Avtomobilʹnyj Transport (Harʹkov) (Jun 2018)
THE RESEARCH OF BRAKING–STOP–START MODES OF CAR MOTION ON THE SLOPE
Abstract
Problem. The problem is the synthesis of a driver support automatic systems at the start and forming the basis for further research of dynamic processes for the transient motion modes. Goal. The goal is to study dynamic processes in braking-stop-start modes of a car moving aslope by simulation of dynamic behavior of the car and its steering control systems. Methodology. Structural simulation model of the braking-stop-start process of car motion has been realized in the Simulink application of the Matlab software and is presented by functional blocks simu-lating the process of dynamic state of the car and the working processes of transmission and brakes con-trol systems, the mathematical description of brak-ing-stop-start modes of car motion aslope has been made. Results. The suggested simulation model makes possible evaluation of parameters characterizing the dynamic behavior of the car with the given laws of fuel intake control, brake torque and torsion torque linked up with the driving wheels in different driving modes; simulation modes reflect the car deceleration by braking system up to its full stop on the slope, keeping the car motionless by the braking system and its start at connection by friction clutch of the engine and the transmission, the structural scheme of the model of the process of the car motion aslope has been performed. Scientific novelty. The prerequisites for formation of the basis for further research of the modes of the car dynamic state when starting the motion aslope have been substantiated, the methods of research of the car dynamic behavior when starting moving aslope have been built, it has also been determined that when the level of the fuel supply is enough for the car motion ahead, the law of the fuel intake change and the law of the clutch control have a small impact on the value of its rolling. Practical value. The results of the research can be used to extend the courses of students training in automobile specialties; the results of the simulation of the dynamic behavior of the car, as the functions of control system working processes, allow carrying on the research work on improving the automatic system of brake control when starting motion aslope.
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