Problems of using active-recuperative suspension and ways to solve them

The aim of the work is to reveal the unobvious disadvantages of active-recuperative suspension, as well as to identify possible options for dealing with them. Such problems are the danger of suspension breakdown in the active mode, the impossibility of operating in the regenerative mode when the suspension deformation rate is below the threshold, and the system operation in swing mode. The novelty of the work lies in the fact that these aspects of the functioning of the active-recuperative suspension system were not previously considered. The problem of the increased risk of suspension breakdown is that in the active mode, the deformation of the elastic device occurs not only due to the work of external disturbance (road irregularities), but also due to the work performed by the actuator. The following solutions are offered: correct selection of system parameters; collection of additional information about the roughness profile; introduction of preventive measures into the control algorithm. The problem of the impossibility of operating in a regenerative mode at a suspension deformation rate below the threshold is that the electromotive force of induction on the rotor winding at low speeds may be lower than the threshold charging voltage at the terminals of the energy storage device. The following solutions are offered: dry friction in the suspension; introduction of a shock absorber with a pronounced degressive characteristic into the suspension structure; lowering the charging threshold voltage by separating the supply and charging circuits using a voltage converter; introduction of a “scattering chain” into the armature chain; optimal control of the excitation circuit. The problem of the system operation in the swing mode is that, under certain conditions, energy is supplied to the oscillatory system through the actuator, resulting in a gradual increase in the oscillation amplitude. The following solutions are proposed: the introduction of an additional damper or regenerative connection on the deformation rate of the suspension.</jats:p

Energy saving technologies and energy efficiency of motor transport power plants

The perspective energy sources alternative to hydrocarbons, which are currently used in the world, are considered. Energy-saving technologies for the use of hydrocarbon fuel in vehicles are analyzed.&#x0D; The need to develop the use of electric drives on automobiles is noted. The importance of systematical accumulation and analyzing of the existing experience of operating vehicles with electric drives abroad and in the Russian Federation is considered. Monitoring the technologies developed abroad and the problems arising during the operation of electric vehicles will make it possible to determine the priority ways of their development and to concentrate the efforts of researchers in the direction ensuring the maximum efficiency of their application.&#x0D; One of the currently attractive and economically viable ways of developing road transport for domestic practice is the use of vehicles with hybrid power plants. It is shown that the production of hybrid vehicles and electric vehicles abroad is successfully developing and is nowadays one of the most dynamic in the world.&#x0D; Indicators of efficiency of electric power consumption of vehicles with electric drive of various automobile manufacturers are given. A comparative analysis of technologies for the use of electric automobiles to improve the environmental situation in megalopolises is carried out and the problems of increasing the efficiency of automobile power plants are considered.&#x0D; It is shown that the climatic conditions of the Russian Federation with long periods of low temperatures of atmospheric air strongly affect the energy losses associated with heating the passenger compartment, and to a large extent - on the energy efficiency of the power plant of electric vehicles.&#x0D; To assess the efficiency of using electric vehicles, it is proposed to use a universal indicator of the efficiency of energy consumption. It is proposed to carry out a comparative assessment of the energy consumption of various vehicles by the energy parameter qEL.&#x0D; The calculated data show that the use of vehicles with electric drive and, in particular, rechargeable hybrids is more profitable in comparison with the use of vehicles equipped exclusively with internal combustion engines.</jats:p