What Is BMW 48V Mild Hybrid System?

Continuous technological advancements are made to combustion engines, which improves their efficiency at all speeds and under all usage scenarios. Fuel usage and exhaust emissions are also being reduced at the same time. In addition to bigger batteries for electric and plug-in hybrid models, a cutting-edge technology that boosts the efficiency of “conventional” automobiles has also been presented. The name of this technique is “Mild Hybrid.”

This innovation involves adding a 48 volt starter generator to the car, together with a correspondingly larger battery, to increase the vehicle’s economy and dynamics. The BMW 520d was the vehicle that initially featured BMW’s Mild Hybrid technology in the fall of 2019.

It was incorporated earlier this year into the 3 Series, X3 and X4 models, all of which employ the same 190 HP BMW TwinPower four-cylinder diesel engine. The BMW m340d and BMW X5/X6 xDrive40d are two examples of the BMW TwinPower inline-six Diesel cars that now provide it. The following BMW M440i xDrive will employ the same technology as well.

By utilizing the energy recovered during braking to not only power the electrical devices but also to generate more power, the Mild Hybrid technology was introduced, allowing the engine to operate more smoothly. The new diesel models’ 48 V starting generator adds an additional 8 kW/11 hp of electric power. Both the power delivered in the event of a severe acceleration and the efficiency at constant speed are increased by the additional electrical power.

An additional 48 V battery, which is charged by recapturing energy when braking, for example, houses the electricity.

This electric boost can be utilized to help the internal combustion engine while driving normally, enabling it to, for instance, lessen the despised turbo delay. Additionally, the 48 V generator enables the car to start and stop the engine more swiftly and quietly than previously, thus enhancing start-stop capability.

The combustion engine can be turned off while the car is gently decelerating so that the electric generator takes its place.

BMW adds 51 new cars with 48V mild hybrid technology.

BMW will add 37 new cars that use mild hybrid electrification starting in the summer of 2020. 51 models will now be available that are equipped with conventional 48-volt starter-generators. The mild hybrid technology is particularly helpful since it enhances the performance of the powertrain, offers a power boost when necessary, and supports the burden of the engine in various circumstances.

In the Fall of 2019, the 520d 4-cylinder diesel engine of the pre-LCI 5 Series model became the first to provide the 48V mild hybrid powertrain. The 3 Series and a few X models eventually benefited from the new technology in late 2019.

The 48-volt option will now be added to an additional 37 vehicles starting in July and August 2020, increasing the total number of mild hybrid-equipped cars in the lineup to at least 51 different types.

A number of new 3 Series models, new 5 Series and 6 Series GT facelift generations, 7 Series, as well as the high-riding X3, X4, X5, X6 and X7 Sports Activity models are among the vehicles slated to receive the mild hybrid technology.

The 48V mild hybrid unit depends on vigorous brake energy recovery, which is kept in a separate battery module created specifically for this use. The starting generator serves as a source of necessary energy for the car’s electrically powered systems.

Additionally, it adds more motor power by using the energy that is recovered during braking. Electricity from the extra battery must flow back to the starter generator for this to occur.

The 48-volt mild hybrid unit serves as an electric drive in the new drivetrain. The starter-additional generator’s boost reduces the physical strain on the engine and enables it to operate for the majority of the time in an efficient workload state.

The 48V electrical unit’s dynamic power supply, which measures 8 kW / 11 PS (10 hp), is especially helpful when the car is starting and accelerating.

What is a mild hybrid vehicle, and what does 48V mean?

A vehicle having an internal combustion engine and a minor electric motor is referred to as a mild hybrid. In order to lower overall fuel usage, the electric motor recovers braking energy (“recuperation”) and makes it later available as additional drive power. A mild hybrid vehicle can only be driven partially in pure electric mode, in contrast to a full hybrid or an electric vehicle.

Additionally, some 12V mild hybrids exist. Thus, a stronger 48V machine is typically employed, which recovers more energy and thereby reduces fuel use to a greater extent. As a result, professionals frequently use the words “48V” and “mild hybrid” interchangeably.

The definition of a mild hybrid can be found here.

It is helpful to comprehend the idea of a “mild hybrid” in order to understand BMW eBoost. In the automotive industry, a mild hybrid powertrain functions primarily as a regular gasoline or diesel-powered car, with the addition of a relatively small, low-horsepower electric motor in some circumstances.

Of course, an electric motor is used to start all contemporary ICEs. In the first place, ICE cars were made practical for widespread usage by that century-old invention. It isn’t a huge leap to use the starter motor that every ICE vehicle has in some situations to enhance power and torque.

The early mild-hybrid vehicles used the 12-volt electrical system, which has been the norm in the industry since the 1950s, and frequently used a starter motor that was a little more powerful to add a tiny amount of horsepower in particular short-term conditions like accelerating from a stop. This had certain advantages, but the small, 12-volt motor constrained the power increase (” boost”).

Leading the charge in developing 48-volt electrical systems, which had the advantage of providing greater power, were BMW and other European automakers. This not only enables them to deliver more acceleration, but it also speeds up starting in the modern ICE automobiles’ nearly universal automatic engine stop/start systems.

The BMW mild hybrid system’s inbuilt storage battery receives power from two sources. In the course of regular vehicle operation, the starter-generator produces some electricity. When the car brakes, regenerative braking catches additional energy (decelerates). The 48-volt battery in the car receives electricity from a regenerative braking system.

What is the BMW 48V mild hybrid?

It functions by recapturing energy lost while braking and using it to generate additional power. Therefore, the MHT can offer that extra boost of acceleration when needed. Stopping and restarting the engine has another performance benefit. Both actions are carried out more smoothly.

Additionally, there are financial advantages because MHT lowers CO2 emissions from the vehicle while it is in motion. Compared to a petrol or diesel model lacking such equipment, a mild hybrid car is more environmentally friendly.

48V mild hybrid: what is it?

The term “mild hybrids” normally refers to automobiles with at least one 48-volt (48V) electric motor that supports an ICE and a 48V battery that is charged by an electric generator that captures extra mechanical energy. Both gasoline and diesel engines can be coupled with mild hybrid technology; however, diesel mild hybrids are only used in Europe.

Are mild hybrids preferable to full hybrids?

Internal combustion engines and electric motors are used in tandem to power all hybrid vehicles. The fundamental advantage of Toyota’s full hybrid vehicles over mild hybrids is that their two power sources work completely independently of one another.

Mild hybrid vehicles cannot drive alone; instead, they rely on their electric motors to assist the engine while accelerating and cruising. In a fully charged or self-charging Toyota Hybrid, you may travel up to 50% of the distance in cities on pure electric power while traveling at speeds up to 50 km/h. The gasoline engine and electric motors work together to offer you a powerful burst of power while traveling at higher speeds or when passing another vehicle on the highway.

Do you still have concerns about the distinction between a full and mild hybrid? Pick out the answers to some more frequently asked hybrid questions below, or use our selection to find the ideal hybrid for you.

Mild hybrids are they automatic?

By lessening the effort that the petrol or diesel engine must do, a small electric motor helps the engine. A mild hybrid’s electric motor, in contrast to a standard or plug-in hybrid car, cannot drive the vehicle itself; instead, the petrol or diesel engine will always drive the wheels.

Additionally, because there is no electric motor powering the wheels, mild hybrids operate flawlessly with manual transmissions. Only automatic transmissions are available with full or plug-in hybrid vehicles.

A mild hybrid vehicle’s battery can only be charged while it is being driven, unlike a plug-in hybrid or a completely electric vehicle, which may be charged from an external power source. Some automakers call this “self-charging,” but that’s simply marketing speak and is deceptive.

Mild hybrids: do they save fuel?

A mild hybrid vehicle can be a wonderful option for you, depending on your goals. They have lower emissions and improved fuel efficiency. Even if it won’t have zero emissions like an electric car or even a full hybrid, it’s still an improvement over a typical car.

Many people may believe that mild hybrids allow for a smoother drive, where the engine is noticeably working less during strong acceleration, because the batteries can also result in increased torque when driving.

What distinguishes a hybrid from a mild hybrid?

A mild hybrid is essentially just a regular gasoline or diesel engine with an electric motor that normally powers electrical components like the air conditioner and the radio and a low voltage (48V) battery. They can supplement the engine with a tiny electric boost during acceleration at low engine speeds, but unlike full hybrids, they are unable to run completely on electric power and cannot operate in zero-emission mode.

A mild hybrid cannot function on pure battery alone and so offers significantly fewer benefits than a full hybrid. In contrast, a full hybrid can drive on battery power alone and operate in a fuel-efficient, zero-emissions mode up to 62% of the time on average (thanks to its large battery).