ENERGY EFFICIENCY OF VEHICLES WITH COMBINED ELECTROMECHANICAL DRIVE OF DRIVING WHEELS Kharkov National Auto and Highway Univ

Format:

Book

Conference/Event

Author/Creator:

Podrigalo, Mikhail, author.

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

The use of a combined electromechanical drive of vehicle driving wheels will allow to realize the possibilities of a continuously variable transmission. In this case, the use of various differential mechanisms that summarize the movement from the internal combustion engine (ICE) and the electric motor will reduce the unevenness in time of the traction force to the drive wheels. Increasing the energy efficiency of hybrid cars is also possible by ensuring the engine runs at a constant high-speed mode. This article presents the results of evaluating the reduction of energy losses during acceleration of the vehicle and engine operation at a constant speed. Energy savings are 4-6% for cars and up to 17% for trucks. Acceleration of vehicle during the operation of the internal combustion engine at a constant speed is due to the acceleration of electric motors. If you install the electric motor parallel to the gearbox and summarize the movements at its output, then in the formed two in-line gearbox during acceleration of vehicle, the reduction of the gear ratio will occur. In the article, the law of changing the specified gear ratio during acceleration is determined and the restrictions on the condition for preventing slipping of driving wheels are determined. The torque of the internal combustion engine oscillates in one operation cycle. This entails a fluctuation in the angular velocity of the crankshaft. Therefore, for ICE, the concept of "constant angular velocity" is conditional. In fact, depending on the number of cylinders and the average value of the specified angular velocity of the crankshaft, the instantaneous value of the angular velocity varies within certain limits. Evaluation of the limits of fluctuation of the angular velocity of the crankshaft with a constant average value allows it to ensure the stability of the internal combustion engine. The article provides an assessment of the stability of the internal combustion engine at steady and unsteady (with increasing fuel supply) operating modes

Notes:

Vendor supplied data

Publisher Number:

2020-01-2260

Access Restriction:

Restricted for use by site license