The door pressure tester is a portable hand-held structure. It is composed of a special pressure test sensor and a test management system. It is specially used to detect the closing force of the passenger compartment of the subway vehicle, the detection of the minimum obstacle, and the detection of the anti-pinch protection function of the door. The equipment can set and record the number of times, time and test items. The system can automatically and effectively complete the test requirements and automatically record the test results.
The vehicle door, especially the door of a high-speed running vehicle such as a train, is a product with high safety performance requirements, and its performance indicators must be kept within a relatively safe range of values ​​to ensure the safe operation of the vehicle. This not only requires the manufacturer to test these parameters in the product manufacturing process, but also needs to detect these parameters during the inspection and maintenance process after the product is put into use, providing necessary reference information for the safe use of the product; The development of testing instruments is not enough. The usual testing methods are mainly assisted by the inspectors with the help of a variety of hand tools.
At present, the detection method of the door pressure is mostly detected by the inspection personnel by means of hand tools. The main defects of this detection method are: 1) the test device is cumbersome, portable and inconvenient to operate; 2) the test data must be manually recorded, and the information exchange is inconvenient; 3) The test is based on manual experience, the test accuracy is not guaranteed; 4) the safety is poor; 5) the test efficiency is low.
The portable door pressure detector developed in this paper is composed of special pressure test sensor and test management system, which is specially used to detect the closing force of the passenger compartment of the subway vehicle, the detection of the minimum obstacle, and the detection of the anti-pinch protection function of the door. The equipment can set and record the number of times, time and test items. The system can automatically and effectively complete the test requirements and automatically record the test results. The device uses a USB mode job dump interface.
1 overall planThis system is composed of ATmega32 as the main control chip of the main control board. The design includes a pressure acquisition system, a control interface and display system, a power supply system, a data storage and data import module, and an abnormality alarm module. The main system block diagram is shown in Figure 1.
The Atmega32 MCU is an 8-bit MCU based on AVR R ISC, low-power COMS. Due to the execution of one instruction in one clock cycle, Atmega32 MCU can achieve performance close to 16M IPS/MHz. Its main performance is as follows:
1) High performance, low power 8-bit AVR microcontroller;
2) Advanced R ISC reduced instruction set structure, 130 powerful instructions, most of which are executed in a single clock cycle, with on-chip hardware multipliers with an execution time of two clock cycles;
3) On-chip 32K bytes of online self-programming FLASH (1 000 times of erasing), 1024 bytes of EEPROM (100 000 times of erasing), 2K bytes of internal SRAM, and program encryption function;
4) Two 8-bit timer/counters with prescaler and one compare mode, one with prescaler and compare mode, 16-bit timer/counter for capture mode, with counting function and independent oscillator Real-time clock (RTC); 4-channel PWM channel; 8-channel A/D converter, including: 6 10-bit conversion precision channels, 2 8-bit conversion precision channels; Programmable gate with on-chip crystal Dog timer; on-chip analog comparator;
5) Typical microcontroller features: power-on reset and programmable undervoltage detection; internally calibratable RC oscillator; external and internal interrupt sources totaling 18;
6) High speed and ultra low power consumption.
In ATMEL's microcontroller family, ATmega32 is a very special microcontroller. It uses Harvard structure. The chip integrates large-capacity memory and rich hardware interface circuit. It is high-speed, low-power, low-cost, and is very suitable for use. Design a portable door pressure detector device.
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