Abstract: Mine vehicle tire pressure monitoring is based on non-destructive testing technology. By studying the real-time signal of vehicle tire pressure, we can understand the change characteristics of mine vehicle tire pressure, so as to provide a basis for mine vehicle safety monitoring. The research of the tire pressure monitoring device with LPC2132 as the core is described. The vehicle tire pressure signal is collected through the sensor module with Bluetooth, and compared and calculated after the conditioning circuit. If it exceeds the specified value, it will alarm and send the data to the on-board CAN bus. On this basis, a set of Bluetooth-based tire pressure monitoring device is designed. The hardware system is mainly composed of sensors, LPC2132 processor, signal conditioning circuit, Bluetooth module and alarm module. The software system is composed of firmware programs, data transceiver modules and so on.
The development of the automobile industry and people's emphasis on automobile safety and security systems have made automobile tire pressure monitoring systems have a large market. Therefore, mining vehicle companies have also begun to study this technology.
Among the many factors that affect tire performance, tire air pressure is an extremely important parameter. It has an important influence on the load-bearing performance, high-speed performance, braking performance, anti-floating performance, durability and blast resistance of the tire.
1 Scheme of mine vehicle tire pressure monitoring system
Mine vehicle tire pressure monitoring system is mainly used for real-time monitoring of tire pressure during vehicle driving, and alarming of tire leakage and high and low air pressure to ensure driving safety. Use the pressure sensor installed in each tire with a lithium battery as the power source to directly measure the tire air pressure, and transmit it to the CAN bus through the Bluetooth module. When the tire pressure is too low, leakage, too high, the temperature is too high or the pressure of each tire is not balanced, the system will automatically alarm, as shown in Figure 1.
Figure 1 Block diagram of the tire pressure monitoring system
The functions of mine tire pressure monitoring system are as follows:
(1) Real-time monitoring of the pressure and temperature of each tire; (2) The upper and lower limits of the pressure and temperature alarm of each tire can be set; (3) The working status of each tire can be judged.
Under normal circumstances, the tire pressure monitoring system is a low-power mode. At regular intervals, the tire pressure monitoring system activates and enters the normal working mode after receiving the Bluetooth signal through the low-frequency activation Bluetooth transceiver, and then performs the tire pressure and temperature Data acquisition, transmitting data as a Bluetooth signal. If the received measurement data exceeds the set standard range, the solenoid pressure is controlled by an electromagnetic relay to adjust the tire pressure according to a specific algorithm, and the automatic inflation and deflation function is realized.
At the same time, when the tire pressure is too low, too high or the temperature is too high, the system will automatically alarm.
2 Hardware circuit
2.1 Sensor
Generally, mining vehicles require 6-12 tire pressure monitoring system modules. In order to improve the receiving ability and anti-interference ability of the system, we use MPXY8020A pressure and temperature sensor, LPC2132 processor, Bluetooth wireless transceiver module and other main components of the system program, the structural block diagram shown in Figure 2.
Figure 2 MPXY8020A sensor interface diagram
2.2 LPC2132 main controller
The LPC2132 main controller is based on a 32ARM7TDMI-S CPU that supports real-time simulation and embedded tracking, and has a 64k embedded high-speed flash memory. The 128-bit wide memory interface and unique acceleration structure enable 32-bit code to run at the maximum clock rate. Multiple 32-bit timers, 1 or 2 10-bit 8-channel ADCs, 10-bit DACs, PWM channels, 47 GPIOs, and 9 edge or level-triggered external interrupts make them suitable for this system.
As shown in Figure 3.
Figure 3 LPC2132 main controller chip
The main work of LPC2132 main controller:
a. The data acquisition module communicates to convert and store the collected pressure and temperature values.
b. Communicate with the Bluetooth transceiver module and send the data to the CAN bus via Bluetooth.
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