provided on one side of the vehicle to detect the temperature, and the humidity sensor 113 is provided on one inside of the vehicle to detect the internal humidity of the vehicle.

As described above, the indoor and outdoor air temperature and humidity values detected by the sensors 111 to 113 provided as described above are calculated to determine the occurrence of the simmering fog.

The current indoor temperature value detected by the bet sensor 112 provided on one side of the vehicle is converted into a digital signal and input to the microprocessor 100 (S102).

In addition, the outside air temperature value detected by the outside air sensor 111 provided on one side of the vehicle is converted into a digital signal and input to the microprocessor 100 (S104).

The microprocessor 100 determines whether the outside air temperature of the vehicle is higher than the room temperature by calculating a difference between the outside air temperature and the inside air temperature inputted from the inside sensor 112 and the outside air sensor 111, respectively (S106).

If the room temperature is higher than the outside temperature, no fog occurs inside the glass window, so return to the initial stage.

However, if the room temperature is higher than the outside temperature, the relative humidity of the current room of the vehicle detected by the humidity sensor 113 provided on one side of the vehicle is converted into a digital signal and input to the microprocessor 100. (S108)

Using the input indoor and outdoor temperature and relative humidity, the amount of absolute water vapor present in the air inside the vehicle is calculated as in Equation 1 below (S114).

Absolute water vapor content in air at a specific temperature = (relative humidity% RH at a specific temperature) × (Saturated water vapor at a specific temperature)

Here, the saturated steam amount at a specific temperature is detected from the saturated steam curve data as shown in FIG. 4 stored in the memory (S115).

Absolute Vapor Quantity (AV) is determined at the room temperature of the current vehicle based on the calculated value.

The water vapor inside the vehicle calculated as described above is condensed with the frost while being in contact with the windshield that is cooled by the outside temperature. In order to calculate the amount of condensed water vapor, the temperature outside the vehicle, that is, the saturated vapor quantity (ambient) (SV) with respect to the outside air temperature, is obtained from the saturated steam curve data stored in the memory 121 (S116).

The microprocessor 100 calculates a Probability of Fogging (PF) as shown in the following Equation 2 based on the absolute water vapor amount AV and the Target of Saturated Vapor Quantity (TSV) calculated as described above. (S120)

PF = AV (incar) -TSV (amb)

The microprocessor 100 determines this when the frequency of the occurrence of the blurring sum calculated as in Equation 2 is increased to reach the control target value set in the memory 121. (S122) (S124).

When it is determined that the condition is generated by comparing the frequency of occurrence of the mist and the control target value calculated by the microprocessor 100, the external air mode switching, wind direction switching to the windshield and air conditioner driving The operation proceeds. (S126)

Although a preferred embodiment according to the present invention has been described above, various modifications are possible, and other persons skilled in the art may implement various modifications and modifications without departing from the claims of the present invention. It is understood that it can be done.

As described above, the present invention detects the internal temperature of the vehicle, the outside temperature, and the internal humidity of the vehicle, calculates the amount of saturated water vapor to the outside temperature, and detects the limit of the frequency of the occurrence of steaming. Through not only prevents the occurrence of fog on the windshield of the vehicle in advance, the driver does not need a separate operation to remove the fog formed on the windshield of the vehicle is effective in promoting safe driving.

Claims (4)

In the method of detecting the mist of the vehicle to detect the indoor temperature, the outside temperature and the humidity of the vehicle at predetermined intervals in order to remove the mist formed in the windshield of the vehicle, A first process of detecting the absolute humidity and the saturated steam amount in the current vehicle by detecting the relative humidity in the vehicle when the detected outside temperature of the vehicle is higher than the temperature in the vehicle; A second step of subtracting the amount of saturated water vapor from the absolute amount of water vapor to calculate a fog generation rate and comparing it with a preset control target value; And And a third process of determining a fogging point when the fogging rate coincides with the control target value. The method of claim 1, wherein the absolute water vapor amount of the current temperature in the first process A method of detecting a fogging point of a vehicle characterized in that it is calculated by "relative humidity (% RH) at present temperature x saturated water vapor at present temperature". The method according to claim 1 or 2, wherein the amount of saturated steam calculates the amount of saturated steam corresponding to the current temperature from the saturated steam curve map data. 3. The fogging point of the vehicle according to claim 1 or 2, wherein the control target value of the third process is set with reference to the type of sensor, the size of the evaporator, the interior volume of the vehicle, the engine exhaust amount, and the coolant temperature. Detection method.