Whether it is the programming of electronic programs or the manufacturing process of semiconductors, it has almost developed rapidly in recent years. Cars are also quietly revolutionary in this era. Sometimes we are in it, but we don’t know. From the earliest purely mechanical structure (diesel era) to the electronic system assembly with simple electronic technology (analog signal) and now with bus and multi-interruption processing.
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It is also because of the maturity of semiconductor technology and the accumulation of blood and sweat of countless electronic engineers. The electronic signals in the digital circuit era can be quickly and stably transmitted from each other. In fact, Xiaobian is very compatible with the engineers who design the electronic communication protocol. It is also in their discussion of logic and system efficiency again and again that they have the CAN 2.0B bus specification widely used today.
So what kind of electronic technology does CAN bring to us? What kind of driving life has it brought to us, and what kind of changes have we brought to us by car?
Control configuration:
The earliest control assist system was ABS, anti-lock braking system. But then joined the ESP body stability control, these two systems are relatively long in the car.
However, with the use of the CAN bus, a large number of other electronic systems have been introduced into brake force distribution (EBD), brake assist (EBA), and automatic parking.
Comments: These electronic systems seem useless. In fact, they all protect the driver silently. When a single wheel, especially the front wheel, enters the waterhole or the uneven ground, the rapid deceleration of a wheel will cause the vehicle. Rotation, this time, ESP and EBD will intervene to ensure that the vehicle will not slip and drift.
Multi-function dashboard:
Now the multi-function dashboard can not only display the current driving style, the status of each system, the current songs played by the all-in-one, the current driving mileage, and the mileage that can be used for cruising.
Comments: From now on we have to observe one by one to confirm that the system can directly prompt you. In the past, we were observing the oil meter and seeing how far it can be opened. Now it is the driving computer that directly combines your current driving style and fuel consumption to measure the mileage that can be used for cruising. This is a big change in the life of our car.
Fixed speed cruise:
In fact, don't underestimate this function. This function actually needs a lot of data to assist a function that can be completed. He needs engine speed, gearbox control, throttle control, current speed, driver brake signal, ECU auxiliary parameters, etc. A lot of parameters to assist with the completed function.
Comments: When driving at high speed and long distance, if the vehicle density of the road is allowed, this function can liberate the driver's foot, allowing the driver to enter a very comfortable state and directly adjust the speed by using the steering wheel. Very convenient.
Keyless portable:
The keyless portable function allows the owner to press a button when the key is approaching the car. When the owner pulls the door handle, the car will unlock the door immediately, and the door will be unlocked. It can be opened right away. And when carrying the key to enter, you only need to press the Engine STAR on the car to ignite the engine. When you leave the car, the car will automatically lock the door (the individual models will not).
Comments: This function is very suitable for people who are busy with life, at least the process of locking the car and opening the door, eliminating the trouble of the owner, will not let you suddenly think of the car does not know that the lock is not. But there is also a drawback, because driving without the need to insert a key, it is easy to forget where the car key is.
Car information service system (example: OnStar)
OnStar evaluation
Services provided by OnStar:
1. Collision automatic help 2. Airbag popping open automatic help 3. Emergency rescue assistance 4. Love assistance passers-by 5. Door remote emergency opening 6. Car stop position prompt 7. Roadside rescue assistance 8. Stolen vehicle positioning 9. Full course Sound control pilot 10. Destination setting assistance 11. Point of interest navigation 12. Vehicle condition monitoring report 13. Real-time on-demand monitoring 14. Full-tone hands-free phone.
OnStar provides emergency call after vehicle collision, vehicle diagnosis. These functions are based on the powerful CAN bus function. Don't underestimate the vehicle diagnosis. This diagnosis process requires almost every vehicle and every sensor to confirm. In the normal driving of the vehicle, only CAN bus can do it.
Comments: OnStar has brought a lot of changes to our driving life. You don't have to manually find the destination status. The car is like an elf to help you with these things, including calling phones, emergency rescue and so on. The most important thing is In the long-distance driving alone, the car owner is given a safe guarantee. At least after a car accident in a sparsely populated area, someone can help you call the ambulance and the police. If you have a bad car in the mountain, someone can help you with emergency rescue. .
Driving assistance function:
Comments: These auxiliary systems can be said to be a great help for car owners in big cities, but also a powerful aid for novices.
to sum up:
There is no doubt that the development of automobiles has been from the beginning of pure mechanical to analog circuits, and now has a highly integrated bus technology, from the beginning of the mechanical way to the point of sale to the current powerful electronic auxiliary system as a selling point. This is a technological revolution, and it is also a brand new era. In the future, the electronic technology applied in automobiles will only be more and more, but in many functions, it is also a function that is suitable for its own functions. Therefore, the owners still have to Choose according to your own needs, not because of the momentary novelty spent unnecessary money.
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I think everyone will want to make a rough solution to the CAN bus after reading it. What is a bus, that is, all data needs to go through this line, called the bus. Of course, in order to avoid data conflicts and errors, there are many electrical rules in the bus protocol.
In the past, the digital age has already arrived very early, but the electronic systems integrated in the car are not directly proportional to the development of the digital age, because the more systems, the more complicated and complex the communication. A device needs to communicate with multiple devices at the same time, which is obviously impossible at that time, so the high-load, inefficient communication method determines the number and function of the electronic system.
Therefore, CAN (Controller–area network) has the advantage of bus. It makes any system or sensor become a node. The communication between nodes and nodes is global. Any node sends a message, and any other node can receive. Moreover, it has an efficient arbitration mechanism. When two nodes transmit messages at the same time, the low priority will automatically exit, and the high priority will continue to be sent. This high-efficiency, high-speed transmission method determines that there are a large number of electronic systems and sensors in the car.
The CAN bus is unquestionable for digital communication, but it uses the line and communication method. That is, the logic of the two lines CAH_H and CAN_L of the CAN bus is the same when the voltage is the same, and the logic is 0.
Because of this communication method, when communicating, the node is changing the transmission signal and detecting the bus. When the node with a relatively high device ID (that is, the priority is relatively low) is transmitted, when it transmits the highest bit of the device ID.
Suppose there are nodes A and B now.
A (ID)
B (ID)
If A and B nodes start transmitting signals at the same time, they first transmit the highest bit of their own device ID, which is 0. Then the next bit, the first three bits of the transmission of nodes A and B are the same, so the data is 001. But in the fourth place, node A is 1 and node B is 0. At this time, the ID of the node B is lower than that of the node A, that is, the priority of the node B is relatively high. Therefore, when the node A detects that it is different from the detected one, the node A will exit the transmission. But Node B continues to send.
Because of this transmission mechanism, the CAN bus can meet the simultaneous communication and transmission of a large number of automotive systems and sensors. Therefore, the automobile can develop the automotive electronic technology of various types and functions to date.
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