Rogue Toad
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For those who haven't seen it yet, in this video a Chrysler engineer explains what eTorque is, how it works, and what it does. I found it really helpful, so figured I would share.
This is in a Ram 1500, but it's basically the same system as in the Wrangler. Since Jeep doesn't really explain it well in their marketing, it can be easily confused with ESS (electronic start-stop). eTorque is a belt starter-generator and is used for more than just the engine start-stop function.
A quick summary of the 6 functions of eTorque:
1. Stop-Start: Unlike ESS, which uses the starter and is much more noticeable, eTorque uses the 48V battery and belt starter generator (BSG) to restart the engine within 400ms. Saves gas when at stop lights, etc. (I can verify that it's very seamless. The thing you notice most is just the lack of engine NVH when it stops.)
2. eRoll Assist: when starting to move, eTorque adds power for approximately the first half tire rotation to give the engine a "boost" down at inefficient low engine revs to get the vehicle moving.
3. Upshift Rev Matching: when the engine needs to upshift, eTorque scrubs off engine speed to rev match for a smooth shift, and stores that energy in the 48V battery instead of using the transmission clutches to scrub off that speed.
4. Electronic System power: the 48V battery is used to power the vehicle electrical loads so that the engine doesn't have the extra parasitic loss.
5. Downshift Rev Matching: eTorque accelerates the engine for smooth shifts instead of having to use fuel.
6. Regenerative Braking: under coasting or normal braking conditions, eTorque puts a load on the engine and uses the BSG to store energy that would normally have to be absorbed by the brake pads.
This is in a Ram 1500, but it's basically the same system as in the Wrangler. Since Jeep doesn't really explain it well in their marketing, it can be easily confused with ESS (electronic start-stop). eTorque is a belt starter-generator and is used for more than just the engine start-stop function.
A quick summary of the 6 functions of eTorque:
1. Stop-Start: Unlike ESS, which uses the starter and is much more noticeable, eTorque uses the 48V battery and belt starter generator (BSG) to restart the engine within 400ms. Saves gas when at stop lights, etc. (I can verify that it's very seamless. The thing you notice most is just the lack of engine NVH when it stops.)
2. eRoll Assist: when starting to move, eTorque adds power for approximately the first half tire rotation to give the engine a "boost" down at inefficient low engine revs to get the vehicle moving.
3. Upshift Rev Matching: when the engine needs to upshift, eTorque scrubs off engine speed to rev match for a smooth shift, and stores that energy in the 48V battery instead of using the transmission clutches to scrub off that speed.
4. Electronic System power: the 48V battery is used to power the vehicle electrical loads so that the engine doesn't have the extra parasitic loss.
5. Downshift Rev Matching: eTorque accelerates the engine for smooth shifts instead of having to use fuel.
6. Regenerative Braking: under coasting or normal braking conditions, eTorque puts a load on the engine and uses the BSG to store energy that would normally have to be absorbed by the brake pads.
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