Analysis of vehicles drive with different characteristics of power supply
Date
2022-02-22
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Видавництво Львівської політехніки
Lviv Politechnic Publishing House
Lviv Politechnic Publishing House
Abstract
The characteristics of internal combustion engines (hereinafter referred to as ICE)
have the following disadvantages: there is a gap between zero and minimum angular velocity, so it is
impossible to move out of a state of rest; the dependence of torque on angular velocity is not ideal.
They are corrected by the following converters: the first by a clutch or torque converter, and the
second by a gearbox or variator. In addition, the ICE characteristics can be partially close themselves
to ideal.
Electric motors (here in after referred to as motors) of electric vehicles have an ideal
characteristic that starts from scratch and has a large zone with a sustainable maximum power. The
addition of the drive with the ICE motor in hybrid electric cars solves these problems.
The different characteristics of ICE, motors and converters increase the number of possible
configurations that affect the characteristics of the supply of power to the wheels.
According to the traction characteristics of the car, the indicators of the traction and speed
properties of the car are determined: the ability to overcome climbs, maximum acceleration,
maximum speed on a horizontal road, acceleration time to a given speed, etc. The last two indicators
depend primarily on the maximum power of ice or motor and are important for supercars, while for
conventional cars or electric vehicles with close values of maximum speed and acceleration time to a
given speed, they mean nothing.
The authors propose to evaluate the efficiency of the drive during acceleration with maximum
acceleration of the power utilization factor kN 0–100 – the particles from the division of the average
value of the realized power on the wheels in the interval of speeds (0; 100) km/h by the maximum
power value on the wheels.
The characteristics of ICE and motors are given, traction characteristics in power coordinates
are calculated – the speed of movement of cars with typical drive configurations, their power
utilization coefficients are determined and appropriate conclusions are made. In the future, it is
planned to investigate the use of power in more complex drive systems of hybrid cars with the
recovery of braking energy.
Description
Keywords
engines, characteristics of power supply, traction characteristics, power use
Citation
Myskiv T. Analysis of vehicles drive with different characteristics of power supply / Teodozii Myskiv, Oleg Sorokivskyi // Ukrainian Journal of Mechanical Engineering and Materials Science. — Lviv : Lviv Politechnic Publishing House, 2022. — Vol 8. — No 1. — P. 30–37.