Otis Singleton
Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, with separate batteries for each. The electric motor improves fuel economy and can allow for a smaller engine. The battery is charged through regenerative braking and by the internal combustion engine. HEVs can be classified as mild hybrids, which use a battery and electric motor to help power the vehicle, or full hybrids, which have larger batteries and more powerful electric motors that can power the vehicle for short distances and at low speeds. Parallel hybrids, which can use the gasoline engine or electric motor to drive the car, are the most common type of HEV, while series hybrids, which use only the electric motor to drive the wheels, are more commonly found in plug-in hybrid electric vehicles.
| Characteristics | Values |
|---|---|
| Definition | A hybrid electric vehicle (HEV) is a type of hybrid vehicle that couples a conventional internal combustion engine (ICE) with one or more electric engines into a combined propulsion system. |
| Power Source | Both an internal combustion engine and an electric motor with separate batteries for each. |
| Fuel | Gasoline |
| Battery | Small high-voltage batteries that are charged through regenerative braking and by the internal combustion engine. |
| Types | Full hybrid, mild hybrid, series hybrid, parallel hybrid, plug-in hybrid (PHEV) |
| Examples | Toyota Prius, Peugeot 508 RXH HYbrid4, Ford Escape Hybrid, Honda Insight, Chevrolet Malibu hybrids |
| Sales Leader | Toyota Motor Corporation with more than 15 million Lexus and Toyota hybrids sold as of January 2020 |
| Benefits | Better fuel economy, lower carbon emissions, improved performance, longer brake pad life |
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What You'll Learn
- Hybrid electric vehicles (HEVs) have a gas-powered engine and an electric motor
- HEVs cannot be plugged in to charge the battery
- Mild hybrids, or micro hybrids, use a battery and electric motor to help power the vehicle
- Full hybrids have larger batteries and more powerful electric motors
- Parallel hybrids are the most common HEV design
Hybrid electric vehicles (HEVs) have a gas-powered engine and an electric motor
Hybrid electric vehicles (HEVs) are a type of vehicle that combines a conventional internal combustion engine (ICE)—which runs on gasoline—with one or more electric engines. The electric motor is powered by a battery, which is charged through regenerative braking and by the internal combustion engine. This combination of power sources allows for better fuel economy and improved performance compared to conventional vehicles.
HEVs come in different types, including mild hybrids, full hybrids, and plug-in hybrids. Mild hybrids, also known as micro-hybrids, use a battery and electric motor to assist in powering the vehicle, but they cannot be driven solely on electric power. Full hybrids, on the other hand, have larger batteries and more powerful electric motors, allowing them to run entirely on electric power for short distances and at low speeds. Plug-in hybrids, or PHEVs, have larger batteries than regular hybrids and can be plugged into the grid to recharge, offering greater electric range.
The most common form of HEV is the hybrid electric passenger car, but HEVs also include trucks, buses, motorboats, and aircraft. These vehicles can have different configurations, such as parallel hybrids, where both the electric motor and the internal combustion engine drive the wheels directly, and series hybrids, where only the electric motor drives the wheels. Parallel hybrids are the most common design.
HEVs offer several advantages over traditional internal combustion engine vehicles. They are more fuel-efficient, resulting in reduced petroleum consumption and lower vehicle emissions. Additionally, the substantial use of the electric motor at idling and low speeds leads to reduced noise emissions, benefiting roadway noise health effects. HEVs also utilise regenerative braking, capturing and storing energy that would normally be lost during braking, further improving their energy efficiency.
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HEVs cannot be plugged in to charge the battery
Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. Unlike battery-electric vehicles, HEVs cannot be plugged in to charge the battery. Instead, the battery is charged through regenerative braking and by the internal combustion engine. The extra power provided by the electric motor can allow for a smaller engine, improving fuel economy without sacrificing performance.
Regenerative braking is a key feature of HEVs, capturing and reusing braking energy that would otherwise be lost as heat and wear on the brakes. This energy is used to charge the battery, which can then power the electric motor(s) and delay the start of the gas engine, resulting in improved fuel economy and reduced carbon emissions. The computer monitors how hard the brake pedal is pressed, blending in traditional brakes during harder stops or emergencies.
While HEVs cannot be plugged in, there is a variation called a plug-in hybrid electric vehicle (PHEV) that offers the option of plugging in to charge. PHEVs can be confusing for shoppers because, even when not plugged in, they function as regular hybrids, recharging their batteries through regenerative braking or by siphoning power from the engine. PHEVs with larger batteries may offer more electric assistance and quicker acceleration, but they are also heavier, impacting fuel economy.
The main advantage of HEVs over PHEVs and battery-electric vehicles is their simplicity and lower cost. HEVs do not require specialised infrastructure for charging, making them a practical choice for those who live in apartments or have limited access to charging stations. Automakers also favour HEVs as a cheaper, less challenging way to comply with emission rules compared to full battery-electric vehicles.
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Mild hybrids, or micro hybrids, use a battery and electric motor to help power the vehicle
Hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (ICE) with one or more electric engines into a combined propulsion system. Mild hybrids, also known as micro hybrids, are a type of HEV that uses a battery and electric motor to support a conventional petrol or diesel engine, improving efficiency and reducing emissions. Unlike full hybrids, mild hybrids cannot be powered solely by their electric motor and must be supplemented by the combustion engine.
Mild hybrids generally have a small electric generator instead of a traditional starter motor and alternator, as well as a lithium-ion battery. They typically run on a 48-volt electrical system, which is higher than traditional combustion engine models, enabling the engine to operate more efficiently. The electric motor assists the engine during hard acceleration and helps the car's stop-start system operate more smoothly, allowing the engine to shut off when the vehicle stops, such as at traffic lights or in stop-and-go traffic. This improves fuel economy and reduces idle emissions.
Mild hybrid systems are relatively inexpensive to fit and reduce fuel consumption and CO2 emissions for petrol and diesel engines. They may employ regenerative braking to capture energy that would normally be lost during braking, using the electric motor as a generator to store energy in the battery for later use. This energy capture is also known as a motor-generator or range extender.
Examples of mild hybrids include the Toyota Crown executive sedan, the MINI and BMW start and stop models, and the Citroën C2 and C3.
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Full hybrids have larger batteries and more powerful electric motors
Hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (ICE) with one or more electric engines into a combined propulsion system. The electric powertrain has inherently better energy conversion efficiency, resulting in better fuel economy or better acceleration performance than a conventional vehicle.
HEVs can be classified as mild hybrids or full hybrids. Mild hybrids, also called micro hybrids, use a battery and electric motor to help power the vehicle. They are designed to allow the engine to shut off when the vehicle stops, improving fuel economy. However, they cannot be powered solely by electricity. In contrast, full hybrids have larger batteries and more powerful electric motors, enabling them to run entirely on electric power for short distances and at low speeds.
Full hybrids, sometimes called strong hybrids, can be designed in series or parallel configurations. In series hybrids, only the electric motor drives the wheels, and they are commonly found in plug-in hybrid electric vehicles. Parallel hybrids, the most common HEV design, connect the engine and the electric motor to the wheels through mechanical coupling, allowing both to drive the wheels directly.
Examples of full hybrid systems include Ford's hybrid system, Toyota's Hybrid Synergy Drive, Peugeot-Citroën's HYbrid4, and General Motors/Chrysler's Two-Mode Hybrid technologies. The Toyota Prius, Peugeot 508 RXH HYbrid4, Ford Escape Hybrid, and Ford Fusion Hybrid are all examples of full hybrids, capable of being propelled forward on battery power alone.
While full hybrids have larger batteries and more powerful electric motors than mild hybrids, it's important to note that the size and power of HEV batteries are different from those in pure electric vehicles (EVs). HEV batteries are designed to boost efficiency and provide brief spurts of peak power, so they are smaller, more compact, and lighter, with a different power-to-energy ratio.
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Parallel hybrids are the most common HEV design
Hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (ICE) with one or more electric engines to create a combined propulsion system. The electric powertrain has inherently better energy conversion efficiency, resulting in better fuel economy and improved performance.
HEVs can be classified as either mild or full hybrids, and full hybrids can be further categorized into series or parallel configurations. Mild hybrids, also called micro-hybrids, use a battery and electric motor to help power the vehicle. They cannot be powered solely by electricity and generally provide lesser fuel economy benefits than full hybrids. Full hybrids, on the other hand, have larger batteries and more powerful electric motors, allowing them to drive short distances and at low speeds using electric power alone.
Among full hybrids, the most common design is the parallel hybrid. In this configuration, both the ICE and the electric motor are connected to the mechanical transmission and can simultaneously transmit power to drive the wheels. The electric motor can also act as a generator for supplemental recharging of the vehicle's batteries. Parallel hybrids are more efficient than comparable non-hybrid vehicles, especially in urban stop-and-go conditions and during highway operation.
An example of a parallel hybrid is Honda's Integrated Motor Assist (IMA) system, found in the Insight, Civic, and Accord models. The IMA system uses a small electric motor and battery pack to supplement the main internal combustion engine, rather than being the sole source of motive power. Another example is the GM Belted Alternator/Starter (BAS Hybrid) system found in the Chevrolet Malibu hybrids.
Parallel hybrids offer flexibility in their design, allowing for different power levels and voltage ranges. They can be easily integrated into various types of hybrid vehicles, from mild to full and plug-in hybrids. Additionally, parallel hybrids can incorporate power-split devices, providing the option to transmit power mechanically or electrically to the wheels.
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Frequently asked questions
Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. They are often referred to simply as "hybrids".
Hybrid vehicles use two different power sources, typically a gas-powered engine and an electric motor. They carry a fuel tank and battery pack, the latter of which powers the electric motor(s). The electric motor is often used at lower speeds, with the engine taking over at higher speeds.
Hybrid vehicles capture and reuse braking energy that would otherwise be lost as heat and wear on the brakes. This saves fuel and increases MPG, reducing the driver's carbon footprint and saving them money.
The Toyota Prius is the world's best-selling hybrid electric vehicle. Other popular hybrid models include the Honda CR-Z, the Porsche Cayenne Hybrid, the Volkswagen Touareg Hybrid, and the BMW ActiveHybrid X6.
Plug-in hybrid electric vehicles have a larger battery and can be plugged into the grid to recharge, whereas regular hybrid vehicles recharge their batteries through regenerative braking. PHEVs can also travel further using solely electric power before the gasoline engine turns on.
