Research of energetic and dynamic processes, which are carrying within hybrid vehicle aggregate & optimization of its characteristics, development technical decisions of designing commercial hybrid vehicle
State Higher Educational Institution “National Mining University”, Dnepropetrovsk, Ukraine, provides researches in the field of energetics and energy-saving technologies. The researches intended for development a hybrid vehicle, which will be optimal both in fuel consumption, power efficiency and ecological compatibility indexes comparing to the inner combustion power unit. The results can be used in transport vehicles for various purposes. The developed decisions make possible to decrease exploitation outlays by reducing fuel consumption and increasing efficiency of its utilization.
The tendency to join a hybrid drive based on purpose of industrialized countries to cut in their dependence from energy suppliers. Another point – ecological aspects, which become more and more important due to increasing of total amount of cars in the world and growing its availability.
The design of power units, which based on the inner combustion engines, has developed up to its limit. That is why its further improvement can not drastically increase a coefficient of efficiency. Present engine has a coefficient of efficiency at the rate of about 25-30% that is lay within the area of theoretical maximum. Another difficulty is impossibility to recuperate the accumulated kinetic energy in braking regime (the whole energy transforms into heat within braking system).
Meanwhile, the usage only the electric transport vehicle is economically unreasonable. It is based on the absence of infrastructure for charging accumulators and, actually, accumulators of reasonable price which fit the consumer wants. That is why the most perspective development direction in the nearest future is hybrid transport vehicles (Hybrid electric vehicle, HEV) and vehicles that plug in power grid (Plug-in Hybrid electric vehicle, pHEV).
Every leading auto-manufacture provides active researches in the field of hybrid transport vehicles. Nevertheless, there is no common notion about optimal topology of hybrid. Also, there is absent a universal approach how to choose optimal parameters of power unit (power of inner combustion and electric motors, capacity and power of batteries), which supply maximum vehicle efficiency in terms of reasonable original-operational cost ratio.
Obviously, there is need of scientific approach during designing a hybrid power unit with optimal performance characteristics and investments for spreading innovative technologies in everyday life.
In terms of project HIM-GDE (Hybrid Improved Motor – Green Driving Efficiency) there is planed to devise scientific-technical grounding how to select parameters of hybrid power unit with inner combustion engine in context of increasing efficiency, energy-saving, ecological compatibility and minimization of exploitation costs.
The achievement of these goals is provided by solving such scientific and applied tasks:
Ø The selection of the optimal design of the hybrid vehicle driver (parallel connection, series connection or mixed) and justification of hybridization degree, in which will be optimal relation between cost of the vehicle and its maintenance costs;
Ø To develop generalized mathematical model of hybrid vehicle with a glance to the specific characters of driving and running regime. For sure, the model have to account economical terms of vehicle maintenance;
Ø The researches of energetic & dynamics indexes of hybrid vehicle in parameter space of hybrid components (power, type, battery capacity and power) and calculation of these parameters by the multi-criteria methods of optimization for assurance maximum energy efficiency;
Ø The control law development of charging the intermediate storage, which provides the minimal energy consumption by primary source in high-efficiency vehicle driver;
Ø The control law development of hybrid aggregate in driving and braking regimes ensuring maximum performance, safety, ecological compatibility, fuel-energetic efficiency;
Ø The defining of technical characteristics and operational data of hybrid power aggregate;
Ø Development of technical decisions for ensuring reliability and minimal first price of hybrid aggregate.
The importance of this project in terms of solving ecological and economical problems consists in preparation of justified scientific-technological decisions for distribution the competitive hybrid aggregates in domestic market, which will meet the requirements of safety and environmental.