So, the hybrid Tundra doesn't have a starter, nor an alternator?

Reading this press release, if I understand correctly, the electric motor will spin and start the V6 engine as opposed to conventional 12-volt battery cranking the starter to get the motor started? If so, that's pretty cool.

Does that mean also the hybrid Tundra doesn't have an alternator anymore? Maybe the "big battery" under the seat can charge the 12-volt battery eliminating a belt-driven alternator?

 

According to this article, it does use the elec motor to start the truck but it also has a starter for cold starts. If it didn’t, you wouldn’t be able to start the truck to let it idle to warm up or for other reasons. Weather or not it has a 12v or uses the main batterys, I don’t know. No idea on the alternator.

https://www.google.com/amp/s/www.motortrend.com/features/2022-toyota-tundra-hybrid-tech-dive/amp/

 

thanks, I read the Toyota press release "...while the engine start-up, ... are solely done via the parallel hybrid components." I thought start-up means firing up the gasoline engine regardless whether it's a cold start or a "hot" startup in the auto start/stop event, but MotorTrend article makes it seem that cold start and auto start/stop are totally different things.

I could be wrong, but my understanding is that apart from requiring more energy to overcome cold and thick engine oil during cold start up, the physical nature to start the gasoline engine is the same (spin the engine crankshaft fast enough and with the correct timing of air, fuel, and spark, and you get a running gasoline engine). The electric motor is powerful enough to drive the truck, it should definitely have to power to rotate the crankshaft of a cold engine. Maybe I'm missing something here.

 

All Toyota hybrids don't use a starter motor. Hybrid motor is more powerful than a starter motor .

 

Yes it will probably use the hybrid motor to start while driving to use the auto start stop at red lights etc. I guess the starter would be used at times when you just wanted to crank the truck while sitting without having to drive foward with the big elec motor. Like in you garage or driveway.

 

If it’s setup like other hybrids there will be no alt. The 12v system will be fed 12v from the inverter system that does the a/c to DC conversion and vise versa for the battery and hybrid motor.
I doubt the hybrid has a conventional starter. The start stop being spoken of is on gas models. There’s probably a mixup on info in there. But there also not much stopping them from tossing a starter in either.

 

It is just like a Prius as far as engine starter and no the 'big' batter does not charge the 'small' battery, just like a Prius again....you're gonna learn a lot about a Prius in this process. Now for Toyota to make the really big leap to FULL ON ELECTRIC, when Toyota, WHEN???

 

The dc to dc converter in the inverter assembly does technically charge the 12v off the hybrid system

 

Will the main electric motor be able to start the engine while sitting still in nuetral or does it have to roll forward , sort of like jump starting? If so, there shouldn’t be a need for a starter.

 

Ofcourse lol

 

Yes. It’s got a clutch on it

 

Interesting. Gotta make that electricity somehow.

 

Hopefully there's a PTO so I can run my generator to charge the batteries...

 

so I’m a little lost here… will there be a 12v connection for hooking up aftermarket accessories (I.e. switch pros panel to run extra lights, air compressor, etc).

 

Yes there’s a regular 12v system in the truck for everything else.


Having 650v powering everything is asking for problems. The electric motor will charge the hybrid battery and the inverter that converts the motors AC to DC also has a DC to DC step down. For 12v system charging.

 

So if the hybrid battery is dead for some reason or some part of the hybrid system fails you have no way to start the your truck?

 

Hybrid battery’s closely monitored by the hybrid control ecu ad will “fail” well before it becomes undriveable. BUT NEVER RUN THE THING OUT OF GAS.

 

interesting question, I guess that's why, if there's indeed a 12 volt battery powered starter motor on the hybrid, just in case when the high voltage battery is dead to start the gasoline engine
the electric motor jammed between the gasoline engine and the transmission needs high voltage to work so a dead HV battery will not be able to start the engine.

On my old prius there's one time that my 12v is very low and it refused to start, I have yet to see the HV battery to be completely empty/dead at all

 

Yeah, but does it have a transmission cooler....Lol

 

Obviously I don't know about the Tundra Hybrid but on the Ram it uses the 12v battery and starter motor to start the truck . Once you're driving the Hybrid battery takes care of the auto start/stop function . On the Ram the engine will shut off when you come to a stop and as soon as you let off the brake the Hybrid battery starts the engine . As soon as you turn the truck off manually IE shut the ignition switch off you need the starter motor to start it back up .

 

I have a Lexus RX hybrid and can tell you that on that vehicle and I believe all the other Toyota hybrids, that the 12V battery is used only to power up the computers that control engine management, lights and accessories. The 288V hybrid battery pack powers the electric motor(s) that also start the engine. However, if the 12V battery is dead, the engine will not start because the engine control computers cannot power up.

 

This is exactly the case. 12v covers everything that isnt hybrid drivetrain.

 

E-CVT operation for a Toyota hybrid...

https://www.youtube.com/watch?v=O61WihMRdjM

 

So if you wanted to run a dual battery setup in a hybrid Tundra (such as a lithium battery for camping) could you still run a DC to DC charger from the truck's battery to charge the secondary battery?

 

It's all explained here:

https://www.youtube.com/watch?v=bkXiYiGWZnE

 

OK, so it DOES have a starter.