Method of synthesis of patterns of power distribution between the driving wheels of all-wheel drive agricultural vehicles

Abstract

Justification: For the development of agriculture, which plays an important role in the country's economy, four-wheel drive trucks are needed, capable of interacting with various machines and aggregates, performing operations on off-road and public roads. The experience of their operation at agricultural enterprises shows an insufficient degree of realization of traction and speed properties, fuel efficiency and supporting cross-country ability. Serial power distribution systems in transmissions do not take into account the full range of factors affecting the movement of cars, which reduces the efficiency of their use.
 Objective: Scientific substantiation of the regularities of changes in the blocking properties of differentials depending on road, climatic and operational factors, as well as the development of methods for their implementation in the transmissions of four-wheel drive trucks.
 Methods: The research is based on the basic patterns of power distribution adapted to the operating conditions of a four-wheel drive truck. A step-by-step method for synthesizing the basic patterns of power distribution between the driving wheels of an all-wheel drive car and their adaptation to real driving conditions is proposed.
 Results: The method of synthesis of power distribution patterns is considered step-by-step, based on multi-criteria optimization. The design and operational factors that set the parameters of traffic on roads of all types and terrain have been established. The basic patterns of power distribution that ensure the efficiency, reliability and safety of the car are revealed. Depending on the functions, four-wheel drive trucks are conditionally divided into 4 groups with their own indicators and performance criteria. Based on the conducted research, 4 optimization problems are formulated.
 Conclusion: The authors have developed a methodology for determining the patterns of power distribution between the driving wheels of four-wheel drive trucks and their adaptation to traffic conditions. The main stages of the methodology are: formulation of the optimization problem; computational procedure and determination of basic patterns of power distribution; adaptation of basic patterns and evaluation of the effectiveness of solutions. Depending on the functionality, agricultural vehicles are divided into 4 groups, each of which has its own performance indicators: the weight of the transported cargo, the average speed of movement and energy costs. It is established that when modeling the movement of four-wheel drive trucks along the route, it is sufficient to use the differential equations of rectilinear motion.