| Popis: |
Due to intensive development of multi-axle wheeled vehicles in the Russian Federation, there is a need to improve its performance characteristics such as flotation, which in turn increases the average speed of traffic in difficult conditions. Increasing the flotation and retain mobility in difficult road conditions is facilitated by intensive management of differential locking clutches. However, for a multi-axle wheeled vehicle, the number of differentials in the transmission makes the task of controlling the locking clutches difficult for the driver. The modern development of microprocessor technology allows the creation of automatic transmission control systems that implement the specified law of switching on and off the differential locking clutches. The method of definition of the law of control of differential locking clutches for a multi-axle wheeled vehicle is shown in the article. The research is carried out with the help of the mathematical simulation model of the curvilinear motion of the vehicle in the Matlab Simulink software package. The law of inclusion of clutches blocking is based on definition of a difference of speeds of rotation of output shafts of a differential and considers various radii of wheels rolling and also an opportunity of reliable switching of differential locking clutch. The sequence of switching on of clutches for locking different differentials in the transmission is determined. The law of deactivation of the differential lock is based on the criterion of maintaining the steering and maneuverability of wheeled vehicle, which contains of admissible increase in the turning radius by 10% in the case of a locked transmission with respect to the turning radius for the differential transmission at the same speeds and steering angles. Numerical simulation is carried out for curvilinear motion along different support surfaces of a wheeled vehicle 8 × 8, in the transmission of which there are 7 differentials. It is established that the creation of a control system based on the proposed law of wheeled vehicles differentials control can be realized without significantly complicating the construction of existing mechanical transmissions by installing additional speed sensors on output shafts of differentials. |
