What's inside the BYD DM Hybrid System (BYD Shark BYD Sealion 6)

in my last video I explained in plain English how the DMO platform works on the soon to be release bwy shark here in Australia a comment section lit up with interest so I thought why not dive deeper So today we're going to take a more in-depth technical look at the mechanics of byd's dual mode hybrid system and how am I going to show this to you the best way I know how with basic animated diagrams that look like I made them in Microsoft Paint that are more on this episode of Beyond your home for everything

be [Music] W hi everyone David here from Beyond EV and in this episode we're taking a technical Deep dive into the mechanics of byd's EHS transmission system this system is the PowerHouse behind Distributing energy from both the battery and the engine to the wheels in byd hybrid vehicles but before we start just a quick reminder Beyond V memberships are now live starting at just $3 a month so if you want to support the channel click the join button below for more info also the Beyond DV store is also open with Shirts Mugs stubby holders just

about everything you can think of that I can slap a logo on and just about the store I just wanted to give a quick shout out to a viewer in Texas who bought a Beyond EV t-shirt this week and left this kind message for for the channel it's actually amazing to me to think that someone in Texas is walking around in a Beyond d v t-shirt I won't name names but you know who you are buddy your support is much appreciated thank you very much mate now let's take a closer look at how byd's hybrid

system actually works the connection point between the engine and the electric Drive Motors is called the e HS Transmission auto electric hybrid system transmission I should mention that the EHS Transmission in both the DMO platform of the shark and the DMI platform of the cine 6 are very similar the main difference is the DMO platform on the shark is mounted longitudinally front to back down the chassis while the DMI platform is mounted transversely right to left across the chassis there are similar systems made by other manufacturers but byd has mentioned that the DMO platform is

actually the world's first longitudinally mounted EHS system of its kind now I'm going to pause the video here and give you a closer look at what we're actually going to look at this coupling Point here is where the electric motors and the engine made up this is the EHS transmission this is the mechanical part of the drivetrain that is responsible for deciding what is pairing the wheels either electricity from the battery petrol from the engine or both now what I've done is put together a number of 2D diagrams of a cross-section of this transmission and

I'm going to show you you the different flows of power and how they mechanically get to the wheels from both the engine and the battery in all the different modes that are available I'm going to use the byd Sharks DMO hybrid system for this example but just know that this layout would also work for the byd cine 6 DMI hybrid as well so let's go through the different components what you see here is essentially a layout of a byd EHS transmission if you were to decouple the engine from the electric motors the layout of the

gears inside that transmission are actually pretty close to what you're looking at here in both size scale and layout it is made up of four main gears which are used to power a differential that drives the axle it was hard to illustrate the axle going through the differential in this diagram so I just Illustrated that connection with a black line connecting the differential and the axle but just know in real life that axle would be going through that differential at the top and bottom you see the power inputs the 30 KW lfp blade battery at

the top and the 1.5 L turbo engine at the bottom the the 1.5 L turbo engine supplies power directly to the large brown coog it is the largest gear in the transmission there are no planetary gear sets and all the engine does is drive that one Brown Gear this is what makes it a one-speed transmission in the upcoming diagrams you will see the brown Cog move when it's decoupled from the intermittent shaft but just note in the actual transmission the brown Cog is stationary and it doesn't move at all the brown key is operated by

clutch when the clutch is engaged it's decoupled from the the drive line but when it's released it supplies power to the intermittent shaft in my diagrams I just move the engine gear away a little bit to the side just to illustrate this clutch mechanism and how it works there are two electric motors connected to this transmission a P1 electric generator motor Illustrated in red and a P3 Drive motor Illustrated in blue the P1 electric generator motor is driven by the big brown Cog which is powered by the engine when driven this generator generates electricity which

is stored in the lfp blade battery the P3 electric Drive motor supplies power into the transmission directly from either the lfp blade battery or through Power generated by the P1 electric generator motor in series mode when driven this is the motor that supplies power to the wheels in between all these gears is a gray countershaft but I believe bwy refers to this as an intermitted shaft this is responsible for combining power from both the engine and the electric Drive motor when in hybrid mode this transmission is able to the wheels four different ways or in

four different modes and I'm going to show you an animated diagram of each mode to illustrate how power is distributed in each mode the first mode is EV mode in this mode the engine is decoupled from the intermittent shaft and 100% of the power is provided by the P3 electric Drive motor which supplies power directly from the battery this is the default state of operation for byd's DM platforms and is used in all situations provided you have at least 20% battery state of charge the second mode is fuel mode now this mode might actually be

programmed out of most vehicles but it is mechanically possible on the DM drivetrain in this mode both the P1 generator motor and P3 Drive motor are decoupled from the drive line and the petrol engine supplies 100% of the power to the axle through the intermittent shaft like I said it is mechanically possible but this mode will most likely be programmed out of most Vehicles so you will never actually use it not that you'd really want to anyway because it would be like driving around in fourth gear all the time in a car that's capable of

being driven by an electric motor the third mode is series mode in this mode the petrol engine is decoupled from the intermittent shaft but operates to power the P1 electric generator motor which then generates electricity to supply charge to the battery as well as power the electric Drive motor this is the power generation mode of the DM platform the car will feel like you were driving an EV but the range of the battery will be exended by the petrol engine constantly supplying charge of the battery this mode is used when you've hit your predetermined save

state which by default is 20% this is also the mode the car shifts to when driving over 70 km hour the fourth mode is parallel mode in this mode the petrol engine is decoupled from the P1 electric generator motor and Supply supplementing power to the countershaft which is primarily driven by the electric Drive motor in this mode both the electric Drive motor and the petrol engine both provide power directly to the wheels at the same time parallel to each other this situation is used in high acceleration situations the P3 Drive motor will be the primary

driver of the counter shaft but the use of the petrol engine will help ease resistance of the countershaft against the drive motor therefore providing faster acceleration so there you have it a mechanical look at how byd's dual mode Hy system works from a technical perspective while other hybrid systems operate in a similar fashion most are limited to maybe two or possibly three of these modes as far as I'm aware B is the first to introduce all four separate modes as a capability through the one hybrid system but I could be wrong if you know a

bit more about some of these other systems that are similar let me know down in the comments I'm always Keen to expand my knowledge and everyone's input is always appreciated and if you like this video please give give it a thumbs up and if you enjoyed this content please consider subscribing to the channel we've got plenty more B related content headed your way that's it for now thanks for watching and I'll see you in the next one [Music]