Support for key technical briefs in future in-vehicle safety systems

In the issue of ensuring the safety of drivers and passers-by, the proportion of electronics technology has increased. According to the survey, 80% to 90% of traffic accidents are caused by driver's cognition and misjudgment. The use of sensors, on-board cameras and navigation systems to obtain road information to the driver, reduce driver's judgment errors, avoid traffic accidents, and thus reduce the occurrence of casualties, which is the theme and goal of the vehicle safety system in the future. LSIs for FlexRay, image processing LSIs for in-vehicle cameras, and linkage devices for navigation systems are key components of future in-vehicle safety systems. In the future, Renesas will provide the necessary electronic equipment to the vehicle safety system.

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From "impact safety (passive safety)" to "safety prevention (active safety)"

What has always been valued is the safety of impact. The goal is to minimize the level of damage in the event of an accident. Representative examples are: airbags, head protection cushions, seat belt pre-stretching, body impact absorption properties, etc.

The future development trend is "safety prevention", that is, "preventing problems before they happen." At this stage, ABS (Anti-lock Braking System), VDC (Vehicle Dynamic Stability Control System), etc. have already been put into use. In the continuous development of vehicle safety systems, the impact warning system, the impact mitigation braking system, the LDWS (lane departure warning system), and the road information warning system from the navigation system will be put into use one after another.

FlexRay network

Among the main technologies of the in-vehicle safety system in the future, the in-vehicle network FlexRay has been widely concerned. Compared to today's mainstream CAN, FlexRay is characterized by its high speed and high reliability. FlexRay plays a vital role in future in-vehicle electronic control systems that control the steering wheel, brakes, and body stability. Renesas has joined FlexRay's standardization research community to drive LSI (Flexu bus driver with built-in FlexRay controller) for FlexRay to production as soon as possible (Figure 1). The development of SiP (System in Package) for packaging MCU and bus driver will be launched soon.

Image processing technology for car cameras

Another important technology for future vehicle safety systems is the image processing technology of on-board cameras.

Today's cars are equipped with a variety of sensing technologies, such as weather sensing and driving distance sensing. The car camera with image processing technology can combine all of the above functions.

In the future, the vehicle safety system will also be equipped with technical devices such as lanes and vehicle identification cameras, infrared cameras, rear camera cameras, and instant inspection cameras. To improve safety, a car will carry more than 10 cameras. Automakers are now developing doze detection and alarm devices for in-vehicle surveillance cameras, as well as techniques for driving off lane warnings when there are surveillance cameras in front (Figure 2).

Here, image processing technology is very important: the image signal sent by the camera is processed to take out the necessary signals. By analyzing the edge portion of the image, it is possible to detect the vehicle and the lane ahead. Through road detection, it is also possible to alert the lane departure behavior. Renesas is providing image processing technology combining image processing LSI and 32-bit microprocessor SH-4A.

Linkage with car navigation system

Informing the driver of the poor road conditions and reminding them of their attention is also an important part of “safety prevention”. The high-performance car navigation system can inform the driver of road construction and other information through the stored map information, and can record the large drop, road fluctuation, sharp turn and other information recorded by the on-board electronic control system while driving on the road. On the GPS repository, the driver can be alerted next time you come to the location. If the road condition is rectified in the next road, the system will automatically correct the information record. In the market for microcontrollers for car navigation systems, Renesas accounts for 60% of the world's share and 80% of Japan's share. In response to the demand for car navigation system technology from different auto manufacturers, Renesas is developing an LSI for car navigation centered on the high-performance 32-bit microcontroller SH-4A.

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