Developments with Mild Hybrids |
Friday, May 31st 2019
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Developments with Mild Hybrids

News from Moditech Rescue Solutions BV

In the March 2018 newsletter, we discussed the technology behind the Mild Hybrid System. However, there are more and more vehicles on the road that are equipped with this technology. Reason enough for us to take another close look at the developments.

More on this topic in this month’s newsletter!


When we informed you about the Mild Hybrid technology more than a year ago, there were only a few models available such as the Audi A8, Suzuki Swift, Baleno, Renault Scenic and Grand Scenic. Nowadays, many more models have been fitted with this 48 V system and this will only increase in the future.

In brief, a Mild Hybrid System consists of a 48 V battery, a DC/DC converter and a 48 V dynamo that acts as a starter and generator. The power from the battery supports the engine via the dynamo during acceleration. This reduces the consumption of the engine. During deceleration, the braking energy is conducted via the dynamo (which then acts as a generator) to the 48 V [sic: battery], whereby this recharges. When the car is stationary or driving slowly, the 48 V system can take over the drive and support the 12 V circuit power supply. 


In the examples below, we will go through different forms of a Mild Hybrid System layout. ATTENTION: It is striking that the layout differs per manufacturer, but the models also differ in terms of layout and the location of the battery.

Audi A6, A7 and A8:
With this 48 V system, we can see both batteries and the DC/DC converter at the back of the car.

Audi A4, A5 and Q5:
This system has a similar system layout as in the A6, A7 and A8 but the starter/generator dynamo is supported by a 12 V instead of a 48 V battery. Of course, this means that the support is less powerful.

The Audi A6 and A7 with 4-cylinder engines also have this 12 V Mild Hybrid System. In this layout, the 12 V Mild Hybrid battery has been moved to the engine compartment as can be seen in the Crash Recovery System image:


The Volvo XC90 and XC60:
Volvo will deliver the XC90 B5 and XC60 B4 models this month. These have a 2.0 diesel engine with Mild Hybrid technology, whereby both batteries are located in the boot.


Hyundai / Kia:
Hyundai and Kia are supplying a Mild Hybrid System with the Tucson and Sportage whereby the 12 V battery is in the engine compartment and the 48 V battery is in the boot.


Mercedes-Benz also has various models equipped with Mild Hybrid technology including the CLSS-Class and E-Class CoupeATTENTION: If we take the E-Class Coupe as an example, we see that in the versions without a Mild Hybrid System, the 12 V battery is located in the engine compartment. With the Mild Hybrid version, the 48 V [sic: battery] is at this location and the 12 V battery is placed in the boot.


Mazda also supplies a Mild Hybrid System with the new Mazda 3 hatchback and sedan. Mazda has chosen to mount the Mild Hybrid battery on the right-hand side under the car. ATTIONTION: This system is different in that it has a 24 V Mild Hybrid battery instead of the standard 48 V. The new CX-30 will also get this system.


In the short term, many more models equipped with a Mild Hybrid system will follow. The expectation is that every new model will have a Mild Hybrid variant. Mild Hybrid is a relatively simple way for manufacturers to reduce fuel consumption and emissions in order to meet increasingly strict emission standards. Below are some more examples of future models.

This year, Ford will introduce the first Mild Hybrid version of the new Ford Transit. Next year, the Ford Fiesta, Focus, Transit Connect and Custom models will follow.

Land Rover:
Land Rover will deliver its first Mild Hybrid technology in the Range Rover Evoque whereby the Mild Hybrid battery and DC-DC converter have been combined and fitted under the car.

And finally Volkswagen. The new generation Golf 8 will also get a Mild Hybrid System. One would expect that this system would be the same as that of Audi, but that isn’t the case. Volkswagen opts for a system whereby the Mild Hybrid battery is located under the passenger seat.


The above shows that the Mild Hybrid System is implemented differently by almost all manufacturers and placed at different locations. For the emergency services, it is, therefore, very important to know where which component is located in a vehicle! In the most recent database of May 2019, we added some of the vehicles above. The future models will follow soon.

CAUTION: Even though the second power supply is not connected to the SRS system, it must still be disconnected to make the vehicle completely unpowered. If it is not possible to disconnect the battery, it is essential to take this into account when working on the vehicle. You can find this information in the Crash Recovery System!

When 'Mild Hybrid' vehicles are run through a license plate inquiry (RDW Edition), you will see that they are registered as Petrol/Electric vehicles. This can cause confusion for the first responder because this is not a fully-fledged drive such as with 'hybrid' or 'plug-in hybrid' vehicles. This is the result of how the vehicles are registered in the vehicle registry. It is important in this situation that the first responder takes in the information provided by the Crash Recovery System before he/she takes action. Crash Recovery System, Know what's inside!