2 electric motors?

[rivermaverick]

The secret is not in understanding the two motor generators and an internal combustion engine, the secret is in understanding planetary gear sets. After watched numerous YouTube videos on planetary gear sets, I concluded, they are magic.

You are right, planetary gear sets are fascinating, you can get 7 different gears with a single gear set in a conventual transmission by applying clutch/brakes: to each of the 3 elements but the eCVT doesn't work like that:
Took me a while, the sun gear is coupled to MG1, the planet carrier is coupled to the ICE and the anulus is coupled to the wheels via MG2. So when the vehicle is stationary the anulus is fixed, when the ICE is off the planet carrier is stationary but the planet gears can still spin.
Not sure if this explains it or just confuses it.

Sponsored

 

[Criss944]

The secret is not in understanding the two motor generators and an internal combustion engine, the secret is in understanding planetary gear sets. After watched numerous YouTube videos on planetary gear sets, I concluded, they are magic.

Although planetary gear sets are magical, I have come to a basic understanding of how the Maverick hybrid works.

First, I think of the motor/generators by their primary function. The larger motor/generator is the drive motor. The smaller motor/generator is the starter motor.

Next a few thoughts about planetary gear sets. They have three input/outputs. If one input/outputs is turning, one or both of the other input/outputs must also be turning. All three input/outputs can turn in both directions. However, the planet carrier is prevented from turning the engine backward.

The three input/outputs are:
1) The sun gear which is connected to the starter/motor.
2) The planet gears which is connected to the engine.
3) The ring gear which is connected to the drive motor/generator and the wheels. If the wheels are turning the drive motor/generator is turning and vice versa.

When driving in full electric mode the drive motor is drawing electricity from the high voltage battery. Since the rule for planetary gear sets requires two input/outputs must be turning, the starter generator is generating electricity and sending it back to the high voltage battery. No, it is not perpetual motion. The traction motor is using much more power than the starter generator is producing.

When coasting or braking both the drive generator and the starter generator are producing electricity for the high voltage battery. This produces the regenerative braking.

If the high voltage battery cannot provide enough power, the starter motor starts the engine which can provide power to the wheels and/or the starter generator.

 

[Donald]

Look up CVT images on Google and you will see the Ford CVT and it shows 2 motors on it and one is probably a generator.

It’s actually an ECVT.

 

[Darnon]

While it mostly gets regarded as the starter/generator motor another critical function of that particular motor is it also controls the effective shaft ratio of the ICE to the wheels. When rotating counter to the ICE direction it is underdriving the output, it can "stop" and be 1:1, or it can rotate faster than the ICE and overdrive it. This is what effectively makes the design a[n e]CVT as the output in relation to the ICE input is constantly variable to a nearly infinite degree.

Sponsored