Hybrid-electric vehicles (HEVs) are offered by numerous auto manufacturers and more are being made available each year. Today, most people have heard of a hybrid-electric vehicle and many people have a basic understanding of how they work. HEVs are efficient vehicles that use a small motor and an electric engine to generate the power to drive the vehicle.
Clean Cities embraces hybrid vehicle technologies because they offer reduced emissions, and due to their high-fuel economy, help reduce our nation’s dependence on foreign oil.
Hybrid electric vehicles (HEVs) typically combine the internal combustion engine of a conventional vehicle with the battery and electric motor of an electric vehicle. The combination offers low emissions, with the power, range, and convenient fueling of conventional (gasoline and diesel) vehicles, and they never need to be plugged in. The inherent flexibility of HEVs makes them well suited for fleet and personal transportation.
Hybrid electric vehicles (HEVs) are powered by two energy sources—an energy conversion unit (such as a combustion engine or fuel cell) and an energy storage device (such as batteries or ultracapacitors). The energy conversion unit may be powered by gasoline, methanol, compressed natural gas, hydrogen, or other alternative fuels. Hybrid electric vehicles have the potential to be up to two times more fuel-efficient than conventional combustion engines.
HEVs can have a parallel design, a series design, or a combination of the two.
Parallel Design: This is the most common HEV design. Both the internal combustion engine (ICE) and the electric motor are connected to the wheels through mechanical coupling, and both engines drive the wheels directly. Typically, the electric motor runs at lower speeds typical of city driving and the ICE is activated at higher speeds.
Series Design: In a series design, only the electric motor drives the wheels and an internal combustion engine (ICE) is used to generate electricity for the motor. The series design can also be used in conjunction with parallel design in HEVs, using the series design at low speeds and the parallel design for highway driving and acceleration.
There are numerous light-duty HEVs available for purchase today. They include cars, trucks, and even sport utility vehicles. More hybrids are due on the market very soon! Hybrids qualify for tax incentives and can be very comparably priced to other conventional vehicles. In addition, there are several options for purchasing heavy-duty HEV buses, trucks, and shuttles. Search for HEVs by using the Hybrid Electric Vehicle Search.
Learn more about how hybrids work through the following links:
HEV Basics – Information from the Department of Energy on HEVS
How Hybrids Work – An interactive tool to visualize how hybrids components work
