KR20180029419A - System and Control Method For Tire Pressure Monitoring - Google Patents

Abstract

Disclosed is a tire pressure monitoring system. The system comprises: a tire pressure monitoring system (TPMS) sensor periodically measuring an outdoor temperature (Ta); and a TPMS control part checking a position change of a vehicle when an increment (ΔTa) of the outdoor temperature exceeds a predetermined range, calculating an air pressure warning notification value based on the temperature of a tire when the position change of the vehicle satisfies a predetermined condition, and calculating the air pressure warning notification value based on the outdoor temperature when the position change of the vehicle does not satisfy the predetermined condition. Therefore, device stability can be improved.

Description

Technical Field [0001] The present invention relates to a tire pressure monitoring system,

Embodiments relate to a tire pressure monitoring system and a control method thereof, in consideration of ambient temperature.

In accordance with the remarkable development of electronic control technology, various devices which are operated by a mechanical method in an automobile are driven by an electric method for reasons such as convenience of the driver and safety of operation, and automobile systems are gradually advanced and advanced It is going.

A tire pressure monitoring system mounted on a vehicle is called a tire pressure monitoring system (hereinafter referred to as TPMS). It detects a tire pressure and alerts the driver when the air pressure falls below a reference level.

The above-mentioned TPMS is FMVSS138 RULE (Federal Vehicle Safety Standard) of NHTSA (Federal Road Safety Agency), and vehicles exported to the US can be exported only if TPMS is installed in the vehicle. This is increasingly being applied now, and it is obligatory to mount 100% export vehicles in the future. The reason for this is that the tire pressure is reduced by 25% or less and the tire pressure is insufficient to continue the operation at high speed.

As we have already seen, technical research is underway to verify the operation of the TPMS as the TPMS installation rate is greatly increased.

Japanese Patent Application Laid-Open No. 10-2016-0072345 (published on June 23, 2016).

The embodiment is designed to overcome the above-mentioned limitations of the prior art, and one object of the present invention is to provide a tire pressure monitoring system that accurately measures tire air pressure irrespective of a change in ambient temperature.

It is another object of embodiments to provide a tire pressure monitoring system that provides an air pressure alert notification based on accurately measured air pressure.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The tire pressure monitoring system according to an embodiment includes a TPMS (Tire Pressure Monitoring System) sensor for periodically measuring an outside air temperature Ta; And an air pressure warning notification value based on the temperature of the tire when the change in the position of the vehicle satisfies a predetermined condition, And a TPMS control unit for calculating an air pressure warning notification value based on the outside air temperature when the positional change of the vehicle does not satisfy the predetermined condition.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

According to the embodiment, there are the following advantages.

First, a tire pressure monitoring system that accurately measures the tire air pressure regardless of changes in the outside air temperature is provided, so that vehicle stability can be improved.

Second, a tire pressure monitoring system that provides an air pressure warning notification based on accurately measured air pressure can be provided, which can improve vehicle stability and user convenience.

Third, a TPMS that accurately measures the tire air pressure is provided, so that the malfunction of the air pressure warning notification can be solved.

Fourth, since the embodiment can be implemented by changing the software in the conventional vehicle configuration, the implementation cost can be reduced.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a diagram showing an in-vehicle deployed tire pressure monitoring system (TPMS) according to an embodiment.
FIG. 2 is a block diagram illustrating a structure in which the TPMS shown in FIG. 1 is communicatively coupled with various components in a vehicle. FIG.
3 is a graph showing the relationship between the air pressure warning alert value and the temperature according to the embodiment.
4 and 5 are flowcharts showing a control method of the TPMS in consideration of the outside air temperature Ta according to the embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Lower) " and " front or rear " encompass both that the two components are in direct contact with each other or that one or more other components are disposed between the two components.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

1 is a diagram showing an in-vehicle deployed tire pressure monitoring system (TPMS) according to an embodiment.

The TPMS may include a TPMS sensor 11 and a TPMS control 12.

The TPMS sensor 11 is generally disposed on the tire wheel, but the embodiment is not limited thereto. The TPMS sensor 11 may be disposed in each of the tires.

The TPMS control unit 12 includes a receiver for receiving a signal received from the TPMS sensor 11, and can be mounted in a specific area of the vehicle.

FIG. 2 is a block diagram illustrating a structure in which the TPMS shown in FIG. 1 is communicatively coupled with various components in a vehicle. FIG.

The TPMS sensor 110 may check the tire air pressure and transmit the checked air pressure information to the TPMS control unit 120. [ At this time, the air pressure information can be transmitted at a frequency of 316 MHz, but the embodiment is not limited to this.

The TPMS sensor 110 can periodically measure the outside air temperature Ta. The TPMS sensor 110 may check the tire air pressure in units of msec after the start-up of the vehicle, but the embodiment is not limited thereto.

In addition, the TPMS sensor 110 can measure the outside air temperature Ta under the control of the TPMS controller 120. [

The TPMS sensor 110 may be driven when the ignition is turned on, and may be driven by an external LF initiator, a smart key or a remote controller, but the embodiment is not limited thereto.

The TPMS control unit 120 may receive the air pressure information received from the TPMS sensor 110 and determine whether to transmit the warning notification to the ECU including the head unit of the vehicle.

The TPMS control unit 120 may collect more data to determine whether to send an alert notification.

The TPMS control unit 120 can confirm the change in the position of the vehicle when the increment? TA of the outside air temperature Ta exceeds the predetermined range.

It can be assumed that the predetermined range of the increment (Ta) of the outside air temperature (Ta) is, for example, a case where the vehicle is moved from the underground parking lot to the ground in winter and the outside air temperature (Ta) , And when the vehicle is moved from the ground to the underground parking lot, when the outside air temperature (Ta) rises sharply, it may be assumed that it exceeds the predetermined range, but the embodiment is not limited thereto.

The TPMS control unit 120 may calculate the air pressure warning notification value based on the temperature of the tire when the positional change of the vehicle satisfies a predetermined condition. The air pressure warning alert reference value can be expressed as Pwarm, and it can be understood that the pressure of the tire in a state where the tire is normally heated.

The TPMS control unit 120 may calculate the air pressure warning notification value based on the temperature of the tire when the positional change of the vehicle does not satisfy the predetermined condition. A more detailed description will be described later, and will not be described here.

The system 200 for the location information of the vehicle can determine the location of the vehicle, provide it to the TPMS 100, and display various information on the display 210. The system 200 for location information of a vehicle may include an AVN system, but embodiments are not limited in this regard.

The system 200 for location information of a vehicle may include a position receiving unit 220 and a display 210.

The position receiving unit 220 can receive the position information of the vehicle through the satellite. The position receiving unit 220 can determine the position of the vehicle in consideration of GPS information, indoor GPS information, vehicle driving pattern, and the like.

The display 210 may display various contents. In particular, the display 210 may notify the driver, passenger, etc. of the air pressure warning notice.

In addition, the system 200 for providing vehicle position information may provide a guide to cope with a tire air pressure warning when providing an air pressure warning notice to a vehicle user, and may provide a vehicle user with the nearest tire check point during operation can do. Thus, user convenience can be further improved.

The TPMS control unit 120 and the system 200 for vehicle position information can provide a tire air pressure warning message to a smartphone (not shown) or a telematics center (not shown) of the vehicle user. Accordingly, it is possible to cope with the tire air pressure warning in a multifaceted manner.

The air conditioning system 300 can measure the outside air temperature and provide it to the TPMS 100, and can drive the in-vehicle air conditioner / heater. In particular, the air conditioning system 300 can measure the outdoor temperature at predetermined intervals according to the request of the TPMS 100.

The illuminance sensor 400 is a sensor that can determine whether the vehicle is indoors / outdoors, and is a sensor that helps determine the position of the vehicle. The illuminance sensor 400 can determine whether the vehicle is inside or outside according to time, and provide the brightness to the TPMS 100.

The photographing unit 500 is a module capable of photographing the inside / outside of the vehicle, and can be used as a module for determining the position of the vehicle. The photographing unit 500 may store the moving line of the vehicle in advance to photograph where the present location is and provide the photographing information to the system 100 for the location information of the vehicle.

The TPMS control unit 120 may control at least one of the system 200, the illuminance sensor 400, and the photographing unit 500 for the positional information of the vehicle to confirm a change in the position of the vehicle.

3 is a graph showing the relationship between the air pressure warning alert value and the temperature.

First, the TAmbient on the X axis represents the outside air temperature (Ta). The TAmbient can be measured and provided by the air conditioning system 300 as a TPMS. The TAmbient may be subject to an abruptly changing interval depending on the location of the vehicle. For example, if the vehicle leaves the underground parking lot in the underground parking lot during the winter, the TAmbient can be drastically lowered. Then, as shown in the graph, the Pwarm value is also lowered, so that an air pressure warning notice may be generated due to the low pressure.

Ttire can be a constant value regardless of whether the vehicle is indoors or outdoors since it is the temperature after the tire wheel has been rotated for a certain period of time whether the vehicle is in the room or outdoors.

The Pwarm on the Y axis is a factor that determines the air pressure warning notification. If Pwarm falls within a predetermined numerical range, the TPMS can transmit an air pressure warning notification.

PRec represents the pressure of the reference.

Referring to the graph, if the value of the TAmbient changes according to the position of the vehicle according to the parking environment, the value of Pwarm can not be changed. Because the Pwarm value is larger, the TPMS will send an air pressure warning notification even when it is not necessary to send an air pressure warning notification.

Therefore, when calculating the Pwarm in a section where the change in outside temperature (or difference between Ttire and Tambient) is large, TPMS can transmit accurate air pressure warning message using Ttire instead of TAmbient.

4 and 5 are flowcharts showing a control method of the TPMS in consideration of the outside air temperature Ta according to the embodiment.

First, the TPMS 100 periodically measures the vehicle position (S410). The TPMS 100 periodically measures the Tambient (S420). Steps S410 and S420 may be performed in a mutually different manner.

The TPMS 100 can track the change in the position of the vehicle using at least one of the system 200, the illuminance sensor 400, and the photographing unit 500 for the position information of the vehicle.

The TPMS 100 determines whether the vehicle has moved from the room to the outside or from outside to inside (S440) if? Ta is within the predetermined range (S430).

Moving from outside to inside outdoors can be calculated as the interval between Ttire and Ta.

The TPMS 100 calculates Pwarm as a Ttire value when an indoor / outdoor change occurs. Pwarm can be derived by the following equation.

Here, RCPx can be 32 psi at the pressure of the reference, but the embodiment is not limited to this. Pbarom represents atmospheric pressure. That is, Pwarm can be the pressure of RCPx.

The TPMS 100 calculates Pwarm using the Ta value when the indoor / outdoor change does not occur. Pwarm can be derived by the following equation.

5, steps S410 and S420 are the same as those in Fig.

However, the TPMS 100 can use a predetermined timer. When the TPMS 100 sets the timer to N seconds and calculates the Pwarm using the Ttire (S550), the TPMS 100 determines that the timer has expired.

The timer is a factor necessary for the TMPS 100 to periodically measure the outside air temperature (Ta), the tire temperature (Ttire), and the like.

The TPMS 100 determines whether the vehicle has moved from the indoor to the outdoor or from the outdoor to the indoor (S440) if the predetermined timer has remaining time and ΔTa is within the predetermined range (S430).

If the indoor / outdoor change occurs, the TPMS 100 calculates Pwarm by referring to Equation (1) in FIG. 4, and if the indoor / outdoor change does not occur, the Pwarm can be calculated using the Ta value.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage system, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

Claims (14)

A TPMS (Tire Pressure Monitoring System) sensor for periodically measuring the outside air temperature Ta; And
When the increment (? Ta) of the outside air temperature exceeds a predetermined range, a change in the position of the vehicle is confirmed,
Calculating an air pressure warning notification value based on the temperature of the tire when the positional change of the vehicle satisfies a predetermined condition,
And a TPMS control unit for calculating an air pressure warning notification value based on the outside air temperature when the positional change of the vehicle does not satisfy the predetermined condition. The method according to claim 1,
The TPMS control unit,
And confirms a change in the position of the vehicle based on the positional information of the vehicle received from the system for the positional information of the vehicle. 3. The method of claim 2,
The TPMS control unit,
Wherein the change in the position of the vehicle is confirmed through the illuminance sensor or the photographing section mounted on the vehicle. The method according to claim 1,
The predetermined condition is that,
A condition that the outside temperature and the tire temperature have a predetermined difference or a condition that the vehicle is moved outdoors from the room. The method according to claim 1,
The TPMS control unit,
And controls the system for the position information of the vehicle to display an air pressure warning notification when the calculated air pressure warning notification value falls within a predetermined numerical range. The method according to claim 1,
The TPMS control unit,
And controls the TPMS sensor to periodically measure the outside air temperature through an air conditioning system. The method according to claim 1,
The TPMS control unit,
When the positional change of the vehicle satisfies a predetermined condition, calculates a tire warning notification pressure value Pwarm not considering the outside air temperature,
And calculates a tire warning notification pressure value (Pwarm) in consideration of the outside air temperature, the atmospheric pressure, and the reference air pressure when the positional change of the vehicle does not satisfy the predetermined condition. Periodically measuring an outside air temperature (Ta);
Confirming a change in the position of the vehicle when the increment ΔTa of the outside temperature exceeds a predetermined range;
Calculating an air pressure warning alert value based on the temperature of the tire when the positional change of the vehicle satisfies a predetermined condition; And
And calculating an air pressure warning alert value based on the outside air temperature when the positional change of the vehicle does not satisfy the predetermined condition. 9. The method of claim 8,
The step of confirming the change in the position of the vehicle includes:
And confirming a change in the position of the vehicle based on the positional information of the vehicle received from the system for the positional information of the vehicle. 10. The method of claim 9,
The step of ascertaining the position of the vehicle comprises:
And confirming a change in the position of the vehicle through an illuminance sensor or a photographing unit mounted on the vehicle. 9. The method of claim 8,
The predetermined condition is that,
And a condition that the temperature difference between the outside air temperature and the tire temperature is a predetermined value or a condition in which the vehicle is moved outdoors in the room. 9. The method of claim 8,
And controlling the system for position information of the vehicle to display an air pressure warning notification when the calculated air pressure warning notification value falls within a predetermined numerical range. 9. The method of claim 8,
Wherein the measuring step comprises:
A method of controlling a tire pressure monitoring system for periodically measuring the outside air temperature through an air conditioning system. 9. The method of claim 8,
Wherein the calculating step comprises:
When the positional change of the vehicle satisfies a predetermined condition, calculates a tire warning notification pressure value Pwarm not considering the outside air temperature,
And calculates a tire warning notification pressure value (Pwarm) in consideration of the outside air temperature, the atmospheric pressure, and the reference air pressure when the positional change of the vehicle does not satisfy the predetermined condition.

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