Automotive Can Interview Questions

CANopen is a high-level communication protocol and also a device profile specification that is based on the CAN (Controller Area Network)protocol. This protocol was developed for embedded networking applications, such as in-vehicle networks. It also covers a network programming framework, device descriptions, interface definitions, and application profiles. CANopen provides a protocol that standardizes communication between devices and applications from different manufacturers.

The main components of a standard CAN system are the controller, the transceiver, and the bus. The controller is responsible for generating the CAN signals and for managing the data that is transmitted on the bus. The transceiver is responsible for converting the CAN signals into electrical signals that can be transmitted on the bus. The bus is responsible for connecting the controller and the transceiver and for carrying the CAN signals between them.

Arbitration is the process that the CAN controller uses to determine which node on the network gets to transmit data at any given time. When two nodes try to transmit data at the same time, the CAN controller uses a process of arbitration to decide which node gets to go first.

The main difference between private and public CAN networks is that private networks are used for closed systems where all of the nodes are known and trusted, while public networks are used for open systems where any node can join or leave the network at any time. Private networks are typically used in industrial or automotive applications, while public networks are used in public transportation or other applications where it is important to be able to add or remove nodes from the network without disrupting the entire system.

Controller Area Network (CAN) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles, but is also used in many other contexts. When interviewing for a position that will require you to work with CAN, it is important to be prepared to answer questions about the protocol. This article discusses some of the most common questions you may be asked about CAN during your interview.

Yes, it is possible to implement error detection on a CAN network. There are a few different ways to do this, but one common method is to use a checksum. This checksum is calculated by the sender and included with the data that is sent. The receiver can then recalculate the checksum and compare it to the one that was sent. If they match, then the data is assumed to be correct.

There are four types of frames exist-Data Frame to carry Data, a Remote Frame for requesting data from another node, an Error Frame for acknowledging transmission/reception errors, and a last one is overload frame used for wait time requests if the node is busy. Go through from this article for detail.

As you have seen in the CAN frame format in the above question only the Arbitration field in the extended frame format only differs from the standard CAN means extended CAN architecture is designed in such a way that standard and extended CAN coexist on the same network. In extended frame format, the IDE bit distinguishes between the standard and extended CAN.

CSMA/CD is Carrier Sense Multiple Access/Collision Detection. It is applicable when the data transmission starts. A Node with CSMA/CD-enabled feature detects the collision and stops further data transmission. It will initiate data re-transmission. In CAN this feature is successfully implemented through Bit Monitoring feature of the Transmitter node. Click for detail on the bit monitoring Concept.

CAN Stands for Controller Area Network patented by Robert Bosch in 1986 to replace conventional wiring used between ECUs for data sharing between ECUs in vehicles.

Apart from these, the CAN protocol has other powerful features. It offers the in-built features in the CAN controller like synchronization of nodes, Frame Integrity check through CRC mechanism etc. because of all these features offered at the h/w level, lots of software coding overhead is reduced. for detail about the features list please go through this article

Part – 10 | CAN Protocol|Automotive Interview QA|Transmission of Same ID in CAN | Embedded World

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