RU219459U1 - Service and diagnostic device for the wheel condition monitoring system - Google Patents

Abstract

The utility model relates to the field of radio electronics, in particular to devices for diagnosing and adjusting the components that make up the system for monitoring the condition of the wheels of vehicles, including trucks. The technical problem is the creation of a service diagnostic device that makes it possible to transfer information packets to the wheel module, receive information about successful data download, as well as about the sensor identification number without the need to dismantle the wheel module, thereby increasing the speed of the wheel condition monitoring process on vehicles. The technical result is the reduction of time resources for the implementation of the process of monitoring the condition of the wheels on vehicles. To do this, the service diagnostic device contains a voltage regulator, the output of which is connected to the input of the microcontroller, a low-frequency antenna, the input of which is connected to the output of the microcontroller. The low-frequency antenna has a microcontroller-controlled driver capable of converting the data received from the microcontroller. At the same time, the low-frequency antenna is configured to transmit the converted data via the simplex interface at a frequency of 125 kHz. In addition, the service diagnostic device contains a data display unit, the input of which is connected to the outputs of the voltage regulator and the microcontroller, as well as a wireless radio frequency transceiver capable of receiving data received from sensors via a simplex interface at a frequency of 434 MHz. 1 ill.

Description

The utility model relates to the field of radio electronics, in particular to devices for diagnosing and adjusting the components that make up the system for monitoring the condition of the wheels of vehicles, including trucks.

The prior art service-diagnostic devices for systems monitoring the condition of the wheels, described, for example, in the sources JP 5182030 B2, B60C 23/04, G01L 17/00, publ. 04/10/2013, as well as in the RF patent for the invention RU 2543131 C1, B60C 23/02, B60C 23/04, G01L 17/00, G08C 17/02, publ. 02/27/2015.

The service diagnostic device according to patent RU 2543131 C1 is taken as a prototype and is a receiver placed on the vehicle body, which provides for receiving data from modules (sensors) installed inside the wheel and their further processing.

Known solutions do not have the ability to update the software of the sensor (wheel module) installed inside the wheel without dismantling it, and also do not provide for the implementation of diagnostics and control of the scheme for assigning a wheel module identifier to a specific wheel position by a service diagnostic device.

Thus, the technical problem is the creation of a service diagnostic device that makes it possible to transfer information packets to the wheel module, receive information about successful data download, as well as about the sensor identification number without the need to dismantle the wheel module, thereby increasing the speed of the wheel condition monitoring process on vehicles.

The technical result is the reduction of time resources for the implementation of the process of monitoring the condition of the wheels on vehicles.

The technical problem is solved due to the fact that the service diagnostic device contains a voltage regulator, the output of which is connected to the input of the microcontroller, a low-frequency antenna, the input of which is connected to the output of the microcontroller, containing a driver controlled by the microcontroller, configured to convert the data received from the microcontroller, while the low-frequency antenna is configured to transmit the converted data via a simplex interface at a frequency of 125 kHz, in addition, the service diagnostic device contains a data display unit, the input of which is connected to the outputs of the regulator and a voltage and a microcontroller, as well as a wireless radio frequency transceiver configured to receive data received from sensors via a simplex interface at a frequency of 434 MHz.

Supplying the device with a low-frequency antenna driver, which is controlled by a microcontroller, configured to convert data in order to transmit them over a low-frequency simplex interface at a frequency of 125 kHz, allows, when deploying a wheel condition monitoring system on a vehicle, to transmit information packets via a low-frequency simplex interface from the service device to the sensor installed in the wheel module, containing commands that run in the sensors an algorithm that allows you to assign the identification number of the sensor to the wheel on which it is installed. Thus, the claimed device allows to increase the speed of vehicle servicing, respectively, to reduce the time resources for the implementation of the monitoring procedure, since the process of assigning a sensor identification number is carried out without dismantling the wheel module.

The data display unit, the input of which is connected to the outputs of the step-down transformer and the microcontroller due to the fact that it allows the operator to observe the status bar of information loading into the wheel module sensor, also helps to increase the speed of monitoring the condition of the vehicle's wheels and, accordingly, reduce the time resources for the process of monitoring the condition of the wheels on vehicles.

The presence in the claimed device of a wireless RF transceiver capable of receiving data received from sensors via a high-frequency simplex interface at a frequency of 434 MHz allows you to quickly receive confirmation from the sensors about the successful download of data, which also helps to increase the speed of monitoring and reduce the time resources spent on this procedure.

The essence of the technical solution is illustrated by the diagram.

In FIG. 1 shows a block diagram of a service diagnostic device for a wheel condition monitoring system.

The service diagnostic device contains a voltage regulator 1, the output of which is connected to the input of the microcontroller 2.

Voltage regulator 1 converts a constant unregulated voltage of one value into a smaller, stabilized one to protect the digital circuit from overvoltage and compensate for changes in the supply voltage during battery discharge. In addition, in order to keep the battery charge for a long time in the off state of the device, the voltage regulator 1 must have a minimum own consumption current.

Thus, any voltage regulator known from the prior art can be used in the proposed device, which has the following characteristics: input voltage range 2.5-5 V, output voltage 2.8 V, voltage drop no more than 250 mV, internal consumption current no more than 20 μA, operating temperature range from -40°C to +70°C, for example, models: LP5907MFX-2.8, TPS78228, etc.

Also, any microcontroller 2 known from the prior art can be used to implement the device, having the following characteristics: built-in PWM signal generator, built-in analog-to-digital converter, SPI, I2C interfaces, program ROM size should be at least 64 kb, RAM size should be at least 10 kb, LQFP48 or UFQFPN48 package, operating temperature range from -40°C to +70°C, current consumption in sleep mode no more than 20 μA . For example, models: STM32F103C8, STM32F103CB, STM32L151C8, STM32L151CC, STM32F103C8, GD32E103CB, etc.

In this case, the microcontroller 2 contains a control program, which can also be written to the microcontroller 2 via the universal USB 3 port.

The low-frequency antenna driver 4, controlled by the microcontroller 2, is configured to convert data in order to transmit them over the low-frequency simplex interface 5 at a frequency of 125 kHz.

To do this, the data, namely, the unique identification number of the sensor and the value corresponding to the command to wake up the wheel module, are converted into a Manchester code, based on which the PWM modulator of the microcontroller 2 generates a signal at a frequency of 125 kHz. Further, the modulated signal is amplified by a key, which can be used as a field-effect transistor and fed to a low-frequency antenna 4.

To implement the device, loop-type antennas (coils) with a resonant frequency of 125 kHz, widely available on the market, for example, the LF50M351J-125K-AC antenna, can be used.

By changing the duty cycle of the PWM modulation, it is possible to change the power supplied to the low-frequency antenna in the range of 0.2-0.4 W. This allows you to change the range of 30-70 cm during operation of the device. To amplify the signal, you can use, for example, the MIC4422 driver.

Due to the fact that the low-frequency simplex interface 6 has a limited range of about 30-70 cm, it does not affect other sensors of the pressure control system that are installed in adjacent wheel modules.

The device also contains a data display unit 7, the input of which is connected to the outputs of the voltage regulator 1 and the microcontroller 2.

To implement the device, monochrome OLED or liquid crystal displays with a resolution of 128×64 pixels can be used.

The wireless radio frequency transceiver 6, tuned to a frequency of 434 MHz, is configured to receive data received from sensors (wheel modules) via a high-frequency simplex interface at a frequency of 434 MHz.

The high-frequency simplex interface is implemented using the transceiver chip 6. Signal reception and data processing is performed at the hardware level in the transceiver chip 6, then the prepared decoded data is transmitted to the microcontroller 2 via the SPI interface.

FSK modulation is used for data transmission (Golikov A.M. “Coding in radio-electronic information transmission systems”, 2018. p. 30, https://edu.tusur.ru/publications/8766/download).

To implement the device, any transceiver known from the prior art can be used, which has the following characteristics: data reception at a frequency of 434 MHz, FSK modulation, data transfer rate of 19200 baud, deviation of 90 kHz, buffer size of at least 32 bytes, for example, RA-01, SX1276, CC1101, etc.

The service diagnostic device works as follows.

The claimed service and diagnostic device is used when deploying a system for monitoring the condition of the wheels, in particular, when replacing sensors (wheel modules), as well as when rearranging the wheels. In addition, the service diagnostic device is used if it is necessary to install a new version of the software in the wheel modules.

After turning on the service and diagnostic device, the mode of binding the sensor to the wheel scheme is entered on the screen of the data display unit. After that, an input voltage of 5-18 V is applied to the input of the voltage regulator 1, the value of which is converted to 3.3 V and then fed to the input of the microcontroller 2.

Further, the data, namely, the unique identification number of the sensor and the value corresponding to the command to wake up the wheel module, are converted into a Manchester code, based on which the PWM modulator of the microcontroller 2 generates a signal at a frequency of 125 kHz. After that, the modulated signal is amplified and fed to a low-frequency antenna 4. Further, the signal is transmitted via a low-frequency simplex interface 4 at a frequency of 125 kHz to a sensor (wheel module) located in the vehicle wheel in order to transmit a command to wake up the wheel module. After that, the service diagnostic device, using a wireless radio frequency transceiver 6 tuned to a frequency of 434 MHz, receives data containing the identification number of the sensor and associates it with the position of the wheel diagram on the screen of the data display unit 7.

To carry out the procedure for linking the sensor to the wheel diagram, which is reflected on the monitor (in the data display unit), the service and diagnostic device is brought to the wheel with the pressure sensor installed at a distance of 30-70 cm.

The process of installing the software on each wheel module is carried out in the same way, for which the corresponding mode is set. At the same time, the wireless RF transceiver 6, tuned to a frequency of 434 MHz, allows you to receive information confirming the successful download of data to each wheel module. A successful transfer will result in an operation mode flag of 0x0B in the message from the wheel module.

In addition, the wireless radio frequency transceiver 6, tuned to 434 MHz, allows you to receive additional information from the wheel modules, namely, tire pressure, temperature, battery voltage.

Thus, the service diagnostic device is able to transfer information packets to the wheel module, as well as receive feedback from the wheel module, without the need to dismantle it, thereby increasing the speed of the process of monitoring the condition of the wheels on vehicles and reducing the time spent on the procedure.

Claims (1)

Service and diagnostic device containing a voltage regulator, the output of which is connected to the input of the microcontroller, a low-frequency antenna, the input of which is connected to the output of the microcontroller, containing a driver controlled by the microcontroller, configured to convert the data received from the microcontroller, while the low-frequency antenna is configured to transmit the converted data via a simplex interface at a frequency of 125 kHz, in addition, the service diagnostic device contains a data display unit, the input of which is connected to the outputs of the voltage regulator and the microcontroller, as well as a wireless radio frequency transceiver configured to receive data received from sensors via a simplex interface at a frequency of 434 MHz.