Katerina Swanson
Hybrid vehicles use two power sources working together: a gasoline-fired internal combustion engine and an electric motor. This combination results in better fuel economy than a traditional gasoline-powered car. Hybrids carry a fuel tank and battery pack, with the latter powering the electric motor(s). The car can run on just the electric motor at low speeds, cruising, idling, or reversing. Full hybrids switch between power sources in mixed driving, resulting in improved fuel economy compared to a regular internal combustion engine-powered car. Plug-in hybrids are charged by plugging into the wall and can run on electricity alone, but mild hybrids have more modest batteries that can't produce any meaningful propulsion.
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What You'll Learn
Hybrid cars use two power sources
There are different types of hybrids, including full hybrids, mild hybrids, and plug-in hybrids. Full hybrids, also known as conventional hybrids or hybrid electric vehicles (HEV), use a gas engine assisted by an electric motor to achieve excellent fuel economy. They can switch between gas-only, gas-hybrid, and hybrid-only operation. Mild hybrids have modest 48-volt batteries that don't contribute significantly to propulsion but assist the gas engine, making it more efficient. Plug-in hybrids have larger battery packs that can be charged by plugging into an electrical outlet, allowing them to run on electricity alone for a certain range before the gas engine kicks in.
Regenerative braking, or "regen," is another important feature in hybrid cars. During braking, the electric motor scavenges electricity, which is then stored in the battery for reuse when accelerating. This process further improves the fuel economy of hybrids, especially in city driving.
In terms of fuel, hybrid cars typically use gasoline, and you can fill them up at any gas station. It is recommended to use top-tier unleaded gasoline with an octane rating of 87 or higher to ensure optimal performance and avoid engine damage. Some hybrids may also use diesel fuel, but these are less common and mainly found in locomotives and other heavy-duty applications.
NASCAR Fuel Capacity: Gallons of Gasoline Stored
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$82.32 $105
Electric motors and regenerative braking
Hybrid vehicles use two power sources working together: an internal combustion engine (ICE) and an electric motor. The electric motor is powered by a battery pack. The car can run on just the electric motor at low speeds, when cruising, idling, or reversing. Full hybrids switch between power sources in mixed driving, resulting in improved fuel economy compared to a regular ICE-powered car.
Regen is a natural outgrowth of how electric motors function. When electricity is put into an electric motor, it moves (or helps move) the car. A computer always monitors how hard you press the brake pedal, so it will blend in the traditional brakes—the pads and rotors—during harder stops and in emergency situations. This regen-first approach maximises the collection of electricity for propulsion so that fuel economy soars.
Regen is a basic element that all hybrids share, but differences arise when it comes to the usage of their gasoline engines. Parallel hybrids are the most common type, as they are set up to use either the gasoline engine or the electric motor to drive the car. They can also engage both at once. The electric motor is used at lower speeds because that's when their high initial torque and efficiency can make the best use of the limited battery energy. After a delayed restart, the gasoline engine joins in and eventually takes over as speed climbs and settles into a cruise, at which point the engine is in its sweet spot.
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Gasoline engines
Hybrid cars use two different power sources: an internal combustion engine and an electric motor. The internal combustion engine in hybrid cars is gasoline-fired. In the United States, hybrid automobiles use gasoline and do not require diesel. Hybrid cars do not need to be plugged in to charge, unlike electric cars.
Full hybrids, also known as conventional hybrids or hybrid electric vehicles (HEV), use a gasoline engine assisted by an electric motor to achieve excellent fuel economy. They can switch between gas-only, gas-hybrid, and hybrid-only operation. The electric motor gets the nod at lower speeds because that's when their high initial torque and efficiency can make the best use of the limited battery energy. After a delayed restart, the gasoline engine joins in and eventually takes over as speed climbs and settles into a cruise, at which point the engine is in its sweet spot. Parallel hybrids are the most common type, as they are set up to use the gasoline engine or the electric motor to drive the car. They can also engage both at once.
Mild hybrids have modest 48-volt batteries that can't produce any meaningful propulsion. Such systems are, however, topped up by regeneration, and they combine the starter and alternator into one unit that can seamlessly start the engine. While they use a small electric motor, it typically doesn’t help with the propulsion of the vehicle. Instead, it takes some of the work away from the gas engine to make it more efficient.
Plug-in hybrids have both a gasoline engine and electric motor, like full hybrids, except the onboard battery can be recharged externally at a charging station. They have larger lithium-ion battery packs on board, which are charged by plugging into the wall. When the battery is drained, it works like a conventional full hybrid.
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Plug-in hybrids
Hybrid vehicles use two power sources working together: a gasoline-fired internal combustion engine and an electric motor. Plug-in hybrids, also known as plug-in hybrid electric vehicles (PHEVs), are a type of hybrid with a larger onboard battery pack that can be charged by plugging into an electrical outlet or charging station. This allows the vehicle to be propelled by electricity alone, without using the internal combustion engine, until the battery is depleted. Once the battery is drained, the vehicle functions like a conventional hybrid, with the internal combustion engine taking over or generating electricity for the electric motor.
The larger battery pack in plug-in hybrids offers several advantages over conventional hybrids. Firstly, it enables all-electric operation, resulting in improved fuel economy and reduced fuel costs. Plug-in hybrids use roughly 30% to 60% less petroleum than conventional vehicles, and using electricity is usually cheaper than gasoline. Secondly, plug-in hybrids typically emit less greenhouse gas than conventional vehicles, although the amount depends on how the electricity is produced. For example, nuclear and hydroelectric plants are cleaner energy sources than coal-fired power plants.
However, there are also some drawbacks to consider. Plug-in hybrids tend to have higher vehicle costs, with prices \$4,000 to \$8,000 higher than comparable non-plug-in hybrids. Additionally, recharging the battery takes a significant amount of time, ranging from one to several hours depending on the type of outlet and charger used. Overall, a plug-in hybrid is most suitable for those with regular access to a power outlet or charging station, such as a garage with charging facilities.
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Fuel-cell hybrids
Hybrid vehicles use two power sources working together: an internal combustion engine (ICE) and an electric motor. The most common type of hybrid is a parallel hybrid, which can use either the gasoline engine or the electric motor to drive the car and can also engage both at once. Full hybrids can switch between gas-only, gas-hybrid, and hybrid-only operation. Mild hybrids, on the other hand, have modest 48-volt batteries that cannot produce any meaningful propulsion and are topped up by regeneration. Plug-in hybrids have larger lithium-ion battery packs that can be charged by plugging them into the wall.
The most common type of fuel cell for vehicle applications is the polymer electrolyte membrane (PEM) fuel cell. In a PEM fuel cell, an electrolyte membrane is sandwiched between a positive electrode (cathode) and a negative electrode (anode). Hydrogen is introduced to the anode, and oxygen is introduced to the cathode from the air. An electrochemical reaction aided by a catalyst causes the hydrogen molecules to break apart into protons and electrons. The protons then travel through the membrane to the cathode, while the electrons are forced to travel through an external circuit to provide power to the electric motor. Finally, they recombine with the protons on the cathode side, where, along with oxygen molecules, they form water.
Examples of hydrogen fuel-cell vehicles include the Toyota Mirai, the Honda Clarity Fuel Cell, and the Hyundai Nexo SUV. Toyota is the company most devoted to hydrogen power as an alternative to battery-electric vehicles, and the Mirai is the best-selling hydrogen car in the US. However, Honda has now ended production of the Clarity, and Hyundai has sold only about 1600 Nexo SUVs in six years.
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Frequently asked questions
Hybrid cars use two power sources working together: a gasoline-fired engine and an electric motor.
A full hybrid, also known as a conventional hybrid or hybrid electric vehicle (HEV), uses a gas engine assisted by an electric motor to achieve excellent fuel economy.
A plug-in hybrid electric vehicle (PHEV) has a larger onboard battery pack that can propel the car on electricity alone. When the battery is drained, it works like a full hybrid.
