The core technology of new energy vehicle design

As new energy vehicle technologies mature, motor control systems are increasingly demanding: complex algorithms and advanced modeling for sensorless vector control require superior processing power; performance, efficiency, ease of use, and cost The comprehensive advantages of the aspect. The MB91580 series has a built-in CPU core and peripheral functions that can be used for motor control of electric and hybrid vehicles. It is worth mentioning that the resolver sensor has a built-in dedicated interface circuit to reduce system cost and achieve the necessary high rotation of the drive motor. The moment response control process achieves the goal of improving motor operation and reducing energy consumption.

High-efficiency, low-cost control of high-torque automotive motors is challenging. The MB91580 series achieves the goal of reducing system cost and high-speed feedback control by integrating key peripheral functions to improve motor operation and low energy consumption. The main features of the MB91580 integration include: 12-bit A/D converter and R/D converter with high-precision detection current and motor position, R/D converter for detecting electrical angle, and A/D for detecting three-phase current. Converter synchronization; integrated dedicated calculation circuit, so the sine and cosine values ​​of the electrical angle detected by the built-in R/D converter can be automatically calculated. "In addition to the performance characteristics of the solution itself, motor control related algorithms are also critical. Fujitsu can provide a variety of core key algorithms including mature 180-degree inverter control, so it has special technology in the field of motor control of new energy vehicles. Advantage." Wang Hao pointed out.

High-performance motor control systems typically include core servo functions, motion descriptions, and host communication functions, which place high demands on the processor's processing power. The MB91580 series has a built-in high-performance CPU core. The dedicated floating-point arithmetic unit integrated in the 160DMIPS high-performance CPU utilizes information processing vector conversion and PID control operations generated by built-in peripheral functions. This feature can improve motor operation by implementing further fast feedback control. And reduce energy consumption.

As a core component of new energy vehicles. Motor control is not only related to vehicle performance but also to driving safety. In Fujitsu's motor control MCU design, the safety features are fully considered, and the safety of the system is ensured through six safety mechanisms, including: self-diagnosis of the MCU, self-diagnosis of the bus, self-diagnosis of the RAM before the system is started; Illegal output port protection during runtime; bus diagnostics, RAM error correction, and flash error correction during system operation. According to reports, Fujitsu will increase the redundant design of core MCUs (such as dual-core or multi-core) in the future product plan to achieve stronger system protection.

Figure 2: Motor Control MCU combines six security features.

Video technology enhances user experience and security features

Well-known research institute iSuppli pointed out that first-line suppliers must meet three key conditions when developing systems for automobiles, one of which must support video display and feedback. In fact, the most attractive and fastest-growing part of the automotive electronics field in recent years is the in-vehicle infotainment system based on display terminals and the virtual instrumentation system. These electronic systems require high-performance video image processing capabilities that require high-speed processing of large amounts of real-time imaging data. "Fujitsu attaches great importance to this business market. At present, Fujitsu holds the world's leading market share in this field." Wang Wei pointed out.

At this year's Automotive Electronics Summit, Fujitsu highlighted the 3D panoramic system based on leading video processing technology, which attracted great interest from the participating professionals. This panoramic video system based on the MB86R11 "Emerald-L" 2D/3D image SoC supports real-time panoramic video monitoring of the car's surrounding environment with four cameras. It is reported that MB86R11 adopts a unique video processing algorithm. After the images captured by the four cameras are captured by the chip and 3D graphics are presented to the driver, the panoramic image of the car is clearly displayed on the LCD to achieve immersive vision. The effect is to enable the driver to accurately judge the surrounding driving conditions under conditions such as parking, driving, and turning. Since the chip itself integrates high-performance graphics processing and central processing unit and memory controller, real-time four-way video information processing is realized by hardware, which avoids performance bottleneck when a large amount of real-time video information processing is performed by a general video processing chip.

Figure 3: Video and image display applications in a car.

Panoramic video surveillance is one of the applications of advanced video processing technology. The MB86R11 can also support image display of automotive digital instrument panels and navigation systems, as well as graphics-based virtual instrumentation technology that will be widely used in mid- to high-end automobiles. In addition to MB86R11, Fujitsu also introduced a graphical automotive instrument reference solution based on the MB91590 series main chip design last year, which supports GDC's powerful graphics function and reversing auxiliary image display. In the same period, it also introduced two MB91570 for the instrument panel with segment LCD display. Series products.

In fact, the panoramic video function based on MB86R11 not only can bring 360-degree visually impaired visual effects to car driving, but also powerful video processing capability to achieve more security functions. "This solution can be combined with intelligent video recognition technology to achieve active security functions including subgrade identification, boundary recognition, and various security label recognition," Wang said. In addition, the processing power of the video chip can also carry out more security application function expansion, such as anti-theft function based on fingerprint recognition, image reversing auxiliary function and driving recorder, and so on. It is reported that the car's panoramic vision application of the chip can provide a complete reference design and realize a variety of functions including active safety functions. Work closely to solve vendor technical confusion

The cost of conventional automotive electronics is 17%, the cost of hybrid electronics is about 40%, and the cost of electronic components of pure electric vehicles will increase to 60%. The impact of electronic circuits on vehicle function, performance and cost will be Decisive. “The electronic control technology of new energy vehicles is more complicated. OEMs must carry out complex functional logic development, algorithm research and model-based simulation testing. These are challenges for us, and we hope that the solution providers will give more technical support. "The person in charge of technology research and development from a well-known domestic automobile manufacturer at the venue frankly raised his own confusion.

In fact, in order to successfully apply semiconductor solutions to product design, semiconductor companies generally provide a variety of support tools. For example, for in-vehicle video function development, Fujitsu can provide engineers with a beginner's kit, sample programs, and graphical design tools that allow designers to visualize test screen designs and provide a graphics library. “Not only functional and logical design is critical, but also a lot of on-site testing by OEMs. This is also very important work. We provide our customers with a mature reference design and support for reference-based application development, but also based on the site. The rich experience of support provides guidance for the problems in customer testing, which is very important for manufacturers to accelerate product development and improve product performance.” Wang Wei pointed out that “especially in the core motor control of new energy vehicles, we have a very strong The local Chinese R&D team specializes in research and development of motor control and drive technology, and our extensive application development experience makes our product solutions more suitable for local Chinese customers."

How to reduce the cost of new energy vehicles has become a common topic of concern for the automotive industry, and it is critical to occupy semiconductor devices that cost more than 60% of pure electric vehicles. “We have launched and will soon launch a variety of programs with special attention to low-cost design. For example, our upcoming high-voltage MCU products will integrate high-voltage output and can directly output 40V, 60V or 80V high voltage, so that motor control including doors and windows, wipers, etc. The design of the scheme is more simple and low-cost," said Wang Wei. In addition to high-voltage MCUs, Fujitsu also reduces costs by implementing more functional integration in the product. For example, the sensor interface and control functions are integrated in the latest motor control MCU, and the analog circuit technology is integrated with the Flash MCU in the high-voltage MCU. Will integrate battery management features, and more.