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Science and Technology on vehicle transmission laboratory China north vehicle research institute,Abstract -A simulation model was built by means of Matlab/Simulink in order to study the launch process for a heavy duty truck equipped with a dual clutch transmission (DCT). Clutch thermal problem is a challenge for further application of DCT on heavy duty vehicles. A fuzzy control method with full consideration of clutch critical thermal energy value was proposed. In order to further reduce the friction work on the clutch during launch process, an improved control method was proposed, which involves two clutches participation during launch process. Two clutches participation can share the total friction work, thus decreases the risk of clutch warping, deformation and erosion. Simulation results show that this control method can result into better launch quality. The simulation model and proposed control strategies can provide a useful engineering tool for further development of such transmission.

To evaluate the state of rolling bearing more accurately, a new feature called composite multiscale weight slope entropy was proposed for the complexity measurement of vibration signals. On the basis of analyzing the fault signal structure, the new feature could consider the influence of the nonlinearity, the multiscale characteristics, the fluctuation of the amplitude, and the amplitude itself on the fault signals. In the following, different fault types and the corresponding damage degree of rolling bearings were identified with the hierarchical prototype-based approach. Compared with the results of different modified slope entropy, it is shown that composite multiscale weight slope entropy could significantly improve the identification accuracy. In the two designed testing schemes, ten and sixty state types of rolling bearings are respectively calculated, and the identification accuracy could reach up to 100% and 96.5% respectively, which illustrate the effectiveness and the validity of the proposed approach.

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