PHEV

A plug-in hybrid electric vehicle (PHEV) is a hybrid electric vehicle whose battery pack can be recharged by plugging a charging cable into an external electric power source, in addition to internally by its on-board internal combustion engine-powered generator. Most PHEVs are passenger cars, but there are also PHEV versions of commercial vehicles and vans, utility trucks, buses, trains, motorcycles, mopeds, and even military vehicles.

Similar to all-electric vehicles (BEVs), PHEVs displace greenhouse gas emissions from the car tailpipe exhaust to the power station generators powering the electricity grid. These centralized generators may be of renewable energy (e.g. solar, wind or hydroelectric) and largely emission-free, or have an overall lower emission intensity than individual internal combustion engines. Compared to conventional hybrid electric vehicles (HEVs), PHEVs have a larger battery pack that can be charged from the power grid, which is also more efficient and can cost less than using only the on-board generator, and also often have a more powerful electric output capable of longer and more frequent EV mode driving, helping to reduce operating costs. A PHEV's battery pack is smaller than all-electric vehicles for the same vehicle weight (due to the necessity to still accommodate its combustion engine and hybrid drivetrain), but has the auxiliary option of switching back to using its gasoline/diesel engine like a conventional HEV if the battery runs low, alleviating range anxiety especially for places that lack sufficient charging infrastructure.

Mass-produced PHEVs have been available to the public in China and the United States since 2010. By the end of 2017, there were over 40 models of highway-legal series-production PHEVs for retail sales, and are available mainly in China, Japan, the United States, Canada and Western Europe. The top-selling models are the Mitsubishi Outlander P-HEV, the Chevrolet Volt family and the Toyota Prius PHV. ''See also detailed 2016 sales and cumulative global sales in the two graphs.''

, the global stock of PHEVs totaled 2.4 million units, representing one-third of the stock of plug-in electric passenger cars on the world's roads. ''See Statistical annex, pp. 247–252 (See Tables A.1 and A.12). The global stock of plug-in electric passenger vehicles totaled 7.2 million cars at the end of 2019, of which, 47% were on the road in China. The stock of plug-in cars consist of 4.8 million battery electric cars (66.6%) and 2.4 million plug-in hybrids (33.3%). In addition, the stock of light commercial plug-in electric vehicles in use totaled 378 thousand units in 2019, and about half a million electric buses were in circulation, most of which are in China.'' , China had the world's largest stock of PHEVs with 767,900 units, followed by the United States with 567,740, and the United Kingdom with 159,910.

Terminology

A plug-in hybrid's all-electric range is designated by PHEV-'' iles' or PHEV'' ilometers'km in which the number represents the distance the vehicle can travel on battery power alone. For example, a PHEV-20 can travel twenty miles (32 km) without using its combustion engine, so it may also be designated as a PHEV32km.

For these cars to be battery operated, they go through charging processes that use different currents. These currents are known as Alternating Current (AC) used for on board chargers and Direct Current (DC) used for external charging.

Other popular terms sometimes used for plug-in hybrids are "grid-connected hybrids", "Gas-Optional Hybrid Electric Vehicle" (GO-HEV) or simply "gas-optional hybrids". GM calls its Chevrolet Volt series plug-in hybrid an "Extended-Range Electric Vehicle".

History

Invention and early interest

The Lohner-Porsche Mixte Hybrid, produced as early as 1899, was the first hybrid electric car. ''See year 1898''. Early hybrids