Rational acceleration control of an all-wheel drive vehicle

Abstract

Problem. The improvement of ability rating of vehicles is a topical task which provides the promptness of transportation, improves the performance efficiency of vehicles by means of increasing the vehicle average speed. High dynamic characteristics are provided by mounting the powerful power units and by using the combined propulsion systems and powering cars recently. Using cars with driving wheels’ electric drive helps not only decrease energy consumption, but also increases car stability by regulating distribution of traction moments between the front and rear axles. Goal. The goal is to increase the course-keeping ability and power efficiency during the acceleration of all-wheel drive electric cars. Methodology. The provision of stability of vehicle movement is reached by the redistribution of total tangential reaction of a vehicle wheels. The power consumption of a power unit is determined with the help of rational law of the acceleration ramp changing during the acceleration that provides the most possible increase of line speed. Results. The relations allow to create the algorithm of control of vehicle front and rear wheels’ electric motors during the acceleration with the minimum of additional engine power consumption while accelerating with the maximum intensity that can be implemented both for electric cars and for cars with combined propulsion systems. Originality. The laws of driveline engine tractive effort torque control during the acceleration are obtained at the limit of a clutch fade of drive wheels with the road that determines the performance of maximum acceleration by cars. Practical value. Increasing of vehicle energy efficiency and providing of safety of traffic.Key words: electric car; stability of movement; power consumption; tractive effort torque.