Tonada has gathered many excellent domestic automobile air conditioner R&D members. In order to develop new products and solve the problems of applicability in domestic markets, overseas advanced design and manufacturing technology has been introduced into our company. Tonada has gained 9 China national patents on brushless fans. Thus, we have become one of the leaders in bus air conditioner industry in China. Tonada insists on using the best electrical and mechanical components to guarantee the product performance. We have analyzed the bus air conditioner system and components by applying computer simulation technology theoretically.