What is the Integrated Starter Generator on a Mercedes?
The 2022 S 580 4Matic features an 8 cylinder internal combustion engine boosted with mild hybrid drive.
Mercedes-Benz debuted its EQ Boost system on the S-Class several years ago and has since applied the technology to many more models, from the GLS to the AMG lineup. EQ Boost is Mercedes’ patented mild hybrid system and gives the engine a boost in certain situations.
Mercedes had stated previously that they intended to electrify all vehicles by 2022, so we expect to see the EQ boost system on many more models by the end of this year.
The Difference Between Mild Hybrid and Full Hybrid
The EQ Boost system is classified as a mild hybrid system. Mild hybrid vehicles are also known as “power assist hybrids” or “battery-assisted hybrids.” Unlike a full hybrid, a mild hybrid electric motor is designed to kick in only when the car is cruising or braking.
Mild hybrid vehicles are not able to propel a car on their own, nor do they attain the same fuel economy as full hybrids. However, they still increase efficiency in a car by replacing the starter and alternator with one single element to assist the powertrain.
How Does EQ Boost Work?
EQ Boost pushes the mild hybrid system to function in many ways like a full hybrid.
The 48-volt system consists of two key elements: a rear-mounted 0.9-kWh lithium-ion battery and an Integrated Starter Generator (ISG). The ISG incorporates a starter, alternator, and electric motor in one, compact unit that fits neatly between the engine block and the transmission.
Effectively, the ISG functions as both a starter motor and a hybrid assist motor. It allows for additional horsepower to be sent to the engine in short bursts and re-distributes kinetic energy from braking and other operations.
Additionally, the ISG pairs with ECO-Mode to further improve efficiency and fuel economy. When the car is in ECO-Mode, the vehicle will shut off the powertrain and revert to electric power under certain driving conditions, such as when cruising or at a full stop.
The 48-volt system also serves to power lights, air conditioning, the water pump, and other auxiliary components. There is no need for a separate 12-volt battery, which increases space and reduces the probability of parasitic power loss.
Try EQ Boost at Mercedes-Benz of Littleton
EQ Boost is an excellent middle ground between full hybrids and gasoline-powered vehicles. The system is so unobtrusive that you likely won’t even notice when it kicks in, making it a great option for those who prefer driving gas-fueled cars but also want to be more sustainable and get better mileage.
Mercedes Benz of Littleton has a full inventory of cars equipped with EQ Boost. Stop by or go online today to see what we have in stock.
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