Chevrolet

Chevrolet Volt

The Chevrolet Volt is an electric car with a gasoline range extender generator that was produced by General Motors and marketed by Chevrolet. The first generation of the Chevrolet Volt, it was manufactured at the Detroit facility until it was succeeded by the second and final generation of the Volt in 2015. It is a five-door liftback with a range-extending generator. In 2006, under the direction of GM Vice President Robert Lutz, General Motors began development of a car to rebuild their "environmentally-friendly, technologically advanced" image following the setback of the unsuccessful EV1 program. The project sought to establish a new family of common powertrain components for electric propulsion, known as the "E-Flex Systems" or "Voltec". This powertrain was versatile enough to accommodate various electricity-generating systems, such as gasoline, diesel, ethanol, or fuel cell-powered engines. A lithium-ion battery pack with a 16 kWh energy storage capacity was selected to provide a target all-electric range of 65 km (40 miles). The Volt concept car became the first application of the E-Flex propulsion system. This drivetrain comprises an electric motor, a lithium-ion battery pack, and a genset with a small combustion engine. Official series manufacture of the car at the Detroit/Hamtramck Assembly began on November 30, 2010. In place of the "Chevrolet Volt" nameplate, the Australasian markets received the Holden Volt, which was produced between 2012 and 2015. In numerous European markets, the Opel/Vauxhall Ampera was introduced, featuring various visual modifications to differentiate it from the Volt. Nevertheless, the Chevrolet Volt continued to be sold in Europe, albeit in lower volumes. The Chevrolet Volt functions as a battery electric vehicle until its battery capacity diminishes to a predefined threshold from full charge. At that point, its internal combustion engine activates an electric generator to extend the vehicle's range as necessary. During high-speed operation on gasoline, the engine may be mechanically linked to a generator set through a clutch, improving efficiency by 10% to 15%. The Volt's regenerative braking system also contributes to on-board electricity generation.

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Terminology

According to the Society of Automotive Engineers' (SAE) definition of a hybrid vehicle, they are characterized by the presence of "two or more energy storage systems, both of which must provide propulsion power, either together or independently". General Motors has refrained from using the term "hybrid" in reference to its Voltec designs, even following the disclosure that, in certain instances, the combustion engine offers assistance at very high speeds. This contribution from the gas engine is limited to high-speed scenarios, as during normal driving, there is no such facilitation, and the vehicle operates solely on electric power. General Motors instead describes the Volt as an electric vehicle equipped with a "range extender" gasoline-powered internal combustion engine (ICE) functioning as a genset and calls it an "extended range electric vehicle". In a January 2011 interview, Pamela Fletcher, the Global Chief Engineer of the Chevrolet Volt, described it as "an electric car with extended range". The Society of Automotive Engineers (SAE) states that the Volt qualifies as a plug-in hybrid vehicle due to its combination of an internal combustion engine, two electric motors, and a battery capable of accepting off-board energy. Functioning as a plug-in hybrid, the Volt can operate as a purely electric vehicle for the first 25 to 50 miles (40 to 80 km) in charge-depleting mode. When the battery capacity drops below a pre-established threshold from full charge, the vehicle enters charge-sustaining mode. In this mode, the Volt's control system selects the most efficient combination of its two electric motors—one powered by the propulsion system battery pack reserve and one by the combustion generator—to enhance performance and boost high-speed efficiency.

Design and development

=== Concept vehicle === The Chevrolet Volt concept car debuted at the January 2007 North American International Auto Show. The Volt concept featured a four-door layout with a rear liftgate and seating for four. This design contrasted with the former EV1 which seated two to minimize weight and accommodate its lead-acid battery pack. Top speed was increased on the Volt, from the electronically limited 80 miles per hour (130 km/h) to 101 miles per hour (160 km/h). Additionally, there was a reduction in battery size, from approximately 10.6 cubic feet (300 L) in volume, to 3.5 cubic feet (100 L) in the Volt. Led by then-vice-chairman for global product development at General Motors Robert Lutz, the Volt project sought to emulate the success of the Toyota Prius and become a leapfrog product like Apple's iPod. Inspired by the Tesla Roadster sports car and the rapid advances in lithium-ion battery technology, Lutz advocated for the development of a new car after the 2006 Detroit Auto Show despite internal opposition stemming from the billion-dollar loss experienced in the 1990s with the EV1. Lutz's initial idea was to develop an all-electric car. Still, when Jon Lauckner, General Motors vice president for global program management, briefly sketched out the powertrain layout, estimated the vehicle weight and battery requirements, he decided a range extender design was more appropriate. He convinced Lutz that adopting a smaller battery pack and a small combustion engine to drive a generator, serving as a range-extender, would address concerns related to expensive batteries, range anxiety, and the lack of public charging infrastructure, thereby circumventing the limitations observed in the EV1 program. The majority of the Volt's initial design parameters defined for the developm

Specifications

=== Drivetrain === The 2011 Chevrolet Volt featured a 16 kWh / 45 A·h (10.4 kWh usable) lithium-ion battery pack. It can be charged by connecting the car to a 120–240 VAC residential electrical outlet using the provided SAE J1772-compliant charging cord. The Volt is powered by an electric motor that has a peak output of 111 kW (149 hp) delivering 273 lb⋅ft (370 N⋅m) of torque. Capacity of the battery pack was increased to 16.5 kWh (10.9 kWh usable) for 2013 models, which enhanced its all-electric range from 35 to 38 mi (56 to 61 km). Upgrades for 2015 models included a larger battery capacity of 17.1 kWh. While driving, when the Volt's battery level diminishes to a predetermined threshold from full charge, a compact naturally aspirated 1.4-liter 4-cylinder gasoline fueled internal combustion engine (Opel's Family 0) with approximately 80 hp (60 kW), powers a 55 kW generator to extend the Volt's range. The vehicle also has a regenerative braking system. The electrical power from the generator is sent primarily to the electric motor, with the excess going to the batteries, depending on the state of charge (SOC) of the battery pack and the power demanded at the wheels. The drivetrain enables the Volt to operate as a pure battery electric vehicle until its battery capacity has been depleted to a defined level. At this time, it functions as a series hybrid, where the gasoline engine propels the generator, maintaining the battery at a minimum charge level and supplying power to the electric motors. The full charge of the battery is exclusively replenished by connecting it to the electrical grid. While in this series mode at higher speeds and loads, (typically above 30 miles per hour (48 km/h) at light to moderate loads) the gasoline engine can engage mechanically to the outp

Production and markets

=== North America === Assembly of the Volt was assigned to Detroit/Hamtramck Assembly plant following the UAW–GM conclusion of the 2007 contract negotiations. For the initial production phase, the gasoline engine was sourced from the Opel engine plant in Aspern, Austria. In November 2010, General Motors began investing US$138.3 million at its engine operations plant in Flint, Michigan, to support increased production of the Ecotec 1.4-liter engine used in the Chevrolet Cruze, the upcoming 2012 Chevrolet Sonic, and the variant used in the Chevrolet Volt. The Flint plant was projected to commence production at a rate of 400 engines per day in early 2011, escalating to 800 engines daily by late 2011, and ultimately reaching a capacity of 1,200 engines per day by late 2012. In May 2011, an additional investment of US$84 million at the Flint plant was decided upon by General Motors to further increase the production capacity of the 1.4-liter engine. In 2010, General Motors initially planned to produce 10,000 Volts in the calendar year 2011 and 45,000 units for 2012, surpassing the initially announced 30,000 units. In May 2011, the production targets were revised upwards, with Volt and Ampera production capacity increased to 16,000 units in 2011, including 3,500 units for export, 2,500 demonstration units for U.S. dealerships, and the remainder for U.S. sales. However, in November 2011 GM's sales chief announced that they would not meet its sales goal of 10,000 vehicles in 2011. Out of the 2012 production, General Motors anticipated the production of 10,000 Amperas for sale in Europe, with 6,000 allocated for Opel and 4,000 for Vauxhall in the UK. Additionally, 2,000 Volts were designated for the region. However, by early 2012, GM abandoned its sales target to deliver 45,000

Controversies and criticism

=== EPA fuel economy testing === In 2008, General Motors expressed concerns regarding the United States Environmental Protection Agency (EPA) testing procedures for the Volt's official fuel economy rating. The focal point of the controversy revolved around whether the inclusion of a gasoline engine should categorize the Volt as a hybrid electric vehicle rather than an electric car, as asserted by General Motors. If subjected to the same EPA tests applied to other hybrids, the Volt's EPA fuel economy rating would be about 48 mpg‑US (4.9 L/100 km; 58 mpg‑imp) due to the EPA test for hybrids, prohibiting vehicles from boosting their mpg rating using stored battery power. General Motors argued that the Volt was an entirely new vehicle type not adequately assessed by the EPA's existing fuel economy tests. They advocated for the creation of a new test tailored to the emerging class of hybrid-electrics. General Motors also advocated for a more simplified mpg calculation method to take into account the range of a plug-in hybrid while running solely on electricity. Given the Volt's ability to travel 40 miles (64 km) on batteries alone, GM contended that most drivers with a daily commute of less than that distance would exclusively use electric mode provided they recharged their vehicle at work or home overnight. In November 2010, the EPA issued an official rating that included separate fuel economy ratings for the Volt's all-electric and gasoline-only modes. The overall combined city/highway gasoline-electricity fuel economy rating was stated as 60 mpg‑US (3.9 L/100 km; 72 mpg‑imp) equivalent (MPG-e). To address the fuel economy variability based on miles driven between charges, the EPA incorporated a table on the Volt's fuel economy label, showing fuel economy and electricity c

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US EPA fuel-economy records

US EPA test figures (US MPG, US test cycle).

Sources

• Wikidata — https://www.wikidata.org/wiki/Q124572479CC0 1.0 · retrieved 2026-10-01
• Wikipedia — https://en.wikipedia.org/wiki/Chevrolet_Volt_(first_generation)CC BY-SA 4.0 · Text © Wikipedia contributors; revision 1357052228 · retrieved 2026-10-01
• Wikimedia Commons — https://commons.wikimedia.org/wiki/File:2011_Chevrolet_Volt_--_05-03-2011.jpgPublic domain · Photo: IFCAR · retrieved 2026-10-01
• Car Model Index — https://models.autoculturesociety.com/Compiled record. Sources that do not permit reuse are not copied; this index is credited instead.

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