This study aims to delve into the nuances of energy consumption in Electric Vehicles (EVs) across varied driving conditions, including city, urban, and highway cycles. The primary focus is to discern the least energy-consuming cycle and identify the phases within each trip where energy consumption is most prominent. Using On-Board Diagnostics (OBD) programs on a real-time test subject EV, this research observes the energy consumption of EVs during different driving cycles. Energy consumption will be analysed in relation to parameters such as speed and acceleration, aiming to pinpoint precise values of energy consumption and identify the most efficient energy utilization in each cycle. In addition to speed and acceleration, this study aims to identify other factors influencing energy consumption, seeking to understand subtle details of each parameter’s effect.
Uncovering these intricacies is crucial for optimizing the energy consumption efficiency of EVs in diverse driving cycles. The outcomes of this investigation will serve as valuable insights for enhancing the overall efficiency of electric cars. As the world pro-grasses towards sustainable transportation, understanding how to optimize energy consumption in EVs becomes imperative for a more environmentally friendly future.
The real-time sample will be a Volkswagen ID.3 58 kWh (240 hp), complete electric vehicle with a net battery output of 55 kWh, a Lithium-ion (Li-Ion) battery located under the floor, based on RDE test, all-electric range of 421 km ideally, rear wheel drive with single speed transmission.
Table of Contents
1. INTRODUCTION
1.1 General Background:
1.2 Research Objectives:
1.3 Scope and Significance:
1.4 Methodology:
1.5 Contribution to Knowledge:
1.6 Ethical Considerations:
2. LITERATURE REVIEW
2.1 Introduction to Electric Vehicles (EVs)
2.2 Energy consumption valuation driving cycles.
2.3 Energy consumption calculation methods evolvement
2.3.1 Energy consumption calculation studies executed before 2000 CE
2.3.2 Energy consumption valuation studies until 2010 CE
2.3.3 Latest energy consumption methods
2.3.4 Previous studies benefits
2.3.5 Conclusion
2.4 Analysis of factors affecting the energy consumption of an EV
3. THE CONCEPT OF ELECTRIC VEHICLES
3.1 Evolution of Electric Vehicles
3.1.1 Difference between EVs & IC Engine cars
3.2 Types of Electric vehicles
3.2.1 Battery Electric Vehicles (BEVs)
3.2.2 Plug-in Hybrid Electric Vehicle (PHEV)
3.2.3 Hybrid Electric Vehicle (HEV)
3.2.4 Degree of Hybridization
3.3 Improving Efficiency in Electric Vehicles
3.4 Types of EV batteries
3.5 Electric Vehicle’s Motors
3.6 Single Speed Transmission System in EVs
3.7 Regenerative Braking System in EVs
3.8 Motor Controllers in EVs
3.9 SOC & SOH in EV Batteries
3.10 EV Thermal Management System
4. PRACTICAL EXPERIMENTS
4.1 Experiment subject EV
4.2 RDE experiment and results
4.3 Results from practical experiment
4.4 Vehicle speed results
4.5 EV motor speed evaluation
4.6 Acceleration
4.7 Motor characteristics
4.8 Energy consumption
5. CONCLUSION
Objectives and Topics
The primary objective of this thesis is to investigate and analyze the energy consumption of an electric vehicle across diverse real-world driving environments—specifically urban, rural, and highway cycles. By conducting an on-road Real Driving Emissions (RDE) test using an instrumented passenger electric vehicle, the research evaluates operational parameters such as speed, acceleration, motor revolutions, and battery voltage to ascertain how differing route dynamics influence overall efficiency compared to standardized laboratory test cycles.
- Evaluation of historical and contemporary driving cycles (e.g., NEDC, WLTP, FTP, ARTEMIS, RDE) used to determine vehicle efficiency and emissions.
- Theoretical examination of electric vehicle architecture, including electric motor designs, battery cell chemistries, single-speed transmissions, and thermal management systems.
- Analysis of external and behavioral factors influencing energy demand, including ambient temperature, HVAC utilization, aerodynamic drag, vehicle payload, road elevation, and driver aggressiveness.
- Empirical data acquisition via an On-Board Diagnostics (OBD-2) interface installed on a Volkswagen ID.3 operating along a designated test route in Wrocław, Poland.
- Comparative analysis between real-world energy consumption figures and manufacturer-provided WLTP ratings across distinct driving profiles.
Excerpt from the Book
3.7 Regenerative Braking System in EVs
The principle that energy can neither be created nor destroyed, only transformed, is the foundation of the regenerative braking system in EVs. When the brake is pressed, this system converts the kinetic energy from the car's movement into electric energy, which can then be stored in the battery.
In conventional vehicles without regenerative braking, pressing the brakes transforms kinetic energy into heat energy, which is wasted. However, in EVs, this kinetic energy is harnessed to recharge the battery. When the accelerator pedal is released, the car decelerates, causing the motor to slow down. The drive wheel, attached to the motor, remains in motion until it stops, during which the motor acts as a generator, converting kinetic energy into electric energy to store in the battery. This process involves the development of a back electromotive force (back EMF) as the vehicle decelerates. The electricity generated from this back EMF is stored in the battery, making the electric motor an energy recovery device during braking. Regenerative braking is applicable to BEV, HEV, and PHEV. The efficiency of energy capture during regenerative braking depends on how the driver operates the vehicle. Gradual deceleration allows for more energy capture, while abrupt braking is less efficient.[56]
Regenerative braking is especially effective on roads requiring frequent braking, such as urban areas, as it provides more opportunities for energy capture. The benefits of regenerative braking include energy savings and an extended driving range by topping up the battery on the go.
Typically, 16-70% of kinetic energy can be captured and stored, depending on factors such as braking force, braking power, battery charge level, and driving habits. However, regenerative braking has its limitations. At lower speeds, not enough kinetic energy is generated for efficient energy capture. At higher speeds, the system may not always bring the EV to an immediate halt, potentially compromising safety. Additionally, drivers accustomed to conventional braking systems may initially find regenerative braking pedals uncomfortable until they become accustomed to the new system. Overall, regenerative braking is transforming the concept of braking in vehicles, offering significant energy efficiency and sustainability benefits for electric vehicles.[57]
Chapter Summaries
1. INTRODUCTION: Introduces the background of electric mobility, outlines the research questions and objectives regarding driving cycle impacts on energy efficiency, and details the empirical methodology, scope, and ethical considerations of the study.
2. LITERATURE REVIEW: Surveys the historical evolution of driving cycles and analytical calculation methods from pre-2000 to modern adaptive frameworks, followed by a detailed review of external parameters influencing EV energy consumption such as temperature, auxiliary loads, and route topography.
3. THE CONCEPT OF ELECTRIC VEHICLES: Explores technical fundamentals of electric vehicle powertrains, contrasting ICEVs and various hybrid/battery electric configurations while examining core subsystems including battery chemistries, electric traction motors, transmissions, regenerative braking, controllers, and thermal management.
4. PRACTICAL EXPERIMENTS: Details the practical RDE experiment conducted in Wrocław using a Volkswagen ID.3, systematically presenting high-frequency telemetry data on vehicle speed, motor rpm, acceleration, torque, and power demand across urban, rural, and highway segments.
5. CONCLUSION: Synthesizes empirical findings across the three driving cycles, compares real-world results against manufacturer WLTP ratings, and proposes technical and infrastructure-level recommendations to minimize EV energy consumption and range anxiety.
Keywords
Electric Vehicles, Energy Consumption, Driving Cycles, Real Driving Emissions (RDE), WLTP, Volkswagen ID.3, Regenerative Braking, Motor Torque, Battery Management System, Thermal Management, Powertrain Efficiency, Urban Driving, Range Anxiety
Frequently Asked Questions
What is the core subject of this thesis?
The thesis investigates the operational energy consumption and powertrain dynamics of a modern battery electric vehicle (BEV) under real-world driving conditions across urban, rural, and highway driving segments.
What are the primary thematic areas addressed?
The work covers driving cycle standardization, EV powertrain engineering (motors, batteries, controllers, and transmission systems), external factors affecting energy demand, and empirical testing using vehicle telemetry.
What is the primary objective of this research?
The primary objective is to execute an experimental on-road test to determine the least and most energy-consuming driving cycles, identify driving phases with high power demands, and evaluate the variance between real-world consumption and manufacturer-specified ratings.
Which scientific methodology was used to conduct the study?
The author combined an extensive literature review of vehicle simulation models and driving cycles with an empirical Real Driving Emissions (RDE) road test in Wrocław, Poland, collecting real-time diagnostic data via an OBD-2 scanner over 8,624 sampling points.
What are the primary findings presented in the practical evaluation?
The experimental results showed that the urban cycle had the lowest energy consumption (11.799 kWh/100km) due to frequent regenerative braking, while the highway cycle consumed the most energy (14.515 kWh/100km) due to continuous high motor speeds and aerodynamic drag.
Which keywords best characterize the publication?
Electric Vehicles, Energy Consumption, Driving Cycles, VW ID.3, RDE Test, Regenerative Braking, WLTP, Powertrain Efficiency, and Battery Performance.
Which vehicle was used as the experimental test subject?
The practical test utilized a 2023 Volkswagen ID.3 equipped with a 58 kWh (55 kWh net) lithium-ion battery pack, a 150 kW (204 hp) electric motor, and a single-speed transmission driving the rear wheels.
Why was the urban driving cycle more energy-efficient than the highway cycle?
Although the urban cycle included 25 complete stops and significant stop-and-go driving, frequent deceleration events allowed the regenerative braking system to recuperate kinetic energy back into the battery, whereas high sustained speeds on the highway resulted in greater aerodynamic drag and minimal regenerative recovery.
How do ambient temperature and HVAC systems affect EV range according to the literature analysis?
The literature analysis revealed that sub-zero temperatures (e.g., -20°C to 0°C) increase battery energy consumption by 33% to 58%, with cabin heating (HVAC) increasing energy usage by 52% to 94%, significantly reducing total driving range.
- Quote paper
- Zhiran Ibrahim (Author), 2024, Analysis of Energy Consumption of an Electric Vehicle in Various Driving Cycles, Munich, GRIN Verlag, https://www.grin.com/document/1718750
