KR100792421B1 - Device for Indicating Open Air Temperature of Vehicles and Method thereof - Google Patents

Abstract

The present invention relates to an apparatus and a method for displaying an outside air temperature of a vehicle. More particularly, the present invention relates to an apparatus for displaying an outdoor temperature of a vehicle, and more particularly, to stop a vehicle by using an outside air temperature detected by an intake air temperature sensor and a coolant temperature detected by a water temperature sensor. The present invention relates to a device and a method capable of displaying the current outside air temperature under any conditions during slow motion and driving.

The outdoor temperature display apparatus of a vehicle according to the present invention includes an intake air temperature sensor 110 for sensing a temperature of air flowing into the engine 304 of the vehicle, and a temperature of a coolant for cooling heat generated by the engine 304. CAN in the engine ECU 100 and the engine ECU 100 for transmitting the water temperature sensor 112 and the intake temperature of the intake temperature sensor 110 and the coolant temperature of the water temperature sensor 104 through CAN communication. And a FATC display unit 200 which receives the intake air temperature and the coolant temperature transmitted through the communication, calculates the outside air temperature by correcting the intake air temperature with reference to the coolant temperature, and displays the displayed air temperature on the display 206.

Ambient temperature, display, intake air temperature sensor, water temperature sensor, calibration.

Description

Device for Indicating Open Air Temperature of Vehicles and Method

1A and 1B are views illustrating an external air temperature display device and method of a conventional vehicle;

2 is a configuration diagram showing an outdoor temperature display apparatus of a vehicle according to the present invention;

3 is an installation state diagram of the intake air temperature sensor shown in FIG. 2;

Figure 4 is a flow chart showing a method for displaying outside temperature of a vehicle according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: engine ECU 102: microcomputer

104: input and output unit 110: intake air temperature sensor

112: water temperature sensor 200: FATC display unit

202: micom 204: memory

206: display

The present invention relates to an apparatus and a method for displaying an outside air temperature of a vehicle. More particularly, the present invention relates to an apparatus for displaying an outdoor temperature of a vehicle, and more particularly, to stop a vehicle by using an outside air temperature detected by an intake air temperature sensor and a coolant temperature detected by a water temperature sensor. The present invention relates to a device and a method capable of displaying the current outside air temperature under any conditions during slow motion and driving.

In general, there is a high temperature difference between the inside and the outside of the vehicle during the summer and winter, the vehicle is equipped with a convenience device for displaying the temperature outside.

Full Auto Temperature Control (FATC), the vehicle's automatic temperature control system, installs an outside air temperature sensor in the center stay in the engine room and displays the temperature detected by the outside air temperature sensor as the outside air temperature.

However, since the outside air temperature sensor is installed at the bottom of the engine room, it is difficult to detect the correct temperature at the time of stopping or slowing due to the heat generated from the engine and the geothermal heat of the road.

Typically, when the moving speed of the vehicle is below a certain speed or in a stopped state, the temperature of the outside air cannot be accurately detected due to the influence of the vehicle engine or geothermal heat, and thus the outside temperature of the display device is not updated.

For example, when the driver turns on the key switch for the first time, the vehicle detects the temperature because it is in a stopped state. However, the driver does not display the actual detected temperature. The display shows the temperature.

However, when the temperature is different because the time difference between turning the key switch off and turning it on again is large, the difference between the temperature felt by the driver and the temperature of the display device is large.

In order to overcome this problem, Korean Laid-Open Patent Publication No. 10-2005-0028599 displays the outside temperature of a vehicle using information such as a water temperature sensor and a vehicle speed sensor as well as an outside temperature sensor.

As shown in FIG. 1A, the outside air temperature detected by the outside air temperature sensor 20, the vehicle speed detected by the vehicle speed sensor 22, and the coolant temperature detected by the water temperature sensor 24 are included in the microcomputer 12 of the FATC display unit 10. When input to, the microcomputer 12 stores the outside air temperature in the memory 14 and outputs to the display 16, and compares the vehicle speed and the coolant temperature with the set value to output the previous outside temperature or the current outside temperature on the display 16 To display.

As illustrated in the flowchart of FIG. 1B, when the vehicle is started (S102), the outside air temperature sensor 20 senses the outside air temperature and transmits it to the microcomputer 12 (S104).

In step S104, the water temperature sensor 24 also detects the coolant temperature and transmits it to the microcomputer 12.

The microcomputer 12 compares the coolant temperature with a set temperature (for example, 50 ° C.) (S106), and displays the current outside air temperature detected by the outside temperature sensor 20 when the coolant temperature is lower than the set temperature (S110). ).

When the coolant temperature is higher than the set temperature, the vehicle speed detected by the vehicle speed sensor 22 is compared with the set vehicle speed (for example, 25 km / h) (S108). S110), when the speed of the vehicle is lower than the set vehicle speed, the previously detected outside air temperature is displayed (S114).

The above steps are determined to determine whether the vehicle is turned off (S112) and repeatedly performed until the vehicle is turned off.

The above-mentioned patent solves the problem of not being able to display the actual outside temperature at the first start, but does not update the display of the outside temperature in the state of stopping or running slowly, and does not allow sufficient time after the start-up is turned off. In this case, there was a problem in that the display of the outside temperature could not be updated.

In other words, even if the place is not changed in winter or summer, the temperature of 5 ℃ is changed in 1 ~ 2 hours at sunset / sunrise time, but the temperature of coolant cannot be lowered enough. The outside temperature is not updated.

The present invention has been made in order to solve the above problems, by using the outside air temperature sensed by the intake air temperature sensor used in the air volume sensor used for engine control and the coolant temperature detected by the water temperature sensor any of the vehicle stop, slow, running It is an object of the present invention to provide a vehicle outdoor temperature display apparatus and method that can display the current outside temperature even under the conditions.

In order to achieve the above object, an outdoor temperature display apparatus of a vehicle includes an intake air temperature sensor that senses a temperature of air flowing into an engine of a vehicle, and a temperature of cooling water that cools heat generated from the engine. Receives the water temperature sensor for detecting the intake temperature and the coolant temperature of the intake temperature sensor and the coolant temperature of the water temperature sensor via CAN communication and the intake temperature and the coolant temperature transmitted through the CAN communication from the engine ECU, It includes a FATC display unit that calculates and displays the outside air temperature on the display by correcting the intake air temperature with reference to the temperature.

In addition, the method for displaying the outside air temperature of the vehicle according to an embodiment of the present invention, the step of measuring the coolant temperature and intake temperature in the water temperature sensor and the intake air temperature sensor while the vehicle is started and transmitting to the microcomputer through the input and output unit of the engine ECU; And transmitting the coolant temperature and the intake temperature from the microcomputer of the engine ECU to the microcomputer of the FATC display unit using CAN communication, and the higher the coolant temperature in the microcomputer, the intake temperature is proportionally higher than the actual outside temperature. Calculating the outside air temperature by correcting the intake air temperature with reference to the coolant temperature, and outputting and displaying the outside air temperature calculated by the microcomputer on the display and repeating the above steps until the vehicle is turned off. Performing a step of updating the display of the outside temperature.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a configuration diagram illustrating an outdoor temperature display device of a vehicle according to the present invention, and FIG. 3 is a diagram illustrating an installation state of the intake air temperature sensor illustrated in FIG. 2.

As shown, the intake air temperature sensor 112, the water temperature sensor 114, the engine ECU 100 and the FATC display unit 200 in CAN communication with the engine ECU (100).

The water temperature sensor 112 senses the coolant temperature and transmits it to the microcomputer 102 through the input / output unit 104 of the engine ECU 100, and the intake air temperature sensor 110 is shown in FIG. 3. The temperature of the air sucked into the air is sensed and transmitted to the microcomputer 102 through the input / output unit 104 of the engine ECU 100.

The coolant temperature is the most widely used variable in the engine control of a vehicle, and the characteristics and measurement methods are simple but very important signals.

The water temperature sensor 112 converts the temperature into a voltage using a kind of variable resistor that detects the coolant temperature and transmits the temperature to the engine ECU 100.

The water temperature sensor 112 is mounted in a water jacket, an intake manifold, or a coolant passage of a cylinder head of a cylinder block through which coolant flows so that the thermistor portion may contact the coolant.

In order to determine the fuel amount in the engine control of the vehicle, it is necessary to accurately measure the amount of air sucked into the engine 304.

Currently, the most applied air flow sensor is a hot film sensor in which the intake air temperature sensor 110 is built in the form of a hot film.

The intake air temperature sensor 110 embedded in the hot film sensor detects the air temperature flowing into the engine 304 and is installed behind the air cleaner 302.

At this time, the hot film is positioned in a circular shape (usually a mesh-mesh type) in a passage through which intake air flows behind the air cleaner 302.

Since the air sucked through the air cleaner 302 is sucked from the front upper end of the vehicle, the air is hardly affected by the geothermal heat, and since the suction speed is very high, the engine heat is also less affected than the prior art.

The microcomputer 102 of the engine ECU 100 inputs the intake air temperature of the intake air temperature sensor 110 and the coolant temperature of the water temperature sensor 112 into the microcomputer 202 of the FATC display unit 200 through CAN communication.

Since the heat is generated in the engine 304, the intake air temperature detected by the intake air temperature sensor 110 does not exactly match the actual outside air temperature.

As the coolant temperature increases, the temperature detected by the intake air temperature sensor 110, that is, the intake air temperature is detected to be higher than the actual temperature. By using this principle, the temperature detected by the intake air temperature sensor 110 for each coolant temperature is corrected so that the actual outside temperature The degree can be calculated.

The microcomputer 202 of the FATC display unit 200 corrects the intake air temperature for each coolant temperature, calculates the actual outside temperature, and outputs the result to the display 206 to display the outside air temperature.

4 is a flowchart illustrating a method of displaying outside temperature of a vehicle according to the present invention.

When the vehicle is started (S402), the water temperature sensor 112 and the intake air temperature sensor 110 measures the coolant temperature and the intake air temperature and transmits them to the microcomputer 102 through the input / output unit 104 of the engine ECU 100 ( S404).

The microcomputer 102 of the engine ECU 100 transmits the coolant temperature and the intake air temperature to the microcomputer 202 of the FATC display unit 200 using CAN communication (S406).

The microcomputer 202 of the FATC display unit 200 calculates the actual outside air temperature by correcting the intake air temperature by referring to the coolant temperature by using a principle that the intake temperature is detected and measured proportionally higher than the actual outside temperature as the coolant temperature is higher. (S408).

That is, if the coolant temperature is high, the outside air temperature is calculated through a correction for lowering the intake temperature sensed by the intake temperature sensor 110 a lot, and if the coolant temperature is medium, a correction for slightly lowering the intake temperature detected by the intake temperature sensor 110 is performed. Calculate the outside air temperature, and if the coolant temperature is low, the intake air temperature detected by the intake air temperature sensor 110 is calculated as the outside air temperature.

The microcomputer 202 outputs and displays the calculated actual outside air temperature on the display 206.

By determining whether the start of the vehicle is OFF (S412) and repeatedly performing the above steps until the OFF state, the current actual outdoor temperature can be displayed and updated.

Since the air flowing into the engine 304 is introduced in a large amount at a high speed in the upper front of the vehicle, the intake temperature of the engine 304 is almost unaffected by the geothermal heat and slightly by the engine heat, but the outside air temperature of the prior art The degree of influence is smaller than that of the sensor and can be corrected with reference to the coolant temperature of the water temperature sensor 112.

As such, by removing the conventional external air temperature sensor and using the intake air temperature sensor 110 and the water temperature sensor 112 that are already installed, the temperature of the external air can be measured and the display is updated in the state of starting regardless of the vehicle driving conditions. Can be.

As described above, according to the present invention, by measuring the intake air temperature of the engine less affected by geothermal or engine heat and correcting for each coolant temperature to display the actual outside air temperature, it detects the outside temperature regardless of the vehicle driving. I can display it.

In addition, the cost can be reduced by deleting the outside air temperature sensor separately installed in the engine room to display the outside air temperature and using the information of the intake air temperature sensor installed in the engine.

Claims (4)

Intake air temperature sensor 110 for sensing the temperature of the air flowing into the engine 304 of the vehicle; A water temperature sensor 112 for sensing a temperature of cooling water for cooling the heat generated by the engine 304; An engine ECU 100 transmitting the intake air temperature of the intake air temperature sensor 110 and the coolant temperature of the water temperature sensor 104 through CAN communication; And Receives the intake air temperature and the coolant temperature transmitted through the CAN communication in the engine ECU 100, using the principle that the intake temperature is detected in proportion to higher than the actual outside temperature as the coolant temperature is higher, according to the elevation of the coolant temperature And a FATC display unit (200) for calculating and displaying the outside air temperature on the display (206) by correcting the intake air temperature by lowering the value of the intake air in proportion to the outside air temperature display device. The method of claim 1, The intake air temperature sensor (100) is installed at the rear of the air cleaner (302), the outside temperature display device of a vehicle, characterized in that built in a hot film sensor for measuring the amount of air. delete Measuring the coolant temperature and the intake temperature of the water temperature sensor 112 and the intake air temperature sensor 110 in the state where the vehicle is started and transmitting them to the microcomputer 102 through the input / output unit 104 of the engine ECU 100; Transmitting, by the microcomputer 102 of the engine ECU 100, the coolant temperature and the intake air temperature to the microcomputer 202 of the FATC display unit 200 using CAN communication; Calculating the outside air temperature by correcting the intake air temperature with reference to the cooling water temperature by using the principle that the temperature of the cooling water in the microcomputer 202 is higher than the actual outside temperature; Outputting and displaying the outside air temperature calculated by the microcomputer 202 on the display 206; And And repeating the above steps until the vehicle is turned off to update the display of the outside temperature.

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