Texas Instruments: Upgrade active safety to standard configuration
In the current automotive electronic active safety market, some international brand car manufacturers in Europe and the United States are mainly guiding the market demand and formulating relevant industry standards, especially in some countries in Europe and North America. Regulations or mandatory requirements, such as the previous IEC61508, as well as the current ISO-26262, are standards in the European and American markets. It is understood that in 2015, European car manufacturers may fully introduce automotive components that comply with the ISO26262 standard.
The ISO 26262 standard determines the safety requirement level from A to D (AutomoTIve Safety Integrity Level ASIL) for the system or a component of the system according to the degree of safety risk, of which D level is the highest level and requires the most stringent safety demand. Therefore, the future development trend of automotive active safety systems is to achieve ASIL-C / D level. In addition, through active safety systems such as radar and cameras, the driver will be assisted in making predictions about the need for early braking without predicting or unknown road conditions, thereby increasing the overall level of vehicle intelligence.
Jiang Hui, Business Development Manager, Automotive Electronics China, Texas Instruments Semiconductor Division
The main functions of many active safety application systems (such as ABS, ADAS, chassis control, body electronic stabilization system, pedestrian assisted collision avoidance system, etc.) are to carry out safety-related early warning and processing. A more obvious phenomenon on the market today is that as driving safety is increasingly valued by people, more and more car manufacturers have upgraded their active safety systems to a standard configuration for automobiles. In the Chinese market, domestic manufacturers are actively following up with international standards, but overall, no matter whether it is passive safety or active safety, there is no clear mandatory regulations or national regulations in China. In the selection of active safety products, the domestic market places more emphasis on the cost-effectiveness of products or solutions and is more sensitive to prices.
The requirements of automotive active safety systems for semiconductor devices include: first, to achieve a balance between product performance and price, that is, to achieve the best price-performance ratio; second, the development process must meet certain standards, such as compliance with ISO26262 specifications; in addition To be able to provide a complete set of solutions including analog devices, microcontrollers, software, system architecture, peripherals, etc. from the perspective of the system; at the same time, it is necessary to provide corresponding development tools to facilitate customers' system development.
In response to the above characteristics, TI launched "SafeTI", a complete set of functional safety-oriented design kits, including from the microprocessor TMS570 (can meet both IEC61508-SIL3 and ISO26262 ASIL-D) to the power supply TPS65381 (meet ISO26262 ASIL-D) and drive circuit solutions, it can greatly simplify the customer's system safety design.
TI has always been deeply rooted in the automotive safety market, with better optimization in terms of product performance and cost. First, in response to the ISO26262 automotive electronics safety standard, TI introduced the new Hercules TMS570 safety microcontroller (MCU), which is based on the ARM Cortex-R4 core and uses a single-chip dual-core architecture, which makes the system design more streamlined. The MCU is a redundant security system that only requires a TMS570 chip and power supply, which also saves space on the PCB board; at the same time, the ARM Cortex-R4 core focuses on real-time processing (Real time) features can be guaranteed Excellent real-time response under large data processing conditions. TMS570's high-end products also have floating-point arithmetic capabilities, which can further satisfy applications that require high security and real-time processing.
On the other hand, with the dual-core lockstep function, security-related protection and diagnostic functions are implemented by hardware, which can help customers save a lot of software overhead and development costs, and reduce the difficulty of software development. At the same time, TI can also provide a series of development documents, such as safety manuals, safety analysis reports, and safety case reports to facilitate the development of functional safety systems for customers and greatly shorten the product development cycle. And can use the parameters provided in the TI documentation to shorten the time for the product to obtain third-party certification, so that the customer's terminal products can face the market faster.
In addition, the TMS570 series products have a full coverage product line from low-end to high-end, providing customers with more diversified choices, which can be widely used in advanced driving assistance systems, electric power steering, hybrid vehicles and electric vehicles, ABS / ESC, Airbag, electronic assisted parking and other applications. TMS570 components meet industry safety standards (can meet both IEC61508-SIL3 and ISO26262 ASIL-D), making it easier for customers' system designs to pass ISO26262 or IEC61508 certification.
In terms of analog devices, TI ’s first power management chip for functional safety, TPS65381, can be used with TMS570. It can monitor the working status of this MCU at any time. It has an independent watchdog and embedded self-test, which can be implemented with TMS570. To meet the requirements of ISO26262 ASIL-D.
The future development of automotive active safety mainly includes the following aspects: First, integration will become a major trend, ABS will gradually transition to ESC, and integrate with EPB; Second, in the EPS part, mostly hydraulic or mechanical power steering in the past, In the future, it will be transformed into electric power steering. Third, the addition of radar, video, and digital signal processing technologies will bring more powerful pre-processing and pre-alarm functions. The active safety technology of electric / hybrid vehicles is also an important focus in the future. Because of the different sources of control signals and processing strategies, the active safety design of motor processing and brake processing of such vehicles will be Traditional cars are slightly different. The latest products of TI's TMS570 have rich peripherals and interfaces for controlling the motor (ePWM, eQEP, eCAP), which can control the motor more conveniently while ensuring safety.
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