A brief analysis of the role of in-vehicle network bandwidth is the key

Just like today's smartphones, cars are no longer a simple means of transportation. The use of new technologies has made driving safer, and the continuous enrichment of in-car entertainment systems has also improved the quality of using the car. With the increase of in-vehicle electronic equipment, traditional simple circuits can no longer meet the demand for data transmission speed. Therefore, the expansion of in-vehicle networks has been carried out. Among them, bandwidth is a link of vigorous development. It can be said that there is not enough bandwidth for Support, any idea is empty talk. Why is greater bandwidth needed?
Bandwidth is no stranger to us. It is the same as home networks. It is used to measure the ability of data transmission speed. The same is true in cars. A high-speed vehicle network environment is like a bridge between various sensors and processors. Like a multi-lane bridge, combined with the performance of the processor, ensures that relevant functions can react accurately and quickly.
In this regard, some active safety technologies that have not yet been widely popularized are particularly prominent. Many active safety systems with active braking functions use the images provided by the camera behind the central rearview mirror to identify the vehicle in front of the car. For road conditions, unlike traditional radar probes, the data transmission of screen information is much larger. If the transmission speed cannot be ensured, the control computer of the active safety system will not be able to issue braking instructions as early as possible when a collision risk is detected.
We previously expected that the autonomous driving technology that will be promoted by 2020 will be more dependent on bandwidth. A large amount of information from the actual road is captured by various sensors distributed around the car body and transmitted to the processor. Calculation is performed, and the instructions are then transmitted to the actuator for action, which requires greater bandwidth as a guarantee.
What does the current high-speed data transmission rely on?
The transmission speed of information is also reflected in the in-vehicle entertainment system. At present, most high-end cars rely on the system to form a set of in-vehicle entertainment system architecture. In the system, the transmission of information and data relies on optical fibers, using optical fiber lines. To replace the traditional automobile wiring harness, it can provide a collective bandwidth of about B. In terms of transmission speed, it basically guarantees the needs of the existing car entertainment system. In this architecture, equipment such as navigation audio and car phones are assembled, and the Audi we are familiar with Just do it this way. However, with the development of in-vehicle interconnection systems, systems that use optical fiber lines to transmit information may be difficult to support the increasingly large in-vehicle interconnection systems in terms of hardware structure and data transmission speed. Not only that, the system does not have the ability to solve the problem of vehicle network integration.
As a giant in the industry, companies such as Broadcom B, Samsung Mobile Phones, Gehua Cable, Bosch Continental, etc. have close cooperative relations with this company. The company has launched new data transmission technology and applied it in BMW models. The new technology is The data transmission speed has been greatly improved compared to traditional technology. Not only that, the wiring harness used is also smaller. Originally, to achieve b bandwidth, it generally required wiring harness support. The data transmission technology introduced by Broadcom only requires wiring harness support. That is to say, the bandwidth that supports b will be launched in 2018. The technology that can transmit b on the line will be launched in 2018. Another benefit of it is that the total data transmission speed will not be significantly reduced due to the addition of equipment.
In addition, new technologies are structurally more reasonable than systems. Why do you say that? Based on the structural characteristics of the bus, if any component in the bus structure fails during the actual use of the car, it will cause the entire entertainment system to be paralyzed. For example, some high-end cars are equipped with a car phone, and the car phone is built into the structure. When this component fails, the entire bus will be disconnected, which will affect the use of radio navigation and other entertainment equipment. Only Only after the faulty components are repaired can the entire system be used normally. This characteristic of affecting the entire system in a single step virtually increases the probability of failure of the entire system. The data transmission technology introduced by Broadcom can avoid similar situations from its structure.
Taken together, although systems using optical fiber as the transmission medium have certain advantages in terms of bandwidth and anti-interference capabilities, their expansion capabilities have entered a bottleneck stage that is difficult to break through. In contrast, the Ethernet-based technology launched by Broadcom not only has higher transmission speeds and a more reasonable structure, they will also use the characteristics of this architecture to promote the integration process of in-vehicle networks, whether it is Wired networks such as B-bus or Bluetooth or wireless networks can be integrated in the same network environment, simplifying the structure while helping to increase data transmission speed.
We have always been concerned about the smooth control experience of the central display screen with touch function, but the effect in this regard does not seem to satisfy us, and it is incomparable to Apple products. In fact, the capability of the processor determines the smoothness of the picture to a certain extent. In addition, a capacitive screen that can support multi-touch function requires the screen to recognize fingers more directly. However, unlike ordinary electronic products, it is difficult to install it in a car. The original central control display needs to meet the requirements of safety regulations. Therefore, the thickness of the screen will affect the recognition of finger movements, thereby slowing down the entire touch rhythm. From this point of view, compared with the processor, there is no direct relationship between the touch smoothness of the vehicle central display and bandwidth.
Summary
The advancement of automotive technology not only requires a forward-looking concept, but more importantly, how to turn it into reality. The bandwidth issues mentioned in this article may strangle the throat of innovation, and Ethernet The introduction of the Internet is very likely to make a qualitative breakthrough in the bandwidth of the vehicle network. At least in the process of investing in new technologies, engineers will not be afraid of technical applications due to the problem of data transmission speed. Of course, whether it is New technologies, or the development of technologies to achieve greater bandwidth, are all complementary to each other. The success of new technologies must be based on market orientation. At the same time, as the support behind it, the demand for bandwidth will automatically transform. For research and development goals
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