Automotive CAN bus simulation development tool Chengdu Panfeng Technology

What is a car driving recorder? Chengdu Panfeng Technology Congratulations reminds everyone: the car driving recorder is installed on the vehicle and can record, store, display and print the vehicle's running speed, time, mileage and other status information about the vehicle's driving, and can realize data output through the interface Digital electronic recording device, commonly known as automobile black box. When everyone does not fasten their seat belts, is there always a sound reminding you? What is a car driving recorder? Chengdu Panfeng Technology reminds everyone: the car driving recorder is installed on the vehicle and can record, store, display, and print the vehicle's running speed, time, mileage, and other status information about the vehicle's driving, and can realize digital data output through the interface. Electronic recording device, commonly known as automobile black box. When everyone does not fasten their seat belts, is there always a sound reminding you? ? Yes, this is the driving recorder that brings more safety to everyone. The use of car driving recorders can curb traffic violations such as fatigue driving and speeding, restrain drivers’ bad driving behaviors, ensure vehicle driving safety and road traffic accidents. The analysis and identification play an important role. The car driving recorder (hereinafter referred to as the recorder) is composed of the host part of the car driving recorder and the data analysis software part of the computer terminal. So what is the relationship between the car driving recorder and the bus? The host part is the core of the recorder, which mainly completes the collection, recording and storage of vehicle driving data. Traditional car driving recorders have a lot of sampling signals, and signal collection is very complicated and requires a lot of connecting lines. In order to ensure the accuracy of the collected signals, the collected signals must be processed by amplification circuits and filtering circuits. If the circuits at all levels Poor matching of electrical characteristics will affect the accuracy of the recorder signal collection, and sometimes even affect the normal operation of other car systems.
What are the benefits of car bus? The data analysis software of the computer terminal mainly realizes the analysis and processing of data such as speed and pressure during vehicle driving. Therefore, the signals collected by the recorder must be transmitted with the computer terminal, peripheral alarm module, human-machine interface module, etc. Standard R3 serial communication is a mature and stable communication method, and it is also a must-have communication method stipulated by the national standard for automobile driving recorders. However, the R3 serial communication distance is short and can only perform point-to-point communication, and cannot directly establish a multi-point communication network. In order to extend the communication distance of R3 and form a communication network with R3 nodes, it is necessary to convert the R3 serial communication interface into a bus interface to form a remote multi-point communication network in the form of a bus.
The application of the bus enables the car driving recorder to directly read the corresponding signals from the bus through the interface, so it will not affect the normal operation of other systems. At the same time, the bus has the advantage of high reliability of data transmission, which also makes its data accuracy be protected. The bus transceiver uses a standard high-speed transceiver, which is the interface between the protocol controller and the physical bus. It can provide differential transmit performance for the bus and differential receive performance for the controller. In addition to enhancement, another important feature is that the bus exhibits passive characteristics when not powered on. This results in significantly better performance than other bus transceivers.
There are high-speed and silent operating modes, both controlled by pins. High-speed mode can be entered by connecting the pin to ground. Since the pin has an internal pull-down function, high-speed mode is also the default mode when it is not connected. In high-speed mode, the bus output signal has a fixed frequency and switches as fast as possible for the maximum bit rate and maximum bus length. Connect the pin high to enter silent mode. In silent mode, the transmitter is disabled regardless of the input signal. Therefore, in the non-transmitting state, it consumes the same supply current as in the invisible state. The lowest baud rate is b/.