CN109591523B - Tire pressure detection device and tire pressure detection method - Google Patents
Tire pressure detection device and tire pressure detection method Download PDFInfo
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- CN109591523B CN109591523B CN201710915994.3A CN201710915994A CN109591523B CN 109591523 B CN109591523 B CN 109591523B CN 201710915994 A CN201710915994 A CN 201710915994A CN 109591523 B CN109591523 B CN 109591523B
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- tire pressure
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- tire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0425—Means comprising permanent magnets, e.g. Hall-effect or Reed-switches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/045—Means for detecting electromagnetic field changes being not part of the signal transmission per se, e.g. strength, direction, propagation or masking
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- Mechanical Engineering (AREA)
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- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a tire pressure detection device, which comprises a closed shell, a differential pressure actuator, a first Hall sensor and a controller, wherein the inner cavity of the closed shell is communicated with the inner cavity of a tire; the magnetic element is movably arranged relative to the closed shell and can move when the air pressure of the inner cavity of the closed shell changes to change the detection distance from the magnetic element to the first Hall sensor, and an external tire pressure detection device is adopted to replace a detection device arranged in the inner cavity of the tire, so that the installation and maintenance are convenient, the inner cavity of the tire cannot be influenced, the safety is good, and the accuracy is high; the invention also provides a tire pressure detection method, which comprises the steps of preparation, starting and detection; the invention also provides a tire pressure detection method which comprises the steps of preparation, starting, signal acquisition and signal processing, and is accurate in detection, convenient and practical.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a tire pressure detection device and a tire pressure detection method.
Background
With the improvement of living standard of people, vehicles have gradually become indispensable tools for people to work and live, and vehicle safety is the most basic requirement for vehicles, and is also the most concerned important aspect and the most difficult permanent topic for a long time.
The tire burst caused by overhigh tire pressure is one of the reasons influencing the safety of the vehicle, the air pressure of the tire is known and mastered in real time, a driver can find the abnormal condition of the tire in time, the tire burst phenomenon is avoided, and the safety risk is reduced.
The existing tire pressure detection device and method usually adopt the mode of implanting detection equipment in the inner cavity of the tire, the method not only needs to implant the detection equipment, is not easy to install and maintain the detection equipment, has poor operability, but also relates to the change of the inner cavity of the tire, the detection equipment can be loosened in the inner cavity of the tire and even fall off, and the danger coefficient is higher.
Disclosure of Invention
One of the objectives of the present invention is to provide a tire pressure detecting device, so as to solve the technical problems existing in the prior art that a tire pressure detecting device is not easy to install and maintain, and is not safe enough.
In order to achieve the purpose, the invention adopts the technical scheme that: the tire pressure detection device comprises a closed shell, a differential pressure sensor, a first Hall sensor and a controller, wherein an inner cavity of the closed shell is communicated with an inner cavity of a tire; the magnetic element is movably arranged relative to the closed shell and can move when the air pressure in the inner cavity of the closed shell changes so as to change the detection distance from the magnetic element to the first Hall sensor.
Furthermore, the differential pressure reactor also comprises a pressure piece which is flexibly and hermetically connected to the closed shell, and the magnetic element is fixedly arranged on the pressure piece.
Furthermore, a guide groove is formed in the closed shell, the pressure piece is connected to the wall of the guide groove in a flexible sealing mode, and the magnetic element is arranged in the guide groove in a sliding mode.
Furthermore, the differential pressure reactor also comprises a pressure balance component, one end of the pressure balance component is fixedly arranged on the closed shell, the other end of the pressure balance component is fixedly arranged on the pressure piece, and the pressure of the pressure balance component on the pressure piece and the pressure of the inner cavity air pressure of the closed shell on the pressure piece are kept in dynamic balance.
Furthermore, the pressure differential reactors are arranged in a plurality and distributed along a first circumference; and in the process that the closed shell rotates around an axis which is perpendicular to the first circumference and passes through the circle center of the first circumference, the magnetic element can pass through the induction range of the first Hall sensor.
Furthermore, the closed shell is a revolving body, and the differential pressure reactors are distributed along the circumferential direction of the closed shell.
Further, the width of each of the magnetic elements in the direction in which it rotates about the axis with the containment vessel is different.
Further, the detection distances from the magnetic elements to the first hall sensor are different.
The rotating speed sensor is used for detecting the rotating period of the closed shell and comprises a second Hall sensor and magnetic gear teeth; the magnetic gear teeth can pass through the sensing range of the second Hall sensor in the process that the magnetic gear teeth rotate around the axis, and the second Hall sensor is in communication connection with the controller.
Further, revolution speed sensor still includes the mounting bracket, the mounting bracket set firmly in on the airtight shell, the magnetism teeth of a cogwheel set firmly in on the mounting bracket.
Further, the device also comprises a display device which is in communication connection with the controller and/or an alarm device which is in communication connection with the controller.
The tire pressure detection device provided by the invention has the beneficial effects that: compared with the prior art, the first Hall sensor obtains a potential difference signal by sensing the magnetic element and transmits the potential difference signal to the controller, the controller judges the intensity of magnetic field sensed by the first Hall sensor according to the received potential difference signal, then the distance between the magnetic element and the first Hall sensor when the potential difference signal is detected is determined, and finally the air pressure of the sealed shell and the inner cavity of the tire is determined; the tire pressure detection device can be arranged outside a tire or exposed outside the tire, so that the detection device is prevented from being arranged in the inner cavity of the tire, the installation and the maintenance are convenient, the inner cavity of the tire is not influenced, and the safety is good; the inner cavity of the sealed shell is communicated with the inner cavity of the tire, which is equivalent to directly detecting the air pressure of the tire, and the accuracy is high.
The second purpose of the present invention is to provide a tire pressure detecting method, so as to solve the technical problems existing in the prior art that the tire pressure detecting device is not easy to install and maintain, and is not safe enough.
In order to achieve the purpose, the invention adopts the technical scheme that: the tire pressure detection method is provided, the tire pressure detection device comprises the following steps:
preparing: the tire pressure detection device is arranged on a vehicle, the pressure differential reactor, the closed shell and the first Hall sensor rotate synchronously with the wheel, and an inner cavity of the closed shell is communicated with an inner cavity of the tire;
starting: starting the tire pressure detection device;
and (3) detection: the first Hall sensor obtains a potential difference signal by sensing the magnetic element and feeds the potential difference signal back to the controller;
the controller obtains the tire pressure according to the received potential difference signal.
The tire pressure detection method provided by the invention has the beneficial effects that: compared with the prior art, the adopted tire pressure detection device is convenient to install and maintain, does not influence the inner cavity of the tire and has good safety compared with the detection device arranged in the inner cavity of the tire; the inner cavity of the sealed shell is communicated with the inner cavity of the tire, which is equivalent to directly detecting the air pressure of the tire, and the accuracy is high; the first Hall sensor senses the strength of the magnetic field of the magnetic element, the detection distance between the first Hall sensor and the magnetic element is obtained, and then the detection mode of the tire pressure is obtained.
The invention further aims to provide a tire pressure detection method to solve the technical problems that in the prior art, tire pressure detection equipment is not easy to install and maintain and is not safe enough.
In order to achieve the purpose, the invention adopts the technical scheme that: the tire pressure detection method is provided, the tire pressure detection device comprises the following steps:
preparing: the tire pressure detection device is arranged on a vehicle, the pressure differential reactor and the closed shell synchronously rotate with wheels, the first Hall sensor is fixed with the vehicle body, and the magnetic element can communicate the inner cavity of the closed shell with the inner cavity of a tire through the sensing range of the first Hall sensor in the process of rotating along with the closed shell;
starting: starting the tire pressure detection device;
signal acquisition: the first Hall sensor obtains a first pulse signal by sensing the magnetic element and feeds the first pulse signal back to the controller;
signal processing: the controller analyzes the tire pressure according to the received first pulse signal.
Furthermore, the pressure differential reactors are arranged in a plurality and distributed along a first circumference, and an axis which is perpendicular to the first circumference and passes through the circle center of the first circumference is coincided with the axis of the wheel; the widths of the magnetic elements in the direction rotating along with the closed shell are different, and the signal processing step further comprises the following steps:
the controller matches the magnetic element that generated each pulse in the received first pulse signal according to the width of that pulse.
Furthermore, the pressure differential reactors are arranged in a plurality and distributed along a first circumference, and an axis which is perpendicular to the first circumference and passes through the circle center of the first circumference is coincided with the axis of the wheel; the detection distances from the magnetic elements to the first hall sensor are different, and the signal processing step further includes:
the controller matches the magnetic element that generated each pulse in the received first pulse signal according to its height.
Further, still include rotational speed sensor, the signal acquisition step still includes:
the second Hall sensor obtains a second pulse signal by sensing the magnetic gear teeth and feeds the second pulse signal back to the controller;
the signal processing step further comprises:
and the controller obtains the rotation period of the closed shell according to the received second pulse signal, and judges whether the pulse signals of the magnetic elements are lost in each rotation period by combining the rotation period and the first pulse signal.
Further, the signal processing step further includes: the controller respectively obtains initial tire pressure according to the pulse signals of the magnetic elements in the first pulse signals, and obtains tire pressure by carrying out average processing on the initial tire pressure.
Further, the signal processing step further includes: the controller combines and processes the measured pulse signals of the magnetic elements in the first pulse signal to obtain a combined pulse signal, and the tire pressure is obtained according to the combined pulse signal.
Compared with the prior art, the tire pressure detection method provided by the invention has the advantages that the first Hall sensor is fixed with the vehicle body, the magnetic element passes through the sensing range of the first Hall sensor in the rotating process, the first Hall sensor senses to obtain the first pulse signal of the magnetic element and feeds the first pulse signal back to the controller, and the controller analyzes the tire pressure according to the first pulse signal, so that the first Hall sensor does not rotate along with the vehicle wheel, the movement of the first Hall sensor is reduced, the first Hall sensor is prevented from being damaged by long-term rotation, and the service life of the first Hall sensor is prolonged; moreover, the first Hall sensor and the controller can be electrically connected, the phenomenon of unstable wireless communication transmission signals is avoided, and the signal transmission is smoother.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a tire pressure detecting device provided in an embodiment of the present invention;
fig. 2 is a schematic view illustrating an assembly of a differential pressure reactor and a hermetic shell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rotation speed sensor according to an embodiment of the present invention;
fig. 4 is a first flowchart of a tire pressure detecting method according to an embodiment of the present invention;
fig. 5 is a second flowchart of a tire pressure detecting method according to an embodiment of the present invention;
FIG. 6 is a first flowchart of the signal acquisition and signal processing of FIG. 5;
FIG. 7 is a second flowchart of the signal acquisition and signal processing of FIG. 5;
FIG. 8 is a flow chart three of the signal acquisition and signal processing of FIG. 5;
FIG. 9 is a fourth flowchart of the signal acquisition and signal processing of FIG. 5;
FIG. 10 is a fifth flowchart of the signal acquisition and signal processing of FIG. 5;
fig. 11 is a first flowchart of a step of the controller resolving the tire pressure according to the received first pulse signal in the signal processing step in fig. 5;
fig. 12 is a second flowchart of the step of the controller resolving the tire pressure from the received first pulse signal in the signal processing step in fig. 5.
Wherein, in the figures, the respective reference numerals:
1-a closed shell; 2-pressure differential reactor; 21-a magnetic element; 22-a pressure member; 23-a guide groove; 24-a pressure balancing member; 25-a rubber diaphragm; 26-a guide post; 3-a first hall sensor; 4-a rotational speed sensor; 41-magnetic gear teeth; 42-a second hall sensor; 43-mounting frame.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and fig. 2 together, the tire pressure detecting device provided by the present invention will now be described. The tire pressure detection device comprises a closed shell 1, a pressure differential inductor 2, a first Hall sensor 3 and a controller (not shown in the figure), wherein the inner cavity of the closed shell 1 is used for being communicated with the inner cavity of a tire, the pressure differential inductor 2 comprises a magnetic element 21 arranged on the closed shell 1, the first Hall sensor 3 senses the magnetic element 21, and the controller is in communication connection with the first Hall sensor 3; the magnetic element 21 is movably arranged relative to the closed shell 1 and can move when the air pressure in the inner cavity of the closed shell 1 changes so as to change the detection distance H from the magnetic element 21 to the first Hall sensor 3.
Compared with the prior art, the tire pressure detection device provided by the invention has the advantages that the first Hall sensor 3 obtains a potential difference signal by sensing the magnetic element 21 and transmits the potential difference signal to the controller, the controller judges the magnetic field intensity sensed by the first Hall sensor 3 according to the received potential difference signal, then the distance between the magnetic element 21 and the first Hall sensor 3 when the potential difference signal is detected is determined, and finally the air pressure of the sealed shell 1 and the inner cavity of the tire is determined; the tire pressure detection device can be arranged outside the tire or exposed outside the tire, so that the detection device is prevented from being arranged in the inner cavity of the tire, the installation and the maintenance are convenient, the inner cavity of the tire is not influenced, and the safety is good; the inner cavity of the sealed shell 1 is communicated with the inner cavity of the tire, which is equivalent to directly detecting the air pressure of the tire, and the accuracy is high.
Preferably, the sealed shell 1 is a rigid shell, so that when the pressure of an inner cavity of the sealed shell 1 changes, the sealed shell 1 cannot deform obviously, the situation that the detection distance H between the magnetic element 21 and the first Hall sensor 3 changes due to the deformation of the sealed shell 1 is avoided, the influence of the deformation of the sealed shell 1 on the detection distance H between the magnetic element 21 and the first Hall sensor 3 is reduced, and the air pressure change of the tire can be better reflected by the change of the detection distance H between the magnetic element 21 and the first Hall sensor 3.
Further, referring to fig. 2, as a specific embodiment of the tire pressure detecting device provided by the present invention, the differential pressure sensor 2 further includes a pressure member 22 flexibly and hermetically connected to the sealed shell 1, the magnetic element 21 is fixedly disposed on the pressure member 22, the pressure member 22 flexibly and hermetically connected to the sealed shell 1 protrudes outward under the pressure of the air pressure in the inner cavity of the sealed shell 1, the higher the air pressure in the inner cavity of the sealed shell 1 is, the higher the protruding height of the pressure member 22 is, the closer the detection distance H between the magnetic element 21 and the first hall sensor 3 is, the stronger the magnetic field detected by the first hall sensor 3 is, the larger the generated potential difference is, and the controller determines the air pressure in the inner cavity of the sealed shell 1 and changes according to the magnitude of the potential difference, so as to determine the magnitude and change of the tire pressure.
Further, referring to fig. 2, as a specific embodiment of the tire pressure detecting device provided by the present invention, a guide groove 23 is provided on the hermetic shell 1, the pressure member 22 is flexibly and hermetically connected to a wall of the guide groove 23, the magnetic element 21 is slidably disposed in the guide groove 23, and the guide groove 23 is configured to enable the magnetic element 21 to better move toward a direction approaching to or away from the first hall sensor 3, so that a change in the detection distance H between the magnetic element 21 and the first hall sensor 3 can better reflect a change in the tire pressure, and the detection is more accurate.
Specifically, the pressure piece 22 and the closed shell 1 are connected through vulcanization by a rubber diaphragm 25, and the rubber diaphragm 25 is connected between the pressure piece 22 and the guide groove 23 through vulcanization; the sealing performance can be ensured, the relative movement freedom of the pressure piece 22 and the closed shell 1 can be ensured, and the flexible sealing connection of the closed shell 1 and the pressure piece 22 is realized through the rubber diaphragm 25.
Further, referring to fig. 2, as a specific embodiment of the tire pressure detecting device provided by the present invention, the differential pressure sensor 2 further includes a pressure balancing member 24, one end of the pressure balancing member 24 is fixed on the sealing shell 1, the other end is fixed on the pressure element 22, and the pressure of the pressure balancing member 24 on the pressure element 22 and the pressure of the air pressure in the inner cavity of the sealing shell 1 on the pressure element 22 keep dynamic balance; the pressure balancing component 24 can be used for dynamically balancing the pressure of the air pressure in the inner cavity of the sealed shell 1 to the pressure piece 22, so that the flexible sealing joint of the pressure piece 22 and the sealed shell 1 is prevented from being stressed too much, and the flexible sealing joint is prevented from being damaged, for example, the rubber diaphragm 25 is prevented from being damaged.
Alternatively, the pressure balancing member 24 is a component or device having a pre-compression energy storage capability, such as a hydraulic cylinder, a pneumatic cylinder, or a compression spring. Preferably, the pressure balance member 24 is a pressure spring, and the pressure spring has good linear elastic deformation performance, so that the change of the tire pressure and the change of the detection distance H of the pressure piece 22 relative to the first hall sensor 3 are in a linear relationship, the detection distance H of the pressure piece 22 and the first hall sensor 3 can better reflect the tire pressure, the rigidity of the pressure spring is K, the internal air pressure of the tire is P, the atmospheric pressure is Patm, the pressure area of the pressure piece 22 is S, and the compression deformation amount of the pressure spring is X; the spring stiffness K (P-Patm) S/X can be designed so that the restoring spring force of the spring can be dynamically balanced with the pressure of the inner cavity of the sealed housing 1 pressing against the pressure element 22.
Specifically, a guide rod 26 is fixedly arranged between the pressure piece 22 and the magnetic element 21, one end of the guide rod 26 is fixedly arranged on the pressure piece 22, the other end of the guide rod 26 is fixedly arranged on the magnetic element 21, the pressure spring is sleeved on the periphery of the guide rod 26, and the guide rod 26 is arranged to reserve enough space for the arrangement of the pressure balance member 24.
Further, referring to fig. 1, as an embodiment of the tire pressure detecting device provided by the present invention, a plurality of differential pressure actuators 2 are provided and distributed along a first circumference; in the process that the closed shell 1 rotates around an axis which is perpendicular to the first circumference and passes through the circle center of the first circumference, the magnetic element 21 can pass through the induction range of the first Hall sensor 3; the first circle is a virtual circle, and the pressure differential reactors 2 are distributed on the circle. On one hand, the tire is inevitably rotated when in use, so that the sealed shell 1 communicated with the inner cavity of the tire is required to rotate along with the tire when in a working state, however, long-term rotation movement not only easily causes the device to be damaged, but also the device can not be well communicated with the outside, the arrangement can prevent the first Hall sensor 3 and the controller from rotating along with the sealed shell 1, reduce the damage of the first Hall sensor 3 and prolong the service life of the first Hall sensor, so that the first Hall sensor 3 can be electrically connected with the controller, the unsmooth communication caused by adopting wireless communication is avoided, and the communication between the controller and the first Hall sensor 3 is more stable and smooth; on the other hand, the pressure differential reactor 2 is provided with a plurality of pressure differential reactors 2, so that a plurality of magnetic elements 21 can be used for measuring a plurality of groups of potential difference data, the device has good fault tolerance, the condition that one group of data obtained by adopting one pressure differential reactor 2 is wrong is avoided, and the detection is more accurate.
Preferably, the number of the differential pressure sensors 2 is 3-8, specifically, the number of the differential pressure sensors 2 is 4, so that 4 sets of tire pressure signals can be measured, the detection fault tolerance is good, and the detection is more accurate.
Further, as a specific embodiment of the tire pressure detecting device provided by the present invention, the sealed shell 1 is a revolving body, and the differential pressure reactors 2 are distributed along the circumferential direction of the sealed shell 1; the device is more concise; specifically, the closed shell 1 is circular, the inner periphery of the circular ring is fixed with the wheel shaft, the differential pressure reactor 2 is arranged on the outer periphery of the circular ring, and the closed shell 1 rotates coaxially and synchronously along with the wheel shaft when in use, so that the installation of the tire pressure detection device is facilitated.
Further, as one embodiment of the tire pressure detecting device provided by the present invention, the width D of each magnetic element 21 in the direction in which it rotates about the axis with the airtight shell 1 is different; can correspond each magnetic element 21 according to the width of each pulse of the first pulse signal that first hall sensor 3 response obtained like this, the change of the detection distance H of each magnetic element 21 relative first hall sensor 3 of judgement that like this can be more accurate, then more accurate reachs tire pressure, avoids data identification and processing to appear the mistake, guarantees the accuracy of detection.
Further, referring to fig. 1, as an embodiment of the tire pressure detecting device provided by the present invention, the detecting distances H from the magnetic elements 21 to the first hall sensors 3 are different, so that the first pulse signal intensities obtained by the first hall sensors 3 sensing the magnetic elements 21 are also different, and thus the detected data is more three-dimensionally accurate.
Preferably, the detection distances H from the magnetic elements 21 to the first hall sensor 3 are distributed in an arithmetic progression, so that the pulse signal distribution corresponding to each magnetic element 21 is more hierarchical and more beneficial to accurate detection, when the tire pressure is reduced to a certain extent, that is, the detection distance H from the magnetic element 21 to the first hall sensor 3 is far to a certain extent, the first hall sensor 3 cannot sense the magnetic element 21, that is, the signal of the magnetic element 21 disappears, and the disappearance of the signal of each magnetic element 21 corresponds to a specific tire pressure value, preferably, the corresponding tire pressure value can cover a normal air pressure range when the signal of each magnetic element 21 disappears; when the pulse signal of a certain magnetic element 21 disappears, the controller can quickly reflect the corresponding tire pressure value, so that the detection is more sensitive; in addition, the controller processes the detected data, and can preliminarily determine the tire pressure value range of the tire according to which pulse signals exist and which pulse signals disappear, so that large deviation between detection and data processing is avoided, when the pulse signals of a certain magnetic element 21 disappear or reappear, the corresponding tire pressure value can also be used for calibration of data processing, reference is provided for detection data processing, and both the detection and the data processing can be more accurate; the range of the tire pressure value of the corresponding tire when the signal of each magnetic element 21 disappears covers the normal tire pressure range, so that the tire pressure value of the tire can be detected more accurately when the tire pressure value of the tire is near the highest or lowest critical value of the normal tire pressure value, and the tire pressure value of the corresponding tire when the signal of the magnetic element 21 disappears can be set to be at the edge of the normal tire pressure range, so that the detection is more accurate and sensitive when the signal of the magnetic element 21 disappears.
Preferably, the pressure-receiving areas of the pressure pieces 22 in the sealed shell 1 are different, so that the balance position between the pressure of the air pressure in the inner cavity of the sealed shell 1 and the pressure of the pressure balance member 24 can be changed, and the purpose of different detection distances H from the magnetic elements 21 to the first hall sensor 3 is achieved.
Preferably, the pre-pressures of the pressure balance members 24 are different from each other, so that the balance position between the pressure of the air pressure in the inner cavity of the sealed shell 1 and the pressure of the pressure balance members 24 can be changed, and the purpose of different detection distances H from the magnetic elements 21 to the first hall sensor 3 is achieved.
Further, please refer to fig. 3, which is a specific embodiment of the tire pressure detecting device provided by the present invention, further comprising a rotation speed sensor 4 for detecting a rotation period of the sealed shell, wherein the rotation speed sensor 4 comprises a second hall sensor 42 and a magnetic gear tooth 41; the magnetic gear teeth 41 can pass through the sensing range of the second hall sensor 42 during the rotation of the magnetic gear teeth 41 around the axis, and the second hall sensor 42 is in communication connection with the controller; when the closed shell 1 rotates, the second Hall sensor 42 induces the magnetic gear teeth 41 to obtain a second pulse signal, and when the second pulse signal generates pulses with the number equal to that of the magnetic gear teeth 41, the closed shell 1 and the rotary sensor rotate for a rotation period, so that the pulses of the first pulse signal in different rotation periods can be better distinguished, each pulse in the same rotation period can sequentially correspond to each magnetic element 21 conveniently, each magnetic element 21 can accurately correspond to each pulse, and the detection is more accurate. Specifically, the magnetic gear 41 is fixed on the sealed shell 1, and the magnetic gear 41 is directly fixed on the sealed shell 1, so that the structure can be simplified.
Specifically, the tire pressure sensor is designed to detect tire pressures of 110KPa, 170KPa and 200KPa, the number of the magnetic gear teeth 41 is 48, and the tooth width is 2.61 mm; the 1 radius 40mm of sealed shell arranges 3 pressure differential reactors 2 on it, and the tire pressure that corresponds when setting up 3 magnetic element 21's signal disappearance is in proper order: 110KPa, 170KPa, 200KPa, the widths D of the 3 magnetic elements 21 in the direction in which they rotate with the hermetic vessel 1 are 2.61mm, 5.22mm, and 7.83mm, respectively; first, the rotation speed sensor 4 obtains the rotation period of the wheel, the controller matches the magnetic element 21 generating the pulse according to the width of each pulse in the first pulse signal, when the induction signal of the magnetic element 21 corresponding to 200KPa disappears in a certain period, it indicates that the tire pressure is less than 200KPa at the moment, and similarly, when the induction signal of the magnetic element 21 corresponding to 110KPa or 170KPa disappears, the corresponding tire pressure is less than 110KPa or 170 KPa.
Further, referring to fig. 3, as a specific embodiment of the tire pressure detecting device provided by the present invention, the rotation speed sensor 4 further includes an installation frame 43, the installation frame 43 is fixedly disposed on the sealed shell 1, and the magnetic gear 41 is fixedly disposed on the installation frame 43, so that the rotation speed sensor 4 and the sealed shell 1 do not need to be installed in direct contact, and the installation arrangement of the rotation speed sensor 4 and the sealed shell 1 is more flexible.
Preferably, the magnetic teeth 41 are provided in plurality and distributed along the circumferential direction of rotation of the hermetic shell 1, and the number of the magnetic teeth 41 is increased to enable cycle recognition to be more accurate.
Specifically, the number of magnetic teeth 41 is the same as that of the magnetic elements 21, and the magnetic teeth and the magnetic elements are arranged in a one-to-one correspondence, so that if a pulse signal of a certain magnetic element 21 disappears, the controller can more sensitively recognize the pulse signal.
Further, as a specific embodiment of the tire pressure detecting device provided by the present invention, a display device (not shown in the figure) in communication connection with the controller is further included, so that a driver can conveniently grasp the condition of the tire pressure in real time.
Further, as a specific embodiment of the tire pressure detecting device provided by the present invention, a warning device (not shown in the figure) in communication with the controller is further included, so that the driver can know in advance when the tire pressure is abnormal even if he does not pay attention to the tire pressure change in time, so as to make corresponding preparations in time. Of course, the display device and the display device can be arranged at the same time, so that a driver can conveniently master the condition of the tire pressure in real time, and the abnormal condition of the tire pressure can be warned.
For example, if the normal value of the tire pressure of a certain tire is 150KPa to 200KPa, 8 differential pressure actuators 2 may be provided, and the tire pressure values corresponding to the signal loss of each magnetic element 21 are: 130KPa, 140KPa, 150KPa, 170KPa, 190KPa, 200KPa, 210KPa, 220KPa, if the number of the magnetic elements 21 that can be sensed by the first hall sensor 3 is less than 3, which indicates that the tire pressure is lower than 150KPa at this time, an under-voltage alarm is issued; if the first hall sensor 3 can sense the signals of 3-5 magnetic elements 21, the tire pressure value at the moment is between 150KPa and 200 KPa; if the first hall sensor 3 can sense signals of more than 5 magnetic elements 21, which indicates that the tire pressure value is greater than 200KPa at the moment, a high-pressure alarm is issued.
Referring to fig. 4, the tire pressure detecting method according to the embodiment of the present invention, which uses the tire pressure detecting device having the first hall sensor 3 and the magnetic element 21, includes the following steps:
s11, preparation: the tire pressure detection device is arranged on a vehicle, the differential pressure reactor 2, the sealed shell 1 and the first Hall sensor 3 rotate synchronously with the vehicle wheel, and the inner cavity of the sealed shell 1 is communicated with the inner cavity of the vehicle tire;
s12, starting: starting the tire pressure detection device;
s13, detection: the first hall sensor 3 acquires a potential difference signal through the induction magnetic element 21 and feeds back the potential difference signal to the controller;
the controller obtains the tire pressure according to the received potential difference signal.
Compared with the prior art, the tire pressure detection method provided by the invention has the advantages that the adopted tire pressure detection device is convenient to install and maintain, does not influence the inner cavity of the tire and has good safety compared with the detection device arranged in the inner cavity of the tire; the inner cavity of the sealed shell 1 is communicated with the inner cavity of the tire, which is equivalent to directly detecting the air pressure of the tire, and the accuracy is high; the first hall sensor 3 senses the strength of the magnetic field of the magnetic element 21, so that the detection distance H between the first hall sensor 3 and the magnetic element 21 is obtained, and further, the detection mode of the tire pressure is obtained.
Preferably, the method further comprises the following display steps: the controller controls the display device to display the tire pressure in real time.
Preferably, the following alarming steps are also included: when the tire pressure is detected to exceed the preset working pressure range of the tire, the controller controls the alarm device to give an alarm.
Referring to fig. 5 to 12, the tire pressure detecting method according to the embodiment of the present invention, which uses the tire pressure detecting device with the first hall sensor 3 and the magnetic element 21, includes the following steps:
s21, preparation: the tire pressure detection device is arranged on a vehicle, the differential pressure reactor 2 and the sealed shell 1 rotate synchronously with the vehicle wheel, the first Hall sensor 3 is fixed with the vehicle body, and the magnetic element 21 can pass through the sensing range of the first Hall sensor 3 in the process of rotating along with the sealed shell 1 to communicate the inner cavity of the sealed shell 1 with the inner cavity of the tire;
s22, starting: starting the tire pressure detection device;
s23, signal acquisition;
and S24, signal processing.
Wherein, step S23 includes:
s231, the first Hall sensor 3 acquires a first pulse signal through the induction magnetic element 21 and feeds the first pulse signal back to the controller;
step S24 includes:
and S246, the controller analyzes the tire pressure according to the received first pulse signal.
Compared with the prior art, the tire pressure detection method provided by the invention has the advantages that the first Hall sensor 3 is fixed with the vehicle body, the magnetic element 21 passes through the sensing range of the first Hall sensor 3 in the rotating process, the first Hall sensor 3 senses to obtain the first pulse signal of the magnetic element 21 and feeds the first pulse signal back to the controller, and the controller analyzes the tire pressure according to the first pulse signal, so that the first Hall sensor 3 does not rotate along with the vehicle wheel, the movement of the first Hall sensor 3 is reduced, the first Hall sensor 3 is prevented from being damaged by long-term rotation, and the service life of the first Hall sensor 3 is prolonged; moreover, the first Hall sensor 3 and the controller can be electrically connected, the phenomenon of unstable wireless communication transmission signals is avoided, and the signal transmission is smoother.
Further, referring to fig. 6, as a specific implementation manner of the tire pressure detecting method according to the embodiment of the present invention, a plurality of pressure differential reactors 2 are provided, and are distributed along a first circumference, and an axis perpendicular to the first circumference and a center of the first circumference coincides with an axis of a wheel; when the widths D of the magnetic elements 21 in the direction rotating with the hermetic vessel 1 are different, step S24 further includes:
s241, the controller matches the magnetic element 21 generating the pulse according to the width of each pulse in the received first pulse signal; the widths D of the magnetic elements 21 in the direction rotating along with the sealed shell 1 are different, when the magnetic elements 21 rotate along with the sealed shell 1, the induction time of each magnetic element 21 and the first Hall sensor 3 in the same rotation period is different, the width of the obtained corresponding pulse is different, and the wider the width D is, the wider the width of the corresponding pulse is; therefore, the controller can be effectively matched with each pulse and each magnetic element 21 in the first pulse signal, the detection data is prevented from being identified disorderly, and the detection accuracy is ensured.
Further, referring to fig. 7, as a specific implementation manner of the tire pressure detecting method according to the embodiment of the present invention, a plurality of pressure differential reactors 2 are provided, and are distributed along a first circumference, and an axis perpendicular to the first circumference and a center of the first circumference coincides with an axis of a wheel; when the detection distances H from the magnetic elements 21 to the first hall sensor 3 are different, the step S24 further includes:
s242, the controller matches the magnetic element 21 generating the pulse according to the height of each pulse in the received first pulse signal; the detection distances H from the magnetic elements to the first Hall sensor 3 are different, the magnetic field intensity of the magnetic elements 21 sensed by the first Hall sensor 3 is different, the pulse height generated by the magnetic elements 21 sensed by the first Hall sensor 3 is different, and the closer the detection distance H is, the stronger the magnetic field intensity sensed by the first Hall sensor 3 is, the higher the corresponding pulse height is; on one hand, the controller can be effectively matched with each pulse and each magnetic element 21 in the first pulse signal, thereby avoiding the identification confusion of detection data and ensuring the detection accuracy; on the other hand, the heights of the pulses corresponding to the magnetic elements 21 are different, so that the detected data are more three-dimensional, and the detection accuracy is more favorable.
Further, referring to fig. 8 to fig. 10 together, as a specific implementation of the tire pressure detecting method provided by the embodiment of the present invention, when the tire pressure detecting device includes the rotation speed sensor 4, the step S23 further includes:
s232, the second Hall sensor 42 acquires a second pulse signal by sensing the magnetic gear teeth 41 and feeds the second pulse signal back to the controller;
referring to fig. 8, step S24 may include:
s243, the controller obtains the rotation period of the sealed shell 1 according to the received second pulse signal, and determines whether the pulse signal of each magnetic element 21 is lost in each rotation period by combining the rotation period and the first pulse signal, and matches the magnetic element 21 generating the pulse according to the height of each pulse in each rotation period in the received first pulse signal. The arrangement of the rotating speed sensor 4 can accurately measure the rotating speed of the closed shell 1 and determine the rotating period of the closed shell 1 in real time; therefore, the controller can match each pulse with each magnetic element 21 more accurately through the pulse width in each rotation period, so that the controller can master each pulse in the first pulse signal corresponding to each magnetic element 21; in addition, the controller can timely detect the pulse loss and the like, and can accurately sense the specific magnetic element 21 corresponding to the pulse signal loss and the tire pressure abnormity and the detection abnormity through the matching relation between each pulse and each magnetic element 21 in the same rotation period.
Referring to fig. 9, step S24 may further include:
s244, the controller obtains the rotation period of the hermetic shell 1 according to the received second pulse signal, and determines whether the pulse signal of each magnetic element 21 is lost in each rotation period by combining the rotation period and the first pulse signal, and matches the magnetic element 21 generating the pulse according to the height of each pulse in each rotation period in the received first pulse signal. Therefore, the controller can more accurately match each pulse in the first pulse signal with each magnetic element 21, and accurately identify the conditions of change, loss, reproduction and the like of the pulse signal corresponding to each magnetic element 21; on the other hand, the heights of the pulses corresponding to the magnetic elements 21 are different, so that the detected data are more three-dimensional, and the detection accuracy is more favorable.
Referring to fig. 10, step S24 may further include:
and S245, the controller obtains the rotation period of the closed shell 1 according to the received second pulse signal, judges whether the pulse signal of each magnetic element 21 is lost in each rotation period by combining the rotation period and the first pulse signal, and matches the magnetic element 21 generating the pulse according to the height and the width of each pulse in each rotation period in the received first pulse signal. Therefore, the controller can more accurately match each pulse in the first pulse signal with each magnetic element 21, and accurately identify the conditions of change, loss, reproduction and the like of the pulse signal corresponding to each magnetic element 21; on the other hand, the heights of the pulses corresponding to the magnetic elements 21 are different, so that the detected data are more three-dimensional, and the detection accuracy is more favorable.
Preferably, when the situation of pulse loss or recurrence occurs, the method further includes step S25:
and S25, the controller controls the alarm device to give an alarm.
Thus, when the pulse is lost or reproduced, the controller can sense the pulse and can know the corresponding magnetic element 21 in a matching way, and know the corresponding tire pressure value when the pulse signal of the magnetic element 21 disappears or reproduces.
Preferably, if the tire pressure value corresponding to the disappearance or reproduction of the pulse signal of the magnetic element 21 is lower than the tire pressure value corresponding to the disappearance or reproduction of the pulse signal of each magnetic element 21 with normal all other pulse signals and is higher than the tire pressure value corresponding to the disappearance or reproduction of the pulse signal of each magnetic element 21 with the disappearance of all other pulse signals, the step S25 further includes:
s251, the detected tire pressure is corrected by using the tire pressure value corresponding to the disappearance or reproduction of the pulse signal of the magnetic element 21.
Preferably, if the detected tire pressure value at this time is just at the edge of the normal tire pressure range, the step S25 further includes:
and S252, the controller controls the alarm device to give out corresponding under-voltage or high-voltage alarm.
Preferably, if the tire pressure value corresponding to the disappearance of the pulse signal of the magnetic element 21 is between the tire pressure values corresponding to the disappearance or reproduction of the pulse signals of the magnetic element 21 with normal pulse signals, and the loss of the pulse signal of the magnetic element 21 occurs, the step S25 further includes:
and S253, the controller controls the alarm device to send out an abnormal detection alarm.
Preferably, the method further comprises the step S26: the controller controls the display device to display the tire pressure in real time.
For example, if the tire pressure of the tire is normally 150KPa to 200KPa, 8 differential pressure actuators 2 may be provided, corresponding to 8 magnetic elements 21: p1, P2, P3 … … and P8, the tire pressure values corresponding to the signal loss of each magnetic element 21 are: 130KPa, 140KPa, 150KPa, 170KPa, 190KPa, 200KPa, 210KPa, and 220KPa, if the number of the magnetic elements 21 that can be sensed by the first hall sensor 3 is 3, which is P6, P7, and P8, respectively, at this time, the pulse signal disappears, and if the pulse signal that appears P6 disappears, the controller recognizes that the tire pressure value is 200KPa, corrects the tire pressure analysis process, and simultaneously issues a high pressure alarm; if the pulse signals of P7 or P8 disappear, an abnormal detection alarm is sent out; similarly, if the pulse signal reappears at this time, if the pulse signal reappears at P5, the controller identifies that the tire pressure value is 190KPa, corrects the tire pressure analysis process, and if the pulse signal reappears at any one of P1-P4, the controller sends out an abnormal detection alarm.
Further, referring to fig. 11 and fig. 12 together, as a specific implementation of the tire pressure detecting method according to the embodiment of the present invention, step S246 may include:
s2461, respectively obtaining an initial tire pressure by the controller according to the pulse signals of the magnetic elements 21 in the first pulse signals;
s2462, the controller performs average processing on each initially measured tire pressure to obtain the tire pressure; the tire pressure measured in this way integrates a plurality of groups of pulse signals of each magnetic element 21, and the primary tire pressure directly obtained has better fault tolerance and more accurate detection.
Step S246 may also include:
s2463, the controller combines and processes the actually measured pulse signals of the magnetic elements 21 in the first pulse signals to obtain combined pulse signals;
and S2464, the controller obtains the tire pressure according to the combined pulse signals, the tire pressure measured in this way is combined with a plurality of groups of pulse signals of each magnetic element 21, and the initially measured tire pressure directly obtained has better fault tolerance and more accurate detection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (16)
1. Tire pressure detection device, its characterized in that: the tire pressure detection device is arranged outside the tire or exposed outside the tire, and comprises a sealed shell, a differential pressure actuator, a first Hall sensor and a controller;
the closed shell is a rigid shell, the inner cavity of the closed shell is used for being communicated with the inner cavity of a tire, and a guide groove is formed in the closed shell;
the differential pressure reactor comprises a pressure piece arranged in the inner cavity of the closed shell and a magnetic element fixedly arranged on the pressure piece, the pressure piece is flexibly and hermetically connected to the wall of the guide groove, and the magnetic element is slidably arranged in the guide groove;
the first Hall sensor senses the magnetic element, and the controller is in communication connection with the first Hall sensor; the magnetic element is movably arranged relative to the closed shell and can move when the air pressure in the inner cavity of the closed shell changes so as to change the detection distance from the magnetic element to the first Hall sensor.
2. The tire pressure detecting device according to claim 1, wherein: the differential pressure reactor also comprises a pressure balance component, one end of the pressure balance component is fixedly arranged on the closed shell, the other end of the pressure balance component is fixedly arranged on the pressure piece, and the pressure of the pressure balance component on the pressure piece and the pressure of the inner cavity of the closed shell on the pressure piece are kept in dynamic balance.
3. The tire pressure detecting device according to claim 1, wherein: the pressure differential reactors are arranged in a plurality and distributed along a first circumference; and in the process that the closed shell rotates around an axis which is perpendicular to the first circumference and passes through the circle center of the first circumference, the magnetic element can pass through the induction range of the first Hall sensor.
4. The tire pressure detecting device according to claim 3, wherein: the closed shell is a revolving body, and the differential pressure reactors are distributed along the circumferential direction of the closed shell.
5. The tire pressure detecting device according to claim 3, wherein: the width of each magnetic element in the direction in which it rotates about the axis with the containment vessel is different.
6. The tire pressure detecting device according to claim 5, wherein: the detection distances from the magnetic elements to the first Hall sensor are different.
7. The tire pressure detecting device according to any one of claims 3 to 6, wherein: the rotating speed sensor is used for detecting the rotating period of the closed shell and comprises a second Hall sensor and magnetic gear teeth; the magnetic gear teeth can pass through the sensing range of the second Hall sensor in the process that the magnetic gear teeth rotate around the axis, and the second Hall sensor is in communication connection with the controller.
8. The tire pressure detecting device according to claim 7, wherein: the rotating speed sensor further comprises a mounting rack, the mounting rack is fixedly arranged on the closed shell, and the magnetic gear teeth are fixedly arranged on the mounting rack.
9. The tire pressure detecting device according to any one of claims 1 to 6, wherein: the device also comprises a display device in communication connection with the controller and/or an alarm device in communication connection with the controller.
10. The tire pressure detection method is characterized in that: the tire pressure detecting device according to any one of claims 1 to 9 is employed, including the steps of:
preparing: the tire pressure detection device is arranged on a vehicle, the pressure differential reactor, the closed shell and the first Hall sensor rotate synchronously with the wheel, and an inner cavity of the closed shell is communicated with an inner cavity of the tire;
starting: starting the tire pressure detection device;
and (3) detection: the first Hall sensor obtains a potential difference signal by sensing the magnetic element and feeds the potential difference signal back to the controller;
the controller obtains the tire pressure according to the received potential difference signal.
11. The tire pressure detection method is characterized in that: the tire pressure detecting device according to claim 1 or 2, comprising the steps of:
preparing: the tire pressure detection device is arranged on a vehicle, the pressure differential reactor and the closed shell synchronously rotate with wheels, the first Hall sensor is fixed with the vehicle body, and the magnetic element can communicate the inner cavity of the closed shell with the inner cavity of a tire through the sensing range of the first Hall sensor in the process of rotating along with the closed shell;
starting: starting the tire pressure detection device;
signal acquisition: the first Hall sensor obtains a first pulse signal by sensing the magnetic element and feeds the first pulse signal back to the controller;
signal processing: the controller analyzes the tire pressure according to the received first pulse signal.
12. The tire pressure detecting method according to claim 11, wherein: the pressure differential reactors are arranged in a plurality and distributed along a first circumference; the widths of the magnetic elements in the direction rotating along with the closed shell are different, and the signal processing step further comprises the following steps:
the controller matches the magnetic element that generated each pulse in the received first pulse signal according to the width of that pulse.
13. The tire pressure detecting method according to claim 11, wherein: the pressure differential reactors are distributed along a first circumference, and the detection distances from the magnetic elements to the first Hall sensor are different; the signal processing step further comprises:
the controller matches the magnetic element that generated each pulse in the received first pulse signal according to its height.
14. The tire pressure detecting method according to claim 12 or 13, wherein: the rotating speed sensor comprises a second Hall sensor and magnetic gear teeth; the signal acquisition step further comprises:
the second Hall sensor obtains a second pulse signal by sensing the magnetic gear teeth and feeds the second pulse signal back to the controller;
the signal processing step further comprises:
and the controller obtains the rotation period of the closed shell according to the received second pulse signal, and judges whether the pulse signals of the magnetic elements are lost in each rotation period by combining the rotation period and the first pulse signal.
15. The tire pressure detecting method according to claim 12 or 13, wherein: the signal processing step further comprises: the controller respectively obtains initial tire pressure according to the pulse signals of the magnetic elements in the first pulse signals, and obtains tire pressure by carrying out average processing on the initial tire pressure.
16. The tire pressure detecting method according to claim 12 or 13, wherein: the signal processing step further comprises: the controller combines and processes the measured pulse signals of the magnetic elements in the first pulse signal to obtain a combined pulse signal, and the tire pressure is obtained according to the combined pulse signal.
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| DE3410214A1 (en) * | 1984-03-20 | 1985-10-03 | Helmut 2000 Hamburg Reinhardt | Method and system for checking the air pressure of vehicle tyres, in particular of motor vehicles and motor cycles |
| CN1082494A (en) * | 1993-07-26 | 1994-02-23 | 陆基 | Dynamic pressure monitoring device for automobile tyre |
| JP3504311B2 (en) * | 1994-01-18 | 2004-03-08 | 株式会社フジクラ | Tire pressure detector |
| US6520006B2 (en) * | 2000-08-10 | 2003-02-18 | Mlho, Inc. | Remote pressure indicator for sealed vessels including vehicle tires |
| CN100478228C (en) * | 2004-05-14 | 2009-04-15 | 王德红 | Alarm Control device for pressure of car tire |
| EP1863655A4 (en) * | 2005-03-28 | 2008-11-26 | Michelin Soc Tech | Auto-location for tire pressure monitoring systems |
| CN201205851Y (en) * | 2008-03-22 | 2009-03-11 | 山东豪迈机械科技股份有限公司 | Automotive tire burst detection apparatus |
| CN201941531U (en) * | 2010-12-31 | 2011-08-24 | 董群 | Real time alarming system for pressure and temperature of car tires |
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