Otis Singleton
Hybrid electric vehicles (HEVs) are automobiles that combine a conventional internal combustion engine with one or more electric engines. They are designed to achieve better fuel economy or acceleration performance than conventional vehicles. HEVs use two different power sources, typically a gas-powered engine and an electric motor, and can switch between the two to provide greater fuel efficiency. HEVs became widely available with the release of the Toyota Prius in Japan in 1997, and as of April 2020, over 17 million hybrid electric vehicles have been sold worldwide.
| Characteristics | Values |
|---|---|
| Type | Hybrid vehicle |
| Power Sources | Gasoline engine, electric motor |
| Fuel Economy | Better than conventional vehicles |
| Propulsion System | Combines internal combustion engine and electric engine |
| Battery | Charged through regenerative braking and internal combustion engine |
| Emissions | Lower tailpipe emissions than comparable gasoline engine vehicles |
| Cost | Higher initial cost, lower fuel costs |
| Range | Comparable to gasoline vehicles |
| Usage | Switches between power sources as needed |
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What You'll Learn
- Hybrid electric vehicles (HEVs) have an internal combustion engine and an electric motor
- HEVs can switch between power sources, providing greater fuel efficiency
- HEVs use regenerative braking to recharge their batteries
- HEVs can be more expensive than pure fossil-fuel-based vehicles
- HEVs have better fuel economy and/or acceleration than conventional vehicles
Hybrid electric vehicles (HEVs) have an internal combustion engine and an electric motor
Hybrid electric vehicles (HEVs) are a type of hybrid vehicle that combines 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 improved fuel economy and acceleration performance compared to conventional vehicles. HEVs use fuel as their primary power source and do not require external charging. The internal combustion engine drives an electric generator, which charges the battery and powers the motor that propels the vehicle. This combination enhances the engine's efficiency, and the power distribution allows the vehicle to achieve optimum power under most driving conditions.
HEVs can be classified as either mild or full hybrids, with full hybrids designed in series or parallel configurations. Parallel hybrids, the most common HEV design, mechanically couple the engine and electric motor to the wheels, with both driving the wheels directly. In contrast, mild hybrids, also known as micro-hybrids, use a battery and electric motor to assist in powering the vehicle and can shut off the engine when the vehicle stops, improving fuel economy. However, mild hybrids cannot solely rely on electricity for power.
The ICE in an HEV can be smaller, lighter, and more efficient than in a conventional vehicle. This is because the combustion engine is sized for slightly above-average power demand rather than peak power demand. The electric motor compensates for the loss in peak power output, allowing the ICE to operate within its most efficient range more frequently. This results in reduced idle emissions, as the combustion engine can be temporarily shut down at idle and restarted when needed, a system known as start-stop.
HEVs also utilise regenerative braking, capturing energy normally lost during braking by using the electric motor as a generator and storing the captured energy in the battery. This further improves fuel economy and reduces vehicle air pollution emissions. Additionally, the greater torque provided by the electric motor at low speeds enables HEVs to have a smaller engine, as the electric motor can propel the vehicle independently at these speeds.
While HEVs may be more expensive upfront due to extra batteries and electronics, they offer lower fuel costs over time. They also provide other benefits, such as reduced noise emissions, making them an attractive option for consumers and a core segment of the automotive market's future.
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HEVs can switch between power sources, providing greater fuel efficiency
Hybrid Electric Vehicles (HEVs) combine an internal combustion engine (ICE) with one or more electric motors. This combination of power sources enables HEVs to switch between the two, optimising fuel usage, increasing efficiency, and reducing emissions.
HEVs can switch to the electric motor at low speeds or when idling, allowing the vehicle to travel short distances on electricity alone and reducing fuel consumption. The electric motor takes over to provide power to the wheels, while the gasoline or diesel engine is used when higher speeds or more power are required, such as during acceleration or highway driving. This dual-power capability provides a smooth and efficient driving experience.
The regenerative braking system in HEVs further enhances fuel efficiency. When the driver applies the brakes, the electric motor works in reverse to generate electricity, which is then stored in the battery for later use. This regenerative braking system reduces brake wear, resulting in longer-lasting brake components and lower maintenance costs.
HEVs also reduce idle emissions by temporarily shutting down the combustion engine when the vehicle is idling, such as at a traffic light, and restarting it when needed. This "start-stop" system further contributes to the fuel efficiency of HEVs.
While HEVs typically cannot run solely on electric power and are still primarily gas-burning vehicles, their ability to switch between power sources provides significant fuel efficiency improvements over conventional vehicles.
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HEVs use regenerative braking to recharge their batteries
Hybrid electric vehicles (HEVs) use regenerative braking to recharge their batteries. This technology allows an electric motor to operate as a generator, converting kinetic energy (or motion) into electrical energy that is then stored in the vehicle's battery pack. This process occurs when the vehicle is slowing down, either by removing the foot from the accelerator or pressing the brake pedal.
Regenerative braking offers several advantages over conventional braking systems. Firstly, it increases the driving range of HEVs by minimising fuel consumption and extending battery life. The recaptured energy reduces the need for external charging, resulting in time savings and a more practical electric vehicle. Secondly, it slows down the vehicle faster than normal deceleration, reducing wear and tear on traditional brake components such as pads and rotors. This advantage leads to lower maintenance costs and improved vehicle efficiency.
The concept of regenerative braking is not new, with the first United States application seen in the 1967 AMC Amitron, a completely battery-powered urban car. Despite its early introduction, the technology was not widely adopted by American car companies at the time due to a lack of focus on fuel efficiency and environmental protection. It was later commercialised by Japanese manufacturers and licensed back to American companies for their hybrid car models.
Regenerative braking systems vary among manufacturers, each having its own "secret sauce". While the systems typically operate seamlessly in the background, some drivers may notice differences in brake pedal feel or deceleration rates compared to conventional braking. These variations are less pronounced in newer hybrid models, which have more responsive brake pedals that resemble those of traditional brakes.
Overall, the use of regenerative braking in HEVs is a significant step towards more sustainable personal transport. By recapturing and reusing energy, HEVs can minimise fuel consumption, reduce emissions, and extend their driving range. This technology plays a crucial role in the viability and practicality of electric vehicles, making them more attractive to consumers and contributing to a greener future for the automotive industry.
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HEVs can be more expensive than pure fossil-fuel-based vehicles
Hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (ICE) with one or more electric engines. They are designed to achieve better fuel economy or better acceleration performance than a conventional vehicle. HEVs can be more expensive than pure fossil-fuelled vehicles due to what is known as the "hybrid premium". This premium refers to the extra cost incurred by the inclusion of extra batteries, more electronics, and other design considerations.
The higher initial cost of HEVs is offset by their lower fuel costs over time. The length of time it takes for the lower fuel costs to compensate for the higher initial cost (known as the payback period) depends on usage—miles travelled, hours of operation, fuel costs, and government subsidies. While traditional economy vehicles often have lower direct costs for many users (before considering any externalities), HEVs can be more cost-effective in the long run.
For example, a 2006 article in Consumer Reports stated that HEVs would not pay for themselves over five years of ownership. However, this calculation included an error where the "hybrid premium" was charged twice. When this error was corrected, the Honda Civic Hybrid and Toyota Prius did have a payback period of slightly less than five years.
The higher initial cost of HEVs can be a barrier to their adoption, especially when gasoline prices are low. However, worldwide increases in the price of petroleum have made HEVs more attractive to consumers. HEVs are now perceived as a core segment of the automotive market of the future. As of April 2020, over 17 million hybrid electric vehicles have been sold worldwide since their inception in 1997.
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HEVs have better fuel economy and/or acceleration than conventional vehicles
Hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (ICE) with one or more electric engines. This combination results in better fuel economy and/or acceleration than conventional vehicles.
HEVs have an electric powertrain, which has inherently better energy conversion efficiency. This means that HEVs can achieve better fuel economy than conventional vehicles, as the electric motor can be used when the ICE has low efficiency and high emissions. The ICE in an HEV can be smaller and more efficient than in a conventional vehicle because it is sized for slightly above-average power demand rather than peak power demand. As a result, HEVs have lower fuel consumption and produce fewer vehicle air pollution emissions than conventional vehicles.
In addition, HEVs use energy recovery technologies such as motor-generator and regenerative braking to recycle the vehicle's kinetic energy into electric energy via an alternator, which is then stored in a battery pack. This further improves the fuel economy of HEVs. For example, a study by Lexus in 2018 found that their hybrid vehicle had 34% less fuel consumption than their conventional vehicle. Another study found that HEVs saved 23%-49% fuel compared to conventional vehicles.
However, it is important to note that HEVs typically have higher upfront costs due to extra batteries and electronics. The higher initial cost and lower fuel costs result in a trade-off that depends on usage, such as miles travelled and fuel costs. While HEVs may have higher upfront costs, their lower fuel costs can result in overall cost savings over time.
Overall, HEVs offer improved fuel economy and/or acceleration compared to conventional vehicles, contributing to reduced petroleum consumption and vehicle air pollution emissions.
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Frequently asked questions
Hybrid electric vehicles (HEVs) have both an internal combustion engine and an onboard electric power generation system. This allows the vehicle to switch between the two power sources, providing greater fuel efficiency than conventional gasoline vehicles.
Hybrid electric vehicles offer better fuel efficiency and longer ranges than electric vehicles. They are also more cost-effective than electric vehicles when considering fuel running costs. Additionally, hybrids have a strong focus on regenerative braking, which means their brake pads and rotors last longer than those of normal cars.
Hybrid electric vehicles use two different power sources: a gas-powered engine and an electric motor. They use one or both power sources for motivation, often using the electric motor at lower speeds and the engine at higher ones. The battery in a hybrid electric vehicle is charged through regenerative braking and by the internal combustion engine.
