Over the last few years the number of vehicles equipped with an automatic transmission have increased substantially in Europe. Beneath the mechanical system needed for the shift operation there has to be an intelligent control module, which changes gears based on the observations of the environment. Therefore more recently a tread to electric transmission control units (ECU) can be observed. The advantage of such systems is that an intelligent environment dependent behavior can be implemented cost-effectively. This paper deals with the development of a ECU based on a fuzzy expert system. It can deal with varying conditions such as a changing environment due to the road gradient, changing driver's intention and mechanical limitations of the different components of the drive train. This paper presents an intelligent electronic transmission control system using both fuzzy logic and conventional methods. The controller is part of the drive train, therefore requiring that special attention is paid to the system's security. We propose two different methods to prioritize the controller outputs and show how these methods can be realized within fuzzy control theory. Next we show is an application how rules can be derived as a mixture of human expert knowledge and dynamic process models. The controller is tested in our simulation environment. The results are compared to those obtained by using conventional shift logic.
Fuzzy shift logic for an automatic transmision system
Automatisches Kraftübertragungssystem auf Basis von fuzzy-Logikschaltung
1993
8 Seiten, 10 Bilder, 17 Quellen
Conference paper
English
Fuzzy shift logic for an automatic transmission system
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