
Hybrid vehicles are those that use two or more distinct power sources. Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. The electric motor is more efficient at producing torque, while the combustion engine is better for maintaining high speeds. HEVs cannot be plugged in to charge the battery, but 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, better fuel economy, and reduced emissions. Diesel-electric hybrid vehicles are less common and are mainly found in locomotives and other heavy-duty applications.
Diesel-Electric Hybrid Vehicles
| Characteristics | Values |
|---|---|
| Definition | Vehicles that use two or more distinct types of power |
| Power Sources | Diesel and electricity |
| Examples | Submarines, cranes, locomotives, buses, trucks, mopeds, electric bicycles, cars, SUVs, military vehicles, ships |
| Benefits | Improved efficiency, lower emissions, reduced running costs, better fuel economy, improved performance, increased power and speed |
| Types | Mild hybrid, full hybrid, parallel hybrid, self-charging, plug-in hybrid |
| Examples of Car Models | Mercedes E-Class, BMW 5 Series, Mercedes GLE SUV, C 300de, BMW 3 Series, Audi A4, Honda Elantra, Hyundai, Kia, Toyota, Lexus, Ford Maverick, Audi Duo, Honda Civic Hybrid, Toyota Prius, Ford Escape Hybrid, Porsche Cayenne Hybrid, Volkswagen Touareg Hybrid, Jetta, Golf Hybrid, Passat, Range Rover Hybrid |
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What You'll Learn

How diesel-electric hybrid vehicles work
Hybrid vehicles use two or more distinct power sources. Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. The electric motor is more efficient at producing torque, while the combustion engine is better for maintaining high speeds.
HEVs cannot be plugged in to charge the battery. Instead, the battery is charged through regenerative braking and by the internal combustion engine. The vehicle captures energy normally lost during braking by using the electric motor as a generator and storing the captured energy in the battery. This results in better fuel economy without sacrificing performance.
There are different types of hybrid systems. Mild hybrids, also called micro-hybrids, use a battery and electric motor to help power the vehicle and can allow the engine to shut off when the vehicle stops, further improving fuel economy. Mild hybrid systems cannot power the vehicle using electricity alone. Full hybrids have larger batteries and more powerful electric motors, which can power the vehicle for short distances and at low speeds.
The most common HEV design is a parallel hybrid, where the engine and the electric motor are connected to the wheels through mechanical coupling. Both the electric motor and the internal combustion engine drive the wheels directly. Some vehicles use motor generators that perform both the drive and regeneration functions.
Diesel hybrids are less common, mainly found in locomotives and other heavy-duty applications. Examples of diesel-electric hybrid vehicles include the GM military light truck, the Mercedes-Benz Sprinter, the Micro-Vett SPA Daily Bimodale, the Isuzu Elf Diesel Hybrid Truck, and the Range Rover Hybrid.
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The benefits of diesel-electric hybrid vehicles
Hybrid vehicles use more than one means of propulsion, combining an internal combustion engine with one or more electric motors, which uses energy stored in batteries. Diesel-electric hybrid vehicles are therefore designed to offer diesel-level economy, with the ability to run on electric-only power in urban areas, reducing emissions from the diesel engine.
One of the main benefits of diesel-electric hybrid vehicles is their fuel efficiency. The extra power provided by the electric motor can allow for a smaller engine, improving fuel economy without sacrificing performance. The battery can also power auxiliary loads and reduce engine idling when the vehicle is stopped, further improving fuel economy. The electric motor is charged through regenerative braking and by the internal combustion engine, capturing energy normally lost during braking. This means that hybrids require fewer fuel stops on long journeys and offer a longer driving range than electric vehicles.
Another key benefit of diesel-electric hybrid vehicles is their reduced environmental impact. As well as reducing fuel consumption, diesel-electric hybrids also decrease CO2 emissions and local air quality-impacting emissions. This makes them ideal for people who split their time between urban and non-urban areas, where the hybrid system will reduce fuel costs and emissions in the city, while still being able to drive outside of urban areas.
Diesel-electric hybrid vehicles also offer a middle ground between combustion engines and full electric vehicles, making them a handy way to incrementally reduce emissions. This can be particularly useful for businesses looking to cut fleet emissions and avoid sanctions, while still maintaining the convenience of a combustion engine.
Finally, diesel-electric hybrid vehicles offer a usable amount of electric-only range with the convenience of a combustion engine. Plug-in hybrid vehicles can be run on electric power alone for long periods of time, avoiding regular trips to the fuel pump.
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Examples of diesel-electric hybrid vehicles
Hybrid vehicles are an ideal middle ground for drivers transitioning from traditional internal combustion engine (ICE) vehicles to fully electric vehicles (EVs). Diesel-electric hybrid vehicles combine a diesel engine with an electric motor, offering the benefits of electric power in the city and a diesel engine's efficiency on long motorway journeys.
Mercedes E-Class Estate
The Mercedes E-Class Estate is a stylish, practical, fast and comfortable diesel-electric hybrid vehicle. It offers an excellent electric-only range and a lofty driving position. However, it may not be the best choice for those seeking maximum boot space. The E-Class has a quiet engine and soft suspension, making it a delight to drive over long distances and on bumpy city roads.
Mercedes GLE SUV
The Mercedes GLE SUV is another option in the diesel-electric hybrid category. It shares the same 2.0-diesel hybrid system as the E-Class but in a taller SUV body. The GLE offers an impressive 65.9-mile electric range, one of the best among plug-in hybrid SUVs. It features elegant curvy bodywork and posh trim pieces, such as a big grille and swoopy silver trim on the front bumper. The interior is luxurious, with leather and wood accents and a minimalist, curved dual-screen setup.
Mercedes C 300de
The Mercedes C 300de is a diesel plug-in hybrid model that exudes a "mini S-Class" vibe. It has a swoopy centre console that rises onto the dashboard and a "floating" screen above the central air vents. While the infotainment system may not be as advanced as newer Mercedes models, the C 300de offers a more streamlined and intuitive experience. The smaller battery allows for up to 35 miles of electric-only range.
Peugeot 3008
The Peugeot 3008 is a diesel vehicle supported by an electric motor. While it may not have the same level of luxury or advanced infotainment system as the Mercedes models, it offers a practical and efficient diesel-electric hybrid option.
Citroën DS5
The Citroën DS5 is another diesel vehicle that utilizes an electric motor for added efficiency. Like the Peugeot 3008, it provides a more affordable and straightforward diesel-electric hybrid option without compromising on performance.
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The history of diesel-electric hybrid vehicles
Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. The battery in a hybrid electric vehicle cannot be plugged into a charging station; instead, it is charged through regenerative braking and by the internal combustion engine. This results in better fuel economy without compromising performance.
In the following years, several companies experimented with hybrid technology. Fischer Motor Vehicle Co. in Hoboken, New Jersey, produced and sold a petrol-electric omnibus in the United States and London, which included battery storage. In 1917, the Woods Dual Power Car had a driveline similar to the GMC/Chevrolet Silverado hybrid pickup truck.
Despite these early developments, the release of the first hybrid electric vehicles in the United States marked a significant revolution in the automobile industry. The advantages of hybrid vehicles, including increased fuel efficiency and reduced pollution, became clear. However, the adoption of hybrid technology was also influenced by various factors, such as the declining availability and rising prices of gasoline, especially in the US market.
Today, diesel-electric hybrid vehicles offer a combination of a diesel engine's efficiency on long journeys and the benefits of electric power in city driving. Mercedes is currently the only manufacturer producing diesel-hybrid cars, offering models such as the E-Class Estate and its GLE SUV sibling, which features a 2.0-diesel hybrid system and an impressive electric range.
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The future of diesel-electric hybrid vehicles
Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. The battery in a hybrid electric vehicle cannot be plugged in to charge; instead, it is charged through regenerative braking and by the internal combustion engine. The electric motor can also allow for a smaller engine and can power auxiliary loads, reducing engine idling when stopped. This results in better fuel economy without sacrificing performance.
Diesel hybrid cars combine a diesel engine with an electric motor, offering the benefits of electric power in the city and a diesel engine's efficiency on long motorway journeys. The majority of diesel hybrid cars use a plug-in hybrid system, which offers a usable amount of electric-only range with the convenience of a combustion engine. Plug-in hybrids can be run on electric power alone for long periods of time, avoiding regular trips to the fuel pump. Self-charging hybrids, on the other hand, are cheaper and simpler, with smaller battery packs, and their batteries are charged by the car's engine and regenerative braking. Diesel hybrid cars, therefore, offer the combined advantages of both electric and diesel engines, making them a good option for those who want to benefit from the strengths of both types of vehicles.
Despite the benefits of diesel-electric hybrid vehicles, there are some challenges to their widespread adoption. One major factor is cost. Diesel engines are significantly more expensive than their gasoline counterparts, and hybrids are also more costly than traditional vehicles. The complexity of the hybrid system also adds to the overall cost of the vehicle. Additionally, diesel-electric hybrids may not be as cost-effective as other alternatives, such as pure electric or gasoline-electric hybrids.
Currently, Mercedes is the only manufacturer producing diesel-hybrid cars, but their vehicles offer a good balance of performance and efficiency. The E-Class Estate, for example, is a stylish, practical, and comfortable option with an excellent electric-only range. The GLE SUV, which shares the same 2.0-diesel hybrid system, offers a 65.9-mile electric range, one of the best in its class.
Looking ahead, it seems that diesel-electric hybrid vehicles will continue to occupy a niche market. While they offer the benefits of both electric and diesel power, the high cost of diesel engines and the complexity of the hybrid system may deter some consumers. Additionally, the focus on reducing emissions and the development of more sustainable transportation options, such as pure electric vehicles, may shift the attention away from diesel-electric hybrids. However, for those who require the unique advantages of both electric and diesel power, diesel-electric hybrids may still hold appeal in the future.
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Frequently asked questions
A hybrid vehicle uses two or more distinct power sources. For example, submarines use diesel when surfaced and batteries when submerged.
Hybrid vehicles are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. The battery is charged through regenerative braking and by the internal combustion engine.
The primary benefit of hybrid vehicles is capturing and reusing braking energy that would otherwise be lost as heat and wear on the brakes. This recovered energy is then used to save fuel and increase miles per gallon.
Examples of diesel-electric hybrid vehicles include the 2011 Lincoln MKZ Hybrid, the Range Rover Hybrid, the C 300de diesel plug-in hybrid model, and the GLE SUV.











































