What Is an ECU? ECU, or Electronic Control Unit, also known as the “onboard computer”, is essentially a microcontroller for automobiles. It is composed of a microprocessor, memory, input/output interfaces, analog-to-digital converters, and other large-scale integrated circuits, similar to a regular computer. In simple terms, the ECU is the “brain” of the car. It is … Read more
Fault Phenomenon A 2017 Mercedes-Benz V260L vehicle, equipped with a 2.0T engine, has a navigation system with version number NTG5.2 of the COMAND (Cockpit Management and Data) system, with a total mileage of approximately 35,000 km. The owner reports that the COMAND display is black, with no display or sound, and all the system’s switch … Read more
1 8-Bit/16-Bit Bus Timing Analysis 1.1 8-Bit Microcontroller Bus Timing There are many 8-bit microcontrollers with external buses, such as the 51 series and AVR series. This article takes the W77E58 as an example. The W77E58 is an enhanced 51 microcontroller introduced by Winbond, with a maximum operating clock of 40 MHz. At the same … Read more
Today, I bring you the design of a CAN bus controller based on FPGA. Due to the lengthy content, it is divided into three parts. Today, I present the third part, followed by the next one, which covers the program simulation and testing, as well as a summary. Without further ado, let’s get started. I … Read more
Source | Vehicle Terminal Function of the Termination Resistor The CAN bus termination resistor serves three purposes: 1. Enhance anti-interference capability, allowing high-frequency low-energy signals to dissipate quickly. 2. Ensure the bus quickly enters a dormant state, allowing the energy of parasitic capacitance to dissipate faster; 3. Improve signal quality, placed at both ends of … Read more
Editor ▎ Wang Yan Review ▎Yu Yongchu Jinfen Mall Popular Book Rankings ☞ Jinfen’s Favorite Book Rankings ☞ Mechanical Book Rankings ☞ Production Management Rankings ☞ Design Software Rankings How to Quickly Publish Articles in the ‘Automotive Engineer’ Magazine October 2022 Automotive Production and Sales: Continued Year-on-Year Growth, New Energy Vehicles Set New Historical Highs … Read more
In bus systems, both RS-485 and CAN-bus are commonly used buses, each with unique characteristics and application scenarios, widely applied. Today, let’s discuss their differences. 1. What is RS-485? RS-485 is a serial communication protocol that has been around since the mid-1980s, originally defined for industrial market applications. It uses differential signaling with negative logic, … Read more
When the CAN bus malfunctions or data transmission is abnormal, various strange fault phenomena often occur, such as abnormal dashboard displays, inability to start the vehicle, failure to turn off after starting, decreased vehicle performance, and loss of certain electronic control system functions. This is because relevant data or information is transmitted through the CAN … Read more
4. Short Circuit of CAN L to Ground When a short circuit occurs between CAN L and ground, due to the fault tolerance characteristics of the CAN bus, the entire CAN network may be unable to communicate or generate related fault codes. However, for certain vehicle models, such as Haima, the fault tolerance characteristics of … Read more
Before performing CAN bus communication, it is important to ensure proper bus configuration, such as termination resistors. They are crucial components that affect bus communication. Below, we will analyze the effects of not using termination resistors solely from the perspective of signal amplitude and time constant, without considering signal integrity. Termination Resistor Requirements According to … Read more