Is there a reliable way to calculate Hybrid Torque?

"KingT- 60% of the time, it works every time" (kngt) 06/11/2020 at 11:07 • Filed to: Hybrid, hybrids, torque

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I checked online couldn’t find anything concrete. Very few manufacturers state the torque. I think the Malibu has official numbers from Chevy for total torque. Acura has this for its RLX Hybrid with the following disclaimer- “Horsepower and torque figures includes the maximum power of the engine and all motors combined that can be produced at any one time. Not SAE net.”

I have seen mostly total system HP but not torque

I know that electric and gas engines make torque at different RPMs so how would you calculate total torque in this instance? Case in point the new Sonata-

2.0L Inline 4 cylinder-

150 hp @ 6,000 rpm

139 lbft. torque @ 5,000

Electric Motor-

Power Output 39 kW (51 HP) @ 1,800–2,300 rpm

Torque Output 151 lb.ft. @ 01,800 rpm

Combined Horsepower 192 hp

Combined Torque?

bob and john > KingT- 60% of the time, it works every time 06/11/2020 at 11:07

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Ver y easy way actually.

Stick the thing on a dyno and measure it. 

KingT- 60% of the time, it works every time > bob and john 06/11/2020 at 11:09

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Manufacturers Dyno test their vehicles I assume? Why don’t they release total torque numbers and only total HP?

bob and john > KingT- 60% of the time, it works every time 06/11/2020 at 11:13

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to make themselves look good.

bike manufactures almost NEVER release the HP or torque numbers at all. You have to search hard to find them

CaptDale - is secretly British > KingT- 60% of the time, it works every time 06/11/2020 at 11:14

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Because at least for most of the uneducated populace HP is synonymous with power and that is all that matters for sales paraphernalia.

MasterMario - Keeper of the V8s > KingT- 60% of the time, it works every time 06/11/2020 at 11:15

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You could do a very simplistic estimation using the assumption that the torque curve is flat on an electric motor

It would literally be additive to the gas engine torque curve then. Granted this is not going to be representative of reality without knowing the actual torque curve which is going to look something more like this

And we don’t know if engineers de-rate the electric motor so it doesn’t break anything in the transmission either.

gmporschenut also a fan of hondas > MasterMario - Keeper of the V8s 06/11/2020 at 11:21

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Model s is single speed  9.73:1

MasterMario - Keeper of the V8s > gmporschenut also a fan of hondas 06/11/2020 at 11:24

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I know, but I believe the electric motor torque curve would still look something more like this. Though it would have steps for each gear on a graph based on vehicle speed like this one . I am not an electrical engineer though, so take this with a grain of salt.

just-a-scratch > KingT- 60% of the time, it works every time 06/11/2020 at 11:28

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You can calculate such things for a hybrid, but you need a lot more info, and the calculation will be a bit different in method based on the hybrid drivetrain layout.

Arch Duke Maxyenko, Shit Talk Extraordinaire > KingT- 60% of the time, it works every time 06/11/2020 at 11:29

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Exage03040 @ opposite-lock.com > KingT- 60% of the time, it works every time 06/11/2020 at 18:28

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It can be estimated with those data points to develop the torque values of both the engine and the motor respective torque curves at given rpms. You’d do a rudimentary mock dynonplot with bhp=tq X @rpm / 5252 and line up the data points you can with peak torque motor, peak hp  motor, peak torque engine, peak hp engine and and educated solving of peak combined HP (an rpm would be more helpful but likely near peak engine hp just based on the performance of both engine and motor)

The peak value is where both both engine and motor combined together produce the highest torque value (it will also give you the engine rpm that occurs).

It won’t be 100% precise or accurate but you can ballpark it to be decently close.