How to design the HVAC mode dial of automobile air conditioner?

The first thing to determine is the position of each mode damper in different modes. On this basis, the motion angle of the connecting rod is determined, and then the length and direction of the chute of the integrated control panel are designed according to this motion angle. At present, it is impossible to design in China, but it can only be simple. Like the picture in your question, it is obviously the style of Denso.