Vehicle Architectures
What is the defining characteristic of a Battery Electric Vehicle (BEV)?
A BEV runs entirely on electricity stored in a large battery and has no method of charging from liquid fuels
What is the calculated "well-to-wheel" efficiency of a conventional ICE vehicle?
The overall well-to-wheel efficiency for a conventional gasoline vehicle is approximately 15%
How does a series hybrid utilize its internal combustion engine?
In a series hybrid, the ICE is used strictly as a generator to produce electricity for the battery and electric motor; it never directly drives the wheels
What is a micro hybrid, and what is its primary feature?
It is a vehicle equipped with an Integrated Starter Generator (ISG) and an automatic stop-start system that shuts the engine down when the vehicle is stationary
Which Sustainable Development Goal (SDG) is most directly supported by energy-efficient transport?
SDG 7 (Affordable and Clean Energy) is supported by increasing energy efficiency in the transport sector
How does a Plug-in Hybrid Electric Vehicle (PHEV) differ from a standard hybrid?
A PHEV features a larger battery that can be recharged by plugging into an external power source, whereas a standard hybrid charges only from the internal combustion engine (ICE) or regenerative braking
What is the "well-to-wheel" efficiency for an electric vehicle?
According to the source's calculation, the overall efficiency is approximately 14%, largely due to the 33% efficiency of electricity generation
What is the main advantage of a parallel hybrid architecture?
Both the engine and the electric motor are connected directly to the wheels, which eliminates the efficiency loss associated with converting mechanical power to electricity and back
Under what conditions will a stop-start system automatically shut down the engine?
The engine typically shuts down after 10 seconds of idling in neutral gear at a traffic signal or jam
How do electric vehicles support SDG 13 (Climate Action)?
EVs contribute to climate action by reducing greenhouse gas emissions and potentially cutting carbon dioxide levels in the air by half
What is the primary energy source for a Fuel Cell Electric Vehicle (FCEV)
An FCEV uses a hydrogen fuel cell to generate electricity for the motor through a chemical reaction
How does the efficiency of an electric motor compare to an internal combustion engine?
Electric motors are significantly more efficient, typically reaching around 90%, while gasoline engines average only about 20% to 30%
What defines a series-parallel (power-split) hybrid?
This system uses a planetary gear set to "split" engine power, sending a portion to the wheels and the rest to a generator to charge the battery
What is a mild hybrid (power assist hybrid)?
It is a hybrid where the electric motor provides assisting power for acceleration but cannot drive the vehicle on electricity alone
Why does the adoption of EVs lead to a decrease in waste oil dumping?
Electric vehicles do not have a crankcase and therefore do not require the engine oil changes that lead to hazardous waste oil disposal
What is an "in-wheel drive" configuration in electric vehicles?
It is an arrangement where the traction motor is placed directly inside the wheel, often using a thin planetary gear set to manage speed and torque
What system allows a vehicle to recapture energy that is normally lost as heat?
A regenerative braking system converts the vehicle’s kinetic energy back into electrical energy during braking and coasting
What is a complex (or compound) hybrid?
This architecture features two bidirectional power converters and allows three torque sources (engine and two motors) to propel the wheels concurrently
What is the typical energy saving for a full (strong) hybrid like the Toyota Prius?
A full hybrid can achieve energy savings of 30% to 50% compared to a conventional vehicle
What is the "challenging triad" that electric vehicles help resolve?
It is the three-part problem of economic growth, environmental pollution (greenhouse gases), and declining oil reserves
Why do BEVs require "advanced control electronics"?
They are necessary to manage the energy flow between the large battery, the high-power electric motor, and the vehicle's propulsion needs
What is the specific energy of gasoline compared to motive force conversion?
Gasoline offers about 12,000 Wh/kg, but due to ICE inefficiency, only about 2,400 Wh/kg is actually translated into motive force
Why is component sizing considered a "complex task" for complex hybrids?
Because the system must balance the ICE, multiple motors, battery, and gears across many possible operation modes
What power ratio characterizes a mild hybrid?
Mild hybrids typically have a ratio of electric-to-total power between 10% and 30%
Why are emissions from centralized power plants considered "easier" to manage than those from ICE vehicles?
Power generation at a centralized plant is more efficient, and its emissions can be controlled more effectively than the dispersed emissions from millions of individual internal combustion engines