CN112060843A - Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator - Google Patents
Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator Download PDFInfo
- Publication number
- CN112060843A CN112060843A CN202011096668.2A CN202011096668A CN112060843A CN 112060843 A CN112060843 A CN 112060843A CN 202011096668 A CN202011096668 A CN 202011096668A CN 112060843 A CN112060843 A CN 112060843A
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- tire pressure
- pressure monitoring
- central control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001133 acceleration Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention discloses a tire pressure monitoring circuit without an oscillator, a monitoring system and a monitoring method, wherein the monitoring system comprises a sensing unit, a micro control unit, a low-frequency receiver, a signal amplifier, a frequency synthesizer and a high-frequency transmitter, the low-frequency receiver sends a received signal with a preset frequency to the signal amplifier, the signal amplifier amplifies the signal with the preset frequency to obtain a square wave signal, the signal amplifier sends the square wave signal to the frequency synthesizer, the frequency synthesizer obtains a reference clock signal based on the square wave signal, the frequency synthesizer generates a high-frequency carrier based on the reference clock signal, and the high-frequency transmitter modulates sensing data detected by the sensor onto the high-frequency carrier and then sends the sensing data to the high-frequency receiver through an antenna. The tire pressure monitoring system can meet the use requirement without an expensive crystal oscillator, saves the production and manufacturing cost of the tire pressure monitoring system and simplifies the circuit design.
Description
Technical Field
The invention relates to the field of tire pressure monitoring, in particular to a tire pressure monitoring circuit, a monitoring system and a monitoring method without an oscillator.
Background
The Tire Pressure Monitoring System (TPMS) is a device for detecting physical data such as Tire Pressure and the like in the running process of an automobile by adopting a wireless transmission technology, and the device collects the data such as the Pressure, the temperature and the like of the automobile Tire by utilizing a high-sensitivity micro wireless sensing device in a running or static state, transmits the data to a host, displays the related data such as the Pressure, the temperature and the like of the automobile Tire in a digital form in real time, and reminds a driver to give an early warning in the form of buzzing or voice and the like when the Tire is abnormal.
The existing tire pressure monitoring module receives a control signal of a vehicle central unit through a low-frequency receiver, measures data of a sensor, and finally sends the measured sensor data to the vehicle central unit through a high-frequency transmitter. However, the high frequency communication requires precise alignment of channels, so a high-precision crystal oscillator is required to be used as a reference clock of a frequency synthesizer to generate a high frequency carrier, and a transmitter modulates data onto a carrier frequency and then transmits the modulated data through an antenna, so as to achieve precise alignment of the communication channels. Referring to fig. 1, a block diagram of a circuit system of an existing tire pressure monitoring system is shown, the tire pressure monitoring system includes four tire pressure measuring modules, and each tire pressure measuring module is provided with a sensor, a Micro Control Unit (MCU) and a signal transceiver unit. When the tire pressure monitoring system is used for monitoring, the central control unit of the whole vehicle sends a control signal to the signal transceiving unit, the signal transceiving unit generates a high-frequency carrier wave by taking the crystal oscillator as a reference clock of the frequency synthesizer after receiving the control signal, and the transmitter modulates data onto carrier frequency and sends the data out through the antenna so as to realize accurate alignment of communication channels.
However, the crystal oscillator is an oscillator using a quartz crystal as a main crystal material, and can generate a highly stable signal, but the material cost is high. A vehicle has four tires and a spare tire, at least four tire pressure monitoring modules are required, and therefore at least four expensive high-precision crystal oscillators are required, and the cost of the whole vehicle is increased.
Therefore, a new technical solution is needed to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and on one hand, the invention provides a tire pressure monitoring circuit without an oscillator, which adopts the technical scheme that:
an oscillator-less tire pressure monitoring circuit, comprising: one or more sensors, including a pressure sensor; a microprocessor coupled to the sensor; a low frequency receiver coupled to the microprocessor; a high frequency transmit assembly coupled to the microprocessor, including a frequency synthesizer and a high frequency transmitter; a signal amplifier coupled to the microprocessor; the low-frequency receiver receives a signal with a preset frequency sent by a vehicle central control system, the signal amplifier amplifies the signal with the preset frequency received by the low-frequency receiver to obtain a square wave signal, a reference clock signal of the frequency synthesizer is obtained based on the square wave signal, the frequency synthesizer generates a high-frequency carrier based on the reference clock signal, and the high-frequency transmitter modulates sensing data measured by the sensor onto the high-frequency carrier and then sends the sensing data to the vehicle central control system through an antenna.
In a further embodiment, the frequency synthesizer further comprises a frequency multiplier, wherein the frequency multiplier is used for performing frequency multiplication on the square wave signal output by the signal amplifier and outputting the frequency-multiplied square wave signal to the frequency synthesizer as a reference clock signal; the signal amplifier amplifies the received signal to saturation to form a square wave signal.
In a further embodiment, the low frequency receiver receives a control signal sent by the vehicle central control system to wake up the microprocessor, the microprocessor runs a preset program to perform corresponding operations according to the control signal requirement of the vehicle central control system, and the low frequency receiver receives the signal with the preset frequency immediately or after waiting for a preset time after receiving the control signal sent by the vehicle central control system.
In a further embodiment, the sensors further comprise one or more of a temperature sensor, a voltage sensor and an acceleration sensor.
In another aspect, the present invention also provides an oscillator-less tire pressure monitoring system, comprising:
a plurality of tire pressure monitoring modules, wherein each monitoring module comprises the tire pressure monitoring circuit;
the vehicle central control system comprises a low-frequency transmitter and a high-frequency receiver, the low-frequency transmitter of the vehicle central control system sends signals with preset frequency to the low-frequency receiver of the tire pressure monitoring circuit, and the high-frequency transmitter of the tire pressure monitoring circuit modulates the sensing data measured by the sensor onto the high-frequency carrier wave and then sends the sensing data to the high-frequency receiver of the vehicle central control system through an antenna.
In a further embodiment, the vehicle central control system compares the sensing data with a reference value pre-stored in the vehicle central control system, and if the sensing data is greater than the reference value, the vehicle central control system sends out a warning signal through a warning device.
In a further embodiment, the tire pressure monitoring modules are installed on wheel hubs of vehicle tires, each tire pressure monitoring module corresponds to each wheel hub one to one, the tire pressure monitoring modules monitor the tires in real time through the sensors, sensing data obtained by monitoring of the sensors are transmitted to the frequency synthesizer through the microprocessor, the frequency synthesizer generates high-frequency carriers, and the high-frequency transmitter modulates the sensing data detected by the sensors onto the high-frequency carriers and then transmits the sensing data to the vehicle central control system through an antenna.
In still another aspect, the present invention also provides a monitoring method of an oscillator-less tire pressure monitoring system, including:
the tire pressure monitoring module of the tire pressure monitoring system receives a control signal sent by a vehicle central control system through a low-frequency receiver, amplifies the control signal through a signal amplifier to obtain a square wave signal, and sends the square wave signal to a frequency synthesizer as a reference clock signal, the frequency synthesizer sends a high-frequency carrier wave based on the reference clock signal, and the high-frequency transmitter modulates sensing data obtained by monitoring of a sensor onto the high-frequency carrier wave and then sends the sensing data to the vehicle central control system through an antenna.
In a further embodiment, the low frequency receiver receives a control signal sent by the vehicle central control system to wake up a microprocessor of a tire pressure monitoring module of the tire pressure monitoring system, the microprocessor runs a preset program to perform corresponding operations according to the control signal requirement of the vehicle central unit, and the vehicle central control system sends a signal with a predetermined frequency to the low frequency receiver immediately or after waiting for a predetermined time after sending the control signal to wake up the microprocessor of the tire pressure monitoring module.
Compared with the prior art, the tire pressure monitoring system can meet the use requirement without using an expensive crystal oscillator for signal modulation, greatly saves the production and manufacturing cost of the tire pressure monitoring system, and simplifies the circuit design.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit system block diagram of a conventional tire pressure monitoring system;
FIG. 2 is a block diagram of the circuitry of the tire pressure monitoring system of the present invention in one embodiment;
fig. 3 is a block diagram of circuitry for a tire pressure monitoring system according to another embodiment of the present invention.
100-a tire pressure measuring module; 110-a micro control unit; 120-a low frequency receiver; 130-a frequency synthesizer; 140-a crystal oscillator; 150-a high frequency transmitter; 160-vehicle central control unit;
200-a tire pressure monitoring module; 210-a sensing unit; 2101-pressure sensor; 2102-temperature sensor; 2103-a voltage sensor; 2104-acceleration sensor; 211-a microprocessor; 212-a signal transceiving unit; 2121-a low frequency receiver; 2122-signal amplifier; 2123-frequency synthesizer; 2124-a high frequency transmitter; 213-a frequency multiplier; 214-vehicle central control system.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The gist of the present invention will be further explained below with reference to the accompanying drawings and examples.
Example (b):
referring to fig. 1, which is a block diagram of a circuit system of an existing tire pressure monitoring system, the tire pressure monitoring system includes four tire pressure measuring modules 100, each of the tire pressure measuring modules 100 is provided with a sensor, a micro control unit 110(MCU), and a signal transceiving unit including a low frequency receiver 120, a frequency synthesizer 130, a crystal oscillator 140, and a high frequency transmitter 150. When the tire pressure monitoring system is used for monitoring, the vehicle central control unit 160 sends a control signal to the low-frequency receiver 120, the signal transceiver unit generates a high-frequency carrier by using the control signal as a reference clock of the frequency synthesizer 130 through the crystal oscillator 140 after receiving the control signal, and the transmitter modulates data onto a carrier frequency and sends the data out through the antenna so as to realize accurate alignment of communication channels. In the process of monitoring by using the tire pressure measuring system, signal modulation must be carried out through a crystal oscillator, and each measuring module needs to be provided with one crystal oscillator, so that the cost of the existing tire pressure monitoring system is overhigh.
In order to solve the problems, the invention provides a tire pressure monitoring system without an oscillator, when the tire pressure monitoring system is used for monitoring, a vehicle central control system can send a wake-up signal to a low-frequency receiver of a tire pressure monitoring module, the low-frequency receiver of the tire pressure monitoring module wakes up an MCU after receiving the wake-up signal, the MCU runs a preset program and carries out corresponding operation according to the requirements of the wake-up signal of the vehicle central control system, and the wake-up signal is also a control signal which controls the wake-up microcontroller central MCU to start running; after the vehicle central control system sends the wake-up signal, the vehicle central control system immediately or after waiting for a certain time continues to send a sine wave signal (or square wave signal) with fixed frequency; the low frequency receiver of the tire pressure monitoring module receives the signal with fixed frequency and connects the signal to the signal amplifier, the signal amplifier amplifies the received signal to saturation to form square wave, the square wave signal from the signal amplifier is used as a reference clock to be connected to the reference clock input end of the frequency synthesizer, the control signal is transmitted to the vehicle central control system through the high frequency transmitter, because the fixed frequency signal sent by the vehicle central control unit is known, the frequency precision can not change in the transmission process, and the frequency channels of the high frequency transmitter and the high frequency receiver of the vehicle central unit are accurately aligned, the tire pressure monitoring module of the invention can not need a crystal oscillator.
In one aspect, the present invention provides an oscillator-less tire pressure monitoring circuit, comprising: one or more sensors, including a pressure sensor 2101; a microprocessor 211 coupled to the sensor; a low frequency receiver 2121 coupled to the microprocessor 211; a high frequency transmitting assembly coupled to the microprocessor 211 and including a frequency synthesizer 2123 and a high frequency transmitter 2124; a signal amplifier 2122 coupled to the microprocessor 211; the low frequency receiver 2121 receives a signal with a predetermined frequency sent by the vehicle central control system 214, the signal amplifier 2122 amplifies the signal with the predetermined frequency received by the low frequency receiver 2121 to obtain a square wave signal, a reference clock signal of the frequency synthesizer 2123 is obtained based on the square wave signal, the frequency synthesizer 2123 generates a high frequency carrier based on the reference clock signal, and the high frequency transmitter 2124 modulates the sensing data detected by the sensor onto the high frequency carrier and sends the modulated sensing data to the vehicle central control system 214 via an antenna.
In one embodiment, the tire pressure monitoring circuit further includes a frequency multiplier 213, configured to perform frequency multiplication on the square wave signal output by the signal amplifier 2122 and output the frequency-multiplied square wave signal to the frequency synthesizer 2123 as a reference clock signal, and the signal amplifier 2122 amplifies the received signal to saturation to form a square wave signal.
In one embodiment, the low frequency receiver 2121 receives a control signal sent by the vehicle central control system 214 to wake up the microprocessor 211, the microprocessor 211 runs a preset program to perform corresponding operations according to the control signal requirement of the vehicle central control system 214, and the low frequency receiver 2121 receives the signal with the predetermined frequency immediately after receiving the control signal sent by the vehicle central control system 214 or after waiting for a predetermined time.
In one embodiment, the sensors further include one or more of a temperature sensor 2102, a voltage sensor 2103, and an acceleration sensor 2104.
In another aspect, with continued reference to fig. 2, the present invention further provides an oscillator-less tire pressure monitoring system comprising a plurality of tire pressure monitoring modules 200, wherein each monitoring module comprises the tire pressure monitoring circuit described above; the monitoring module 200 comprises a sensing unit 210, a micro-control unit and a signal transceiving unit 212, the sensing unit 210 comprising one or more sensors, the micro-control unit comprising a microprocessor 211, the signal transceiving unit 212 comprising a low frequency receiver 2121, a signal amplifier 2122 and a high frequency transmitting assembly comprising a frequency synthesizer 2123 and a high frequency transmitter 2124; the low frequency receiver 2121 sends the received signal with the predetermined frequency to the signal amplifier 2122, the signal amplifier 2122 amplifies the signal with the predetermined frequency to obtain a square wave signal, the signal amplifier 2122 sends the square wave signal to the frequency synthesizer 2123, the frequency synthesizer 2123 obtains a reference clock signal based on the square wave signal, the frequency synthesizer 2123 generates a high frequency carrier based on the reference clock signal, and the high frequency transmitter 2124 modulates the sensing data detected by the sensor onto the high frequency carrier and sends the sensing data to the high frequency receiver through an antenna.
In one embodiment, the tire pressure monitoring system of the present invention further includes a vehicle central control system 214, which includes a low frequency transmitter and a high frequency receiver, the low frequency transmitter of the vehicle central control system 214 transmits a signal with a predetermined frequency to the low frequency receiver 2121 of the monitoring module 200, the high frequency transmitter 2124 modulates the sensing data detected by the sensor onto the high frequency carrier and transmits the modulated sensing data to the high frequency receiver of the vehicle central control system 214 via an antenna, the vehicle central control system 214 compares the sensing data with a reference value pre-stored in the vehicle central control system 214, and if the sensing data is greater than the reference value, the vehicle central control system 214 transmits an alarm signal via an alarm device.
In one embodiment, the tire pressure monitoring system includes a plurality of tire pressure monitoring modules 200, the monitoring modules 200 are installed on the wheel hubs of the vehicle tires, each monitoring module 200 corresponds to each wheel hub one-to-one, the monitoring modules 200 monitor the tires in real time through the sensors, the sensing data obtained by the monitoring of the sensors is transmitted to the frequency synthesizer 2123 through the microprocessor, the frequency synthesizer 2123 generates a high-frequency carrier, and the high-frequency transmitter 2124 modulates the sensing data detected by the sensors onto the high-frequency carrier and then transmits the modulated sensing data to the vehicle central control system 214 through the antenna.
In one embodiment, the tire pressure monitoring system further includes a frequency multiplier 213, where the frequency multiplier 213 performs frequency multiplication on the square wave signal output by the signal amplifier 2122 and outputs the frequency-multiplied square wave signal to the frequency synthesizer 2123 as a reference clock signal; the sensing unit 210 includes one or more of a pressure sensor 2101, a temperature sensor 2102, a voltage sensor 2103 and an acceleration sensor 2104 by which the monitoring module 200 monitors the physical parameter values of the tire (which may include a tire pressure value, a tire temperature value, a monitoring module 200 power supply voltage value and a tire axial acceleration value, depending primarily on the type and number of sensors).
According to the present invention, the micro control unit receives a control signal of the vehicle central control system 214 from the low frequency receiver 2121, acquires sensing data through the sensor after receiving the control signal, sends the sensing data to the frequency synthesizer 2123, the frequency synthesizer 2123 generates a high frequency carrier, and the high frequency transmitter 2124 modulates the sensing data onto the high frequency carrier and transmits the high frequency carrier to the vehicle central control system 214 via the antenna.
In one embodiment, the data detection center of the signal processing unit according to the present invention includes a pressure sensor 2101, a temperature sensor 2102, a voltage sensor 2103 and an acceleration sensor 2104, and one or more sensors may be provided in one tire pressure monitoring module 200, and these sensors may be different types of sensors to monitor different physical parameters of the tire, so as to understand the condition of the tire in many aspects.
In an embodiment, when the monitoring system of the present invention is used for monitoring, the vehicle central control system 214 sends a wake-up signal (control signal) to the low frequency receiver 2121, the low frequency receiver 2121 sends the wake-up signal to the micro control unit, the micro control unit starts operation after receiving the wake-up signal, the vehicle central control system 214 sends a control signal to the low frequency receiver 2121 again, and the micro control unit receives the control signal sent by the vehicle central control system 214 from the low frequency receiver 2121 and obtains measurement data from the sensor according to the control signal. In one case, the vehicle central control system 214 may send the control signal immediately after sending the wake-up signal, in another case, a delay time may be set in the vehicle central control system 214, and the vehicle central control system 214 may delay sending the control signal according to the delay time after sending the wake-up signal.
In one embodiment, with continued reference to fig. 2, the control signal of the present invention may be a waveform signal with a fixed frequency, a sine wave signal with a fixed frequency, or a square wave signal; the micro control unit receives the control signal and then acquires measurement data through the sensor, wherein the measurement data comprises a tire pressure value, a tire temperature value, a power supply voltage value of the monitoring module 200 and a tire axial acceleration value; the micro control unit converts the measurement data acquired from the sensor into a waveform signal, and then sends the waveform signal to the signal amplifier 2122, and the signal amplifier 2122 amplifies the waveform signal and sends the amplified signal to the frequency synthesizer 2123.
In an embodiment, referring to fig. 3, the signal transceiver center of the present invention may further include a frequency multiplier 213, the signal amplifier 2122 sends the square wave signal obtained by signal amplification to the frequency multiplier 213, the frequency multiplier 213 performs frequency multiplication on the square wave signal, and the frequency-multiplied square wave signal is sent to the frequency synthesizer 2123 as a reference clock signal. In the tire pressure monitoring system of the present invention, since the fixed frequency signal transmitted by the vehicle central control unit is known, the frequency precision does not change during the transmission process, and the frequency channels of the high frequency transmitter 2124 and the vehicle central unit high frequency receiver are precisely aligned, the tire pressure monitoring module 200 may not need a crystal oscillator.
In still another aspect, the present invention also provides a monitoring method of an oscillator-less tire pressure monitoring system, including:
the monitoring module 200 of the monitoring system receives a control signal transmitted from the vehicle central control system 214 through the low frequency receiver 2121, amplifies the control signal through the signal amplifier 2122 to obtain a square wave signal, and transmits the square wave signal as a reference clock signal to the frequency synthesizer 2123, the frequency synthesizer 2123 transmits a high frequency carrier based on the reference clock signal, and the high frequency transmitter 2124 modulates sensing data obtained by monitoring a sensor onto the high frequency carrier and transmits the sensing data to the vehicle central control system 214 through an antenna.
In one embodiment, the low frequency receiver 2121 receives a control signal sent by the vehicle central control system 214 to wake up the microprocessor 211 of the monitoring module 200 of the monitoring system, the microprocessor 211 runs a preset program, and then performs corresponding operations according to the control signal requirement of the vehicle central unit, and after the vehicle central control system 214 sends the control signal to wake up the microprocessor 211 of the monitoring module 200, the low frequency receiver 2121 sends a signal with a predetermined frequency immediately or after waiting for a predetermined time.
The monitoring method of the tire pressure monitoring system of the present invention is that the vehicle central control system 214 sends a control signal to the monitoring module 200 of the monitoring system, the low frequency receiver 2121 of the monitoring module 200 receives the control signal, the low frequency receiver 2121 sends the control signal to the micro control unit of the monitoring module 200, the micro control unit obtains the measurement data through the sensor according to the control signal, and the micro control unit sends the obtained measurement data to the frequency synthesizer 2123.
The monitoring method of the tire pressure monitoring system without the oscillator can ensure that the frequency channels of the high-frequency transmitter 2124 of the tire pressure monitoring module 200 and the high-frequency receiver of the vehicle central control unit are accurately aligned under the condition of not using the frequency modulation of the crystal oscillator, the monitoring method is simplified, and the monitoring cost is reduced.
Compared with the prior art, the monitoring circuit of the tire pressure monitoring system without the oscillator can meet the use requirement without performing signal modulation on an expensive crystal oscillator, greatly saves the production and manufacturing cost of the tire pressure monitoring system, and simplifies the circuit design.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. An oscillator-less tire pressure monitoring circuit, comprising:
one or more sensors, including a pressure sensor;
a microprocessor coupled to the sensor;
a low frequency receiver coupled to the microprocessor;
a high frequency transmit assembly coupled to the microprocessor, including a frequency synthesizer and a high frequency transmitter;
a signal amplifier coupled to the microprocessor;
wherein the low frequency receiver receives a signal with a predetermined frequency sent by a vehicle central control system,
the signal amplifier amplifies a signal with a preset frequency received by the low-frequency receiver to obtain a square wave signal, a reference clock signal of the frequency synthesizer is obtained based on the square wave signal,
the frequency synthesizer generates a high-frequency carrier based on the reference clock signal, and the high-frequency transmitter modulates the sensing data measured by the sensor onto the high-frequency carrier and then transmits the sensing data to the vehicle central control system through an antenna.
2. The tire pressure monitoring circuit of claim 1, further comprising:
a frequency multiplier for performing frequency multiplication processing on the square wave signal output by the signal amplifier and outputting the frequency-multiplied square wave signal to the frequency synthesizer as a reference clock signal,
the signal amplifier amplifies the received signal to saturation to form a square wave signal.
3. The tire pressure monitoring circuit of claim 1,
the low-frequency receiver receives a control signal sent by the vehicle central control system to wake up the microprocessor, the microprocessor runs a preset program to perform corresponding operation according to the control signal requirement of the vehicle central control system,
and the low-frequency receiver receives the signal with the preset frequency immediately or after waiting for preset time after receiving the control signal sent by the vehicle central control system.
4. The tire pressure monitoring circuit of claim 1,
the sensors also include one or more of a temperature sensor, a voltage sensor, and an acceleration sensor.
5. An oscillator-less tire pressure monitoring system, comprising:
a plurality of tire pressure monitoring modules, wherein each monitoring module comprises the tire pressure monitoring circuit of any of claims 1-4;
the vehicle central control system comprises a low-frequency transmitter and a high-frequency receiver, the low-frequency transmitter of the vehicle central control system sends signals with preset frequency to the low-frequency receiver of the tire pressure monitoring circuit, and the high-frequency transmitter of the tire pressure monitoring circuit modulates the sensing data measured by the sensor onto the high-frequency carrier wave and then sends the sensing data to the high-frequency receiver of the vehicle central control system through an antenna.
6. The oscillator-less tire pressure monitoring system of claim 5,
and the vehicle central control system compares the sensing data with a reference value prestored in the vehicle central control system, and if the sensing data is greater than the reference value, the vehicle central control system sends out a warning signal through a warning device.
7. The oscillator-less tire pressure monitoring system of claim 6,
the tire pressure monitoring module is arranged on a wheel hub of a vehicle tire, each tire pressure monitoring module corresponds to each wheel hub one to one, the tire pressure monitoring module monitors the tire in real time through the sensor, sensing data obtained by monitoring the sensor is transmitted to the frequency synthesizer through the microprocessor, the frequency synthesizer generates a high-frequency carrier, and the high-frequency transmitter modulates the sensing data detected by the sensor to the high-frequency carrier and transmits the sensing data to the vehicle central control system through the antenna.
8. A monitoring method for a tire pressure monitoring system without an oscillator, comprising:
the tire pressure monitoring module of the tire pressure monitoring system receives a control signal sent by a vehicle central control system through a low-frequency receiver, amplifies the control signal through a signal amplifier to obtain a square wave signal, and sends the square wave signal to a frequency synthesizer as a reference clock signal, the frequency synthesizer sends a high-frequency carrier wave based on the reference clock signal, and the high-frequency transmitter modulates sensing data obtained by monitoring of a sensor onto the high-frequency carrier wave and then sends the sensing data to the vehicle central control system through an antenna.
9. The monitoring method of an oscillator-less tire pressure monitoring system according to claim 8,
the low-frequency receiver receives the control signal sent by the vehicle central control system to wake up the microprocessor of the tire pressure monitoring module of the tire pressure monitoring system, the microprocessor runs a preset program to further carry out corresponding operation according to the control signal requirement of the vehicle central unit,
and after the vehicle central control system sends out a control signal for awakening the microprocessor of the tire pressure monitoring module, the vehicle central control system immediately or after waiting for a preset time sends out a signal with a preset frequency to the low-frequency receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096668.2A CN112060843A (en) | 2020-10-14 | 2020-10-14 | Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096668.2A CN112060843A (en) | 2020-10-14 | 2020-10-14 | Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112060843A true CN112060843A (en) | 2020-12-11 |
Family
ID=73655865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011096668.2A Pending CN112060843A (en) | 2020-10-14 | 2020-10-14 | Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112060843A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114475099A (en) * | 2022-02-10 | 2022-05-13 | 南京英锐创电子科技有限公司 | Low-frequency decoding integrated circuit and TPMS control system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3938077A (en) * | 1973-11-28 | 1976-02-10 | Bridgestone Tire Company, Ltd. | Alarm device for continually indicating the state of air pressure in a plurality of tires |
| JPS62149503A (en) * | 1985-12-24 | 1987-07-03 | Nippon Soken Inc | Wheel air pressure detector |
| EP1152109A2 (en) * | 2000-05-03 | 2001-11-07 | Delphi Technologies, Inc. | Hand-free access and/or starting system for a motor vehicle |
| US20020014115A1 (en) * | 1999-06-16 | 2002-02-07 | Jorge A. Young | Tire pressure sensory and monitoring method |
| WO2004091940A1 (en) * | 2003-04-14 | 2004-10-28 | The Yokohama Rubber Co., Ltd. | Tire watch system |
| WO2005086767A2 (en) * | 2004-03-08 | 2005-09-22 | Brandt Taylor G | Induction sensor |
| US20090072959A1 (en) * | 2007-09-19 | 2009-03-19 | Hitachi, Ltd. | Tire Pressure Monitoring System |
| CN201484089U (en) * | 2009-04-01 | 2010-05-26 | 燕山大学 | Automobile tire pressure monitoring and alarming device |
| KR20150108681A (en) * | 2014-03-18 | 2015-09-30 | 주식회사 만도 | Radar device for vehicle and control method of it |
| CN106965632A (en) * | 2015-12-22 | 2017-07-21 | 协瑞德电子有限公司 | For the apparatus surveillance of pneumatic tyre and system being used together with vehicle-mounted stabilizing control system |
| CN212422723U (en) * | 2020-10-14 | 2021-01-29 | 美新半导体(天津)有限公司 | Tire pressure monitoring circuit and monitoring system without oscillator |
-
2020
- 2020-10-14 CN CN202011096668.2A patent/CN112060843A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3938077A (en) * | 1973-11-28 | 1976-02-10 | Bridgestone Tire Company, Ltd. | Alarm device for continually indicating the state of air pressure in a plurality of tires |
| JPS62149503A (en) * | 1985-12-24 | 1987-07-03 | Nippon Soken Inc | Wheel air pressure detector |
| US20020014115A1 (en) * | 1999-06-16 | 2002-02-07 | Jorge A. Young | Tire pressure sensory and monitoring method |
| EP1152109A2 (en) * | 2000-05-03 | 2001-11-07 | Delphi Technologies, Inc. | Hand-free access and/or starting system for a motor vehicle |
| WO2004091940A1 (en) * | 2003-04-14 | 2004-10-28 | The Yokohama Rubber Co., Ltd. | Tire watch system |
| WO2005086767A2 (en) * | 2004-03-08 | 2005-09-22 | Brandt Taylor G | Induction sensor |
| US20090072959A1 (en) * | 2007-09-19 | 2009-03-19 | Hitachi, Ltd. | Tire Pressure Monitoring System |
| CN201484089U (en) * | 2009-04-01 | 2010-05-26 | 燕山大学 | Automobile tire pressure monitoring and alarming device |
| KR20150108681A (en) * | 2014-03-18 | 2015-09-30 | 주식회사 만도 | Radar device for vehicle and control method of it |
| CN106965632A (en) * | 2015-12-22 | 2017-07-21 | 协瑞德电子有限公司 | For the apparatus surveillance of pneumatic tyre and system being used together with vehicle-mounted stabilizing control system |
| CN212422723U (en) * | 2020-10-14 | 2021-01-29 | 美新半导体(天津)有限公司 | Tire pressure monitoring circuit and monitoring system without oscillator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114475099A (en) * | 2022-02-10 | 2022-05-13 | 南京英锐创电子科技有限公司 | Low-frequency decoding integrated circuit and TPMS control system |
| CN114475099B (en) * | 2022-02-10 | 2023-09-08 | 南京英锐创电子科技有限公司 | Low frequency decoding integrated circuit and TPMS control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6441728B1 (en) | Tire condition sensor communication with tire location provided via vehicle-mounted identification units | |
| US7696902B2 (en) | Tire sensor device and tire information transmission method | |
| CN100564079C (en) | The tyre pressure controlling system of automobile | |
| CN101423008A (en) | Automobile tire pressure monitoring system using blue-tooth technique | |
| US11198336B2 (en) | Transmission and receiving arrangement for a tire pressure detection device | |
| CN205395672U (en) | Tyre pressure monitoring apparatus | |
| CN212422723U (en) | Tire pressure monitoring circuit and monitoring system without oscillator | |
| JP2016094036A (en) | Trigger module | |
| CN112060843A (en) | Tire pressure monitoring circuit, monitoring system and monitoring method without oscillator | |
| JP4329634B2 (en) | Method for setting transmitter identifier with setter having unique identifier and tire pressure monitoring system | |
| CN204586381U (en) | Wireless direct-type tire pressure monitoring system | |
| CN202879169U (en) | Passive delay linetype acoustic surface wave tire pressure sensor and tire pressure monitoring system | |
| JP2016107823A (en) | On-vehicle notification device and notification system | |
| CN106515321A (en) | Tyre pressure monitoring system based on single chip microcomputer | |
| CN108263150A (en) | The tire pressure detector of free-standing | |
| CN206141240U (en) | Tyre pressure monitoring system based on singlechip | |
| JP4325496B2 (en) | Tire pressure monitoring device | |
| JP2006273077A (en) | Wheel installing position determining device, wheel position information setting device and wheel information acquisition device | |
| Löhndorf et al. | MEMS for automotive tire pressure monitoring systems | |
| JP4018617B2 (en) | Transmitter for tire condition monitoring device | |
| CN208085413U (en) | The tire pressure detector of free-standing | |
| EP2644411A1 (en) | Apparatus for monitoring tire conditions and method thereof | |
| CN220842095U (en) | High-precision tire pressure monitoring control device | |
| US20240149625A1 (en) | Equipment For An Electronic System for Checking The Pressure of the Tyres Of A Motor Vehicle | |
| CN205417046U (en) | TPMS calibration system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |