Design of Speed Regulation Module for Automobile Air-Conditioning Blower

Due to the short-lived electric sparks of the brushed DC motors used in traditional automobile air-conditioning blowers, brushless DC blowers have been widely used in recent years, and commutation control algorithms are used in most speed control modules. However, the commutation control algorithm makes the motor torque fluctuate and the speed is unstable during operation, which eventually leads to unstable air volume. This article uses MC9S12XDP100 to design the speed control module of the DC brushless blower to improve its speed control performance. The speed control module uses the vector control double closed loop algorithm, and uses the expert system fuzzy PID in the outer speed loop for parameter tuning. The speed, air volume, and current tests prove that the speed control module solves the problem of unstable speed and air volume caused by torque fluctuation of the commutation control algorithm, and improves the speed control effect.