Automotive CAN bus simulation development tool Chengdu Panfeng Technology

In automotive technology, power supply selection is one of the important factors related to the stable operation of the system, and it is also an important step for the successful application of the instrument. The power supply when the car stops and starts comes from the battery on the car, and the car battery is + (electric system for cars, and electric system for trucks and heavy trucks). When starting and running, the generator and battery are connected in parallel to supply power to the electrical devices. The voltage fluctuation range is. In the internal circuit of the instrument, the LCD backlight, buzzer, and each function indicator light (light-emitting diode) are, the microcontroller chip internally uses 3 voltages, the knife port and the external power supply voltage are, and other electrical components such as R are, so it is reliable Power conversion is also a key technology for the successful application of this instrument. Since the load changes greatly when the car is working, the voltage fluctuation range is large, and most of the devices used in this system are powered by +, their driving currents are relatively small, and the conversion reference voltage requires a relatively stable voltage. Bus interface module design
Each node needs to be connected to the car bus through a transceiver chip on the physical layer. The transceiver can provide the required high current drive and can provide current protection from faulty nodes.
Pulse signal processing circuit
Vehicle speed sensors include Hall-type non-contact sensors, magnetoelectric sensors, photoelectric sensors, etc. Their working principle is to continuously send out pulse signals while the vehicle is driving. to deliver relevant information. The working principle of the photoelectric sensor is that it is driven by a conventional speedometer flexible shaft. The flexible shaft drives a wheel with a square hole (, etc.) to rotate between the light-emitting diode and the photosensitive diode. As the wheel blocks the light beam emitted by the light-emitting diode in turn, the phototransistor emits a series of electrical pulse signals, which are shaped into a smooth pulse signal through the signal acquisition and measurement module, so that the sensor can output the corresponding frequency as the wheel rotates. The continuous pulse signal is then counted by the controller into the number of pulses per second, and the number of pulses per second is converted into a km/h value.