CN212073571U - Tire pressure detection system - Google Patents
Tire pressure detection system Download PDFInfo
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- CN212073571U CN212073571U CN202020323399.8U CN202020323399U CN212073571U CN 212073571 U CN212073571 U CN 212073571U CN 202020323399 U CN202020323399 U CN 202020323399U CN 212073571 U CN212073571 U CN 212073571U
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Abstract
The utility model provides a tire pressure detecting system uses NXP high pressure tire pressure monitoring sensor, and it is high with the temperature accuracy to utilize this chip to measure tire pressure, and external interface is abundant. The antenna of the tire pressure monitoring unit is selected and matched in an internal mode and an external mode, and can be selected according to vehicle types of different customers. The tire pressure monitoring unit with the built-in antenna is small in size. The tire pressure monitoring unit of the external antenna has strong signal receiving capacity, and can receive signals for tires far away. The system CAN configure parameters such as tire layout, alarm value, tire sensor ID and the like of the system through the CAN line, and CAN be suitable for various tire layouts of various vehicle types. The system is convenient to adjust to be a handheld device, and is more convenient for after-sale maintenance and use by customers.
Description
Technical Field
The utility model relates to a pressure detection field especially relates to a tire pressure detecting system including tire detection and sensing.
Background
With the development of the automobile industry, the application of the tire pressure monitoring technology is more and more extensive, the tire pressure detection system can be used for monitoring the states of the tire, such as pressure, temperature and the like in real time, and the tire pressure monitoring system has great significance for the safe driving of the vehicle.
Currently, the conventional tire pressure monitoring systems can be divided into two main categories, the first category is indirect tire pressure monitoring systems, which are mainly used for detecting the rotation speed of each tire. If the tire pressure monitoring system detects that the difference between the rotating speed of one tire and the rotating speeds of other tires is too large, the situation that the tire pressure of the tires with different rotating speeds is abnormal is indicated, and a driver is further informed.
The second type is a direct tire pressure monitoring system, which is mainly provided with a tire pressure monitor inside a tire or on an air tap of the tire, can directly detect whether the pressure of each tire is abnormal, and can provide the actual tire pressure of each tire for a driver.
Generally, a tire pressure monitor of a direct tire pressure monitoring system usually has a signal transmitter for transmitting tire pressure data to a display unit inside a vehicle in a wireless manner, and a driver can know tire pressure information of each tire through the display unit.
In addition, a battery is required to be disposed in the tire pressure monitor to drive the tire pressure monitor to detect the tire pressure of the tire and transmit the tire pressure information to a display unit in the vehicle. However, since the tire pressure monitor of the direct tire pressure monitoring system is disposed inside the tire or on the air nozzle of the tire, when the battery power in the tire pressure monitor is exhausted, the battery needs to be replaced, which often causes considerable trouble to the user
Therefore, it is an urgent need in the market to provide a tire pressure detecting system that is safer and more convenient to use and can detect a plurality of signals simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a tire pressure detecting system through wireless sending information and bus transmission, realizes the real-time detection of key data such as tire pressure. Particularly, the utility model provides a following technical scheme:
a tire pressure detection system comprises a tire pressure sensing unit and a tire pressure monitoring unit;
the tire pressure sensing unit and the tire pressure monitoring unit wirelessly transmit data signals; the tire pressure monitoring unit is connected with the CAN bus;
the tire pressure sensing unit comprises an antenna circuit;
the tire pressure sensing unit adopts a chip FXTH871502DT1 as a data processing core component, and the connection mode of the chip FXTH871502DT1 is as follows: a pin 14 of the chip FXTH871502DT1 is connected with a pin 1 of the crystal oscillator G1, and a pin 13 of the chip FXTH871502DT1 is connected with an inductor L1 in series and then connected with a pin 3 of the crystal oscillator G1; pins 1 and 3 of the crystal oscillator G1 are respectively connected with the capacitor C5 and the capacitor C4 in series and then grounded, and pin 2 of the crystal oscillator G1 is grounded; the power supply is saved at the pin 7 and the pin 8 of the FXTH871502DT 1; pin 11 of the chip FXTH871502DT1 is connected to the RF terminal of the antenna circuit.
Preferably, the antenna circuit is connected in a manner that: the RF end is connected with a power supply through an inductor L2 and an inductor L7 which are mutually connected in series, the RF end is connected with a capacitor C7 in series and then grounded, meanwhile, the RF end is connected with one end of an inductor L3 in series, the other end of the inductor L3 is sequentially connected with an inductor L8 and a capacitor C11 in series, and a capacitor C8 is connected between the inductor L3 and the inductor L8 in series and then grounded; after the capacitor C11 is connected in series with the inductor L6, the end of the coil antenna 1 and the end of the coil antenna 2 are grounded; the capacitor C11 and the inductor L6 are grounded through the capacitor C10, and the inductor L6 and the coil antenna 1 are grounded through the capacitor C6.
Preferably, the chip FXTH871502DT1 is hard wired to the antenna circuit.
Preferably, the tire pressure monitoring unit uses a chip SX1239, and the chip SX1239 circuit is: pins 4 and 5 of the chip SX1239 are respectively connected with pins 1 and 3 of a crystal oscillator G10, pins 1 and 3 of a crystal oscillator G10 are respectively connected with a capacitor C44 and a capacitor C45 in series and then are grounded, and pin 2 of a crystal oscillator G10 is grounded; a pin 21 of the chip SX1239 is connected with a radio frequency receiving circuit; pin 2 of chip SX1239 is grounded through capacitors C24 and C81 which are connected in parallel, and pin 3 of chip SX1239 is grounded through capacitors C25 and C9 which are connected in parallel.
Preferably, the radio frequency receiving circuit is connected in a manner that: a pin 21 of the chip SX1239 is connected with a receiving antenna after being connected with a capacitor C37 and a capacitor C38 in series, and the capacitor C37 and the capacitor C38 are grounded after being connected with a capacitor C39 in series; pin 21 of chip SX1239 is connected in series with inductor L21 and then grounded.
Preferably, one end of the receiving antenna is grounded. For example, the terminal No. 1 of the receiving antenna is connected to the capacitor C38, the terminal No. 2 is grounded, and the terminal No. 3 is floating.
Preferably, the receiving antenna is an internal antenna or an external antenna.
Compared with the prior art, the utility model has the advantages of it is following:
1. the system is flexible to use and is suitable for various vehicle types. Various tire layouts.
2. The working temperature range is large, and the temperature can be between 40 ℃ below zero and 105 ℃, so that the environment is severe.
3. The pressure value and the temperature value are tested with high precision.
4. The tire data is accurate and comprehensive, the data is sent to the CAN bus, and other bus devices CAN easily use the data.
5. The ultra-high sensitivity of the tire pressure receiving unit can be used in severe application environments of indoor and outdoor low temperature, high temperature and high interference sources.
Drawings
Fig. 1 is a block diagram of the overall electrical structure of the detection system according to the embodiment of the present invention;
fig. 2 is a circuit diagram of a tire pressure monitoring unit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a transmitting antenna according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a tire pressure sensing unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
In a specific embodiment, the tire pressure detecting system provided by the present invention may include a tire pressure sensing unit and a tire pressure monitoring unit;
the tire pressure sensing unit and the tire pressure monitoring unit wirelessly transmit data signals; the tire pressure monitoring unit is connected with the CAN bus;
the tire pressure sensing unit comprises an antenna circuit;
the core circuit of the tire pressure sensing unit is shown in fig. 4, and the core chip FXTH871502DT1 can measure pressure and temperature. G1 is the crystal oscillator of the chip. With reference to fig. 4, in a specific embodiment, the tire pressure sensing unit employs a chip FXTH871502DT1 as a data processing core component, and the connection mode of the chip FXTH871502DT1 is as follows: a pin 14 of the chip FXTH871502DT1 is connected with a pin 1 of the crystal oscillator G1, and a pin 13 of the chip FXTH871502DT1 is connected with an inductor L1 in series and then connected with a pin 3 of the crystal oscillator G1; pins 1 and 3 of the crystal oscillator G1 are respectively connected with the capacitor C5 and the capacitor C4 in series and then grounded, and pin 2 of the crystal oscillator G1 is grounded; pins 7 and 8 of the chip FXTH871502DT1 are power-saving, and the power can be taken from 3.3VDC of a button cell, for example. Pin 11 of the chip FXTH871502DT1 is connected to the RF terminal of the antenna circuit.
In still another preferred embodiment, in conjunction with fig. 3, the antenna circuit of the tire pressure sensing unit can stabilize the radio frequency signal to be transmitted, so that the tire pressure signal can be stably transmitted. The circuit has the function of amplifying and stabilizing the signal of the signal source. The transmission of signals during use of the tire pressure detection system is particularly important, so the design of the antenna circuit is very important regardless of the tire pressure sensing unit or the tire pressure receiving unit. In fig. 3, the antenna circuit of the tire pressure sensing unit is one of the classical circuits designed by the applicant, and the signal is stable.
The antenna circuit connection mode is as follows: the RF end is connected with a power supply through an inductor L2 and an inductor L7 which are mutually connected in series, the RF end is connected with a capacitor C7 in series and then grounded, meanwhile, the RF end is connected with one end of an inductor L3 in series, the other end of the inductor L3 is sequentially connected with an inductor L8 and a capacitor C11 in series, and a capacitor C8 is connected between the inductor L3 and the inductor L8 in series and then grounded; after the capacitor C11 is connected in series with the inductor L6, the end of the coil antenna 1 and the end of the coil antenna 2 are grounded; the capacitor C11 and the inductor L6 are grounded through the capacitor C10, and the inductor L6 and the coil antenna 1 are grounded through the capacitor C6.
Preferably, the chip FXTH871502DT1 is hard wired to the antenna circuit. Other pin connection modes of the FXTH871502DT1 chip and a data acquisition connection line mode between the chip FXTH871502DT1 chip and the sensor belong to common general knowledge in the art, and can be directly known by those skilled in the art according to the functions and descriptions of the chip pins, and are not taken as the improvement point and the invention point of the scheme, and are not described again here.
In a preferred embodiment, in conjunction with fig. 2, the tire pressure monitoring unit is configured to receive data from the sensors and convert the data. And the converted data is sent to the CAN bus. The tire pressure monitoring unit uses a chip SX1239 ultrahigh frequency wireless receiving and transmitting chip to receive the tire pressure information sent by the tire pressure sensing unit. The module has ultrahigh sensitivity and wide temperature range, and can be used in severe application environments of indoor and outdoor low temperature, high temperature and high interference sources. The tire pressure monitoring unit uses a chip SX1239, and the chip SX1239 circuit is as follows: pins 4 and 5 of the chip SX1239 are respectively connected with pins 1 and 3 of a crystal oscillator G10, pins 1 and 3 of a crystal oscillator G10 are respectively connected with a capacitor C44 and a capacitor C45 in series and then are grounded, and pin 2 of a crystal oscillator G10 is grounded; a pin 21 of the chip SX1239 is connected with a radio frequency receiving circuit; pin 2 of chip SX1239 is grounded through capacitors C24 and C81 which are connected in parallel, and pin 3 of chip SX1239 is grounded through capacitors C25 and C9 which are connected in parallel. Other pin connection modes of the chip SX1239 and connection modes for transmitting the monitored signal to the CAN bus belong to common general knowledge in the art, and CAN be directly known by those skilled in the art according to the functions and descriptions of the chip pin.
In a specific embodiment, with reference to fig. 2, the radio frequency receiving circuit in the tire pressure receiving unit can receive the circuit transmitted by the tire pressure sensing unit, and in addition, the tire pressure monitoring unit needs to add an antenna, which only needs to be built in most of the schemes, but needs to add an external antenna in the tire layout of a specific vehicle type. Whether the external antenna needs to be added or not depends on the actual condition of the vehicle. In the system, two solutions of an internal antenna and an external antenna are provided. Specifically, the radio frequency receiving circuit is connected in the following manner: a pin 21 of the chip SX1239 is connected with a receiving antenna after being connected with a capacitor C37 and a capacitor C38 in series, and the capacitor C37 and the capacitor C38 are grounded after being connected with a capacitor C39 in series; pin 21 of chip SX1239 is connected in series with inductor L21 and then grounded.
Preferably, one end of the receiving antenna is grounded. For example, the terminal No. 1 of the receiving antenna is connected to the capacitor C38, the terminal No. 2 is grounded, and the terminal No. 3 is floating.
The tire pressure monitoring unit is provided with special software, and can be flexibly configured by the special software so as to be suitable for different vehicle types.
In actual use, the adaptable environment of the tire pressure sensing unit and the tire pressure monitoring unit is as follows:
(1) tire pressure sensing unit
Working temperature: -40 ℃ to 105 DEG C
Storage temperature: -40 ℃ to 125 DEG C
The working frequency is as follows: 434MHz
Pressure test error: +/-30 kPa;
temperature test error: plus or minus 3 ℃;
voltage measurement error: 0.2V;
pressure measurement range: 150kPa to 1500 kPa;
temperature measurement range: -40 ℃ to 125 ℃;
voltage measurement range: 1.8V to 3.6V;
the tire pressure sensing unit comprises two parts of data acquisition and data transmission. The data acquisition function comprises the acquisition of an air pressure value, a temperature value and a power supply battery voltage value in the tire. The data transmission function refers to the mode that collected data are transmitted outwards in a radio frequency wireless transmission mode.
(2) Tire pressure monitoring unit
Working temperature range: -40 ℃ to 85 ℃;
radio frequency receiving frequency: 434 MHz;
the tire pressure monitoring unit is used for receiving the data sent by the sensor and converting the data. And the converted data is sent to the CAN bus.
Through the above description of the technical solution, it can be understood by those skilled in the art that the technical solution of the present invention has the following features:
1. comprises a tire pressure sensing unit and a tire pressure monitoring unit.
2. The tire pressure sensing unit comprises two parts of data acquisition and data transmission.
3. The data acquisition function comprises the acquisition of an air pressure value, a temperature value and a power supply battery voltage value in the tire.
4. The data transmission function refers to the mode that collected data are transmitted outwards in a radio frequency wireless transmission mode.
5. The tire pressure monitoring unit is used for receiving the data sent by the sensor and converting the data. And the converted data is sent to the CAN bus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (6)
1. A tire pressure detection system is characterized by comprising a tire pressure sensing unit and a tire pressure monitoring unit;
the tire pressure sensing unit and the tire pressure monitoring unit wirelessly transmit data signals; the tire pressure monitoring unit is connected with the CAN bus;
the tire pressure sensing unit comprises an antenna circuit;
the tire pressure sensing unit adopts a chip FXTH871502DT1 as a data processing core component, and the connection mode of the chip FXTH871502DT1 is as follows: a pin 14 of the chip FXTH871502DT1 is connected with a pin 1 of the crystal oscillator G1, and a pin 13 of the chip FXTH871502DT1 is connected with an inductor L1 in series and then connected with a pin 3 of the crystal oscillator G1; pins 1 and 3 of the crystal oscillator G1 are respectively connected with the capacitor C5 and the capacitor C4 in series and then grounded, and pin 2 of the crystal oscillator G1 is grounded; the power supply is saved at the pin 7 and the pin 8 of the FXTH871502DT 1; pin 11 of the chip FXTH871502DT1 is connected with the RF end of the antenna circuit;
the antenna circuit connection mode is as follows: the RF end is connected with a power supply through an inductor L2 and an inductor L7 which are mutually connected in series, the RF end is connected with a capacitor C7 in series and then grounded, meanwhile, the RF end is connected with one end of an inductor L3 in series, the other end of the inductor L3 is sequentially connected with an inductor L8 and a capacitor C11 in series, and a capacitor C8 is connected between the inductor L3 and the inductor L8 in series and then grounded; after the capacitor C11 is connected in series with the inductor L6, the end of the coil antenna 1 and the end of the coil antenna 2 are grounded; the capacitor C11 and the inductor L6 are grounded through the capacitor C10, and the inductor L6 and the coil antenna 1 are grounded through the capacitor C6.
2. The system of claim 1, wherein the chip FXTH871502DT1 is hard wired to the antenna circuit.
3. The system of claim 1, wherein the tire pressure monitoring unit uses a chip SX1239, and the chip SX1239 circuit is: pins 4 and 5 of the chip SX1239 are respectively connected with pins 1 and 3 of a crystal oscillator G10, pins 1 and 3 of a crystal oscillator G10 are respectively connected with a capacitor C44 and a capacitor C45 in series and then are grounded, and pin 2 of a crystal oscillator G10 is grounded; a pin 21 of the chip SX1239 is connected with a radio frequency receiving circuit; pin 2 of chip SX1239 is grounded through capacitors C24 and C81 which are connected in parallel, and pin 3 of chip SX1239 is grounded through capacitors C25 and C9 which are connected in parallel.
4. The system of claim 3, wherein the rf receiving circuit is connected in a manner that: a pin 21 of the chip SX1239 is connected with a receiving antenna after being connected with a capacitor C37 and a capacitor C38 in series, and the capacitor C37 and the capacitor C38 are grounded after being connected with a capacitor C39 in series; pin 21 of chip SX1239 is connected in series with inductor L21 and then grounded.
5. The system of claim 4, wherein one end of the receive antenna is grounded.
6. The system of claim 4, wherein the receiving antenna is an internal antenna or an external antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020323399.8U CN212073571U (en) | 2020-03-16 | 2020-03-16 | Tire pressure detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020323399.8U CN212073571U (en) | 2020-03-16 | 2020-03-16 | Tire pressure detection system |
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| Publication Number | Publication Date |
|---|---|
| CN212073571U true CN212073571U (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020323399.8U Active CN212073571U (en) | 2020-03-16 | 2020-03-16 | Tire pressure detection system |
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| CN (1) | CN212073571U (en) |
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