scholarly journals Drivability Optimization by Reducing Oscillation of Electric Vehicle Drivetrains

2020 ◽  
Vol 11 (4) ◽  
pp. 68
Author(s):  
Andreas Koch ◽  
Ludwig Schulz ◽  
Gabrielius Jakstas ◽  
Jens Falkenstein
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Electric Drive ◽  
Test Bench ◽  
Inverse Dynamics ◽  
Inertial Mass ◽  
Electric Machine ◽  
Combustion Engines ◽  
Hardware In The Loop ◽  
Internal Excitation

The drivetrain of electric vehicles differs significantly from vehicles with combustion engines. Current concepts of electric vehicle drivetrains usually have a low damping. Typically, there is no clutch to separate the inertial mass of the electric drive machine from the rest of the vehicle drivetrain. External (road unevenness, potholes, etc.) and internal excitation (torque changes of the electric machine, brake interferences, etc.) cause jerk oscillation and sometimes high component stress. These excitations can be reduced by suitable drivability functions, to which a reference filter can also be assigned. A common approach known from conventional drivetrains is to limit the gradient of the demand torque of the drive machine or the driver′s desired torque in order to influence the torque build-up of the drive machine and to reduce the excitation of jerk oscillations. A second approach is the use of a prefilter. The prefilter uses the inverse dynamics of the drivetrain to influence the demand torque of the drive machine. In this paper, the influence of a prefilter based on the inverse dynamics of electric vehicle drivetrains to reduce oscillations is investigated. In addition, an anti-jerk control enhances the drivability function afterwards. All investigations are made on a hardware-in-the-loop test bench to create reproducible results.

scholarly journals International Electric Vehicle Policies

2021 ◽  
Vol 23 ◽  
Author(s):  
Nicholas Taormina ◽  
Rahul Ainpudi
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Internal Combustion Engines ◽  
Daily Life ◽  
Modern Society ◽  
Combustion Engines ◽  
Environmentally Conscious ◽  
The World ◽  
The Relationship ◽  
Vehicle Market

This paper examines the relationship between legal policy and the Electric Vehicle market in countries from around the world. As climate change has become an increasingly more important issue in modern society, heavy emphasis has been placed on environmentally conscious alternatives to many things used in daily life. Transportation, one of the largest and most polluting sectors of the economy, has seen many advances towards an eco-friendly future. Electric Vehicles, or EVs, have been lauded as the answer to heavily-polluting Internal Combustion Engines (ICE) by governments around the world. They have dumped large amounts of money in the form of tax breaks and subsidies into the EV sector, but it is unclear if that is really having an effect on the market. This study finds no correlation between the amount of money a government is offering to subsidize the purchase of EVs and the EV market share of the country. While EV law structure varies heavily between countries, the general contribution to the sector by governments is largely the same around the world.

scholarly journals The efficiency of direct torque control for electric vehicle behavior improvement

2011 ◽  
Vol 8 (2) ◽  
pp. 127-146 ◽  
Author(s):  
Brahim Gasbaoui ◽  
Abdelkader Chaker ◽  
Abdellah Laoufi ◽  
Boumediène Allaoua ◽  
Abdelfatah Nasri
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Electric Drive ◽  
High Performance ◽  
Induction Motors ◽  
Direct Torque Control ◽  
Torque Control ◽  
Control Methods ◽  
Matlab Simulink ◽  
Safety And Stability

Nowadays the electric vehicle motorization control takes a great interest of industrials for commercialized electric vehicles. This paper is one example of the proposed control methods that ensure both safety and stability the electric vehicle by the means of Direct Torque Control (DTC). For motion of the vehicle the electric drive consists of four wheels: two front ones for steering and two rear ones for propulsion equipped with two induction motors, due to their lightweight simplicity and high performance. Acceleration and steering are ensured by the electronic differential, permitting safe and reliable steering at any curve. The direct torque control ensures efficiently controlled vehicle. Electric vehicle direct torque control is simulated in MATLAB SIMULINK environment. Electric vehicle (EV) demonstrated satisfactory results in all type of roads constraints: straight, ramp, downhill and bends.

scholarly journals Analysis of electric motor vehicles market

2019 ◽  
Vol 179 (4) ◽  
pp. 169-175
Author(s):  
Marta MACIEJEWSKA ◽  
Paweł FUĆ ◽  
Monika KARDACH
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Carbon Dioxide Emissions ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Low Noise ◽  
Motor Vehicles ◽  
Combustion Engines ◽  
The European Union

The increasingly restrictive standards related to exhaust emissions from cars make difficult the development of internal combustion engines. The activities undertaken in the design of internal combustion engines are mainly based on downsizing, e.g decreasing the engines displacement. The main direction in the development of vehicle propulsion is to reduce carbon dioxide emissions. It is expected to reduce CO2 emissions in 2020 to reach 95 g/km. Electric vehicles achieve low noise levels and do not emitted a burn, and thus, their use leads to a reduction in the amount of toxic exhaust gases in the air. The aspect of reducing emissions of harmful exhaust compounds and activities focusing on downsizing on the market of combustion engine cars leads to a significant increase the number of electric vehicles. In 2018 around 95 million motor vehicles were registered in the world, of which around 12 million in the European Union and 273 thousand in Poland. The number of electric vehicles among all sold is around 5.5%. Every year new, more technologically advanced models appear on the electric vehicle market. In 2018, the most popular model was the Nissan LEAF and the BAIC EC-Series. A large number of Renault ZOE have also been sold. In article analyzed different models of electric vehicle, which are available on market and presented the characteristics based on e.g. price per 100 kilometers, range for every model or charging time.

Dynamic Emulation of Tire/Road Friction for Developing Electric Vehicle Control Systems

2009 ◽  
Author(s):  
Chengbin Ma
Keyword(s):  
Control Systems ◽  
Electric Vehicle ◽  
Electric Vehicles ◽  
Internal Combustion Engines ◽  
Transient Behavior ◽  
Vehicle Control ◽  
Friction Model ◽  
Combustion Engines ◽  
Road Friction ◽  
Dynamic Emulation

Current researches on electric vehicles are focusing on the environment and energy aspects. However, electric motors also have much better control performance than the internal combustion engines. Electric vehicles could not only be “cleaner” and “more energy efficient”, but also become “safer” with “better driving performance”. In this paper, a discrete elasto-plastic friction model is proposed for a dynamic emulation of tire/road friction for developing control systems of electric vehicles. The friction model can capture the transient behavior of the friction force during braking and acceleration, therefore the model-based emulation could enable more reliable verifications for various electric vehicle control methods.

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