Battery current in your Prius?

did it change before/after the update?

 

I see about the same peak regeneration currents. Not sure about currents under the other conditions listed; I tend to avoid those situations.

Who can explain why the traction battery current, according to my ScanGauge, jumps around a lot even while the HSI is steady, especially when the car is moving? Maybe some sort of mismatch of sampling rates, update frequency, ripple currents, etc.?

 

The ECU update reduced the ramp rate of current, or rate-of-rise, in order to reduce heat stress on the inverter power components. Unless you occasionally floor the accelerator, or accelerate quickly, like when entering an on ramp or speeding up quickly to change lanes, you probably will not notice the difference.

Before the update MG2 would accelerate quickly. Now there is a pause when you first press the accelerator but it will eventually get up to speed as the current is ramped up. If you are used to the fast acceleration, the first time you try it after the update the definite pause will catch you by surprise.

The Prius tries to keep the ICE at its most efficient sweet spot and uses MG2 to vary wheel torque for small changes. That is why you see the current varying all of the time with the ScanGauge. You will also notice that it is switching from positive, flow from the battery to MG2, and then negative, regen from MG2 to the battery.

 

Is this an XGauge add-on, with the ScanGauge?