With the rapid development of the economy and the improvement of people's living standards, the number of domestic car ownership continues to increase, and automobiles have become an indispensable means of transportation in people's lives. The accompanying problem is the frequent occurrence of car theft cases, and car theft has received more and more attention. At present, the common car anti-theft systems are divided into: mechanical anti-theft system, electronic anti-theft system, and network anti-theft system. The overall framework of the vehicle anti-theft system hardware is as shown.
Vehicle anti-theft system hardware overall framework 2.2 vehicle anti-theft system hardware design The vehicle anti-theft system's microcontroller module uses Infineon XC866 model MCU, XC866 adopts XC800 core design compatible with industry standard 8051 processor. The XC866 is highly integrated with on-chip devices, such as an on-chip oscillator or an embedded voltage regulator (and thus can be powered from a single 3.3V or 5.0V supply), providing many enhancements to meet new applications. Other key features of the XC866 include: a capture/compare unit 6 (CCU6) for generating pulse width modulated signals, a dedicated mode with motor control, and a 10-bit analog-to-digital converter (ADC) with automatic scanning and result accumulation (using Extended functionality such as anti-aliasing filtering or averaging); a function-extended Universal Asynchronous Receiver Transmitter (UART) that supports local interconnect network (LIN) applications and provides LIN's underlying driver software for many devices; providing different power savings Mode selection for low-power applications; its rich on-chip peripheral functions are controlled by Special Function Registers (SFRs), which use an intelligent paging mechanism (optimized interrupt handling) to extend the SFR address range. The fingerprint module transmits and receives data with the main control unit XC866 through the RS232 interface, and the XC866 controls the fingerprint module by means of asynchronous reception by the UART. This design uses an RFID system as a coil module to identify the key anti-theft code. RFID technology is an automatic identification system that uses non-contact two-way communication using radio waves or microwave energy to realize identification and data exchange functions. This design adopts ATS125K non-contact RF ID card special module, which uses advanced RF receiving circuit and embedded microcontroller design, combined with efficient decoding algorithm, completes data reception of EM4100, TK4100 compatible ID card, with receiving sensitivity. High, low operating current and high stability.
2.3 Vehicle anti-theft system software design According to the system design strategy, the whole fingerprint identification process is carried out on the fingerprint module, and the peripheral related control is performed on the micro-control module. The microprocessor of the microprocessor and the fingerprint module is used as a dual system processor. The DSP of the microprocessor and the fingerprint module exchanges instructions and data through a serial communication interface (such as RS232, USB).
The main working principle of the vehicle anti-theft system is: after the user enters the car, insert the car key, turn the car key to the ON block, the car battery powers the fingerprint anti-theft main control unit and the anti-theft coil RFID module; the anti-theft coil RFID module receives the key chip transmission Anti-theft identification code; the user enters the fingerprint on the fingerprint device; when the fingerprint verification is successful and the anti-theft code is successfully verified, the anti-theft main control unit closes the relay, the ignition circuit is turned on, and the car starts normally; when the fingerprint verification fails or the anti-theft code fails to be verified, The relay continues to open and the car cannot start.
The vehicle anti-theft system software design flow chart is as shown.
Tested: The anti-theft system based on fingerprint identification technology can complete the whole work process in a variety of environments, can meet the actual needs, has a strong research and development relay controller prototype and loading test chart research and development - The vehicle successfully started 4 Conclusions In view of the problems existing in the car anti-theft technology, the biometric identification technology was introduced, and a new vehicle anti-theft system with strong vehicle association and driver identity was designed. The system adopts embedded technology and applies biometric technology to the car anti-theft system. The micro-controller is the main control unit and the fingerprint module is the sub-unit. The uniqueness and immutability of the human fingerprint feature are utilized, and only the fingerprint authentication is successful. In this case, the car engine can be started. Using Infineon's automotive-grade MCU-XC866 as the core component of the main control unit and embedded C language as the development tool, the software and hardware system of the vehicle anti-theft system based on fingerprint identification technology was designed, and the fingerprint based on the development of Zhidou electric vehicle was made. Identify the prototype of the vehicle anti-theft system. Finally, the laboratory module test and real vehicle function and performance test are carried out on the developed system. The test results show that the system achieves the established target function, and has strong robustness and scalability for future engineering development. And promotion and application have a strong guiding significance.
Vehicle anti-theft system hardware overall framework 2.2 vehicle anti-theft system hardware design The vehicle anti-theft system's microcontroller module uses Infineon XC866 model MCU, XC866 adopts XC800 core design compatible with industry standard 8051 processor. The XC866 is highly integrated with on-chip devices, such as an on-chip oscillator or an embedded voltage regulator (and thus can be powered from a single 3.3V or 5.0V supply), providing many enhancements to meet new applications. Other key features of the XC866 include: a capture/compare unit 6 (CCU6) for generating pulse width modulated signals, a dedicated mode with motor control, and a 10-bit analog-to-digital converter (ADC) with automatic scanning and result accumulation (using Extended functionality such as anti-aliasing filtering or averaging); a function-extended Universal Asynchronous Receiver Transmitter (UART) that supports local interconnect network (LIN) applications and provides LIN's underlying driver software for many devices; providing different power savings Mode selection for low-power applications; its rich on-chip peripheral functions are controlled by Special Function Registers (SFRs), which use an intelligent paging mechanism (optimized interrupt handling) to extend the SFR address range. The fingerprint module transmits and receives data with the main control unit XC866 through the RS232 interface, and the XC866 controls the fingerprint module by means of asynchronous reception by the UART. This design uses an RFID system as a coil module to identify the key anti-theft code. RFID technology is an automatic identification system that uses non-contact two-way communication using radio waves or microwave energy to realize identification and data exchange functions. This design adopts ATS125K non-contact RF ID card special module, which uses advanced RF receiving circuit and embedded microcontroller design, combined with efficient decoding algorithm, completes data reception of EM4100, TK4100 compatible ID card, with receiving sensitivity. High, low operating current and high stability.
2.3 Vehicle anti-theft system software design According to the system design strategy, the whole fingerprint identification process is carried out on the fingerprint module, and the peripheral related control is performed on the micro-control module. The microprocessor of the microprocessor and the fingerprint module is used as a dual system processor. The DSP of the microprocessor and the fingerprint module exchanges instructions and data through a serial communication interface (such as RS232, USB).
The main working principle of the vehicle anti-theft system is: after the user enters the car, insert the car key, turn the car key to the ON block, the car battery powers the fingerprint anti-theft main control unit and the anti-theft coil RFID module; the anti-theft coil RFID module receives the key chip transmission Anti-theft identification code; the user enters the fingerprint on the fingerprint device; when the fingerprint verification is successful and the anti-theft code is successfully verified, the anti-theft main control unit closes the relay, the ignition circuit is turned on, and the car starts normally; when the fingerprint verification fails or the anti-theft code fails to be verified, The relay continues to open and the car cannot start.
The vehicle anti-theft system software design flow chart is as shown.
Tested: The anti-theft system based on fingerprint identification technology can complete the whole work process in a variety of environments, can meet the actual needs, has a strong research and development relay controller prototype and loading test chart research and development - The vehicle successfully started 4 Conclusions In view of the problems existing in the car anti-theft technology, the biometric identification technology was introduced, and a new vehicle anti-theft system with strong vehicle association and driver identity was designed. The system adopts embedded technology and applies biometric technology to the car anti-theft system. The micro-controller is the main control unit and the fingerprint module is the sub-unit. The uniqueness and immutability of the human fingerprint feature are utilized, and only the fingerprint authentication is successful. In this case, the car engine can be started. Using Infineon's automotive-grade MCU-XC866 as the core component of the main control unit and embedded C language as the development tool, the software and hardware system of the vehicle anti-theft system based on fingerprint identification technology was designed, and the fingerprint based on the development of Zhidou electric vehicle was made. Identify the prototype of the vehicle anti-theft system. Finally, the laboratory module test and real vehicle function and performance test are carried out on the developed system. The test results show that the system achieves the established target function, and has strong robustness and scalability for future engineering development. And promotion and application have a strong guiding significance.
Incremental encoders provide speed, direction and relative position feedback by generating a stream of binary pulses proportional to the rotation of a motor or driven shaft. Lander offers both optical and magnetic incremental encoders in 4 mounting options: shafted with coupling, hollow-shaft, hub-shaft or bearingless. Single channel incremental encoders can measure speed which dual channel or quadrature encoders (AB) can interpret direction based on the phase relationship between the 2 channels. Indexed quadrature encoders (ABZ) are also available for homing location are startup.
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