Development of vehicle model identification system for vehicle conveyor lines based on RFID technology

Research on vehicle model identification technology

The vehicle final assembly conveyor line includes BDC (car body distribution center), BDC to interior lifting equipment, interior line skateboard conveyor line, interior to chassis lifting equipment, chassis spreader conveyor line, chassis to final line lifting equipment, and final floor Chain conveyor line. This article mainly studies the vehicle model identification system that converts interior lines to chassis lines.

1. Existing identification methods

The vehicle model identification system uses a laser photoelectric switch to detect the presence or absence of the car body (whether the body sheet metal blocks the light path of the laser photoelectric switch, when the light path is blocked it means there is body sheet metal, when the light path is not blocked it means there is no body sheet metal), and multiple groups of applications are used The photoelectric switch detects different parts of the car body, and finally the vehicle model is roughly determined by the combined state of the switch.

2. Existing communication and transfer forms of identification data

RFID communicates with third-party software and hardware through RS232, RS485, MODBUS RTU, and MODBUS TCP. Among them, the RS232 communication data volume is small and the distance is short (15 m), the RS485 communication data volume is small and the communication signal is easy to attenuate, and the MODBUS communication format is relatively backward.

3. Problems with existing technology

1) The identification results of traditional photoelectric switch identification methods have poor accuracy. The photoelectric switch identifies some features of the car body to initially determine the vehicle model. The specific vehicle model cannot be accurately determined, which may lead to vehicle model identification errors.

2) The traditional photoelectric switch identification method has poor identification compatibility. When new models are introduced into the production line, photoelectric switches need to be added or adjusted, and they are not compatible with more models.

3) The traditional RFID communication form is incompatible with the SGMW vehicle production line PLC and cannot be quickly integrated into the PLC system.

4) The traditional RFID communication format has small data volume, low communication rate, and low reliability. Traditional photoelectric switches identify vehicle models with incomplete information and are not sufficient to meet on-site needs. Therefore, it is necessary to develop and study an identification system that is more suitable for the field.

Based on RFID body code identification

The storage in the RFID tag is divided into EPC area and USER area. The vehicle body information is stored in the EPC area. Due to the limited amount of data stored in the UHF tag (EPC can only store 12 bytes, that is, 12-bit characters).

Industrial Ethernet communication based on the EtherNet IP protocol allows domestic RFID to directly match Rockville PLC through software and hardware, reducing gateway links and reducing communication failure rates. At the same time, it increases the communication rate and enhances the anti-interference ability, which is a good example for IOT ( Internet of Things) provides the basic conditions.

The RFID vehicle model identification system has been put into use, which can effectively identify vehicle models and control the vehicle body delivery position based on the vehicle model identification results. The use effect is good, and the recognition success rate is 99.9%.

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