Power Train Technical Stuff

Faults and Technical chat for the Kia Niro
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AlanHo
Posts: 85
Joined: Wed Nov 02, 2016 10:05 pm

Power Train Technical Stuff

Post by AlanHo » Tue Feb 28, 2017 10:58 pm

I have been scouring the web for more technical information about the Ioniq and Niro with some success. I found this info on a USA web site – hence economy is for US gallons,


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Engine Starter

A pulley on the end of the engine crankshaft connects the engine to a Hybrid Starter Generator (HSG) via a reinforced plastic belt which serves a dual role, unlike conventional cars which have a separate starter motor and alternator. It can potentially be part of the regenerative braking process and is used to start the engine when the car is stationery. On the move, the engine is bump started through the transmission. (I have seen another source claim that the engine is started by the starter motor and brought up to speed before engaging with the transmission via a clutch)
The drive belt has a service life of between 40,000 and 70,000 miles which varies with each market.


DCT 6 Speed Gearbox

Wear of the DCT clutch plates is minimised in two ways. There is no clutch action involved when starting from a stop. That's done by the electrical motor whilst the clutch is fully engaged in first gear. This is normally the main source of wear and the main source of annoyance with DCT transmission (the infamous slight shuddering feeling at low speeds). The DCT clutches are under very little stress because the electric motor is effectively a torque converter and always gets the car underway from stationary.

Any gear changes once driving should not put too much strain on the clutches because the engine isn't all that powerful and the ECU and gearbox controls try to match the speed of the engine to the speed of the input shaft of the gearbox to minimise wear, Hyundai/KIA have ensured this by adopting a powerful central processor that is fast enough to manage a quick and smooth clutch lockup. The lockup takes just 0.6 seconds.

Hybrid Battery

All three versions of the Niro will use lithium polymer batteries made by South Korean supplier LG Chemicals. KIA claim that the polymer structure is safer than the traditional lithium ion batteries used by some rivals.
This type of cell/battery scores high in max current (amps), safety (250oC thermal runaway - does not easily catch fire), life span (1000 - 2000 cycles), low cost to produce, and scores particularly well in capacity (how much power it will hold). They are good all round cells.
Currently March 2017 KIA Niro 2 Plus ADAP in Whte

M. Irvine.
Posts: 15
Joined: Sun Oct 16, 2016 1:59 pm

Re: Power Train Technical Stuff

Post by M. Irvine. » Thu Mar 02, 2017 5:10 pm

Very interesting.

NiNiro
Posts: 14
Joined: Sun Jun 18, 2017 6:02 am

Re: Power Train Technical Stuff

Post by NiNiro » Sun Jun 25, 2017 10:16 pm

Thanks AlanHo, This detail on the powertrain is very interesting and makes the driving experience all the more enjoyable when I have an understanding of the systems behind it. If you come across any information on the software side of the system it would be nice to learn about that as well.

I have looked about for technical data here in the UK but didn't find any.

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