The role of the lights in ensuring driving safety is obvious, and in practical applications, the traditional headlamp system has many problems. For example, existing low beam lights have poor illumination at close range; there are also problems with the dark areas of illumination that exist when the vehicle turns and the glare of the area when the vehicle is driving on rainy days. The existing headlamp system cannot Very good solution or improvement. The changes brought about by the Adaptive FrontLighting System (AFS) system can help drivers easily face these problems.
The so-called AFS refers to a headlamp system that can automatically change two or more types of light to adapt to changes in the driving conditions of the vehicle. According to Steven Nelson, Director of Global Automotive Marketing at Freescale, “At present, there are many types of AFS on the market, ranging from relatively inexpensive horizontal systems to so-called “bending†applications. The horizontal system adjusts the vertical aiming of lights based on the load of the vehicle. This type of system is regulated in Europe. More advanced "bending" applications can dynamically change the light aiming or beam mode based on vehicle load, acceleration/deceleration, steering wheel angle, weather conditions, etc. These systems are generally step by step. Into the motor control. For example, if the light of the traditional headlights is consistent with the direction of travel of the vehicle when the curve is being exercised, there is inevitably a dark area of ​​illumination. Once there are obstacles on the curve, it is very easy to cause traffic accidents. At this time, AFS will produce a rotating light type, which will give enough illumination to the curve.
Mr. Shinichi Satoshi, General Manager of Automotive Electronics Market Center of Renesas Electronics (Shanghai) Co., Ltd. said: “There are two types of controls that can change the direction of the headlights. One type needs to turn the headlights before the short focal length, and the other is not before the rotation. Instead of turning on the mirror, in any case, the motor and gearbox need to be added. The input signals that determine the angle of rotation are the steering angle, the vehicle speed signal, the direction light, and the reverse switch." The calculation of the headlight angle and the control of the motor are performed by the MCU, the sensor and the motor driver. Existing automotive electronic systems have been able to collect information such as steering angle signals, vehicle speeds, and other devices such as directional lights and reverse switches, while the control of the motor is no different from other motors. Yosuke Shinji also said: "The design challenge of AFS is mainly to define the specifications, and then decide how AFS works and the design of MCU software. In AFS, Renesas MCU has been used in many Japanese cars for five years. Renesas can provide 16-bit MCU/M16C series and R8C series to meet the different needs of customers."
For the next development trend of AFS, Shinichi Shinji believes that in the future AFS, some car manufacturers are considering integrating image recognition functions to detect pedestrians, vehicles and roadside obstacles. In this application, a 32-bit processor with image recognition is required. Renesas' SH7774 for Adaptive Cruise Control (ACC) and Lane Departure Warning System (LDWS) is also suitable for future AFS. LED turn signals have also been introduced in newer systems, where a range of steerable LEDs provide horizontal, curved and other functions, eliminating the need for motor support.
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