KR102506875B1 - Tire pressure monitoring apparatus and method - Google Patents

Abstract

The present invention relates to a tire air pressure monitoring apparatus and method, and relates to a receiver for receiving air pressure for each tire measured by a tire air pressure measuring device mounted on each tire of a vehicle, an air pressure sensor for measuring atmospheric pressure outside the vehicle, and an air pressure sensor for measuring atmospheric pressure outside the vehicle. and a processor for correcting the standard air pressure based on the measured air pressure and determining whether a low pressure warning is issued for the measured air pressure for each tire based on the corrected standard air pressure.

Description

Tire air pressure monitoring device and method {TIRE PRESSURE MONITORING APPARATUS AND METHOD}

The present invention relates to a tire air pressure monitoring device and method for monitoring tire air pressure in consideration of the external atmospheric pressure of a vehicle.

The Tire Pressure Monitoring System (TPMS) is a safety system that prevents accidents due to tire damage by detecting tire air pressure and alerting the driver in case of insufficient air pressure. This TPMS notifies the driver of the internal pressure of the tire in advance, which can cause tire rupture or reduced tire pressure, resulting in increased contact area with the ground, shortening the life of the tire, and deteriorating fuel efficiency due to increased fuel consumption. TPMS application is regulated by law.

The tire pressure measurement method of the TPMS is divided into a direct method in which the tire pressure is directly measured through a sensor and an indirect method in which the tire pressure is measured using a wheel speed measured through a wheel speed sensor.

Conventional TPMS outputs tire air pressure information by correcting it based on 14.5 psi, which is atmospheric pressure at an altitude of 0 m above sea level. At high altitudes, the air pressure displayed on the cluster is lower than the air pressure actually measured by the air pressure gauge due to low atmospheric pressure.

For example, in the case of Mexico, more than 50% of the country's land is highland, reaching 2,600 m in the center and 1,200 m in the north. In fact, in the case of drivers residing in the highlands of Mexico at an altitude of 2,000m or higher, the tire air pressure displayed on the cluster in the vehicle is about 3 psi lower than the pressure checked by the air pressure gauge, resulting in a low pressure false alarm.

An object of the present invention is to provide a tire air pressure monitoring apparatus and method for providing tire air pressure information and a low pressure alarm by compensating for changes in the internal temperature of a tire and changes in atmospheric pressure according to altitude when monitoring tire air pressure of a vehicle.

In order to solve the above problems, a tire air pressure monitoring device according to an embodiment of the present invention includes a receiver for receiving air pressure for each tire measured by a tire air pressure measuring device mounted on each tire of a vehicle, and measuring atmospheric pressure outside the vehicle. and a processor that corrects a reference air pressure based on the atmospheric pressure and determines whether a low pressure warning is issued for the measured air pressure for each tire based on the corrected reference air pressure.

The processor is characterized in that the atmospheric pressure change amount is calculated using the measured atmospheric pressure, and the reference air pressure is corrected in consideration of the calculated atmospheric pressure change amount.

The processor may measure the internal temperature of the tire using a temperature sensor provided in the tire air pressure measurement device, and correct the reference air pressure in consideration of a change in the measured internal temperature of the tire.

The processing unit is characterized in that the reference air pressure is corrected in consideration of the change in the tire internal temperature and the atmospheric pressure.

The tire air pressure monitoring device may further include a GPS receiver for measuring a current location of the vehicle.

The processor is characterized in selecting tire pressure monitoring logic according to the current position of the vehicle.

The tire air pressure monitoring device may further include a display displaying a low pressure warning according to control of the processor.

The processor may correct the measured air pressure for each tire by reflecting the change in atmospheric pressure, and display the corrected air pressure on the display.

Meanwhile, a tire air pressure monitoring method according to an embodiment of the present invention includes the steps of measuring the atmospheric pressure outside the vehicle, correcting the reference air pressure based on the measured atmospheric pressure, measuring the air pressure for each tire of the vehicle, and and determining whether a low pressure warning is given for the measured air pressure of each tire based on the corrected reference air pressure.

The correcting of the reference air pressure may include calculating a change in atmospheric pressure using the measured atmospheric pressure, and correcting the reference air pressure in consideration of the change in atmospheric pressure.

In the step of measuring the atmospheric pressure, the temperature inside the tire is measured.

The step of correcting the reference air pressure may include correcting the reference air pressure in consideration of a change in the internal temperature of the tire.

The step of correcting the reference air pressure may include correcting the reference air pressure in consideration of changes in the internal temperature of the tire and the atmospheric pressure.

The method may further include measuring a current location of the vehicle before measuring the atmospheric pressure, and selecting a tire air pressure monitoring logic based on the measured current location of the vehicle.

After the step of determining whether or not the low pressure warning is given, a result of determining whether or not the low pressure warning is issued is output, and the measured air pressure for each tire is corrected and output by reflecting the change in atmospheric pressure.

The present invention may provide information on air pressure and a low pressure alarm by compensating for a change in the internal temperature of a tire and a change in atmospheric pressure according to an altitude when monitoring air pressure in a tire of a vehicle. Therefore, the present invention can prevent accidents caused by tire bursting or the like in advance.

In addition, according to the present invention, it is possible to prevent false tire air pressure low pressure alarms by correcting the low pressure alarm reference level according to a change in altitude.

1 is a block diagram showing a tire air pressure monitoring system according to an embodiment of the present invention.
Figure 2 is a configuration diagram showing the air pressure sensor shown in Figure 1;
3 is a flowchart illustrating a method for monitoring tire air pressure according to an embodiment of the present invention.
4 is an embodiment illustrating a tire air pressure monitoring process shown in FIG. 3;
5 is another embodiment illustrating a tire air pressure monitoring process shown in FIG. 3;

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In general, tire air pressure measured by a TPMS (Tire Pressure Monitoring System) sensor is composed of tire internal pressure and atmospheric pressure. However, the tire air pressure measured by the TPMS sensor is a corrected value by applying 14.5 Psi, the standard atmospheric pressure based on sea level (0m). will occur Accordingly, a compensation logic for compensating for a difference between the tire air pressure measured by the TPMS sensor and the tire air pressure actually measured using the air pressure measuring device is required.

In other words, when injecting air pressure using an air pressure measuring device at high altitudes, a difference by the amount of change in atmospheric pressure occurs, so when the standard air pressure is injected, the air pressure displayed on the cluster is insufficient by the difference, so the low pressure alarm margin is not secured and the warning light does not turn off even if air pressure is injected in case of low pressure. may occur.

An object of the present invention is to provide accurate tire air pressure information by compensating for a difference from a measured tire air pressure due to a change in atmospheric pressure according to altitude, and to prevent a low pressure false alarm.

FIG. 1 is a block configuration diagram showing a tire air pressure monitoring system according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing an air pressure sensor shown in FIG. 1 .

As shown in FIG. 1 , the tire air pressure monitoring system includes a tire air pressure measuring device 100 and a tire air pressure monitoring device 200 .

The tire air pressure measurement device 100 is mounted on each tire of a vehicle to measure tire air pressure. The tire air pressure measuring device 100 includes a transmitter 110, an air pressure sensor 120, a temperature sensor 130, a memory 140 and a processor 150.

The transmitter 110 performs wireless communication under the control of the processor 150 . The transmitter 110 transmits data measured by the air pressure sensor 120 and/or the temperature sensor 130 as a radio signal (RF signal).

The air pressure sensor 120 measures tire internal pressure, that is, tire air pressure.

The temperature sensor 130 measures the internal temperature of the tire.

The memory 140 stores a program for performing the operation of the processor 150. The memory 140 stores data measured by the air pressure sensor 120 and the temperature sensor 130 . The memory 140 includes flash memory, random access memory (RAM), read only memory (ROM), electrically erasable and programmable ROM (EEPROM), erasable and programmable ROM (EPROM), and registers. It may be implemented with at least one of storage media (recording media).

The processor 150 controls the overall operation of the tire pressure measuring device 100 . The processor 150 may be implemented as a central processing unit (CPU), a micro controller unit, a micro computer, or a microprocessor.

Processor 150 transmits the tire air pressure measured by air pressure sensor 120 via transmitter 110 . In addition, the processing unit 150 transmits the tire internal temperature measured by the temperature sensor 130 through the transmitter 110 .

The tire air pressure monitoring device 200 measures the tire air pressure through the tire air pressure measuring device 100 and outputs an alarm when the measured tire air pressure falls below the recommended air pressure, that is, the standard air pressure. The tire air pressure monitoring device 200 includes a receiver 210, a Global Positioning System (GPS) receiver 220, an air pressure sensor 230, a memory 240, a display 250, and a processor 260. Processor 260 is connected to GPS receiver 220 and display 250 via an in-vehicle network. The in-vehicle network may be implemented with a Controller Area Network (CAN), a Media Oriented Systems Transport (MOST) network, a Local Interconnect Network (LIN), and/or X-by-Wire (Flexray).

The receiver 210 receives a radio signal transmitted from the transmitter 110 of the tire air pressure measuring device 100.

The GPS receiver 220 measures the current location of the vehicle. The GPS receiver 220 calculates the vehicle position using signals transmitted from GPS satellites.

The atmospheric pressure sensor 230 measures the external air pressure of the vehicle, that is, the atmospheric pressure. As shown in FIG. 2 , the air pressure sensor 230 includes a diaphragm capable of receiving air pressure and a measurement gauge for detecting a change in air pressure when air pressure is applied to the diaphragm. The measuring gauge is a piezo electric element that generates voltage when pressure is applied.

Memory 240 may store software programmed to cause processor 260 to perform predetermined operations. The memory 240 may temporarily store input/output data of the processor 260. The memory 240 may store atmospheric pressure measured by the atmospheric pressure sensor 230 and data received through the receiver 210 . The memory 240 may store tire pressure monitoring logics.

The memory 240 includes a flash memory, a hard disk, a secure digital card (SD card), a random access memory (RAM), a read only memory (ROM), and a web storage (web). storage) may be implemented as at least one storage medium.

The display 250 outputs a tire pressure and/or a low tire pressure warning. The display 250 may include a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) display, and a flexible display. display), a 3D display, a transparent display, a head-up display (HUD), a touch screen, and a cluster.

The display 250 may also include an audio output module such as a speaker capable of outputting audio data. For example, the display 250 may output a warning sound indicating a low tire pressure through a speaker.

The processor 260 controls the overall operation of the monitoring device 200 . The processor 260 includes application specific integrated circuits (ASICs), digital signal processors (DSPs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), central processing units (CPUs), microcontrollers and microprocessors. (microprocessors) may include at least one.

Processor 260 selects tire pressure monitoring logic based on vehicle location measured via GPS receiver 220 . In this embodiment, since regulations (regulations) for checking tire air pressure are different for each country or region, a tire air pressure monitoring logic is selected based on vehicle location information.

Processor 260 checks the tire pressure according to the selected tire pressure monitoring logic to determine whether a low pressure warning is present. The processor 260 outputs a low pressure warning (warning) to the display 250 according to the determination result. At this time, the processor 260 displays the air pressure state (eg, low pressure or normal) for each tire.

# 1st tire air pressure monitoring logic

Processor 260 measures atmospheric pressure P _atm via barometric pressure sensor 230 . The processor 260 calculates the atmospheric pressure change ΔP _atm using the measured atmospheric pressure. The atmospheric pressure change ΔP _atm can be expressed as the following [Equation 1].

Here, P _sea is the atmospheric pressure at sea level.

The processor 260 measures air pressures P _FL , P _FR , P _RL , and P _RR for each tire through the air pressure sensor 120 of the measuring device 100 . That is, the processor 260 measures the air pressure of the front left tire (P _FL ) and the air pressure of the right front tire (P _FR ) through the measurement device 100 mounted on the front left tire, the front right tire, the rear left tire, and the rear right tire, respectively. , the rear left tire air pressure (P _RL ) and the rear right tire air pressure (P _RR ) are measured.

The processor 260 determines whether there is a change in atmospheric pressure based on the atmospheric pressure change ΔP _atm . In other words, processor 260 determines that there is no atmospheric pressure change if the atmospheric pressure change is zero, and determines that there is an atmospheric pressure change if the atmospheric pressure change is not zero.

When there is no change in atmospheric pressure, the processor 260 uses the existing recommended cold pressure P _Rec (eg, 34 Psi) as a reference air pressure to check the state of air pressure for each tire. The standard air pressure for low pressure warning varies by country or region, and is determined based on the recommended air pressure. For example, the low pressure warning standard air pressure is determined as -25% of the recommended air pressure or -20% of the operating air pressure. The processor 260 determines a low pressure warning when the air pressure of each tire is less than the low pressure warning standard air pressure (eg, 27 Psi).

When there is a change in atmospheric pressure, the processor 260 corrects the recommended air pressure P _Rec in consideration of the atmospheric pressure change ΔP _atm . The corrected recommended air pressure P' _Rec can be expressed as in [Equation 2].

For example, when the recommended air pressure P _Rec is 34PSi and the atmospheric pressure change ΔPatm is -4Psi, the processor 260 adds the atmospheric pressure change ΔPatm to the recommended air pressure P _Rec to obtain a corrected recommended air pressure P′ _Rec 30Psi. Therefore, the low pressure warning standard air pressure becomes 24 Psi, which is -20% of the corrected recommended air pressure standard.

The processor 260 corrects the measured air pressure P _tpms for each tire in consideration of the atmospheric pressure change ΔP _atm . In other _{words, the processor 260 calculates the air pressure P cluster for} each tire displayed on the cluster 250 by adding the atmospheric pressure change ΔP _atm to the measured air pressure P tpms for each tire (see Equation 3).

# 2nd tire air pressure monitoring logic

Next, a process of checking the tire air pressure according to the second tire air pressure monitoring logic will be described.

Processor 260 measures atmospheric pressure and tire internal temperature through air pressure sensor 230 and temperature sensor 130 of measurement device 100 . The processor 260 calculates the atmospheric pressure change ΔP _atm based on the measured atmospheric pressure P _atm using [Equation 1]. The processor 260 calculates the recommended operating air pressure P _Warm according to the change in the internal temperature of the tire using [Equation 4]. In addition, the processor 260 calculates the recommended operating air pressure _P'Warm according to the change in the temperature inside the tire and the change in atmospheric pressure according to [Equation 5].

Here, T ₀ is the initial temperature inside the tire, and T is the change temperature inside the tire.

The processor 260 measures the air pressure of each tire through the measuring device 100 mounted on each tire. Then, the processor 260 determines whether there is a change in atmospheric pressure based on the amount of change in atmospheric pressure.

When there is no change in atmospheric pressure, the processor 260 checks the state of air pressure for each tire based on the air pressure P _warm recommended for operation according to temperature change.

Meanwhile, when there is a change in atmospheric pressure, the processor 260 checks the state of air pressure for each tire based on the recommended operating air pressure _P'Warm according to the change in the internal temperature of the tire and the change in atmospheric pressure.

The processor 260 calculates the air pressure P _cluster for each tire displayed on the display 250 by reflecting the atmospheric pressure variation ΔP _atm in the measured air pressure P _tpms for each tire.

3 is a flowchart illustrating a method for monitoring tire air pressure according to an embodiment of the present invention.

Referring to FIG. 3 , the processor 260 measures the current location of the vehicle through the GPS receiver 220 (S10). In other words, processor 260 uses GPS receiver 220 to obtain vehicle location information.

Processor 260 selects tire pressure monitoring logic based on the location information (S20). For example, if the vehicle is located in North America, the processor 260 selects a first tire pressure monitoring logic that checks the tire pressure based on the corrected recommended air pressure by correcting the recommended air pressure in consideration of changes in atmospheric pressure without considering the effect of temperature when the vehicle is located in North America. do. On the other hand, if the vehicle is located in Europe, the processor 260 corrects the recommended driving air pressure by considering both the temperature rise inside the tire and the atmospheric pressure change due to the altitude change, and checks (checks) the tire air pressure based on the corrected recommended driving air pressure. Select the second tire air pressure monitoring logic to be used.

The processor 260 performs tire air pressure monitoring according to the selected logic (S30). The processor 260 measures the air pressure of each tire through the air pressure sensor 120 of the measurement device 100 and checks whether the measured air pressure of each tire is equal to or less than the low pressure warning standard air pressure based on the reference air pressure. The processor 260 outputs a low pressure warning when the measured air pressure of each tire is equal to or less than the low pressure warning standard air pressure.

FIG. 4 is an embodiment illustrating a tire air pressure monitoring process shown in FIG. 3 .

Referring to FIG. 4 , the processor 260 of the monitoring device 200 measures the atmospheric pressure through the atmospheric pressure sensor 230 (S301).

The processor 260 calculates an atmospheric pressure change amount and a recommended air pressure according to the atmospheric pressure change using the measured atmospheric pressure (S302). The processor 260 calculates a change in atmospheric pressure, ie, a change in atmospheric pressure, measured based on the seaside standard atmospheric pressure. The processor 260 corrects the reference air pressure by reflecting the atmospheric pressure variation calculated in the standard recommended air pressure set as the default reference air pressure.

The processor 260 measures air pressure for each tire through the air pressure sensor 120 of the measuring device 100 (S303). The processor 150 of the measuring device 100 mounted on each tire of the vehicle measures the air pressure inside the tire through the air pressure sensor 120 and transmits the measured air pressure inside the tire through the transmitter 110. Processor 260 receives the air pressure inside the tire transmitted from measuring device 100 via receiver 210 .

The processor 260 checks whether the atmospheric pressure has changed based on the calculated atmospheric pressure change (S304). The processor 260 determines that there is no change in atmospheric pressure when the change in atmospheric pressure is 0, and determines that there is change in atmospheric pressure when the change in atmospheric pressure is not 0.

When there is no change in atmospheric pressure, the processor 260 determines whether a low pressure alarm is issued based on the standard recommended air pressure (S305). The processor 260 checks whether the measured air pressure for each tire is equal to or less than the low pressure warning standard air pressure based on the standard recommended air pressure, and determines whether to issue a low pressure warning based on the check result.

Meanwhile, when there is a change in atmospheric pressure, the processor 260 determines whether or not to warn of low pressure based on the recommended air pressure according to the change in atmospheric pressure (S306). The processor 260 checks whether the air pressure of each tire is in a low pressure state based on the corrected recommended air pressure by reflecting the change in atmospheric pressure.

The processor 260 corrects the measured air pressure of each tire by applying the atmospheric pressure change when determining whether or not the low pressure alarm is present.

The processor 260 displays the low pressure warning determination result on the display 250 (S307). Processor 260 displays condition information for each tire, low or normal. At this time, the processor 260 may also display the corrected tire air pressure.

FIG. 5 is another embodiment illustrating a tire air pressure monitoring process shown in FIG. 3 .

The processor 260 of the monitoring device 200 measures the atmospheric pressure outside the vehicle and the temperature inside the tire through the air pressure sensor 230 and the temperature sensor 130 of the measuring device 100 (S311). The measuring device 100 measures the internal temperature of the tire through the temperature sensor 130 and transmits the measured data through the transmitter 110 . Processor 260 receives the tire internal temperature transmitted from measuring device 100 via receiver 210 .

The processor 260 uses the measured atmospheric pressure and the tire internal temperature to calculate the atmospheric pressure change amount, the recommended operating air pressure according to the tire internal temperature change, and the recommended operating air pressure according to the tire internal temperature change and atmospheric pressure change (S312). The processor 260 calculates the change in atmospheric pressure and recommended operating air pressures using [Equation 1], [Equation 4], and [Equation 5].

The processor 260 measures the air pressure of each tire through the air pressure sensor 120 of the measuring device 100 (S313). The processor 260 measures the air pressure of the front left tire (P FL ), the air pressure _of the right front tire (P _FR ), and the rear right tire through the measuring device 100 mounted on the front left tire, the front right tire, the rear left tire, and the rear right tire, respectively. Measure the air pressure in the left tire (P _RL ) and the air pressure in the rear right tire (P _RR ).

The processor 260 checks whether the atmospheric pressure has changed based on the atmospheric pressure change (S314). The processor 260 determines that there is no change in atmospheric pressure when the change in atmospheric pressure is 0, and determines that there is change in atmospheric pressure when the change in atmospheric pressure is not 0.

When there is no change in atmospheric pressure, the processor 260 uses the recommended operating air pressure according to the change in the temperature inside the tire as a reference air pressure to determine whether or not to warn of low pressure (S315). The processor 260 checks whether the measured air pressure for each tire is equal to or less than the low pressure warning standard air pressure based on the standard air pressure, and determines whether or not to issue a low pressure warning according to the check result. At this time, the processor 260 corrects the measured air pressure for each tire by applying the atmospheric pressure change amount.

On the other hand, if there is a change in atmospheric pressure, the processor 260 determines whether or not to warn of a low pressure by using the recommended operating air pressure according to the change in the temperature inside the tire and the change in atmospheric pressure as the reference air pressure (S316). The processor 260 checks whether the measured air pressure for each tire is equal to or less than the low pressure warning standard air pressure based on the standard air pressure, and determines whether or not to issue a low pressure warning according to the check result.

Processor 260 displays the result of the determination on display 250 . Processor 260 displays condition information for each tire, low or normal. At this time, the processor 260 may also display the corrected tire air pressure.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: measuring device
110: transmitter
120: air pressure sensor
130: temperature sensor
140, 240: memory
150, 260: handler
200: monitoring device
210: receiver
220: GPS receiver
230: air pressure sensor
250: display

Claims (15)

A receiver for receiving air pressure for each tire measured by a tire air pressure measuring device mounted on each tire of the vehicle;
an air pressure sensor that measures atmospheric pressure outside the vehicle; and
A processor for correcting a reference air pressure based on the atmospheric pressure and determining whether or not a low pressure warning is issued for the measured air pressure for each tire based on the corrected reference air pressure,
The processor,
The tire air pressure monitoring device, characterized in that for measuring the internal temperature of the tire using a temperature sensor provided in the tire air pressure measuring device, and correcting the reference air pressure in consideration of a change in the measured internal temperature of the tire.
According to claim 1,
The processor,
The tire air pressure monitoring device according to claim 1 , wherein an atmospheric pressure change amount is calculated using the measured atmospheric pressure, and the reference air pressure is corrected in consideration of the calculated atmospheric pressure change amount.
delete According to claim 1,
The processor,
The tire air pressure monitoring device, characterized in that for correcting the reference air pressure in consideration of changes in the tire internal temperature and the atmospheric pressure.
According to claim 1,
The tire air pressure monitoring device,
Tire air pressure monitoring device further comprising a GPS receiver for measuring the current position of the vehicle.
According to claim 5,
The processor,
Tire air pressure monitoring device, characterized in that for selecting the tire air pressure monitoring logic according to the current position of the vehicle.
According to claim 2,
The tire air pressure monitoring device,
The tire air pressure monitoring device further comprises a display displaying a low pressure warning under control of the processor.
According to claim 7,
The processor,
The tire air pressure monitoring device characterized in that the measured air pressure for each tire is corrected by reflecting the atmospheric pressure change amount and displayed on the display.
measuring the atmospheric pressure outside the vehicle;
Correcting a reference air pressure based on the measured atmospheric pressure;
Measuring air pressure for each tire of the vehicle, and
Determining whether or not a low pressure warning is given for the measured air pressure for each tire based on the corrected reference air pressure;
The step of correcting the reference air pressure,
measuring the temperature inside the tire; and
and correcting the reference air pressure in consideration of a change in the internal temperature of the tire.
According to claim 9,
The step of correcting the reference air pressure,
calculating an atmospheric pressure change using the measured atmospheric pressure; and
and correcting the reference air pressure in consideration of the change in atmospheric pressure.
delete delete According to claim 9,
The step of correcting the reference air pressure,
The method of monitoring tire air pressure, characterized in that for correcting the reference air pressure in consideration of changes in the tire internal temperature and the atmospheric pressure.
According to claim 9,
Before measuring the atmospheric pressure,
measuring the current position of the vehicle; and
The method of monitoring tire air pressure, characterized in that it further comprises the step of selecting a tire air pressure monitoring logic based on the measured current position of the vehicle.
According to claim 9,
After the step of determining whether the low pressure warning is present,
The method for monitoring tire air pressure, characterized in that outputting a result of determining whether or not the low pressure warning is issued and correcting and outputting the measured air pressure for each tire by reflecting the change in atmospheric pressure.

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