A 48-volt DC electrical system voltage is a relatively low-voltage electrical system that is increasingly used in vehicles. It began in the 2010s as a way to increase the propulsion and battery recharge during braking for fuel savings in internal combustion engine vehicles, especially mild hybrid vehicles. [1]
Traditionally, vehicle low voltage applications were powered by a 12-volt system. In the 1990s, an attempt by a cross-industry standards group to specify a 42-volt electrical system failed to catch on and was abandoned by 2009. [2] During the 2010s, renewed interest arose for a 48-volt low-voltage standard for powering automotive electronics, especially in hybrid vehicles. [3]
In 2011, German car manufacturers Audi, BMW, Daimler Benz, Porsche, and Volkswagen [4] agreed on a 48V system supplementing the existing 12V network. [5]
In model year 2017, the Renault Scenic dCi Hybrid Assist was the first 48V mild-hybrid passenger car.
As of 2018, a 48V electrical subsystem operated production vehicles such as Porsche and Bentley SUVs. Audi and Mercedes-Benz used a 48V subsystem in 2018 vehicles such as A6, A7, A8 with 3.0 TDI 48V mild-hybrid, CLS, E-Class, S-Class with M256 3.0 Turbo Otto 48V Mild-Hybrid. [6]
Hyundai Tucson, Hyundai Santa Fe, Kia Ceed and Kia Sportage followed in model year 2019 with 1.6 and 2.0 turbodiesel engines supported by 48V mild-hybrid technology.
A European automotive trade association, CLEPA, estimated in 2018 that as many as 1 of every 10 new vehicles in 2025 would use at least one 48 volt device in the vehicle, covering 15 million vehicles per year. [7]
In March 2023, Tesla Inc. revealed that the Tesla Cybertruck and next-generation vehicle would utilize a 48-volt mid-voltage subsystem as a replacement of 12V system, migrating the low-voltage components with highest power demand to 48V. [8]
In December 2023, in order to accelerate the adoption by other automakers of 48 V system voltage for automotive components, Tesla offered a "48-volt electrical system whitepaper"
to all industry leaders. CEO Jim Farley confirmed that Ford had received a copy and agreed to 'help the supply base move into the 48-volt future". [9] Tesla adopted 48 volts for its Optimus robot. [9]
A 48V system can provide more power, improve energy recuperation, [7] and allow up to an 85% decrease in cable mass. [10]
12-volt systems can provide only 3.5 kilowatts, while a 48 V power could achieve 15 to 20 kW or even 50 kW. 48 volts is below the level that is considered safe without special protective measures. [11]
Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.
A hybrid vehicle is one that uses two or more distinct types of power, such as submarines that use diesel when surfaced and batteries when submerged. Other means to store energy include pressurized fluid in hydraulic hybrids.
An electric vehicle (EV) is a vehicle that uses one or more electric motors for propulsion. It can be powered by a collector system, with electricity from extravehicular sources, or it can be powered autonomously by a battery. EVs include but are not limited to road and rail vehicles, and broadly can also include electric boat and underwater vessels, electric aircraft and electric spacecraft.
A jump start, also called a boost, is a procedure of starting a motor vehicle that has a discharged battery. A temporary connection is made to the battery of another vehicle, or to some other external power source. The external supply of electricity recharges the disabled vehicle's battery and provides some of the power needed to crank the engine. Once the vehicle has been started, its normal charging system will recharge, so the auxiliary source can be removed. If the vehicle charging system is functional, leaving the engine running will restore the charge of the battery.
Automobile accessory power can be transferred by several different means. However, it is always ultimately derived from the automobile's internal combustion engine, battery, or other "prime mover" source of energy. The advent of high-powered batteries in hybrid and all-electrical vehicles is shifting the balance of technologies even further in the direction of electrically powered accessories.
An automotive battery, or car battery, is a rechargeable battery that is used to start a motor vehicle. Its main purpose is to provide an electric current to the electric-powered starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle. Once the engine is running, power for the car's electrical systems is still supplied by the battery, with the alternator charging the battery as demands increase or decrease.
Hybrid Synergy Drive (HSD), also known as Toyota Hybrid System II, is the brand name of Toyota Motor Corporation for the hybrid car drive train technology used in vehicles with the Toyota and Lexus marques. First introduced on the Prius, the technology is an option on several other Toyota and Lexus vehicles and has been adapted for the electric drive system of the hydrogen-powered Mirai, and for a plug-in hybrid version of the Prius. Previously, Toyota also licensed its HSD technology to Nissan for use in its Nissan Altima Hybrid. Its parts supplier Aisin Seiki Co. offers similar hybrid transmissions to other car companies.
BAS is a category of automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine's crankshaft via a serpentine belt. By mounting this motor generator unit in the conventional location traditionally used for the standard automotive alternator, it permits a low-cost method of adding mild hybrid capabilities such as start-stop, power assist, and mild levels of regenerative braking. BAS systems differ from other mild hybrid systems as they are not run off the vehicle's crankshaft.
Mild hybrids (MHEV) are generally cars with an internal combustion engine (ICE) equipped with a negligibly bigger electric combined motor and generator in a parallel hybrid configuration allowing the engine to be turned off whenever the car is coasting, braking, or stopped, and then quickly restarted once power is again required. Mild hybrids may employ regenerative braking and some level of power assist to the internal combustion engine, but mild hybrids do not have an electric-only mode of propulsion.
Hybrid vehicle drivetrains transmit power to the driving wheels for hybrid vehicles. A hybrid vehicle has multiple forms of motive power.
The Chevrolet Volt is a plug-in hybrid car manufactured by General Motors, also marketed in rebadged variants as the Holden Volt in Australia and New Zealand and the Buick Velite 5 in China, and with a different fascia as the Vauxhall Ampera in the United Kingdom and as the Opel Ampera in the remainder of Europe. Volt production ended in February 2019.
An automobile auxiliary power outlet in an automobile was initially designed to power an electrically heated cigarette lighter, but became a de facto standard DC connector to supply electrical power for portable accessories used in or near an automobile directly from the vehicle's electrical system. Such include mobile phone chargers, cooling fans, portable fridges, electric air pumps, and power inverters.
The Dräxlmaier Group is a globally operating automotive supplier with its headquarters in the Lower Bavarian city of Vilsbiburg, Germany. Founded in 1958, the family-owned company specializes in the production of wiring harness systems, central electrical and electronic components, interiors, and low- and high-voltage battery systems for electric mobility for premium vehicles.
An electric car or electric vehicle (EV) is a passenger automobile that is propelled by an electric traction motor, using only energy stored in on-board batteries. Compared to conventional internal combustion engine (ICE) vehicles, electric cars are quieter, more responsive, have superior energy conversion efficiency and no exhaust emissions and lower overall vehicle emissions. The term "electric car" normally refers to plug-in electric vehicle, typically a battery electric vehicle (BEV), but broadly may also include plug-in hybrid electric vehicle (PHEV), range-extended electric vehicle (REEV) and fuel cell electric vehicle (FCEV).
Automotive electronics are electronic systems used in vehicles, including engine management, ignition, radio, carputers, telematics, in-car entertainment systems, and others. Ignition, engine and transmission electronics are also found in trucks, motorcycles, off-road vehicles, and other internal combustion powered machinery such as forklifts, tractors and excavators. Related elements for control of relevant electrical systems are also found on hybrid vehicles and electric cars.
In automobiles, a 42-volt electrical system was an electrical power standard proposed in the late 1990s. It was intended to facilitate increasingly-powerful electrically-driven accessories in automobiles, and lighter wiring harnesses. Electric motors were proposed to be used for power steering or other systems, providing more compact installations and eliminating the weight of drive belts or large wires for high-current loads.
Karma Automotive is a Chinese-owned American producer of luxury electric vehicles founded in 2014. Headquartered in Irvine, California, United States with an assembly plant located in Moreno Valley, Karma sells vehicles via its dealer network of locations in North America, Europe, South America, and the Middle East.
The Ingenium family is a range of modular engines produced by Jaguar Land Rover, in both petrol and diesel variants. It uses a modular architecture making it possible to be produced in three-, four- and six-cylinder versions, depending on demand and requirements. The engines sourced from Ford were replaced by engines from Jaguar Land Rover's new Ingenium engine line from late 2015.
The Tesla Cybertruck is a battery electric full-size pickup truck built by Tesla, Inc. since 2023. Introduced as a concept vehicle in November 2019, it has a triangular body design with flat sheet metal panels made of stainless steel.
Vitesco Technologies Group AG, headquartered in Regensburg, is a German automotive supplier for drivetrain and powertrain technologies. Vitesco Technologies was a business area of Continental AG until it became independent in September 2021. The company develops devices for electric vehicles as well as internal combustion engines.