Study on an Innovative Hardware-based Controller for Driving an Automotive Exterior Rear-View Mirror Mechanism

Chieh-Tsung Chi

The purpose of this paper is to design and develop a new controller based on a hardware circuit component that performs the task of driving and protecting the outside mirror base of an automobile to extend or fold inwards under safe conditions. By capturing the presence of the + 12V DC power supply and the polarity of the supply voltage, the system controller learns the intention of the automotive driver and immediately performs a rotation direction control of the driving DC motor (commonly known as the electric motor) inside the vehicle outside mirror base. During the controlling process, the system controller will dynamically detect the current flowing through the rear mirror body driving motor and performs over-current protection to effectively protect the driving motor and the controller circuit from over-current damage. In order to simplify the system controller circuit and reduce manufacturing costs as possible as, system DC motor controller circuit is designed by entirely using hardware circuit. This article is based on the general automotive rear-view mirror base motor drive and over-current protection requirements and then design based on a hardware circuit controller. The design ideas and the working principle of the all controller circuits are also introduced gradually in this article. In order to verify the working performance index of the vehicle exterior mirror body driving motor controller mentioned in this paper, a set of laboratory-scale driving motor controller prototype of the rearview mirror body will be set up in the laboratory. Under different experimental conditions, the completed system prototype experimental measurement and data collection will be carried out. Finally, through the collection of experimental data show that the design of the controller circuit functions and performance indicators can indeed meet the expected design goals of this paper.