Audi LED headlight disassembly and controller module changes-EEWORLD

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Several friends mentioned the evolution of headlight control under a centralized architecture, which mainly involves the control evolution of interior lights and front headlight control system AFLS. In other words, under the centralized architecture of the future, will the control of headlights, which was originally automatic control (interaction with ADAS system) or external headlights, be upgraded to the body domain controller (similar to ICAS1 made by Continental) to make more complex modules, and integrate some driving content with other components? Who knows the future? With the internal circulation, if we want to further differentiate quickly, it is logically feasible to take back the control algorithm of the headlights for differentiation.

Figure 1 uAFS system

01 Mercedes-Benz LED lights

I found two different types of LED lights, as shown below. Since there are many pictures, I will focus on the pictures. But from the perspective of car lights, LED headlights mainly include LED modules , and the upper The LED controller mainly includes multi-channel LED drive control and several stepper motor controls whose main function is level adjustment, and several high-side switches for cleaning and heat dissipation.

1) LED lights

This headlight was made by AL for Mercedes-Benz. This design uses active fan cooling (13.5V 0.3A specification) and makes the radiator relatively small.

From the perspective of car lights alone, the main difficulty lies in LED heat dissipation and road optical issues, which are not within the scope of electronics. All electronic designs are mainly based on matching the aluminum substrate and LED to control the temperature of the LED to ensure the life of the lamp.

2) LED headlights2

The second lamp is made by Hella, which uses passive cooling and uses a largeHeat sink design .

02 Lighting control in the domain controller

Let's start with the design of Audi E-tron. It is still very traditional. Starting from the J519 controller, it is controlled by many modules.

The definition function of ICAS1 actually includes several parts:

FCM: Dynamic exterior lights

Online personalization: lights, exterior lighting

Charging: mainly displays the interaction during charging

These parts are moved from the previous lighting controller to the domain controller. In the long run, when MQB switches to MEB, the lighting controller will be further simplified, at least the software part will be moved to the domain controller. Therefore, it is still possible to put ASIC into the lights and combine the original modules into the body domain controller. The main thing about the body domain controller is the process of reorganizing all external devices, which takes a long time.

Summary: I think the process of transitioning from a distributed architecture to a centralized architecture is quite fast, and it will be faster on the electric vehicle platform. However, the core issue is whether the EEA of the electric vehicle-specific platform needs to be implemented in one step, similar to the plan we said a few days ago that we expect to gradually implement after 2025. This requires the reorganization of all suppliers and large-scale verification. It is hard to imagine how many parts need to be redeveloped.

Reference address：Audi LED headlight disassembly and controller module changes

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