CN112060843B - Tire pressure monitoring circuit, system and method without oscillator - Google Patents
Tire pressure monitoring circuit, system and method without oscillator Download PDFInfo
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- CN112060843B CN112060843B CN202011096668.2A CN202011096668A CN112060843B CN 112060843 B CN112060843 B CN 112060843B CN 202011096668 A CN202011096668 A CN 202011096668A CN 112060843 B CN112060843 B CN 112060843B
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- 238000012545 processing Methods 0.000 claims description 3
- 230000002618 waking effect Effects 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 6
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
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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
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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 transmits 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 transmits 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 measured by the sensor onto the high-frequency carrier and transmits 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 cost of the tire pressure monitoring system and simplifies the circuit design.
Description
Technical Field
The present invention relates to the field of tire pressure monitoring, and in particular, to a tire pressure monitoring circuit without an oscillator, a monitoring system and a monitoring method.
Background
The tyre pressure monitoring system (Tire Pressure Monitoring System, abbreviated as TPMS) is a device for detecting physical data such as tyre pressure in the running process of an automobile by adopting a wireless transmission technology, and the tyre pressure monitoring system utilizes a high-sensitivity miniature wireless sensing device to collect data such as the tyre pressure, the temperature and the like of the automobile in a running or static state, transmits the data to a host, displays related data such as the tyre pressure, the temperature and the like of the automobile in a digital form in real time, and reminds a driver to perform early warning in the form of buzzing or voice and the like when the tyre is abnormal.
The existing tire pressure monitoring module receives control signals 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, high frequency communication requires accurate alignment of frequency channels, so that a high-precision crystal oscillator is required as a reference clock of a frequency synthesizer to generate a high frequency carrier, and a transmitter modulates data onto the carrier frequency and sends the data out through an antenna to achieve accurate alignment of communication channels. Referring to fig. 1, a block diagram of a conventional tire pressure monitoring system includes four tire pressure measuring modules, and a sensor, a Micro Control Unit (MCU) and a signal transceiver unit are disposed in each of the tire pressure measuring modules. 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 receiving and transmitting unit, the signal receiving and transmitting unit receives the control signal and then uses the control signal as a reference clock of the frequency synthesizer through the crystal oscillator to generate a high-frequency carrier, and the transmitter modulates data to the carrier frequency and then sends the data out through the antenna so as to realize accurate alignment of communication channels.
However, a 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 having four tires and a spare tire requires at least four tire pressure monitoring modules, and therefore at least four expensive high-precision crystal oscillators, the cost of the whole vehicle increases.
Therefore, a new 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 following technical scheme:
An oscillator-free tire pressure monitoring circuit, comprising: one or more sensors, the sensors comprising pressure sensors; a microprocessor coupled to the sensor; a low frequency receiver coupled to the microprocessor; a high frequency transmission assembly coupled to the microprocessor, comprising 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 wave based on the reference clock signal, and the high-frequency transmitter modulates sensing data measured by the 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 device 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 square wave signal after frequency multiplication 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 the control signal sent by the vehicle central control system to wake up the microprocessor, and 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 a preset time after receiving the control signal sent by the vehicle central control system.
In a further embodiment, the sensor further comprises one or more of a temperature sensor, a voltage sensor and an acceleration sensor.
In another aspect, the present invention also provides an oscillator-free tire pressure monitoring system, including:
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, wherein the low-frequency transmitter of the vehicle central control system sends a signal with a 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 sensing data measured by the sensor onto the high-frequency carrier 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 sensed data with a reference value pre-stored in the vehicle central control system, and if the sensed data is greater than the reference value, the vehicle central control system sends an alarm signal through an alarm device.
In a further embodiment, the tire pressure monitoring modules are mounted on hubs of vehicle tires, each tire pressure monitoring module corresponds to each hub one by one, the tire pressure monitoring modules monitor the tires in real time through the sensors, sensing data obtained by monitoring the sensors are transmitted to the frequency synthesizer through the microprocessor, the frequency synthesizer generates a high-frequency carrier wave, and the sensing data measured by the sensors are modulated onto the high-frequency carrier wave by the high-frequency transmitter and then transmitted to the vehicle central control system through the antenna.
In still another aspect, the present invention also provides a monitoring method of an oscillator-free tire pressure monitoring system, which includes:
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, then sends the square wave signal to a frequency synthesizer as a reference clock signal, the frequency synthesizer sends a high-frequency carrier based on the reference clock signal, and the high-frequency transmitter modulates sensing data obtained by monitoring a sensor onto the high-frequency carrier and 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 operation according to a control signal requirement of the vehicle central unit, and the vehicle central control system sends a signal with a preset frequency to the low frequency receiver immediately or after waiting for a preset 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 expensive crystal oscillators for signal modulation, greatly saves the production cost of the tire pressure monitoring system and simplifies the circuit design.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of circuitry of a prior art tire pressure monitoring system;
FIG. 2 is a block diagram of circuitry of the tire pressure monitoring system of the present invention in one embodiment;
fig. 3 is a block diagram of circuitry of the tire pressure monitoring system of the present invention in another embodiment.
Wherein, 100-the tire pressure measuring module; 110-a micro control unit; 120-low frequency receiver; 130-a frequency synthesizer; 140-a crystal oscillator; 150-high frequency transmitter; 160-a whole vehicle central control unit;
200-a tire pressure monitoring module; 210-a sensing unit; 2101-pressure sensor; 2102-temperature sensor; 2103-voltage sensor; 2104-acceleration sensor; 211-a microprocessor; 212-a signal receiving and transmitting unit; 2121-low frequency receiver; 2122-signal amplifier; 2123-frequency synthesizer; 2124-high frequency transmitter; 213-frequency doubler; 214-vehicle central control system.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The gist of the present invention will be further described with reference to the drawings and examples.
Examples:
Referring to fig. 1, a block diagram of a conventional tire pressure monitoring system is shown, and the tire pressure monitoring system includes four tire pressure measuring modules 100, and a sensor, a micro control unit 110 (MCU), and a signal transceiver unit including a low frequency receiver 120, a frequency synthesizer 130, a crystal oscillator 140, and a high frequency transmitter 150 are disposed in each tire pressure measuring module 100. When the tire pressure monitoring system is used for monitoring, the whole vehicle central control unit 160 sends a control signal to the low-frequency receiver 120, the signal receiving and transmitting unit receives the control signal and then uses the control signal as a reference clock of the frequency synthesizer 130 through the crystal oscillator 140 to generate a high-frequency carrier, and the transmitter modulates data to the carrier frequency and then sends the data out through an antenna so as to realize accurate alignment of communication channels. In the process of monitoring by using the tire pressure measuring system, signal modulation is required to be carried out through a crystal oscillator, and each measuring module needs to be provided with a crystal oscillator, so that the cost of the existing tire pressure monitoring system is too high.
In view of the above problems, the present 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 firstly 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 operates a preset program, and performs corresponding operation according to the requirement of the wake-up signal of the vehicle central control system, wherein the wake-up signal is also a control signal which controls the wake-up micro control center MCU to start running; the central control system of the vehicle continues to send a sine wave signal (or square wave signal) with fixed frequency immediately or after waiting for a certain time after sending the wake-up signal; the low-frequency receiver of the tire pressure monitoring module receives the fixed-frequency signal and connects the signal to the signal amplifier, the signal amplifier amplifies the received signal to be saturated into 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, the frequency precision of the fixed-frequency signal transmitted by the vehicle central control unit is not changed in the transmission process, and the frequency channels of the high-frequency transmitter and the high-frequency receiver of the vehicle central unit are precisely aligned, so the tire pressure monitoring module can not need a crystal oscillator.
In one aspect, the present invention provides an oscillator-free 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 transmission component coupled to the microprocessor 211, 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 sensing data measured by the sensor onto the high frequency carrier and sends the sensing data to the vehicle central control system 214 through an antenna.
In one embodiment, the tire pressure monitoring circuit further includes a frequency multiplier 213, which is configured to perform frequency multiplication processing 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, where 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 the control signal sent by the vehicle central control system 214 to wake up the microprocessor 211, and the microprocessor 211 runs a preset program to perform a corresponding operation according to the control signal requirement of the vehicle central control system 214, and the low frequency receiver 2121 receives the signal of 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.
On the other hand, with continued reference to fig. 2, the present invention further provides an oscillator-free tire pressure monitoring system, which includes a plurality of tire pressure monitoring modules 200, wherein each monitoring module includes the tire pressure monitoring circuit described above; the monitoring module 200 includes a sensing unit 210, a micro control unit and a signal transceiving unit 212, the sensing unit 210 includes one or more sensors, the micro control unit includes a microprocessor 211, the signal transceiving unit 212 includes a low frequency receiver 2121, a signal amplifier 2122 and a high frequency transmitting component including a frequency synthesizer 2123 and a high frequency transmitter 2124; the low frequency receiver 2121 sends a received signal with a predetermined frequency to a 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 a 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 sensing data measured 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, where the low frequency transmitter of the vehicle central control system 214 sends a signal with a predetermined frequency to the low frequency receiver 2121 of the monitoring module 200, and the high frequency transmitter 2124 modulates the sensing data measured by the sensor onto the high frequency carrier wave and sends the sensing data to the high frequency receiver of the vehicle central control system 214 through an antenna, and 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 sends an alarm signal through 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 hubs of vehicle tires, each monitoring module 200 corresponds to each hub one by one, the monitoring modules 200 monitor the tire in real time through the sensor, sensing data obtained by monitoring the sensor is transmitted to the frequency synthesizer 2123 through the microprocessor, the frequency synthesizer 2123 generates a high-frequency carrier wave, and the high-frequency transmitter 2124 modulates the sensing data measured by the sensor onto the high-frequency carrier wave and then sends the sensing data to the vehicle central control system 214 through an antenna.
In one embodiment, the tire pressure monitoring system of the present invention further includes a frequency multiplier 213, where the frequency multiplier 213 multiplies the square wave signal output by the signal amplifier 2122, and outputs the square wave signal after the frequency multiplication 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, through which the monitoring module 200 monitors 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, primarily related to the type and number of sensors).
The micro control unit of the present invention receives the control signal of the vehicle central control system 214 from the low frequency receiver 2121, and acquires the sensing data through the sensor after receiving the control signal, the micro control unit sends the sensing data to the frequency synthesizer 2123, the frequency synthesizer 2123 generates a high frequency carrier wave, and the high frequency transmitter 2124 modulates the sensing data onto the high frequency carrier wave and transmits the sensing data to the vehicle central control system 214 via an antenna.
In one embodiment, the data detecting center of the signal processing unit of 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 tire physical parameters, so as to understand the tire condition in many ways.
In one 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 to operate 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 acquires measurement data from the sensor according to the control signal. In one case, the control signal may be sent out immediately after the vehicle central control system 214 sends out the wake-up signal, in another case, a delay time may be set in the vehicle central control system 214, the vehicle central control system 214 may delay sending out the control signal according to the delay time after sending out the wake-up signal, both modes may be monitored normally, and of course, the delay time should not be too long so as not to affect signal updating.
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 obtained 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 waveform 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 a square wave signal obtained by amplifying a signal to the frequency multiplier 213, and the frequency multiplier 213 multiplies the square wave signal, and the multiplied square wave signal is sent to the frequency synthesizer 2123 as a reference clock signal. In the tire pressure monitoring system according to the present invention, since the fixed frequency signal transmitted from the vehicle central control unit is known, the frequency accuracy will not change during the transmission process, and the channels of the high frequency transmitter 2124 and the high frequency receiver of the vehicle central unit 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-free tire pressure monitoring system, including:
the monitoring module 200 of the monitoring system receives a control signal sent by the vehicle central control system 214 through a low-frequency receiver 2121, amplifies the control signal through a signal amplifier 2122 to obtain a square wave signal, then sends the square wave signal to a frequency synthesizer 2123 as a reference clock signal, the frequency synthesizer 2123 sends a high-frequency carrier based on the reference clock signal, and the high-frequency transmitter 2124 modulates sensing data obtained by sensor monitoring onto the high-frequency carrier and sends the sensing data to the vehicle central control system 214 through an antenna.
In one embodiment, the low frequency receiver 2121 receives the 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, where the microprocessor 211 runs a preset program to perform a corresponding operation according to the control signal requirement of the vehicle central unit, and the vehicle central control system 214 sends a signal with a predetermined frequency to the low frequency receiver 2121 immediately or after waiting for a predetermined time after sending the control signal to wake up the microprocessor 211 of the monitoring module 200.
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 measurement data through a 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 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 that the frequency modulation of the crystal oscillator is not used, 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 expensive crystal oscillator for signal modulation, thereby greatly saving the production and manufacturing cost of the tire pressure monitoring system and simplifying the circuit design.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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. Further, one skilled in the art may combine and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications and alternatives to the above embodiments may be made by those skilled in the art within the scope of the invention.
Claims (6)
1. An oscillator-free tire pressure monitoring circuit, comprising:
one or more sensors, the sensors comprising a pressure sensor, the sensors further comprising one or more of a temperature sensor, a voltage sensor, and an acceleration sensor;
A microprocessor coupled to the sensor;
a low frequency receiver coupled to the microprocessor;
a high frequency transmission assembly coupled to the microprocessor, comprising 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 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, 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,
The low-frequency receiver receives the control signal sent by the vehicle central control system so as to wake up the microprocessor, the microprocessor runs a preset program and then performs 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.
2. The tire pressure monitoring circuit of claim 1, further comprising:
And the frequency multiplier is used for carrying out frequency multiplication processing on the square wave signal output by the signal amplifier, outputting the square wave signal after frequency multiplication to the frequency synthesizer as a reference clock signal, and amplifying the received signal to saturation by the signal amplifier to form the square wave signal.
3. An oscillator-free tire pressure monitoring system, comprising:
A plurality of tire pressure monitoring modules, wherein each monitoring module comprises a tire pressure monitoring circuit of any one of claims 1 or 2;
the vehicle central control system comprises a low-frequency transmitter and a high-frequency receiver, wherein the low-frequency transmitter of the vehicle central control system sends a signal with a 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 sensing data measured by the sensor onto the high-frequency carrier and then sends the sensing data to the high-frequency receiver of the vehicle central control system through an antenna.
4. A system according to claim 3, wherein the vehicle central control system compares the sensed data with a reference value pre-stored in the vehicle central control system, and if the sensed data is greater than the reference value, the vehicle central control system sends a warning signal via a warning device.
5. The system according to claim 4, wherein the tire pressure monitoring modules are mounted on hubs of vehicle tires, each tire pressure monitoring module corresponds to each hub one by one, the tire pressure monitoring modules monitor the tires in real time through the sensors, sensing data obtained by monitoring the sensors are transmitted to the frequency synthesizer through the microprocessor, the frequency synthesizer generates a high-frequency carrier wave, and the sensing data measured by the sensors are modulated onto the high-frequency carrier wave by the high-frequency transmitter and then transmitted to the vehicle central control system through the antenna.
6. A monitoring method of an oscillator-free tire pressure monitoring system, 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, then sends the square wave signal as a reference clock signal to a frequency synthesizer, the frequency synthesizer sends a high-frequency carrier based on the reference clock signal, a high-frequency transmitter modulates sensing data obtained by sensor monitoring onto the high-frequency carrier and sends the sensing data to the vehicle central control system through an antenna,
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, and then corresponding operation is carried out according to the control signal requirement of the vehicle central unit, and the vehicle central control system sends a signal with preset frequency to the low-frequency receiver immediately or after waiting for preset time after sending the control signal for waking up the microprocessor of the tire pressure monitoring module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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