CN210295390U

CN210295390U - Remote signal transmission device applied to tire monitoring system

Info

Publication number: CN210295390U
Application number: CN201921093250.9U
Authority: CN
Inventors: 田海霞
Original assignee: Nanjing Top Sun Technology Co ltd
Current assignee: Nanjing Top Sun Technology Co ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-04-10
Anticipated expiration: 2029-07-12

Abstract

The utility model relates to a be applied to tire monitoring system's remote signal transmission device, including the box-packed device of signal reception, the controller center, be equipped with control MCU on the PCB circuit board of the box-packed device of signal reception, wireless radio frequency circuit, LIN communication circuit, LIN output interface, wireless radio frequency circuit is connected to control MCU's data input part, wireless radio frequency circuit passes through the sensor unit of radio frequency antenna connection tire, LIN communication circuit's data input part is connected to control MCU's data output part, LIN output interface is connected to LIN communication circuit's data output part, the controller center includes master control MCU, LIN input interface, LIN transceiver, LIN input interface connection LIN transceiver's data input part, LIN transceiver's data output part connects master control MCU's data input part, link to each other through the LIN bus between LIN output interface. The device can effectively realize real-time lossless remote transmission of tire monitoring data, has strong anti-interference performance and low realization cost, and is easy to popularize and use.

Description

Remote signal transmission device applied to tire monitoring system

Technical Field

The utility model relates to a tire pressure monitoring system equipment technical field especially relates to a tire monitoring system's for commercial vehicle remote signal transmission device.

Background

At present, a tire monitoring system of a commercial vehicle is mainly used for detecting parameters such as pressure, temperature, acceleration, voltage and the like of a vehicle tire, so that the related parameters of the tire are maintained in a labeling range, abnormal abrasion of the tire is reduced, the probability of tire burst and tire damage is reduced, and the oil consumption and the damage rate of vehicle parts are reduced. The existing tire pressure monitoring system monitors the pressure and temperature data of the tire in real time in a driving or static state through a plurality of sensing transmitters arranged on each tire, and transmits the data to a control center of the system in a wireless mode for data processing and display early warning. However, because the size of the commercial vehicle is large, the distance between the rear wheel of the vehicle and the cab of the vehicle head is long due to the large size of the commercial vehicle, and currently, signal transfer receiving boxes are mostly arranged on the front axle and the rear axle of the vehicle respectively to transfer detection data of sensor units on the rear wheel of the vehicle to a host in the cab of the vehicle head. However, the signal relay processing method has high structural complexity, high failure rate, large delay in the signal transmission process, and high implementation cost. Since a tire is far from a system control center, in order to improve real-time accuracy of data transmission, a signal relay and reception box device is generally added between a sensor unit of the tire and the control center, data of the sensor unit of the tire is directly received by the signal relay and reception box device, and then the data is finally transmitted to the control center by the signal relay and reception box device through bus communication methods such as RS485, RS232, CAN, and the like. However, the actual application occasion of the signal relay receiving box device is far worse than the normal environment, and due to the fact that the anti-interference capability of the bus communication modes such as RS485, RS232 and CAN are weak, the problems of data transmission delay, packet loss and the like exist after long-term use, and therefore the monitoring performance effect of the tire monitoring system on the tire state parameters is reduced.

Disclosure of Invention

An object of the utility model is to provide a remote signal transmission device of simple structure's being applied to tire monitoring system, but the device real-time reception is the wireless monitoring data that the sensor transmitter on the child sent to send the monitoring data to tire monitoring system's control center through wired LIN communication mode in real time, its interference killing feature is strong, and data transmission distance is far away, can guarantee data transmission's delay time, realizes with low costs.

In order to achieve the above object, the present invention adopts a technical solution that a remote signal transmission device applied to a tire monitoring system comprises a signal receiving box device and a controller center, wherein an input end of the signal receiving box device is connected with a sensor unit arranged on each tire by a wireless radio frequency, and an output end of the signal receiving box device is connected with an LIN line of a signal receiving end of the controller center through an LIN bus; the signal receiving box device comprises a receiving box body and a PCB circuit board arranged in the receiving box body, wherein a control MCU, a radio frequency circuit, an LIN communication circuit and an LIN output interface are arranged on the PCB circuit board, a data input end of the control MCU is connected with the radio frequency circuit, the radio frequency circuit is connected with a sensor unit inside a tire through a radio frequency antenna, a data output end of the control MCU is connected with a data input end of the LIN communication circuit, a data output end of the LIN communication circuit is connected with the LIN output interface, a controller center comprises a master control MCU, an LIN input interface and an LIN transceiver, the LIN input interface is connected with the data input end of the LIN transceiver, the data output end of the LIN transceiver is connected with the data input end of the master control MCU.

As an improvement of the utility model, the LIN communication circuit is designed by adopting an LIN transceiver TJA1028 with an integrated voltage stabilizer, TXD pins and RXD pins of the TJA1028 chip are respectively connected with an I/O port of a control MCU, an LIN pin of the TJA1028 chip is connected with an LIN output interface, a VBAT pin of the TJA1028 chip is connected with a first capacitor C28C14 in series and then grounded, an LIN pin of the TJA1028 chip is connected with a second capacitor in series and then grounded, a third capacitor is connected between a GND pin and a VBAT pin of the TJA1028 chip in series, an EN pin of the TJA1028 chip is connected with an I/O port of the control MCU, a VCC pin of the TJA1028 chip is connected with a 3.3V power supply, a RSTN pin of the TJA1028 chip is connected with the first resistor in series and then connected with the 3.3V power supply, a RXD pin of the TJA, a fourth capacitor and a fifth capacitor are connected in parallel between the 3.3V power supply and the first resistor, one end of the fourth capacitor and one end of the fifth capacitor are connected with the 3.3V power supply after being connected in parallel, and the other end of the fourth capacitor and the fifth capacitor are grounded.

As an improvement of the utility model, control MCU adopts 32 ARM treater STM32F103C8T6 chips to design, and the data output end of wireless radio frequency circuit is connected to the IO port of STM32F103C8T6 chips, wireless radio frequency circuit adopts the enhancement mode wireless control receiver TDA5235 that possesses high sensitivity and low-power consumption characteristic to design, and SDI, SDO, SCK and the NCS pin of TDA5235 chip all connect the IO port of control MCU, concatenates a crystal oscillator between XTAL1 and the 2 pins of TDA5235 chip, and the frequency of crystal oscillator is 21.9487 MHz.

As an improvement of the utility model, master control MCU adopts 32 ARM treater STM32F103C8T6 chips to design, LIN transceiver adopts LIN physical layer transceiver TJA1020 to design, the RXD pin and the TXD pin of TJA1020 chip connect master control MCU's I/O port, 5V power is connected after the RXD pin of TJA1020 chip establishes ties the third resistance, the LIN pin of TJA1020 chip connects the input interface, the NSCP pin of TJA1020 chip establishes ties the I/O port of connecting master control MCU after the fourth resistance, the I/O port of connecting master control MCU after the NWAKE pin establishes ties the fifth resistance, connect the 5V power after the INH pin of TJA1020 chip establishes ties the sixth resistance, the BAT pin of TJA1020 chip connects the 12V power on the one hand, on the other hand establishes ties the sixth electric capacity after ground connection, the LIN pin of TJA1020 chip establishes ties the seventh electric capacity after ground connection.

As an improvement of the utility model, be equipped with two wave filters among the radio frequency circuit, two wave filters all adopt surface mounting type ceramic filter SFECF10M7EA00S0-R0, and IFMIX _ INP pin and IFBUF _ IN pin of TDA5235 chip are connected respectively to the input of two wave filters, and IF _ OUT pin and IFBUF _ OUT pin of TDA5235 chip are connected respectively to the output of two wave filters.

As an improvement of the utility model, the radio frequency communication frequency that radio frequency circuit adopted is 433.92MHZ frequency channel, and radio frequency circuit receives the signal of 433.92MHZ frequency channel that the inside sensor unit of tire sent.

Compared with the prior art, the remote signal transmission device has the advantages of ingenious overall structure design, compact size and low implementation cost, and has strong anti-interference capability and obvious cost advantage relative to other remote communication by using the LIN bus as the wired long-distance transmission of the single bus as the data transmission mode between the signal receiving box device and the controller center; meanwhile, the input end of the signal receiving box device is in radio frequency connection with the sensor unit arranged on each tire, and the output end of the signal receiving box device is connected with the signal receiving end of the controller center through an LIN bus. The signal receiving box device is used as a signal relay station of the sensor unit, and long-distance nondestructive transmission is carried out on the tire pressure and tire temperature data of the tire monitored by the sensor unit, so that the performance stability and reliability of the tire monitoring system are greatly improved; in addition, the controller center is interconnected with the whole vehicle control bus through a CAN circuit, so that actual tire pressure and tire temperature data are displayed on an automobile instrument or a display in real time, a driver CAN master the state of the tire in real time, and the safe driving of the vehicle is ensured.

Drawings

Fig. 1 is a block diagram of the remote signal transmission device of the present invention.

Fig. 2 is a circuit diagram of LIN communication in the remote signal transmission device according to the preferred embodiment of the present invention.

Fig. 3 is a control MCU and peripheral circuit diagram of the remote signal transmission device according to the preferred embodiment of the present invention.

Fig. 4 is a diagram of a radio frequency circuit in a remote signal transmission device according to a preferred embodiment of the present invention.

Fig. 5 is a diagram of a LIN transceiver in a remote signal transmission device according to a preferred embodiment of the present invention.

Fig. 6 is a circuit diagram of a main control MCU in the remote signal transmission device according to the preferred embodiment of the present invention.

Fig. 7 is a radio frequency circuit diagram of a sensor unit connected to a signal receiving box device according to a preferred embodiment of the present invention.

Fig. 8 is a CAN circuit diagram of the controller center and the entire vehicle control bus according to the preferred embodiment of the present invention.

Detailed Description

For the purposes of promoting an understanding and appreciation of the invention, the invention will be further described and illustrated in connection with the accompanying drawings.

A remote signal transmission device applied to a tire monitoring system comprises a signal receiving box device and a controller center, wherein the input end of the signal receiving box device is in radio frequency connection with a sensor unit arranged on each tire, and the output end of the signal receiving box device is connected with an LIN wire of a signal receiving end of the controller center through an LIN bus. When the device is used, in order to improve the installation convenience, the signal receiving box device is arranged near a central shaft of a chassis of a commercial vehicle, a controller center is arranged in the vehicle head, and the controller center is interconnected with a whole vehicle control bus through a CAN circuit, so that the actual tire pressure and tire temperature data are displayed on an automobile instrument or a display in real time, a driver CAN master the state of a tire in real time, and the safe driving of the vehicle is ensured. In addition, the LIN bus is adopted in the device to be used as wired long-distance transmission of the single bus, the anti-interference capacity is high, and the device has the obvious cost advantage compared with other long-distance communication, so that the device has good popularization value.

As shown in fig. 1, the signal receiving box device comprises a receiving box body and a PCB circuit board arranged in the receiving box body, wherein a control MCU, a radio frequency circuit, an LIN communication circuit and an LIN output interface are arranged on the PCB circuit board, a data input end of the control MCU is connected with the radio frequency circuit, the radio frequency circuit is connected with a sensor unit of a tire through a radio frequency antenna, tire monitoring data transmitted wirelessly by the sensor unit is received through the radio frequency circuit and is forwarded to the control MCU for processing, a data output end of the control MCU is connected with a data input end of the LIN communication circuit, a data output end of the LIN communication circuit is connected with the LIN output interface, and the LIN communication circuit performs signal level conversion on the data transmitted by the control MCU so as to convert the data into level signals required by the LIN. The controller center comprises a master control MCU, an LIN input interface and an LIN transceiver, wherein the LIN input interface is connected with the data input end of the LIN transceiver, the data output end of the LIN transceiver is connected with the data input end of the master control MCU, the LIN output interface and the LIN input interface are connected through an LIN bus, and the LIN transceiver converts LIN signals received through the LIN input interface into TTL signals so as to be used for the master control MCU to perform data identification and processing.

Preferably, as shown in fig. 2, the LIN communication circuit is designed using a LIN transceiver TJA1028 with an integrated voltage regulator, where TJA1028 is a LIN 2.0/2.1/SAE J2602 transceiver with an integrated low dropout voltage regulator that can provide up to 70 mA and different versions of 3.3V and 5.0V. Additionally, TJA1028 provides strong electrostatic discharge (ESD) performance and can withstand high voltages on the LIN bus. To minimize current consumption, TJA1028 supports a sleep mode in which the LIN transceiver and voltage regulator power are off while still having the ability to wake up through the LIN bus. TXD pins and RXD pins of a TJA1028 chip are respectively connected with an I/O port of a control MCU, an LIN pin of the TJA1028 chip is connected with an LIN output interface, an LIN pin of the TJA1028 chip is connected with a second capacitor C15 in series and then is grounded, the battery and ground short-circuit protection is achieved, a third capacitor C14 is connected between a GND pin and a VBAT pin of the TJA1028 chip in series, the VBAT pin of the TJA1028 chip is connected with a first capacitor C28 in series and then is grounded, an EN pin of the TJA1028 chip is connected with an I/O port of the control MCU, a VCC pin of the TJA1028 chip is connected with a 3.3V power supply, an RSAT pin of the TJA1028 chip is connected with a first resistor R13 in series and then is connected with a 3.3V power supply, an RXD pin of the TJA1028 chip is connected with a second resistor R14 in series and then is connected with a 3.3V power supply, a fourth capacitor C15 and a fifth capacitor C16 are connected between the 3V power supply in parallel and the first.

It is further preferable that, as shown in fig. 3, the control MCU is designed by using a 32-bit ARM processor STM32F103C8T6 chip, which is a microcontroller based on ARM Cortex-M core s, the program memory capacity is 64KB, and the I/O port of the STM32F103C8T6 chip is connected to the data output terminal of the radio frequency circuit. As shown in fig. 4, the radio frequency circuit is designed by using an enhanced radio control receiver TDA5235 with high sensitivity and low power consumption, pins SDI, SDO, SCK, and NCS of the TDA5235 chip are all connected to an I/O port of a control MCU, a crystal oscillator is connected in series between XTAL1 and 2 pins of the TDA5235 chip, and the frequency of the crystal oscillator is 21.9487 MHz.

More preferably, the wireless rf circuit is provided with two filters, each of the two filters adopts a surface mount ceramic filter SFECF10M7EA00S0-R0, input terminals of the two filters are respectively connected to an IFMIX _ INP pin and an IFBUF _ IN pin of the TDA5235 chip, and output terminals of the two filters are respectively connected to an IF _ OUT pin and an IFBUF _ OUT pin of the TDA5235 chip.

It is further preferable that the radio frequency circuit employs a specific radio frequency communication frequency, the radio frequency communication frequency is 433.92MHZ frequency band, and the radio frequency circuit is interconnected with the radio frequency circuit of the sensor chip (as shown in fig. 7), so that the receiving antenna on the signal receiving box device can accurately receive the frequency band data containing the tire data detected by the sensor unit on the tire.

It is further preferred that the master MCU is designed with a 32-bit ARM processor STM32F103C8T6 chip, the LIN transceiver is designed with a LIN physical layer transceiver TJA1020, TJA1020 is the interface between the LIN host and the LIN transmission medium, the transmit data stream at protocol controller input pin TXD is converted to a bus signal by the LIN transceiver, and the receiver of electromagnetic radiation TJA1020 is limited in both level flip rate and waveform to reduce the amount of electromagnetic radiation that the receiver detects the data stream on the LIN bus and transmits it to the protocol controller transceiver through the RXD pin has a low power management mode that consumes little current in sleep mode and reduces power consumption in error mode, as shown in fig. 5 and 6. An RXD pin and a TXD pin of the TJA1020 chip are connected with an I/O port of the main control MCU, the RXD pin of the TJA1020 chip is connected with a 5V power supply after being connected with a third resistor R31 in series, an LIN pin of the TJA1020 chip is connected with an LIN input interface, an NSCP pin and an NWAKE pin of the TJA1020 chip are connected with an I/O port of the main control MCU after being connected with a fourth resistor R33 and a fifth resistor R35 in series respectively, an INH pin of the TJA1020 chip is connected with a sixth resistor R34 in series and then connected with the 5V power supply, a BAT pin of the TJA1020 chip is connected with the 12V power supply on one hand, on the other hand, the TJA pin of the TJA1020 chip is connected.

In addition, in practical application, in order to enable the controller center to be interconnected with the vehicle control bus, a CAN circuit is additionally arranged in the controller center, as shown in fig. 8, TJA1040 is adopted in the CAN circuit as the controller, wherein TXD and RXD pins of the TJA1040 chip are connected with an I/O port of the master control MCU, CANH and CANL pins of the TJA1040 chip are connected with a CAN port of the vehicle control bus, so that tire monitoring data processed by the master control MCU is transmitted to a vehicle instrument or a display, a driver CAN grasp the state of a tire in real time, and safe driving of the vehicle is ensured.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. A remote signal transmission device applied to a tire monitoring system is characterized in that: the device comprises a signal receiving box device and a controller center, wherein the input end of the signal receiving box device is in radio frequency connection with a sensor unit arranged on each tire, and the output end of the signal receiving box device is connected with an LIN wire of a signal receiving end of the controller center through an LIN bus; the signal receiving box device comprises a receiving box body and a PCB circuit board arranged in the receiving box body, wherein a control MCU, a radio frequency circuit, an LIN communication circuit and an LIN output interface are arranged on the PCB circuit board, a data input end of the control MCU is connected with the radio frequency circuit, the radio frequency circuit is connected with a sensor unit of a tire through a radio frequency antenna, a data output end of the control MCU is connected with a data input end of the LIN communication circuit, a data output end of the LIN communication circuit is connected with the LIN output interface, a controller center comprises a master control MCU, an LIN input interface and an LIN transceiver, the LIN input interface is connected with the data input end of the LIN transceiver, a data output end of the LIN transceiver is connected with the data input end of the master control MCU.

2. A remote signal transmission device applied to a tire monitoring system as claimed in claim 1, wherein the LIN communication circuit is designed by using a LIN transceiver TJA1028 with an integrated voltage regulator, TXD and RXD pins of the TJA1028 chip are respectively connected to an I/O port of a control MCU, a LIN pin of the TJA1028 chip is connected to a LIN output interface, a VBAT pin of the TJA1028 chip is connected in series to a first capacitor and then grounded, a LIN pin of the TJA1028 chip is connected in series to a second capacitor and then grounded, a third capacitor is connected in series between a GND pin and the VBAT pin of the TJA1028 chip, an EN pin of the TJA1028 chip is connected to the I/O port of the control MCU, a pin of the TJA1028 chip is connected to a 3.3V power supply, a RSTN pin of the TJA1028 chip is connected in series to the first resistor and then connected to a 3.3V power supply, a RXD pin of the TJA1028 chip is connected in series to the second resistor and then connected to the 3.3V power supply, a fourth capacitor and a fifth resistor are connected in parallel between the 3.3V power supply and the first resistor, one end of the fourth capacitor is connected with a 3.3V power supply after being connected with the fifth capacitor in parallel, and the other end of the fourth capacitor is grounded.

3. A remote signal transmission unit for a tire monitoring system as claimed in claim 2, wherein said control MCU is designed with a 32-bit ARM processor STM32F103C8T6 chip, the I/O port of the STM32F103C8T6 chip is connected to the data output of a radio frequency circuit, said radio frequency circuit is designed with a radio control receiver TDA5235, and the SDI, SDO, SCK and NCS pins of the TDA5235 chip are connected to the I/O port of the control MCU.

4. A remote signal transmission device for use in a tire monitoring system as claimed in claim 3, it is characterized in that the main control MCU is designed by adopting a 32-bit ARM processor STM32F103C8T6 chip, the LIN transceiver is designed by adopting an LIN physical layer transceiver TJA1020, an RXD pin and a TXD pin of a TJA1020 chip are connected with an I/O port of a master control MCU, an RXD pin of the TJA1020 chip is connected with a 5V power supply after being connected with a third resistor in series, an LIN pin of the TJA1020 chip is connected with an LIN input interface, an NSCP pin of the TJA1020 chip is connected with a fourth resistor in series and then connected with an I/O port of the master control MCU, an NWAKE pin is connected with a fifth resistor in series and then connected with an I/O port of the master control MCU, an INH pin of the TJA1020 chip is connected with a sixth resistor in series and then connected with a 5V power supply, a BAT pin of the TJA1020 chip is connected with a 12V power supply on one hand, on the other hand, the.

5. A remote signal transmitter unit for use IN a tire monitoring system as claimed IN claim 4, wherein said RF circuit includes two filters, each of the two filters is a surface mount ceramic filter SFECF10M7EA00S0-R0, the input terminals of the two filters are connected to IFMIX _ INP pin and IFBUF _ IN pin of the TDA5235 chip, and the output terminals of the two filters are connected to IF _ OUT pin and IFBUF _ OUT pin of the TDA5235 chip.

6. A remote signal transmission apparatus for use in a tire monitoring system as claimed in claim 5, wherein said radio frequency circuit uses radio frequency communication at 433.92MHz band, and receives signals at 433.92MHz band from the sensor units inside the tire.