A vehicle-mounted bus detection system and method

Abstract

The invention discloses a vehicle-mounted bus detection system and method, belonging to the technical field of vehicle bus detection. In the present invention, the MCU microcontroller module of the single-chip microcomputer system sends a bus detection instruction signal to the automobile ECU system through the OBDII interface, and the ECU system returns the bus status signal, and the MCU judges the returned status signal through a software program, and finally determines the bus type, and then proceeds Data communication, according to different bus return signals to judge the status of the car to correct the control of the car function. The invention provides a vehicle-mounted bus detection and driving circuit, realizes signal conversion and driving functions, and overcomes the problems of large volume and high price in the scheme of using relays in level switching, and at the same time solves the problem of large internal resistance and low driving ability of the signal analog switch. Poor problem, and has the advantages of simple structure and stable performance.

Description

technical field [0001] The invention relates to the technical field of vehicle bus detection, and more specifically, relates to a vehicle-mounted bus detection system and method. Background technique [0002] With the development of electronic technology level, many electronic systems continue to shift to lower voltage signal levels. The driving force behind this development trend is the need to reduce power consumption. At the same time, the correct signal level can ensure the reliable operation of the system. Due to the different development levels of each system, the uneven development of voltage reduction has brought a problem to the system designer. The key problem that must be solved - how to carry out reliable conversion between signal levels. [0003] In the new generation of electronic circuit design, the introduction of low-voltage logic often leads to the inconsistency of input / output logic in the system, which increases the complexity of system design. For exam...

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Problems solved by technology

Although the combination of transistors or resistors and diodes can achieve level shifting, the parasitic capacitance in the circuit affects the data transmission rate

[0004] After searching, there are many disclosures about the vehicle bus detection scheme based on CAN bus and K line, such as patent number 201110064569.0, titled: Intelligent Fault Diagnosis and Driving Behavior Analysis Driving Control Method and Device Patent, that is, the microcontroller passes the K The line driver is connected to the vehicle diagnostic interface to read the fault codes in the vehicle engine electronic control unit and analyze them into vehicle fault information; and the microcontroller is connected to the vehicle diagnostic interface through the CAN driver to collect real-time status information of the vehicle; When the OBD interface receives the bus signal for car diagnosis, there is a problem of reliable switching between high and low levels, and no effective solution has been retrieved.

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