Just like today's smartphones, cars are no longer a simple means of transportation. The use of new technologies makes driving safer, and the continuous enrichment of in-car entertainment systems has improved the quality of cars. With the increase of in-vehicle electronic devices, traditional simple circuits have been unable to meet the data transmission speed requirements. Therefore, the expansion of the in-vehicle network has been carried out. Among them, bandwidth is a part of vigorous development. It can be said that there is not enough bandwidth for Support, any idea is empty talk.
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Why do you need more bandwidth?
Bandwidth is no stranger to us. Like the home network, it is used to measure the speed of data transmission. This is also true in cars. A high-speed in-vehicle network environment is like setting up a multi-lane between sensors and processors. Like the bridge, it combines with the performance of the processor to ensure that the relevant functions react accurately and quickly.
In this regard, some active safety technologies that have not been widely used are particularly prominent. Many active safety systems with active braking function recognize the road conditions in front of the car through the screen provided by the camera behind the center rearview mirror. The radar probes are different, and the data transmission of the screen information is even larger. If the transmission speed cannot be ensured, the control computer of the active safety system cannot issue the braking command as soon as possible when the collision risk is found.
Previously, we predicted that the autopilot technology, which was promoted by 2020, would be more dependent on bandwidth. A large amount of information from actual roads was captured by various sensors distributed around the body and transmitted to the processor for calculation. The instructions are then transmitted to the actuator for action, where greater bandwidth is required as a guarantee.
What is the current high-speed transmission of data?
The transmission speed of information is also reflected in the car entertainment system. At present, most high-end cars rely on the MOST system to build a car entertainment system architecture. In the MOST system, the transmission of information data depends on optical fiber, and the fiber optic cable is used to replace it. The traditional automotive wiring harness, which can provide an aggregate bandwidth of about 25 Mbps, basically guarantees the demand of the existing in-vehicle entertainment system in the transmission speed. In this architecture, equipment such as navigation, audio and car phone is assembled, and the familiar Audi MMI is familiar. This is the way. However, with the development of in-vehicle interconnection systems, MOST systems that use optical fiber lines to transmit information may be difficult to support an increasingly large-scale in-vehicle interconnection system in terms of hardware structure and data transmission speed. Not only that, but in terms of the integration of the vehicle network, the MOST system does not have the ability to solve.
As a giant in the industry, Broadcom (with Samsung Mobile, Gehua Cable, Bosch, mainland and other companies have a close relationship with this company) the company launched a new data transmission technology and applied in the 2014 BMW X5 models The new technology has greatly improved the data transmission speed compared with the traditional technology. Moreover, the wire harness used is also smaller in size. The original bandwidth of 100 Mbps generally requires 3 pairs of wire harness support, and the data transmission introduced by Broadcom. The technology can support 100Mbps bandwidth with only one pair of wire harnesses (a pair of wires can transmit 1Gbps technology in 2016), and another advantage is that the total data transmission speed will not be greatly attenuated due to the addition of devices.
In addition, the new technology is also more reasonable in structure than the MOST system. Why do you say this? Based on the structural characteristics of the MOST bus, if any component belonging to the MOST bus structure fails during the actual use of the car, it will lead to the paralysis of the entire entertainment system. For example, some high-end cars will be equipped with car phones, and car phones are built in the MOST structure. When this component fails, the entire MOST bus will be disconnected, which will affect the radio, navigation and other entertainment devices. Use, only after repairing the faulty part, the whole system can be used normally, and the characteristics of this whole body invisibly increase the probability of failure of the whole system. The data transmission technology introduced by Broadcom can structurally avoid similar situations.
On the whole, the MOST system with optical fiber as the transmission medium has certain advantages in terms of bandwidth and anti-interference ability, but its expansion capability has entered a bottleneck stage that is difficult to break through. In contrast, Broadcom's "Ethernet"-based technology will not only have higher transmission speeds and more reasonable structure, but they will also use the characteristics of the architecture to promote the integration of the vehicle network. Processes, whether wired networks (such as CANBus buses) or wireless networks based on Bluetooth or Wi-Fi, can be integrated into the same network environment, simplifying the structure and helping to increase the speed of data transmission.
Is the touch experience of the central display related to bandwidth?
We have been paying more attention to the experience of controlling the fluency of the central display with touch function, but the effect in this regard does not seem to make us satisfied, compared with Apple products, it is unmatched. In fact, the ability of the processor determines the fluency of the picture to a certain extent. In addition, the capacitive screen capable of supporting multi-touch function requires the screen to recognize the finger more directly, but unlike ordinary electronic products, it is installed in the 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, thus slowing down the rhythm of the entire touch. In this way, there is no direct relationship between the smoothness of the touch and the bandwidth of the car's central display compared to the processor.
Editor's summary:
The advancement of automotive technology requires not only a forward-looking concept, but more importantly, how to make it a reality. The bandwidth problem mentioned in this article may hold the throat of innovation, and the introduction of "Ethernet" is very likely. The quality of the in-vehicle network has a qualitative breakthrough. At least in the process of investing in new technologies, engineers will not be afraid of technical application due to the problem of data transmission speed. Of course, whether it is new technology or development, it will be more Large-bandwidth technologies are complementary. The success of new technologies must be based on a market-oriented foundation. At the same time, as a backing support, the demand for bandwidth is automatically translated into research and development goals.
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