Mine vehicle tire pressure monitoring is based on non-destructive testing technology. By studying the real-time signal of vehicle tire pressure, the tire vehicle's tire pressure change characteristics are understood to provide a basis for mine vehicle safety monitoring. A study of a monitoring device for tire pressure with LPC2132 as the core is described. The vehicle tire pressure signal is collected by the sensor module with Bluetooth, and after the conditioning circuit is compared, the alarm is calculated, and if the value exceeds the specified value, the alarm is sent and the data is sent to the on-board CAN bus. Based on this, a set of Bluetooth-based tire pressure monitoring device is designed. The hardware system is mainly composed of sensor, LPC2132 processor, signal conditioning circuit, Bluetooth module and alarm module. The software system consists of a firmware program, a data transceiver module, and the like.
The development of the automotive industry and the importance people attach to the vehicle safety assurance system have made the automobile tire pressure monitoring system have a large market. Therefore, the mining vehicle company has also started to study this technology. Among the many factors that affect tire performance, tire pressure is an extremely important parameter. It has an important influence on the bearing performance, high speed performance, braking performance, anti-slip performance, durability and blast resistance of the tire.
Sensor circuit
In general, mining vehicles require 6-12 tire pressure monitoring system modules. In order to improve the system's receiving ability and anti-interference ability, we use MPXY8020A pressure temperature sensor, LPC2132 processor, Bluetooth wireless transceiver module and other major system solutions, the block diagram is shown in the figure.
LPC2132 master
The LPC2132 master is based on a 32ARM7TDMI-S CPU that supports real-time emulation and embedded trace with 64k of embedded high-speed flash memory. The 128-bit wide memory interface and unique acceleration structure allow 32-bit code to run at maximum clock rates. 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.
The LPC2132 main controller mainly works:
a. The data acquisition module communicates and converts and stores the collected pressure and temperature values. b. Communicate with the Bluetooth transceiver module and send the data to the CAN bus via Bluetooth.
Signal conditioning circuit
The LPC2132 controller's interrupt pin allows the LPC2132 controller to control the A/D converter to keep the input signal synchronized simultaneously. The voltage signal can be programmed by the LPC2132 controller according to the range of voltage signals to be collected, and the voltage does not exceed 3.3V. In order to make the voltage signal meet the effective acquisition interval of the LPC2132 controller development board, the voltage to be collected is required. Perform a step-down conversion, and add a Zener tube at the output of the conversion circuit for protection, as shown in Figure 4.
Considering that the transmission cannot be attenuated and transmitted to the original signal, high-resistance voltage divider can be used for the input. The circuit uses two 3K resistors to divide the voltage. The detection interface circuit shunt is less than 0.5mA, and the sensor incoming signal current is more than 100mA. Ignore, and the back end uses op amp isolation to follow the access, reducing the interference to the tire pressure monitoring system.
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