KR100783958B1 - Spare tire detection warning method of TPMS system - Google Patents

Abstract

The present invention relates to a spare tire detection warning method of the TPMS system.

That is, the present invention includes a first step of detecting the internal temperature (Tb) of the operating tire at the time of initial driving; A second step of detecting an internal temperature Ta of the operating tire after a predetermined time after the driving; A third step of calculating a temperature change amount (ΔT = Ta-Tb) of each working tire in a receiver having received the temperatures Ta and Tb; When the temperature change amount ΔT is equal to or greater than the reference value Ts, the operating tire is determined to be in a rolling state. When the temperature change amount ΔT is equal to or less than the reference value Ts, the operation tire is determined to be in a spare tire storage position. It is an object of the present invention to provide a spare tire detection warning method of a TPMS system, comprising a fourth step of warning of the TPMS system.

Description

Spare tire detection warning method of TPMS system {Method for monitoring spare tire in the TPMS}

1 is a flowchart illustrating a spare tire detection warning method of a TPMS system according to the present invention;

2 is a flowchart illustrating a spare tire detection warning method of a conventional TPMS system;

3 is a structural diagram illustrating a configuration of a TPMS system.

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

10: pressure sensor 20: receiver

30: initiator 40: display device

The present invention relates to a spare tire detection warning method of the TPMS system, and more particularly, when the vehicle's operating tire (with a pressure sensor) is replaced with a spare tire (without a pressure sensor), each operating tire at the time of initial driving. Detects the internal temperature and the internal temperature of each operating tire after a certain time after driving, and if the temperature change amount (difference) is more than the reference value, the operating tire is judged to be in a rolling state, and conversely, the internal temperature change amount of each operating tire is the reference value. In the following case, it is determined that the tire is in the spare tire storage position and the spare tire detection warning method of the TPMS system to ensure that the warning of the TPMS system.

If the tire pressure of the vehicle is too high or too low, the tire may be flat or the vehicle may slip easily, leading to a large accident, fuel consumption may be increased, fuel economy may deteriorate, tire life may be shortened, Braking power also drops a lot.

A safety device mounted on the vehicle to prevent such a tire defect is a tire pressure warning device (hereinafter referred to as TPMS).

As is well known, the tire pressure monitoring system (TPMS) is also referred to as an automatic tire air pressure detection system, a tire pressure detection system, a tire pressure monitoring system, and an automatic sensor attached to a tire always provides an appropriate air pressure and temperature for the tire. It is a device that improves tire durability, ride comfort and braking power by detecting

That is, the TPMS is a system designed to detect the pressure and temperature of the tire with a RFID sensor attached to the tire, and then send this information to the driver's seat to allow the driver to check the tire pressure in real time. This system not only improves tire durability, ride comfort and braking power, but also improves fuel economy and prevents the vehicle body from shaking violently while driving.

Recently, various countermeasures have been proposed to respond to TPMS-related regulations, and in particular, spare tires and replacement tires without pressure and temperature sensors for TPMS are replaced with actual tires and the pressure due to TPMS. Various techniques have been proposed to satisfy the legislation that warning lamps of TPMS systems must be turned on in case of failure warning.

In general, spare tires and replacement tires are not equipped with a pressure sensor, so a TPMS system warning should be given when the driver exchanges a working tire (with a pressure sensor) and a spare tire (without a pressure sensor).

However, when the spare tire and the replacement tire are mounted on the vehicle and the operating tires on the vehicle are mounted in the spare tire storage position, the operating tires also operate in the storage position of the spare tire, so that the TPMS system is applied to four operating tires. An error occurs that determines that all of the mounted pressure sensors operate normally. In this case, a warning operation of the TPMS system is not performed properly.

In view of these problems, the TPMS system currently under development detects that one or more of the four operating tires are in the spare tire storage position, and determines that the spare tires and replacement tires are mounted in the actual vehicle operating mode. It is a system that turns on the warning light of the TPMS system.

To implement this logic, it is essential to detect whether the operating tire is in a rolling state or in a spare tire storage position.

2 is a flowchart illustrating a spare tire detection warning method of a conventional TPMS system.

Referring to FIG. 2, the conventional method includes an acceleration sensor in the tire pressure sensor, and when the tire rotates more than a predetermined speed, the acceleration sensor detects this and transmits a flag signal to the TPMS receiver, and the TPMS system The side proceeds to the step of determining whether the tire is rolling (Rolling) by receiving this.

However, since the accuracy of the acceleration sensor is poor and the vehicle speed must be 20 KPH or more in a bad condition, a flag signal can be transmitted to the TPMS receiving end, so that the tire is in a rolling state during continuous driving in a low speed section (20 KPH or less). It is difficult to determine whether or not it is recognized, and thus, there is a limit that the TPMS system warning cannot be issued when the spare tire or the replacement tire is mounted in the actual vehicle operating mode.

To improve this, there is a need for a sensor with a low tolerance to the vehicle speed and a sensor insensitive to the tire internal temperature, which has a disadvantage of excessive cost and current consumption (high battery loss), and a potential error. There is a difficulty in the actual application.

On the other hand, the acceleration sensor used in the TPMS transmits the flag signal as "1" when a motion of a certain acceleration or more is detected.

However, the accelerometer used today can vary by more than 10G depending on the tire internal temperature, and it is about 20kph when the reference acceleration at room temperature is converted to the vehicle speed, and about 20kph in the worst condition. It can make a difference.

As a result, when the reference speed value is lower than the current 20kph, the actual vehicle moves, but the acceleration sensor may determine that the vehicle is stationary, and thus, the reference speed value should be 20kph or more.

In order to improve this, an acceleration sensor (G-Sensor) having a small sensitivity limit according to temperature or a sensor capable of monitoring a continuous acceleration value should be used, which causes excessive cost increase and is difficult to apply in practice. .

The present invention has been conducted in view of the above points, and the present invention detects the operating tire internal temperature at the time of initial driving and the operating tire internal temperature at a certain time after driving, and the temperature change amount (difference) is more than the reference value. If the operating tire is determined to be in a rolling state, on the contrary, if the internal temperature change of each operating tire is less than the reference value, the operating tire is determined to be in a spare tire storage position, so that the spare tire of the TPMS system can be correctly made. Its purpose is to provide a detection warning method.

The present invention for achieving the above object is a first step of detecting the internal temperature (Tb) of the operating tire at the time of initial driving; A second step of detecting an internal temperature Ta of the operating tire after a predetermined time after the driving; A third step of calculating a temperature change amount (ΔT = Ta-Tb) of each working tire in a receiver having received the temperatures Ta and Tb; When the temperature change amount ΔT is equal to or greater than the reference value Ts, the operating tire is determined to be in a rolling state. When the temperature change amount ΔT is equal to or less than the reference value Ts, the operation tire is determined to be in a spare tire storage position. It provides a spare tire detection warning method of the TPMS system comprising a fourth step of the warning of the TPMS system.

In a preferred embodiment, if the acceleration flag of the operating tire is turned on by driving at least 20 KPH after the vehicle starts to travel, the first, second, third, and fourth steps do not proceed, and the acceleration flag signal Is transmitted to the receiver and at the same time, the receiver determines whether the rolling state of each tire is performed.

In a more preferred embodiment, the first, second, third and fourth steps may include the acceleration of the operating tire traveling at a speed of 20 KPH or less (low speed) for 20 minutes or repeatedly changing to 20 KPH or less for 20 minutes repeatedly. In addition, the acceleration flag is characterized in that it proceeds when the OFF state is maintained continuously.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to the attached FIG. 3, the configuration of the TPMS system will be briefly described. A pressure sensor 10 installed in a working tire that refers to four tires of a vehicle may detect pressure, temperature, and acceleration of a tire; A receiver (20) for receiving RF signals detected by the pressure sensor (10) and performing control and warning logic operations; An initiator (30) to issue a command to one of the devices at the interface between the pressure sensor (10) and the receiver (20) to execute an operation; The display device 40 is configured to warn the position of the warning light and the low pressure tire by the warning logic command signal of the receiver 20.

Conventional TPMS system warning based on this configuration has occurred when the operating tire is replaced with the spare tire, the operating tire in the spare tire storage position is recognized as a normal rolling state, the warning can not be generated.

Thus, the present invention has a main point to be able to accurately determine whether the operating tire is rolling by using a physical phenomenon that the temperature increases when the internal temperature of the sealed tire is running at a certain speed or more, and to warn. .

The tire pressure sensor currently used in TPMS is a sensor that collects not only tire pressure but also acceleration to determine whether it is rolling and a temperature sensor to measure the internal temperature of the tire. This tire pressure sensor senses that the tire pressure is the internal temperature of the tire. It is used as important data to compensate for the phenomenon of increase and decrease with change.

The internal temperature of the tire is increased when the vehicle is driven, which means that all four operating tires have a similar variation with the temperature at the initial stop, while the internal temperature of the spare tire in the spare tire storage position is almost unchanged.

The present invention is to further detect whether the tire is actually rolling by detecting the amount of temperature change in the tire to be able to detect a more reliable rolling state of the tire with the verification method by the existing acceleration sensor.

Here, the spare tire detection warning method of the TPMS system according to the present invention will be described in order.

1 is a flowchart illustrating a spare tire detection warning method of a TPMS system according to the present invention.

First, as the step of detecting the internal temperature (Tb) of the operation tire at the time of the first driving of the vehicle, the internal temperature is detected by the built-in pressure sensor of the tire and transmitted to the receiver.

Next, 20 minutes after the vehicle is driven, the pressure sensor detects the internal tire Ta of the operating tire and transmits the same to the receiver.

Subsequently, the receiver receives the temperatures Ta and Tb to calculate the temperature change amount ΔT = Ta-Tb of each working tire.

Subsequently, when the temperature change amount ΔT is greater than or equal to a reference value (Ts: a value set for each vehicle type) in the receiver, the operating tire is determined to be in a rolling state, and when the temperature change amount ΔT is less than or equal to the reference value Ts, the corresponding operation tire The logic operation determines that is in the spare tire storage position.

Therefore, when the temperature change amount ΔT is less than or equal to the reference value Ts and the operating tire is determined to be in the spare tire storage position, the receiver sends a signal to the display device to warn the TPMS system of turning on the warning light. Is done.

The spare tire detection warning method by detecting the tire temperature change amount is such that the acceleration of the operating tire is driven at a speed (low speed) of 20 KPH or less for 20 minutes or repeatedly changes to 20 KPH or less and the acceleration flag is turned off. It is preferable to proceed when the state is kept (OFF).

That is, after the vehicle starts to drive, the vehicle may drive at a speed (low speed) of 20 KPH or less for a predetermined time (20 minutes: the law requires a warning within 20 minutes), or the vehicle speed may repeatedly be higher than or equal to 20 KPH for a predetermined time (20 minutes). If the acceleration flag changes to the OFF state, the amount of temperature change in the tire is checked at this time.

On the other hand, if the acceleration flag of the operating tire is turned on by driving 20KPH or more after starting the vehicle, the spare tire detection warning method by detecting the tire temperature change amount does not proceed, and the acceleration flag At the same time as the signal is transmitted to the receiver, the step of determining whether the tire is in a rolling state for each tire is performed as it is.

As such, by calculating the temperature change amount of the working tire by the pressure sensor of the tire, whether the working tire is actually rolled or replaced with a spare tire, an accurate warning of the TPMS system can be made.

As described above, according to the spare tire detection warning method of the TPMS system according to the present invention, the internal temperature of each operating tire at the time of the first driving and the internal temperature of each operating tire after a predetermined time after the driving are detected and the temperature is detected. If the change amount (difference) is greater than or equal to the reference value, the operating tire is judged to be in a rolling state, and if the internal temperature change amount of each operating tire is less than or equal to the reference value, the tire is determined to be in a spare tire storage position, and the warning of the TPMS system is precisely performed. Provide advantages.

That is, in addition to the verification method using the existing acceleration sensor, the method of detecting the temperature change in the tire can be additionally verified whether the actual operating tire is rolled, so that the spare tire is replaced with a rolling tire to monitor the normal pressure drop of the spare tire. Failure to do so can result in accurate warnings of the TPMS system, which not only responds to recent TPMS legislation, but also promotes the safety of the driver and passengers of the vehicle.

Claims (3)

A first step of detecting an internal temperature Tb of the operating tire at the time of initial driving; A second step of detecting an internal temperature Ta of the operating tire after a predetermined time after the driving; A third step of calculating a temperature change amount (ΔT = Ta-Tb) of each working tire in a receiver having received the temperatures Ta and Tb; When the temperature change amount ΔT is equal to or greater than the reference value Ts, the operating tire is determined to be in a rolling state. When the temperature change amount ΔT is equal to or less than the reference value Ts, the operation tire is determined to be in a spare tire storage position. And a fourth step of warning the TPMS system. The method of claim 1, wherein if the acceleration flag of the operating tire is turned on by driving at least 20 KPH after the vehicle starts running, the first, second, third, and fourth steps do not proceed, and the acceleration flag signal Determining whether the tire is in a rolling state at the same time as the receiver is transmitted to the receiver, and the spare tire detection warning method of the TPMS system according to claim 1, wherein the tire is transmitted to the receiver. The method of claim 1 or 2, wherein the first, second, third and fourth stages of the driving tire acceleration is 20 kph or less for 20 minutes (low speed), or 20 kph repeatedly for 20 minutes or less repeatedly And when the acceleration flag continues to be in an OFF state, the spare tire detection warning method of the TPMS system.

Images