Monitoring system of the inner state of tires and a method for operating the system

• US 20070144639A1
• Filed: 02/27/2004
• Published: 06/28/2007
• Est. Priority Date: 02/27/2003
• Status: Abandoned Application

• Current Assignee: Mi-Kyung Oh
• Original Assignee: Mi-Kyung Oh
• Inventors: Oh, Mi-Kyung
• Application Number:
  US10/546,852
• Publication Number:
  US 20070144639A1
• Time in Patent Office: Days
• US Class Current: 152/152.100
• CPC Class Codes: B60C 23/0401 characterised by the type of alarm
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol
• CPC Class Codes: B60C 23/0481 System diagnostic, e.g. monitoring battery voltage, detecting hardware detachments or identifying wireless transmission failures

Abstract

A casing device for installing a TPMS wireless transmitter in a wheel of an automobile'"'"'s tire has a lower case and an upper case, wherein the lower case adheres to the outer surface of the wheel and has the same curved surface as the wheel and the upper case includes the wireless transmitter in itself and combines with the lower case and adheres to it. And in a method for transmitting wireless data a transmitter checks predetermined data transmitting conditions before transmitting wireless data to a receiver and transmits data by using TDMA method if the data transmitting condition is satisfied, or else by using CDMA method.

Claims

1. A casing device of a transmitter for a Tire Pressure Monitoring System (TPMS) of an automobile, said device for installing a direct-type TPMS wireless transmitter in a wheel, wherein said device comprises a lower case and an upper case, and said lower case adheres to the outer surface of said wheel by a strong both-sided adhesive agent and has the same curved surface as said wheel and said upper case combines with said lower case and adheres to said lower case.

2. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 1, wherein said lower case comprises:

a thermal-transmission path transmitting inner heat of said upper case to the surface of said wheel rapidly;

a pair of female-concave which is a space having a trapezoid-shape section placed in either side of said thermal-transmission path respectively,

a female-rack placed in another side of said thermal-transmission path,

a combining groove which has predetermined size and depth, formed in a predetermined place of said female-rack; and

contact portion which has predetermined radius of curvature for said female-rack'"'"'s easy bending when force is applied to said female-rack in the upper direction, placed in a connecting part between said female-rack and said lower case.

3. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 2, wherein said upper case comprises:

a male-rack placed on one surface of said upper case and having a risen part of “

”

shape in the inner of said upper case;

male-risen parts placed in both of left and right side of said lower part of said upper case and having a section of trapezoid shape and a size corresponding with said female-concave; and

a space formed between said male-risen parts

4. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 3, wherein said female-concaves'"'"' section has trapezoid-shape, one side of said female-concaves has open state and the other side has close state in order to prevent said male-risen parts adhered firmly to said upper case from separation and said upper face of said female-concaves has open state and the lower face has close state.

5. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 4, wherein in order to adhere said upper case including a wireless transmission device to said lower case, said male-risen parts of said upper case is settled to adjust the entrance of said female-concaves of said lower case and then said male-risen part is pushed according to the guidance of said groove of said female-concaves in the direction from front-open side of said female-concaves to the opposite-closed side for firm adherence and then said female-rack is bent toward the upper direction until said combining groove is caught by said male-rack and in order to separate said upper case from said lower case, force is given to said female-rack for getting out said combining groove from said male-rack and then said upper case is pushed in the direction of forward from rear side to separate from said upper case.

6. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 1, wherein said upper and lower case are made of plastic having low thermal conductivity, in order not to transmit said tire'"'"'s inner heat to a wireless transmitter placed in said upper case.

7. A casing device of a transmitter for a TPMS of an automobile as set forth in claim 1, wherein in order to insert said wireless transmitter into said upper case, into a PCB guide which guides PCBs for said wireless transmitter said PCB is inserted and pushed and then said PCB is adhered to said guide firmly.

8. A casing device of a transmitter for a Tire Pressure Monitoring System of an automobile, said casing device for installing a direct-type TPMS wireless transmitter in a wheel, wherein said case is separated into a male-case and a female-case and said male-case slips and goes into a space formed in said female-case by sliding method and finally said male-case is locked to said female-case.

9. A casing device of a transmitter for a Tire Pressure Monitoring System of an automobile, said device for installing a direct-type TPMS wireless transmitter in a wheel, comprising a thermal-transmission path located at a predetermined position of said case for transmitting inner heat of said case to the surface of said wheel easily.

10. A casing device of a transmitter for a Tire Pressure Monitoring System of an automobile, said casing device for installing a direct-type TPMS wireless transmitter in a wheel, comprising a wireless transmitter which adheres to outer surface of said wheel by a strong both-sided adhesive agent and is installed in a tire with a loaded state in said case.

11. A hybrid digital RF data transmitting method comprising the steps of:

a step for confirming predetermined data transmitting condition before a transmitter transmits RF data to a receiver;

a step for transmitting data by a TDMA (Time Division Multiple Access) type method if said predetermined data transmitting condition is satisfied by said confirming step; and

a step for transmitting data by a CDMA (Code Division Multiple Access) type method if said predetermined data transmitting condition is not satisfied by said confirming step.

12. A data transmitting method as set forth in claim 11, wherein said CDMA type method includes a CS-CDMA (code select CDMA) type method.

13. A data transmitting method as set forth in claim 11, wherein said predetermined data transmitting condition is that the data of a tire condition monitored by a Tire Pressure Monitoring System of an automobile satisfies a normal state.

14. A hybrid digital RF data transmitting method in order to check the inner state of tires of an automobile and to display warning signal, wherein an RF transmitter having a means for checking the inner state of a tire is attached to each tire and a receiver is attached to a predetermined position of the inside of an automobile in order to inform a driver the inner state of each tire and to display a warning message if necessary, wherein said hybrid digital RF data transmitting method comprising the steps of:

a step for starting the automobile driving;

a first determination step for determining whether said being driven automobile is in a supplying mode or in an isolating mode;

a step for stopping the operation of a transmitter if said being driven automobile is in an isolating mode after said determination;

a step for starting the operation of a transmitter if said being driven automobile is in a supplying mode after said determination;

a first checking step for checking the inner state of a tire after a transmitter begins to operate;

a step for RF transmitting of an initial state data to a receiver after entering said supplying mode;

a second determination step for determining the state of a tire at a constant interval of time;

a second checking step for checking with a basis of said determined state whether the state of a tire is a in a normal/attention state or a in a danger/emergency state in accordance with a specific reference;

a step for displaying a corresponding display information via a displaying device of a receiver in accordance with the result of said second determination; and

a step for checking whether an automobile is being driven or not and then executing said second determination step if said automobile is in a driving state or stopping said second determination step if not in a driving state.

15. A hybrid digital RF data transmitting method as set forth in claim 14, wherein a decreased level of a tire is divided into several stages on the basis of a declared pressure of a tire in order to define the tire state, and an emergency level is classified into the lowest pressure (LtP), a danger level is classified into the low pressure (LP), an attention level is classified into the upper pressure (UP) and a normal level is classified into the placard pressure (PP), and wherein actions to be taken in accordance with said classification comprise the steps of:

in the LtP, displaying a tire position (ID) and a warning massage by transmitting a warning data immediately or continuously;

in the LP, displaying a tire position (ID) and a warning massage by transmitting a warning data frequently;

in a driving state with a temporarily installed spare tire/wheel, supplying a signal for limiting the driving speed within a specific time to a power train;

in the UP, displaying a tire position (ID) and a state of the present pressure by transmitting a warning data intermittently;

in the PP, guaranteeing the lifetime of a battery by transmitting shortly only needed data in every long time interval;

regarding as the emergency level (LtP) if a tire pressure reduces to below 25% of said declared pressure or to the minimum driving pressure, and applying said state to assembled spare tire/wheel substituted for driving tires;

with the exception of parked cars, regarding as attention level (UP) if load tire pressure rapidly reduces in driving, and warning intermittently within a predetermined time just after exceeding the rapid reduction;

regarding as attention or danger level if air pressure of a load tire is higher than the declared pressure (PP) by a specific psi, and informing intermittently the present pressure state within a predetermined time; and

applying a spare tire/wheel installed in an automobile to the state level and then warning within a time being longer than a predetermined time.

16. A hybrid digital RF data transmitting method as set forth in claim 15, wherein said data is transmitted from a transmitter to a receiver by using a hybrid digital RF data transmission method, and said data transmission condition is that said measured pressure of a road tire is at a normal level or not, and said data transmission is executed by a TDMA type if said pressure is at a normal level, and said data transmission is executed by a CDMA type if said pressure is at an abnormal level.

17. A hybrid digital RF data transmitting method as set forth in claim 14, wherein the power of a transmitter is cut off if a driving speed is less than a specific speed.

18. A hybrid digital RF data transmitting method as set forth in claim 15, wherein a receiver transmits a tire position and information data for the PP or UP cases, and said receiver transmits a tire position and warning display data for the LP or LtP cases.

19. A hybrid digital RF data transmitting method as set forth in claim 14, wherein the data transmitted from a transmitter is modulated by a TDMA RF type method in a state loaded on the carrier wave, and the transmission data received from a MCU inside of a transmitter is transmitted through:

a step for preparing operation with small consumption current by a modulator;

a step for waiting locking because PLL is not yet locked although the PLL operates;

a step for waiting a first data after the PLL is locked; and

a step for transmitting data after data are loaded on the carrier signal (carrier wave) and modulated by the TDMA RF type method.

20. A hybrid digital RF data transmitting method as set forth in claim 14, wherein said step for receiving data by a receiver comprises:

a step for receiving data from an antenna and modulating by a TDMA RF modulator;

a step for synchronizing data by a synchronizing part;

a step for checking whether a correlation value is or not by a correlator;

a step for modulating the data by a CDMA type method if there is a correlation value after said checking and treating the data by an abnormal level data processor; and

a step for modulating the data by a TDMA type method if there is not a correlation value after said checking and treating the data by a normal level data processor.

21. A monitoring system of the inner state of tires for an automobile in order to measure the inner state of a driving tire and to display warning in emergency state, wherein said monitoring system comprises:

a number of RF transmitters installed to each tire; and

a receiver for receiving digital RF data for a tire state transmitted in constant time interval and installed in a predetermined place inside of an automobile, and

a transmitter transmitting data to a receiver by using said hybrid digital RF method.

22. A monitoring system as set forth in claim 21, wherein said transmitter comprises:

an antenna;

a battery for supplying direct current electric power;

a discrimination means of the inner state level of a tire for detecting the electric power of said battery, and measuring the temperature of the inner side of a tire, and measuring the, pressure of the inner side of a tire;

a motion switch for cutting off the electric power supplied from said battery to said transmitter in case the automobile is parked or being driven under the speed of a predetermined driving speed, and for supplying the electric power to said transmitter only when the automobile is being driven over the speed of a predetermined driving speed;

a micro-controller for controlling said battery and said each means; and

a TDMA RF modulator for receiving data from said micro-controller and for transmitting said data to said receiver by through said antenna.

23. A monitoring system as set forth in claim 21, wherein said receiver comprises:

a TDMA RF modulator for receiving data transmitted from a number of transmitters through said antenna and for modulating said received data;

a number of correlators for calculating a correlation value of data received from said TDMA RF modulator;

a discriminator for discriminating the existence of said calculated correlation value;

a CDMA modulator for modulating data in case of existing of said correlation value;

a TDMA modulator for modulating data in case of not existing of said correlation value;

a means for treating an abnormal level data modulated by said CDMA modulator;

a means for treating a normal level data modulated by said TDMA modulator;

a data output part for outputting said received data to the outside;

a non-volatile memory for storing a predetermined data;

a bar code inputting part for inputting bar code information of each tire;

a control button part for controlling data received from said transmitter to desirable information;

a means for generating warning in accordance with a predetermined warning condition;

a means for supplying electric power to each part of said receiver;

a timer chip for controlling time;

a display device for displaying the present inner state of a tire including a pressure, a temperature and a battery electric power in the form of number or character within a specific time set by a timer chip; and

a micro-controller for controlling each component of said receiver.

24. A monitoring system as set forth in claim 21, wherein said data frame comprises a Preamble Sync, a correlation pattern, an ID, a temperature, a pressure, a tire state data including said battery, a CRC and an EOF.

25. A monitoring system as set forth in claim 23, wherein connecting a bar code input port of said bar cord input means including a left button, a right button, a registration/deletion button, a spare button, a replacing button, said bar code input port, a data output port and a display device for displaying the information of a tire to a bar code reader, and reading bar cord ID locating outside of all tires installed to an automobile in a predetermined direction and in order, and then registering said read bar code ID to said receiver.

26. A monitoring system as set forth in claim 21, wherein said system displays only ID (tire position) with a long time interval to inform normal state in case of a normal level, and displays simultaneously an ID (tire position) and a warning data intermittently in case of being between the normal level and the attention level (UP), and displays an ID (tire position) and a warning data frequently in case of being between the attention level and the emergency level (LtP), and displays an ID (tire position) and a warning data continuously in case of being under the emergency level (LtP).

27. A monitoring system as set forth in claim 26, wherein said system detects error generated in the transmission by using the CRC sign in normal level, and discards all received error data.

28. A monitoring system as set forth in claim 21, wherein the determination of whether the data received from said receiver is in effect or not is executed by reading ID essentially allocated to each transmitter and ignoring an ID that is not controlled by said receiver.

29. A monitoring system as set forth in claim 21, wherein said transmission frame is divided into predetermined units of windows and transmitted in the form of burst type, and a frame is formed by receiving many windows and assembling them in order, and each window selects one orthogonal code from a CS block consisting of predetermined number of orthogonal codes by using an information bits and repeats said step for selecting one orthogonal code from a CS block consisting of predetermined number of another orthogonal codes by using another information bits to a predetermined time, and loading data by logically multiplying each selected orthogonal code by an information bit.

30. A monitoring system as set forth in claim 21, wherein said receiver further comprises a synchronizing pattern to improve efficiency.

31. A monitoring system as set forth in claim 22, wherein said a first micro controller comprises a buffer and an inner Flash, and said Flash comprises a discrimination means of the inner state level of a tire, a TDMA modulator and a CDMA modulator that are implemented by a software.