Electric Window Regulator Based on Intelligent Control

In order to effectively solve the problem of installation cost of automobile electric windows and the safety of passengers, the window regulator of the car must have an intelligent control function. For example, most automobile windows now have an anti-pinch function. In this paper, the model of DC brushed motor is analyzed, an intelligent control scheme for automotive power windows is proposed, and the relationship between current ripple and window travel, motor current and external resistance are verified. In the hardware design, S9S12G128 is the main control chip, and the motor current acquisition method is designed. In the software design, intelligent control methods such as current integration method, adaptive and self-learning algorithm and intelligent speed regulation method are proposed to realize functions such as automatic window opening and closing, intelligent anti-pinch and intelligent speed regulation. After many experiments, the results prove the feasibility of the above methods and the stability of the system.

AN APPROACH FOR SEMI-AUTOMATIC REDESIGN OF MECHATRONIC PRODUCTS BY MULTIDISCIPLINARY OPTIMISATION

Mechatronic products are widely spread today, but their development still is a challenge. In addition, with the trend of individualisation, not only one solution must be designed but multiple configurations are needed to fulfil customer-specific requirements. To reduce cost and development time, usually existing products are adapted for this purpose. Even though a lot of knowledge is already available through the previous product version, because of multiple disciplines that must be considered in mechatronic systems, even redesign processes are complex. To support the adaption of mechatronic products to changed requirements, an approach to systematically reuse the knowledge available from previous product versions is proposed in this contribution. Through multidisciplinary behaviour optimisation, the solution space is reduced to build an adapted product meeting the new requirements. The approach is explained in detail and illustrated with the example of an electric window regulator and the results are discussed thoroughly.

Wear analysis of an automotive window regulator slider

The slider, which is made of polyoxymethylene, is the key component of an automotive window regulator. Its function is to guide the window's movement, but it is prone to wear and tear. To reduce noise and improve the wear life of slider, a study of its contact characteristic and the wear life is significant. In this paper, the wear and friction properties of polyoxymethylene under dry sliding condition and grease lubrication condition are investigated using a pin-on-disc apparatus. The complex force conditions of the slider at the normal working condition are studied by a mechanics analysis method. The contact pressure of slider is analyzed by the finite element analysis and the wear of slider is calculated by the proposed wear prediction model. Prediction of the wear life of slider is verified by a window regulator wear experiment. Results show that the value of wear rate of polyoxymethylene under unlubricated condition is much higher than that under lubricated condition. The estimation of wear depth of slider, based on the combination of finite element contact pressure analysis and wear properties of polyoxymethylene, is in accordance with window regulator wear test under unlubricated condition. Besides, the practical wear depth of slider under grease lubrication condition is also in the range of the predicted wear depth of slider under dry and grease lubrication condition.